Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/lib/vsprintf.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | */ | |
6 | ||
7 | /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */ | |
8 | /* | |
9 | * Wirzenius wrote this portably, Torvalds fucked it up :-) | |
10 | */ | |
11 | ||
7b9186f5 | 12 | /* |
1da177e4 LT |
13 | * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com> |
14 | * - changed to provide snprintf and vsnprintf functions | |
15 | * So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de> | |
16 | * - scnprintf and vscnprintf | |
17 | */ | |
18 | ||
19 | #include <stdarg.h> | |
ef27ac18 | 20 | #include <linux/build_bug.h> |
0d1d7a55 | 21 | #include <linux/clk.h> |
900cca29 | 22 | #include <linux/clk-provider.h> |
8bc3bcc9 | 23 | #include <linux/module.h> /* for KSYM_SYMBOL_LEN */ |
1da177e4 LT |
24 | #include <linux/types.h> |
25 | #include <linux/string.h> | |
26 | #include <linux/ctype.h> | |
27 | #include <linux/kernel.h> | |
0fe1ef24 | 28 | #include <linux/kallsyms.h> |
53809751 | 29 | #include <linux/math64.h> |
0fe1ef24 | 30 | #include <linux/uaccess.h> |
332d2e78 | 31 | #include <linux/ioport.h> |
4b6ccca7 | 32 | #include <linux/dcache.h> |
312b4e22 | 33 | #include <linux/cred.h> |
4d42c447 | 34 | #include <linux/rtc.h> |
2b1b0d66 | 35 | #include <linux/uuid.h> |
ce4fecf1 | 36 | #include <linux/of.h> |
8a27f7c9 | 37 | #include <net/addrconf.h> |
ad67b74d TH |
38 | #include <linux/siphash.h> |
39 | #include <linux/compiler.h> | |
1031bc58 DM |
40 | #ifdef CONFIG_BLOCK |
41 | #include <linux/blkdev.h> | |
42 | #endif | |
1da177e4 | 43 | |
edf14cdb VB |
44 | #include "../mm/internal.h" /* For the trace_print_flags arrays */ |
45 | ||
4e57b681 | 46 | #include <asm/page.h> /* for PAGE_SIZE */ |
7c43d9a3 | 47 | #include <asm/byteorder.h> /* cpu_to_le16 */ |
1da177e4 | 48 | |
71dca95d | 49 | #include <linux/string_helpers.h> |
1dff46d6 | 50 | #include "kstrtox.h" |
aa46a63e | 51 | |
1da177e4 | 52 | /** |
922ac25c | 53 | * simple_strtoull - convert a string to an unsigned long long |
1da177e4 LT |
54 | * @cp: The start of the string |
55 | * @endp: A pointer to the end of the parsed string will be placed here | |
56 | * @base: The number base to use | |
462e4711 EZ |
57 | * |
58 | * This function is obsolete. Please use kstrtoull instead. | |
1da177e4 | 59 | */ |
922ac25c | 60 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
1da177e4 | 61 | { |
1dff46d6 AD |
62 | unsigned long long result; |
63 | unsigned int rv; | |
aa46a63e | 64 | |
1dff46d6 AD |
65 | cp = _parse_integer_fixup_radix(cp, &base); |
66 | rv = _parse_integer(cp, base, &result); | |
67 | /* FIXME */ | |
68 | cp += (rv & ~KSTRTOX_OVERFLOW); | |
aa46a63e | 69 | |
1da177e4 LT |
70 | if (endp) |
71 | *endp = (char *)cp; | |
7b9186f5 | 72 | |
1da177e4 LT |
73 | return result; |
74 | } | |
922ac25c | 75 | EXPORT_SYMBOL(simple_strtoull); |
1da177e4 LT |
76 | |
77 | /** | |
922ac25c | 78 | * simple_strtoul - convert a string to an unsigned long |
1da177e4 LT |
79 | * @cp: The start of the string |
80 | * @endp: A pointer to the end of the parsed string will be placed here | |
81 | * @base: The number base to use | |
462e4711 EZ |
82 | * |
83 | * This function is obsolete. Please use kstrtoul instead. | |
1da177e4 | 84 | */ |
922ac25c | 85 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
1da177e4 | 86 | { |
922ac25c | 87 | return simple_strtoull(cp, endp, base); |
1da177e4 | 88 | } |
922ac25c | 89 | EXPORT_SYMBOL(simple_strtoul); |
1da177e4 LT |
90 | |
91 | /** | |
922ac25c | 92 | * simple_strtol - convert a string to a signed long |
1da177e4 LT |
93 | * @cp: The start of the string |
94 | * @endp: A pointer to the end of the parsed string will be placed here | |
95 | * @base: The number base to use | |
462e4711 EZ |
96 | * |
97 | * This function is obsolete. Please use kstrtol instead. | |
1da177e4 | 98 | */ |
922ac25c | 99 | long simple_strtol(const char *cp, char **endp, unsigned int base) |
1da177e4 | 100 | { |
922ac25c AGR |
101 | if (*cp == '-') |
102 | return -simple_strtoul(cp + 1, endp, base); | |
7b9186f5 | 103 | |
922ac25c | 104 | return simple_strtoul(cp, endp, base); |
1da177e4 | 105 | } |
922ac25c | 106 | EXPORT_SYMBOL(simple_strtol); |
1da177e4 LT |
107 | |
108 | /** | |
109 | * simple_strtoll - convert a string to a signed long long | |
110 | * @cp: The start of the string | |
111 | * @endp: A pointer to the end of the parsed string will be placed here | |
112 | * @base: The number base to use | |
462e4711 EZ |
113 | * |
114 | * This function is obsolete. Please use kstrtoll instead. | |
1da177e4 | 115 | */ |
22d27051 | 116 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
1da177e4 | 117 | { |
7b9186f5 | 118 | if (*cp == '-') |
22d27051 | 119 | return -simple_strtoull(cp + 1, endp, base); |
7b9186f5 | 120 | |
22d27051 | 121 | return simple_strtoull(cp, endp, base); |
1da177e4 | 122 | } |
98d5ce0d | 123 | EXPORT_SYMBOL(simple_strtoll); |
1da177e4 | 124 | |
cf3b429b JP |
125 | static noinline_for_stack |
126 | int skip_atoi(const char **s) | |
1da177e4 | 127 | { |
7b9186f5 | 128 | int i = 0; |
1da177e4 | 129 | |
43e5b666 | 130 | do { |
1da177e4 | 131 | i = i*10 + *((*s)++) - '0'; |
43e5b666 | 132 | } while (isdigit(**s)); |
7b9186f5 | 133 | |
1da177e4 LT |
134 | return i; |
135 | } | |
136 | ||
7c43d9a3 RV |
137 | /* |
138 | * Decimal conversion is by far the most typical, and is used for | |
139 | * /proc and /sys data. This directly impacts e.g. top performance | |
140 | * with many processes running. We optimize it for speed by emitting | |
141 | * two characters at a time, using a 200 byte lookup table. This | |
142 | * roughly halves the number of multiplications compared to computing | |
143 | * the digits one at a time. Implementation strongly inspired by the | |
144 | * previous version, which in turn used ideas described at | |
145 | * <http://www.cs.uiowa.edu/~jones/bcd/divide.html> (with permission | |
146 | * from the author, Douglas W. Jones). | |
147 | * | |
148 | * It turns out there is precisely one 26 bit fixed-point | |
149 | * approximation a of 64/100 for which x/100 == (x * (u64)a) >> 32 | |
150 | * holds for all x in [0, 10^8-1], namely a = 0x28f5c29. The actual | |
151 | * range happens to be somewhat larger (x <= 1073741898), but that's | |
152 | * irrelevant for our purpose. | |
153 | * | |
154 | * For dividing a number in the range [10^4, 10^6-1] by 100, we still | |
155 | * need a 32x32->64 bit multiply, so we simply use the same constant. | |
156 | * | |
157 | * For dividing a number in the range [100, 10^4-1] by 100, there are | |
158 | * several options. The simplest is (x * 0x147b) >> 19, which is valid | |
159 | * for all x <= 43698. | |
133fd9f5 | 160 | */ |
4277eedd | 161 | |
7c43d9a3 RV |
162 | static const u16 decpair[100] = { |
163 | #define _(x) (__force u16) cpu_to_le16(((x % 10) | ((x / 10) << 8)) + 0x3030) | |
164 | _( 0), _( 1), _( 2), _( 3), _( 4), _( 5), _( 6), _( 7), _( 8), _( 9), | |
165 | _(10), _(11), _(12), _(13), _(14), _(15), _(16), _(17), _(18), _(19), | |
166 | _(20), _(21), _(22), _(23), _(24), _(25), _(26), _(27), _(28), _(29), | |
167 | _(30), _(31), _(32), _(33), _(34), _(35), _(36), _(37), _(38), _(39), | |
168 | _(40), _(41), _(42), _(43), _(44), _(45), _(46), _(47), _(48), _(49), | |
169 | _(50), _(51), _(52), _(53), _(54), _(55), _(56), _(57), _(58), _(59), | |
170 | _(60), _(61), _(62), _(63), _(64), _(65), _(66), _(67), _(68), _(69), | |
171 | _(70), _(71), _(72), _(73), _(74), _(75), _(76), _(77), _(78), _(79), | |
172 | _(80), _(81), _(82), _(83), _(84), _(85), _(86), _(87), _(88), _(89), | |
173 | _(90), _(91), _(92), _(93), _(94), _(95), _(96), _(97), _(98), _(99), | |
174 | #undef _ | |
175 | }; | |
176 | ||
177 | /* | |
178 | * This will print a single '0' even if r == 0, since we would | |
675cf53c RV |
179 | * immediately jump to out_r where two 0s would be written but only |
180 | * one of them accounted for in buf. This is needed by ip4_string | |
181 | * below. All other callers pass a non-zero value of r. | |
7c43d9a3 | 182 | */ |
cf3b429b | 183 | static noinline_for_stack |
7c43d9a3 | 184 | char *put_dec_trunc8(char *buf, unsigned r) |
4277eedd | 185 | { |
7c43d9a3 RV |
186 | unsigned q; |
187 | ||
188 | /* 1 <= r < 10^8 */ | |
189 | if (r < 100) | |
190 | goto out_r; | |
191 | ||
192 | /* 100 <= r < 10^8 */ | |
193 | q = (r * (u64)0x28f5c29) >> 32; | |
194 | *((u16 *)buf) = decpair[r - 100*q]; | |
195 | buf += 2; | |
196 | ||
197 | /* 1 <= q < 10^6 */ | |
198 | if (q < 100) | |
199 | goto out_q; | |
200 | ||
201 | /* 100 <= q < 10^6 */ | |
202 | r = (q * (u64)0x28f5c29) >> 32; | |
203 | *((u16 *)buf) = decpair[q - 100*r]; | |
204 | buf += 2; | |
205 | ||
206 | /* 1 <= r < 10^4 */ | |
207 | if (r < 100) | |
208 | goto out_r; | |
209 | ||
210 | /* 100 <= r < 10^4 */ | |
211 | q = (r * 0x147b) >> 19; | |
212 | *((u16 *)buf) = decpair[r - 100*q]; | |
213 | buf += 2; | |
214 | out_q: | |
215 | /* 1 <= q < 100 */ | |
216 | r = q; | |
217 | out_r: | |
218 | /* 1 <= r < 100 */ | |
219 | *((u16 *)buf) = decpair[r]; | |
675cf53c | 220 | buf += r < 10 ? 1 : 2; |
4277eedd DV |
221 | return buf; |
222 | } | |
133fd9f5 | 223 | |
7c43d9a3 | 224 | #if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG == 64 |
cf3b429b | 225 | static noinline_for_stack |
7c43d9a3 | 226 | char *put_dec_full8(char *buf, unsigned r) |
4277eedd | 227 | { |
133fd9f5 DV |
228 | unsigned q; |
229 | ||
7c43d9a3 RV |
230 | /* 0 <= r < 10^8 */ |
231 | q = (r * (u64)0x28f5c29) >> 32; | |
232 | *((u16 *)buf) = decpair[r - 100*q]; | |
233 | buf += 2; | |
4277eedd | 234 | |
7c43d9a3 RV |
235 | /* 0 <= q < 10^6 */ |
236 | r = (q * (u64)0x28f5c29) >> 32; | |
237 | *((u16 *)buf) = decpair[q - 100*r]; | |
238 | buf += 2; | |
7b9186f5 | 239 | |
7c43d9a3 RV |
240 | /* 0 <= r < 10^4 */ |
241 | q = (r * 0x147b) >> 19; | |
242 | *((u16 *)buf) = decpair[r - 100*q]; | |
243 | buf += 2; | |
133fd9f5 | 244 | |
7c43d9a3 RV |
245 | /* 0 <= q < 100 */ |
246 | *((u16 *)buf) = decpair[q]; | |
247 | buf += 2; | |
248 | return buf; | |
249 | } | |
133fd9f5 | 250 | |
7c43d9a3 | 251 | static noinline_for_stack |
133fd9f5 DV |
252 | char *put_dec(char *buf, unsigned long long n) |
253 | { | |
7c43d9a3 RV |
254 | if (n >= 100*1000*1000) |
255 | buf = put_dec_full8(buf, do_div(n, 100*1000*1000)); | |
256 | /* 1 <= n <= 1.6e11 */ | |
257 | if (n >= 100*1000*1000) | |
258 | buf = put_dec_full8(buf, do_div(n, 100*1000*1000)); | |
259 | /* 1 <= n < 1e8 */ | |
133fd9f5 | 260 | return put_dec_trunc8(buf, n); |
4277eedd | 261 | } |
133fd9f5 | 262 | |
7c43d9a3 | 263 | #elif BITS_PER_LONG == 32 && BITS_PER_LONG_LONG == 64 |
133fd9f5 | 264 | |
7c43d9a3 RV |
265 | static void |
266 | put_dec_full4(char *buf, unsigned r) | |
4277eedd | 267 | { |
7c43d9a3 RV |
268 | unsigned q; |
269 | ||
270 | /* 0 <= r < 10^4 */ | |
271 | q = (r * 0x147b) >> 19; | |
272 | *((u16 *)buf) = decpair[r - 100*q]; | |
273 | buf += 2; | |
274 | /* 0 <= q < 100 */ | |
275 | *((u16 *)buf) = decpair[q]; | |
2359172a GS |
276 | } |
277 | ||
278 | /* | |
279 | * Call put_dec_full4 on x % 10000, return x / 10000. | |
280 | * The approximation x/10000 == (x * 0x346DC5D7) >> 43 | |
281 | * holds for all x < 1,128,869,999. The largest value this | |
282 | * helper will ever be asked to convert is 1,125,520,955. | |
7c43d9a3 | 283 | * (second call in the put_dec code, assuming n is all-ones). |
2359172a | 284 | */ |
7c43d9a3 | 285 | static noinline_for_stack |
2359172a GS |
286 | unsigned put_dec_helper4(char *buf, unsigned x) |
287 | { | |
288 | uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43; | |
289 | ||
290 | put_dec_full4(buf, x - q * 10000); | |
291 | return q; | |
4277eedd DV |
292 | } |
293 | ||
133fd9f5 DV |
294 | /* Based on code by Douglas W. Jones found at |
295 | * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour> | |
296 | * (with permission from the author). | |
297 | * Performs no 64-bit division and hence should be fast on 32-bit machines. | |
298 | */ | |
299 | static | |
300 | char *put_dec(char *buf, unsigned long long n) | |
301 | { | |
302 | uint32_t d3, d2, d1, q, h; | |
303 | ||
304 | if (n < 100*1000*1000) | |
305 | return put_dec_trunc8(buf, n); | |
306 | ||
307 | d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */ | |
308 | h = (n >> 32); | |
309 | d2 = (h ) & 0xffff; | |
310 | d3 = (h >> 16); /* implicit "& 0xffff" */ | |
311 | ||
7c43d9a3 RV |
312 | /* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0 |
313 | = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */ | |
133fd9f5 | 314 | q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff); |
2359172a GS |
315 | q = put_dec_helper4(buf, q); |
316 | ||
317 | q += 7671 * d3 + 9496 * d2 + 6 * d1; | |
318 | q = put_dec_helper4(buf+4, q); | |
319 | ||
320 | q += 4749 * d3 + 42 * d2; | |
321 | q = put_dec_helper4(buf+8, q); | |
133fd9f5 | 322 | |
2359172a GS |
323 | q += 281 * d3; |
324 | buf += 12; | |
325 | if (q) | |
326 | buf = put_dec_trunc8(buf, q); | |
327 | else while (buf[-1] == '0') | |
133fd9f5 DV |
328 | --buf; |
329 | ||
330 | return buf; | |
331 | } | |
332 | ||
333 | #endif | |
334 | ||
1ac101a5 KH |
335 | /* |
336 | * Convert passed number to decimal string. | |
337 | * Returns the length of string. On buffer overflow, returns 0. | |
338 | * | |
339 | * If speed is not important, use snprintf(). It's easy to read the code. | |
340 | */ | |
d1be35cb | 341 | int num_to_str(char *buf, int size, unsigned long long num, unsigned int width) |
1ac101a5 | 342 | { |
7c43d9a3 RV |
343 | /* put_dec requires 2-byte alignment of the buffer. */ |
344 | char tmp[sizeof(num) * 3] __aligned(2); | |
1ac101a5 KH |
345 | int idx, len; |
346 | ||
133fd9f5 DV |
347 | /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */ |
348 | if (num <= 9) { | |
349 | tmp[0] = '0' + num; | |
350 | len = 1; | |
351 | } else { | |
352 | len = put_dec(tmp, num) - tmp; | |
353 | } | |
1ac101a5 | 354 | |
d1be35cb | 355 | if (len > size || width > size) |
1ac101a5 | 356 | return 0; |
d1be35cb AV |
357 | |
358 | if (width > len) { | |
359 | width = width - len; | |
360 | for (idx = 0; idx < width; idx++) | |
361 | buf[idx] = ' '; | |
362 | } else { | |
363 | width = 0; | |
364 | } | |
365 | ||
1ac101a5 | 366 | for (idx = 0; idx < len; ++idx) |
d1be35cb AV |
367 | buf[idx + width] = tmp[len - idx - 1]; |
368 | ||
369 | return len + width; | |
1ac101a5 KH |
370 | } |
371 | ||
51be17df | 372 | #define SIGN 1 /* unsigned/signed, must be 1 */ |
d1c1b121 | 373 | #define LEFT 2 /* left justified */ |
1da177e4 LT |
374 | #define PLUS 4 /* show plus */ |
375 | #define SPACE 8 /* space if plus */ | |
d1c1b121 | 376 | #define ZEROPAD 16 /* pad with zero, must be 16 == '0' - ' ' */ |
b89dc5d6 BH |
377 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ |
378 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ | |
1da177e4 | 379 | |
fef20d9c FW |
380 | enum format_type { |
381 | FORMAT_TYPE_NONE, /* Just a string part */ | |
ed681a91 | 382 | FORMAT_TYPE_WIDTH, |
fef20d9c FW |
383 | FORMAT_TYPE_PRECISION, |
384 | FORMAT_TYPE_CHAR, | |
385 | FORMAT_TYPE_STR, | |
386 | FORMAT_TYPE_PTR, | |
387 | FORMAT_TYPE_PERCENT_CHAR, | |
388 | FORMAT_TYPE_INVALID, | |
389 | FORMAT_TYPE_LONG_LONG, | |
390 | FORMAT_TYPE_ULONG, | |
391 | FORMAT_TYPE_LONG, | |
a4e94ef0 Z |
392 | FORMAT_TYPE_UBYTE, |
393 | FORMAT_TYPE_BYTE, | |
fef20d9c FW |
394 | FORMAT_TYPE_USHORT, |
395 | FORMAT_TYPE_SHORT, | |
396 | FORMAT_TYPE_UINT, | |
397 | FORMAT_TYPE_INT, | |
fef20d9c FW |
398 | FORMAT_TYPE_SIZE_T, |
399 | FORMAT_TYPE_PTRDIFF | |
400 | }; | |
401 | ||
402 | struct printf_spec { | |
d0484193 RV |
403 | unsigned int type:8; /* format_type enum */ |
404 | signed int field_width:24; /* width of output field */ | |
405 | unsigned int flags:8; /* flags to number() */ | |
406 | unsigned int base:8; /* number base, 8, 10 or 16 only */ | |
407 | signed int precision:16; /* # of digits/chars */ | |
408 | } __packed; | |
ef27ac18 RV |
409 | static_assert(sizeof(struct printf_spec) == 8); |
410 | ||
4d72ba01 RV |
411 | #define FIELD_WIDTH_MAX ((1 << 23) - 1) |
412 | #define PRECISION_MAX ((1 << 15) - 1) | |
fef20d9c | 413 | |
cf3b429b JP |
414 | static noinline_for_stack |
415 | char *number(char *buf, char *end, unsigned long long num, | |
416 | struct printf_spec spec) | |
1da177e4 | 417 | { |
7c43d9a3 RV |
418 | /* put_dec requires 2-byte alignment of the buffer. */ |
419 | char tmp[3 * sizeof(num)] __aligned(2); | |
9b706aee DV |
420 | char sign; |
421 | char locase; | |
fef20d9c | 422 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
1da177e4 | 423 | int i; |
7c203422 | 424 | bool is_zero = num == 0LL; |
1c7a8e62 RV |
425 | int field_width = spec.field_width; |
426 | int precision = spec.precision; | |
1da177e4 | 427 | |
9b706aee DV |
428 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
429 | * produces same digits or (maybe lowercased) letters */ | |
fef20d9c FW |
430 | locase = (spec.flags & SMALL); |
431 | if (spec.flags & LEFT) | |
432 | spec.flags &= ~ZEROPAD; | |
1da177e4 | 433 | sign = 0; |
fef20d9c | 434 | if (spec.flags & SIGN) { |
7b9186f5 | 435 | if ((signed long long)num < 0) { |
1da177e4 | 436 | sign = '-'; |
7b9186f5 | 437 | num = -(signed long long)num; |
1c7a8e62 | 438 | field_width--; |
fef20d9c | 439 | } else if (spec.flags & PLUS) { |
1da177e4 | 440 | sign = '+'; |
1c7a8e62 | 441 | field_width--; |
fef20d9c | 442 | } else if (spec.flags & SPACE) { |
1da177e4 | 443 | sign = ' '; |
1c7a8e62 | 444 | field_width--; |
1da177e4 LT |
445 | } |
446 | } | |
b39a7340 | 447 | if (need_pfx) { |
fef20d9c | 448 | if (spec.base == 16) |
1c7a8e62 | 449 | field_width -= 2; |
7c203422 | 450 | else if (!is_zero) |
1c7a8e62 | 451 | field_width--; |
1da177e4 | 452 | } |
b39a7340 DV |
453 | |
454 | /* generate full string in tmp[], in reverse order */ | |
1da177e4 | 455 | i = 0; |
133fd9f5 | 456 | if (num < spec.base) |
3ea8d440 | 457 | tmp[i++] = hex_asc_upper[num] | locase; |
fef20d9c FW |
458 | else if (spec.base != 10) { /* 8 or 16 */ |
459 | int mask = spec.base - 1; | |
b39a7340 | 460 | int shift = 3; |
7b9186f5 AGR |
461 | |
462 | if (spec.base == 16) | |
463 | shift = 4; | |
b39a7340 | 464 | do { |
3ea8d440 | 465 | tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase); |
b39a7340 DV |
466 | num >>= shift; |
467 | } while (num); | |
4277eedd DV |
468 | } else { /* base 10 */ |
469 | i = put_dec(tmp, num) - tmp; | |
470 | } | |
b39a7340 DV |
471 | |
472 | /* printing 100 using %2d gives "100", not "00" */ | |
1c7a8e62 RV |
473 | if (i > precision) |
474 | precision = i; | |
b39a7340 | 475 | /* leading space padding */ |
1c7a8e62 | 476 | field_width -= precision; |
51be17df | 477 | if (!(spec.flags & (ZEROPAD | LEFT))) { |
1c7a8e62 | 478 | while (--field_width >= 0) { |
f796937a | 479 | if (buf < end) |
1da177e4 LT |
480 | *buf = ' '; |
481 | ++buf; | |
482 | } | |
483 | } | |
b39a7340 | 484 | /* sign */ |
1da177e4 | 485 | if (sign) { |
f796937a | 486 | if (buf < end) |
1da177e4 LT |
487 | *buf = sign; |
488 | ++buf; | |
489 | } | |
b39a7340 DV |
490 | /* "0x" / "0" prefix */ |
491 | if (need_pfx) { | |
7c203422 PC |
492 | if (spec.base == 16 || !is_zero) { |
493 | if (buf < end) | |
494 | *buf = '0'; | |
495 | ++buf; | |
496 | } | |
fef20d9c | 497 | if (spec.base == 16) { |
f796937a | 498 | if (buf < end) |
9b706aee | 499 | *buf = ('X' | locase); |
1da177e4 LT |
500 | ++buf; |
501 | } | |
502 | } | |
b39a7340 | 503 | /* zero or space padding */ |
fef20d9c | 504 | if (!(spec.flags & LEFT)) { |
d1c1b121 RV |
505 | char c = ' ' + (spec.flags & ZEROPAD); |
506 | BUILD_BUG_ON(' ' + ZEROPAD != '0'); | |
1c7a8e62 | 507 | while (--field_width >= 0) { |
f796937a | 508 | if (buf < end) |
1da177e4 LT |
509 | *buf = c; |
510 | ++buf; | |
511 | } | |
512 | } | |
b39a7340 | 513 | /* hmm even more zero padding? */ |
1c7a8e62 | 514 | while (i <= --precision) { |
f796937a | 515 | if (buf < end) |
1da177e4 LT |
516 | *buf = '0'; |
517 | ++buf; | |
518 | } | |
b39a7340 DV |
519 | /* actual digits of result */ |
520 | while (--i >= 0) { | |
f796937a | 521 | if (buf < end) |
1da177e4 LT |
522 | *buf = tmp[i]; |
523 | ++buf; | |
524 | } | |
b39a7340 | 525 | /* trailing space padding */ |
1c7a8e62 | 526 | while (--field_width >= 0) { |
f796937a | 527 | if (buf < end) |
1da177e4 LT |
528 | *buf = ' '; |
529 | ++buf; | |
530 | } | |
7b9186f5 | 531 | |
1da177e4 LT |
532 | return buf; |
533 | } | |
534 | ||
3cab1e71 AS |
535 | static noinline_for_stack |
536 | char *special_hex_number(char *buf, char *end, unsigned long long num, int size) | |
537 | { | |
538 | struct printf_spec spec; | |
539 | ||
540 | spec.type = FORMAT_TYPE_PTR; | |
541 | spec.field_width = 2 + 2 * size; /* 0x + hex */ | |
542 | spec.flags = SPECIAL | SMALL | ZEROPAD; | |
543 | spec.base = 16; | |
544 | spec.precision = -1; | |
545 | ||
546 | return number(buf, end, num, spec); | |
547 | } | |
548 | ||
cfccde04 | 549 | static void move_right(char *buf, char *end, unsigned len, unsigned spaces) |
4b6ccca7 AV |
550 | { |
551 | size_t size; | |
552 | if (buf >= end) /* nowhere to put anything */ | |
553 | return; | |
554 | size = end - buf; | |
555 | if (size <= spaces) { | |
556 | memset(buf, ' ', size); | |
557 | return; | |
558 | } | |
559 | if (len) { | |
560 | if (len > size - spaces) | |
561 | len = size - spaces; | |
562 | memmove(buf + spaces, buf, len); | |
563 | } | |
564 | memset(buf, ' ', spaces); | |
565 | } | |
566 | ||
cfccde04 RV |
567 | /* |
568 | * Handle field width padding for a string. | |
569 | * @buf: current buffer position | |
570 | * @n: length of string | |
571 | * @end: end of output buffer | |
572 | * @spec: for field width and flags | |
573 | * Returns: new buffer position after padding. | |
574 | */ | |
575 | static noinline_for_stack | |
576 | char *widen_string(char *buf, int n, char *end, struct printf_spec spec) | |
577 | { | |
578 | unsigned spaces; | |
579 | ||
580 | if (likely(n >= spec.field_width)) | |
581 | return buf; | |
582 | /* we want to pad the sucker */ | |
583 | spaces = spec.field_width - n; | |
584 | if (!(spec.flags & LEFT)) { | |
585 | move_right(buf - n, end, n, spaces); | |
586 | return buf + spaces; | |
587 | } | |
588 | while (spaces--) { | |
589 | if (buf < end) | |
590 | *buf = ' '; | |
591 | ++buf; | |
592 | } | |
593 | return buf; | |
594 | } | |
595 | ||
d529ac41 PM |
596 | /* Handle string from a well known address. */ |
597 | static char *string_nocheck(char *buf, char *end, const char *s, | |
598 | struct printf_spec spec) | |
95508cfa | 599 | { |
34fc8b90 RV |
600 | int len = 0; |
601 | size_t lim = spec.precision; | |
95508cfa | 602 | |
34fc8b90 RV |
603 | while (lim--) { |
604 | char c = *s++; | |
605 | if (!c) | |
606 | break; | |
95508cfa | 607 | if (buf < end) |
34fc8b90 | 608 | *buf = c; |
95508cfa | 609 | ++buf; |
34fc8b90 | 610 | ++len; |
95508cfa | 611 | } |
34fc8b90 | 612 | return widen_string(buf, len, end, spec); |
95508cfa RV |
613 | } |
614 | ||
c8c3b584 PM |
615 | /* Be careful: error messages must fit into the given buffer. */ |
616 | static char *error_string(char *buf, char *end, const char *s, | |
617 | struct printf_spec spec) | |
618 | { | |
619 | /* | |
620 | * Hard limit to avoid a completely insane messages. It actually | |
621 | * works pretty well because most error messages are in | |
622 | * the many pointer format modifiers. | |
623 | */ | |
624 | if (spec.precision == -1) | |
625 | spec.precision = 2 * sizeof(void *); | |
626 | ||
627 | return string_nocheck(buf, end, s, spec); | |
628 | } | |
629 | ||
3e5903eb PM |
630 | /* |
631 | * This is not a fool-proof test. 99% of the time that this will fault is | |
632 | * due to a bad pointer, not one that crosses into bad memory. Just test | |
633 | * the address to make sure it doesn't fault due to a poorly added printk | |
634 | * during debugging. | |
635 | */ | |
636 | static const char *check_pointer_msg(const void *ptr) | |
637 | { | |
638 | char byte; | |
639 | ||
640 | if (!ptr) | |
641 | return "(null)"; | |
642 | ||
643 | if (probe_kernel_address(ptr, byte)) | |
644 | return "(efault)"; | |
645 | ||
646 | return NULL; | |
647 | } | |
648 | ||
649 | static int check_pointer(char **buf, char *end, const void *ptr, | |
650 | struct printf_spec spec) | |
651 | { | |
652 | const char *err_msg; | |
653 | ||
654 | err_msg = check_pointer_msg(ptr); | |
655 | if (err_msg) { | |
c8c3b584 | 656 | *buf = error_string(*buf, end, err_msg, spec); |
3e5903eb PM |
657 | return -EFAULT; |
658 | } | |
659 | ||
660 | return 0; | |
661 | } | |
662 | ||
9073dac1 | 663 | static noinline_for_stack |
d529ac41 PM |
664 | char *string(char *buf, char *end, const char *s, |
665 | struct printf_spec spec) | |
666 | { | |
3e5903eb PM |
667 | if (check_pointer(&buf, end, s, spec)) |
668 | return buf; | |
d529ac41 PM |
669 | |
670 | return string_nocheck(buf, end, s, spec); | |
671 | } | |
672 | ||
9073dac1 GU |
673 | char *pointer_string(char *buf, char *end, const void *ptr, |
674 | struct printf_spec spec) | |
675 | { | |
676 | spec.base = 16; | |
677 | spec.flags |= SMALL; | |
678 | if (spec.field_width == -1) { | |
679 | spec.field_width = 2 * sizeof(ptr); | |
680 | spec.flags |= ZEROPAD; | |
681 | } | |
682 | ||
683 | return number(buf, end, (unsigned long int)ptr, spec); | |
684 | } | |
685 | ||
686 | /* Make pointers available for printing early in the boot sequence. */ | |
687 | static int debug_boot_weak_hash __ro_after_init; | |
688 | ||
689 | static int __init debug_boot_weak_hash_enable(char *str) | |
690 | { | |
691 | debug_boot_weak_hash = 1; | |
692 | pr_info("debug_boot_weak_hash enabled\n"); | |
693 | return 0; | |
694 | } | |
695 | early_param("debug_boot_weak_hash", debug_boot_weak_hash_enable); | |
696 | ||
697 | static DEFINE_STATIC_KEY_TRUE(not_filled_random_ptr_key); | |
698 | static siphash_key_t ptr_key __read_mostly; | |
699 | ||
700 | static void enable_ptr_key_workfn(struct work_struct *work) | |
701 | { | |
702 | get_random_bytes(&ptr_key, sizeof(ptr_key)); | |
703 | /* Needs to run from preemptible context */ | |
704 | static_branch_disable(¬_filled_random_ptr_key); | |
705 | } | |
706 | ||
707 | static DECLARE_WORK(enable_ptr_key_work, enable_ptr_key_workfn); | |
708 | ||
709 | static void fill_random_ptr_key(struct random_ready_callback *unused) | |
710 | { | |
711 | /* This may be in an interrupt handler. */ | |
712 | queue_work(system_unbound_wq, &enable_ptr_key_work); | |
713 | } | |
714 | ||
715 | static struct random_ready_callback random_ready = { | |
716 | .func = fill_random_ptr_key | |
717 | }; | |
718 | ||
719 | static int __init initialize_ptr_random(void) | |
720 | { | |
721 | int key_size = sizeof(ptr_key); | |
722 | int ret; | |
723 | ||
724 | /* Use hw RNG if available. */ | |
725 | if (get_random_bytes_arch(&ptr_key, key_size) == key_size) { | |
726 | static_branch_disable(¬_filled_random_ptr_key); | |
727 | return 0; | |
728 | } | |
729 | ||
730 | ret = add_random_ready_callback(&random_ready); | |
731 | if (!ret) { | |
732 | return 0; | |
733 | } else if (ret == -EALREADY) { | |
734 | /* This is in preemptible context */ | |
735 | enable_ptr_key_workfn(&enable_ptr_key_work); | |
736 | return 0; | |
737 | } | |
738 | ||
739 | return ret; | |
740 | } | |
741 | early_initcall(initialize_ptr_random); | |
742 | ||
743 | /* Maps a pointer to a 32 bit unique identifier. */ | |
744 | static char *ptr_to_id(char *buf, char *end, const void *ptr, | |
745 | struct printf_spec spec) | |
746 | { | |
747 | const char *str = sizeof(ptr) == 8 ? "(____ptrval____)" : "(ptrval)"; | |
748 | unsigned long hashval; | |
749 | ||
750 | /* When debugging early boot use non-cryptographically secure hash. */ | |
751 | if (unlikely(debug_boot_weak_hash)) { | |
752 | hashval = hash_long((unsigned long)ptr, 32); | |
753 | return pointer_string(buf, end, (const void *)hashval, spec); | |
754 | } | |
755 | ||
756 | if (static_branch_unlikely(¬_filled_random_ptr_key)) { | |
757 | spec.field_width = 2 * sizeof(ptr); | |
758 | /* string length must be less than default_width */ | |
c8c3b584 | 759 | return error_string(buf, end, str, spec); |
9073dac1 GU |
760 | } |
761 | ||
762 | #ifdef CONFIG_64BIT | |
763 | hashval = (unsigned long)siphash_1u64((u64)ptr, &ptr_key); | |
764 | /* | |
765 | * Mask off the first 32 bits, this makes explicit that we have | |
766 | * modified the address (and 32 bits is plenty for a unique ID). | |
767 | */ | |
768 | hashval = hashval & 0xffffffff; | |
769 | #else | |
770 | hashval = (unsigned long)siphash_1u32((u32)ptr, &ptr_key); | |
771 | #endif | |
772 | return pointer_string(buf, end, (const void *)hashval, spec); | |
773 | } | |
774 | ||
6eea242f PM |
775 | int kptr_restrict __read_mostly; |
776 | ||
777 | static noinline_for_stack | |
778 | char *restricted_pointer(char *buf, char *end, const void *ptr, | |
779 | struct printf_spec spec) | |
780 | { | |
781 | switch (kptr_restrict) { | |
782 | case 0: | |
1ac2f978 PM |
783 | /* Handle as %p, hash and do _not_ leak addresses. */ |
784 | return ptr_to_id(buf, end, ptr, spec); | |
6eea242f PM |
785 | case 1: { |
786 | const struct cred *cred; | |
787 | ||
788 | /* | |
789 | * kptr_restrict==1 cannot be used in IRQ context | |
790 | * because its test for CAP_SYSLOG would be meaningless. | |
791 | */ | |
792 | if (in_irq() || in_serving_softirq() || in_nmi()) { | |
793 | if (spec.field_width == -1) | |
794 | spec.field_width = 2 * sizeof(ptr); | |
c8c3b584 | 795 | return error_string(buf, end, "pK-error", spec); |
6eea242f PM |
796 | } |
797 | ||
798 | /* | |
799 | * Only print the real pointer value if the current | |
800 | * process has CAP_SYSLOG and is running with the | |
801 | * same credentials it started with. This is because | |
802 | * access to files is checked at open() time, but %pK | |
803 | * checks permission at read() time. We don't want to | |
804 | * leak pointer values if a binary opens a file using | |
805 | * %pK and then elevates privileges before reading it. | |
806 | */ | |
807 | cred = current_cred(); | |
808 | if (!has_capability_noaudit(current, CAP_SYSLOG) || | |
809 | !uid_eq(cred->euid, cred->uid) || | |
810 | !gid_eq(cred->egid, cred->gid)) | |
811 | ptr = NULL; | |
812 | break; | |
813 | } | |
814 | case 2: | |
815 | default: | |
816 | /* Always print 0's for %pK */ | |
817 | ptr = NULL; | |
818 | break; | |
819 | } | |
820 | ||
821 | return pointer_string(buf, end, ptr, spec); | |
822 | } | |
823 | ||
4b6ccca7 AV |
824 | static noinline_for_stack |
825 | char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec, | |
826 | const char *fmt) | |
827 | { | |
828 | const char *array[4], *s; | |
829 | const struct dentry *p; | |
830 | int depth; | |
831 | int i, n; | |
832 | ||
833 | switch (fmt[1]) { | |
834 | case '2': case '3': case '4': | |
835 | depth = fmt[1] - '0'; | |
836 | break; | |
837 | default: | |
838 | depth = 1; | |
839 | } | |
840 | ||
841 | rcu_read_lock(); | |
842 | for (i = 0; i < depth; i++, d = p) { | |
3e5903eb PM |
843 | if (check_pointer(&buf, end, d, spec)) { |
844 | rcu_read_unlock(); | |
845 | return buf; | |
846 | } | |
847 | ||
6aa7de05 MR |
848 | p = READ_ONCE(d->d_parent); |
849 | array[i] = READ_ONCE(d->d_name.name); | |
4b6ccca7 AV |
850 | if (p == d) { |
851 | if (i) | |
852 | array[i] = ""; | |
853 | i++; | |
854 | break; | |
855 | } | |
856 | } | |
857 | s = array[--i]; | |
858 | for (n = 0; n != spec.precision; n++, buf++) { | |
859 | char c = *s++; | |
860 | if (!c) { | |
861 | if (!i) | |
862 | break; | |
863 | c = '/'; | |
864 | s = array[--i]; | |
865 | } | |
866 | if (buf < end) | |
867 | *buf = c; | |
868 | } | |
869 | rcu_read_unlock(); | |
cfccde04 | 870 | return widen_string(buf, n, end, spec); |
4b6ccca7 AV |
871 | } |
872 | ||
1031bc58 DM |
873 | #ifdef CONFIG_BLOCK |
874 | static noinline_for_stack | |
875 | char *bdev_name(char *buf, char *end, struct block_device *bdev, | |
876 | struct printf_spec spec, const char *fmt) | |
877 | { | |
3e5903eb PM |
878 | struct gendisk *hd; |
879 | ||
880 | if (check_pointer(&buf, end, bdev, spec)) | |
881 | return buf; | |
882 | ||
883 | hd = bdev->bd_disk; | |
1031bc58 DM |
884 | buf = string(buf, end, hd->disk_name, spec); |
885 | if (bdev->bd_part->partno) { | |
886 | if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) { | |
887 | if (buf < end) | |
888 | *buf = 'p'; | |
889 | buf++; | |
890 | } | |
891 | buf = number(buf, end, bdev->bd_part->partno, spec); | |
892 | } | |
893 | return buf; | |
894 | } | |
895 | #endif | |
896 | ||
cf3b429b JP |
897 | static noinline_for_stack |
898 | char *symbol_string(char *buf, char *end, void *ptr, | |
b0d33c2b | 899 | struct printf_spec spec, const char *fmt) |
0fe1ef24 | 900 | { |
b0d33c2b | 901 | unsigned long value; |
0fe1ef24 LT |
902 | #ifdef CONFIG_KALLSYMS |
903 | char sym[KSYM_SYMBOL_LEN]; | |
b0d33c2b JP |
904 | #endif |
905 | ||
906 | if (fmt[1] == 'R') | |
907 | ptr = __builtin_extract_return_addr(ptr); | |
908 | value = (unsigned long)ptr; | |
909 | ||
910 | #ifdef CONFIG_KALLSYMS | |
911 | if (*fmt == 'B') | |
0f77a8d3 | 912 | sprint_backtrace(sym, value); |
b0d33c2b | 913 | else if (*fmt != 'f' && *fmt != 's') |
0c8b946e FW |
914 | sprint_symbol(sym, value); |
915 | else | |
4796dd20 | 916 | sprint_symbol_no_offset(sym, value); |
7b9186f5 | 917 | |
d529ac41 | 918 | return string_nocheck(buf, end, sym, spec); |
0fe1ef24 | 919 | #else |
3cab1e71 | 920 | return special_hex_number(buf, end, value, sizeof(void *)); |
0fe1ef24 LT |
921 | #endif |
922 | } | |
923 | ||
abd4fe62 AS |
924 | static const struct printf_spec default_str_spec = { |
925 | .field_width = -1, | |
926 | .precision = -1, | |
927 | }; | |
928 | ||
54433973 AS |
929 | static const struct printf_spec default_flag_spec = { |
930 | .base = 16, | |
931 | .precision = -1, | |
932 | .flags = SPECIAL | SMALL, | |
933 | }; | |
934 | ||
ce0b4910 AS |
935 | static const struct printf_spec default_dec_spec = { |
936 | .base = 10, | |
937 | .precision = -1, | |
938 | }; | |
939 | ||
4d42c447 AS |
940 | static const struct printf_spec default_dec02_spec = { |
941 | .base = 10, | |
942 | .field_width = 2, | |
943 | .precision = -1, | |
944 | .flags = ZEROPAD, | |
945 | }; | |
946 | ||
947 | static const struct printf_spec default_dec04_spec = { | |
948 | .base = 10, | |
949 | .field_width = 4, | |
950 | .precision = -1, | |
951 | .flags = ZEROPAD, | |
952 | }; | |
953 | ||
cf3b429b JP |
954 | static noinline_for_stack |
955 | char *resource_string(char *buf, char *end, struct resource *res, | |
956 | struct printf_spec spec, const char *fmt) | |
332d2e78 LT |
957 | { |
958 | #ifndef IO_RSRC_PRINTK_SIZE | |
28405372 | 959 | #define IO_RSRC_PRINTK_SIZE 6 |
332d2e78 LT |
960 | #endif |
961 | ||
962 | #ifndef MEM_RSRC_PRINTK_SIZE | |
28405372 | 963 | #define MEM_RSRC_PRINTK_SIZE 10 |
332d2e78 | 964 | #endif |
4da0b66c | 965 | static const struct printf_spec io_spec = { |
fef20d9c | 966 | .base = 16, |
4da0b66c | 967 | .field_width = IO_RSRC_PRINTK_SIZE, |
fef20d9c FW |
968 | .precision = -1, |
969 | .flags = SPECIAL | SMALL | ZEROPAD, | |
970 | }; | |
4da0b66c BH |
971 | static const struct printf_spec mem_spec = { |
972 | .base = 16, | |
973 | .field_width = MEM_RSRC_PRINTK_SIZE, | |
974 | .precision = -1, | |
975 | .flags = SPECIAL | SMALL | ZEROPAD, | |
976 | }; | |
0f4050c7 BH |
977 | static const struct printf_spec bus_spec = { |
978 | .base = 16, | |
979 | .field_width = 2, | |
980 | .precision = -1, | |
981 | .flags = SMALL | ZEROPAD, | |
982 | }; | |
4da0b66c | 983 | static const struct printf_spec str_spec = { |
fd95541e BH |
984 | .field_width = -1, |
985 | .precision = 10, | |
986 | .flags = LEFT, | |
987 | }; | |
c7dabef8 BH |
988 | |
989 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) | |
990 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ | |
991 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) | |
992 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) | |
9d7cca04 | 993 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") |
c7dabef8 BH |
994 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") |
995 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, | |
996 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; | |
997 | ||
332d2e78 | 998 | char *p = sym, *pend = sym + sizeof(sym); |
c7dabef8 | 999 | int decode = (fmt[0] == 'R') ? 1 : 0; |
4da0b66c | 1000 | const struct printf_spec *specp; |
332d2e78 | 1001 | |
3e5903eb PM |
1002 | if (check_pointer(&buf, end, res, spec)) |
1003 | return buf; | |
1004 | ||
332d2e78 | 1005 | *p++ = '['; |
4da0b66c | 1006 | if (res->flags & IORESOURCE_IO) { |
d529ac41 | 1007 | p = string_nocheck(p, pend, "io ", str_spec); |
4da0b66c BH |
1008 | specp = &io_spec; |
1009 | } else if (res->flags & IORESOURCE_MEM) { | |
d529ac41 | 1010 | p = string_nocheck(p, pend, "mem ", str_spec); |
4da0b66c BH |
1011 | specp = &mem_spec; |
1012 | } else if (res->flags & IORESOURCE_IRQ) { | |
d529ac41 | 1013 | p = string_nocheck(p, pend, "irq ", str_spec); |
ce0b4910 | 1014 | specp = &default_dec_spec; |
4da0b66c | 1015 | } else if (res->flags & IORESOURCE_DMA) { |
d529ac41 | 1016 | p = string_nocheck(p, pend, "dma ", str_spec); |
ce0b4910 | 1017 | specp = &default_dec_spec; |
0f4050c7 | 1018 | } else if (res->flags & IORESOURCE_BUS) { |
d529ac41 | 1019 | p = string_nocheck(p, pend, "bus ", str_spec); |
0f4050c7 | 1020 | specp = &bus_spec; |
4da0b66c | 1021 | } else { |
d529ac41 | 1022 | p = string_nocheck(p, pend, "??? ", str_spec); |
4da0b66c | 1023 | specp = &mem_spec; |
c7dabef8 | 1024 | decode = 0; |
fd95541e | 1025 | } |
d19cb803 | 1026 | if (decode && res->flags & IORESOURCE_UNSET) { |
d529ac41 | 1027 | p = string_nocheck(p, pend, "size ", str_spec); |
d19cb803 BH |
1028 | p = number(p, pend, resource_size(res), *specp); |
1029 | } else { | |
1030 | p = number(p, pend, res->start, *specp); | |
1031 | if (res->start != res->end) { | |
1032 | *p++ = '-'; | |
1033 | p = number(p, pend, res->end, *specp); | |
1034 | } | |
c91d3376 | 1035 | } |
c7dabef8 | 1036 | if (decode) { |
fd95541e | 1037 | if (res->flags & IORESOURCE_MEM_64) |
d529ac41 | 1038 | p = string_nocheck(p, pend, " 64bit", str_spec); |
fd95541e | 1039 | if (res->flags & IORESOURCE_PREFETCH) |
d529ac41 | 1040 | p = string_nocheck(p, pend, " pref", str_spec); |
9d7cca04 | 1041 | if (res->flags & IORESOURCE_WINDOW) |
d529ac41 | 1042 | p = string_nocheck(p, pend, " window", str_spec); |
fd95541e | 1043 | if (res->flags & IORESOURCE_DISABLED) |
d529ac41 | 1044 | p = string_nocheck(p, pend, " disabled", str_spec); |
c7dabef8 | 1045 | } else { |
d529ac41 | 1046 | p = string_nocheck(p, pend, " flags ", str_spec); |
54433973 | 1047 | p = number(p, pend, res->flags, default_flag_spec); |
fd95541e | 1048 | } |
332d2e78 | 1049 | *p++ = ']'; |
c7dabef8 | 1050 | *p = '\0'; |
332d2e78 | 1051 | |
d529ac41 | 1052 | return string_nocheck(buf, end, sym, spec); |
332d2e78 LT |
1053 | } |
1054 | ||
31550a16 AS |
1055 | static noinline_for_stack |
1056 | char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
1057 | const char *fmt) | |
1058 | { | |
360603a1 | 1059 | int i, len = 1; /* if we pass '%ph[CDN]', field width remains |
31550a16 AS |
1060 | negative value, fallback to the default */ |
1061 | char separator; | |
1062 | ||
1063 | if (spec.field_width == 0) | |
1064 | /* nothing to print */ | |
1065 | return buf; | |
1066 | ||
3e5903eb PM |
1067 | if (check_pointer(&buf, end, addr, spec)) |
1068 | return buf; | |
31550a16 AS |
1069 | |
1070 | switch (fmt[1]) { | |
1071 | case 'C': | |
1072 | separator = ':'; | |
1073 | break; | |
1074 | case 'D': | |
1075 | separator = '-'; | |
1076 | break; | |
1077 | case 'N': | |
1078 | separator = 0; | |
1079 | break; | |
1080 | default: | |
1081 | separator = ' '; | |
1082 | break; | |
1083 | } | |
1084 | ||
1085 | if (spec.field_width > 0) | |
1086 | len = min_t(int, spec.field_width, 64); | |
1087 | ||
9c98f235 RV |
1088 | for (i = 0; i < len; ++i) { |
1089 | if (buf < end) | |
1090 | *buf = hex_asc_hi(addr[i]); | |
1091 | ++buf; | |
1092 | if (buf < end) | |
1093 | *buf = hex_asc_lo(addr[i]); | |
1094 | ++buf; | |
31550a16 | 1095 | |
9c98f235 RV |
1096 | if (separator && i != len - 1) { |
1097 | if (buf < end) | |
1098 | *buf = separator; | |
1099 | ++buf; | |
1100 | } | |
31550a16 AS |
1101 | } |
1102 | ||
1103 | return buf; | |
1104 | } | |
1105 | ||
dbc760bc TH |
1106 | static noinline_for_stack |
1107 | char *bitmap_string(char *buf, char *end, unsigned long *bitmap, | |
1108 | struct printf_spec spec, const char *fmt) | |
1109 | { | |
1110 | const int CHUNKSZ = 32; | |
1111 | int nr_bits = max_t(int, spec.field_width, 0); | |
1112 | int i, chunksz; | |
1113 | bool first = true; | |
1114 | ||
3e5903eb PM |
1115 | if (check_pointer(&buf, end, bitmap, spec)) |
1116 | return buf; | |
1117 | ||
dbc760bc TH |
1118 | /* reused to print numbers */ |
1119 | spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 }; | |
1120 | ||
1121 | chunksz = nr_bits & (CHUNKSZ - 1); | |
1122 | if (chunksz == 0) | |
1123 | chunksz = CHUNKSZ; | |
1124 | ||
1125 | i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ; | |
1126 | for (; i >= 0; i -= CHUNKSZ) { | |
1127 | u32 chunkmask, val; | |
1128 | int word, bit; | |
1129 | ||
1130 | chunkmask = ((1ULL << chunksz) - 1); | |
1131 | word = i / BITS_PER_LONG; | |
1132 | bit = i % BITS_PER_LONG; | |
1133 | val = (bitmap[word] >> bit) & chunkmask; | |
1134 | ||
1135 | if (!first) { | |
1136 | if (buf < end) | |
1137 | *buf = ','; | |
1138 | buf++; | |
1139 | } | |
1140 | first = false; | |
1141 | ||
1142 | spec.field_width = DIV_ROUND_UP(chunksz, 4); | |
1143 | buf = number(buf, end, val, spec); | |
1144 | ||
1145 | chunksz = CHUNKSZ; | |
1146 | } | |
1147 | return buf; | |
1148 | } | |
1149 | ||
1150 | static noinline_for_stack | |
1151 | char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap, | |
1152 | struct printf_spec spec, const char *fmt) | |
1153 | { | |
1154 | int nr_bits = max_t(int, spec.field_width, 0); | |
1155 | /* current bit is 'cur', most recently seen range is [rbot, rtop] */ | |
1156 | int cur, rbot, rtop; | |
1157 | bool first = true; | |
1158 | ||
3e5903eb PM |
1159 | if (check_pointer(&buf, end, bitmap, spec)) |
1160 | return buf; | |
1161 | ||
dbc760bc TH |
1162 | rbot = cur = find_first_bit(bitmap, nr_bits); |
1163 | while (cur < nr_bits) { | |
1164 | rtop = cur; | |
1165 | cur = find_next_bit(bitmap, nr_bits, cur + 1); | |
1166 | if (cur < nr_bits && cur <= rtop + 1) | |
1167 | continue; | |
1168 | ||
1169 | if (!first) { | |
1170 | if (buf < end) | |
1171 | *buf = ','; | |
1172 | buf++; | |
1173 | } | |
1174 | first = false; | |
1175 | ||
ce0b4910 | 1176 | buf = number(buf, end, rbot, default_dec_spec); |
dbc760bc TH |
1177 | if (rbot < rtop) { |
1178 | if (buf < end) | |
1179 | *buf = '-'; | |
1180 | buf++; | |
1181 | ||
ce0b4910 | 1182 | buf = number(buf, end, rtop, default_dec_spec); |
dbc760bc TH |
1183 | } |
1184 | ||
1185 | rbot = cur; | |
1186 | } | |
1187 | return buf; | |
1188 | } | |
1189 | ||
cf3b429b JP |
1190 | static noinline_for_stack |
1191 | char *mac_address_string(char *buf, char *end, u8 *addr, | |
1192 | struct printf_spec spec, const char *fmt) | |
dd45c9cf | 1193 | { |
8a27f7c9 | 1194 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; |
dd45c9cf HH |
1195 | char *p = mac_addr; |
1196 | int i; | |
bc7259a2 | 1197 | char separator; |
76597ff9 | 1198 | bool reversed = false; |
bc7259a2 | 1199 | |
3e5903eb PM |
1200 | if (check_pointer(&buf, end, addr, spec)) |
1201 | return buf; | |
1202 | ||
76597ff9 AE |
1203 | switch (fmt[1]) { |
1204 | case 'F': | |
bc7259a2 | 1205 | separator = '-'; |
76597ff9 AE |
1206 | break; |
1207 | ||
1208 | case 'R': | |
1209 | reversed = true; | |
1210 | /* fall through */ | |
1211 | ||
1212 | default: | |
bc7259a2 | 1213 | separator = ':'; |
76597ff9 | 1214 | break; |
bc7259a2 | 1215 | } |
dd45c9cf HH |
1216 | |
1217 | for (i = 0; i < 6; i++) { | |
76597ff9 AE |
1218 | if (reversed) |
1219 | p = hex_byte_pack(p, addr[5 - i]); | |
1220 | else | |
1221 | p = hex_byte_pack(p, addr[i]); | |
1222 | ||
8a27f7c9 | 1223 | if (fmt[0] == 'M' && i != 5) |
bc7259a2 | 1224 | *p++ = separator; |
dd45c9cf HH |
1225 | } |
1226 | *p = '\0'; | |
1227 | ||
d529ac41 | 1228 | return string_nocheck(buf, end, mac_addr, spec); |
dd45c9cf HH |
1229 | } |
1230 | ||
cf3b429b JP |
1231 | static noinline_for_stack |
1232 | char *ip4_string(char *p, const u8 *addr, const char *fmt) | |
8a27f7c9 JP |
1233 | { |
1234 | int i; | |
0159f24e JP |
1235 | bool leading_zeros = (fmt[0] == 'i'); |
1236 | int index; | |
1237 | int step; | |
1238 | ||
1239 | switch (fmt[2]) { | |
1240 | case 'h': | |
1241 | #ifdef __BIG_ENDIAN | |
1242 | index = 0; | |
1243 | step = 1; | |
1244 | #else | |
1245 | index = 3; | |
1246 | step = -1; | |
1247 | #endif | |
1248 | break; | |
1249 | case 'l': | |
1250 | index = 3; | |
1251 | step = -1; | |
1252 | break; | |
1253 | case 'n': | |
1254 | case 'b': | |
1255 | default: | |
1256 | index = 0; | |
1257 | step = 1; | |
1258 | break; | |
1259 | } | |
8a27f7c9 | 1260 | for (i = 0; i < 4; i++) { |
7c43d9a3 | 1261 | char temp[4] __aligned(2); /* hold each IP quad in reverse order */ |
133fd9f5 | 1262 | int digits = put_dec_trunc8(temp, addr[index]) - temp; |
8a27f7c9 JP |
1263 | if (leading_zeros) { |
1264 | if (digits < 3) | |
1265 | *p++ = '0'; | |
1266 | if (digits < 2) | |
1267 | *p++ = '0'; | |
1268 | } | |
1269 | /* reverse the digits in the quad */ | |
1270 | while (digits--) | |
1271 | *p++ = temp[digits]; | |
1272 | if (i < 3) | |
1273 | *p++ = '.'; | |
0159f24e | 1274 | index += step; |
8a27f7c9 | 1275 | } |
8a27f7c9 | 1276 | *p = '\0'; |
7b9186f5 | 1277 | |
8a27f7c9 JP |
1278 | return p; |
1279 | } | |
1280 | ||
cf3b429b JP |
1281 | static noinline_for_stack |
1282 | char *ip6_compressed_string(char *p, const char *addr) | |
689afa7d | 1283 | { |
7b9186f5 | 1284 | int i, j, range; |
8a27f7c9 JP |
1285 | unsigned char zerolength[8]; |
1286 | int longest = 1; | |
1287 | int colonpos = -1; | |
1288 | u16 word; | |
7b9186f5 | 1289 | u8 hi, lo; |
8a27f7c9 | 1290 | bool needcolon = false; |
eb78cd26 JP |
1291 | bool useIPv4; |
1292 | struct in6_addr in6; | |
1293 | ||
1294 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
1295 | ||
1296 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
8a27f7c9 JP |
1297 | |
1298 | memset(zerolength, 0, sizeof(zerolength)); | |
1299 | ||
1300 | if (useIPv4) | |
1301 | range = 6; | |
1302 | else | |
1303 | range = 8; | |
1304 | ||
1305 | /* find position of longest 0 run */ | |
1306 | for (i = 0; i < range; i++) { | |
1307 | for (j = i; j < range; j++) { | |
eb78cd26 | 1308 | if (in6.s6_addr16[j] != 0) |
8a27f7c9 JP |
1309 | break; |
1310 | zerolength[i]++; | |
1311 | } | |
1312 | } | |
1313 | for (i = 0; i < range; i++) { | |
1314 | if (zerolength[i] > longest) { | |
1315 | longest = zerolength[i]; | |
1316 | colonpos = i; | |
1317 | } | |
1318 | } | |
29cf519e JP |
1319 | if (longest == 1) /* don't compress a single 0 */ |
1320 | colonpos = -1; | |
689afa7d | 1321 | |
8a27f7c9 JP |
1322 | /* emit address */ |
1323 | for (i = 0; i < range; i++) { | |
1324 | if (i == colonpos) { | |
1325 | if (needcolon || i == 0) | |
1326 | *p++ = ':'; | |
1327 | *p++ = ':'; | |
1328 | needcolon = false; | |
1329 | i += longest - 1; | |
1330 | continue; | |
1331 | } | |
1332 | if (needcolon) { | |
1333 | *p++ = ':'; | |
1334 | needcolon = false; | |
1335 | } | |
1336 | /* hex u16 without leading 0s */ | |
eb78cd26 | 1337 | word = ntohs(in6.s6_addr16[i]); |
8a27f7c9 JP |
1338 | hi = word >> 8; |
1339 | lo = word & 0xff; | |
1340 | if (hi) { | |
1341 | if (hi > 0x0f) | |
55036ba7 | 1342 | p = hex_byte_pack(p, hi); |
8a27f7c9 JP |
1343 | else |
1344 | *p++ = hex_asc_lo(hi); | |
55036ba7 | 1345 | p = hex_byte_pack(p, lo); |
8a27f7c9 | 1346 | } |
b5ff992b | 1347 | else if (lo > 0x0f) |
55036ba7 | 1348 | p = hex_byte_pack(p, lo); |
8a27f7c9 JP |
1349 | else |
1350 | *p++ = hex_asc_lo(lo); | |
1351 | needcolon = true; | |
1352 | } | |
1353 | ||
1354 | if (useIPv4) { | |
1355 | if (needcolon) | |
1356 | *p++ = ':'; | |
0159f24e | 1357 | p = ip4_string(p, &in6.s6_addr[12], "I4"); |
8a27f7c9 | 1358 | } |
8a27f7c9 | 1359 | *p = '\0'; |
7b9186f5 | 1360 | |
8a27f7c9 JP |
1361 | return p; |
1362 | } | |
1363 | ||
cf3b429b JP |
1364 | static noinline_for_stack |
1365 | char *ip6_string(char *p, const char *addr, const char *fmt) | |
8a27f7c9 JP |
1366 | { |
1367 | int i; | |
7b9186f5 | 1368 | |
689afa7d | 1369 | for (i = 0; i < 8; i++) { |
55036ba7 AS |
1370 | p = hex_byte_pack(p, *addr++); |
1371 | p = hex_byte_pack(p, *addr++); | |
8a27f7c9 | 1372 | if (fmt[0] == 'I' && i != 7) |
689afa7d HH |
1373 | *p++ = ':'; |
1374 | } | |
1375 | *p = '\0'; | |
7b9186f5 | 1376 | |
8a27f7c9 JP |
1377 | return p; |
1378 | } | |
1379 | ||
cf3b429b JP |
1380 | static noinline_for_stack |
1381 | char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
1382 | struct printf_spec spec, const char *fmt) | |
8a27f7c9 JP |
1383 | { |
1384 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
1385 | ||
1386 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
eb78cd26 | 1387 | ip6_compressed_string(ip6_addr, addr); |
8a27f7c9 | 1388 | else |
eb78cd26 | 1389 | ip6_string(ip6_addr, addr, fmt); |
689afa7d | 1390 | |
d529ac41 | 1391 | return string_nocheck(buf, end, ip6_addr, spec); |
689afa7d HH |
1392 | } |
1393 | ||
cf3b429b JP |
1394 | static noinline_for_stack |
1395 | char *ip4_addr_string(char *buf, char *end, const u8 *addr, | |
1396 | struct printf_spec spec, const char *fmt) | |
4aa99606 | 1397 | { |
8a27f7c9 | 1398 | char ip4_addr[sizeof("255.255.255.255")]; |
4aa99606 | 1399 | |
0159f24e | 1400 | ip4_string(ip4_addr, addr, fmt); |
4aa99606 | 1401 | |
d529ac41 | 1402 | return string_nocheck(buf, end, ip4_addr, spec); |
4aa99606 HH |
1403 | } |
1404 | ||
10679643 DB |
1405 | static noinline_for_stack |
1406 | char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa, | |
1407 | struct printf_spec spec, const char *fmt) | |
1408 | { | |
1409 | bool have_p = false, have_s = false, have_f = false, have_c = false; | |
1410 | char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") + | |
1411 | sizeof(":12345") + sizeof("/123456789") + | |
1412 | sizeof("%1234567890")]; | |
1413 | char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr); | |
1414 | const u8 *addr = (const u8 *) &sa->sin6_addr; | |
1415 | char fmt6[2] = { fmt[0], '6' }; | |
1416 | u8 off = 0; | |
1417 | ||
1418 | fmt++; | |
1419 | while (isalpha(*++fmt)) { | |
1420 | switch (*fmt) { | |
1421 | case 'p': | |
1422 | have_p = true; | |
1423 | break; | |
1424 | case 'f': | |
1425 | have_f = true; | |
1426 | break; | |
1427 | case 's': | |
1428 | have_s = true; | |
1429 | break; | |
1430 | case 'c': | |
1431 | have_c = true; | |
1432 | break; | |
1433 | } | |
1434 | } | |
1435 | ||
1436 | if (have_p || have_s || have_f) { | |
1437 | *p = '['; | |
1438 | off = 1; | |
1439 | } | |
1440 | ||
1441 | if (fmt6[0] == 'I' && have_c) | |
1442 | p = ip6_compressed_string(ip6_addr + off, addr); | |
1443 | else | |
1444 | p = ip6_string(ip6_addr + off, addr, fmt6); | |
1445 | ||
1446 | if (have_p || have_s || have_f) | |
1447 | *p++ = ']'; | |
1448 | ||
1449 | if (have_p) { | |
1450 | *p++ = ':'; | |
1451 | p = number(p, pend, ntohs(sa->sin6_port), spec); | |
1452 | } | |
1453 | if (have_f) { | |
1454 | *p++ = '/'; | |
1455 | p = number(p, pend, ntohl(sa->sin6_flowinfo & | |
1456 | IPV6_FLOWINFO_MASK), spec); | |
1457 | } | |
1458 | if (have_s) { | |
1459 | *p++ = '%'; | |
1460 | p = number(p, pend, sa->sin6_scope_id, spec); | |
1461 | } | |
1462 | *p = '\0'; | |
1463 | ||
d529ac41 | 1464 | return string_nocheck(buf, end, ip6_addr, spec); |
10679643 DB |
1465 | } |
1466 | ||
1467 | static noinline_for_stack | |
1468 | char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa, | |
1469 | struct printf_spec spec, const char *fmt) | |
1470 | { | |
1471 | bool have_p = false; | |
1472 | char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")]; | |
1473 | char *pend = ip4_addr + sizeof(ip4_addr); | |
1474 | const u8 *addr = (const u8 *) &sa->sin_addr.s_addr; | |
1475 | char fmt4[3] = { fmt[0], '4', 0 }; | |
1476 | ||
1477 | fmt++; | |
1478 | while (isalpha(*++fmt)) { | |
1479 | switch (*fmt) { | |
1480 | case 'p': | |
1481 | have_p = true; | |
1482 | break; | |
1483 | case 'h': | |
1484 | case 'l': | |
1485 | case 'n': | |
1486 | case 'b': | |
1487 | fmt4[2] = *fmt; | |
1488 | break; | |
1489 | } | |
1490 | } | |
1491 | ||
1492 | p = ip4_string(ip4_addr, addr, fmt4); | |
1493 | if (have_p) { | |
1494 | *p++ = ':'; | |
1495 | p = number(p, pend, ntohs(sa->sin_port), spec); | |
1496 | } | |
1497 | *p = '\0'; | |
1498 | ||
d529ac41 | 1499 | return string_nocheck(buf, end, ip4_addr, spec); |
10679643 DB |
1500 | } |
1501 | ||
f00cc102 PM |
1502 | static noinline_for_stack |
1503 | char *ip_addr_string(char *buf, char *end, const void *ptr, | |
1504 | struct printf_spec spec, const char *fmt) | |
1505 | { | |
0b74d4d7 PM |
1506 | char *err_fmt_msg; |
1507 | ||
3e5903eb PM |
1508 | if (check_pointer(&buf, end, ptr, spec)) |
1509 | return buf; | |
1510 | ||
f00cc102 PM |
1511 | switch (fmt[1]) { |
1512 | case '6': | |
1513 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
1514 | case '4': | |
1515 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
1516 | case 'S': { | |
1517 | const union { | |
1518 | struct sockaddr raw; | |
1519 | struct sockaddr_in v4; | |
1520 | struct sockaddr_in6 v6; | |
1521 | } *sa = ptr; | |
1522 | ||
1523 | switch (sa->raw.sa_family) { | |
1524 | case AF_INET: | |
1525 | return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt); | |
1526 | case AF_INET6: | |
1527 | return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt); | |
1528 | default: | |
c8c3b584 | 1529 | return error_string(buf, end, "(einval)", spec); |
f00cc102 PM |
1530 | }} |
1531 | } | |
1532 | ||
0b74d4d7 | 1533 | err_fmt_msg = fmt[0] == 'i' ? "(%pi?)" : "(%pI?)"; |
c8c3b584 | 1534 | return error_string(buf, end, err_fmt_msg, spec); |
f00cc102 PM |
1535 | } |
1536 | ||
71dca95d AS |
1537 | static noinline_for_stack |
1538 | char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
1539 | const char *fmt) | |
1540 | { | |
1541 | bool found = true; | |
1542 | int count = 1; | |
1543 | unsigned int flags = 0; | |
1544 | int len; | |
1545 | ||
1546 | if (spec.field_width == 0) | |
1547 | return buf; /* nothing to print */ | |
1548 | ||
3e5903eb PM |
1549 | if (check_pointer(&buf, end, addr, spec)) |
1550 | return buf; | |
71dca95d AS |
1551 | |
1552 | do { | |
1553 | switch (fmt[count++]) { | |
1554 | case 'a': | |
1555 | flags |= ESCAPE_ANY; | |
1556 | break; | |
1557 | case 'c': | |
1558 | flags |= ESCAPE_SPECIAL; | |
1559 | break; | |
1560 | case 'h': | |
1561 | flags |= ESCAPE_HEX; | |
1562 | break; | |
1563 | case 'n': | |
1564 | flags |= ESCAPE_NULL; | |
1565 | break; | |
1566 | case 'o': | |
1567 | flags |= ESCAPE_OCTAL; | |
1568 | break; | |
1569 | case 'p': | |
1570 | flags |= ESCAPE_NP; | |
1571 | break; | |
1572 | case 's': | |
1573 | flags |= ESCAPE_SPACE; | |
1574 | break; | |
1575 | default: | |
1576 | found = false; | |
1577 | break; | |
1578 | } | |
1579 | } while (found); | |
1580 | ||
1581 | if (!flags) | |
1582 | flags = ESCAPE_ANY_NP; | |
1583 | ||
1584 | len = spec.field_width < 0 ? 1 : spec.field_width; | |
1585 | ||
41416f23 RV |
1586 | /* |
1587 | * string_escape_mem() writes as many characters as it can to | |
1588 | * the given buffer, and returns the total size of the output | |
1589 | * had the buffer been big enough. | |
1590 | */ | |
1591 | buf += string_escape_mem(addr, len, buf, buf < end ? end - buf : 0, flags, NULL); | |
71dca95d AS |
1592 | |
1593 | return buf; | |
1594 | } | |
1595 | ||
3e5903eb PM |
1596 | static char *va_format(char *buf, char *end, struct va_format *va_fmt, |
1597 | struct printf_spec spec, const char *fmt) | |
45c3e93d PM |
1598 | { |
1599 | va_list va; | |
1600 | ||
3e5903eb PM |
1601 | if (check_pointer(&buf, end, va_fmt, spec)) |
1602 | return buf; | |
1603 | ||
45c3e93d PM |
1604 | va_copy(va, *va_fmt->va); |
1605 | buf += vsnprintf(buf, end > buf ? end - buf : 0, va_fmt->fmt, va); | |
1606 | va_end(va); | |
1607 | ||
1608 | return buf; | |
1609 | } | |
1610 | ||
cf3b429b JP |
1611 | static noinline_for_stack |
1612 | char *uuid_string(char *buf, char *end, const u8 *addr, | |
1613 | struct printf_spec spec, const char *fmt) | |
9ac6e44e | 1614 | { |
2b1b0d66 | 1615 | char uuid[UUID_STRING_LEN + 1]; |
9ac6e44e JP |
1616 | char *p = uuid; |
1617 | int i; | |
f9727a17 | 1618 | const u8 *index = uuid_index; |
9ac6e44e JP |
1619 | bool uc = false; |
1620 | ||
3e5903eb PM |
1621 | if (check_pointer(&buf, end, addr, spec)) |
1622 | return buf; | |
1623 | ||
9ac6e44e JP |
1624 | switch (*(++fmt)) { |
1625 | case 'L': | |
1626 | uc = true; /* fall-through */ | |
1627 | case 'l': | |
f9727a17 | 1628 | index = guid_index; |
9ac6e44e JP |
1629 | break; |
1630 | case 'B': | |
1631 | uc = true; | |
1632 | break; | |
1633 | } | |
1634 | ||
1635 | for (i = 0; i < 16; i++) { | |
aa4ea1c3 AS |
1636 | if (uc) |
1637 | p = hex_byte_pack_upper(p, addr[index[i]]); | |
1638 | else | |
1639 | p = hex_byte_pack(p, addr[index[i]]); | |
9ac6e44e JP |
1640 | switch (i) { |
1641 | case 3: | |
1642 | case 5: | |
1643 | case 7: | |
1644 | case 9: | |
1645 | *p++ = '-'; | |
1646 | break; | |
1647 | } | |
1648 | } | |
1649 | ||
1650 | *p = 0; | |
1651 | ||
d529ac41 | 1652 | return string_nocheck(buf, end, uuid, spec); |
9ac6e44e JP |
1653 | } |
1654 | ||
5b17aecf | 1655 | static noinline_for_stack |
431bca24 GU |
1656 | char *netdev_bits(char *buf, char *end, const void *addr, |
1657 | struct printf_spec spec, const char *fmt) | |
c8f44aff | 1658 | { |
5b17aecf AS |
1659 | unsigned long long num; |
1660 | int size; | |
1661 | ||
3e5903eb PM |
1662 | if (check_pointer(&buf, end, addr, spec)) |
1663 | return buf; | |
1664 | ||
5b17aecf AS |
1665 | switch (fmt[1]) { |
1666 | case 'F': | |
1667 | num = *(const netdev_features_t *)addr; | |
1668 | size = sizeof(netdev_features_t); | |
1669 | break; | |
1670 | default: | |
c8c3b584 | 1671 | return error_string(buf, end, "(%pN?)", spec); |
5b17aecf | 1672 | } |
c8f44aff | 1673 | |
3cab1e71 | 1674 | return special_hex_number(buf, end, num, size); |
c8f44aff MM |
1675 | } |
1676 | ||
aaf07621 | 1677 | static noinline_for_stack |
3e5903eb PM |
1678 | char *address_val(char *buf, char *end, const void *addr, |
1679 | struct printf_spec spec, const char *fmt) | |
aaf07621 JP |
1680 | { |
1681 | unsigned long long num; | |
3cab1e71 | 1682 | int size; |
aaf07621 | 1683 | |
3e5903eb PM |
1684 | if (check_pointer(&buf, end, addr, spec)) |
1685 | return buf; | |
1686 | ||
aaf07621 JP |
1687 | switch (fmt[1]) { |
1688 | case 'd': | |
1689 | num = *(const dma_addr_t *)addr; | |
3cab1e71 | 1690 | size = sizeof(dma_addr_t); |
aaf07621 JP |
1691 | break; |
1692 | case 'p': | |
1693 | default: | |
1694 | num = *(const phys_addr_t *)addr; | |
3cab1e71 | 1695 | size = sizeof(phys_addr_t); |
aaf07621 JP |
1696 | break; |
1697 | } | |
1698 | ||
3cab1e71 | 1699 | return special_hex_number(buf, end, num, size); |
aaf07621 JP |
1700 | } |
1701 | ||
4d42c447 AS |
1702 | static noinline_for_stack |
1703 | char *date_str(char *buf, char *end, const struct rtc_time *tm, bool r) | |
1704 | { | |
1705 | int year = tm->tm_year + (r ? 0 : 1900); | |
1706 | int mon = tm->tm_mon + (r ? 0 : 1); | |
1707 | ||
1708 | buf = number(buf, end, year, default_dec04_spec); | |
1709 | if (buf < end) | |
1710 | *buf = '-'; | |
1711 | buf++; | |
1712 | ||
1713 | buf = number(buf, end, mon, default_dec02_spec); | |
1714 | if (buf < end) | |
1715 | *buf = '-'; | |
1716 | buf++; | |
1717 | ||
1718 | return number(buf, end, tm->tm_mday, default_dec02_spec); | |
1719 | } | |
1720 | ||
1721 | static noinline_for_stack | |
1722 | char *time_str(char *buf, char *end, const struct rtc_time *tm, bool r) | |
1723 | { | |
1724 | buf = number(buf, end, tm->tm_hour, default_dec02_spec); | |
1725 | if (buf < end) | |
1726 | *buf = ':'; | |
1727 | buf++; | |
1728 | ||
1729 | buf = number(buf, end, tm->tm_min, default_dec02_spec); | |
1730 | if (buf < end) | |
1731 | *buf = ':'; | |
1732 | buf++; | |
1733 | ||
1734 | return number(buf, end, tm->tm_sec, default_dec02_spec); | |
1735 | } | |
1736 | ||
1737 | static noinline_for_stack | |
3e5903eb PM |
1738 | char *rtc_str(char *buf, char *end, const struct rtc_time *tm, |
1739 | struct printf_spec spec, const char *fmt) | |
4d42c447 AS |
1740 | { |
1741 | bool have_t = true, have_d = true; | |
1742 | bool raw = false; | |
1743 | int count = 2; | |
1744 | ||
3e5903eb PM |
1745 | if (check_pointer(&buf, end, tm, spec)) |
1746 | return buf; | |
1747 | ||
4d42c447 AS |
1748 | switch (fmt[count]) { |
1749 | case 'd': | |
1750 | have_t = false; | |
1751 | count++; | |
1752 | break; | |
1753 | case 't': | |
1754 | have_d = false; | |
1755 | count++; | |
1756 | break; | |
1757 | } | |
1758 | ||
1759 | raw = fmt[count] == 'r'; | |
1760 | ||
1761 | if (have_d) | |
1762 | buf = date_str(buf, end, tm, raw); | |
1763 | if (have_d && have_t) { | |
1764 | /* Respect ISO 8601 */ | |
1765 | if (buf < end) | |
1766 | *buf = 'T'; | |
1767 | buf++; | |
1768 | } | |
1769 | if (have_t) | |
1770 | buf = time_str(buf, end, tm, raw); | |
1771 | ||
1772 | return buf; | |
1773 | } | |
1774 | ||
1775 | static noinline_for_stack | |
1776 | char *time_and_date(char *buf, char *end, void *ptr, struct printf_spec spec, | |
1777 | const char *fmt) | |
1778 | { | |
1779 | switch (fmt[1]) { | |
1780 | case 'R': | |
3e5903eb | 1781 | return rtc_str(buf, end, (const struct rtc_time *)ptr, spec, fmt); |
4d42c447 | 1782 | default: |
c8c3b584 | 1783 | return error_string(buf, end, "(%ptR?)", spec); |
4d42c447 AS |
1784 | } |
1785 | } | |
1786 | ||
900cca29 GU |
1787 | static noinline_for_stack |
1788 | char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec, | |
1789 | const char *fmt) | |
1790 | { | |
0b74d4d7 | 1791 | if (!IS_ENABLED(CONFIG_HAVE_CLK)) |
c8c3b584 | 1792 | return error_string(buf, end, "(%pC?)", spec); |
0b74d4d7 | 1793 | |
3e5903eb PM |
1794 | if (check_pointer(&buf, end, clk, spec)) |
1795 | return buf; | |
900cca29 GU |
1796 | |
1797 | switch (fmt[1]) { | |
900cca29 GU |
1798 | case 'n': |
1799 | default: | |
1800 | #ifdef CONFIG_COMMON_CLK | |
1801 | return string(buf, end, __clk_get_name(clk), spec); | |
1802 | #else | |
c8c3b584 | 1803 | return error_string(buf, end, "(%pC?)", spec); |
900cca29 GU |
1804 | #endif |
1805 | } | |
1806 | } | |
1807 | ||
edf14cdb VB |
1808 | static |
1809 | char *format_flags(char *buf, char *end, unsigned long flags, | |
1810 | const struct trace_print_flags *names) | |
1811 | { | |
1812 | unsigned long mask; | |
edf14cdb VB |
1813 | |
1814 | for ( ; flags && names->name; names++) { | |
1815 | mask = names->mask; | |
1816 | if ((flags & mask) != mask) | |
1817 | continue; | |
1818 | ||
abd4fe62 | 1819 | buf = string(buf, end, names->name, default_str_spec); |
edf14cdb VB |
1820 | |
1821 | flags &= ~mask; | |
1822 | if (flags) { | |
1823 | if (buf < end) | |
1824 | *buf = '|'; | |
1825 | buf++; | |
1826 | } | |
1827 | } | |
1828 | ||
1829 | if (flags) | |
54433973 | 1830 | buf = number(buf, end, flags, default_flag_spec); |
edf14cdb VB |
1831 | |
1832 | return buf; | |
1833 | } | |
1834 | ||
1835 | static noinline_for_stack | |
0b74d4d7 PM |
1836 | char *flags_string(char *buf, char *end, void *flags_ptr, |
1837 | struct printf_spec spec, const char *fmt) | |
edf14cdb VB |
1838 | { |
1839 | unsigned long flags; | |
1840 | const struct trace_print_flags *names; | |
1841 | ||
3e5903eb PM |
1842 | if (check_pointer(&buf, end, flags_ptr, spec)) |
1843 | return buf; | |
1844 | ||
edf14cdb VB |
1845 | switch (fmt[1]) { |
1846 | case 'p': | |
1847 | flags = *(unsigned long *)flags_ptr; | |
1848 | /* Remove zone id */ | |
1849 | flags &= (1UL << NR_PAGEFLAGS) - 1; | |
1850 | names = pageflag_names; | |
1851 | break; | |
1852 | case 'v': | |
1853 | flags = *(unsigned long *)flags_ptr; | |
1854 | names = vmaflag_names; | |
1855 | break; | |
1856 | case 'g': | |
1857 | flags = *(gfp_t *)flags_ptr; | |
1858 | names = gfpflag_names; | |
1859 | break; | |
1860 | default: | |
c8c3b584 | 1861 | return error_string(buf, end, "(%pG?)", spec); |
edf14cdb VB |
1862 | } |
1863 | ||
1864 | return format_flags(buf, end, flags, names); | |
1865 | } | |
1866 | ||
ce4fecf1 PA |
1867 | static const char *device_node_name_for_depth(const struct device_node *np, int depth) |
1868 | { | |
1869 | for ( ; np && depth; depth--) | |
1870 | np = np->parent; | |
1871 | ||
1872 | return kbasename(np->full_name); | |
1873 | } | |
1874 | ||
1875 | static noinline_for_stack | |
1876 | char *device_node_gen_full_name(const struct device_node *np, char *buf, char *end) | |
1877 | { | |
1878 | int depth; | |
1879 | const struct device_node *parent = np->parent; | |
ce4fecf1 PA |
1880 | |
1881 | /* special case for root node */ | |
1882 | if (!parent) | |
d529ac41 | 1883 | return string_nocheck(buf, end, "/", default_str_spec); |
ce4fecf1 PA |
1884 | |
1885 | for (depth = 0; parent->parent; depth++) | |
1886 | parent = parent->parent; | |
1887 | ||
1888 | for ( ; depth >= 0; depth--) { | |
d529ac41 | 1889 | buf = string_nocheck(buf, end, "/", default_str_spec); |
ce4fecf1 | 1890 | buf = string(buf, end, device_node_name_for_depth(np, depth), |
abd4fe62 | 1891 | default_str_spec); |
ce4fecf1 PA |
1892 | } |
1893 | return buf; | |
1894 | } | |
1895 | ||
1896 | static noinline_for_stack | |
1897 | char *device_node_string(char *buf, char *end, struct device_node *dn, | |
1898 | struct printf_spec spec, const char *fmt) | |
1899 | { | |
1900 | char tbuf[sizeof("xxxx") + 1]; | |
1901 | const char *p; | |
1902 | int ret; | |
1903 | char *buf_start = buf; | |
1904 | struct property *prop; | |
1905 | bool has_mult, pass; | |
1906 | static const struct printf_spec num_spec = { | |
1907 | .flags = SMALL, | |
1908 | .field_width = -1, | |
1909 | .precision = -1, | |
1910 | .base = 10, | |
1911 | }; | |
1912 | ||
1913 | struct printf_spec str_spec = spec; | |
1914 | str_spec.field_width = -1; | |
1915 | ||
1916 | if (!IS_ENABLED(CONFIG_OF)) | |
c8c3b584 | 1917 | return error_string(buf, end, "(%pOF?)", spec); |
ce4fecf1 | 1918 | |
3e5903eb PM |
1919 | if (check_pointer(&buf, end, dn, spec)) |
1920 | return buf; | |
ce4fecf1 PA |
1921 | |
1922 | /* simple case without anything any more format specifiers */ | |
1923 | fmt++; | |
1924 | if (fmt[0] == '\0' || strcspn(fmt,"fnpPFcC") > 0) | |
1925 | fmt = "f"; | |
1926 | ||
1927 | for (pass = false; strspn(fmt,"fnpPFcC"); fmt++, pass = true) { | |
6d0a70a2 | 1928 | int precision; |
ce4fecf1 PA |
1929 | if (pass) { |
1930 | if (buf < end) | |
1931 | *buf = ':'; | |
1932 | buf++; | |
1933 | } | |
1934 | ||
1935 | switch (*fmt) { | |
1936 | case 'f': /* full_name */ | |
1937 | buf = device_node_gen_full_name(dn, buf, end); | |
1938 | break; | |
1939 | case 'n': /* name */ | |
6d0a70a2 RH |
1940 | p = kbasename(of_node_full_name(dn)); |
1941 | precision = str_spec.precision; | |
1942 | str_spec.precision = strchrnul(p, '@') - p; | |
1943 | buf = string(buf, end, p, str_spec); | |
1944 | str_spec.precision = precision; | |
ce4fecf1 PA |
1945 | break; |
1946 | case 'p': /* phandle */ | |
1947 | buf = number(buf, end, (unsigned int)dn->phandle, num_spec); | |
1948 | break; | |
1949 | case 'P': /* path-spec */ | |
1950 | p = kbasename(of_node_full_name(dn)); | |
1951 | if (!p[1]) | |
1952 | p = "/"; | |
1953 | buf = string(buf, end, p, str_spec); | |
1954 | break; | |
1955 | case 'F': /* flags */ | |
1956 | tbuf[0] = of_node_check_flag(dn, OF_DYNAMIC) ? 'D' : '-'; | |
1957 | tbuf[1] = of_node_check_flag(dn, OF_DETACHED) ? 'd' : '-'; | |
1958 | tbuf[2] = of_node_check_flag(dn, OF_POPULATED) ? 'P' : '-'; | |
1959 | tbuf[3] = of_node_check_flag(dn, OF_POPULATED_BUS) ? 'B' : '-'; | |
1960 | tbuf[4] = 0; | |
d529ac41 | 1961 | buf = string_nocheck(buf, end, tbuf, str_spec); |
ce4fecf1 PA |
1962 | break; |
1963 | case 'c': /* major compatible string */ | |
1964 | ret = of_property_read_string(dn, "compatible", &p); | |
1965 | if (!ret) | |
1966 | buf = string(buf, end, p, str_spec); | |
1967 | break; | |
1968 | case 'C': /* full compatible string */ | |
1969 | has_mult = false; | |
1970 | of_property_for_each_string(dn, "compatible", prop, p) { | |
1971 | if (has_mult) | |
d529ac41 PM |
1972 | buf = string_nocheck(buf, end, ",", str_spec); |
1973 | buf = string_nocheck(buf, end, "\"", str_spec); | |
ce4fecf1 | 1974 | buf = string(buf, end, p, str_spec); |
d529ac41 | 1975 | buf = string_nocheck(buf, end, "\"", str_spec); |
ce4fecf1 PA |
1976 | |
1977 | has_mult = true; | |
1978 | } | |
1979 | break; | |
1980 | default: | |
1981 | break; | |
1982 | } | |
1983 | } | |
1984 | ||
1985 | return widen_string(buf, buf - buf_start, end, spec); | |
1986 | } | |
1987 | ||
798cc27a PM |
1988 | static char *kobject_string(char *buf, char *end, void *ptr, |
1989 | struct printf_spec spec, const char *fmt) | |
1990 | { | |
1991 | switch (fmt[1]) { | |
1992 | case 'F': | |
1993 | return device_node_string(buf, end, ptr, spec, fmt + 1); | |
1994 | } | |
1995 | ||
c8c3b584 | 1996 | return error_string(buf, end, "(%pO?)", spec); |
798cc27a PM |
1997 | } |
1998 | ||
4d8a743c LT |
1999 | /* |
2000 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
2001 | * by an extra set of alphanumeric characters that are extended format | |
2002 | * specifiers. | |
2003 | * | |
0b523769 JP |
2004 | * Please update scripts/checkpatch.pl when adding/removing conversion |
2005 | * characters. (Search for "check for vsprintf extension"). | |
2006 | * | |
332d2e78 LT |
2007 | * Right now we handle: |
2008 | * | |
cdb7e52d SS |
2009 | * - 'S' For symbolic direct pointers (or function descriptors) with offset |
2010 | * - 's' For symbolic direct pointers (or function descriptors) without offset | |
2011 | * - 'F' Same as 'S' | |
2012 | * - 'f' Same as 's' | |
b0d33c2b | 2013 | * - '[FfSs]R' as above with __builtin_extract_return_addr() translation |
0f77a8d3 | 2014 | * - 'B' For backtraced symbolic direct pointers with offset |
c7dabef8 BH |
2015 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] |
2016 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] | |
dbc760bc TH |
2017 | * - 'b[l]' For a bitmap, the number of bits is determined by the field |
2018 | * width which must be explicitly specified either as part of the | |
2019 | * format string '%32b[l]' or through '%*b[l]', [l] selects | |
2020 | * range-list format instead of hex format | |
dd45c9cf HH |
2021 | * - 'M' For a 6-byte MAC address, it prints the address in the |
2022 | * usual colon-separated hex notation | |
8a27f7c9 | 2023 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons |
bc7259a2 | 2024 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address |
c8e00060 | 2025 | * with a dash-separated hex notation |
7c59154e | 2026 | * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth) |
8a27f7c9 JP |
2027 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way |
2028 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
2029 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
10679643 DB |
2030 | * [S][pfs] |
2031 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
2032 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
8a27f7c9 JP |
2033 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses |
2034 | * IPv6 omits the colons (01020304...0f) | |
2035 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
10679643 DB |
2036 | * [S][pfs] |
2037 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
2038 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
2039 | * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order | |
2040 | * - 'I[6S]c' for IPv6 addresses printed as specified by | |
29cf519e | 2041 | * http://tools.ietf.org/html/rfc5952 |
71dca95d AS |
2042 | * - 'E[achnops]' For an escaped buffer, where rules are defined by combination |
2043 | * of the following flags (see string_escape_mem() for the | |
2044 | * details): | |
2045 | * a - ESCAPE_ANY | |
2046 | * c - ESCAPE_SPECIAL | |
2047 | * h - ESCAPE_HEX | |
2048 | * n - ESCAPE_NULL | |
2049 | * o - ESCAPE_OCTAL | |
2050 | * p - ESCAPE_NP | |
2051 | * s - ESCAPE_SPACE | |
2052 | * By default ESCAPE_ANY_NP is used. | |
9ac6e44e JP |
2053 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form |
2054 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" | |
2055 | * Options for %pU are: | |
2056 | * b big endian lower case hex (default) | |
2057 | * B big endian UPPER case hex | |
2058 | * l little endian lower case hex | |
2059 | * L little endian UPPER case hex | |
2060 | * big endian output byte order is: | |
2061 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] | |
2062 | * little endian output byte order is: | |
2063 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] | |
7db6f5fb JP |
2064 | * - 'V' For a struct va_format which contains a format string * and va_list *, |
2065 | * call vsnprintf(->format, *->va_list). | |
2066 | * Implements a "recursive vsnprintf". | |
2067 | * Do not use this feature without some mechanism to verify the | |
2068 | * correctness of the format string and va_list arguments. | |
455cd5ab | 2069 | * - 'K' For a kernel pointer that should be hidden from unprivileged users |
c8f44aff | 2070 | * - 'NF' For a netdev_features_t |
31550a16 AS |
2071 | * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with |
2072 | * a certain separator (' ' by default): | |
2073 | * C colon | |
2074 | * D dash | |
2075 | * N no separator | |
2076 | * The maximum supported length is 64 bytes of the input. Consider | |
2077 | * to use print_hex_dump() for the larger input. | |
aaf07621 JP |
2078 | * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives |
2079 | * (default assumed to be phys_addr_t, passed by reference) | |
c0d92a57 OJ |
2080 | * - 'd[234]' For a dentry name (optionally 2-4 last components) |
2081 | * - 'D[234]' Same as 'd' but for a struct file | |
1031bc58 | 2082 | * - 'g' For block_device name (gendisk + partition number) |
4d42c447 AS |
2083 | * - 't[R][dt][r]' For time and date as represented: |
2084 | * R struct rtc_time | |
900cca29 GU |
2085 | * - 'C' For a clock, it prints the name (Common Clock Framework) or address |
2086 | * (legacy clock framework) of the clock | |
2087 | * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address | |
2088 | * (legacy clock framework) of the clock | |
edf14cdb VB |
2089 | * - 'G' For flags to be printed as a collection of symbolic strings that would |
2090 | * construct the specific value. Supported flags given by option: | |
2091 | * p page flags (see struct page) given as pointer to unsigned long | |
2092 | * g gfp flags (GFP_* and __GFP_*) given as pointer to gfp_t | |
2093 | * v vma flags (VM_*) given as pointer to unsigned long | |
94ac8f20 GU |
2094 | * - 'OF[fnpPcCF]' For a device tree object |
2095 | * Without any optional arguments prints the full_name | |
2096 | * f device node full_name | |
2097 | * n device node name | |
2098 | * p device node phandle | |
2099 | * P device node path spec (name + @unit) | |
2100 | * F device node flags | |
2101 | * c major compatible string | |
2102 | * C full compatible string | |
7b1924a1 TH |
2103 | * - 'x' For printing the address. Equivalent to "%lx". |
2104 | * | |
b3ed2321 TH |
2105 | * ** When making changes please also update: |
2106 | * Documentation/core-api/printk-formats.rst | |
9ac6e44e | 2107 | * |
ad67b74d TH |
2108 | * Note: The default behaviour (unadorned %p) is to hash the address, |
2109 | * rendering it useful as a unique identifier. | |
4d8a743c | 2110 | */ |
cf3b429b JP |
2111 | static noinline_for_stack |
2112 | char *pointer(const char *fmt, char *buf, char *end, void *ptr, | |
2113 | struct printf_spec spec) | |
78a8bf69 | 2114 | { |
0fe1ef24 LT |
2115 | switch (*fmt) { |
2116 | case 'F': | |
0c8b946e | 2117 | case 'f': |
0fe1ef24 | 2118 | case 'S': |
9ac6e44e | 2119 | case 's': |
04b8eb7a SS |
2120 | ptr = dereference_symbol_descriptor(ptr); |
2121 | /* Fallthrough */ | |
0f77a8d3 | 2122 | case 'B': |
b0d33c2b | 2123 | return symbol_string(buf, end, ptr, spec, fmt); |
332d2e78 | 2124 | case 'R': |
c7dabef8 | 2125 | case 'r': |
fd95541e | 2126 | return resource_string(buf, end, ptr, spec, fmt); |
31550a16 AS |
2127 | case 'h': |
2128 | return hex_string(buf, end, ptr, spec, fmt); | |
dbc760bc TH |
2129 | case 'b': |
2130 | switch (fmt[1]) { | |
2131 | case 'l': | |
2132 | return bitmap_list_string(buf, end, ptr, spec, fmt); | |
2133 | default: | |
2134 | return bitmap_string(buf, end, ptr, spec, fmt); | |
2135 | } | |
8a27f7c9 JP |
2136 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
2137 | case 'm': /* Contiguous: 000102030405 */ | |
76597ff9 AE |
2138 | /* [mM]F (FDDI) */ |
2139 | /* [mM]R (Reverse order; Bluetooth) */ | |
8a27f7c9 JP |
2140 | return mac_address_string(buf, end, ptr, spec, fmt); |
2141 | case 'I': /* Formatted IP supported | |
2142 | * 4: 1.2.3.4 | |
2143 | * 6: 0001:0203:...:0708 | |
2144 | * 6c: 1::708 or 1::1.2.3.4 | |
2145 | */ | |
2146 | case 'i': /* Contiguous: | |
2147 | * 4: 001.002.003.004 | |
2148 | * 6: 000102...0f | |
2149 | */ | |
f00cc102 | 2150 | return ip_addr_string(buf, end, ptr, spec, fmt); |
71dca95d AS |
2151 | case 'E': |
2152 | return escaped_string(buf, end, ptr, spec, fmt); | |
9ac6e44e JP |
2153 | case 'U': |
2154 | return uuid_string(buf, end, ptr, spec, fmt); | |
7db6f5fb | 2155 | case 'V': |
3e5903eb | 2156 | return va_format(buf, end, ptr, spec, fmt); |
455cd5ab | 2157 | case 'K': |
57e73442 | 2158 | return restricted_pointer(buf, end, ptr, spec); |
c8f44aff | 2159 | case 'N': |
431bca24 | 2160 | return netdev_bits(buf, end, ptr, spec, fmt); |
7d799210 | 2161 | case 'a': |
3e5903eb | 2162 | return address_val(buf, end, ptr, spec, fmt); |
4b6ccca7 AV |
2163 | case 'd': |
2164 | return dentry_name(buf, end, ptr, spec, fmt); | |
4d42c447 AS |
2165 | case 't': |
2166 | return time_and_date(buf, end, ptr, spec, fmt); | |
900cca29 GU |
2167 | case 'C': |
2168 | return clock(buf, end, ptr, spec, fmt); | |
4b6ccca7 AV |
2169 | case 'D': |
2170 | return dentry_name(buf, end, | |
2171 | ((const struct file *)ptr)->f_path.dentry, | |
2172 | spec, fmt); | |
1031bc58 DM |
2173 | #ifdef CONFIG_BLOCK |
2174 | case 'g': | |
2175 | return bdev_name(buf, end, ptr, spec, fmt); | |
2176 | #endif | |
2177 | ||
edf14cdb | 2178 | case 'G': |
0b74d4d7 | 2179 | return flags_string(buf, end, ptr, spec, fmt); |
ce4fecf1 | 2180 | case 'O': |
798cc27a | 2181 | return kobject_string(buf, end, ptr, spec, fmt); |
7b1924a1 TH |
2182 | case 'x': |
2183 | return pointer_string(buf, end, ptr, spec); | |
fef20d9c | 2184 | } |
fef20d9c | 2185 | |
ad67b74d TH |
2186 | /* default is to _not_ leak addresses, hash before printing */ |
2187 | return ptr_to_id(buf, end, ptr, spec); | |
fef20d9c FW |
2188 | } |
2189 | ||
2190 | /* | |
2191 | * Helper function to decode printf style format. | |
2192 | * Each call decode a token from the format and return the | |
2193 | * number of characters read (or likely the delta where it wants | |
2194 | * to go on the next call). | |
2195 | * The decoded token is returned through the parameters | |
2196 | * | |
2197 | * 'h', 'l', or 'L' for integer fields | |
2198 | * 'z' support added 23/7/1999 S.H. | |
2199 | * 'z' changed to 'Z' --davidm 1/25/99 | |
5b5e0928 | 2200 | * 'Z' changed to 'z' --adobriyan 2017-01-25 |
fef20d9c FW |
2201 | * 't' added for ptrdiff_t |
2202 | * | |
2203 | * @fmt: the format string | |
2204 | * @type of the token returned | |
2205 | * @flags: various flags such as +, -, # tokens.. | |
2206 | * @field_width: overwritten width | |
2207 | * @base: base of the number (octal, hex, ...) | |
2208 | * @precision: precision of a number | |
2209 | * @qualifier: qualifier of a number (long, size_t, ...) | |
2210 | */ | |
cf3b429b JP |
2211 | static noinline_for_stack |
2212 | int format_decode(const char *fmt, struct printf_spec *spec) | |
fef20d9c FW |
2213 | { |
2214 | const char *start = fmt; | |
d0484193 | 2215 | char qualifier; |
fef20d9c FW |
2216 | |
2217 | /* we finished early by reading the field width */ | |
ed681a91 | 2218 | if (spec->type == FORMAT_TYPE_WIDTH) { |
fef20d9c FW |
2219 | if (spec->field_width < 0) { |
2220 | spec->field_width = -spec->field_width; | |
2221 | spec->flags |= LEFT; | |
2222 | } | |
2223 | spec->type = FORMAT_TYPE_NONE; | |
2224 | goto precision; | |
2225 | } | |
2226 | ||
2227 | /* we finished early by reading the precision */ | |
2228 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
2229 | if (spec->precision < 0) | |
2230 | spec->precision = 0; | |
2231 | ||
2232 | spec->type = FORMAT_TYPE_NONE; | |
2233 | goto qualifier; | |
2234 | } | |
2235 | ||
2236 | /* By default */ | |
2237 | spec->type = FORMAT_TYPE_NONE; | |
2238 | ||
2239 | for (; *fmt ; ++fmt) { | |
2240 | if (*fmt == '%') | |
2241 | break; | |
2242 | } | |
2243 | ||
2244 | /* Return the current non-format string */ | |
2245 | if (fmt != start || !*fmt) | |
2246 | return fmt - start; | |
2247 | ||
2248 | /* Process flags */ | |
2249 | spec->flags = 0; | |
2250 | ||
2251 | while (1) { /* this also skips first '%' */ | |
2252 | bool found = true; | |
2253 | ||
2254 | ++fmt; | |
2255 | ||
2256 | switch (*fmt) { | |
2257 | case '-': spec->flags |= LEFT; break; | |
2258 | case '+': spec->flags |= PLUS; break; | |
2259 | case ' ': spec->flags |= SPACE; break; | |
2260 | case '#': spec->flags |= SPECIAL; break; | |
2261 | case '0': spec->flags |= ZEROPAD; break; | |
2262 | default: found = false; | |
2263 | } | |
2264 | ||
2265 | if (!found) | |
2266 | break; | |
2267 | } | |
2268 | ||
2269 | /* get field width */ | |
2270 | spec->field_width = -1; | |
2271 | ||
2272 | if (isdigit(*fmt)) | |
2273 | spec->field_width = skip_atoi(&fmt); | |
2274 | else if (*fmt == '*') { | |
2275 | /* it's the next argument */ | |
ed681a91 | 2276 | spec->type = FORMAT_TYPE_WIDTH; |
fef20d9c FW |
2277 | return ++fmt - start; |
2278 | } | |
2279 | ||
2280 | precision: | |
2281 | /* get the precision */ | |
2282 | spec->precision = -1; | |
2283 | if (*fmt == '.') { | |
2284 | ++fmt; | |
2285 | if (isdigit(*fmt)) { | |
2286 | spec->precision = skip_atoi(&fmt); | |
2287 | if (spec->precision < 0) | |
2288 | spec->precision = 0; | |
2289 | } else if (*fmt == '*') { | |
2290 | /* it's the next argument */ | |
adf26f84 | 2291 | spec->type = FORMAT_TYPE_PRECISION; |
fef20d9c FW |
2292 | return ++fmt - start; |
2293 | } | |
2294 | } | |
2295 | ||
2296 | qualifier: | |
2297 | /* get the conversion qualifier */ | |
d0484193 | 2298 | qualifier = 0; |
75fb8f26 | 2299 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
5b5e0928 | 2300 | *fmt == 'z' || *fmt == 't') { |
d0484193 RV |
2301 | qualifier = *fmt++; |
2302 | if (unlikely(qualifier == *fmt)) { | |
2303 | if (qualifier == 'l') { | |
2304 | qualifier = 'L'; | |
a4e94ef0 | 2305 | ++fmt; |
d0484193 RV |
2306 | } else if (qualifier == 'h') { |
2307 | qualifier = 'H'; | |
a4e94ef0 Z |
2308 | ++fmt; |
2309 | } | |
fef20d9c FW |
2310 | } |
2311 | } | |
2312 | ||
2313 | /* default base */ | |
2314 | spec->base = 10; | |
2315 | switch (*fmt) { | |
2316 | case 'c': | |
2317 | spec->type = FORMAT_TYPE_CHAR; | |
2318 | return ++fmt - start; | |
2319 | ||
2320 | case 's': | |
2321 | spec->type = FORMAT_TYPE_STR; | |
2322 | return ++fmt - start; | |
2323 | ||
2324 | case 'p': | |
2325 | spec->type = FORMAT_TYPE_PTR; | |
ffbfed03 | 2326 | return ++fmt - start; |
fef20d9c | 2327 | |
fef20d9c FW |
2328 | case '%': |
2329 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
2330 | return ++fmt - start; | |
2331 | ||
2332 | /* integer number formats - set up the flags and "break" */ | |
2333 | case 'o': | |
2334 | spec->base = 8; | |
2335 | break; | |
2336 | ||
2337 | case 'x': | |
2338 | spec->flags |= SMALL; | |
7e6bd6f3 | 2339 | /* fall through */ |
fef20d9c FW |
2340 | |
2341 | case 'X': | |
2342 | spec->base = 16; | |
2343 | break; | |
2344 | ||
2345 | case 'd': | |
2346 | case 'i': | |
39e874f8 | 2347 | spec->flags |= SIGN; |
fef20d9c | 2348 | case 'u': |
4aa99606 | 2349 | break; |
fef20d9c | 2350 | |
708d96fd RM |
2351 | case 'n': |
2352 | /* | |
b006f19b RV |
2353 | * Since %n poses a greater security risk than |
2354 | * utility, treat it as any other invalid or | |
2355 | * unsupported format specifier. | |
708d96fd | 2356 | */ |
708d96fd RM |
2357 | /* Fall-through */ |
2358 | ||
fef20d9c | 2359 | default: |
b006f19b | 2360 | WARN_ONCE(1, "Please remove unsupported %%%c in format string\n", *fmt); |
fef20d9c FW |
2361 | spec->type = FORMAT_TYPE_INVALID; |
2362 | return fmt - start; | |
0fe1ef24 | 2363 | } |
fef20d9c | 2364 | |
d0484193 | 2365 | if (qualifier == 'L') |
fef20d9c | 2366 | spec->type = FORMAT_TYPE_LONG_LONG; |
d0484193 | 2367 | else if (qualifier == 'l') { |
51be17df RV |
2368 | BUILD_BUG_ON(FORMAT_TYPE_ULONG + SIGN != FORMAT_TYPE_LONG); |
2369 | spec->type = FORMAT_TYPE_ULONG + (spec->flags & SIGN); | |
5b5e0928 | 2370 | } else if (qualifier == 'z') { |
fef20d9c | 2371 | spec->type = FORMAT_TYPE_SIZE_T; |
d0484193 | 2372 | } else if (qualifier == 't') { |
fef20d9c | 2373 | spec->type = FORMAT_TYPE_PTRDIFF; |
d0484193 | 2374 | } else if (qualifier == 'H') { |
51be17df RV |
2375 | BUILD_BUG_ON(FORMAT_TYPE_UBYTE + SIGN != FORMAT_TYPE_BYTE); |
2376 | spec->type = FORMAT_TYPE_UBYTE + (spec->flags & SIGN); | |
d0484193 | 2377 | } else if (qualifier == 'h') { |
51be17df RV |
2378 | BUILD_BUG_ON(FORMAT_TYPE_USHORT + SIGN != FORMAT_TYPE_SHORT); |
2379 | spec->type = FORMAT_TYPE_USHORT + (spec->flags & SIGN); | |
fef20d9c | 2380 | } else { |
51be17df RV |
2381 | BUILD_BUG_ON(FORMAT_TYPE_UINT + SIGN != FORMAT_TYPE_INT); |
2382 | spec->type = FORMAT_TYPE_UINT + (spec->flags & SIGN); | |
78a8bf69 | 2383 | } |
fef20d9c FW |
2384 | |
2385 | return ++fmt - start; | |
78a8bf69 LT |
2386 | } |
2387 | ||
4d72ba01 RV |
2388 | static void |
2389 | set_field_width(struct printf_spec *spec, int width) | |
2390 | { | |
2391 | spec->field_width = width; | |
2392 | if (WARN_ONCE(spec->field_width != width, "field width %d too large", width)) { | |
2393 | spec->field_width = clamp(width, -FIELD_WIDTH_MAX, FIELD_WIDTH_MAX); | |
2394 | } | |
2395 | } | |
2396 | ||
2397 | static void | |
2398 | set_precision(struct printf_spec *spec, int prec) | |
2399 | { | |
2400 | spec->precision = prec; | |
2401 | if (WARN_ONCE(spec->precision != prec, "precision %d too large", prec)) { | |
2402 | spec->precision = clamp(prec, 0, PRECISION_MAX); | |
2403 | } | |
2404 | } | |
2405 | ||
1da177e4 LT |
2406 | /** |
2407 | * vsnprintf - Format a string and place it in a buffer | |
2408 | * @buf: The buffer to place the result into | |
2409 | * @size: The size of the buffer, including the trailing null space | |
2410 | * @fmt: The format string to use | |
2411 | * @args: Arguments for the format string | |
2412 | * | |
d7ec9a05 RV |
2413 | * This function generally follows C99 vsnprintf, but has some |
2414 | * extensions and a few limitations: | |
2415 | * | |
6cc89134 | 2416 | * - ``%n`` is unsupported |
2417 | * - ``%p*`` is handled by pointer() | |
5e4ee7b1 | 2418 | * |
27e7c0e8 | 2419 | * See pointer() or Documentation/core-api/printk-formats.rst for more |
5e4ee7b1 | 2420 | * extensive description. |
20036fdc | 2421 | * |
6cc89134 | 2422 | * **Please update the documentation in both places when making changes** |
80f548e0 | 2423 | * |
1da177e4 LT |
2424 | * The return value is the number of characters which would |
2425 | * be generated for the given input, excluding the trailing | |
2426 | * '\0', as per ISO C99. If you want to have the exact | |
2427 | * number of characters written into @buf as return value | |
72fd4a35 | 2428 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
2429 | * return is greater than or equal to @size, the resulting |
2430 | * string is truncated. | |
2431 | * | |
ba1835eb | 2432 | * If you're not already dealing with a va_list consider using snprintf(). |
1da177e4 LT |
2433 | */ |
2434 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
2435 | { | |
1da177e4 | 2436 | unsigned long long num; |
d4be151b | 2437 | char *str, *end; |
fef20d9c | 2438 | struct printf_spec spec = {0}; |
1da177e4 | 2439 | |
f796937a JF |
2440 | /* Reject out-of-range values early. Large positive sizes are |
2441 | used for unknown buffer sizes. */ | |
2aa2f9e2 | 2442 | if (WARN_ON_ONCE(size > INT_MAX)) |
1da177e4 | 2443 | return 0; |
1da177e4 LT |
2444 | |
2445 | str = buf; | |
f796937a | 2446 | end = buf + size; |
1da177e4 | 2447 | |
f796937a JF |
2448 | /* Make sure end is always >= buf */ |
2449 | if (end < buf) { | |
2450 | end = ((void *)-1); | |
2451 | size = end - buf; | |
1da177e4 LT |
2452 | } |
2453 | ||
fef20d9c FW |
2454 | while (*fmt) { |
2455 | const char *old_fmt = fmt; | |
d4be151b | 2456 | int read = format_decode(fmt, &spec); |
1da177e4 | 2457 | |
fef20d9c | 2458 | fmt += read; |
1da177e4 | 2459 | |
fef20d9c FW |
2460 | switch (spec.type) { |
2461 | case FORMAT_TYPE_NONE: { | |
2462 | int copy = read; | |
2463 | if (str < end) { | |
2464 | if (copy > end - str) | |
2465 | copy = end - str; | |
2466 | memcpy(str, old_fmt, copy); | |
1da177e4 | 2467 | } |
fef20d9c FW |
2468 | str += read; |
2469 | break; | |
1da177e4 LT |
2470 | } |
2471 | ||
ed681a91 | 2472 | case FORMAT_TYPE_WIDTH: |
4d72ba01 | 2473 | set_field_width(&spec, va_arg(args, int)); |
fef20d9c | 2474 | break; |
1da177e4 | 2475 | |
fef20d9c | 2476 | case FORMAT_TYPE_PRECISION: |
4d72ba01 | 2477 | set_precision(&spec, va_arg(args, int)); |
fef20d9c | 2478 | break; |
1da177e4 | 2479 | |
d4be151b AGR |
2480 | case FORMAT_TYPE_CHAR: { |
2481 | char c; | |
2482 | ||
fef20d9c FW |
2483 | if (!(spec.flags & LEFT)) { |
2484 | while (--spec.field_width > 0) { | |
f796937a | 2485 | if (str < end) |
1da177e4 LT |
2486 | *str = ' '; |
2487 | ++str; | |
1da177e4 | 2488 | |
fef20d9c FW |
2489 | } |
2490 | } | |
2491 | c = (unsigned char) va_arg(args, int); | |
2492 | if (str < end) | |
2493 | *str = c; | |
2494 | ++str; | |
2495 | while (--spec.field_width > 0) { | |
f796937a | 2496 | if (str < end) |
fef20d9c | 2497 | *str = ' '; |
1da177e4 | 2498 | ++str; |
fef20d9c FW |
2499 | } |
2500 | break; | |
d4be151b | 2501 | } |
1da177e4 | 2502 | |
fef20d9c FW |
2503 | case FORMAT_TYPE_STR: |
2504 | str = string(str, end, va_arg(args, char *), spec); | |
2505 | break; | |
1da177e4 | 2506 | |
fef20d9c | 2507 | case FORMAT_TYPE_PTR: |
ffbfed03 | 2508 | str = pointer(fmt, str, end, va_arg(args, void *), |
fef20d9c FW |
2509 | spec); |
2510 | while (isalnum(*fmt)) | |
2511 | fmt++; | |
2512 | break; | |
1da177e4 | 2513 | |
fef20d9c FW |
2514 | case FORMAT_TYPE_PERCENT_CHAR: |
2515 | if (str < end) | |
2516 | *str = '%'; | |
2517 | ++str; | |
2518 | break; | |
1da177e4 | 2519 | |
fef20d9c | 2520 | case FORMAT_TYPE_INVALID: |
b006f19b RV |
2521 | /* |
2522 | * Presumably the arguments passed gcc's type | |
2523 | * checking, but there is no safe or sane way | |
2524 | * for us to continue parsing the format and | |
2525 | * fetching from the va_list; the remaining | |
2526 | * specifiers and arguments would be out of | |
2527 | * sync. | |
2528 | */ | |
2529 | goto out; | |
fef20d9c | 2530 | |
fef20d9c FW |
2531 | default: |
2532 | switch (spec.type) { | |
2533 | case FORMAT_TYPE_LONG_LONG: | |
2534 | num = va_arg(args, long long); | |
2535 | break; | |
2536 | case FORMAT_TYPE_ULONG: | |
2537 | num = va_arg(args, unsigned long); | |
2538 | break; | |
2539 | case FORMAT_TYPE_LONG: | |
2540 | num = va_arg(args, long); | |
2541 | break; | |
2542 | case FORMAT_TYPE_SIZE_T: | |
ef124960 JG |
2543 | if (spec.flags & SIGN) |
2544 | num = va_arg(args, ssize_t); | |
2545 | else | |
2546 | num = va_arg(args, size_t); | |
fef20d9c FW |
2547 | break; |
2548 | case FORMAT_TYPE_PTRDIFF: | |
2549 | num = va_arg(args, ptrdiff_t); | |
2550 | break; | |
a4e94ef0 Z |
2551 | case FORMAT_TYPE_UBYTE: |
2552 | num = (unsigned char) va_arg(args, int); | |
2553 | break; | |
2554 | case FORMAT_TYPE_BYTE: | |
2555 | num = (signed char) va_arg(args, int); | |
2556 | break; | |
fef20d9c FW |
2557 | case FORMAT_TYPE_USHORT: |
2558 | num = (unsigned short) va_arg(args, int); | |
2559 | break; | |
2560 | case FORMAT_TYPE_SHORT: | |
2561 | num = (short) va_arg(args, int); | |
2562 | break; | |
39e874f8 FW |
2563 | case FORMAT_TYPE_INT: |
2564 | num = (int) va_arg(args, int); | |
fef20d9c FW |
2565 | break; |
2566 | default: | |
2567 | num = va_arg(args, unsigned int); | |
2568 | } | |
2569 | ||
2570 | str = number(str, end, num, spec); | |
1da177e4 | 2571 | } |
1da177e4 | 2572 | } |
fef20d9c | 2573 | |
b006f19b | 2574 | out: |
f796937a JF |
2575 | if (size > 0) { |
2576 | if (str < end) | |
2577 | *str = '\0'; | |
2578 | else | |
0a6047ee | 2579 | end[-1] = '\0'; |
f796937a | 2580 | } |
fef20d9c | 2581 | |
f796937a | 2582 | /* the trailing null byte doesn't count towards the total */ |
1da177e4 | 2583 | return str-buf; |
fef20d9c | 2584 | |
1da177e4 | 2585 | } |
1da177e4 LT |
2586 | EXPORT_SYMBOL(vsnprintf); |
2587 | ||
2588 | /** | |
2589 | * vscnprintf - Format a string and place it in a buffer | |
2590 | * @buf: The buffer to place the result into | |
2591 | * @size: The size of the buffer, including the trailing null space | |
2592 | * @fmt: The format string to use | |
2593 | * @args: Arguments for the format string | |
2594 | * | |
2595 | * The return value is the number of characters which have been written into | |
b921c69f | 2596 | * the @buf not including the trailing '\0'. If @size is == 0 the function |
1da177e4 LT |
2597 | * returns 0. |
2598 | * | |
ba1835eb | 2599 | * If you're not already dealing with a va_list consider using scnprintf(). |
20036fdc AK |
2600 | * |
2601 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
2602 | */ |
2603 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
2604 | { | |
2605 | int i; | |
2606 | ||
7b9186f5 AGR |
2607 | i = vsnprintf(buf, size, fmt, args); |
2608 | ||
b921c69f AA |
2609 | if (likely(i < size)) |
2610 | return i; | |
2611 | if (size != 0) | |
2612 | return size - 1; | |
2613 | return 0; | |
1da177e4 | 2614 | } |
1da177e4 LT |
2615 | EXPORT_SYMBOL(vscnprintf); |
2616 | ||
2617 | /** | |
2618 | * snprintf - Format a string and place it in a buffer | |
2619 | * @buf: The buffer to place the result into | |
2620 | * @size: The size of the buffer, including the trailing null space | |
2621 | * @fmt: The format string to use | |
2622 | * @...: Arguments for the format string | |
2623 | * | |
2624 | * The return value is the number of characters which would be | |
2625 | * generated for the given input, excluding the trailing null, | |
2626 | * as per ISO C99. If the return is greater than or equal to | |
2627 | * @size, the resulting string is truncated. | |
20036fdc AK |
2628 | * |
2629 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 2630 | */ |
7b9186f5 | 2631 | int snprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
2632 | { |
2633 | va_list args; | |
2634 | int i; | |
2635 | ||
2636 | va_start(args, fmt); | |
7b9186f5 | 2637 | i = vsnprintf(buf, size, fmt, args); |
1da177e4 | 2638 | va_end(args); |
7b9186f5 | 2639 | |
1da177e4 LT |
2640 | return i; |
2641 | } | |
1da177e4 LT |
2642 | EXPORT_SYMBOL(snprintf); |
2643 | ||
2644 | /** | |
2645 | * scnprintf - Format a string and place it in a buffer | |
2646 | * @buf: The buffer to place the result into | |
2647 | * @size: The size of the buffer, including the trailing null space | |
2648 | * @fmt: The format string to use | |
2649 | * @...: Arguments for the format string | |
2650 | * | |
2651 | * The return value is the number of characters written into @buf not including | |
b903c0b8 | 2652 | * the trailing '\0'. If @size is == 0 the function returns 0. |
1da177e4 LT |
2653 | */ |
2654 | ||
7b9186f5 | 2655 | int scnprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
2656 | { |
2657 | va_list args; | |
2658 | int i; | |
2659 | ||
2660 | va_start(args, fmt); | |
b921c69f | 2661 | i = vscnprintf(buf, size, fmt, args); |
1da177e4 | 2662 | va_end(args); |
7b9186f5 | 2663 | |
b921c69f | 2664 | return i; |
1da177e4 LT |
2665 | } |
2666 | EXPORT_SYMBOL(scnprintf); | |
2667 | ||
2668 | /** | |
2669 | * vsprintf - Format a string and place it in a buffer | |
2670 | * @buf: The buffer to place the result into | |
2671 | * @fmt: The format string to use | |
2672 | * @args: Arguments for the format string | |
2673 | * | |
2674 | * The function returns the number of characters written | |
72fd4a35 | 2675 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
2676 | * buffer overflows. |
2677 | * | |
ba1835eb | 2678 | * If you're not already dealing with a va_list consider using sprintf(). |
20036fdc AK |
2679 | * |
2680 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
2681 | */ |
2682 | int vsprintf(char *buf, const char *fmt, va_list args) | |
2683 | { | |
2684 | return vsnprintf(buf, INT_MAX, fmt, args); | |
2685 | } | |
1da177e4 LT |
2686 | EXPORT_SYMBOL(vsprintf); |
2687 | ||
2688 | /** | |
2689 | * sprintf - Format a string and place it in a buffer | |
2690 | * @buf: The buffer to place the result into | |
2691 | * @fmt: The format string to use | |
2692 | * @...: Arguments for the format string | |
2693 | * | |
2694 | * The function returns the number of characters written | |
72fd4a35 | 2695 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 | 2696 | * buffer overflows. |
20036fdc AK |
2697 | * |
2698 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 2699 | */ |
7b9186f5 | 2700 | int sprintf(char *buf, const char *fmt, ...) |
1da177e4 LT |
2701 | { |
2702 | va_list args; | |
2703 | int i; | |
2704 | ||
2705 | va_start(args, fmt); | |
7b9186f5 | 2706 | i = vsnprintf(buf, INT_MAX, fmt, args); |
1da177e4 | 2707 | va_end(args); |
7b9186f5 | 2708 | |
1da177e4 LT |
2709 | return i; |
2710 | } | |
1da177e4 LT |
2711 | EXPORT_SYMBOL(sprintf); |
2712 | ||
4370aa4a LJ |
2713 | #ifdef CONFIG_BINARY_PRINTF |
2714 | /* | |
2715 | * bprintf service: | |
2716 | * vbin_printf() - VA arguments to binary data | |
2717 | * bstr_printf() - Binary data to text string | |
2718 | */ | |
2719 | ||
2720 | /** | |
2721 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
2722 | * @bin_buf: The buffer to place args' binary value | |
2723 | * @size: The size of the buffer(by words(32bits), not characters) | |
2724 | * @fmt: The format string to use | |
2725 | * @args: Arguments for the format string | |
2726 | * | |
2727 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
da3dae54 | 2728 | * is skipped. |
4370aa4a LJ |
2729 | * |
2730 | * The return value is the number of words(32bits) which would be generated for | |
2731 | * the given input. | |
2732 | * | |
2733 | * NOTE: | |
2734 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
2735 | * valid for bstr_printf(). | |
2736 | */ | |
2737 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
2738 | { | |
fef20d9c | 2739 | struct printf_spec spec = {0}; |
4370aa4a | 2740 | char *str, *end; |
841a915d | 2741 | int width; |
4370aa4a LJ |
2742 | |
2743 | str = (char *)bin_buf; | |
2744 | end = (char *)(bin_buf + size); | |
2745 | ||
2746 | #define save_arg(type) \ | |
841a915d SRV |
2747 | ({ \ |
2748 | unsigned long long value; \ | |
4370aa4a | 2749 | if (sizeof(type) == 8) { \ |
841a915d | 2750 | unsigned long long val8; \ |
4370aa4a | 2751 | str = PTR_ALIGN(str, sizeof(u32)); \ |
841a915d | 2752 | val8 = va_arg(args, unsigned long long); \ |
4370aa4a | 2753 | if (str + sizeof(type) <= end) { \ |
841a915d SRV |
2754 | *(u32 *)str = *(u32 *)&val8; \ |
2755 | *(u32 *)(str + 4) = *((u32 *)&val8 + 1); \ | |
4370aa4a | 2756 | } \ |
841a915d | 2757 | value = val8; \ |
4370aa4a | 2758 | } else { \ |
841a915d | 2759 | unsigned int val4; \ |
4370aa4a | 2760 | str = PTR_ALIGN(str, sizeof(type)); \ |
841a915d | 2761 | val4 = va_arg(args, int); \ |
4370aa4a | 2762 | if (str + sizeof(type) <= end) \ |
841a915d SRV |
2763 | *(typeof(type) *)str = (type)(long)val4; \ |
2764 | value = (unsigned long long)val4; \ | |
4370aa4a LJ |
2765 | } \ |
2766 | str += sizeof(type); \ | |
841a915d SRV |
2767 | value; \ |
2768 | }) | |
4370aa4a | 2769 | |
fef20d9c | 2770 | while (*fmt) { |
d4be151b | 2771 | int read = format_decode(fmt, &spec); |
4370aa4a | 2772 | |
fef20d9c | 2773 | fmt += read; |
4370aa4a | 2774 | |
fef20d9c FW |
2775 | switch (spec.type) { |
2776 | case FORMAT_TYPE_NONE: | |
d4be151b | 2777 | case FORMAT_TYPE_PERCENT_CHAR: |
fef20d9c | 2778 | break; |
b006f19b RV |
2779 | case FORMAT_TYPE_INVALID: |
2780 | goto out; | |
fef20d9c | 2781 | |
ed681a91 | 2782 | case FORMAT_TYPE_WIDTH: |
fef20d9c | 2783 | case FORMAT_TYPE_PRECISION: |
841a915d SRV |
2784 | width = (int)save_arg(int); |
2785 | /* Pointers may require the width */ | |
2786 | if (*fmt == 'p') | |
2787 | set_field_width(&spec, width); | |
fef20d9c FW |
2788 | break; |
2789 | ||
2790 | case FORMAT_TYPE_CHAR: | |
4370aa4a | 2791 | save_arg(char); |
fef20d9c FW |
2792 | break; |
2793 | ||
2794 | case FORMAT_TYPE_STR: { | |
4370aa4a | 2795 | const char *save_str = va_arg(args, char *); |
3e5903eb | 2796 | const char *err_msg; |
4370aa4a | 2797 | size_t len; |
6c356634 | 2798 | |
3e5903eb PM |
2799 | err_msg = check_pointer_msg(save_str); |
2800 | if (err_msg) | |
2801 | save_str = err_msg; | |
2802 | ||
6c356634 AGR |
2803 | len = strlen(save_str) + 1; |
2804 | if (str + len < end) | |
2805 | memcpy(str, save_str, len); | |
2806 | str += len; | |
fef20d9c | 2807 | break; |
4370aa4a | 2808 | } |
fef20d9c FW |
2809 | |
2810 | case FORMAT_TYPE_PTR: | |
841a915d SRV |
2811 | /* Dereferenced pointers must be done now */ |
2812 | switch (*fmt) { | |
2813 | /* Dereference of functions is still OK */ | |
2814 | case 'S': | |
2815 | case 's': | |
2816 | case 'F': | |
2817 | case 'f': | |
1e6338cf SRV |
2818 | case 'x': |
2819 | case 'K': | |
841a915d SRV |
2820 | save_arg(void *); |
2821 | break; | |
2822 | default: | |
2823 | if (!isalnum(*fmt)) { | |
2824 | save_arg(void *); | |
2825 | break; | |
2826 | } | |
2827 | str = pointer(fmt, str, end, va_arg(args, void *), | |
2828 | spec); | |
2829 | if (str + 1 < end) | |
2830 | *str++ = '\0'; | |
2831 | else | |
2832 | end[-1] = '\0'; /* Must be nul terminated */ | |
2833 | } | |
4370aa4a | 2834 | /* skip all alphanumeric pointer suffixes */ |
fef20d9c | 2835 | while (isalnum(*fmt)) |
4370aa4a | 2836 | fmt++; |
fef20d9c FW |
2837 | break; |
2838 | ||
fef20d9c FW |
2839 | default: |
2840 | switch (spec.type) { | |
2841 | ||
2842 | case FORMAT_TYPE_LONG_LONG: | |
4370aa4a | 2843 | save_arg(long long); |
fef20d9c FW |
2844 | break; |
2845 | case FORMAT_TYPE_ULONG: | |
2846 | case FORMAT_TYPE_LONG: | |
4370aa4a | 2847 | save_arg(unsigned long); |
fef20d9c FW |
2848 | break; |
2849 | case FORMAT_TYPE_SIZE_T: | |
4370aa4a | 2850 | save_arg(size_t); |
fef20d9c FW |
2851 | break; |
2852 | case FORMAT_TYPE_PTRDIFF: | |
4370aa4a | 2853 | save_arg(ptrdiff_t); |
fef20d9c | 2854 | break; |
a4e94ef0 Z |
2855 | case FORMAT_TYPE_UBYTE: |
2856 | case FORMAT_TYPE_BYTE: | |
2857 | save_arg(char); | |
2858 | break; | |
fef20d9c FW |
2859 | case FORMAT_TYPE_USHORT: |
2860 | case FORMAT_TYPE_SHORT: | |
4370aa4a | 2861 | save_arg(short); |
fef20d9c FW |
2862 | break; |
2863 | default: | |
4370aa4a | 2864 | save_arg(int); |
fef20d9c | 2865 | } |
4370aa4a LJ |
2866 | } |
2867 | } | |
fef20d9c | 2868 | |
b006f19b | 2869 | out: |
7b9186f5 | 2870 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
fef20d9c | 2871 | #undef save_arg |
4370aa4a LJ |
2872 | } |
2873 | EXPORT_SYMBOL_GPL(vbin_printf); | |
2874 | ||
2875 | /** | |
2876 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
2877 | * @buf: The buffer to place the result into | |
2878 | * @size: The size of the buffer, including the trailing null space | |
2879 | * @fmt: The format string to use | |
2880 | * @bin_buf: Binary arguments for the format string | |
2881 | * | |
2882 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
2883 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
2884 | * a binary buffer that generated by vbin_printf. | |
2885 | * | |
2886 | * The format follows C99 vsnprintf, but has some extensions: | |
0efb4d20 | 2887 | * see vsnprintf comment for details. |
4370aa4a LJ |
2888 | * |
2889 | * The return value is the number of characters which would | |
2890 | * be generated for the given input, excluding the trailing | |
2891 | * '\0', as per ISO C99. If you want to have the exact | |
2892 | * number of characters written into @buf as return value | |
2893 | * (not including the trailing '\0'), use vscnprintf(). If the | |
2894 | * return is greater than or equal to @size, the resulting | |
2895 | * string is truncated. | |
2896 | */ | |
2897 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
2898 | { | |
fef20d9c | 2899 | struct printf_spec spec = {0}; |
d4be151b AGR |
2900 | char *str, *end; |
2901 | const char *args = (const char *)bin_buf; | |
4370aa4a | 2902 | |
762abb51 | 2903 | if (WARN_ON_ONCE(size > INT_MAX)) |
4370aa4a | 2904 | return 0; |
4370aa4a LJ |
2905 | |
2906 | str = buf; | |
2907 | end = buf + size; | |
2908 | ||
2909 | #define get_arg(type) \ | |
2910 | ({ \ | |
2911 | typeof(type) value; \ | |
2912 | if (sizeof(type) == 8) { \ | |
2913 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
2914 | *(u32 *)&value = *(u32 *)args; \ | |
2915 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
2916 | } else { \ | |
2917 | args = PTR_ALIGN(args, sizeof(type)); \ | |
2918 | value = *(typeof(type) *)args; \ | |
2919 | } \ | |
2920 | args += sizeof(type); \ | |
2921 | value; \ | |
2922 | }) | |
2923 | ||
2924 | /* Make sure end is always >= buf */ | |
2925 | if (end < buf) { | |
2926 | end = ((void *)-1); | |
2927 | size = end - buf; | |
2928 | } | |
2929 | ||
fef20d9c | 2930 | while (*fmt) { |
fef20d9c | 2931 | const char *old_fmt = fmt; |
d4be151b | 2932 | int read = format_decode(fmt, &spec); |
4370aa4a | 2933 | |
fef20d9c | 2934 | fmt += read; |
4370aa4a | 2935 | |
fef20d9c FW |
2936 | switch (spec.type) { |
2937 | case FORMAT_TYPE_NONE: { | |
2938 | int copy = read; | |
2939 | if (str < end) { | |
2940 | if (copy > end - str) | |
2941 | copy = end - str; | |
2942 | memcpy(str, old_fmt, copy); | |
4370aa4a | 2943 | } |
fef20d9c FW |
2944 | str += read; |
2945 | break; | |
4370aa4a LJ |
2946 | } |
2947 | ||
ed681a91 | 2948 | case FORMAT_TYPE_WIDTH: |
4d72ba01 | 2949 | set_field_width(&spec, get_arg(int)); |
fef20d9c | 2950 | break; |
4370aa4a | 2951 | |
fef20d9c | 2952 | case FORMAT_TYPE_PRECISION: |
4d72ba01 | 2953 | set_precision(&spec, get_arg(int)); |
fef20d9c | 2954 | break; |
4370aa4a | 2955 | |
d4be151b AGR |
2956 | case FORMAT_TYPE_CHAR: { |
2957 | char c; | |
2958 | ||
fef20d9c FW |
2959 | if (!(spec.flags & LEFT)) { |
2960 | while (--spec.field_width > 0) { | |
4370aa4a LJ |
2961 | if (str < end) |
2962 | *str = ' '; | |
2963 | ++str; | |
2964 | } | |
2965 | } | |
2966 | c = (unsigned char) get_arg(char); | |
2967 | if (str < end) | |
2968 | *str = c; | |
2969 | ++str; | |
fef20d9c | 2970 | while (--spec.field_width > 0) { |
4370aa4a LJ |
2971 | if (str < end) |
2972 | *str = ' '; | |
2973 | ++str; | |
2974 | } | |
fef20d9c | 2975 | break; |
d4be151b | 2976 | } |
4370aa4a | 2977 | |
fef20d9c | 2978 | case FORMAT_TYPE_STR: { |
4370aa4a | 2979 | const char *str_arg = args; |
d4be151b | 2980 | args += strlen(str_arg) + 1; |
fef20d9c FW |
2981 | str = string(str, end, (char *)str_arg, spec); |
2982 | break; | |
4370aa4a LJ |
2983 | } |
2984 | ||
841a915d SRV |
2985 | case FORMAT_TYPE_PTR: { |
2986 | bool process = false; | |
2987 | int copy, len; | |
2988 | /* Non function dereferences were already done */ | |
2989 | switch (*fmt) { | |
2990 | case 'S': | |
2991 | case 's': | |
2992 | case 'F': | |
2993 | case 'f': | |
1e6338cf SRV |
2994 | case 'x': |
2995 | case 'K': | |
841a915d SRV |
2996 | process = true; |
2997 | break; | |
2998 | default: | |
2999 | if (!isalnum(*fmt)) { | |
3000 | process = true; | |
3001 | break; | |
3002 | } | |
3003 | /* Pointer dereference was already processed */ | |
3004 | if (str < end) { | |
3005 | len = copy = strlen(args); | |
3006 | if (copy > end - str) | |
3007 | copy = end - str; | |
3008 | memcpy(str, args, copy); | |
3009 | str += len; | |
62165600 | 3010 | args += len + 1; |
841a915d SRV |
3011 | } |
3012 | } | |
3013 | if (process) | |
3014 | str = pointer(fmt, str, end, get_arg(void *), spec); | |
3015 | ||
fef20d9c | 3016 | while (isalnum(*fmt)) |
4370aa4a | 3017 | fmt++; |
fef20d9c | 3018 | break; |
841a915d | 3019 | } |
4370aa4a | 3020 | |
fef20d9c | 3021 | case FORMAT_TYPE_PERCENT_CHAR: |
4370aa4a LJ |
3022 | if (str < end) |
3023 | *str = '%'; | |
3024 | ++str; | |
fef20d9c FW |
3025 | break; |
3026 | ||
b006f19b RV |
3027 | case FORMAT_TYPE_INVALID: |
3028 | goto out; | |
3029 | ||
d4be151b AGR |
3030 | default: { |
3031 | unsigned long long num; | |
3032 | ||
fef20d9c FW |
3033 | switch (spec.type) { |
3034 | ||
3035 | case FORMAT_TYPE_LONG_LONG: | |
3036 | num = get_arg(long long); | |
3037 | break; | |
3038 | case FORMAT_TYPE_ULONG: | |
fef20d9c FW |
3039 | case FORMAT_TYPE_LONG: |
3040 | num = get_arg(unsigned long); | |
3041 | break; | |
3042 | case FORMAT_TYPE_SIZE_T: | |
3043 | num = get_arg(size_t); | |
3044 | break; | |
3045 | case FORMAT_TYPE_PTRDIFF: | |
3046 | num = get_arg(ptrdiff_t); | |
3047 | break; | |
a4e94ef0 Z |
3048 | case FORMAT_TYPE_UBYTE: |
3049 | num = get_arg(unsigned char); | |
3050 | break; | |
3051 | case FORMAT_TYPE_BYTE: | |
3052 | num = get_arg(signed char); | |
3053 | break; | |
fef20d9c FW |
3054 | case FORMAT_TYPE_USHORT: |
3055 | num = get_arg(unsigned short); | |
3056 | break; | |
3057 | case FORMAT_TYPE_SHORT: | |
3058 | num = get_arg(short); | |
3059 | break; | |
3060 | case FORMAT_TYPE_UINT: | |
3061 | num = get_arg(unsigned int); | |
3062 | break; | |
3063 | default: | |
3064 | num = get_arg(int); | |
3065 | } | |
3066 | ||
3067 | str = number(str, end, num, spec); | |
d4be151b AGR |
3068 | } /* default: */ |
3069 | } /* switch(spec.type) */ | |
3070 | } /* while(*fmt) */ | |
fef20d9c | 3071 | |
b006f19b | 3072 | out: |
4370aa4a LJ |
3073 | if (size > 0) { |
3074 | if (str < end) | |
3075 | *str = '\0'; | |
3076 | else | |
3077 | end[-1] = '\0'; | |
3078 | } | |
fef20d9c | 3079 | |
4370aa4a LJ |
3080 | #undef get_arg |
3081 | ||
3082 | /* the trailing null byte doesn't count towards the total */ | |
3083 | return str - buf; | |
3084 | } | |
3085 | EXPORT_SYMBOL_GPL(bstr_printf); | |
3086 | ||
3087 | /** | |
3088 | * bprintf - Parse a format string and place args' binary value in a buffer | |
3089 | * @bin_buf: The buffer to place args' binary value | |
3090 | * @size: The size of the buffer(by words(32bits), not characters) | |
3091 | * @fmt: The format string to use | |
3092 | * @...: Arguments for the format string | |
3093 | * | |
3094 | * The function returns the number of words(u32) written | |
3095 | * into @bin_buf. | |
3096 | */ | |
3097 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
3098 | { | |
3099 | va_list args; | |
3100 | int ret; | |
3101 | ||
3102 | va_start(args, fmt); | |
3103 | ret = vbin_printf(bin_buf, size, fmt, args); | |
3104 | va_end(args); | |
7b9186f5 | 3105 | |
4370aa4a LJ |
3106 | return ret; |
3107 | } | |
3108 | EXPORT_SYMBOL_GPL(bprintf); | |
3109 | ||
3110 | #endif /* CONFIG_BINARY_PRINTF */ | |
3111 | ||
1da177e4 LT |
3112 | /** |
3113 | * vsscanf - Unformat a buffer into a list of arguments | |
3114 | * @buf: input buffer | |
3115 | * @fmt: format of buffer | |
3116 | * @args: arguments | |
3117 | */ | |
7b9186f5 | 3118 | int vsscanf(const char *buf, const char *fmt, va_list args) |
1da177e4 LT |
3119 | { |
3120 | const char *str = buf; | |
3121 | char *next; | |
3122 | char digit; | |
3123 | int num = 0; | |
ef0658f3 | 3124 | u8 qualifier; |
53809751 JB |
3125 | unsigned int base; |
3126 | union { | |
3127 | long long s; | |
3128 | unsigned long long u; | |
3129 | } val; | |
ef0658f3 | 3130 | s16 field_width; |
d4be151b | 3131 | bool is_sign; |
1da177e4 | 3132 | |
da99075c | 3133 | while (*fmt) { |
1da177e4 LT |
3134 | /* skip any white space in format */ |
3135 | /* white space in format matchs any amount of | |
3136 | * white space, including none, in the input. | |
3137 | */ | |
3138 | if (isspace(*fmt)) { | |
e7d2860b AGR |
3139 | fmt = skip_spaces(++fmt); |
3140 | str = skip_spaces(str); | |
1da177e4 LT |
3141 | } |
3142 | ||
3143 | /* anything that is not a conversion must match exactly */ | |
3144 | if (*fmt != '%' && *fmt) { | |
3145 | if (*fmt++ != *str++) | |
3146 | break; | |
3147 | continue; | |
3148 | } | |
3149 | ||
3150 | if (!*fmt) | |
3151 | break; | |
3152 | ++fmt; | |
7b9186f5 | 3153 | |
1da177e4 LT |
3154 | /* skip this conversion. |
3155 | * advance both strings to next white space | |
3156 | */ | |
3157 | if (*fmt == '*') { | |
da99075c JB |
3158 | if (!*str) |
3159 | break; | |
f9310b2f JY |
3160 | while (!isspace(*fmt) && *fmt != '%' && *fmt) { |
3161 | /* '%*[' not yet supported, invalid format */ | |
3162 | if (*fmt == '[') | |
3163 | return num; | |
1da177e4 | 3164 | fmt++; |
f9310b2f | 3165 | } |
1da177e4 LT |
3166 | while (!isspace(*str) && *str) |
3167 | str++; | |
3168 | continue; | |
3169 | } | |
3170 | ||
3171 | /* get field width */ | |
3172 | field_width = -1; | |
53809751 | 3173 | if (isdigit(*fmt)) { |
1da177e4 | 3174 | field_width = skip_atoi(&fmt); |
53809751 JB |
3175 | if (field_width <= 0) |
3176 | break; | |
3177 | } | |
1da177e4 LT |
3178 | |
3179 | /* get conversion qualifier */ | |
3180 | qualifier = -1; | |
75fb8f26 | 3181 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
5b5e0928 | 3182 | *fmt == 'z') { |
1da177e4 LT |
3183 | qualifier = *fmt++; |
3184 | if (unlikely(qualifier == *fmt)) { | |
3185 | if (qualifier == 'h') { | |
3186 | qualifier = 'H'; | |
3187 | fmt++; | |
3188 | } else if (qualifier == 'l') { | |
3189 | qualifier = 'L'; | |
3190 | fmt++; | |
3191 | } | |
3192 | } | |
3193 | } | |
1da177e4 | 3194 | |
da99075c JB |
3195 | if (!*fmt) |
3196 | break; | |
3197 | ||
3198 | if (*fmt == 'n') { | |
3199 | /* return number of characters read so far */ | |
3200 | *va_arg(args, int *) = str - buf; | |
3201 | ++fmt; | |
3202 | continue; | |
3203 | } | |
3204 | ||
3205 | if (!*str) | |
1da177e4 LT |
3206 | break; |
3207 | ||
d4be151b | 3208 | base = 10; |
3f623eba | 3209 | is_sign = false; |
d4be151b | 3210 | |
7b9186f5 | 3211 | switch (*fmt++) { |
1da177e4 LT |
3212 | case 'c': |
3213 | { | |
7b9186f5 | 3214 | char *s = (char *)va_arg(args, char*); |
1da177e4 LT |
3215 | if (field_width == -1) |
3216 | field_width = 1; | |
3217 | do { | |
3218 | *s++ = *str++; | |
3219 | } while (--field_width > 0 && *str); | |
3220 | num++; | |
3221 | } | |
3222 | continue; | |
3223 | case 's': | |
3224 | { | |
7b9186f5 AGR |
3225 | char *s = (char *)va_arg(args, char *); |
3226 | if (field_width == -1) | |
4be929be | 3227 | field_width = SHRT_MAX; |
1da177e4 | 3228 | /* first, skip leading white space in buffer */ |
e7d2860b | 3229 | str = skip_spaces(str); |
1da177e4 LT |
3230 | |
3231 | /* now copy until next white space */ | |
7b9186f5 | 3232 | while (*str && !isspace(*str) && field_width--) |
1da177e4 | 3233 | *s++ = *str++; |
1da177e4 LT |
3234 | *s = '\0'; |
3235 | num++; | |
3236 | } | |
3237 | continue; | |
f9310b2f JY |
3238 | /* |
3239 | * Warning: This implementation of the '[' conversion specifier | |
3240 | * deviates from its glibc counterpart in the following ways: | |
3241 | * (1) It does NOT support ranges i.e. '-' is NOT a special | |
3242 | * character | |
3243 | * (2) It cannot match the closing bracket ']' itself | |
3244 | * (3) A field width is required | |
3245 | * (4) '%*[' (discard matching input) is currently not supported | |
3246 | * | |
3247 | * Example usage: | |
3248 | * ret = sscanf("00:0a:95","%2[^:]:%2[^:]:%2[^:]", | |
3249 | * buf1, buf2, buf3); | |
3250 | * if (ret < 3) | |
3251 | * // etc.. | |
3252 | */ | |
3253 | case '[': | |
3254 | { | |
3255 | char *s = (char *)va_arg(args, char *); | |
3256 | DECLARE_BITMAP(set, 256) = {0}; | |
3257 | unsigned int len = 0; | |
3258 | bool negate = (*fmt == '^'); | |
3259 | ||
3260 | /* field width is required */ | |
3261 | if (field_width == -1) | |
3262 | return num; | |
3263 | ||
3264 | if (negate) | |
3265 | ++fmt; | |
3266 | ||
3267 | for ( ; *fmt && *fmt != ']'; ++fmt, ++len) | |
3268 | set_bit((u8)*fmt, set); | |
3269 | ||
3270 | /* no ']' or no character set found */ | |
3271 | if (!*fmt || !len) | |
3272 | return num; | |
3273 | ++fmt; | |
3274 | ||
3275 | if (negate) { | |
3276 | bitmap_complement(set, set, 256); | |
3277 | /* exclude null '\0' byte */ | |
3278 | clear_bit(0, set); | |
3279 | } | |
3280 | ||
3281 | /* match must be non-empty */ | |
3282 | if (!test_bit((u8)*str, set)) | |
3283 | return num; | |
3284 | ||
3285 | while (test_bit((u8)*str, set) && field_width--) | |
3286 | *s++ = *str++; | |
3287 | *s = '\0'; | |
3288 | ++num; | |
3289 | } | |
3290 | continue; | |
1da177e4 LT |
3291 | case 'o': |
3292 | base = 8; | |
3293 | break; | |
3294 | case 'x': | |
3295 | case 'X': | |
3296 | base = 16; | |
3297 | break; | |
3298 | case 'i': | |
7b9186f5 | 3299 | base = 0; |
7e6bd6f3 | 3300 | /* fall through */ |
1da177e4 | 3301 | case 'd': |
3f623eba | 3302 | is_sign = true; |
7e6bd6f3 | 3303 | /* fall through */ |
1da177e4 LT |
3304 | case 'u': |
3305 | break; | |
3306 | case '%': | |
3307 | /* looking for '%' in str */ | |
7b9186f5 | 3308 | if (*str++ != '%') |
1da177e4 LT |
3309 | return num; |
3310 | continue; | |
3311 | default: | |
3312 | /* invalid format; stop here */ | |
3313 | return num; | |
3314 | } | |
3315 | ||
3316 | /* have some sort of integer conversion. | |
3317 | * first, skip white space in buffer. | |
3318 | */ | |
e7d2860b | 3319 | str = skip_spaces(str); |
1da177e4 LT |
3320 | |
3321 | digit = *str; | |
3322 | if (is_sign && digit == '-') | |
3323 | digit = *(str + 1); | |
3324 | ||
3325 | if (!digit | |
7b9186f5 AGR |
3326 | || (base == 16 && !isxdigit(digit)) |
3327 | || (base == 10 && !isdigit(digit)) | |
3328 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
3329 | || (base == 0 && !isdigit(digit))) | |
3330 | break; | |
1da177e4 | 3331 | |
53809751 JB |
3332 | if (is_sign) |
3333 | val.s = qualifier != 'L' ? | |
3334 | simple_strtol(str, &next, base) : | |
3335 | simple_strtoll(str, &next, base); | |
3336 | else | |
3337 | val.u = qualifier != 'L' ? | |
3338 | simple_strtoul(str, &next, base) : | |
3339 | simple_strtoull(str, &next, base); | |
3340 | ||
3341 | if (field_width > 0 && next - str > field_width) { | |
3342 | if (base == 0) | |
3343 | _parse_integer_fixup_radix(str, &base); | |
3344 | while (next - str > field_width) { | |
3345 | if (is_sign) | |
3346 | val.s = div_s64(val.s, base); | |
3347 | else | |
3348 | val.u = div_u64(val.u, base); | |
3349 | --next; | |
3350 | } | |
3351 | } | |
3352 | ||
7b9186f5 | 3353 | switch (qualifier) { |
1da177e4 | 3354 | case 'H': /* that's 'hh' in format */ |
53809751 JB |
3355 | if (is_sign) |
3356 | *va_arg(args, signed char *) = val.s; | |
3357 | else | |
3358 | *va_arg(args, unsigned char *) = val.u; | |
1da177e4 LT |
3359 | break; |
3360 | case 'h': | |
53809751 JB |
3361 | if (is_sign) |
3362 | *va_arg(args, short *) = val.s; | |
3363 | else | |
3364 | *va_arg(args, unsigned short *) = val.u; | |
1da177e4 LT |
3365 | break; |
3366 | case 'l': | |
53809751 JB |
3367 | if (is_sign) |
3368 | *va_arg(args, long *) = val.s; | |
3369 | else | |
3370 | *va_arg(args, unsigned long *) = val.u; | |
1da177e4 LT |
3371 | break; |
3372 | case 'L': | |
53809751 JB |
3373 | if (is_sign) |
3374 | *va_arg(args, long long *) = val.s; | |
3375 | else | |
3376 | *va_arg(args, unsigned long long *) = val.u; | |
1da177e4 | 3377 | break; |
1da177e4 | 3378 | case 'z': |
53809751 JB |
3379 | *va_arg(args, size_t *) = val.u; |
3380 | break; | |
1da177e4 | 3381 | default: |
53809751 JB |
3382 | if (is_sign) |
3383 | *va_arg(args, int *) = val.s; | |
3384 | else | |
3385 | *va_arg(args, unsigned int *) = val.u; | |
1da177e4 LT |
3386 | break; |
3387 | } | |
3388 | num++; | |
3389 | ||
3390 | if (!next) | |
3391 | break; | |
3392 | str = next; | |
3393 | } | |
c6b40d16 | 3394 | |
1da177e4 LT |
3395 | return num; |
3396 | } | |
1da177e4 LT |
3397 | EXPORT_SYMBOL(vsscanf); |
3398 | ||
3399 | /** | |
3400 | * sscanf - Unformat a buffer into a list of arguments | |
3401 | * @buf: input buffer | |
3402 | * @fmt: formatting of buffer | |
3403 | * @...: resulting arguments | |
3404 | */ | |
7b9186f5 | 3405 | int sscanf(const char *buf, const char *fmt, ...) |
1da177e4 LT |
3406 | { |
3407 | va_list args; | |
3408 | int i; | |
3409 | ||
7b9186f5 AGR |
3410 | va_start(args, fmt); |
3411 | i = vsscanf(buf, fmt, args); | |
1da177e4 | 3412 | va_end(args); |
7b9186f5 | 3413 | |
1da177e4 LT |
3414 | return i; |
3415 | } | |
1da177e4 | 3416 | EXPORT_SYMBOL(sscanf); |