Commit | Line | Data |
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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * linux/lib/vsprintf.c | |
4 | * | |
5 | * Copyright (C) 1991, 1992 Linus Torvalds | |
6 | */ | |
7 | ||
8 | /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */ | |
9 | /* | |
10 | * Wirzenius wrote this portably, Torvalds fucked it up :-) | |
11 | */ | |
12 | ||
7b9186f5 | 13 | /* |
1da177e4 LT |
14 | * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com> |
15 | * - changed to provide snprintf and vsnprintf functions | |
16 | * So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de> | |
17 | * - scnprintf and vscnprintf | |
18 | */ | |
19 | ||
20 | #include <stdarg.h> | |
ef27ac18 | 21 | #include <linux/build_bug.h> |
0d1d7a55 | 22 | #include <linux/clk.h> |
900cca29 | 23 | #include <linux/clk-provider.h> |
8bc3bcc9 | 24 | #include <linux/module.h> /* for KSYM_SYMBOL_LEN */ |
1da177e4 LT |
25 | #include <linux/types.h> |
26 | #include <linux/string.h> | |
27 | #include <linux/ctype.h> | |
28 | #include <linux/kernel.h> | |
0fe1ef24 | 29 | #include <linux/kallsyms.h> |
53809751 | 30 | #include <linux/math64.h> |
0fe1ef24 | 31 | #include <linux/uaccess.h> |
332d2e78 | 32 | #include <linux/ioport.h> |
4b6ccca7 | 33 | #include <linux/dcache.h> |
312b4e22 | 34 | #include <linux/cred.h> |
4d42c447 | 35 | #include <linux/rtc.h> |
2b1b0d66 | 36 | #include <linux/uuid.h> |
ce4fecf1 | 37 | #include <linux/of.h> |
8a27f7c9 | 38 | #include <net/addrconf.h> |
ad67b74d TH |
39 | #include <linux/siphash.h> |
40 | #include <linux/compiler.h> | |
1031bc58 DM |
41 | #ifdef CONFIG_BLOCK |
42 | #include <linux/blkdev.h> | |
43 | #endif | |
1da177e4 | 44 | |
edf14cdb VB |
45 | #include "../mm/internal.h" /* For the trace_print_flags arrays */ |
46 | ||
4e57b681 | 47 | #include <asm/page.h> /* for PAGE_SIZE */ |
7c43d9a3 | 48 | #include <asm/byteorder.h> /* cpu_to_le16 */ |
1da177e4 | 49 | |
71dca95d | 50 | #include <linux/string_helpers.h> |
1dff46d6 | 51 | #include "kstrtox.h" |
aa46a63e | 52 | |
1da177e4 | 53 | /** |
922ac25c | 54 | * simple_strtoull - convert a string to an unsigned long long |
1da177e4 LT |
55 | * @cp: The start of the string |
56 | * @endp: A pointer to the end of the parsed string will be placed here | |
57 | * @base: The number base to use | |
462e4711 EZ |
58 | * |
59 | * This function is obsolete. Please use kstrtoull instead. | |
1da177e4 | 60 | */ |
922ac25c | 61 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
1da177e4 | 62 | { |
1dff46d6 AD |
63 | unsigned long long result; |
64 | unsigned int rv; | |
aa46a63e | 65 | |
1dff46d6 AD |
66 | cp = _parse_integer_fixup_radix(cp, &base); |
67 | rv = _parse_integer(cp, base, &result); | |
68 | /* FIXME */ | |
69 | cp += (rv & ~KSTRTOX_OVERFLOW); | |
aa46a63e | 70 | |
1da177e4 LT |
71 | if (endp) |
72 | *endp = (char *)cp; | |
7b9186f5 | 73 | |
1da177e4 LT |
74 | return result; |
75 | } | |
922ac25c | 76 | EXPORT_SYMBOL(simple_strtoull); |
1da177e4 LT |
77 | |
78 | /** | |
922ac25c | 79 | * simple_strtoul - convert a string to an unsigned long |
1da177e4 LT |
80 | * @cp: The start of the string |
81 | * @endp: A pointer to the end of the parsed string will be placed here | |
82 | * @base: The number base to use | |
462e4711 EZ |
83 | * |
84 | * This function is obsolete. Please use kstrtoul instead. | |
1da177e4 | 85 | */ |
922ac25c | 86 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
1da177e4 | 87 | { |
922ac25c | 88 | return simple_strtoull(cp, endp, base); |
1da177e4 | 89 | } |
922ac25c | 90 | EXPORT_SYMBOL(simple_strtoul); |
1da177e4 LT |
91 | |
92 | /** | |
922ac25c | 93 | * simple_strtol - convert a string to a signed long |
1da177e4 LT |
94 | * @cp: The start of the string |
95 | * @endp: A pointer to the end of the parsed string will be placed here | |
96 | * @base: The number base to use | |
462e4711 EZ |
97 | * |
98 | * This function is obsolete. Please use kstrtol instead. | |
1da177e4 | 99 | */ |
922ac25c | 100 | long simple_strtol(const char *cp, char **endp, unsigned int base) |
1da177e4 | 101 | { |
922ac25c AGR |
102 | if (*cp == '-') |
103 | return -simple_strtoul(cp + 1, endp, base); | |
7b9186f5 | 104 | |
922ac25c | 105 | return simple_strtoul(cp, endp, base); |
1da177e4 | 106 | } |
922ac25c | 107 | EXPORT_SYMBOL(simple_strtol); |
1da177e4 LT |
108 | |
109 | /** | |
110 | * simple_strtoll - convert a string to a signed long long | |
111 | * @cp: The start of the string | |
112 | * @endp: A pointer to the end of the parsed string will be placed here | |
113 | * @base: The number base to use | |
462e4711 EZ |
114 | * |
115 | * This function is obsolete. Please use kstrtoll instead. | |
1da177e4 | 116 | */ |
22d27051 | 117 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
1da177e4 | 118 | { |
7b9186f5 | 119 | if (*cp == '-') |
22d27051 | 120 | return -simple_strtoull(cp + 1, endp, base); |
7b9186f5 | 121 | |
22d27051 | 122 | return simple_strtoull(cp, endp, base); |
1da177e4 | 123 | } |
98d5ce0d | 124 | EXPORT_SYMBOL(simple_strtoll); |
1da177e4 | 125 | |
cf3b429b JP |
126 | static noinline_for_stack |
127 | int skip_atoi(const char **s) | |
1da177e4 | 128 | { |
7b9186f5 | 129 | int i = 0; |
1da177e4 | 130 | |
43e5b666 | 131 | do { |
1da177e4 | 132 | i = i*10 + *((*s)++) - '0'; |
43e5b666 | 133 | } while (isdigit(**s)); |
7b9186f5 | 134 | |
1da177e4 LT |
135 | return i; |
136 | } | |
137 | ||
7c43d9a3 RV |
138 | /* |
139 | * Decimal conversion is by far the most typical, and is used for | |
140 | * /proc and /sys data. This directly impacts e.g. top performance | |
141 | * with many processes running. We optimize it for speed by emitting | |
142 | * two characters at a time, using a 200 byte lookup table. This | |
143 | * roughly halves the number of multiplications compared to computing | |
144 | * the digits one at a time. Implementation strongly inspired by the | |
145 | * previous version, which in turn used ideas described at | |
146 | * <http://www.cs.uiowa.edu/~jones/bcd/divide.html> (with permission | |
147 | * from the author, Douglas W. Jones). | |
148 | * | |
149 | * It turns out there is precisely one 26 bit fixed-point | |
150 | * approximation a of 64/100 for which x/100 == (x * (u64)a) >> 32 | |
151 | * holds for all x in [0, 10^8-1], namely a = 0x28f5c29. The actual | |
152 | * range happens to be somewhat larger (x <= 1073741898), but that's | |
153 | * irrelevant for our purpose. | |
154 | * | |
155 | * For dividing a number in the range [10^4, 10^6-1] by 100, we still | |
156 | * need a 32x32->64 bit multiply, so we simply use the same constant. | |
157 | * | |
158 | * For dividing a number in the range [100, 10^4-1] by 100, there are | |
159 | * several options. The simplest is (x * 0x147b) >> 19, which is valid | |
160 | * for all x <= 43698. | |
133fd9f5 | 161 | */ |
4277eedd | 162 | |
7c43d9a3 RV |
163 | static const u16 decpair[100] = { |
164 | #define _(x) (__force u16) cpu_to_le16(((x % 10) | ((x / 10) << 8)) + 0x3030) | |
165 | _( 0), _( 1), _( 2), _( 3), _( 4), _( 5), _( 6), _( 7), _( 8), _( 9), | |
166 | _(10), _(11), _(12), _(13), _(14), _(15), _(16), _(17), _(18), _(19), | |
167 | _(20), _(21), _(22), _(23), _(24), _(25), _(26), _(27), _(28), _(29), | |
168 | _(30), _(31), _(32), _(33), _(34), _(35), _(36), _(37), _(38), _(39), | |
169 | _(40), _(41), _(42), _(43), _(44), _(45), _(46), _(47), _(48), _(49), | |
170 | _(50), _(51), _(52), _(53), _(54), _(55), _(56), _(57), _(58), _(59), | |
171 | _(60), _(61), _(62), _(63), _(64), _(65), _(66), _(67), _(68), _(69), | |
172 | _(70), _(71), _(72), _(73), _(74), _(75), _(76), _(77), _(78), _(79), | |
173 | _(80), _(81), _(82), _(83), _(84), _(85), _(86), _(87), _(88), _(89), | |
174 | _(90), _(91), _(92), _(93), _(94), _(95), _(96), _(97), _(98), _(99), | |
175 | #undef _ | |
176 | }; | |
177 | ||
178 | /* | |
179 | * This will print a single '0' even if r == 0, since we would | |
675cf53c RV |
180 | * immediately jump to out_r where two 0s would be written but only |
181 | * one of them accounted for in buf. This is needed by ip4_string | |
182 | * below. All other callers pass a non-zero value of r. | |
7c43d9a3 | 183 | */ |
cf3b429b | 184 | static noinline_for_stack |
7c43d9a3 | 185 | char *put_dec_trunc8(char *buf, unsigned r) |
4277eedd | 186 | { |
7c43d9a3 RV |
187 | unsigned q; |
188 | ||
189 | /* 1 <= r < 10^8 */ | |
190 | if (r < 100) | |
191 | goto out_r; | |
192 | ||
193 | /* 100 <= r < 10^8 */ | |
194 | q = (r * (u64)0x28f5c29) >> 32; | |
195 | *((u16 *)buf) = decpair[r - 100*q]; | |
196 | buf += 2; | |
197 | ||
198 | /* 1 <= q < 10^6 */ | |
199 | if (q < 100) | |
200 | goto out_q; | |
201 | ||
202 | /* 100 <= q < 10^6 */ | |
203 | r = (q * (u64)0x28f5c29) >> 32; | |
204 | *((u16 *)buf) = decpair[q - 100*r]; | |
205 | buf += 2; | |
206 | ||
207 | /* 1 <= r < 10^4 */ | |
208 | if (r < 100) | |
209 | goto out_r; | |
210 | ||
211 | /* 100 <= r < 10^4 */ | |
212 | q = (r * 0x147b) >> 19; | |
213 | *((u16 *)buf) = decpair[r - 100*q]; | |
214 | buf += 2; | |
215 | out_q: | |
216 | /* 1 <= q < 100 */ | |
217 | r = q; | |
218 | out_r: | |
219 | /* 1 <= r < 100 */ | |
220 | *((u16 *)buf) = decpair[r]; | |
675cf53c | 221 | buf += r < 10 ? 1 : 2; |
4277eedd DV |
222 | return buf; |
223 | } | |
133fd9f5 | 224 | |
7c43d9a3 | 225 | #if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG == 64 |
cf3b429b | 226 | static noinline_for_stack |
7c43d9a3 | 227 | char *put_dec_full8(char *buf, unsigned r) |
4277eedd | 228 | { |
133fd9f5 DV |
229 | unsigned q; |
230 | ||
7c43d9a3 RV |
231 | /* 0 <= r < 10^8 */ |
232 | q = (r * (u64)0x28f5c29) >> 32; | |
233 | *((u16 *)buf) = decpair[r - 100*q]; | |
234 | buf += 2; | |
4277eedd | 235 | |
7c43d9a3 RV |
236 | /* 0 <= q < 10^6 */ |
237 | r = (q * (u64)0x28f5c29) >> 32; | |
238 | *((u16 *)buf) = decpair[q - 100*r]; | |
239 | buf += 2; | |
7b9186f5 | 240 | |
7c43d9a3 RV |
241 | /* 0 <= r < 10^4 */ |
242 | q = (r * 0x147b) >> 19; | |
243 | *((u16 *)buf) = decpair[r - 100*q]; | |
244 | buf += 2; | |
133fd9f5 | 245 | |
7c43d9a3 RV |
246 | /* 0 <= q < 100 */ |
247 | *((u16 *)buf) = decpair[q]; | |
248 | buf += 2; | |
249 | return buf; | |
250 | } | |
133fd9f5 | 251 | |
7c43d9a3 | 252 | static noinline_for_stack |
133fd9f5 DV |
253 | char *put_dec(char *buf, unsigned long long n) |
254 | { | |
7c43d9a3 RV |
255 | if (n >= 100*1000*1000) |
256 | buf = put_dec_full8(buf, do_div(n, 100*1000*1000)); | |
257 | /* 1 <= n <= 1.6e11 */ | |
258 | if (n >= 100*1000*1000) | |
259 | buf = put_dec_full8(buf, do_div(n, 100*1000*1000)); | |
260 | /* 1 <= n < 1e8 */ | |
133fd9f5 | 261 | return put_dec_trunc8(buf, n); |
4277eedd | 262 | } |
133fd9f5 | 263 | |
7c43d9a3 | 264 | #elif BITS_PER_LONG == 32 && BITS_PER_LONG_LONG == 64 |
133fd9f5 | 265 | |
7c43d9a3 RV |
266 | static void |
267 | put_dec_full4(char *buf, unsigned r) | |
4277eedd | 268 | { |
7c43d9a3 RV |
269 | unsigned q; |
270 | ||
271 | /* 0 <= r < 10^4 */ | |
272 | q = (r * 0x147b) >> 19; | |
273 | *((u16 *)buf) = decpair[r - 100*q]; | |
274 | buf += 2; | |
275 | /* 0 <= q < 100 */ | |
276 | *((u16 *)buf) = decpair[q]; | |
2359172a GS |
277 | } |
278 | ||
279 | /* | |
280 | * Call put_dec_full4 on x % 10000, return x / 10000. | |
281 | * The approximation x/10000 == (x * 0x346DC5D7) >> 43 | |
282 | * holds for all x < 1,128,869,999. The largest value this | |
283 | * helper will ever be asked to convert is 1,125,520,955. | |
7c43d9a3 | 284 | * (second call in the put_dec code, assuming n is all-ones). |
2359172a | 285 | */ |
7c43d9a3 | 286 | static noinline_for_stack |
2359172a GS |
287 | unsigned put_dec_helper4(char *buf, unsigned x) |
288 | { | |
289 | uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43; | |
290 | ||
291 | put_dec_full4(buf, x - q * 10000); | |
292 | return q; | |
4277eedd DV |
293 | } |
294 | ||
133fd9f5 DV |
295 | /* Based on code by Douglas W. Jones found at |
296 | * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour> | |
297 | * (with permission from the author). | |
298 | * Performs no 64-bit division and hence should be fast on 32-bit machines. | |
299 | */ | |
300 | static | |
301 | char *put_dec(char *buf, unsigned long long n) | |
302 | { | |
303 | uint32_t d3, d2, d1, q, h; | |
304 | ||
305 | if (n < 100*1000*1000) | |
306 | return put_dec_trunc8(buf, n); | |
307 | ||
308 | d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */ | |
309 | h = (n >> 32); | |
310 | d2 = (h ) & 0xffff; | |
311 | d3 = (h >> 16); /* implicit "& 0xffff" */ | |
312 | ||
7c43d9a3 RV |
313 | /* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0 |
314 | = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */ | |
133fd9f5 | 315 | q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff); |
2359172a GS |
316 | q = put_dec_helper4(buf, q); |
317 | ||
318 | q += 7671 * d3 + 9496 * d2 + 6 * d1; | |
319 | q = put_dec_helper4(buf+4, q); | |
320 | ||
321 | q += 4749 * d3 + 42 * d2; | |
322 | q = put_dec_helper4(buf+8, q); | |
133fd9f5 | 323 | |
2359172a GS |
324 | q += 281 * d3; |
325 | buf += 12; | |
326 | if (q) | |
327 | buf = put_dec_trunc8(buf, q); | |
328 | else while (buf[-1] == '0') | |
133fd9f5 DV |
329 | --buf; |
330 | ||
331 | return buf; | |
332 | } | |
333 | ||
334 | #endif | |
335 | ||
1ac101a5 KH |
336 | /* |
337 | * Convert passed number to decimal string. | |
338 | * Returns the length of string. On buffer overflow, returns 0. | |
339 | * | |
340 | * If speed is not important, use snprintf(). It's easy to read the code. | |
341 | */ | |
d1be35cb | 342 | int num_to_str(char *buf, int size, unsigned long long num, unsigned int width) |
1ac101a5 | 343 | { |
7c43d9a3 RV |
344 | /* put_dec requires 2-byte alignment of the buffer. */ |
345 | char tmp[sizeof(num) * 3] __aligned(2); | |
1ac101a5 KH |
346 | int idx, len; |
347 | ||
133fd9f5 DV |
348 | /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */ |
349 | if (num <= 9) { | |
350 | tmp[0] = '0' + num; | |
351 | len = 1; | |
352 | } else { | |
353 | len = put_dec(tmp, num) - tmp; | |
354 | } | |
1ac101a5 | 355 | |
d1be35cb | 356 | if (len > size || width > size) |
1ac101a5 | 357 | return 0; |
d1be35cb AV |
358 | |
359 | if (width > len) { | |
360 | width = width - len; | |
361 | for (idx = 0; idx < width; idx++) | |
362 | buf[idx] = ' '; | |
363 | } else { | |
364 | width = 0; | |
365 | } | |
366 | ||
1ac101a5 | 367 | for (idx = 0; idx < len; ++idx) |
d1be35cb AV |
368 | buf[idx + width] = tmp[len - idx - 1]; |
369 | ||
370 | return len + width; | |
1ac101a5 KH |
371 | } |
372 | ||
51be17df | 373 | #define SIGN 1 /* unsigned/signed, must be 1 */ |
d1c1b121 | 374 | #define LEFT 2 /* left justified */ |
1da177e4 LT |
375 | #define PLUS 4 /* show plus */ |
376 | #define SPACE 8 /* space if plus */ | |
d1c1b121 | 377 | #define ZEROPAD 16 /* pad with zero, must be 16 == '0' - ' ' */ |
b89dc5d6 BH |
378 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ |
379 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ | |
1da177e4 | 380 | |
fef20d9c FW |
381 | enum format_type { |
382 | FORMAT_TYPE_NONE, /* Just a string part */ | |
ed681a91 | 383 | FORMAT_TYPE_WIDTH, |
fef20d9c FW |
384 | FORMAT_TYPE_PRECISION, |
385 | FORMAT_TYPE_CHAR, | |
386 | FORMAT_TYPE_STR, | |
387 | FORMAT_TYPE_PTR, | |
388 | FORMAT_TYPE_PERCENT_CHAR, | |
389 | FORMAT_TYPE_INVALID, | |
390 | FORMAT_TYPE_LONG_LONG, | |
391 | FORMAT_TYPE_ULONG, | |
392 | FORMAT_TYPE_LONG, | |
a4e94ef0 Z |
393 | FORMAT_TYPE_UBYTE, |
394 | FORMAT_TYPE_BYTE, | |
fef20d9c FW |
395 | FORMAT_TYPE_USHORT, |
396 | FORMAT_TYPE_SHORT, | |
397 | FORMAT_TYPE_UINT, | |
398 | FORMAT_TYPE_INT, | |
fef20d9c FW |
399 | FORMAT_TYPE_SIZE_T, |
400 | FORMAT_TYPE_PTRDIFF | |
401 | }; | |
402 | ||
403 | struct printf_spec { | |
d0484193 RV |
404 | unsigned int type:8; /* format_type enum */ |
405 | signed int field_width:24; /* width of output field */ | |
406 | unsigned int flags:8; /* flags to number() */ | |
407 | unsigned int base:8; /* number base, 8, 10 or 16 only */ | |
408 | signed int precision:16; /* # of digits/chars */ | |
409 | } __packed; | |
ef27ac18 RV |
410 | static_assert(sizeof(struct printf_spec) == 8); |
411 | ||
4d72ba01 RV |
412 | #define FIELD_WIDTH_MAX ((1 << 23) - 1) |
413 | #define PRECISION_MAX ((1 << 15) - 1) | |
fef20d9c | 414 | |
cf3b429b JP |
415 | static noinline_for_stack |
416 | char *number(char *buf, char *end, unsigned long long num, | |
417 | struct printf_spec spec) | |
1da177e4 | 418 | { |
7c43d9a3 RV |
419 | /* put_dec requires 2-byte alignment of the buffer. */ |
420 | char tmp[3 * sizeof(num)] __aligned(2); | |
9b706aee DV |
421 | char sign; |
422 | char locase; | |
fef20d9c | 423 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
1da177e4 | 424 | int i; |
7c203422 | 425 | bool is_zero = num == 0LL; |
1c7a8e62 RV |
426 | int field_width = spec.field_width; |
427 | int precision = spec.precision; | |
1da177e4 | 428 | |
9b706aee DV |
429 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
430 | * produces same digits or (maybe lowercased) letters */ | |
fef20d9c FW |
431 | locase = (spec.flags & SMALL); |
432 | if (spec.flags & LEFT) | |
433 | spec.flags &= ~ZEROPAD; | |
1da177e4 | 434 | sign = 0; |
fef20d9c | 435 | if (spec.flags & SIGN) { |
7b9186f5 | 436 | if ((signed long long)num < 0) { |
1da177e4 | 437 | sign = '-'; |
7b9186f5 | 438 | num = -(signed long long)num; |
1c7a8e62 | 439 | field_width--; |
fef20d9c | 440 | } else if (spec.flags & PLUS) { |
1da177e4 | 441 | sign = '+'; |
1c7a8e62 | 442 | field_width--; |
fef20d9c | 443 | } else if (spec.flags & SPACE) { |
1da177e4 | 444 | sign = ' '; |
1c7a8e62 | 445 | field_width--; |
1da177e4 LT |
446 | } |
447 | } | |
b39a7340 | 448 | if (need_pfx) { |
fef20d9c | 449 | if (spec.base == 16) |
1c7a8e62 | 450 | field_width -= 2; |
7c203422 | 451 | else if (!is_zero) |
1c7a8e62 | 452 | field_width--; |
1da177e4 | 453 | } |
b39a7340 DV |
454 | |
455 | /* generate full string in tmp[], in reverse order */ | |
1da177e4 | 456 | i = 0; |
133fd9f5 | 457 | if (num < spec.base) |
3ea8d440 | 458 | tmp[i++] = hex_asc_upper[num] | locase; |
fef20d9c FW |
459 | else if (spec.base != 10) { /* 8 or 16 */ |
460 | int mask = spec.base - 1; | |
b39a7340 | 461 | int shift = 3; |
7b9186f5 AGR |
462 | |
463 | if (spec.base == 16) | |
464 | shift = 4; | |
b39a7340 | 465 | do { |
3ea8d440 | 466 | tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase); |
b39a7340 DV |
467 | num >>= shift; |
468 | } while (num); | |
4277eedd DV |
469 | } else { /* base 10 */ |
470 | i = put_dec(tmp, num) - tmp; | |
471 | } | |
b39a7340 DV |
472 | |
473 | /* printing 100 using %2d gives "100", not "00" */ | |
1c7a8e62 RV |
474 | if (i > precision) |
475 | precision = i; | |
b39a7340 | 476 | /* leading space padding */ |
1c7a8e62 | 477 | field_width -= precision; |
51be17df | 478 | if (!(spec.flags & (ZEROPAD | LEFT))) { |
1c7a8e62 | 479 | while (--field_width >= 0) { |
f796937a | 480 | if (buf < end) |
1da177e4 LT |
481 | *buf = ' '; |
482 | ++buf; | |
483 | } | |
484 | } | |
b39a7340 | 485 | /* sign */ |
1da177e4 | 486 | if (sign) { |
f796937a | 487 | if (buf < end) |
1da177e4 LT |
488 | *buf = sign; |
489 | ++buf; | |
490 | } | |
b39a7340 DV |
491 | /* "0x" / "0" prefix */ |
492 | if (need_pfx) { | |
7c203422 PC |
493 | if (spec.base == 16 || !is_zero) { |
494 | if (buf < end) | |
495 | *buf = '0'; | |
496 | ++buf; | |
497 | } | |
fef20d9c | 498 | if (spec.base == 16) { |
f796937a | 499 | if (buf < end) |
9b706aee | 500 | *buf = ('X' | locase); |
1da177e4 LT |
501 | ++buf; |
502 | } | |
503 | } | |
b39a7340 | 504 | /* zero or space padding */ |
fef20d9c | 505 | if (!(spec.flags & LEFT)) { |
d1c1b121 RV |
506 | char c = ' ' + (spec.flags & ZEROPAD); |
507 | BUILD_BUG_ON(' ' + ZEROPAD != '0'); | |
1c7a8e62 | 508 | while (--field_width >= 0) { |
f796937a | 509 | if (buf < end) |
1da177e4 LT |
510 | *buf = c; |
511 | ++buf; | |
512 | } | |
513 | } | |
b39a7340 | 514 | /* hmm even more zero padding? */ |
1c7a8e62 | 515 | while (i <= --precision) { |
f796937a | 516 | if (buf < end) |
1da177e4 LT |
517 | *buf = '0'; |
518 | ++buf; | |
519 | } | |
b39a7340 DV |
520 | /* actual digits of result */ |
521 | while (--i >= 0) { | |
f796937a | 522 | if (buf < end) |
1da177e4 LT |
523 | *buf = tmp[i]; |
524 | ++buf; | |
525 | } | |
b39a7340 | 526 | /* trailing space padding */ |
1c7a8e62 | 527 | while (--field_width >= 0) { |
f796937a | 528 | if (buf < end) |
1da177e4 LT |
529 | *buf = ' '; |
530 | ++buf; | |
531 | } | |
7b9186f5 | 532 | |
1da177e4 LT |
533 | return buf; |
534 | } | |
535 | ||
3cab1e71 AS |
536 | static noinline_for_stack |
537 | char *special_hex_number(char *buf, char *end, unsigned long long num, int size) | |
538 | { | |
539 | struct printf_spec spec; | |
540 | ||
541 | spec.type = FORMAT_TYPE_PTR; | |
542 | spec.field_width = 2 + 2 * size; /* 0x + hex */ | |
543 | spec.flags = SPECIAL | SMALL | ZEROPAD; | |
544 | spec.base = 16; | |
545 | spec.precision = -1; | |
546 | ||
547 | return number(buf, end, num, spec); | |
548 | } | |
549 | ||
cfccde04 | 550 | static void move_right(char *buf, char *end, unsigned len, unsigned spaces) |
4b6ccca7 AV |
551 | { |
552 | size_t size; | |
553 | if (buf >= end) /* nowhere to put anything */ | |
554 | return; | |
555 | size = end - buf; | |
556 | if (size <= spaces) { | |
557 | memset(buf, ' ', size); | |
558 | return; | |
559 | } | |
560 | if (len) { | |
561 | if (len > size - spaces) | |
562 | len = size - spaces; | |
563 | memmove(buf + spaces, buf, len); | |
564 | } | |
565 | memset(buf, ' ', spaces); | |
566 | } | |
567 | ||
cfccde04 RV |
568 | /* |
569 | * Handle field width padding for a string. | |
570 | * @buf: current buffer position | |
571 | * @n: length of string | |
572 | * @end: end of output buffer | |
573 | * @spec: for field width and flags | |
574 | * Returns: new buffer position after padding. | |
575 | */ | |
576 | static noinline_for_stack | |
577 | char *widen_string(char *buf, int n, char *end, struct printf_spec spec) | |
578 | { | |
579 | unsigned spaces; | |
580 | ||
581 | if (likely(n >= spec.field_width)) | |
582 | return buf; | |
583 | /* we want to pad the sucker */ | |
584 | spaces = spec.field_width - n; | |
585 | if (!(spec.flags & LEFT)) { | |
586 | move_right(buf - n, end, n, spaces); | |
587 | return buf + spaces; | |
588 | } | |
589 | while (spaces--) { | |
590 | if (buf < end) | |
591 | *buf = ' '; | |
592 | ++buf; | |
593 | } | |
594 | return buf; | |
595 | } | |
596 | ||
d529ac41 PM |
597 | /* Handle string from a well known address. */ |
598 | static char *string_nocheck(char *buf, char *end, const char *s, | |
599 | struct printf_spec spec) | |
95508cfa | 600 | { |
34fc8b90 | 601 | int len = 0; |
b314dd49 | 602 | int lim = spec.precision; |
95508cfa | 603 | |
34fc8b90 RV |
604 | while (lim--) { |
605 | char c = *s++; | |
606 | if (!c) | |
607 | break; | |
95508cfa | 608 | if (buf < end) |
34fc8b90 | 609 | *buf = c; |
95508cfa | 610 | ++buf; |
34fc8b90 | 611 | ++len; |
95508cfa | 612 | } |
34fc8b90 | 613 | return widen_string(buf, len, end, spec); |
95508cfa RV |
614 | } |
615 | ||
c8c3b584 PM |
616 | /* Be careful: error messages must fit into the given buffer. */ |
617 | static char *error_string(char *buf, char *end, const char *s, | |
618 | struct printf_spec spec) | |
619 | { | |
620 | /* | |
621 | * Hard limit to avoid a completely insane messages. It actually | |
622 | * works pretty well because most error messages are in | |
623 | * the many pointer format modifiers. | |
624 | */ | |
625 | if (spec.precision == -1) | |
626 | spec.precision = 2 * sizeof(void *); | |
627 | ||
628 | return string_nocheck(buf, end, s, spec); | |
629 | } | |
630 | ||
3e5903eb | 631 | /* |
2ac5a3bf PM |
632 | * Do not call any complex external code here. Nested printk()/vsprintf() |
633 | * might cause infinite loops. Failures might break printk() and would | |
634 | * be hard to debug. | |
3e5903eb PM |
635 | */ |
636 | static const char *check_pointer_msg(const void *ptr) | |
637 | { | |
3e5903eb PM |
638 | if (!ptr) |
639 | return "(null)"; | |
640 | ||
2ac5a3bf | 641 | if ((unsigned long)ptr < PAGE_SIZE || IS_ERR_VALUE(ptr)) |
3e5903eb PM |
642 | return "(efault)"; |
643 | ||
644 | return NULL; | |
645 | } | |
646 | ||
647 | static int check_pointer(char **buf, char *end, const void *ptr, | |
648 | struct printf_spec spec) | |
649 | { | |
650 | const char *err_msg; | |
651 | ||
652 | err_msg = check_pointer_msg(ptr); | |
653 | if (err_msg) { | |
c8c3b584 | 654 | *buf = error_string(*buf, end, err_msg, spec); |
3e5903eb PM |
655 | return -EFAULT; |
656 | } | |
657 | ||
658 | return 0; | |
659 | } | |
660 | ||
9073dac1 | 661 | static noinline_for_stack |
d529ac41 PM |
662 | char *string(char *buf, char *end, const char *s, |
663 | struct printf_spec spec) | |
664 | { | |
3e5903eb PM |
665 | if (check_pointer(&buf, end, s, spec)) |
666 | return buf; | |
d529ac41 PM |
667 | |
668 | return string_nocheck(buf, end, s, spec); | |
669 | } | |
670 | ||
ce9d3ece Y |
671 | static char *pointer_string(char *buf, char *end, |
672 | const void *ptr, | |
673 | struct printf_spec spec) | |
9073dac1 GU |
674 | { |
675 | spec.base = 16; | |
676 | spec.flags |= SMALL; | |
677 | if (spec.field_width == -1) { | |
678 | spec.field_width = 2 * sizeof(ptr); | |
679 | spec.flags |= ZEROPAD; | |
680 | } | |
681 | ||
682 | return number(buf, end, (unsigned long int)ptr, spec); | |
683 | } | |
684 | ||
685 | /* Make pointers available for printing early in the boot sequence. */ | |
686 | static int debug_boot_weak_hash __ro_after_init; | |
687 | ||
688 | static int __init debug_boot_weak_hash_enable(char *str) | |
689 | { | |
690 | debug_boot_weak_hash = 1; | |
691 | pr_info("debug_boot_weak_hash enabled\n"); | |
692 | return 0; | |
693 | } | |
694 | early_param("debug_boot_weak_hash", debug_boot_weak_hash_enable); | |
695 | ||
696 | static DEFINE_STATIC_KEY_TRUE(not_filled_random_ptr_key); | |
697 | static siphash_key_t ptr_key __read_mostly; | |
698 | ||
699 | static void enable_ptr_key_workfn(struct work_struct *work) | |
700 | { | |
701 | get_random_bytes(&ptr_key, sizeof(ptr_key)); | |
702 | /* Needs to run from preemptible context */ | |
703 | static_branch_disable(¬_filled_random_ptr_key); | |
704 | } | |
705 | ||
706 | static DECLARE_WORK(enable_ptr_key_work, enable_ptr_key_workfn); | |
707 | ||
708 | static void fill_random_ptr_key(struct random_ready_callback *unused) | |
709 | { | |
710 | /* This may be in an interrupt handler. */ | |
711 | queue_work(system_unbound_wq, &enable_ptr_key_work); | |
712 | } | |
713 | ||
714 | static struct random_ready_callback random_ready = { | |
715 | .func = fill_random_ptr_key | |
716 | }; | |
717 | ||
718 | static int __init initialize_ptr_random(void) | |
719 | { | |
720 | int key_size = sizeof(ptr_key); | |
721 | int ret; | |
722 | ||
723 | /* Use hw RNG if available. */ | |
724 | if (get_random_bytes_arch(&ptr_key, key_size) == key_size) { | |
725 | static_branch_disable(¬_filled_random_ptr_key); | |
726 | return 0; | |
727 | } | |
728 | ||
729 | ret = add_random_ready_callback(&random_ready); | |
730 | if (!ret) { | |
731 | return 0; | |
732 | } else if (ret == -EALREADY) { | |
733 | /* This is in preemptible context */ | |
734 | enable_ptr_key_workfn(&enable_ptr_key_work); | |
735 | return 0; | |
736 | } | |
737 | ||
738 | return ret; | |
739 | } | |
740 | early_initcall(initialize_ptr_random); | |
741 | ||
742 | /* Maps a pointer to a 32 bit unique identifier. */ | |
743 | static char *ptr_to_id(char *buf, char *end, const void *ptr, | |
744 | struct printf_spec spec) | |
745 | { | |
746 | const char *str = sizeof(ptr) == 8 ? "(____ptrval____)" : "(ptrval)"; | |
747 | unsigned long hashval; | |
748 | ||
749 | /* When debugging early boot use non-cryptographically secure hash. */ | |
750 | if (unlikely(debug_boot_weak_hash)) { | |
751 | hashval = hash_long((unsigned long)ptr, 32); | |
752 | return pointer_string(buf, end, (const void *)hashval, spec); | |
753 | } | |
754 | ||
755 | if (static_branch_unlikely(¬_filled_random_ptr_key)) { | |
756 | spec.field_width = 2 * sizeof(ptr); | |
757 | /* string length must be less than default_width */ | |
c8c3b584 | 758 | return error_string(buf, end, str, spec); |
9073dac1 GU |
759 | } |
760 | ||
761 | #ifdef CONFIG_64BIT | |
762 | hashval = (unsigned long)siphash_1u64((u64)ptr, &ptr_key); | |
763 | /* | |
764 | * Mask off the first 32 bits, this makes explicit that we have | |
765 | * modified the address (and 32 bits is plenty for a unique ID). | |
766 | */ | |
767 | hashval = hashval & 0xffffffff; | |
768 | #else | |
769 | hashval = (unsigned long)siphash_1u32((u32)ptr, &ptr_key); | |
770 | #endif | |
771 | return pointer_string(buf, end, (const void *)hashval, spec); | |
772 | } | |
773 | ||
6eea242f PM |
774 | int kptr_restrict __read_mostly; |
775 | ||
776 | static noinline_for_stack | |
777 | char *restricted_pointer(char *buf, char *end, const void *ptr, | |
778 | struct printf_spec spec) | |
779 | { | |
780 | switch (kptr_restrict) { | |
781 | case 0: | |
1ac2f978 PM |
782 | /* Handle as %p, hash and do _not_ leak addresses. */ |
783 | return ptr_to_id(buf, end, ptr, spec); | |
6eea242f PM |
784 | case 1: { |
785 | const struct cred *cred; | |
786 | ||
787 | /* | |
788 | * kptr_restrict==1 cannot be used in IRQ context | |
789 | * because its test for CAP_SYSLOG would be meaningless. | |
790 | */ | |
791 | if (in_irq() || in_serving_softirq() || in_nmi()) { | |
792 | if (spec.field_width == -1) | |
793 | spec.field_width = 2 * sizeof(ptr); | |
c8c3b584 | 794 | return error_string(buf, end, "pK-error", spec); |
6eea242f PM |
795 | } |
796 | ||
797 | /* | |
798 | * Only print the real pointer value if the current | |
799 | * process has CAP_SYSLOG and is running with the | |
800 | * same credentials it started with. This is because | |
801 | * access to files is checked at open() time, but %pK | |
802 | * checks permission at read() time. We don't want to | |
803 | * leak pointer values if a binary opens a file using | |
804 | * %pK and then elevates privileges before reading it. | |
805 | */ | |
806 | cred = current_cred(); | |
807 | if (!has_capability_noaudit(current, CAP_SYSLOG) || | |
808 | !uid_eq(cred->euid, cred->uid) || | |
809 | !gid_eq(cred->egid, cred->gid)) | |
810 | ptr = NULL; | |
811 | break; | |
812 | } | |
813 | case 2: | |
814 | default: | |
815 | /* Always print 0's for %pK */ | |
816 | ptr = NULL; | |
817 | break; | |
818 | } | |
819 | ||
820 | return pointer_string(buf, end, ptr, spec); | |
821 | } | |
822 | ||
4b6ccca7 AV |
823 | static noinline_for_stack |
824 | char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec, | |
825 | const char *fmt) | |
826 | { | |
827 | const char *array[4], *s; | |
828 | const struct dentry *p; | |
829 | int depth; | |
830 | int i, n; | |
831 | ||
832 | switch (fmt[1]) { | |
833 | case '2': case '3': case '4': | |
834 | depth = fmt[1] - '0'; | |
835 | break; | |
836 | default: | |
837 | depth = 1; | |
838 | } | |
839 | ||
840 | rcu_read_lock(); | |
841 | for (i = 0; i < depth; i++, d = p) { | |
3e5903eb PM |
842 | if (check_pointer(&buf, end, d, spec)) { |
843 | rcu_read_unlock(); | |
844 | return buf; | |
845 | } | |
846 | ||
6aa7de05 MR |
847 | p = READ_ONCE(d->d_parent); |
848 | array[i] = READ_ONCE(d->d_name.name); | |
4b6ccca7 AV |
849 | if (p == d) { |
850 | if (i) | |
851 | array[i] = ""; | |
852 | i++; | |
853 | break; | |
854 | } | |
855 | } | |
856 | s = array[--i]; | |
857 | for (n = 0; n != spec.precision; n++, buf++) { | |
858 | char c = *s++; | |
859 | if (!c) { | |
860 | if (!i) | |
861 | break; | |
862 | c = '/'; | |
863 | s = array[--i]; | |
864 | } | |
865 | if (buf < end) | |
866 | *buf = c; | |
867 | } | |
868 | rcu_read_unlock(); | |
cfccde04 | 869 | return widen_string(buf, n, end, spec); |
4b6ccca7 AV |
870 | } |
871 | ||
1031bc58 DM |
872 | #ifdef CONFIG_BLOCK |
873 | static noinline_for_stack | |
874 | char *bdev_name(char *buf, char *end, struct block_device *bdev, | |
875 | struct printf_spec spec, const char *fmt) | |
876 | { | |
3e5903eb PM |
877 | struct gendisk *hd; |
878 | ||
879 | if (check_pointer(&buf, end, bdev, spec)) | |
880 | return buf; | |
881 | ||
882 | hd = bdev->bd_disk; | |
1031bc58 DM |
883 | buf = string(buf, end, hd->disk_name, spec); |
884 | if (bdev->bd_part->partno) { | |
885 | if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) { | |
886 | if (buf < end) | |
887 | *buf = 'p'; | |
888 | buf++; | |
889 | } | |
890 | buf = number(buf, end, bdev->bd_part->partno, spec); | |
891 | } | |
892 | return buf; | |
893 | } | |
894 | #endif | |
895 | ||
cf3b429b JP |
896 | static noinline_for_stack |
897 | char *symbol_string(char *buf, char *end, void *ptr, | |
b0d33c2b | 898 | struct printf_spec spec, const char *fmt) |
0fe1ef24 | 899 | { |
b0d33c2b | 900 | unsigned long value; |
0fe1ef24 LT |
901 | #ifdef CONFIG_KALLSYMS |
902 | char sym[KSYM_SYMBOL_LEN]; | |
b0d33c2b JP |
903 | #endif |
904 | ||
905 | if (fmt[1] == 'R') | |
906 | ptr = __builtin_extract_return_addr(ptr); | |
907 | value = (unsigned long)ptr; | |
908 | ||
909 | #ifdef CONFIG_KALLSYMS | |
910 | if (*fmt == 'B') | |
0f77a8d3 | 911 | sprint_backtrace(sym, value); |
b0d33c2b | 912 | else if (*fmt != 'f' && *fmt != 's') |
0c8b946e FW |
913 | sprint_symbol(sym, value); |
914 | else | |
4796dd20 | 915 | sprint_symbol_no_offset(sym, value); |
7b9186f5 | 916 | |
d529ac41 | 917 | return string_nocheck(buf, end, sym, spec); |
0fe1ef24 | 918 | #else |
3cab1e71 | 919 | return special_hex_number(buf, end, value, sizeof(void *)); |
0fe1ef24 LT |
920 | #endif |
921 | } | |
922 | ||
abd4fe62 AS |
923 | static const struct printf_spec default_str_spec = { |
924 | .field_width = -1, | |
925 | .precision = -1, | |
926 | }; | |
927 | ||
54433973 AS |
928 | static const struct printf_spec default_flag_spec = { |
929 | .base = 16, | |
930 | .precision = -1, | |
931 | .flags = SPECIAL | SMALL, | |
932 | }; | |
933 | ||
ce0b4910 AS |
934 | static const struct printf_spec default_dec_spec = { |
935 | .base = 10, | |
936 | .precision = -1, | |
937 | }; | |
938 | ||
4d42c447 AS |
939 | static const struct printf_spec default_dec02_spec = { |
940 | .base = 10, | |
941 | .field_width = 2, | |
942 | .precision = -1, | |
943 | .flags = ZEROPAD, | |
944 | }; | |
945 | ||
946 | static const struct printf_spec default_dec04_spec = { | |
947 | .base = 10, | |
948 | .field_width = 4, | |
949 | .precision = -1, | |
950 | .flags = ZEROPAD, | |
951 | }; | |
952 | ||
cf3b429b JP |
953 | static noinline_for_stack |
954 | char *resource_string(char *buf, char *end, struct resource *res, | |
955 | struct printf_spec spec, const char *fmt) | |
332d2e78 LT |
956 | { |
957 | #ifndef IO_RSRC_PRINTK_SIZE | |
28405372 | 958 | #define IO_RSRC_PRINTK_SIZE 6 |
332d2e78 LT |
959 | #endif |
960 | ||
961 | #ifndef MEM_RSRC_PRINTK_SIZE | |
28405372 | 962 | #define MEM_RSRC_PRINTK_SIZE 10 |
332d2e78 | 963 | #endif |
4da0b66c | 964 | static const struct printf_spec io_spec = { |
fef20d9c | 965 | .base = 16, |
4da0b66c | 966 | .field_width = IO_RSRC_PRINTK_SIZE, |
fef20d9c FW |
967 | .precision = -1, |
968 | .flags = SPECIAL | SMALL | ZEROPAD, | |
969 | }; | |
4da0b66c BH |
970 | static const struct printf_spec mem_spec = { |
971 | .base = 16, | |
972 | .field_width = MEM_RSRC_PRINTK_SIZE, | |
973 | .precision = -1, | |
974 | .flags = SPECIAL | SMALL | ZEROPAD, | |
975 | }; | |
0f4050c7 BH |
976 | static const struct printf_spec bus_spec = { |
977 | .base = 16, | |
978 | .field_width = 2, | |
979 | .precision = -1, | |
980 | .flags = SMALL | ZEROPAD, | |
981 | }; | |
4da0b66c | 982 | static const struct printf_spec str_spec = { |
fd95541e BH |
983 | .field_width = -1, |
984 | .precision = 10, | |
985 | .flags = LEFT, | |
986 | }; | |
c7dabef8 BH |
987 | |
988 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) | |
989 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ | |
990 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) | |
991 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) | |
9d7cca04 | 992 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") |
c7dabef8 BH |
993 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") |
994 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, | |
995 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; | |
996 | ||
332d2e78 | 997 | char *p = sym, *pend = sym + sizeof(sym); |
c7dabef8 | 998 | int decode = (fmt[0] == 'R') ? 1 : 0; |
4da0b66c | 999 | const struct printf_spec *specp; |
332d2e78 | 1000 | |
3e5903eb PM |
1001 | if (check_pointer(&buf, end, res, spec)) |
1002 | return buf; | |
1003 | ||
332d2e78 | 1004 | *p++ = '['; |
4da0b66c | 1005 | if (res->flags & IORESOURCE_IO) { |
d529ac41 | 1006 | p = string_nocheck(p, pend, "io ", str_spec); |
4da0b66c BH |
1007 | specp = &io_spec; |
1008 | } else if (res->flags & IORESOURCE_MEM) { | |
d529ac41 | 1009 | p = string_nocheck(p, pend, "mem ", str_spec); |
4da0b66c BH |
1010 | specp = &mem_spec; |
1011 | } else if (res->flags & IORESOURCE_IRQ) { | |
d529ac41 | 1012 | p = string_nocheck(p, pend, "irq ", str_spec); |
ce0b4910 | 1013 | specp = &default_dec_spec; |
4da0b66c | 1014 | } else if (res->flags & IORESOURCE_DMA) { |
d529ac41 | 1015 | p = string_nocheck(p, pend, "dma ", str_spec); |
ce0b4910 | 1016 | specp = &default_dec_spec; |
0f4050c7 | 1017 | } else if (res->flags & IORESOURCE_BUS) { |
d529ac41 | 1018 | p = string_nocheck(p, pend, "bus ", str_spec); |
0f4050c7 | 1019 | specp = &bus_spec; |
4da0b66c | 1020 | } else { |
d529ac41 | 1021 | p = string_nocheck(p, pend, "??? ", str_spec); |
4da0b66c | 1022 | specp = &mem_spec; |
c7dabef8 | 1023 | decode = 0; |
fd95541e | 1024 | } |
d19cb803 | 1025 | if (decode && res->flags & IORESOURCE_UNSET) { |
d529ac41 | 1026 | p = string_nocheck(p, pend, "size ", str_spec); |
d19cb803 BH |
1027 | p = number(p, pend, resource_size(res), *specp); |
1028 | } else { | |
1029 | p = number(p, pend, res->start, *specp); | |
1030 | if (res->start != res->end) { | |
1031 | *p++ = '-'; | |
1032 | p = number(p, pend, res->end, *specp); | |
1033 | } | |
c91d3376 | 1034 | } |
c7dabef8 | 1035 | if (decode) { |
fd95541e | 1036 | if (res->flags & IORESOURCE_MEM_64) |
d529ac41 | 1037 | p = string_nocheck(p, pend, " 64bit", str_spec); |
fd95541e | 1038 | if (res->flags & IORESOURCE_PREFETCH) |
d529ac41 | 1039 | p = string_nocheck(p, pend, " pref", str_spec); |
9d7cca04 | 1040 | if (res->flags & IORESOURCE_WINDOW) |
d529ac41 | 1041 | p = string_nocheck(p, pend, " window", str_spec); |
fd95541e | 1042 | if (res->flags & IORESOURCE_DISABLED) |
d529ac41 | 1043 | p = string_nocheck(p, pend, " disabled", str_spec); |
c7dabef8 | 1044 | } else { |
d529ac41 | 1045 | p = string_nocheck(p, pend, " flags ", str_spec); |
54433973 | 1046 | p = number(p, pend, res->flags, default_flag_spec); |
fd95541e | 1047 | } |
332d2e78 | 1048 | *p++ = ']'; |
c7dabef8 | 1049 | *p = '\0'; |
332d2e78 | 1050 | |
d529ac41 | 1051 | return string_nocheck(buf, end, sym, spec); |
332d2e78 LT |
1052 | } |
1053 | ||
31550a16 AS |
1054 | static noinline_for_stack |
1055 | char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
1056 | const char *fmt) | |
1057 | { | |
360603a1 | 1058 | int i, len = 1; /* if we pass '%ph[CDN]', field width remains |
31550a16 AS |
1059 | negative value, fallback to the default */ |
1060 | char separator; | |
1061 | ||
1062 | if (spec.field_width == 0) | |
1063 | /* nothing to print */ | |
1064 | return buf; | |
1065 | ||
3e5903eb PM |
1066 | if (check_pointer(&buf, end, addr, spec)) |
1067 | return buf; | |
31550a16 AS |
1068 | |
1069 | switch (fmt[1]) { | |
1070 | case 'C': | |
1071 | separator = ':'; | |
1072 | break; | |
1073 | case 'D': | |
1074 | separator = '-'; | |
1075 | break; | |
1076 | case 'N': | |
1077 | separator = 0; | |
1078 | break; | |
1079 | default: | |
1080 | separator = ' '; | |
1081 | break; | |
1082 | } | |
1083 | ||
1084 | if (spec.field_width > 0) | |
1085 | len = min_t(int, spec.field_width, 64); | |
1086 | ||
9c98f235 RV |
1087 | for (i = 0; i < len; ++i) { |
1088 | if (buf < end) | |
1089 | *buf = hex_asc_hi(addr[i]); | |
1090 | ++buf; | |
1091 | if (buf < end) | |
1092 | *buf = hex_asc_lo(addr[i]); | |
1093 | ++buf; | |
31550a16 | 1094 | |
9c98f235 RV |
1095 | if (separator && i != len - 1) { |
1096 | if (buf < end) | |
1097 | *buf = separator; | |
1098 | ++buf; | |
1099 | } | |
31550a16 AS |
1100 | } |
1101 | ||
1102 | return buf; | |
1103 | } | |
1104 | ||
dbc760bc TH |
1105 | static noinline_for_stack |
1106 | char *bitmap_string(char *buf, char *end, unsigned long *bitmap, | |
1107 | struct printf_spec spec, const char *fmt) | |
1108 | { | |
1109 | const int CHUNKSZ = 32; | |
1110 | int nr_bits = max_t(int, spec.field_width, 0); | |
1111 | int i, chunksz; | |
1112 | bool first = true; | |
1113 | ||
3e5903eb PM |
1114 | if (check_pointer(&buf, end, bitmap, spec)) |
1115 | return buf; | |
1116 | ||
dbc760bc TH |
1117 | /* reused to print numbers */ |
1118 | spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 }; | |
1119 | ||
1120 | chunksz = nr_bits & (CHUNKSZ - 1); | |
1121 | if (chunksz == 0) | |
1122 | chunksz = CHUNKSZ; | |
1123 | ||
1124 | i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ; | |
1125 | for (; i >= 0; i -= CHUNKSZ) { | |
1126 | u32 chunkmask, val; | |
1127 | int word, bit; | |
1128 | ||
1129 | chunkmask = ((1ULL << chunksz) - 1); | |
1130 | word = i / BITS_PER_LONG; | |
1131 | bit = i % BITS_PER_LONG; | |
1132 | val = (bitmap[word] >> bit) & chunkmask; | |
1133 | ||
1134 | if (!first) { | |
1135 | if (buf < end) | |
1136 | *buf = ','; | |
1137 | buf++; | |
1138 | } | |
1139 | first = false; | |
1140 | ||
1141 | spec.field_width = DIV_ROUND_UP(chunksz, 4); | |
1142 | buf = number(buf, end, val, spec); | |
1143 | ||
1144 | chunksz = CHUNKSZ; | |
1145 | } | |
1146 | return buf; | |
1147 | } | |
1148 | ||
1149 | static noinline_for_stack | |
1150 | char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap, | |
1151 | struct printf_spec spec, const char *fmt) | |
1152 | { | |
1153 | int nr_bits = max_t(int, spec.field_width, 0); | |
1154 | /* current bit is 'cur', most recently seen range is [rbot, rtop] */ | |
1155 | int cur, rbot, rtop; | |
1156 | bool first = true; | |
1157 | ||
3e5903eb PM |
1158 | if (check_pointer(&buf, end, bitmap, spec)) |
1159 | return buf; | |
1160 | ||
dbc760bc TH |
1161 | rbot = cur = find_first_bit(bitmap, nr_bits); |
1162 | while (cur < nr_bits) { | |
1163 | rtop = cur; | |
1164 | cur = find_next_bit(bitmap, nr_bits, cur + 1); | |
1165 | if (cur < nr_bits && cur <= rtop + 1) | |
1166 | continue; | |
1167 | ||
1168 | if (!first) { | |
1169 | if (buf < end) | |
1170 | *buf = ','; | |
1171 | buf++; | |
1172 | } | |
1173 | first = false; | |
1174 | ||
ce0b4910 | 1175 | buf = number(buf, end, rbot, default_dec_spec); |
dbc760bc TH |
1176 | if (rbot < rtop) { |
1177 | if (buf < end) | |
1178 | *buf = '-'; | |
1179 | buf++; | |
1180 | ||
ce0b4910 | 1181 | buf = number(buf, end, rtop, default_dec_spec); |
dbc760bc TH |
1182 | } |
1183 | ||
1184 | rbot = cur; | |
1185 | } | |
1186 | return buf; | |
1187 | } | |
1188 | ||
cf3b429b JP |
1189 | static noinline_for_stack |
1190 | char *mac_address_string(char *buf, char *end, u8 *addr, | |
1191 | struct printf_spec spec, const char *fmt) | |
dd45c9cf | 1192 | { |
8a27f7c9 | 1193 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; |
dd45c9cf HH |
1194 | char *p = mac_addr; |
1195 | int i; | |
bc7259a2 | 1196 | char separator; |
76597ff9 | 1197 | bool reversed = false; |
bc7259a2 | 1198 | |
3e5903eb PM |
1199 | if (check_pointer(&buf, end, addr, spec)) |
1200 | return buf; | |
1201 | ||
76597ff9 AE |
1202 | switch (fmt[1]) { |
1203 | case 'F': | |
bc7259a2 | 1204 | separator = '-'; |
76597ff9 AE |
1205 | break; |
1206 | ||
1207 | case 'R': | |
1208 | reversed = true; | |
1209 | /* fall through */ | |
1210 | ||
1211 | default: | |
bc7259a2 | 1212 | separator = ':'; |
76597ff9 | 1213 | break; |
bc7259a2 | 1214 | } |
dd45c9cf HH |
1215 | |
1216 | for (i = 0; i < 6; i++) { | |
76597ff9 AE |
1217 | if (reversed) |
1218 | p = hex_byte_pack(p, addr[5 - i]); | |
1219 | else | |
1220 | p = hex_byte_pack(p, addr[i]); | |
1221 | ||
8a27f7c9 | 1222 | if (fmt[0] == 'M' && i != 5) |
bc7259a2 | 1223 | *p++ = separator; |
dd45c9cf HH |
1224 | } |
1225 | *p = '\0'; | |
1226 | ||
d529ac41 | 1227 | return string_nocheck(buf, end, mac_addr, spec); |
dd45c9cf HH |
1228 | } |
1229 | ||
cf3b429b JP |
1230 | static noinline_for_stack |
1231 | char *ip4_string(char *p, const u8 *addr, const char *fmt) | |
8a27f7c9 JP |
1232 | { |
1233 | int i; | |
0159f24e JP |
1234 | bool leading_zeros = (fmt[0] == 'i'); |
1235 | int index; | |
1236 | int step; | |
1237 | ||
1238 | switch (fmt[2]) { | |
1239 | case 'h': | |
1240 | #ifdef __BIG_ENDIAN | |
1241 | index = 0; | |
1242 | step = 1; | |
1243 | #else | |
1244 | index = 3; | |
1245 | step = -1; | |
1246 | #endif | |
1247 | break; | |
1248 | case 'l': | |
1249 | index = 3; | |
1250 | step = -1; | |
1251 | break; | |
1252 | case 'n': | |
1253 | case 'b': | |
1254 | default: | |
1255 | index = 0; | |
1256 | step = 1; | |
1257 | break; | |
1258 | } | |
8a27f7c9 | 1259 | for (i = 0; i < 4; i++) { |
7c43d9a3 | 1260 | char temp[4] __aligned(2); /* hold each IP quad in reverse order */ |
133fd9f5 | 1261 | int digits = put_dec_trunc8(temp, addr[index]) - temp; |
8a27f7c9 JP |
1262 | if (leading_zeros) { |
1263 | if (digits < 3) | |
1264 | *p++ = '0'; | |
1265 | if (digits < 2) | |
1266 | *p++ = '0'; | |
1267 | } | |
1268 | /* reverse the digits in the quad */ | |
1269 | while (digits--) | |
1270 | *p++ = temp[digits]; | |
1271 | if (i < 3) | |
1272 | *p++ = '.'; | |
0159f24e | 1273 | index += step; |
8a27f7c9 | 1274 | } |
8a27f7c9 | 1275 | *p = '\0'; |
7b9186f5 | 1276 | |
8a27f7c9 JP |
1277 | return p; |
1278 | } | |
1279 | ||
cf3b429b JP |
1280 | static noinline_for_stack |
1281 | char *ip6_compressed_string(char *p, const char *addr) | |
689afa7d | 1282 | { |
7b9186f5 | 1283 | int i, j, range; |
8a27f7c9 JP |
1284 | unsigned char zerolength[8]; |
1285 | int longest = 1; | |
1286 | int colonpos = -1; | |
1287 | u16 word; | |
7b9186f5 | 1288 | u8 hi, lo; |
8a27f7c9 | 1289 | bool needcolon = false; |
eb78cd26 JP |
1290 | bool useIPv4; |
1291 | struct in6_addr in6; | |
1292 | ||
1293 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
1294 | ||
1295 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
8a27f7c9 JP |
1296 | |
1297 | memset(zerolength, 0, sizeof(zerolength)); | |
1298 | ||
1299 | if (useIPv4) | |
1300 | range = 6; | |
1301 | else | |
1302 | range = 8; | |
1303 | ||
1304 | /* find position of longest 0 run */ | |
1305 | for (i = 0; i < range; i++) { | |
1306 | for (j = i; j < range; j++) { | |
eb78cd26 | 1307 | if (in6.s6_addr16[j] != 0) |
8a27f7c9 JP |
1308 | break; |
1309 | zerolength[i]++; | |
1310 | } | |
1311 | } | |
1312 | for (i = 0; i < range; i++) { | |
1313 | if (zerolength[i] > longest) { | |
1314 | longest = zerolength[i]; | |
1315 | colonpos = i; | |
1316 | } | |
1317 | } | |
29cf519e JP |
1318 | if (longest == 1) /* don't compress a single 0 */ |
1319 | colonpos = -1; | |
689afa7d | 1320 | |
8a27f7c9 JP |
1321 | /* emit address */ |
1322 | for (i = 0; i < range; i++) { | |
1323 | if (i == colonpos) { | |
1324 | if (needcolon || i == 0) | |
1325 | *p++ = ':'; | |
1326 | *p++ = ':'; | |
1327 | needcolon = false; | |
1328 | i += longest - 1; | |
1329 | continue; | |
1330 | } | |
1331 | if (needcolon) { | |
1332 | *p++ = ':'; | |
1333 | needcolon = false; | |
1334 | } | |
1335 | /* hex u16 without leading 0s */ | |
eb78cd26 | 1336 | word = ntohs(in6.s6_addr16[i]); |
8a27f7c9 JP |
1337 | hi = word >> 8; |
1338 | lo = word & 0xff; | |
1339 | if (hi) { | |
1340 | if (hi > 0x0f) | |
55036ba7 | 1341 | p = hex_byte_pack(p, hi); |
8a27f7c9 JP |
1342 | else |
1343 | *p++ = hex_asc_lo(hi); | |
55036ba7 | 1344 | p = hex_byte_pack(p, lo); |
8a27f7c9 | 1345 | } |
b5ff992b | 1346 | else if (lo > 0x0f) |
55036ba7 | 1347 | p = hex_byte_pack(p, lo); |
8a27f7c9 JP |
1348 | else |
1349 | *p++ = hex_asc_lo(lo); | |
1350 | needcolon = true; | |
1351 | } | |
1352 | ||
1353 | if (useIPv4) { | |
1354 | if (needcolon) | |
1355 | *p++ = ':'; | |
0159f24e | 1356 | p = ip4_string(p, &in6.s6_addr[12], "I4"); |
8a27f7c9 | 1357 | } |
8a27f7c9 | 1358 | *p = '\0'; |
7b9186f5 | 1359 | |
8a27f7c9 JP |
1360 | return p; |
1361 | } | |
1362 | ||
cf3b429b JP |
1363 | static noinline_for_stack |
1364 | char *ip6_string(char *p, const char *addr, const char *fmt) | |
8a27f7c9 JP |
1365 | { |
1366 | int i; | |
7b9186f5 | 1367 | |
689afa7d | 1368 | for (i = 0; i < 8; i++) { |
55036ba7 AS |
1369 | p = hex_byte_pack(p, *addr++); |
1370 | p = hex_byte_pack(p, *addr++); | |
8a27f7c9 | 1371 | if (fmt[0] == 'I' && i != 7) |
689afa7d HH |
1372 | *p++ = ':'; |
1373 | } | |
1374 | *p = '\0'; | |
7b9186f5 | 1375 | |
8a27f7c9 JP |
1376 | return p; |
1377 | } | |
1378 | ||
cf3b429b JP |
1379 | static noinline_for_stack |
1380 | char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
1381 | struct printf_spec spec, const char *fmt) | |
8a27f7c9 JP |
1382 | { |
1383 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
1384 | ||
1385 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
eb78cd26 | 1386 | ip6_compressed_string(ip6_addr, addr); |
8a27f7c9 | 1387 | else |
eb78cd26 | 1388 | ip6_string(ip6_addr, addr, fmt); |
689afa7d | 1389 | |
d529ac41 | 1390 | return string_nocheck(buf, end, ip6_addr, spec); |
689afa7d HH |
1391 | } |
1392 | ||
cf3b429b JP |
1393 | static noinline_for_stack |
1394 | char *ip4_addr_string(char *buf, char *end, const u8 *addr, | |
1395 | struct printf_spec spec, const char *fmt) | |
4aa99606 | 1396 | { |
8a27f7c9 | 1397 | char ip4_addr[sizeof("255.255.255.255")]; |
4aa99606 | 1398 | |
0159f24e | 1399 | ip4_string(ip4_addr, addr, fmt); |
4aa99606 | 1400 | |
d529ac41 | 1401 | return string_nocheck(buf, end, ip4_addr, spec); |
4aa99606 HH |
1402 | } |
1403 | ||
10679643 DB |
1404 | static noinline_for_stack |
1405 | char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa, | |
1406 | struct printf_spec spec, const char *fmt) | |
1407 | { | |
1408 | bool have_p = false, have_s = false, have_f = false, have_c = false; | |
1409 | char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") + | |
1410 | sizeof(":12345") + sizeof("/123456789") + | |
1411 | sizeof("%1234567890")]; | |
1412 | char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr); | |
1413 | const u8 *addr = (const u8 *) &sa->sin6_addr; | |
1414 | char fmt6[2] = { fmt[0], '6' }; | |
1415 | u8 off = 0; | |
1416 | ||
1417 | fmt++; | |
1418 | while (isalpha(*++fmt)) { | |
1419 | switch (*fmt) { | |
1420 | case 'p': | |
1421 | have_p = true; | |
1422 | break; | |
1423 | case 'f': | |
1424 | have_f = true; | |
1425 | break; | |
1426 | case 's': | |
1427 | have_s = true; | |
1428 | break; | |
1429 | case 'c': | |
1430 | have_c = true; | |
1431 | break; | |
1432 | } | |
1433 | } | |
1434 | ||
1435 | if (have_p || have_s || have_f) { | |
1436 | *p = '['; | |
1437 | off = 1; | |
1438 | } | |
1439 | ||
1440 | if (fmt6[0] == 'I' && have_c) | |
1441 | p = ip6_compressed_string(ip6_addr + off, addr); | |
1442 | else | |
1443 | p = ip6_string(ip6_addr + off, addr, fmt6); | |
1444 | ||
1445 | if (have_p || have_s || have_f) | |
1446 | *p++ = ']'; | |
1447 | ||
1448 | if (have_p) { | |
1449 | *p++ = ':'; | |
1450 | p = number(p, pend, ntohs(sa->sin6_port), spec); | |
1451 | } | |
1452 | if (have_f) { | |
1453 | *p++ = '/'; | |
1454 | p = number(p, pend, ntohl(sa->sin6_flowinfo & | |
1455 | IPV6_FLOWINFO_MASK), spec); | |
1456 | } | |
1457 | if (have_s) { | |
1458 | *p++ = '%'; | |
1459 | p = number(p, pend, sa->sin6_scope_id, spec); | |
1460 | } | |
1461 | *p = '\0'; | |
1462 | ||
d529ac41 | 1463 | return string_nocheck(buf, end, ip6_addr, spec); |
10679643 DB |
1464 | } |
1465 | ||
1466 | static noinline_for_stack | |
1467 | char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa, | |
1468 | struct printf_spec spec, const char *fmt) | |
1469 | { | |
1470 | bool have_p = false; | |
1471 | char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")]; | |
1472 | char *pend = ip4_addr + sizeof(ip4_addr); | |
1473 | const u8 *addr = (const u8 *) &sa->sin_addr.s_addr; | |
1474 | char fmt4[3] = { fmt[0], '4', 0 }; | |
1475 | ||
1476 | fmt++; | |
1477 | while (isalpha(*++fmt)) { | |
1478 | switch (*fmt) { | |
1479 | case 'p': | |
1480 | have_p = true; | |
1481 | break; | |
1482 | case 'h': | |
1483 | case 'l': | |
1484 | case 'n': | |
1485 | case 'b': | |
1486 | fmt4[2] = *fmt; | |
1487 | break; | |
1488 | } | |
1489 | } | |
1490 | ||
1491 | p = ip4_string(ip4_addr, addr, fmt4); | |
1492 | if (have_p) { | |
1493 | *p++ = ':'; | |
1494 | p = number(p, pend, ntohs(sa->sin_port), spec); | |
1495 | } | |
1496 | *p = '\0'; | |
1497 | ||
d529ac41 | 1498 | return string_nocheck(buf, end, ip4_addr, spec); |
10679643 DB |
1499 | } |
1500 | ||
f00cc102 PM |
1501 | static noinline_for_stack |
1502 | char *ip_addr_string(char *buf, char *end, const void *ptr, | |
1503 | struct printf_spec spec, const char *fmt) | |
1504 | { | |
0b74d4d7 PM |
1505 | char *err_fmt_msg; |
1506 | ||
3e5903eb PM |
1507 | if (check_pointer(&buf, end, ptr, spec)) |
1508 | return buf; | |
1509 | ||
f00cc102 PM |
1510 | switch (fmt[1]) { |
1511 | case '6': | |
1512 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
1513 | case '4': | |
1514 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
1515 | case 'S': { | |
1516 | const union { | |
1517 | struct sockaddr raw; | |
1518 | struct sockaddr_in v4; | |
1519 | struct sockaddr_in6 v6; | |
1520 | } *sa = ptr; | |
1521 | ||
1522 | switch (sa->raw.sa_family) { | |
1523 | case AF_INET: | |
1524 | return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt); | |
1525 | case AF_INET6: | |
1526 | return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt); | |
1527 | default: | |
c8c3b584 | 1528 | return error_string(buf, end, "(einval)", spec); |
f00cc102 PM |
1529 | }} |
1530 | } | |
1531 | ||
0b74d4d7 | 1532 | err_fmt_msg = fmt[0] == 'i' ? "(%pi?)" : "(%pI?)"; |
c8c3b584 | 1533 | return error_string(buf, end, err_fmt_msg, spec); |
f00cc102 PM |
1534 | } |
1535 | ||
71dca95d AS |
1536 | static noinline_for_stack |
1537 | char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
1538 | const char *fmt) | |
1539 | { | |
1540 | bool found = true; | |
1541 | int count = 1; | |
1542 | unsigned int flags = 0; | |
1543 | int len; | |
1544 | ||
1545 | if (spec.field_width == 0) | |
1546 | return buf; /* nothing to print */ | |
1547 | ||
3e5903eb PM |
1548 | if (check_pointer(&buf, end, addr, spec)) |
1549 | return buf; | |
71dca95d AS |
1550 | |
1551 | do { | |
1552 | switch (fmt[count++]) { | |
1553 | case 'a': | |
1554 | flags |= ESCAPE_ANY; | |
1555 | break; | |
1556 | case 'c': | |
1557 | flags |= ESCAPE_SPECIAL; | |
1558 | break; | |
1559 | case 'h': | |
1560 | flags |= ESCAPE_HEX; | |
1561 | break; | |
1562 | case 'n': | |
1563 | flags |= ESCAPE_NULL; | |
1564 | break; | |
1565 | case 'o': | |
1566 | flags |= ESCAPE_OCTAL; | |
1567 | break; | |
1568 | case 'p': | |
1569 | flags |= ESCAPE_NP; | |
1570 | break; | |
1571 | case 's': | |
1572 | flags |= ESCAPE_SPACE; | |
1573 | break; | |
1574 | default: | |
1575 | found = false; | |
1576 | break; | |
1577 | } | |
1578 | } while (found); | |
1579 | ||
1580 | if (!flags) | |
1581 | flags = ESCAPE_ANY_NP; | |
1582 | ||
1583 | len = spec.field_width < 0 ? 1 : spec.field_width; | |
1584 | ||
41416f23 RV |
1585 | /* |
1586 | * string_escape_mem() writes as many characters as it can to | |
1587 | * the given buffer, and returns the total size of the output | |
1588 | * had the buffer been big enough. | |
1589 | */ | |
1590 | buf += string_escape_mem(addr, len, buf, buf < end ? end - buf : 0, flags, NULL); | |
71dca95d AS |
1591 | |
1592 | return buf; | |
1593 | } | |
1594 | ||
3e5903eb PM |
1595 | static char *va_format(char *buf, char *end, struct va_format *va_fmt, |
1596 | struct printf_spec spec, const char *fmt) | |
45c3e93d PM |
1597 | { |
1598 | va_list va; | |
1599 | ||
3e5903eb PM |
1600 | if (check_pointer(&buf, end, va_fmt, spec)) |
1601 | return buf; | |
1602 | ||
45c3e93d PM |
1603 | va_copy(va, *va_fmt->va); |
1604 | buf += vsnprintf(buf, end > buf ? end - buf : 0, va_fmt->fmt, va); | |
1605 | va_end(va); | |
1606 | ||
1607 | return buf; | |
1608 | } | |
1609 | ||
cf3b429b JP |
1610 | static noinline_for_stack |
1611 | char *uuid_string(char *buf, char *end, const u8 *addr, | |
1612 | struct printf_spec spec, const char *fmt) | |
9ac6e44e | 1613 | { |
2b1b0d66 | 1614 | char uuid[UUID_STRING_LEN + 1]; |
9ac6e44e JP |
1615 | char *p = uuid; |
1616 | int i; | |
f9727a17 | 1617 | const u8 *index = uuid_index; |
9ac6e44e JP |
1618 | bool uc = false; |
1619 | ||
3e5903eb PM |
1620 | if (check_pointer(&buf, end, addr, spec)) |
1621 | return buf; | |
1622 | ||
9ac6e44e JP |
1623 | switch (*(++fmt)) { |
1624 | case 'L': | |
1625 | uc = true; /* fall-through */ | |
1626 | case 'l': | |
f9727a17 | 1627 | index = guid_index; |
9ac6e44e JP |
1628 | break; |
1629 | case 'B': | |
1630 | uc = true; | |
1631 | break; | |
1632 | } | |
1633 | ||
1634 | for (i = 0; i < 16; i++) { | |
aa4ea1c3 AS |
1635 | if (uc) |
1636 | p = hex_byte_pack_upper(p, addr[index[i]]); | |
1637 | else | |
1638 | p = hex_byte_pack(p, addr[index[i]]); | |
9ac6e44e JP |
1639 | switch (i) { |
1640 | case 3: | |
1641 | case 5: | |
1642 | case 7: | |
1643 | case 9: | |
1644 | *p++ = '-'; | |
1645 | break; | |
1646 | } | |
1647 | } | |
1648 | ||
1649 | *p = 0; | |
1650 | ||
d529ac41 | 1651 | return string_nocheck(buf, end, uuid, spec); |
9ac6e44e JP |
1652 | } |
1653 | ||
5b17aecf | 1654 | static noinline_for_stack |
431bca24 GU |
1655 | char *netdev_bits(char *buf, char *end, const void *addr, |
1656 | struct printf_spec spec, const char *fmt) | |
c8f44aff | 1657 | { |
5b17aecf AS |
1658 | unsigned long long num; |
1659 | int size; | |
1660 | ||
3e5903eb PM |
1661 | if (check_pointer(&buf, end, addr, spec)) |
1662 | return buf; | |
1663 | ||
5b17aecf AS |
1664 | switch (fmt[1]) { |
1665 | case 'F': | |
1666 | num = *(const netdev_features_t *)addr; | |
1667 | size = sizeof(netdev_features_t); | |
1668 | break; | |
1669 | default: | |
c8c3b584 | 1670 | return error_string(buf, end, "(%pN?)", spec); |
5b17aecf | 1671 | } |
c8f44aff | 1672 | |
3cab1e71 | 1673 | return special_hex_number(buf, end, num, size); |
c8f44aff MM |
1674 | } |
1675 | ||
aaf07621 | 1676 | static noinline_for_stack |
3e5903eb PM |
1677 | char *address_val(char *buf, char *end, const void *addr, |
1678 | struct printf_spec spec, const char *fmt) | |
aaf07621 JP |
1679 | { |
1680 | unsigned long long num; | |
3cab1e71 | 1681 | int size; |
aaf07621 | 1682 | |
3e5903eb PM |
1683 | if (check_pointer(&buf, end, addr, spec)) |
1684 | return buf; | |
1685 | ||
aaf07621 JP |
1686 | switch (fmt[1]) { |
1687 | case 'd': | |
1688 | num = *(const dma_addr_t *)addr; | |
3cab1e71 | 1689 | size = sizeof(dma_addr_t); |
aaf07621 JP |
1690 | break; |
1691 | case 'p': | |
1692 | default: | |
1693 | num = *(const phys_addr_t *)addr; | |
3cab1e71 | 1694 | size = sizeof(phys_addr_t); |
aaf07621 JP |
1695 | break; |
1696 | } | |
1697 | ||
3cab1e71 | 1698 | return special_hex_number(buf, end, num, size); |
aaf07621 JP |
1699 | } |
1700 | ||
4d42c447 AS |
1701 | static noinline_for_stack |
1702 | char *date_str(char *buf, char *end, const struct rtc_time *tm, bool r) | |
1703 | { | |
1704 | int year = tm->tm_year + (r ? 0 : 1900); | |
1705 | int mon = tm->tm_mon + (r ? 0 : 1); | |
1706 | ||
1707 | buf = number(buf, end, year, default_dec04_spec); | |
1708 | if (buf < end) | |
1709 | *buf = '-'; | |
1710 | buf++; | |
1711 | ||
1712 | buf = number(buf, end, mon, default_dec02_spec); | |
1713 | if (buf < end) | |
1714 | *buf = '-'; | |
1715 | buf++; | |
1716 | ||
1717 | return number(buf, end, tm->tm_mday, default_dec02_spec); | |
1718 | } | |
1719 | ||
1720 | static noinline_for_stack | |
1721 | char *time_str(char *buf, char *end, const struct rtc_time *tm, bool r) | |
1722 | { | |
1723 | buf = number(buf, end, tm->tm_hour, default_dec02_spec); | |
1724 | if (buf < end) | |
1725 | *buf = ':'; | |
1726 | buf++; | |
1727 | ||
1728 | buf = number(buf, end, tm->tm_min, default_dec02_spec); | |
1729 | if (buf < end) | |
1730 | *buf = ':'; | |
1731 | buf++; | |
1732 | ||
1733 | return number(buf, end, tm->tm_sec, default_dec02_spec); | |
1734 | } | |
1735 | ||
1736 | static noinline_for_stack | |
3e5903eb PM |
1737 | char *rtc_str(char *buf, char *end, const struct rtc_time *tm, |
1738 | struct printf_spec spec, const char *fmt) | |
4d42c447 AS |
1739 | { |
1740 | bool have_t = true, have_d = true; | |
1741 | bool raw = false; | |
1742 | int count = 2; | |
1743 | ||
3e5903eb PM |
1744 | if (check_pointer(&buf, end, tm, spec)) |
1745 | return buf; | |
1746 | ||
4d42c447 AS |
1747 | switch (fmt[count]) { |
1748 | case 'd': | |
1749 | have_t = false; | |
1750 | count++; | |
1751 | break; | |
1752 | case 't': | |
1753 | have_d = false; | |
1754 | count++; | |
1755 | break; | |
1756 | } | |
1757 | ||
1758 | raw = fmt[count] == 'r'; | |
1759 | ||
1760 | if (have_d) | |
1761 | buf = date_str(buf, end, tm, raw); | |
1762 | if (have_d && have_t) { | |
1763 | /* Respect ISO 8601 */ | |
1764 | if (buf < end) | |
1765 | *buf = 'T'; | |
1766 | buf++; | |
1767 | } | |
1768 | if (have_t) | |
1769 | buf = time_str(buf, end, tm, raw); | |
1770 | ||
1771 | return buf; | |
1772 | } | |
1773 | ||
1774 | static noinline_for_stack | |
1775 | char *time_and_date(char *buf, char *end, void *ptr, struct printf_spec spec, | |
1776 | const char *fmt) | |
1777 | { | |
1778 | switch (fmt[1]) { | |
1779 | case 'R': | |
3e5903eb | 1780 | return rtc_str(buf, end, (const struct rtc_time *)ptr, spec, fmt); |
4d42c447 | 1781 | default: |
c8c3b584 | 1782 | return error_string(buf, end, "(%ptR?)", spec); |
4d42c447 AS |
1783 | } |
1784 | } | |
1785 | ||
900cca29 GU |
1786 | static noinline_for_stack |
1787 | char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec, | |
1788 | const char *fmt) | |
1789 | { | |
0b74d4d7 | 1790 | if (!IS_ENABLED(CONFIG_HAVE_CLK)) |
c8c3b584 | 1791 | return error_string(buf, end, "(%pC?)", spec); |
0b74d4d7 | 1792 | |
3e5903eb PM |
1793 | if (check_pointer(&buf, end, clk, spec)) |
1794 | return buf; | |
900cca29 GU |
1795 | |
1796 | switch (fmt[1]) { | |
900cca29 GU |
1797 | case 'n': |
1798 | default: | |
1799 | #ifdef CONFIG_COMMON_CLK | |
1800 | return string(buf, end, __clk_get_name(clk), spec); | |
1801 | #else | |
4ca96aa9 | 1802 | return ptr_to_id(buf, end, clk, spec); |
900cca29 GU |
1803 | #endif |
1804 | } | |
1805 | } | |
1806 | ||
edf14cdb VB |
1807 | static |
1808 | char *format_flags(char *buf, char *end, unsigned long flags, | |
1809 | const struct trace_print_flags *names) | |
1810 | { | |
1811 | unsigned long mask; | |
edf14cdb VB |
1812 | |
1813 | for ( ; flags && names->name; names++) { | |
1814 | mask = names->mask; | |
1815 | if ((flags & mask) != mask) | |
1816 | continue; | |
1817 | ||
abd4fe62 | 1818 | buf = string(buf, end, names->name, default_str_spec); |
edf14cdb VB |
1819 | |
1820 | flags &= ~mask; | |
1821 | if (flags) { | |
1822 | if (buf < end) | |
1823 | *buf = '|'; | |
1824 | buf++; | |
1825 | } | |
1826 | } | |
1827 | ||
1828 | if (flags) | |
54433973 | 1829 | buf = number(buf, end, flags, default_flag_spec); |
edf14cdb VB |
1830 | |
1831 | return buf; | |
1832 | } | |
1833 | ||
1834 | static noinline_for_stack | |
0b74d4d7 PM |
1835 | char *flags_string(char *buf, char *end, void *flags_ptr, |
1836 | struct printf_spec spec, const char *fmt) | |
edf14cdb VB |
1837 | { |
1838 | unsigned long flags; | |
1839 | const struct trace_print_flags *names; | |
1840 | ||
3e5903eb PM |
1841 | if (check_pointer(&buf, end, flags_ptr, spec)) |
1842 | return buf; | |
1843 | ||
edf14cdb VB |
1844 | switch (fmt[1]) { |
1845 | case 'p': | |
1846 | flags = *(unsigned long *)flags_ptr; | |
1847 | /* Remove zone id */ | |
1848 | flags &= (1UL << NR_PAGEFLAGS) - 1; | |
1849 | names = pageflag_names; | |
1850 | break; | |
1851 | case 'v': | |
1852 | flags = *(unsigned long *)flags_ptr; | |
1853 | names = vmaflag_names; | |
1854 | break; | |
1855 | case 'g': | |
1856 | flags = *(gfp_t *)flags_ptr; | |
1857 | names = gfpflag_names; | |
1858 | break; | |
1859 | default: | |
c8c3b584 | 1860 | return error_string(buf, end, "(%pG?)", spec); |
edf14cdb VB |
1861 | } |
1862 | ||
1863 | return format_flags(buf, end, flags, names); | |
1864 | } | |
1865 | ||
ce4fecf1 PA |
1866 | static const char *device_node_name_for_depth(const struct device_node *np, int depth) |
1867 | { | |
1868 | for ( ; np && depth; depth--) | |
1869 | np = np->parent; | |
1870 | ||
1871 | return kbasename(np->full_name); | |
1872 | } | |
1873 | ||
1874 | static noinline_for_stack | |
1875 | char *device_node_gen_full_name(const struct device_node *np, char *buf, char *end) | |
1876 | { | |
1877 | int depth; | |
1878 | const struct device_node *parent = np->parent; | |
ce4fecf1 PA |
1879 | |
1880 | /* special case for root node */ | |
1881 | if (!parent) | |
d529ac41 | 1882 | return string_nocheck(buf, end, "/", default_str_spec); |
ce4fecf1 PA |
1883 | |
1884 | for (depth = 0; parent->parent; depth++) | |
1885 | parent = parent->parent; | |
1886 | ||
1887 | for ( ; depth >= 0; depth--) { | |
d529ac41 | 1888 | buf = string_nocheck(buf, end, "/", default_str_spec); |
ce4fecf1 | 1889 | buf = string(buf, end, device_node_name_for_depth(np, depth), |
abd4fe62 | 1890 | default_str_spec); |
ce4fecf1 PA |
1891 | } |
1892 | return buf; | |
1893 | } | |
1894 | ||
1895 | static noinline_for_stack | |
1896 | char *device_node_string(char *buf, char *end, struct device_node *dn, | |
1897 | struct printf_spec spec, const char *fmt) | |
1898 | { | |
1899 | char tbuf[sizeof("xxxx") + 1]; | |
1900 | const char *p; | |
1901 | int ret; | |
1902 | char *buf_start = buf; | |
1903 | struct property *prop; | |
1904 | bool has_mult, pass; | |
1905 | static const struct printf_spec num_spec = { | |
1906 | .flags = SMALL, | |
1907 | .field_width = -1, | |
1908 | .precision = -1, | |
1909 | .base = 10, | |
1910 | }; | |
1911 | ||
1912 | struct printf_spec str_spec = spec; | |
1913 | str_spec.field_width = -1; | |
1914 | ||
1915 | if (!IS_ENABLED(CONFIG_OF)) | |
c8c3b584 | 1916 | return error_string(buf, end, "(%pOF?)", spec); |
ce4fecf1 | 1917 | |
3e5903eb PM |
1918 | if (check_pointer(&buf, end, dn, spec)) |
1919 | return buf; | |
ce4fecf1 PA |
1920 | |
1921 | /* simple case without anything any more format specifiers */ | |
1922 | fmt++; | |
1923 | if (fmt[0] == '\0' || strcspn(fmt,"fnpPFcC") > 0) | |
1924 | fmt = "f"; | |
1925 | ||
1926 | for (pass = false; strspn(fmt,"fnpPFcC"); fmt++, pass = true) { | |
6d0a70a2 | 1927 | int precision; |
ce4fecf1 PA |
1928 | if (pass) { |
1929 | if (buf < end) | |
1930 | *buf = ':'; | |
1931 | buf++; | |
1932 | } | |
1933 | ||
1934 | switch (*fmt) { | |
1935 | case 'f': /* full_name */ | |
1936 | buf = device_node_gen_full_name(dn, buf, end); | |
1937 | break; | |
1938 | case 'n': /* name */ | |
6d0a70a2 RH |
1939 | p = kbasename(of_node_full_name(dn)); |
1940 | precision = str_spec.precision; | |
1941 | str_spec.precision = strchrnul(p, '@') - p; | |
1942 | buf = string(buf, end, p, str_spec); | |
1943 | str_spec.precision = precision; | |
ce4fecf1 PA |
1944 | break; |
1945 | case 'p': /* phandle */ | |
1946 | buf = number(buf, end, (unsigned int)dn->phandle, num_spec); | |
1947 | break; | |
1948 | case 'P': /* path-spec */ | |
1949 | p = kbasename(of_node_full_name(dn)); | |
1950 | if (!p[1]) | |
1951 | p = "/"; | |
1952 | buf = string(buf, end, p, str_spec); | |
1953 | break; | |
1954 | case 'F': /* flags */ | |
1955 | tbuf[0] = of_node_check_flag(dn, OF_DYNAMIC) ? 'D' : '-'; | |
1956 | tbuf[1] = of_node_check_flag(dn, OF_DETACHED) ? 'd' : '-'; | |
1957 | tbuf[2] = of_node_check_flag(dn, OF_POPULATED) ? 'P' : '-'; | |
1958 | tbuf[3] = of_node_check_flag(dn, OF_POPULATED_BUS) ? 'B' : '-'; | |
1959 | tbuf[4] = 0; | |
d529ac41 | 1960 | buf = string_nocheck(buf, end, tbuf, str_spec); |
ce4fecf1 PA |
1961 | break; |
1962 | case 'c': /* major compatible string */ | |
1963 | ret = of_property_read_string(dn, "compatible", &p); | |
1964 | if (!ret) | |
1965 | buf = string(buf, end, p, str_spec); | |
1966 | break; | |
1967 | case 'C': /* full compatible string */ | |
1968 | has_mult = false; | |
1969 | of_property_for_each_string(dn, "compatible", prop, p) { | |
1970 | if (has_mult) | |
d529ac41 PM |
1971 | buf = string_nocheck(buf, end, ",", str_spec); |
1972 | buf = string_nocheck(buf, end, "\"", str_spec); | |
ce4fecf1 | 1973 | buf = string(buf, end, p, str_spec); |
d529ac41 | 1974 | buf = string_nocheck(buf, end, "\"", str_spec); |
ce4fecf1 PA |
1975 | |
1976 | has_mult = true; | |
1977 | } | |
1978 | break; | |
1979 | default: | |
1980 | break; | |
1981 | } | |
1982 | } | |
1983 | ||
1984 | return widen_string(buf, buf - buf_start, end, spec); | |
1985 | } | |
1986 | ||
798cc27a PM |
1987 | static char *kobject_string(char *buf, char *end, void *ptr, |
1988 | struct printf_spec spec, const char *fmt) | |
1989 | { | |
1990 | switch (fmt[1]) { | |
1991 | case 'F': | |
1992 | return device_node_string(buf, end, ptr, spec, fmt + 1); | |
1993 | } | |
1994 | ||
c8c3b584 | 1995 | return error_string(buf, end, "(%pO?)", spec); |
798cc27a PM |
1996 | } |
1997 | ||
4d8a743c LT |
1998 | /* |
1999 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
2000 | * by an extra set of alphanumeric characters that are extended format | |
2001 | * specifiers. | |
2002 | * | |
0b523769 JP |
2003 | * Please update scripts/checkpatch.pl when adding/removing conversion |
2004 | * characters. (Search for "check for vsprintf extension"). | |
2005 | * | |
332d2e78 LT |
2006 | * Right now we handle: |
2007 | * | |
cdb7e52d SS |
2008 | * - 'S' For symbolic direct pointers (or function descriptors) with offset |
2009 | * - 's' For symbolic direct pointers (or function descriptors) without offset | |
2010 | * - 'F' Same as 'S' | |
2011 | * - 'f' Same as 's' | |
b0d33c2b | 2012 | * - '[FfSs]R' as above with __builtin_extract_return_addr() translation |
0f77a8d3 | 2013 | * - 'B' For backtraced symbolic direct pointers with offset |
c7dabef8 BH |
2014 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] |
2015 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] | |
dbc760bc TH |
2016 | * - 'b[l]' For a bitmap, the number of bits is determined by the field |
2017 | * width which must be explicitly specified either as part of the | |
2018 | * format string '%32b[l]' or through '%*b[l]', [l] selects | |
2019 | * range-list format instead of hex format | |
dd45c9cf HH |
2020 | * - 'M' For a 6-byte MAC address, it prints the address in the |
2021 | * usual colon-separated hex notation | |
8a27f7c9 | 2022 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons |
bc7259a2 | 2023 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address |
c8e00060 | 2024 | * with a dash-separated hex notation |
7c59154e | 2025 | * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth) |
8a27f7c9 JP |
2026 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way |
2027 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
2028 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
10679643 DB |
2029 | * [S][pfs] |
2030 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
2031 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
8a27f7c9 JP |
2032 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses |
2033 | * IPv6 omits the colons (01020304...0f) | |
2034 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
10679643 DB |
2035 | * [S][pfs] |
2036 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
2037 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
2038 | * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order | |
2039 | * - 'I[6S]c' for IPv6 addresses printed as specified by | |
29cf519e | 2040 | * http://tools.ietf.org/html/rfc5952 |
71dca95d AS |
2041 | * - 'E[achnops]' For an escaped buffer, where rules are defined by combination |
2042 | * of the following flags (see string_escape_mem() for the | |
2043 | * details): | |
2044 | * a - ESCAPE_ANY | |
2045 | * c - ESCAPE_SPECIAL | |
2046 | * h - ESCAPE_HEX | |
2047 | * n - ESCAPE_NULL | |
2048 | * o - ESCAPE_OCTAL | |
2049 | * p - ESCAPE_NP | |
2050 | * s - ESCAPE_SPACE | |
2051 | * By default ESCAPE_ANY_NP is used. | |
9ac6e44e JP |
2052 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form |
2053 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" | |
2054 | * Options for %pU are: | |
2055 | * b big endian lower case hex (default) | |
2056 | * B big endian UPPER case hex | |
2057 | * l little endian lower case hex | |
2058 | * L little endian UPPER case hex | |
2059 | * big endian output byte order is: | |
2060 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] | |
2061 | * little endian output byte order is: | |
2062 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] | |
7db6f5fb JP |
2063 | * - 'V' For a struct va_format which contains a format string * and va_list *, |
2064 | * call vsnprintf(->format, *->va_list). | |
2065 | * Implements a "recursive vsnprintf". | |
2066 | * Do not use this feature without some mechanism to verify the | |
2067 | * correctness of the format string and va_list arguments. | |
455cd5ab | 2068 | * - 'K' For a kernel pointer that should be hidden from unprivileged users |
c8f44aff | 2069 | * - 'NF' For a netdev_features_t |
31550a16 AS |
2070 | * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with |
2071 | * a certain separator (' ' by default): | |
2072 | * C colon | |
2073 | * D dash | |
2074 | * N no separator | |
2075 | * The maximum supported length is 64 bytes of the input. Consider | |
2076 | * to use print_hex_dump() for the larger input. | |
aaf07621 JP |
2077 | * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives |
2078 | * (default assumed to be phys_addr_t, passed by reference) | |
c0d92a57 OJ |
2079 | * - 'd[234]' For a dentry name (optionally 2-4 last components) |
2080 | * - 'D[234]' Same as 'd' but for a struct file | |
1031bc58 | 2081 | * - 'g' For block_device name (gendisk + partition number) |
4d42c447 AS |
2082 | * - 't[R][dt][r]' For time and date as represented: |
2083 | * R struct rtc_time | |
900cca29 GU |
2084 | * - 'C' For a clock, it prints the name (Common Clock Framework) or address |
2085 | * (legacy clock framework) of the clock | |
2086 | * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address | |
2087 | * (legacy clock framework) of the clock | |
edf14cdb VB |
2088 | * - 'G' For flags to be printed as a collection of symbolic strings that would |
2089 | * construct the specific value. Supported flags given by option: | |
2090 | * p page flags (see struct page) given as pointer to unsigned long | |
2091 | * g gfp flags (GFP_* and __GFP_*) given as pointer to gfp_t | |
2092 | * v vma flags (VM_*) given as pointer to unsigned long | |
94ac8f20 GU |
2093 | * - 'OF[fnpPcCF]' For a device tree object |
2094 | * Without any optional arguments prints the full_name | |
2095 | * f device node full_name | |
2096 | * n device node name | |
2097 | * p device node phandle | |
2098 | * P device node path spec (name + @unit) | |
2099 | * F device node flags | |
2100 | * c major compatible string | |
2101 | * C full compatible string | |
7b1924a1 TH |
2102 | * - 'x' For printing the address. Equivalent to "%lx". |
2103 | * | |
b3ed2321 TH |
2104 | * ** When making changes please also update: |
2105 | * Documentation/core-api/printk-formats.rst | |
9ac6e44e | 2106 | * |
ad67b74d TH |
2107 | * Note: The default behaviour (unadorned %p) is to hash the address, |
2108 | * rendering it useful as a unique identifier. | |
4d8a743c | 2109 | */ |
cf3b429b JP |
2110 | static noinline_for_stack |
2111 | char *pointer(const char *fmt, char *buf, char *end, void *ptr, | |
2112 | struct printf_spec spec) | |
78a8bf69 | 2113 | { |
0fe1ef24 LT |
2114 | switch (*fmt) { |
2115 | case 'F': | |
0c8b946e | 2116 | case 'f': |
0fe1ef24 | 2117 | case 'S': |
9ac6e44e | 2118 | case 's': |
04b8eb7a SS |
2119 | ptr = dereference_symbol_descriptor(ptr); |
2120 | /* Fallthrough */ | |
0f77a8d3 | 2121 | case 'B': |
b0d33c2b | 2122 | return symbol_string(buf, end, ptr, spec, fmt); |
332d2e78 | 2123 | case 'R': |
c7dabef8 | 2124 | case 'r': |
fd95541e | 2125 | return resource_string(buf, end, ptr, spec, fmt); |
31550a16 AS |
2126 | case 'h': |
2127 | return hex_string(buf, end, ptr, spec, fmt); | |
dbc760bc TH |
2128 | case 'b': |
2129 | switch (fmt[1]) { | |
2130 | case 'l': | |
2131 | return bitmap_list_string(buf, end, ptr, spec, fmt); | |
2132 | default: | |
2133 | return bitmap_string(buf, end, ptr, spec, fmt); | |
2134 | } | |
8a27f7c9 JP |
2135 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
2136 | case 'm': /* Contiguous: 000102030405 */ | |
76597ff9 AE |
2137 | /* [mM]F (FDDI) */ |
2138 | /* [mM]R (Reverse order; Bluetooth) */ | |
8a27f7c9 JP |
2139 | return mac_address_string(buf, end, ptr, spec, fmt); |
2140 | case 'I': /* Formatted IP supported | |
2141 | * 4: 1.2.3.4 | |
2142 | * 6: 0001:0203:...:0708 | |
2143 | * 6c: 1::708 or 1::1.2.3.4 | |
2144 | */ | |
2145 | case 'i': /* Contiguous: | |
2146 | * 4: 001.002.003.004 | |
2147 | * 6: 000102...0f | |
2148 | */ | |
f00cc102 | 2149 | return ip_addr_string(buf, end, ptr, spec, fmt); |
71dca95d AS |
2150 | case 'E': |
2151 | return escaped_string(buf, end, ptr, spec, fmt); | |
9ac6e44e JP |
2152 | case 'U': |
2153 | return uuid_string(buf, end, ptr, spec, fmt); | |
7db6f5fb | 2154 | case 'V': |
3e5903eb | 2155 | return va_format(buf, end, ptr, spec, fmt); |
455cd5ab | 2156 | case 'K': |
57e73442 | 2157 | return restricted_pointer(buf, end, ptr, spec); |
c8f44aff | 2158 | case 'N': |
431bca24 | 2159 | return netdev_bits(buf, end, ptr, spec, fmt); |
7d799210 | 2160 | case 'a': |
3e5903eb | 2161 | return address_val(buf, end, ptr, spec, fmt); |
4b6ccca7 AV |
2162 | case 'd': |
2163 | return dentry_name(buf, end, ptr, spec, fmt); | |
4d42c447 AS |
2164 | case 't': |
2165 | return time_and_date(buf, end, ptr, spec, fmt); | |
900cca29 GU |
2166 | case 'C': |
2167 | return clock(buf, end, ptr, spec, fmt); | |
4b6ccca7 AV |
2168 | case 'D': |
2169 | return dentry_name(buf, end, | |
2170 | ((const struct file *)ptr)->f_path.dentry, | |
2171 | spec, fmt); | |
1031bc58 DM |
2172 | #ifdef CONFIG_BLOCK |
2173 | case 'g': | |
2174 | return bdev_name(buf, end, ptr, spec, fmt); | |
2175 | #endif | |
2176 | ||
edf14cdb | 2177 | case 'G': |
0b74d4d7 | 2178 | return flags_string(buf, end, ptr, spec, fmt); |
ce4fecf1 | 2179 | case 'O': |
798cc27a | 2180 | return kobject_string(buf, end, ptr, spec, fmt); |
7b1924a1 TH |
2181 | case 'x': |
2182 | return pointer_string(buf, end, ptr, spec); | |
fef20d9c | 2183 | } |
fef20d9c | 2184 | |
ad67b74d TH |
2185 | /* default is to _not_ leak addresses, hash before printing */ |
2186 | return ptr_to_id(buf, end, ptr, spec); | |
fef20d9c FW |
2187 | } |
2188 | ||
2189 | /* | |
2190 | * Helper function to decode printf style format. | |
2191 | * Each call decode a token from the format and return the | |
2192 | * number of characters read (or likely the delta where it wants | |
2193 | * to go on the next call). | |
2194 | * The decoded token is returned through the parameters | |
2195 | * | |
2196 | * 'h', 'l', or 'L' for integer fields | |
2197 | * 'z' support added 23/7/1999 S.H. | |
2198 | * 'z' changed to 'Z' --davidm 1/25/99 | |
5b5e0928 | 2199 | * 'Z' changed to 'z' --adobriyan 2017-01-25 |
fef20d9c FW |
2200 | * 't' added for ptrdiff_t |
2201 | * | |
2202 | * @fmt: the format string | |
2203 | * @type of the token returned | |
2204 | * @flags: various flags such as +, -, # tokens.. | |
2205 | * @field_width: overwritten width | |
2206 | * @base: base of the number (octal, hex, ...) | |
2207 | * @precision: precision of a number | |
2208 | * @qualifier: qualifier of a number (long, size_t, ...) | |
2209 | */ | |
cf3b429b JP |
2210 | static noinline_for_stack |
2211 | int format_decode(const char *fmt, struct printf_spec *spec) | |
fef20d9c FW |
2212 | { |
2213 | const char *start = fmt; | |
d0484193 | 2214 | char qualifier; |
fef20d9c FW |
2215 | |
2216 | /* we finished early by reading the field width */ | |
ed681a91 | 2217 | if (spec->type == FORMAT_TYPE_WIDTH) { |
fef20d9c FW |
2218 | if (spec->field_width < 0) { |
2219 | spec->field_width = -spec->field_width; | |
2220 | spec->flags |= LEFT; | |
2221 | } | |
2222 | spec->type = FORMAT_TYPE_NONE; | |
2223 | goto precision; | |
2224 | } | |
2225 | ||
2226 | /* we finished early by reading the precision */ | |
2227 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
2228 | if (spec->precision < 0) | |
2229 | spec->precision = 0; | |
2230 | ||
2231 | spec->type = FORMAT_TYPE_NONE; | |
2232 | goto qualifier; | |
2233 | } | |
2234 | ||
2235 | /* By default */ | |
2236 | spec->type = FORMAT_TYPE_NONE; | |
2237 | ||
2238 | for (; *fmt ; ++fmt) { | |
2239 | if (*fmt == '%') | |
2240 | break; | |
2241 | } | |
2242 | ||
2243 | /* Return the current non-format string */ | |
2244 | if (fmt != start || !*fmt) | |
2245 | return fmt - start; | |
2246 | ||
2247 | /* Process flags */ | |
2248 | spec->flags = 0; | |
2249 | ||
2250 | while (1) { /* this also skips first '%' */ | |
2251 | bool found = true; | |
2252 | ||
2253 | ++fmt; | |
2254 | ||
2255 | switch (*fmt) { | |
2256 | case '-': spec->flags |= LEFT; break; | |
2257 | case '+': spec->flags |= PLUS; break; | |
2258 | case ' ': spec->flags |= SPACE; break; | |
2259 | case '#': spec->flags |= SPECIAL; break; | |
2260 | case '0': spec->flags |= ZEROPAD; break; | |
2261 | default: found = false; | |
2262 | } | |
2263 | ||
2264 | if (!found) | |
2265 | break; | |
2266 | } | |
2267 | ||
2268 | /* get field width */ | |
2269 | spec->field_width = -1; | |
2270 | ||
2271 | if (isdigit(*fmt)) | |
2272 | spec->field_width = skip_atoi(&fmt); | |
2273 | else if (*fmt == '*') { | |
2274 | /* it's the next argument */ | |
ed681a91 | 2275 | spec->type = FORMAT_TYPE_WIDTH; |
fef20d9c FW |
2276 | return ++fmt - start; |
2277 | } | |
2278 | ||
2279 | precision: | |
2280 | /* get the precision */ | |
2281 | spec->precision = -1; | |
2282 | if (*fmt == '.') { | |
2283 | ++fmt; | |
2284 | if (isdigit(*fmt)) { | |
2285 | spec->precision = skip_atoi(&fmt); | |
2286 | if (spec->precision < 0) | |
2287 | spec->precision = 0; | |
2288 | } else if (*fmt == '*') { | |
2289 | /* it's the next argument */ | |
adf26f84 | 2290 | spec->type = FORMAT_TYPE_PRECISION; |
fef20d9c FW |
2291 | return ++fmt - start; |
2292 | } | |
2293 | } | |
2294 | ||
2295 | qualifier: | |
2296 | /* get the conversion qualifier */ | |
d0484193 | 2297 | qualifier = 0; |
75fb8f26 | 2298 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
5b5e0928 | 2299 | *fmt == 'z' || *fmt == 't') { |
d0484193 RV |
2300 | qualifier = *fmt++; |
2301 | if (unlikely(qualifier == *fmt)) { | |
2302 | if (qualifier == 'l') { | |
2303 | qualifier = 'L'; | |
a4e94ef0 | 2304 | ++fmt; |
d0484193 RV |
2305 | } else if (qualifier == 'h') { |
2306 | qualifier = 'H'; | |
a4e94ef0 Z |
2307 | ++fmt; |
2308 | } | |
fef20d9c FW |
2309 | } |
2310 | } | |
2311 | ||
2312 | /* default base */ | |
2313 | spec->base = 10; | |
2314 | switch (*fmt) { | |
2315 | case 'c': | |
2316 | spec->type = FORMAT_TYPE_CHAR; | |
2317 | return ++fmt - start; | |
2318 | ||
2319 | case 's': | |
2320 | spec->type = FORMAT_TYPE_STR; | |
2321 | return ++fmt - start; | |
2322 | ||
2323 | case 'p': | |
2324 | spec->type = FORMAT_TYPE_PTR; | |
ffbfed03 | 2325 | return ++fmt - start; |
fef20d9c | 2326 | |
fef20d9c FW |
2327 | case '%': |
2328 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
2329 | return ++fmt - start; | |
2330 | ||
2331 | /* integer number formats - set up the flags and "break" */ | |
2332 | case 'o': | |
2333 | spec->base = 8; | |
2334 | break; | |
2335 | ||
2336 | case 'x': | |
2337 | spec->flags |= SMALL; | |
7e6bd6f3 | 2338 | /* fall through */ |
fef20d9c FW |
2339 | |
2340 | case 'X': | |
2341 | spec->base = 16; | |
2342 | break; | |
2343 | ||
2344 | case 'd': | |
2345 | case 'i': | |
39e874f8 | 2346 | spec->flags |= SIGN; |
fef20d9c | 2347 | case 'u': |
4aa99606 | 2348 | break; |
fef20d9c | 2349 | |
708d96fd RM |
2350 | case 'n': |
2351 | /* | |
b006f19b RV |
2352 | * Since %n poses a greater security risk than |
2353 | * utility, treat it as any other invalid or | |
2354 | * unsupported format specifier. | |
708d96fd | 2355 | */ |
708d96fd RM |
2356 | /* Fall-through */ |
2357 | ||
fef20d9c | 2358 | default: |
b006f19b | 2359 | WARN_ONCE(1, "Please remove unsupported %%%c in format string\n", *fmt); |
fef20d9c FW |
2360 | spec->type = FORMAT_TYPE_INVALID; |
2361 | return fmt - start; | |
0fe1ef24 | 2362 | } |
fef20d9c | 2363 | |
d0484193 | 2364 | if (qualifier == 'L') |
fef20d9c | 2365 | spec->type = FORMAT_TYPE_LONG_LONG; |
d0484193 | 2366 | else if (qualifier == 'l') { |
51be17df RV |
2367 | BUILD_BUG_ON(FORMAT_TYPE_ULONG + SIGN != FORMAT_TYPE_LONG); |
2368 | spec->type = FORMAT_TYPE_ULONG + (spec->flags & SIGN); | |
5b5e0928 | 2369 | } else if (qualifier == 'z') { |
fef20d9c | 2370 | spec->type = FORMAT_TYPE_SIZE_T; |
d0484193 | 2371 | } else if (qualifier == 't') { |
fef20d9c | 2372 | spec->type = FORMAT_TYPE_PTRDIFF; |
d0484193 | 2373 | } else if (qualifier == 'H') { |
51be17df RV |
2374 | BUILD_BUG_ON(FORMAT_TYPE_UBYTE + SIGN != FORMAT_TYPE_BYTE); |
2375 | spec->type = FORMAT_TYPE_UBYTE + (spec->flags & SIGN); | |
d0484193 | 2376 | } else if (qualifier == 'h') { |
51be17df RV |
2377 | BUILD_BUG_ON(FORMAT_TYPE_USHORT + SIGN != FORMAT_TYPE_SHORT); |
2378 | spec->type = FORMAT_TYPE_USHORT + (spec->flags & SIGN); | |
fef20d9c | 2379 | } else { |
51be17df RV |
2380 | BUILD_BUG_ON(FORMAT_TYPE_UINT + SIGN != FORMAT_TYPE_INT); |
2381 | spec->type = FORMAT_TYPE_UINT + (spec->flags & SIGN); | |
78a8bf69 | 2382 | } |
fef20d9c FW |
2383 | |
2384 | return ++fmt - start; | |
78a8bf69 LT |
2385 | } |
2386 | ||
4d72ba01 RV |
2387 | static void |
2388 | set_field_width(struct printf_spec *spec, int width) | |
2389 | { | |
2390 | spec->field_width = width; | |
2391 | if (WARN_ONCE(spec->field_width != width, "field width %d too large", width)) { | |
2392 | spec->field_width = clamp(width, -FIELD_WIDTH_MAX, FIELD_WIDTH_MAX); | |
2393 | } | |
2394 | } | |
2395 | ||
2396 | static void | |
2397 | set_precision(struct printf_spec *spec, int prec) | |
2398 | { | |
2399 | spec->precision = prec; | |
2400 | if (WARN_ONCE(spec->precision != prec, "precision %d too large", prec)) { | |
2401 | spec->precision = clamp(prec, 0, PRECISION_MAX); | |
2402 | } | |
2403 | } | |
2404 | ||
1da177e4 LT |
2405 | /** |
2406 | * vsnprintf - Format a string and place it in a buffer | |
2407 | * @buf: The buffer to place the result into | |
2408 | * @size: The size of the buffer, including the trailing null space | |
2409 | * @fmt: The format string to use | |
2410 | * @args: Arguments for the format string | |
2411 | * | |
d7ec9a05 RV |
2412 | * This function generally follows C99 vsnprintf, but has some |
2413 | * extensions and a few limitations: | |
2414 | * | |
6cc89134 | 2415 | * - ``%n`` is unsupported |
2416 | * - ``%p*`` is handled by pointer() | |
5e4ee7b1 | 2417 | * |
27e7c0e8 | 2418 | * See pointer() or Documentation/core-api/printk-formats.rst for more |
5e4ee7b1 | 2419 | * extensive description. |
20036fdc | 2420 | * |
6cc89134 | 2421 | * **Please update the documentation in both places when making changes** |
80f548e0 | 2422 | * |
1da177e4 LT |
2423 | * The return value is the number of characters which would |
2424 | * be generated for the given input, excluding the trailing | |
2425 | * '\0', as per ISO C99. If you want to have the exact | |
2426 | * number of characters written into @buf as return value | |
72fd4a35 | 2427 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
2428 | * return is greater than or equal to @size, the resulting |
2429 | * string is truncated. | |
2430 | * | |
ba1835eb | 2431 | * If you're not already dealing with a va_list consider using snprintf(). |
1da177e4 LT |
2432 | */ |
2433 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
2434 | { | |
1da177e4 | 2435 | unsigned long long num; |
d4be151b | 2436 | char *str, *end; |
fef20d9c | 2437 | struct printf_spec spec = {0}; |
1da177e4 | 2438 | |
f796937a JF |
2439 | /* Reject out-of-range values early. Large positive sizes are |
2440 | used for unknown buffer sizes. */ | |
2aa2f9e2 | 2441 | if (WARN_ON_ONCE(size > INT_MAX)) |
1da177e4 | 2442 | return 0; |
1da177e4 LT |
2443 | |
2444 | str = buf; | |
f796937a | 2445 | end = buf + size; |
1da177e4 | 2446 | |
f796937a JF |
2447 | /* Make sure end is always >= buf */ |
2448 | if (end < buf) { | |
2449 | end = ((void *)-1); | |
2450 | size = end - buf; | |
1da177e4 LT |
2451 | } |
2452 | ||
fef20d9c FW |
2453 | while (*fmt) { |
2454 | const char *old_fmt = fmt; | |
d4be151b | 2455 | int read = format_decode(fmt, &spec); |
1da177e4 | 2456 | |
fef20d9c | 2457 | fmt += read; |
1da177e4 | 2458 | |
fef20d9c FW |
2459 | switch (spec.type) { |
2460 | case FORMAT_TYPE_NONE: { | |
2461 | int copy = read; | |
2462 | if (str < end) { | |
2463 | if (copy > end - str) | |
2464 | copy = end - str; | |
2465 | memcpy(str, old_fmt, copy); | |
1da177e4 | 2466 | } |
fef20d9c FW |
2467 | str += read; |
2468 | break; | |
1da177e4 LT |
2469 | } |
2470 | ||
ed681a91 | 2471 | case FORMAT_TYPE_WIDTH: |
4d72ba01 | 2472 | set_field_width(&spec, va_arg(args, int)); |
fef20d9c | 2473 | break; |
1da177e4 | 2474 | |
fef20d9c | 2475 | case FORMAT_TYPE_PRECISION: |
4d72ba01 | 2476 | set_precision(&spec, va_arg(args, int)); |
fef20d9c | 2477 | break; |
1da177e4 | 2478 | |
d4be151b AGR |
2479 | case FORMAT_TYPE_CHAR: { |
2480 | char c; | |
2481 | ||
fef20d9c FW |
2482 | if (!(spec.flags & LEFT)) { |
2483 | while (--spec.field_width > 0) { | |
f796937a | 2484 | if (str < end) |
1da177e4 LT |
2485 | *str = ' '; |
2486 | ++str; | |
1da177e4 | 2487 | |
fef20d9c FW |
2488 | } |
2489 | } | |
2490 | c = (unsigned char) va_arg(args, int); | |
2491 | if (str < end) | |
2492 | *str = c; | |
2493 | ++str; | |
2494 | while (--spec.field_width > 0) { | |
f796937a | 2495 | if (str < end) |
fef20d9c | 2496 | *str = ' '; |
1da177e4 | 2497 | ++str; |
fef20d9c FW |
2498 | } |
2499 | break; | |
d4be151b | 2500 | } |
1da177e4 | 2501 | |
fef20d9c FW |
2502 | case FORMAT_TYPE_STR: |
2503 | str = string(str, end, va_arg(args, char *), spec); | |
2504 | break; | |
1da177e4 | 2505 | |
fef20d9c | 2506 | case FORMAT_TYPE_PTR: |
ffbfed03 | 2507 | str = pointer(fmt, str, end, va_arg(args, void *), |
fef20d9c FW |
2508 | spec); |
2509 | while (isalnum(*fmt)) | |
2510 | fmt++; | |
2511 | break; | |
1da177e4 | 2512 | |
fef20d9c FW |
2513 | case FORMAT_TYPE_PERCENT_CHAR: |
2514 | if (str < end) | |
2515 | *str = '%'; | |
2516 | ++str; | |
2517 | break; | |
1da177e4 | 2518 | |
fef20d9c | 2519 | case FORMAT_TYPE_INVALID: |
b006f19b RV |
2520 | /* |
2521 | * Presumably the arguments passed gcc's type | |
2522 | * checking, but there is no safe or sane way | |
2523 | * for us to continue parsing the format and | |
2524 | * fetching from the va_list; the remaining | |
2525 | * specifiers and arguments would be out of | |
2526 | * sync. | |
2527 | */ | |
2528 | goto out; | |
fef20d9c | 2529 | |
fef20d9c FW |
2530 | default: |
2531 | switch (spec.type) { | |
2532 | case FORMAT_TYPE_LONG_LONG: | |
2533 | num = va_arg(args, long long); | |
2534 | break; | |
2535 | case FORMAT_TYPE_ULONG: | |
2536 | num = va_arg(args, unsigned long); | |
2537 | break; | |
2538 | case FORMAT_TYPE_LONG: | |
2539 | num = va_arg(args, long); | |
2540 | break; | |
2541 | case FORMAT_TYPE_SIZE_T: | |
ef124960 JG |
2542 | if (spec.flags & SIGN) |
2543 | num = va_arg(args, ssize_t); | |
2544 | else | |
2545 | num = va_arg(args, size_t); | |
fef20d9c FW |
2546 | break; |
2547 | case FORMAT_TYPE_PTRDIFF: | |
2548 | num = va_arg(args, ptrdiff_t); | |
2549 | break; | |
a4e94ef0 Z |
2550 | case FORMAT_TYPE_UBYTE: |
2551 | num = (unsigned char) va_arg(args, int); | |
2552 | break; | |
2553 | case FORMAT_TYPE_BYTE: | |
2554 | num = (signed char) va_arg(args, int); | |
2555 | break; | |
fef20d9c FW |
2556 | case FORMAT_TYPE_USHORT: |
2557 | num = (unsigned short) va_arg(args, int); | |
2558 | break; | |
2559 | case FORMAT_TYPE_SHORT: | |
2560 | num = (short) va_arg(args, int); | |
2561 | break; | |
39e874f8 FW |
2562 | case FORMAT_TYPE_INT: |
2563 | num = (int) va_arg(args, int); | |
fef20d9c FW |
2564 | break; |
2565 | default: | |
2566 | num = va_arg(args, unsigned int); | |
2567 | } | |
2568 | ||
2569 | str = number(str, end, num, spec); | |
1da177e4 | 2570 | } |
1da177e4 | 2571 | } |
fef20d9c | 2572 | |
b006f19b | 2573 | out: |
f796937a JF |
2574 | if (size > 0) { |
2575 | if (str < end) | |
2576 | *str = '\0'; | |
2577 | else | |
0a6047ee | 2578 | end[-1] = '\0'; |
f796937a | 2579 | } |
fef20d9c | 2580 | |
f796937a | 2581 | /* the trailing null byte doesn't count towards the total */ |
1da177e4 | 2582 | return str-buf; |
fef20d9c | 2583 | |
1da177e4 | 2584 | } |
1da177e4 LT |
2585 | EXPORT_SYMBOL(vsnprintf); |
2586 | ||
2587 | /** | |
2588 | * vscnprintf - Format a string and place it in a buffer | |
2589 | * @buf: The buffer to place the result into | |
2590 | * @size: The size of the buffer, including the trailing null space | |
2591 | * @fmt: The format string to use | |
2592 | * @args: Arguments for the format string | |
2593 | * | |
2594 | * The return value is the number of characters which have been written into | |
b921c69f | 2595 | * the @buf not including the trailing '\0'. If @size is == 0 the function |
1da177e4 LT |
2596 | * returns 0. |
2597 | * | |
ba1835eb | 2598 | * If you're not already dealing with a va_list consider using scnprintf(). |
20036fdc AK |
2599 | * |
2600 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
2601 | */ |
2602 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
2603 | { | |
2604 | int i; | |
2605 | ||
7b9186f5 AGR |
2606 | i = vsnprintf(buf, size, fmt, args); |
2607 | ||
b921c69f AA |
2608 | if (likely(i < size)) |
2609 | return i; | |
2610 | if (size != 0) | |
2611 | return size - 1; | |
2612 | return 0; | |
1da177e4 | 2613 | } |
1da177e4 LT |
2614 | EXPORT_SYMBOL(vscnprintf); |
2615 | ||
2616 | /** | |
2617 | * snprintf - Format a string and place it in a buffer | |
2618 | * @buf: The buffer to place the result into | |
2619 | * @size: The size of the buffer, including the trailing null space | |
2620 | * @fmt: The format string to use | |
2621 | * @...: Arguments for the format string | |
2622 | * | |
2623 | * The return value is the number of characters which would be | |
2624 | * generated for the given input, excluding the trailing null, | |
2625 | * as per ISO C99. If the return is greater than or equal to | |
2626 | * @size, the resulting string is truncated. | |
20036fdc AK |
2627 | * |
2628 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 2629 | */ |
7b9186f5 | 2630 | int snprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
2631 | { |
2632 | va_list args; | |
2633 | int i; | |
2634 | ||
2635 | va_start(args, fmt); | |
7b9186f5 | 2636 | i = vsnprintf(buf, size, fmt, args); |
1da177e4 | 2637 | va_end(args); |
7b9186f5 | 2638 | |
1da177e4 LT |
2639 | return i; |
2640 | } | |
1da177e4 LT |
2641 | EXPORT_SYMBOL(snprintf); |
2642 | ||
2643 | /** | |
2644 | * scnprintf - Format a string and place it in a buffer | |
2645 | * @buf: The buffer to place the result into | |
2646 | * @size: The size of the buffer, including the trailing null space | |
2647 | * @fmt: The format string to use | |
2648 | * @...: Arguments for the format string | |
2649 | * | |
2650 | * The return value is the number of characters written into @buf not including | |
b903c0b8 | 2651 | * the trailing '\0'. If @size is == 0 the function returns 0. |
1da177e4 LT |
2652 | */ |
2653 | ||
7b9186f5 | 2654 | int scnprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
2655 | { |
2656 | va_list args; | |
2657 | int i; | |
2658 | ||
2659 | va_start(args, fmt); | |
b921c69f | 2660 | i = vscnprintf(buf, size, fmt, args); |
1da177e4 | 2661 | va_end(args); |
7b9186f5 | 2662 | |
b921c69f | 2663 | return i; |
1da177e4 LT |
2664 | } |
2665 | EXPORT_SYMBOL(scnprintf); | |
2666 | ||
2667 | /** | |
2668 | * vsprintf - Format a string and place it in a buffer | |
2669 | * @buf: The buffer to place the result into | |
2670 | * @fmt: The format string to use | |
2671 | * @args: Arguments for the format string | |
2672 | * | |
2673 | * The function returns the number of characters written | |
72fd4a35 | 2674 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
2675 | * buffer overflows. |
2676 | * | |
ba1835eb | 2677 | * If you're not already dealing with a va_list consider using sprintf(). |
20036fdc AK |
2678 | * |
2679 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
2680 | */ |
2681 | int vsprintf(char *buf, const char *fmt, va_list args) | |
2682 | { | |
2683 | return vsnprintf(buf, INT_MAX, fmt, args); | |
2684 | } | |
1da177e4 LT |
2685 | EXPORT_SYMBOL(vsprintf); |
2686 | ||
2687 | /** | |
2688 | * sprintf - Format a string and place it in a buffer | |
2689 | * @buf: The buffer to place the result into | |
2690 | * @fmt: The format string to use | |
2691 | * @...: Arguments for the format string | |
2692 | * | |
2693 | * The function returns the number of characters written | |
72fd4a35 | 2694 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 | 2695 | * buffer overflows. |
20036fdc AK |
2696 | * |
2697 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 2698 | */ |
7b9186f5 | 2699 | int sprintf(char *buf, const char *fmt, ...) |
1da177e4 LT |
2700 | { |
2701 | va_list args; | |
2702 | int i; | |
2703 | ||
2704 | va_start(args, fmt); | |
7b9186f5 | 2705 | i = vsnprintf(buf, INT_MAX, fmt, args); |
1da177e4 | 2706 | va_end(args); |
7b9186f5 | 2707 | |
1da177e4 LT |
2708 | return i; |
2709 | } | |
1da177e4 LT |
2710 | EXPORT_SYMBOL(sprintf); |
2711 | ||
4370aa4a LJ |
2712 | #ifdef CONFIG_BINARY_PRINTF |
2713 | /* | |
2714 | * bprintf service: | |
2715 | * vbin_printf() - VA arguments to binary data | |
2716 | * bstr_printf() - Binary data to text string | |
2717 | */ | |
2718 | ||
2719 | /** | |
2720 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
2721 | * @bin_buf: The buffer to place args' binary value | |
2722 | * @size: The size of the buffer(by words(32bits), not characters) | |
2723 | * @fmt: The format string to use | |
2724 | * @args: Arguments for the format string | |
2725 | * | |
2726 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
da3dae54 | 2727 | * is skipped. |
4370aa4a LJ |
2728 | * |
2729 | * The return value is the number of words(32bits) which would be generated for | |
2730 | * the given input. | |
2731 | * | |
2732 | * NOTE: | |
2733 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
2734 | * valid for bstr_printf(). | |
2735 | */ | |
2736 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
2737 | { | |
fef20d9c | 2738 | struct printf_spec spec = {0}; |
4370aa4a | 2739 | char *str, *end; |
841a915d | 2740 | int width; |
4370aa4a LJ |
2741 | |
2742 | str = (char *)bin_buf; | |
2743 | end = (char *)(bin_buf + size); | |
2744 | ||
2745 | #define save_arg(type) \ | |
841a915d SRV |
2746 | ({ \ |
2747 | unsigned long long value; \ | |
4370aa4a | 2748 | if (sizeof(type) == 8) { \ |
841a915d | 2749 | unsigned long long val8; \ |
4370aa4a | 2750 | str = PTR_ALIGN(str, sizeof(u32)); \ |
841a915d | 2751 | val8 = va_arg(args, unsigned long long); \ |
4370aa4a | 2752 | if (str + sizeof(type) <= end) { \ |
841a915d SRV |
2753 | *(u32 *)str = *(u32 *)&val8; \ |
2754 | *(u32 *)(str + 4) = *((u32 *)&val8 + 1); \ | |
4370aa4a | 2755 | } \ |
841a915d | 2756 | value = val8; \ |
4370aa4a | 2757 | } else { \ |
841a915d | 2758 | unsigned int val4; \ |
4370aa4a | 2759 | str = PTR_ALIGN(str, sizeof(type)); \ |
841a915d | 2760 | val4 = va_arg(args, int); \ |
4370aa4a | 2761 | if (str + sizeof(type) <= end) \ |
841a915d SRV |
2762 | *(typeof(type) *)str = (type)(long)val4; \ |
2763 | value = (unsigned long long)val4; \ | |
4370aa4a LJ |
2764 | } \ |
2765 | str += sizeof(type); \ | |
841a915d SRV |
2766 | value; \ |
2767 | }) | |
4370aa4a | 2768 | |
fef20d9c | 2769 | while (*fmt) { |
d4be151b | 2770 | int read = format_decode(fmt, &spec); |
4370aa4a | 2771 | |
fef20d9c | 2772 | fmt += read; |
4370aa4a | 2773 | |
fef20d9c FW |
2774 | switch (spec.type) { |
2775 | case FORMAT_TYPE_NONE: | |
d4be151b | 2776 | case FORMAT_TYPE_PERCENT_CHAR: |
fef20d9c | 2777 | break; |
b006f19b RV |
2778 | case FORMAT_TYPE_INVALID: |
2779 | goto out; | |
fef20d9c | 2780 | |
ed681a91 | 2781 | case FORMAT_TYPE_WIDTH: |
fef20d9c | 2782 | case FORMAT_TYPE_PRECISION: |
841a915d SRV |
2783 | width = (int)save_arg(int); |
2784 | /* Pointers may require the width */ | |
2785 | if (*fmt == 'p') | |
2786 | set_field_width(&spec, width); | |
fef20d9c FW |
2787 | break; |
2788 | ||
2789 | case FORMAT_TYPE_CHAR: | |
4370aa4a | 2790 | save_arg(char); |
fef20d9c FW |
2791 | break; |
2792 | ||
2793 | case FORMAT_TYPE_STR: { | |
4370aa4a | 2794 | const char *save_str = va_arg(args, char *); |
3e5903eb | 2795 | const char *err_msg; |
4370aa4a | 2796 | size_t len; |
6c356634 | 2797 | |
3e5903eb PM |
2798 | err_msg = check_pointer_msg(save_str); |
2799 | if (err_msg) | |
2800 | save_str = err_msg; | |
2801 | ||
6c356634 AGR |
2802 | len = strlen(save_str) + 1; |
2803 | if (str + len < end) | |
2804 | memcpy(str, save_str, len); | |
2805 | str += len; | |
fef20d9c | 2806 | break; |
4370aa4a | 2807 | } |
fef20d9c FW |
2808 | |
2809 | case FORMAT_TYPE_PTR: | |
841a915d SRV |
2810 | /* Dereferenced pointers must be done now */ |
2811 | switch (*fmt) { | |
2812 | /* Dereference of functions is still OK */ | |
2813 | case 'S': | |
2814 | case 's': | |
2815 | case 'F': | |
2816 | case 'f': | |
1e6338cf SRV |
2817 | case 'x': |
2818 | case 'K': | |
841a915d SRV |
2819 | save_arg(void *); |
2820 | break; | |
2821 | default: | |
2822 | if (!isalnum(*fmt)) { | |
2823 | save_arg(void *); | |
2824 | break; | |
2825 | } | |
2826 | str = pointer(fmt, str, end, va_arg(args, void *), | |
2827 | spec); | |
2828 | if (str + 1 < end) | |
2829 | *str++ = '\0'; | |
2830 | else | |
2831 | end[-1] = '\0'; /* Must be nul terminated */ | |
2832 | } | |
4370aa4a | 2833 | /* skip all alphanumeric pointer suffixes */ |
fef20d9c | 2834 | while (isalnum(*fmt)) |
4370aa4a | 2835 | fmt++; |
fef20d9c FW |
2836 | break; |
2837 | ||
fef20d9c FW |
2838 | default: |
2839 | switch (spec.type) { | |
2840 | ||
2841 | case FORMAT_TYPE_LONG_LONG: | |
4370aa4a | 2842 | save_arg(long long); |
fef20d9c FW |
2843 | break; |
2844 | case FORMAT_TYPE_ULONG: | |
2845 | case FORMAT_TYPE_LONG: | |
4370aa4a | 2846 | save_arg(unsigned long); |
fef20d9c FW |
2847 | break; |
2848 | case FORMAT_TYPE_SIZE_T: | |
4370aa4a | 2849 | save_arg(size_t); |
fef20d9c FW |
2850 | break; |
2851 | case FORMAT_TYPE_PTRDIFF: | |
4370aa4a | 2852 | save_arg(ptrdiff_t); |
fef20d9c | 2853 | break; |
a4e94ef0 Z |
2854 | case FORMAT_TYPE_UBYTE: |
2855 | case FORMAT_TYPE_BYTE: | |
2856 | save_arg(char); | |
2857 | break; | |
fef20d9c FW |
2858 | case FORMAT_TYPE_USHORT: |
2859 | case FORMAT_TYPE_SHORT: | |
4370aa4a | 2860 | save_arg(short); |
fef20d9c FW |
2861 | break; |
2862 | default: | |
4370aa4a | 2863 | save_arg(int); |
fef20d9c | 2864 | } |
4370aa4a LJ |
2865 | } |
2866 | } | |
fef20d9c | 2867 | |
b006f19b | 2868 | out: |
7b9186f5 | 2869 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
fef20d9c | 2870 | #undef save_arg |
4370aa4a LJ |
2871 | } |
2872 | EXPORT_SYMBOL_GPL(vbin_printf); | |
2873 | ||
2874 | /** | |
2875 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
2876 | * @buf: The buffer to place the result into | |
2877 | * @size: The size of the buffer, including the trailing null space | |
2878 | * @fmt: The format string to use | |
2879 | * @bin_buf: Binary arguments for the format string | |
2880 | * | |
2881 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
2882 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
2883 | * a binary buffer that generated by vbin_printf. | |
2884 | * | |
2885 | * The format follows C99 vsnprintf, but has some extensions: | |
0efb4d20 | 2886 | * see vsnprintf comment for details. |
4370aa4a LJ |
2887 | * |
2888 | * The return value is the number of characters which would | |
2889 | * be generated for the given input, excluding the trailing | |
2890 | * '\0', as per ISO C99. If you want to have the exact | |
2891 | * number of characters written into @buf as return value | |
2892 | * (not including the trailing '\0'), use vscnprintf(). If the | |
2893 | * return is greater than or equal to @size, the resulting | |
2894 | * string is truncated. | |
2895 | */ | |
2896 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
2897 | { | |
fef20d9c | 2898 | struct printf_spec spec = {0}; |
d4be151b AGR |
2899 | char *str, *end; |
2900 | const char *args = (const char *)bin_buf; | |
4370aa4a | 2901 | |
762abb51 | 2902 | if (WARN_ON_ONCE(size > INT_MAX)) |
4370aa4a | 2903 | return 0; |
4370aa4a LJ |
2904 | |
2905 | str = buf; | |
2906 | end = buf + size; | |
2907 | ||
2908 | #define get_arg(type) \ | |
2909 | ({ \ | |
2910 | typeof(type) value; \ | |
2911 | if (sizeof(type) == 8) { \ | |
2912 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
2913 | *(u32 *)&value = *(u32 *)args; \ | |
2914 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
2915 | } else { \ | |
2916 | args = PTR_ALIGN(args, sizeof(type)); \ | |
2917 | value = *(typeof(type) *)args; \ | |
2918 | } \ | |
2919 | args += sizeof(type); \ | |
2920 | value; \ | |
2921 | }) | |
2922 | ||
2923 | /* Make sure end is always >= buf */ | |
2924 | if (end < buf) { | |
2925 | end = ((void *)-1); | |
2926 | size = end - buf; | |
2927 | } | |
2928 | ||
fef20d9c | 2929 | while (*fmt) { |
fef20d9c | 2930 | const char *old_fmt = fmt; |
d4be151b | 2931 | int read = format_decode(fmt, &spec); |
4370aa4a | 2932 | |
fef20d9c | 2933 | fmt += read; |
4370aa4a | 2934 | |
fef20d9c FW |
2935 | switch (spec.type) { |
2936 | case FORMAT_TYPE_NONE: { | |
2937 | int copy = read; | |
2938 | if (str < end) { | |
2939 | if (copy > end - str) | |
2940 | copy = end - str; | |
2941 | memcpy(str, old_fmt, copy); | |
4370aa4a | 2942 | } |
fef20d9c FW |
2943 | str += read; |
2944 | break; | |
4370aa4a LJ |
2945 | } |
2946 | ||
ed681a91 | 2947 | case FORMAT_TYPE_WIDTH: |
4d72ba01 | 2948 | set_field_width(&spec, get_arg(int)); |
fef20d9c | 2949 | break; |
4370aa4a | 2950 | |
fef20d9c | 2951 | case FORMAT_TYPE_PRECISION: |
4d72ba01 | 2952 | set_precision(&spec, get_arg(int)); |
fef20d9c | 2953 | break; |
4370aa4a | 2954 | |
d4be151b AGR |
2955 | case FORMAT_TYPE_CHAR: { |
2956 | char c; | |
2957 | ||
fef20d9c FW |
2958 | if (!(spec.flags & LEFT)) { |
2959 | while (--spec.field_width > 0) { | |
4370aa4a LJ |
2960 | if (str < end) |
2961 | *str = ' '; | |
2962 | ++str; | |
2963 | } | |
2964 | } | |
2965 | c = (unsigned char) get_arg(char); | |
2966 | if (str < end) | |
2967 | *str = c; | |
2968 | ++str; | |
fef20d9c | 2969 | while (--spec.field_width > 0) { |
4370aa4a LJ |
2970 | if (str < end) |
2971 | *str = ' '; | |
2972 | ++str; | |
2973 | } | |
fef20d9c | 2974 | break; |
d4be151b | 2975 | } |
4370aa4a | 2976 | |
fef20d9c | 2977 | case FORMAT_TYPE_STR: { |
4370aa4a | 2978 | const char *str_arg = args; |
d4be151b | 2979 | args += strlen(str_arg) + 1; |
fef20d9c FW |
2980 | str = string(str, end, (char *)str_arg, spec); |
2981 | break; | |
4370aa4a LJ |
2982 | } |
2983 | ||
841a915d SRV |
2984 | case FORMAT_TYPE_PTR: { |
2985 | bool process = false; | |
2986 | int copy, len; | |
2987 | /* Non function dereferences were already done */ | |
2988 | switch (*fmt) { | |
2989 | case 'S': | |
2990 | case 's': | |
2991 | case 'F': | |
2992 | case 'f': | |
1e6338cf SRV |
2993 | case 'x': |
2994 | case 'K': | |
841a915d SRV |
2995 | process = true; |
2996 | break; | |
2997 | default: | |
2998 | if (!isalnum(*fmt)) { | |
2999 | process = true; | |
3000 | break; | |
3001 | } | |
3002 | /* Pointer dereference was already processed */ | |
3003 | if (str < end) { | |
3004 | len = copy = strlen(args); | |
3005 | if (copy > end - str) | |
3006 | copy = end - str; | |
3007 | memcpy(str, args, copy); | |
3008 | str += len; | |
62165600 | 3009 | args += len + 1; |
841a915d SRV |
3010 | } |
3011 | } | |
3012 | if (process) | |
3013 | str = pointer(fmt, str, end, get_arg(void *), spec); | |
3014 | ||
fef20d9c | 3015 | while (isalnum(*fmt)) |
4370aa4a | 3016 | fmt++; |
fef20d9c | 3017 | break; |
841a915d | 3018 | } |
4370aa4a | 3019 | |
fef20d9c | 3020 | case FORMAT_TYPE_PERCENT_CHAR: |
4370aa4a LJ |
3021 | if (str < end) |
3022 | *str = '%'; | |
3023 | ++str; | |
fef20d9c FW |
3024 | break; |
3025 | ||
b006f19b RV |
3026 | case FORMAT_TYPE_INVALID: |
3027 | goto out; | |
3028 | ||
d4be151b AGR |
3029 | default: { |
3030 | unsigned long long num; | |
3031 | ||
fef20d9c FW |
3032 | switch (spec.type) { |
3033 | ||
3034 | case FORMAT_TYPE_LONG_LONG: | |
3035 | num = get_arg(long long); | |
3036 | break; | |
3037 | case FORMAT_TYPE_ULONG: | |
fef20d9c FW |
3038 | case FORMAT_TYPE_LONG: |
3039 | num = get_arg(unsigned long); | |
3040 | break; | |
3041 | case FORMAT_TYPE_SIZE_T: | |
3042 | num = get_arg(size_t); | |
3043 | break; | |
3044 | case FORMAT_TYPE_PTRDIFF: | |
3045 | num = get_arg(ptrdiff_t); | |
3046 | break; | |
a4e94ef0 Z |
3047 | case FORMAT_TYPE_UBYTE: |
3048 | num = get_arg(unsigned char); | |
3049 | break; | |
3050 | case FORMAT_TYPE_BYTE: | |
3051 | num = get_arg(signed char); | |
3052 | break; | |
fef20d9c FW |
3053 | case FORMAT_TYPE_USHORT: |
3054 | num = get_arg(unsigned short); | |
3055 | break; | |
3056 | case FORMAT_TYPE_SHORT: | |
3057 | num = get_arg(short); | |
3058 | break; | |
3059 | case FORMAT_TYPE_UINT: | |
3060 | num = get_arg(unsigned int); | |
3061 | break; | |
3062 | default: | |
3063 | num = get_arg(int); | |
3064 | } | |
3065 | ||
3066 | str = number(str, end, num, spec); | |
d4be151b AGR |
3067 | } /* default: */ |
3068 | } /* switch(spec.type) */ | |
3069 | } /* while(*fmt) */ | |
fef20d9c | 3070 | |
b006f19b | 3071 | out: |
4370aa4a LJ |
3072 | if (size > 0) { |
3073 | if (str < end) | |
3074 | *str = '\0'; | |
3075 | else | |
3076 | end[-1] = '\0'; | |
3077 | } | |
fef20d9c | 3078 | |
4370aa4a LJ |
3079 | #undef get_arg |
3080 | ||
3081 | /* the trailing null byte doesn't count towards the total */ | |
3082 | return str - buf; | |
3083 | } | |
3084 | EXPORT_SYMBOL_GPL(bstr_printf); | |
3085 | ||
3086 | /** | |
3087 | * bprintf - Parse a format string and place args' binary value in a buffer | |
3088 | * @bin_buf: The buffer to place args' binary value | |
3089 | * @size: The size of the buffer(by words(32bits), not characters) | |
3090 | * @fmt: The format string to use | |
3091 | * @...: Arguments for the format string | |
3092 | * | |
3093 | * The function returns the number of words(u32) written | |
3094 | * into @bin_buf. | |
3095 | */ | |
3096 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
3097 | { | |
3098 | va_list args; | |
3099 | int ret; | |
3100 | ||
3101 | va_start(args, fmt); | |
3102 | ret = vbin_printf(bin_buf, size, fmt, args); | |
3103 | va_end(args); | |
7b9186f5 | 3104 | |
4370aa4a LJ |
3105 | return ret; |
3106 | } | |
3107 | EXPORT_SYMBOL_GPL(bprintf); | |
3108 | ||
3109 | #endif /* CONFIG_BINARY_PRINTF */ | |
3110 | ||
1da177e4 LT |
3111 | /** |
3112 | * vsscanf - Unformat a buffer into a list of arguments | |
3113 | * @buf: input buffer | |
3114 | * @fmt: format of buffer | |
3115 | * @args: arguments | |
3116 | */ | |
7b9186f5 | 3117 | int vsscanf(const char *buf, const char *fmt, va_list args) |
1da177e4 LT |
3118 | { |
3119 | const char *str = buf; | |
3120 | char *next; | |
3121 | char digit; | |
3122 | int num = 0; | |
ef0658f3 | 3123 | u8 qualifier; |
53809751 JB |
3124 | unsigned int base; |
3125 | union { | |
3126 | long long s; | |
3127 | unsigned long long u; | |
3128 | } val; | |
ef0658f3 | 3129 | s16 field_width; |
d4be151b | 3130 | bool is_sign; |
1da177e4 | 3131 | |
da99075c | 3132 | while (*fmt) { |
1da177e4 LT |
3133 | /* skip any white space in format */ |
3134 | /* white space in format matchs any amount of | |
3135 | * white space, including none, in the input. | |
3136 | */ | |
3137 | if (isspace(*fmt)) { | |
e7d2860b AGR |
3138 | fmt = skip_spaces(++fmt); |
3139 | str = skip_spaces(str); | |
1da177e4 LT |
3140 | } |
3141 | ||
3142 | /* anything that is not a conversion must match exactly */ | |
3143 | if (*fmt != '%' && *fmt) { | |
3144 | if (*fmt++ != *str++) | |
3145 | break; | |
3146 | continue; | |
3147 | } | |
3148 | ||
3149 | if (!*fmt) | |
3150 | break; | |
3151 | ++fmt; | |
7b9186f5 | 3152 | |
1da177e4 LT |
3153 | /* skip this conversion. |
3154 | * advance both strings to next white space | |
3155 | */ | |
3156 | if (*fmt == '*') { | |
da99075c JB |
3157 | if (!*str) |
3158 | break; | |
f9310b2f JY |
3159 | while (!isspace(*fmt) && *fmt != '%' && *fmt) { |
3160 | /* '%*[' not yet supported, invalid format */ | |
3161 | if (*fmt == '[') | |
3162 | return num; | |
1da177e4 | 3163 | fmt++; |
f9310b2f | 3164 | } |
1da177e4 LT |
3165 | while (!isspace(*str) && *str) |
3166 | str++; | |
3167 | continue; | |
3168 | } | |
3169 | ||
3170 | /* get field width */ | |
3171 | field_width = -1; | |
53809751 | 3172 | if (isdigit(*fmt)) { |
1da177e4 | 3173 | field_width = skip_atoi(&fmt); |
53809751 JB |
3174 | if (field_width <= 0) |
3175 | break; | |
3176 | } | |
1da177e4 LT |
3177 | |
3178 | /* get conversion qualifier */ | |
3179 | qualifier = -1; | |
75fb8f26 | 3180 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
5b5e0928 | 3181 | *fmt == 'z') { |
1da177e4 LT |
3182 | qualifier = *fmt++; |
3183 | if (unlikely(qualifier == *fmt)) { | |
3184 | if (qualifier == 'h') { | |
3185 | qualifier = 'H'; | |
3186 | fmt++; | |
3187 | } else if (qualifier == 'l') { | |
3188 | qualifier = 'L'; | |
3189 | fmt++; | |
3190 | } | |
3191 | } | |
3192 | } | |
1da177e4 | 3193 | |
da99075c JB |
3194 | if (!*fmt) |
3195 | break; | |
3196 | ||
3197 | if (*fmt == 'n') { | |
3198 | /* return number of characters read so far */ | |
3199 | *va_arg(args, int *) = str - buf; | |
3200 | ++fmt; | |
3201 | continue; | |
3202 | } | |
3203 | ||
3204 | if (!*str) | |
1da177e4 LT |
3205 | break; |
3206 | ||
d4be151b | 3207 | base = 10; |
3f623eba | 3208 | is_sign = false; |
d4be151b | 3209 | |
7b9186f5 | 3210 | switch (*fmt++) { |
1da177e4 LT |
3211 | case 'c': |
3212 | { | |
7b9186f5 | 3213 | char *s = (char *)va_arg(args, char*); |
1da177e4 LT |
3214 | if (field_width == -1) |
3215 | field_width = 1; | |
3216 | do { | |
3217 | *s++ = *str++; | |
3218 | } while (--field_width > 0 && *str); | |
3219 | num++; | |
3220 | } | |
3221 | continue; | |
3222 | case 's': | |
3223 | { | |
7b9186f5 AGR |
3224 | char *s = (char *)va_arg(args, char *); |
3225 | if (field_width == -1) | |
4be929be | 3226 | field_width = SHRT_MAX; |
1da177e4 | 3227 | /* first, skip leading white space in buffer */ |
e7d2860b | 3228 | str = skip_spaces(str); |
1da177e4 LT |
3229 | |
3230 | /* now copy until next white space */ | |
7b9186f5 | 3231 | while (*str && !isspace(*str) && field_width--) |
1da177e4 | 3232 | *s++ = *str++; |
1da177e4 LT |
3233 | *s = '\0'; |
3234 | num++; | |
3235 | } | |
3236 | continue; | |
f9310b2f JY |
3237 | /* |
3238 | * Warning: This implementation of the '[' conversion specifier | |
3239 | * deviates from its glibc counterpart in the following ways: | |
3240 | * (1) It does NOT support ranges i.e. '-' is NOT a special | |
3241 | * character | |
3242 | * (2) It cannot match the closing bracket ']' itself | |
3243 | * (3) A field width is required | |
3244 | * (4) '%*[' (discard matching input) is currently not supported | |
3245 | * | |
3246 | * Example usage: | |
3247 | * ret = sscanf("00:0a:95","%2[^:]:%2[^:]:%2[^:]", | |
3248 | * buf1, buf2, buf3); | |
3249 | * if (ret < 3) | |
3250 | * // etc.. | |
3251 | */ | |
3252 | case '[': | |
3253 | { | |
3254 | char *s = (char *)va_arg(args, char *); | |
3255 | DECLARE_BITMAP(set, 256) = {0}; | |
3256 | unsigned int len = 0; | |
3257 | bool negate = (*fmt == '^'); | |
3258 | ||
3259 | /* field width is required */ | |
3260 | if (field_width == -1) | |
3261 | return num; | |
3262 | ||
3263 | if (negate) | |
3264 | ++fmt; | |
3265 | ||
3266 | for ( ; *fmt && *fmt != ']'; ++fmt, ++len) | |
3267 | set_bit((u8)*fmt, set); | |
3268 | ||
3269 | /* no ']' or no character set found */ | |
3270 | if (!*fmt || !len) | |
3271 | return num; | |
3272 | ++fmt; | |
3273 | ||
3274 | if (negate) { | |
3275 | bitmap_complement(set, set, 256); | |
3276 | /* exclude null '\0' byte */ | |
3277 | clear_bit(0, set); | |
3278 | } | |
3279 | ||
3280 | /* match must be non-empty */ | |
3281 | if (!test_bit((u8)*str, set)) | |
3282 | return num; | |
3283 | ||
3284 | while (test_bit((u8)*str, set) && field_width--) | |
3285 | *s++ = *str++; | |
3286 | *s = '\0'; | |
3287 | ++num; | |
3288 | } | |
3289 | continue; | |
1da177e4 LT |
3290 | case 'o': |
3291 | base = 8; | |
3292 | break; | |
3293 | case 'x': | |
3294 | case 'X': | |
3295 | base = 16; | |
3296 | break; | |
3297 | case 'i': | |
7b9186f5 | 3298 | base = 0; |
7e6bd6f3 | 3299 | /* fall through */ |
1da177e4 | 3300 | case 'd': |
3f623eba | 3301 | is_sign = true; |
7e6bd6f3 | 3302 | /* fall through */ |
1da177e4 LT |
3303 | case 'u': |
3304 | break; | |
3305 | case '%': | |
3306 | /* looking for '%' in str */ | |
7b9186f5 | 3307 | if (*str++ != '%') |
1da177e4 LT |
3308 | return num; |
3309 | continue; | |
3310 | default: | |
3311 | /* invalid format; stop here */ | |
3312 | return num; | |
3313 | } | |
3314 | ||
3315 | /* have some sort of integer conversion. | |
3316 | * first, skip white space in buffer. | |
3317 | */ | |
e7d2860b | 3318 | str = skip_spaces(str); |
1da177e4 LT |
3319 | |
3320 | digit = *str; | |
3321 | if (is_sign && digit == '-') | |
3322 | digit = *(str + 1); | |
3323 | ||
3324 | if (!digit | |
7b9186f5 AGR |
3325 | || (base == 16 && !isxdigit(digit)) |
3326 | || (base == 10 && !isdigit(digit)) | |
3327 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
3328 | || (base == 0 && !isdigit(digit))) | |
3329 | break; | |
1da177e4 | 3330 | |
53809751 JB |
3331 | if (is_sign) |
3332 | val.s = qualifier != 'L' ? | |
3333 | simple_strtol(str, &next, base) : | |
3334 | simple_strtoll(str, &next, base); | |
3335 | else | |
3336 | val.u = qualifier != 'L' ? | |
3337 | simple_strtoul(str, &next, base) : | |
3338 | simple_strtoull(str, &next, base); | |
3339 | ||
3340 | if (field_width > 0 && next - str > field_width) { | |
3341 | if (base == 0) | |
3342 | _parse_integer_fixup_radix(str, &base); | |
3343 | while (next - str > field_width) { | |
3344 | if (is_sign) | |
3345 | val.s = div_s64(val.s, base); | |
3346 | else | |
3347 | val.u = div_u64(val.u, base); | |
3348 | --next; | |
3349 | } | |
3350 | } | |
3351 | ||
7b9186f5 | 3352 | switch (qualifier) { |
1da177e4 | 3353 | case 'H': /* that's 'hh' in format */ |
53809751 JB |
3354 | if (is_sign) |
3355 | *va_arg(args, signed char *) = val.s; | |
3356 | else | |
3357 | *va_arg(args, unsigned char *) = val.u; | |
1da177e4 LT |
3358 | break; |
3359 | case 'h': | |
53809751 JB |
3360 | if (is_sign) |
3361 | *va_arg(args, short *) = val.s; | |
3362 | else | |
3363 | *va_arg(args, unsigned short *) = val.u; | |
1da177e4 LT |
3364 | break; |
3365 | case 'l': | |
53809751 JB |
3366 | if (is_sign) |
3367 | *va_arg(args, long *) = val.s; | |
3368 | else | |
3369 | *va_arg(args, unsigned long *) = val.u; | |
1da177e4 LT |
3370 | break; |
3371 | case 'L': | |
53809751 JB |
3372 | if (is_sign) |
3373 | *va_arg(args, long long *) = val.s; | |
3374 | else | |
3375 | *va_arg(args, unsigned long long *) = val.u; | |
1da177e4 | 3376 | break; |
1da177e4 | 3377 | case 'z': |
53809751 JB |
3378 | *va_arg(args, size_t *) = val.u; |
3379 | break; | |
1da177e4 | 3380 | default: |
53809751 JB |
3381 | if (is_sign) |
3382 | *va_arg(args, int *) = val.s; | |
3383 | else | |
3384 | *va_arg(args, unsigned int *) = val.u; | |
1da177e4 LT |
3385 | break; |
3386 | } | |
3387 | num++; | |
3388 | ||
3389 | if (!next) | |
3390 | break; | |
3391 | str = next; | |
3392 | } | |
c6b40d16 | 3393 | |
1da177e4 LT |
3394 | return num; |
3395 | } | |
1da177e4 LT |
3396 | EXPORT_SYMBOL(vsscanf); |
3397 | ||
3398 | /** | |
3399 | * sscanf - Unformat a buffer into a list of arguments | |
3400 | * @buf: input buffer | |
3401 | * @fmt: formatting of buffer | |
3402 | * @...: resulting arguments | |
3403 | */ | |
7b9186f5 | 3404 | int sscanf(const char *buf, const char *fmt, ...) |
1da177e4 LT |
3405 | { |
3406 | va_list args; | |
3407 | int i; | |
3408 | ||
7b9186f5 AGR |
3409 | va_start(args, fmt); |
3410 | i = vsscanf(buf, fmt, args); | |
1da177e4 | 3411 | va_end(args); |
7b9186f5 | 3412 | |
1da177e4 LT |
3413 | return i; |
3414 | } | |
1da177e4 | 3415 | EXPORT_SYMBOL(sscanf); |