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> | |
0d1d7a55 | 20 | #include <linux/clk.h> |
900cca29 | 21 | #include <linux/clk-provider.h> |
8bc3bcc9 | 22 | #include <linux/module.h> /* for KSYM_SYMBOL_LEN */ |
1da177e4 LT |
23 | #include <linux/types.h> |
24 | #include <linux/string.h> | |
25 | #include <linux/ctype.h> | |
26 | #include <linux/kernel.h> | |
0fe1ef24 | 27 | #include <linux/kallsyms.h> |
53809751 | 28 | #include <linux/math64.h> |
0fe1ef24 | 29 | #include <linux/uaccess.h> |
332d2e78 | 30 | #include <linux/ioport.h> |
4b6ccca7 | 31 | #include <linux/dcache.h> |
312b4e22 | 32 | #include <linux/cred.h> |
2b1b0d66 | 33 | #include <linux/uuid.h> |
ce4fecf1 | 34 | #include <linux/of.h> |
8a27f7c9 | 35 | #include <net/addrconf.h> |
1031bc58 DM |
36 | #ifdef CONFIG_BLOCK |
37 | #include <linux/blkdev.h> | |
38 | #endif | |
1da177e4 | 39 | |
edf14cdb VB |
40 | #include "../mm/internal.h" /* For the trace_print_flags arrays */ |
41 | ||
4e57b681 | 42 | #include <asm/page.h> /* for PAGE_SIZE */ |
deac93df | 43 | #include <asm/sections.h> /* for dereference_function_descriptor() */ |
7c43d9a3 | 44 | #include <asm/byteorder.h> /* cpu_to_le16 */ |
1da177e4 | 45 | |
71dca95d | 46 | #include <linux/string_helpers.h> |
1dff46d6 | 47 | #include "kstrtox.h" |
aa46a63e | 48 | |
1da177e4 | 49 | /** |
922ac25c | 50 | * simple_strtoull - convert a string to an unsigned long long |
1da177e4 LT |
51 | * @cp: The start of the string |
52 | * @endp: A pointer to the end of the parsed string will be placed here | |
53 | * @base: The number base to use | |
462e4711 EZ |
54 | * |
55 | * This function is obsolete. Please use kstrtoull instead. | |
1da177e4 | 56 | */ |
922ac25c | 57 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
1da177e4 | 58 | { |
1dff46d6 AD |
59 | unsigned long long result; |
60 | unsigned int rv; | |
aa46a63e | 61 | |
1dff46d6 AD |
62 | cp = _parse_integer_fixup_radix(cp, &base); |
63 | rv = _parse_integer(cp, base, &result); | |
64 | /* FIXME */ | |
65 | cp += (rv & ~KSTRTOX_OVERFLOW); | |
aa46a63e | 66 | |
1da177e4 LT |
67 | if (endp) |
68 | *endp = (char *)cp; | |
7b9186f5 | 69 | |
1da177e4 LT |
70 | return result; |
71 | } | |
922ac25c | 72 | EXPORT_SYMBOL(simple_strtoull); |
1da177e4 LT |
73 | |
74 | /** | |
922ac25c | 75 | * simple_strtoul - convert a string to an unsigned long |
1da177e4 LT |
76 | * @cp: The start of the string |
77 | * @endp: A pointer to the end of the parsed string will be placed here | |
78 | * @base: The number base to use | |
462e4711 EZ |
79 | * |
80 | * This function is obsolete. Please use kstrtoul instead. | |
1da177e4 | 81 | */ |
922ac25c | 82 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
1da177e4 | 83 | { |
922ac25c | 84 | return simple_strtoull(cp, endp, base); |
1da177e4 | 85 | } |
922ac25c | 86 | EXPORT_SYMBOL(simple_strtoul); |
1da177e4 LT |
87 | |
88 | /** | |
922ac25c | 89 | * simple_strtol - convert a string to a signed long |
1da177e4 LT |
90 | * @cp: The start of the string |
91 | * @endp: A pointer to the end of the parsed string will be placed here | |
92 | * @base: The number base to use | |
462e4711 EZ |
93 | * |
94 | * This function is obsolete. Please use kstrtol instead. | |
1da177e4 | 95 | */ |
922ac25c | 96 | long simple_strtol(const char *cp, char **endp, unsigned int base) |
1da177e4 | 97 | { |
922ac25c AGR |
98 | if (*cp == '-') |
99 | return -simple_strtoul(cp + 1, endp, base); | |
7b9186f5 | 100 | |
922ac25c | 101 | return simple_strtoul(cp, endp, base); |
1da177e4 | 102 | } |
922ac25c | 103 | EXPORT_SYMBOL(simple_strtol); |
1da177e4 LT |
104 | |
105 | /** | |
106 | * simple_strtoll - convert a string to a signed long long | |
107 | * @cp: The start of the string | |
108 | * @endp: A pointer to the end of the parsed string will be placed here | |
109 | * @base: The number base to use | |
462e4711 EZ |
110 | * |
111 | * This function is obsolete. Please use kstrtoll instead. | |
1da177e4 | 112 | */ |
22d27051 | 113 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
1da177e4 | 114 | { |
7b9186f5 | 115 | if (*cp == '-') |
22d27051 | 116 | return -simple_strtoull(cp + 1, endp, base); |
7b9186f5 | 117 | |
22d27051 | 118 | return simple_strtoull(cp, endp, base); |
1da177e4 | 119 | } |
98d5ce0d | 120 | EXPORT_SYMBOL(simple_strtoll); |
1da177e4 | 121 | |
cf3b429b JP |
122 | static noinline_for_stack |
123 | int skip_atoi(const char **s) | |
1da177e4 | 124 | { |
7b9186f5 | 125 | int i = 0; |
1da177e4 | 126 | |
43e5b666 | 127 | do { |
1da177e4 | 128 | i = i*10 + *((*s)++) - '0'; |
43e5b666 | 129 | } while (isdigit(**s)); |
7b9186f5 | 130 | |
1da177e4 LT |
131 | return i; |
132 | } | |
133 | ||
7c43d9a3 RV |
134 | /* |
135 | * Decimal conversion is by far the most typical, and is used for | |
136 | * /proc and /sys data. This directly impacts e.g. top performance | |
137 | * with many processes running. We optimize it for speed by emitting | |
138 | * two characters at a time, using a 200 byte lookup table. This | |
139 | * roughly halves the number of multiplications compared to computing | |
140 | * the digits one at a time. Implementation strongly inspired by the | |
141 | * previous version, which in turn used ideas described at | |
142 | * <http://www.cs.uiowa.edu/~jones/bcd/divide.html> (with permission | |
143 | * from the author, Douglas W. Jones). | |
144 | * | |
145 | * It turns out there is precisely one 26 bit fixed-point | |
146 | * approximation a of 64/100 for which x/100 == (x * (u64)a) >> 32 | |
147 | * holds for all x in [0, 10^8-1], namely a = 0x28f5c29. The actual | |
148 | * range happens to be somewhat larger (x <= 1073741898), but that's | |
149 | * irrelevant for our purpose. | |
150 | * | |
151 | * For dividing a number in the range [10^4, 10^6-1] by 100, we still | |
152 | * need a 32x32->64 bit multiply, so we simply use the same constant. | |
153 | * | |
154 | * For dividing a number in the range [100, 10^4-1] by 100, there are | |
155 | * several options. The simplest is (x * 0x147b) >> 19, which is valid | |
156 | * for all x <= 43698. | |
133fd9f5 | 157 | */ |
4277eedd | 158 | |
7c43d9a3 RV |
159 | static const u16 decpair[100] = { |
160 | #define _(x) (__force u16) cpu_to_le16(((x % 10) | ((x / 10) << 8)) + 0x3030) | |
161 | _( 0), _( 1), _( 2), _( 3), _( 4), _( 5), _( 6), _( 7), _( 8), _( 9), | |
162 | _(10), _(11), _(12), _(13), _(14), _(15), _(16), _(17), _(18), _(19), | |
163 | _(20), _(21), _(22), _(23), _(24), _(25), _(26), _(27), _(28), _(29), | |
164 | _(30), _(31), _(32), _(33), _(34), _(35), _(36), _(37), _(38), _(39), | |
165 | _(40), _(41), _(42), _(43), _(44), _(45), _(46), _(47), _(48), _(49), | |
166 | _(50), _(51), _(52), _(53), _(54), _(55), _(56), _(57), _(58), _(59), | |
167 | _(60), _(61), _(62), _(63), _(64), _(65), _(66), _(67), _(68), _(69), | |
168 | _(70), _(71), _(72), _(73), _(74), _(75), _(76), _(77), _(78), _(79), | |
169 | _(80), _(81), _(82), _(83), _(84), _(85), _(86), _(87), _(88), _(89), | |
170 | _(90), _(91), _(92), _(93), _(94), _(95), _(96), _(97), _(98), _(99), | |
171 | #undef _ | |
172 | }; | |
173 | ||
174 | /* | |
175 | * This will print a single '0' even if r == 0, since we would | |
675cf53c RV |
176 | * immediately jump to out_r where two 0s would be written but only |
177 | * one of them accounted for in buf. This is needed by ip4_string | |
178 | * below. All other callers pass a non-zero value of r. | |
7c43d9a3 | 179 | */ |
cf3b429b | 180 | static noinline_for_stack |
7c43d9a3 | 181 | char *put_dec_trunc8(char *buf, unsigned r) |
4277eedd | 182 | { |
7c43d9a3 RV |
183 | unsigned q; |
184 | ||
185 | /* 1 <= r < 10^8 */ | |
186 | if (r < 100) | |
187 | goto out_r; | |
188 | ||
189 | /* 100 <= r < 10^8 */ | |
190 | q = (r * (u64)0x28f5c29) >> 32; | |
191 | *((u16 *)buf) = decpair[r - 100*q]; | |
192 | buf += 2; | |
193 | ||
194 | /* 1 <= q < 10^6 */ | |
195 | if (q < 100) | |
196 | goto out_q; | |
197 | ||
198 | /* 100 <= q < 10^6 */ | |
199 | r = (q * (u64)0x28f5c29) >> 32; | |
200 | *((u16 *)buf) = decpair[q - 100*r]; | |
201 | buf += 2; | |
202 | ||
203 | /* 1 <= r < 10^4 */ | |
204 | if (r < 100) | |
205 | goto out_r; | |
206 | ||
207 | /* 100 <= r < 10^4 */ | |
208 | q = (r * 0x147b) >> 19; | |
209 | *((u16 *)buf) = decpair[r - 100*q]; | |
210 | buf += 2; | |
211 | out_q: | |
212 | /* 1 <= q < 100 */ | |
213 | r = q; | |
214 | out_r: | |
215 | /* 1 <= r < 100 */ | |
216 | *((u16 *)buf) = decpair[r]; | |
675cf53c | 217 | buf += r < 10 ? 1 : 2; |
4277eedd DV |
218 | return buf; |
219 | } | |
133fd9f5 | 220 | |
7c43d9a3 | 221 | #if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG == 64 |
cf3b429b | 222 | static noinline_for_stack |
7c43d9a3 | 223 | char *put_dec_full8(char *buf, unsigned r) |
4277eedd | 224 | { |
133fd9f5 DV |
225 | unsigned q; |
226 | ||
7c43d9a3 RV |
227 | /* 0 <= r < 10^8 */ |
228 | q = (r * (u64)0x28f5c29) >> 32; | |
229 | *((u16 *)buf) = decpair[r - 100*q]; | |
230 | buf += 2; | |
4277eedd | 231 | |
7c43d9a3 RV |
232 | /* 0 <= q < 10^6 */ |
233 | r = (q * (u64)0x28f5c29) >> 32; | |
234 | *((u16 *)buf) = decpair[q - 100*r]; | |
235 | buf += 2; | |
7b9186f5 | 236 | |
7c43d9a3 RV |
237 | /* 0 <= r < 10^4 */ |
238 | q = (r * 0x147b) >> 19; | |
239 | *((u16 *)buf) = decpair[r - 100*q]; | |
240 | buf += 2; | |
133fd9f5 | 241 | |
7c43d9a3 RV |
242 | /* 0 <= q < 100 */ |
243 | *((u16 *)buf) = decpair[q]; | |
244 | buf += 2; | |
245 | return buf; | |
246 | } | |
133fd9f5 | 247 | |
7c43d9a3 | 248 | static noinline_for_stack |
133fd9f5 DV |
249 | char *put_dec(char *buf, unsigned long long n) |
250 | { | |
7c43d9a3 RV |
251 | if (n >= 100*1000*1000) |
252 | buf = put_dec_full8(buf, do_div(n, 100*1000*1000)); | |
253 | /* 1 <= n <= 1.6e11 */ | |
254 | if (n >= 100*1000*1000) | |
255 | buf = put_dec_full8(buf, do_div(n, 100*1000*1000)); | |
256 | /* 1 <= n < 1e8 */ | |
133fd9f5 | 257 | return put_dec_trunc8(buf, n); |
4277eedd | 258 | } |
133fd9f5 | 259 | |
7c43d9a3 | 260 | #elif BITS_PER_LONG == 32 && BITS_PER_LONG_LONG == 64 |
133fd9f5 | 261 | |
7c43d9a3 RV |
262 | static void |
263 | put_dec_full4(char *buf, unsigned r) | |
4277eedd | 264 | { |
7c43d9a3 RV |
265 | unsigned q; |
266 | ||
267 | /* 0 <= r < 10^4 */ | |
268 | q = (r * 0x147b) >> 19; | |
269 | *((u16 *)buf) = decpair[r - 100*q]; | |
270 | buf += 2; | |
271 | /* 0 <= q < 100 */ | |
272 | *((u16 *)buf) = decpair[q]; | |
2359172a GS |
273 | } |
274 | ||
275 | /* | |
276 | * Call put_dec_full4 on x % 10000, return x / 10000. | |
277 | * The approximation x/10000 == (x * 0x346DC5D7) >> 43 | |
278 | * holds for all x < 1,128,869,999. The largest value this | |
279 | * helper will ever be asked to convert is 1,125,520,955. | |
7c43d9a3 | 280 | * (second call in the put_dec code, assuming n is all-ones). |
2359172a | 281 | */ |
7c43d9a3 | 282 | static noinline_for_stack |
2359172a GS |
283 | unsigned put_dec_helper4(char *buf, unsigned x) |
284 | { | |
285 | uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43; | |
286 | ||
287 | put_dec_full4(buf, x - q * 10000); | |
288 | return q; | |
4277eedd DV |
289 | } |
290 | ||
133fd9f5 DV |
291 | /* Based on code by Douglas W. Jones found at |
292 | * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour> | |
293 | * (with permission from the author). | |
294 | * Performs no 64-bit division and hence should be fast on 32-bit machines. | |
295 | */ | |
296 | static | |
297 | char *put_dec(char *buf, unsigned long long n) | |
298 | { | |
299 | uint32_t d3, d2, d1, q, h; | |
300 | ||
301 | if (n < 100*1000*1000) | |
302 | return put_dec_trunc8(buf, n); | |
303 | ||
304 | d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */ | |
305 | h = (n >> 32); | |
306 | d2 = (h ) & 0xffff; | |
307 | d3 = (h >> 16); /* implicit "& 0xffff" */ | |
308 | ||
7c43d9a3 RV |
309 | /* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0 |
310 | = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */ | |
133fd9f5 | 311 | q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff); |
2359172a GS |
312 | q = put_dec_helper4(buf, q); |
313 | ||
314 | q += 7671 * d3 + 9496 * d2 + 6 * d1; | |
315 | q = put_dec_helper4(buf+4, q); | |
316 | ||
317 | q += 4749 * d3 + 42 * d2; | |
318 | q = put_dec_helper4(buf+8, q); | |
133fd9f5 | 319 | |
2359172a GS |
320 | q += 281 * d3; |
321 | buf += 12; | |
322 | if (q) | |
323 | buf = put_dec_trunc8(buf, q); | |
324 | else while (buf[-1] == '0') | |
133fd9f5 DV |
325 | --buf; |
326 | ||
327 | return buf; | |
328 | } | |
329 | ||
330 | #endif | |
331 | ||
1ac101a5 KH |
332 | /* |
333 | * Convert passed number to decimal string. | |
334 | * Returns the length of string. On buffer overflow, returns 0. | |
335 | * | |
336 | * If speed is not important, use snprintf(). It's easy to read the code. | |
337 | */ | |
338 | int num_to_str(char *buf, int size, unsigned long long num) | |
339 | { | |
7c43d9a3 RV |
340 | /* put_dec requires 2-byte alignment of the buffer. */ |
341 | char tmp[sizeof(num) * 3] __aligned(2); | |
1ac101a5 KH |
342 | int idx, len; |
343 | ||
133fd9f5 DV |
344 | /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */ |
345 | if (num <= 9) { | |
346 | tmp[0] = '0' + num; | |
347 | len = 1; | |
348 | } else { | |
349 | len = put_dec(tmp, num) - tmp; | |
350 | } | |
1ac101a5 KH |
351 | |
352 | if (len > size) | |
353 | return 0; | |
354 | for (idx = 0; idx < len; ++idx) | |
355 | buf[idx] = tmp[len - idx - 1]; | |
133fd9f5 | 356 | return len; |
1ac101a5 KH |
357 | } |
358 | ||
51be17df | 359 | #define SIGN 1 /* unsigned/signed, must be 1 */ |
d1c1b121 | 360 | #define LEFT 2 /* left justified */ |
1da177e4 LT |
361 | #define PLUS 4 /* show plus */ |
362 | #define SPACE 8 /* space if plus */ | |
d1c1b121 | 363 | #define ZEROPAD 16 /* pad with zero, must be 16 == '0' - ' ' */ |
b89dc5d6 BH |
364 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ |
365 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ | |
1da177e4 | 366 | |
fef20d9c FW |
367 | enum format_type { |
368 | FORMAT_TYPE_NONE, /* Just a string part */ | |
ed681a91 | 369 | FORMAT_TYPE_WIDTH, |
fef20d9c FW |
370 | FORMAT_TYPE_PRECISION, |
371 | FORMAT_TYPE_CHAR, | |
372 | FORMAT_TYPE_STR, | |
373 | FORMAT_TYPE_PTR, | |
374 | FORMAT_TYPE_PERCENT_CHAR, | |
375 | FORMAT_TYPE_INVALID, | |
376 | FORMAT_TYPE_LONG_LONG, | |
377 | FORMAT_TYPE_ULONG, | |
378 | FORMAT_TYPE_LONG, | |
a4e94ef0 Z |
379 | FORMAT_TYPE_UBYTE, |
380 | FORMAT_TYPE_BYTE, | |
fef20d9c FW |
381 | FORMAT_TYPE_USHORT, |
382 | FORMAT_TYPE_SHORT, | |
383 | FORMAT_TYPE_UINT, | |
384 | FORMAT_TYPE_INT, | |
fef20d9c FW |
385 | FORMAT_TYPE_SIZE_T, |
386 | FORMAT_TYPE_PTRDIFF | |
387 | }; | |
388 | ||
389 | struct printf_spec { | |
d0484193 RV |
390 | unsigned int type:8; /* format_type enum */ |
391 | signed int field_width:24; /* width of output field */ | |
392 | unsigned int flags:8; /* flags to number() */ | |
393 | unsigned int base:8; /* number base, 8, 10 or 16 only */ | |
394 | signed int precision:16; /* # of digits/chars */ | |
395 | } __packed; | |
4d72ba01 RV |
396 | #define FIELD_WIDTH_MAX ((1 << 23) - 1) |
397 | #define PRECISION_MAX ((1 << 15) - 1) | |
fef20d9c | 398 | |
cf3b429b JP |
399 | static noinline_for_stack |
400 | char *number(char *buf, char *end, unsigned long long num, | |
401 | struct printf_spec spec) | |
1da177e4 | 402 | { |
7c43d9a3 RV |
403 | /* put_dec requires 2-byte alignment of the buffer. */ |
404 | char tmp[3 * sizeof(num)] __aligned(2); | |
9b706aee DV |
405 | char sign; |
406 | char locase; | |
fef20d9c | 407 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
1da177e4 | 408 | int i; |
7c203422 | 409 | bool is_zero = num == 0LL; |
1c7a8e62 RV |
410 | int field_width = spec.field_width; |
411 | int precision = spec.precision; | |
1da177e4 | 412 | |
d0484193 RV |
413 | BUILD_BUG_ON(sizeof(struct printf_spec) != 8); |
414 | ||
9b706aee DV |
415 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
416 | * produces same digits or (maybe lowercased) letters */ | |
fef20d9c FW |
417 | locase = (spec.flags & SMALL); |
418 | if (spec.flags & LEFT) | |
419 | spec.flags &= ~ZEROPAD; | |
1da177e4 | 420 | sign = 0; |
fef20d9c | 421 | if (spec.flags & SIGN) { |
7b9186f5 | 422 | if ((signed long long)num < 0) { |
1da177e4 | 423 | sign = '-'; |
7b9186f5 | 424 | num = -(signed long long)num; |
1c7a8e62 | 425 | field_width--; |
fef20d9c | 426 | } else if (spec.flags & PLUS) { |
1da177e4 | 427 | sign = '+'; |
1c7a8e62 | 428 | field_width--; |
fef20d9c | 429 | } else if (spec.flags & SPACE) { |
1da177e4 | 430 | sign = ' '; |
1c7a8e62 | 431 | field_width--; |
1da177e4 LT |
432 | } |
433 | } | |
b39a7340 | 434 | if (need_pfx) { |
fef20d9c | 435 | if (spec.base == 16) |
1c7a8e62 | 436 | field_width -= 2; |
7c203422 | 437 | else if (!is_zero) |
1c7a8e62 | 438 | field_width--; |
1da177e4 | 439 | } |
b39a7340 DV |
440 | |
441 | /* generate full string in tmp[], in reverse order */ | |
1da177e4 | 442 | i = 0; |
133fd9f5 | 443 | if (num < spec.base) |
3ea8d440 | 444 | tmp[i++] = hex_asc_upper[num] | locase; |
fef20d9c FW |
445 | else if (spec.base != 10) { /* 8 or 16 */ |
446 | int mask = spec.base - 1; | |
b39a7340 | 447 | int shift = 3; |
7b9186f5 AGR |
448 | |
449 | if (spec.base == 16) | |
450 | shift = 4; | |
b39a7340 | 451 | do { |
3ea8d440 | 452 | tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase); |
b39a7340 DV |
453 | num >>= shift; |
454 | } while (num); | |
4277eedd DV |
455 | } else { /* base 10 */ |
456 | i = put_dec(tmp, num) - tmp; | |
457 | } | |
b39a7340 DV |
458 | |
459 | /* printing 100 using %2d gives "100", not "00" */ | |
1c7a8e62 RV |
460 | if (i > precision) |
461 | precision = i; | |
b39a7340 | 462 | /* leading space padding */ |
1c7a8e62 | 463 | field_width -= precision; |
51be17df | 464 | if (!(spec.flags & (ZEROPAD | LEFT))) { |
1c7a8e62 | 465 | while (--field_width >= 0) { |
f796937a | 466 | if (buf < end) |
1da177e4 LT |
467 | *buf = ' '; |
468 | ++buf; | |
469 | } | |
470 | } | |
b39a7340 | 471 | /* sign */ |
1da177e4 | 472 | if (sign) { |
f796937a | 473 | if (buf < end) |
1da177e4 LT |
474 | *buf = sign; |
475 | ++buf; | |
476 | } | |
b39a7340 DV |
477 | /* "0x" / "0" prefix */ |
478 | if (need_pfx) { | |
7c203422 PC |
479 | if (spec.base == 16 || !is_zero) { |
480 | if (buf < end) | |
481 | *buf = '0'; | |
482 | ++buf; | |
483 | } | |
fef20d9c | 484 | if (spec.base == 16) { |
f796937a | 485 | if (buf < end) |
9b706aee | 486 | *buf = ('X' | locase); |
1da177e4 LT |
487 | ++buf; |
488 | } | |
489 | } | |
b39a7340 | 490 | /* zero or space padding */ |
fef20d9c | 491 | if (!(spec.flags & LEFT)) { |
d1c1b121 RV |
492 | char c = ' ' + (spec.flags & ZEROPAD); |
493 | BUILD_BUG_ON(' ' + ZEROPAD != '0'); | |
1c7a8e62 | 494 | while (--field_width >= 0) { |
f796937a | 495 | if (buf < end) |
1da177e4 LT |
496 | *buf = c; |
497 | ++buf; | |
498 | } | |
499 | } | |
b39a7340 | 500 | /* hmm even more zero padding? */ |
1c7a8e62 | 501 | while (i <= --precision) { |
f796937a | 502 | if (buf < end) |
1da177e4 LT |
503 | *buf = '0'; |
504 | ++buf; | |
505 | } | |
b39a7340 DV |
506 | /* actual digits of result */ |
507 | while (--i >= 0) { | |
f796937a | 508 | if (buf < end) |
1da177e4 LT |
509 | *buf = tmp[i]; |
510 | ++buf; | |
511 | } | |
b39a7340 | 512 | /* trailing space padding */ |
1c7a8e62 | 513 | while (--field_width >= 0) { |
f796937a | 514 | if (buf < end) |
1da177e4 LT |
515 | *buf = ' '; |
516 | ++buf; | |
517 | } | |
7b9186f5 | 518 | |
1da177e4 LT |
519 | return buf; |
520 | } | |
521 | ||
3cab1e71 AS |
522 | static noinline_for_stack |
523 | char *special_hex_number(char *buf, char *end, unsigned long long num, int size) | |
524 | { | |
525 | struct printf_spec spec; | |
526 | ||
527 | spec.type = FORMAT_TYPE_PTR; | |
528 | spec.field_width = 2 + 2 * size; /* 0x + hex */ | |
529 | spec.flags = SPECIAL | SMALL | ZEROPAD; | |
530 | spec.base = 16; | |
531 | spec.precision = -1; | |
532 | ||
533 | return number(buf, end, num, spec); | |
534 | } | |
535 | ||
cfccde04 | 536 | static void move_right(char *buf, char *end, unsigned len, unsigned spaces) |
4b6ccca7 AV |
537 | { |
538 | size_t size; | |
539 | if (buf >= end) /* nowhere to put anything */ | |
540 | return; | |
541 | size = end - buf; | |
542 | if (size <= spaces) { | |
543 | memset(buf, ' ', size); | |
544 | return; | |
545 | } | |
546 | if (len) { | |
547 | if (len > size - spaces) | |
548 | len = size - spaces; | |
549 | memmove(buf + spaces, buf, len); | |
550 | } | |
551 | memset(buf, ' ', spaces); | |
552 | } | |
553 | ||
cfccde04 RV |
554 | /* |
555 | * Handle field width padding for a string. | |
556 | * @buf: current buffer position | |
557 | * @n: length of string | |
558 | * @end: end of output buffer | |
559 | * @spec: for field width and flags | |
560 | * Returns: new buffer position after padding. | |
561 | */ | |
562 | static noinline_for_stack | |
563 | char *widen_string(char *buf, int n, char *end, struct printf_spec spec) | |
564 | { | |
565 | unsigned spaces; | |
566 | ||
567 | if (likely(n >= spec.field_width)) | |
568 | return buf; | |
569 | /* we want to pad the sucker */ | |
570 | spaces = spec.field_width - n; | |
571 | if (!(spec.flags & LEFT)) { | |
572 | move_right(buf - n, end, n, spaces); | |
573 | return buf + spaces; | |
574 | } | |
575 | while (spaces--) { | |
576 | if (buf < end) | |
577 | *buf = ' '; | |
578 | ++buf; | |
579 | } | |
580 | return buf; | |
581 | } | |
582 | ||
95508cfa RV |
583 | static noinline_for_stack |
584 | char *string(char *buf, char *end, const char *s, struct printf_spec spec) | |
585 | { | |
34fc8b90 RV |
586 | int len = 0; |
587 | size_t lim = spec.precision; | |
95508cfa RV |
588 | |
589 | if ((unsigned long)s < PAGE_SIZE) | |
590 | s = "(null)"; | |
591 | ||
34fc8b90 RV |
592 | while (lim--) { |
593 | char c = *s++; | |
594 | if (!c) | |
595 | break; | |
95508cfa | 596 | if (buf < end) |
34fc8b90 | 597 | *buf = c; |
95508cfa | 598 | ++buf; |
34fc8b90 | 599 | ++len; |
95508cfa | 600 | } |
34fc8b90 | 601 | return widen_string(buf, len, end, spec); |
95508cfa RV |
602 | } |
603 | ||
4b6ccca7 AV |
604 | static noinline_for_stack |
605 | char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec, | |
606 | const char *fmt) | |
607 | { | |
608 | const char *array[4], *s; | |
609 | const struct dentry *p; | |
610 | int depth; | |
611 | int i, n; | |
612 | ||
613 | switch (fmt[1]) { | |
614 | case '2': case '3': case '4': | |
615 | depth = fmt[1] - '0'; | |
616 | break; | |
617 | default: | |
618 | depth = 1; | |
619 | } | |
620 | ||
621 | rcu_read_lock(); | |
622 | for (i = 0; i < depth; i++, d = p) { | |
6aa7de05 MR |
623 | p = READ_ONCE(d->d_parent); |
624 | array[i] = READ_ONCE(d->d_name.name); | |
4b6ccca7 AV |
625 | if (p == d) { |
626 | if (i) | |
627 | array[i] = ""; | |
628 | i++; | |
629 | break; | |
630 | } | |
631 | } | |
632 | s = array[--i]; | |
633 | for (n = 0; n != spec.precision; n++, buf++) { | |
634 | char c = *s++; | |
635 | if (!c) { | |
636 | if (!i) | |
637 | break; | |
638 | c = '/'; | |
639 | s = array[--i]; | |
640 | } | |
641 | if (buf < end) | |
642 | *buf = c; | |
643 | } | |
644 | rcu_read_unlock(); | |
cfccde04 | 645 | return widen_string(buf, n, end, spec); |
4b6ccca7 AV |
646 | } |
647 | ||
1031bc58 DM |
648 | #ifdef CONFIG_BLOCK |
649 | static noinline_for_stack | |
650 | char *bdev_name(char *buf, char *end, struct block_device *bdev, | |
651 | struct printf_spec spec, const char *fmt) | |
652 | { | |
653 | struct gendisk *hd = bdev->bd_disk; | |
654 | ||
655 | buf = string(buf, end, hd->disk_name, spec); | |
656 | if (bdev->bd_part->partno) { | |
657 | if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) { | |
658 | if (buf < end) | |
659 | *buf = 'p'; | |
660 | buf++; | |
661 | } | |
662 | buf = number(buf, end, bdev->bd_part->partno, spec); | |
663 | } | |
664 | return buf; | |
665 | } | |
666 | #endif | |
667 | ||
cf3b429b JP |
668 | static noinline_for_stack |
669 | char *symbol_string(char *buf, char *end, void *ptr, | |
b0d33c2b | 670 | struct printf_spec spec, const char *fmt) |
0fe1ef24 | 671 | { |
b0d33c2b | 672 | unsigned long value; |
0fe1ef24 LT |
673 | #ifdef CONFIG_KALLSYMS |
674 | char sym[KSYM_SYMBOL_LEN]; | |
b0d33c2b JP |
675 | #endif |
676 | ||
677 | if (fmt[1] == 'R') | |
678 | ptr = __builtin_extract_return_addr(ptr); | |
679 | value = (unsigned long)ptr; | |
680 | ||
681 | #ifdef CONFIG_KALLSYMS | |
682 | if (*fmt == 'B') | |
0f77a8d3 | 683 | sprint_backtrace(sym, value); |
b0d33c2b | 684 | else if (*fmt != 'f' && *fmt != 's') |
0c8b946e FW |
685 | sprint_symbol(sym, value); |
686 | else | |
4796dd20 | 687 | sprint_symbol_no_offset(sym, value); |
7b9186f5 | 688 | |
fef20d9c | 689 | return string(buf, end, sym, spec); |
0fe1ef24 | 690 | #else |
3cab1e71 | 691 | return special_hex_number(buf, end, value, sizeof(void *)); |
0fe1ef24 LT |
692 | #endif |
693 | } | |
694 | ||
cf3b429b JP |
695 | static noinline_for_stack |
696 | char *resource_string(char *buf, char *end, struct resource *res, | |
697 | struct printf_spec spec, const char *fmt) | |
332d2e78 LT |
698 | { |
699 | #ifndef IO_RSRC_PRINTK_SIZE | |
28405372 | 700 | #define IO_RSRC_PRINTK_SIZE 6 |
332d2e78 LT |
701 | #endif |
702 | ||
703 | #ifndef MEM_RSRC_PRINTK_SIZE | |
28405372 | 704 | #define MEM_RSRC_PRINTK_SIZE 10 |
332d2e78 | 705 | #endif |
4da0b66c | 706 | static const struct printf_spec io_spec = { |
fef20d9c | 707 | .base = 16, |
4da0b66c | 708 | .field_width = IO_RSRC_PRINTK_SIZE, |
fef20d9c FW |
709 | .precision = -1, |
710 | .flags = SPECIAL | SMALL | ZEROPAD, | |
711 | }; | |
4da0b66c BH |
712 | static const struct printf_spec mem_spec = { |
713 | .base = 16, | |
714 | .field_width = MEM_RSRC_PRINTK_SIZE, | |
715 | .precision = -1, | |
716 | .flags = SPECIAL | SMALL | ZEROPAD, | |
717 | }; | |
0f4050c7 BH |
718 | static const struct printf_spec bus_spec = { |
719 | .base = 16, | |
720 | .field_width = 2, | |
721 | .precision = -1, | |
722 | .flags = SMALL | ZEROPAD, | |
723 | }; | |
4da0b66c | 724 | static const struct printf_spec dec_spec = { |
c91d3376 BH |
725 | .base = 10, |
726 | .precision = -1, | |
727 | .flags = 0, | |
728 | }; | |
4da0b66c | 729 | static const struct printf_spec str_spec = { |
fd95541e BH |
730 | .field_width = -1, |
731 | .precision = 10, | |
732 | .flags = LEFT, | |
733 | }; | |
4da0b66c | 734 | static const struct printf_spec flag_spec = { |
fd95541e BH |
735 | .base = 16, |
736 | .precision = -1, | |
737 | .flags = SPECIAL | SMALL, | |
738 | }; | |
c7dabef8 BH |
739 | |
740 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) | |
741 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ | |
742 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) | |
743 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) | |
9d7cca04 | 744 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") |
c7dabef8 BH |
745 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") |
746 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, | |
747 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; | |
748 | ||
332d2e78 | 749 | char *p = sym, *pend = sym + sizeof(sym); |
c7dabef8 | 750 | int decode = (fmt[0] == 'R') ? 1 : 0; |
4da0b66c | 751 | const struct printf_spec *specp; |
332d2e78 LT |
752 | |
753 | *p++ = '['; | |
4da0b66c | 754 | if (res->flags & IORESOURCE_IO) { |
c7dabef8 | 755 | p = string(p, pend, "io ", str_spec); |
4da0b66c BH |
756 | specp = &io_spec; |
757 | } else if (res->flags & IORESOURCE_MEM) { | |
c7dabef8 | 758 | p = string(p, pend, "mem ", str_spec); |
4da0b66c BH |
759 | specp = &mem_spec; |
760 | } else if (res->flags & IORESOURCE_IRQ) { | |
c7dabef8 | 761 | p = string(p, pend, "irq ", str_spec); |
4da0b66c BH |
762 | specp = &dec_spec; |
763 | } else if (res->flags & IORESOURCE_DMA) { | |
c7dabef8 | 764 | p = string(p, pend, "dma ", str_spec); |
4da0b66c | 765 | specp = &dec_spec; |
0f4050c7 BH |
766 | } else if (res->flags & IORESOURCE_BUS) { |
767 | p = string(p, pend, "bus ", str_spec); | |
768 | specp = &bus_spec; | |
4da0b66c | 769 | } else { |
c7dabef8 | 770 | p = string(p, pend, "??? ", str_spec); |
4da0b66c | 771 | specp = &mem_spec; |
c7dabef8 | 772 | decode = 0; |
fd95541e | 773 | } |
d19cb803 BH |
774 | if (decode && res->flags & IORESOURCE_UNSET) { |
775 | p = string(p, pend, "size ", str_spec); | |
776 | p = number(p, pend, resource_size(res), *specp); | |
777 | } else { | |
778 | p = number(p, pend, res->start, *specp); | |
779 | if (res->start != res->end) { | |
780 | *p++ = '-'; | |
781 | p = number(p, pend, res->end, *specp); | |
782 | } | |
c91d3376 | 783 | } |
c7dabef8 | 784 | if (decode) { |
fd95541e BH |
785 | if (res->flags & IORESOURCE_MEM_64) |
786 | p = string(p, pend, " 64bit", str_spec); | |
787 | if (res->flags & IORESOURCE_PREFETCH) | |
788 | p = string(p, pend, " pref", str_spec); | |
9d7cca04 BH |
789 | if (res->flags & IORESOURCE_WINDOW) |
790 | p = string(p, pend, " window", str_spec); | |
fd95541e BH |
791 | if (res->flags & IORESOURCE_DISABLED) |
792 | p = string(p, pend, " disabled", str_spec); | |
c7dabef8 BH |
793 | } else { |
794 | p = string(p, pend, " flags ", str_spec); | |
795 | p = number(p, pend, res->flags, flag_spec); | |
fd95541e | 796 | } |
332d2e78 | 797 | *p++ = ']'; |
c7dabef8 | 798 | *p = '\0'; |
332d2e78 | 799 | |
fef20d9c | 800 | return string(buf, end, sym, spec); |
332d2e78 LT |
801 | } |
802 | ||
31550a16 AS |
803 | static noinline_for_stack |
804 | char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
805 | const char *fmt) | |
806 | { | |
360603a1 | 807 | int i, len = 1; /* if we pass '%ph[CDN]', field width remains |
31550a16 AS |
808 | negative value, fallback to the default */ |
809 | char separator; | |
810 | ||
811 | if (spec.field_width == 0) | |
812 | /* nothing to print */ | |
813 | return buf; | |
814 | ||
815 | if (ZERO_OR_NULL_PTR(addr)) | |
816 | /* NULL pointer */ | |
817 | return string(buf, end, NULL, spec); | |
818 | ||
819 | switch (fmt[1]) { | |
820 | case 'C': | |
821 | separator = ':'; | |
822 | break; | |
823 | case 'D': | |
824 | separator = '-'; | |
825 | break; | |
826 | case 'N': | |
827 | separator = 0; | |
828 | break; | |
829 | default: | |
830 | separator = ' '; | |
831 | break; | |
832 | } | |
833 | ||
834 | if (spec.field_width > 0) | |
835 | len = min_t(int, spec.field_width, 64); | |
836 | ||
9c98f235 RV |
837 | for (i = 0; i < len; ++i) { |
838 | if (buf < end) | |
839 | *buf = hex_asc_hi(addr[i]); | |
840 | ++buf; | |
841 | if (buf < end) | |
842 | *buf = hex_asc_lo(addr[i]); | |
843 | ++buf; | |
31550a16 | 844 | |
9c98f235 RV |
845 | if (separator && i != len - 1) { |
846 | if (buf < end) | |
847 | *buf = separator; | |
848 | ++buf; | |
849 | } | |
31550a16 AS |
850 | } |
851 | ||
852 | return buf; | |
853 | } | |
854 | ||
dbc760bc TH |
855 | static noinline_for_stack |
856 | char *bitmap_string(char *buf, char *end, unsigned long *bitmap, | |
857 | struct printf_spec spec, const char *fmt) | |
858 | { | |
859 | const int CHUNKSZ = 32; | |
860 | int nr_bits = max_t(int, spec.field_width, 0); | |
861 | int i, chunksz; | |
862 | bool first = true; | |
863 | ||
864 | /* reused to print numbers */ | |
865 | spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 }; | |
866 | ||
867 | chunksz = nr_bits & (CHUNKSZ - 1); | |
868 | if (chunksz == 0) | |
869 | chunksz = CHUNKSZ; | |
870 | ||
871 | i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ; | |
872 | for (; i >= 0; i -= CHUNKSZ) { | |
873 | u32 chunkmask, val; | |
874 | int word, bit; | |
875 | ||
876 | chunkmask = ((1ULL << chunksz) - 1); | |
877 | word = i / BITS_PER_LONG; | |
878 | bit = i % BITS_PER_LONG; | |
879 | val = (bitmap[word] >> bit) & chunkmask; | |
880 | ||
881 | if (!first) { | |
882 | if (buf < end) | |
883 | *buf = ','; | |
884 | buf++; | |
885 | } | |
886 | first = false; | |
887 | ||
888 | spec.field_width = DIV_ROUND_UP(chunksz, 4); | |
889 | buf = number(buf, end, val, spec); | |
890 | ||
891 | chunksz = CHUNKSZ; | |
892 | } | |
893 | return buf; | |
894 | } | |
895 | ||
896 | static noinline_for_stack | |
897 | char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap, | |
898 | struct printf_spec spec, const char *fmt) | |
899 | { | |
900 | int nr_bits = max_t(int, spec.field_width, 0); | |
901 | /* current bit is 'cur', most recently seen range is [rbot, rtop] */ | |
902 | int cur, rbot, rtop; | |
903 | bool first = true; | |
904 | ||
905 | /* reused to print numbers */ | |
906 | spec = (struct printf_spec){ .base = 10 }; | |
907 | ||
908 | rbot = cur = find_first_bit(bitmap, nr_bits); | |
909 | while (cur < nr_bits) { | |
910 | rtop = cur; | |
911 | cur = find_next_bit(bitmap, nr_bits, cur + 1); | |
912 | if (cur < nr_bits && cur <= rtop + 1) | |
913 | continue; | |
914 | ||
915 | if (!first) { | |
916 | if (buf < end) | |
917 | *buf = ','; | |
918 | buf++; | |
919 | } | |
920 | first = false; | |
921 | ||
922 | buf = number(buf, end, rbot, spec); | |
923 | if (rbot < rtop) { | |
924 | if (buf < end) | |
925 | *buf = '-'; | |
926 | buf++; | |
927 | ||
928 | buf = number(buf, end, rtop, spec); | |
929 | } | |
930 | ||
931 | rbot = cur; | |
932 | } | |
933 | return buf; | |
934 | } | |
935 | ||
cf3b429b JP |
936 | static noinline_for_stack |
937 | char *mac_address_string(char *buf, char *end, u8 *addr, | |
938 | struct printf_spec spec, const char *fmt) | |
dd45c9cf | 939 | { |
8a27f7c9 | 940 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; |
dd45c9cf HH |
941 | char *p = mac_addr; |
942 | int i; | |
bc7259a2 | 943 | char separator; |
76597ff9 | 944 | bool reversed = false; |
bc7259a2 | 945 | |
76597ff9 AE |
946 | switch (fmt[1]) { |
947 | case 'F': | |
bc7259a2 | 948 | separator = '-'; |
76597ff9 AE |
949 | break; |
950 | ||
951 | case 'R': | |
952 | reversed = true; | |
953 | /* fall through */ | |
954 | ||
955 | default: | |
bc7259a2 | 956 | separator = ':'; |
76597ff9 | 957 | break; |
bc7259a2 | 958 | } |
dd45c9cf HH |
959 | |
960 | for (i = 0; i < 6; i++) { | |
76597ff9 AE |
961 | if (reversed) |
962 | p = hex_byte_pack(p, addr[5 - i]); | |
963 | else | |
964 | p = hex_byte_pack(p, addr[i]); | |
965 | ||
8a27f7c9 | 966 | if (fmt[0] == 'M' && i != 5) |
bc7259a2 | 967 | *p++ = separator; |
dd45c9cf HH |
968 | } |
969 | *p = '\0'; | |
970 | ||
fef20d9c | 971 | return string(buf, end, mac_addr, spec); |
dd45c9cf HH |
972 | } |
973 | ||
cf3b429b JP |
974 | static noinline_for_stack |
975 | char *ip4_string(char *p, const u8 *addr, const char *fmt) | |
8a27f7c9 JP |
976 | { |
977 | int i; | |
0159f24e JP |
978 | bool leading_zeros = (fmt[0] == 'i'); |
979 | int index; | |
980 | int step; | |
981 | ||
982 | switch (fmt[2]) { | |
983 | case 'h': | |
984 | #ifdef __BIG_ENDIAN | |
985 | index = 0; | |
986 | step = 1; | |
987 | #else | |
988 | index = 3; | |
989 | step = -1; | |
990 | #endif | |
991 | break; | |
992 | case 'l': | |
993 | index = 3; | |
994 | step = -1; | |
995 | break; | |
996 | case 'n': | |
997 | case 'b': | |
998 | default: | |
999 | index = 0; | |
1000 | step = 1; | |
1001 | break; | |
1002 | } | |
8a27f7c9 | 1003 | for (i = 0; i < 4; i++) { |
7c43d9a3 | 1004 | char temp[4] __aligned(2); /* hold each IP quad in reverse order */ |
133fd9f5 | 1005 | int digits = put_dec_trunc8(temp, addr[index]) - temp; |
8a27f7c9 JP |
1006 | if (leading_zeros) { |
1007 | if (digits < 3) | |
1008 | *p++ = '0'; | |
1009 | if (digits < 2) | |
1010 | *p++ = '0'; | |
1011 | } | |
1012 | /* reverse the digits in the quad */ | |
1013 | while (digits--) | |
1014 | *p++ = temp[digits]; | |
1015 | if (i < 3) | |
1016 | *p++ = '.'; | |
0159f24e | 1017 | index += step; |
8a27f7c9 | 1018 | } |
8a27f7c9 | 1019 | *p = '\0'; |
7b9186f5 | 1020 | |
8a27f7c9 JP |
1021 | return p; |
1022 | } | |
1023 | ||
cf3b429b JP |
1024 | static noinline_for_stack |
1025 | char *ip6_compressed_string(char *p, const char *addr) | |
689afa7d | 1026 | { |
7b9186f5 | 1027 | int i, j, range; |
8a27f7c9 JP |
1028 | unsigned char zerolength[8]; |
1029 | int longest = 1; | |
1030 | int colonpos = -1; | |
1031 | u16 word; | |
7b9186f5 | 1032 | u8 hi, lo; |
8a27f7c9 | 1033 | bool needcolon = false; |
eb78cd26 JP |
1034 | bool useIPv4; |
1035 | struct in6_addr in6; | |
1036 | ||
1037 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
1038 | ||
1039 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
8a27f7c9 JP |
1040 | |
1041 | memset(zerolength, 0, sizeof(zerolength)); | |
1042 | ||
1043 | if (useIPv4) | |
1044 | range = 6; | |
1045 | else | |
1046 | range = 8; | |
1047 | ||
1048 | /* find position of longest 0 run */ | |
1049 | for (i = 0; i < range; i++) { | |
1050 | for (j = i; j < range; j++) { | |
eb78cd26 | 1051 | if (in6.s6_addr16[j] != 0) |
8a27f7c9 JP |
1052 | break; |
1053 | zerolength[i]++; | |
1054 | } | |
1055 | } | |
1056 | for (i = 0; i < range; i++) { | |
1057 | if (zerolength[i] > longest) { | |
1058 | longest = zerolength[i]; | |
1059 | colonpos = i; | |
1060 | } | |
1061 | } | |
29cf519e JP |
1062 | if (longest == 1) /* don't compress a single 0 */ |
1063 | colonpos = -1; | |
689afa7d | 1064 | |
8a27f7c9 JP |
1065 | /* emit address */ |
1066 | for (i = 0; i < range; i++) { | |
1067 | if (i == colonpos) { | |
1068 | if (needcolon || i == 0) | |
1069 | *p++ = ':'; | |
1070 | *p++ = ':'; | |
1071 | needcolon = false; | |
1072 | i += longest - 1; | |
1073 | continue; | |
1074 | } | |
1075 | if (needcolon) { | |
1076 | *p++ = ':'; | |
1077 | needcolon = false; | |
1078 | } | |
1079 | /* hex u16 without leading 0s */ | |
eb78cd26 | 1080 | word = ntohs(in6.s6_addr16[i]); |
8a27f7c9 JP |
1081 | hi = word >> 8; |
1082 | lo = word & 0xff; | |
1083 | if (hi) { | |
1084 | if (hi > 0x0f) | |
55036ba7 | 1085 | p = hex_byte_pack(p, hi); |
8a27f7c9 JP |
1086 | else |
1087 | *p++ = hex_asc_lo(hi); | |
55036ba7 | 1088 | p = hex_byte_pack(p, lo); |
8a27f7c9 | 1089 | } |
b5ff992b | 1090 | else if (lo > 0x0f) |
55036ba7 | 1091 | p = hex_byte_pack(p, lo); |
8a27f7c9 JP |
1092 | else |
1093 | *p++ = hex_asc_lo(lo); | |
1094 | needcolon = true; | |
1095 | } | |
1096 | ||
1097 | if (useIPv4) { | |
1098 | if (needcolon) | |
1099 | *p++ = ':'; | |
0159f24e | 1100 | p = ip4_string(p, &in6.s6_addr[12], "I4"); |
8a27f7c9 | 1101 | } |
8a27f7c9 | 1102 | *p = '\0'; |
7b9186f5 | 1103 | |
8a27f7c9 JP |
1104 | return p; |
1105 | } | |
1106 | ||
cf3b429b JP |
1107 | static noinline_for_stack |
1108 | char *ip6_string(char *p, const char *addr, const char *fmt) | |
8a27f7c9 JP |
1109 | { |
1110 | int i; | |
7b9186f5 | 1111 | |
689afa7d | 1112 | for (i = 0; i < 8; i++) { |
55036ba7 AS |
1113 | p = hex_byte_pack(p, *addr++); |
1114 | p = hex_byte_pack(p, *addr++); | |
8a27f7c9 | 1115 | if (fmt[0] == 'I' && i != 7) |
689afa7d HH |
1116 | *p++ = ':'; |
1117 | } | |
1118 | *p = '\0'; | |
7b9186f5 | 1119 | |
8a27f7c9 JP |
1120 | return p; |
1121 | } | |
1122 | ||
cf3b429b JP |
1123 | static noinline_for_stack |
1124 | char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
1125 | struct printf_spec spec, const char *fmt) | |
8a27f7c9 JP |
1126 | { |
1127 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
1128 | ||
1129 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
eb78cd26 | 1130 | ip6_compressed_string(ip6_addr, addr); |
8a27f7c9 | 1131 | else |
eb78cd26 | 1132 | ip6_string(ip6_addr, addr, fmt); |
689afa7d | 1133 | |
fef20d9c | 1134 | return string(buf, end, ip6_addr, spec); |
689afa7d HH |
1135 | } |
1136 | ||
cf3b429b JP |
1137 | static noinline_for_stack |
1138 | char *ip4_addr_string(char *buf, char *end, const u8 *addr, | |
1139 | struct printf_spec spec, const char *fmt) | |
4aa99606 | 1140 | { |
8a27f7c9 | 1141 | char ip4_addr[sizeof("255.255.255.255")]; |
4aa99606 | 1142 | |
0159f24e | 1143 | ip4_string(ip4_addr, addr, fmt); |
4aa99606 | 1144 | |
fef20d9c | 1145 | return string(buf, end, ip4_addr, spec); |
4aa99606 HH |
1146 | } |
1147 | ||
10679643 DB |
1148 | static noinline_for_stack |
1149 | char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa, | |
1150 | struct printf_spec spec, const char *fmt) | |
1151 | { | |
1152 | bool have_p = false, have_s = false, have_f = false, have_c = false; | |
1153 | char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") + | |
1154 | sizeof(":12345") + sizeof("/123456789") + | |
1155 | sizeof("%1234567890")]; | |
1156 | char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr); | |
1157 | const u8 *addr = (const u8 *) &sa->sin6_addr; | |
1158 | char fmt6[2] = { fmt[0], '6' }; | |
1159 | u8 off = 0; | |
1160 | ||
1161 | fmt++; | |
1162 | while (isalpha(*++fmt)) { | |
1163 | switch (*fmt) { | |
1164 | case 'p': | |
1165 | have_p = true; | |
1166 | break; | |
1167 | case 'f': | |
1168 | have_f = true; | |
1169 | break; | |
1170 | case 's': | |
1171 | have_s = true; | |
1172 | break; | |
1173 | case 'c': | |
1174 | have_c = true; | |
1175 | break; | |
1176 | } | |
1177 | } | |
1178 | ||
1179 | if (have_p || have_s || have_f) { | |
1180 | *p = '['; | |
1181 | off = 1; | |
1182 | } | |
1183 | ||
1184 | if (fmt6[0] == 'I' && have_c) | |
1185 | p = ip6_compressed_string(ip6_addr + off, addr); | |
1186 | else | |
1187 | p = ip6_string(ip6_addr + off, addr, fmt6); | |
1188 | ||
1189 | if (have_p || have_s || have_f) | |
1190 | *p++ = ']'; | |
1191 | ||
1192 | if (have_p) { | |
1193 | *p++ = ':'; | |
1194 | p = number(p, pend, ntohs(sa->sin6_port), spec); | |
1195 | } | |
1196 | if (have_f) { | |
1197 | *p++ = '/'; | |
1198 | p = number(p, pend, ntohl(sa->sin6_flowinfo & | |
1199 | IPV6_FLOWINFO_MASK), spec); | |
1200 | } | |
1201 | if (have_s) { | |
1202 | *p++ = '%'; | |
1203 | p = number(p, pend, sa->sin6_scope_id, spec); | |
1204 | } | |
1205 | *p = '\0'; | |
1206 | ||
1207 | return string(buf, end, ip6_addr, spec); | |
1208 | } | |
1209 | ||
1210 | static noinline_for_stack | |
1211 | char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa, | |
1212 | struct printf_spec spec, const char *fmt) | |
1213 | { | |
1214 | bool have_p = false; | |
1215 | char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")]; | |
1216 | char *pend = ip4_addr + sizeof(ip4_addr); | |
1217 | const u8 *addr = (const u8 *) &sa->sin_addr.s_addr; | |
1218 | char fmt4[3] = { fmt[0], '4', 0 }; | |
1219 | ||
1220 | fmt++; | |
1221 | while (isalpha(*++fmt)) { | |
1222 | switch (*fmt) { | |
1223 | case 'p': | |
1224 | have_p = true; | |
1225 | break; | |
1226 | case 'h': | |
1227 | case 'l': | |
1228 | case 'n': | |
1229 | case 'b': | |
1230 | fmt4[2] = *fmt; | |
1231 | break; | |
1232 | } | |
1233 | } | |
1234 | ||
1235 | p = ip4_string(ip4_addr, addr, fmt4); | |
1236 | if (have_p) { | |
1237 | *p++ = ':'; | |
1238 | p = number(p, pend, ntohs(sa->sin_port), spec); | |
1239 | } | |
1240 | *p = '\0'; | |
1241 | ||
1242 | return string(buf, end, ip4_addr, spec); | |
1243 | } | |
1244 | ||
71dca95d AS |
1245 | static noinline_for_stack |
1246 | char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
1247 | const char *fmt) | |
1248 | { | |
1249 | bool found = true; | |
1250 | int count = 1; | |
1251 | unsigned int flags = 0; | |
1252 | int len; | |
1253 | ||
1254 | if (spec.field_width == 0) | |
1255 | return buf; /* nothing to print */ | |
1256 | ||
1257 | if (ZERO_OR_NULL_PTR(addr)) | |
1258 | return string(buf, end, NULL, spec); /* NULL pointer */ | |
1259 | ||
1260 | ||
1261 | do { | |
1262 | switch (fmt[count++]) { | |
1263 | case 'a': | |
1264 | flags |= ESCAPE_ANY; | |
1265 | break; | |
1266 | case 'c': | |
1267 | flags |= ESCAPE_SPECIAL; | |
1268 | break; | |
1269 | case 'h': | |
1270 | flags |= ESCAPE_HEX; | |
1271 | break; | |
1272 | case 'n': | |
1273 | flags |= ESCAPE_NULL; | |
1274 | break; | |
1275 | case 'o': | |
1276 | flags |= ESCAPE_OCTAL; | |
1277 | break; | |
1278 | case 'p': | |
1279 | flags |= ESCAPE_NP; | |
1280 | break; | |
1281 | case 's': | |
1282 | flags |= ESCAPE_SPACE; | |
1283 | break; | |
1284 | default: | |
1285 | found = false; | |
1286 | break; | |
1287 | } | |
1288 | } while (found); | |
1289 | ||
1290 | if (!flags) | |
1291 | flags = ESCAPE_ANY_NP; | |
1292 | ||
1293 | len = spec.field_width < 0 ? 1 : spec.field_width; | |
1294 | ||
41416f23 RV |
1295 | /* |
1296 | * string_escape_mem() writes as many characters as it can to | |
1297 | * the given buffer, and returns the total size of the output | |
1298 | * had the buffer been big enough. | |
1299 | */ | |
1300 | buf += string_escape_mem(addr, len, buf, buf < end ? end - buf : 0, flags, NULL); | |
71dca95d AS |
1301 | |
1302 | return buf; | |
1303 | } | |
1304 | ||
cf3b429b JP |
1305 | static noinline_for_stack |
1306 | char *uuid_string(char *buf, char *end, const u8 *addr, | |
1307 | struct printf_spec spec, const char *fmt) | |
9ac6e44e | 1308 | { |
2b1b0d66 | 1309 | char uuid[UUID_STRING_LEN + 1]; |
9ac6e44e JP |
1310 | char *p = uuid; |
1311 | int i; | |
f9727a17 | 1312 | const u8 *index = uuid_index; |
9ac6e44e JP |
1313 | bool uc = false; |
1314 | ||
1315 | switch (*(++fmt)) { | |
1316 | case 'L': | |
1317 | uc = true; /* fall-through */ | |
1318 | case 'l': | |
f9727a17 | 1319 | index = guid_index; |
9ac6e44e JP |
1320 | break; |
1321 | case 'B': | |
1322 | uc = true; | |
1323 | break; | |
1324 | } | |
1325 | ||
1326 | for (i = 0; i < 16; i++) { | |
aa4ea1c3 AS |
1327 | if (uc) |
1328 | p = hex_byte_pack_upper(p, addr[index[i]]); | |
1329 | else | |
1330 | p = hex_byte_pack(p, addr[index[i]]); | |
9ac6e44e JP |
1331 | switch (i) { |
1332 | case 3: | |
1333 | case 5: | |
1334 | case 7: | |
1335 | case 9: | |
1336 | *p++ = '-'; | |
1337 | break; | |
1338 | } | |
1339 | } | |
1340 | ||
1341 | *p = 0; | |
1342 | ||
9ac6e44e JP |
1343 | return string(buf, end, uuid, spec); |
1344 | } | |
1345 | ||
57e73442 TH |
1346 | int kptr_restrict __read_mostly; |
1347 | ||
1348 | static noinline_for_stack | |
1349 | char *restricted_pointer(char *buf, char *end, const void *ptr, | |
1350 | struct printf_spec spec) | |
1351 | { | |
1352 | spec.base = 16; | |
1353 | spec.flags |= SMALL; | |
1354 | if (spec.field_width == -1) { | |
1355 | spec.field_width = 2 * sizeof(ptr); | |
1356 | spec.flags |= ZEROPAD; | |
1357 | } | |
1358 | ||
1359 | switch (kptr_restrict) { | |
1360 | case 0: | |
1361 | /* Always print %pK values */ | |
1362 | break; | |
1363 | case 1: { | |
1364 | const struct cred *cred; | |
1365 | ||
1366 | /* | |
1367 | * kptr_restrict==1 cannot be used in IRQ context | |
1368 | * because its test for CAP_SYSLOG would be meaningless. | |
1369 | */ | |
1370 | if (in_irq() || in_serving_softirq() || in_nmi()) | |
1371 | return string(buf, end, "pK-error", spec); | |
1372 | ||
1373 | /* | |
1374 | * Only print the real pointer value if the current | |
1375 | * process has CAP_SYSLOG and is running with the | |
1376 | * same credentials it started with. This is because | |
1377 | * access to files is checked at open() time, but %pK | |
1378 | * checks permission at read() time. We don't want to | |
1379 | * leak pointer values if a binary opens a file using | |
1380 | * %pK and then elevates privileges before reading it. | |
1381 | */ | |
1382 | cred = current_cred(); | |
1383 | if (!has_capability_noaudit(current, CAP_SYSLOG) || | |
1384 | !uid_eq(cred->euid, cred->uid) || | |
1385 | !gid_eq(cred->egid, cred->gid)) | |
1386 | ptr = NULL; | |
1387 | break; | |
1388 | } | |
1389 | case 2: | |
1390 | default: | |
1391 | /* Always print 0's for %pK */ | |
1392 | ptr = NULL; | |
1393 | break; | |
1394 | } | |
1395 | ||
1396 | return number(buf, end, (unsigned long)ptr, spec); | |
1397 | } | |
1398 | ||
5b17aecf AS |
1399 | static noinline_for_stack |
1400 | char *netdev_bits(char *buf, char *end, const void *addr, const char *fmt) | |
c8f44aff | 1401 | { |
5b17aecf AS |
1402 | unsigned long long num; |
1403 | int size; | |
1404 | ||
1405 | switch (fmt[1]) { | |
1406 | case 'F': | |
1407 | num = *(const netdev_features_t *)addr; | |
1408 | size = sizeof(netdev_features_t); | |
1409 | break; | |
1410 | default: | |
1411 | num = (unsigned long)addr; | |
1412 | size = sizeof(unsigned long); | |
1413 | break; | |
1414 | } | |
c8f44aff | 1415 | |
3cab1e71 | 1416 | return special_hex_number(buf, end, num, size); |
c8f44aff MM |
1417 | } |
1418 | ||
aaf07621 | 1419 | static noinline_for_stack |
3cab1e71 | 1420 | char *address_val(char *buf, char *end, const void *addr, const char *fmt) |
aaf07621 JP |
1421 | { |
1422 | unsigned long long num; | |
3cab1e71 | 1423 | int size; |
aaf07621 JP |
1424 | |
1425 | switch (fmt[1]) { | |
1426 | case 'd': | |
1427 | num = *(const dma_addr_t *)addr; | |
3cab1e71 | 1428 | size = sizeof(dma_addr_t); |
aaf07621 JP |
1429 | break; |
1430 | case 'p': | |
1431 | default: | |
1432 | num = *(const phys_addr_t *)addr; | |
3cab1e71 | 1433 | size = sizeof(phys_addr_t); |
aaf07621 JP |
1434 | break; |
1435 | } | |
1436 | ||
3cab1e71 | 1437 | return special_hex_number(buf, end, num, size); |
aaf07621 JP |
1438 | } |
1439 | ||
900cca29 GU |
1440 | static noinline_for_stack |
1441 | char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec, | |
1442 | const char *fmt) | |
1443 | { | |
1444 | if (!IS_ENABLED(CONFIG_HAVE_CLK) || !clk) | |
1445 | return string(buf, end, NULL, spec); | |
1446 | ||
1447 | switch (fmt[1]) { | |
1448 | case 'r': | |
1449 | return number(buf, end, clk_get_rate(clk), spec); | |
1450 | ||
1451 | case 'n': | |
1452 | default: | |
1453 | #ifdef CONFIG_COMMON_CLK | |
1454 | return string(buf, end, __clk_get_name(clk), spec); | |
1455 | #else | |
3cab1e71 | 1456 | return special_hex_number(buf, end, (unsigned long)clk, sizeof(unsigned long)); |
900cca29 GU |
1457 | #endif |
1458 | } | |
1459 | } | |
1460 | ||
edf14cdb VB |
1461 | static |
1462 | char *format_flags(char *buf, char *end, unsigned long flags, | |
1463 | const struct trace_print_flags *names) | |
1464 | { | |
1465 | unsigned long mask; | |
1466 | const struct printf_spec strspec = { | |
1467 | .field_width = -1, | |
1468 | .precision = -1, | |
1469 | }; | |
1470 | const struct printf_spec numspec = { | |
1471 | .flags = SPECIAL|SMALL, | |
1472 | .field_width = -1, | |
1473 | .precision = -1, | |
1474 | .base = 16, | |
1475 | }; | |
1476 | ||
1477 | for ( ; flags && names->name; names++) { | |
1478 | mask = names->mask; | |
1479 | if ((flags & mask) != mask) | |
1480 | continue; | |
1481 | ||
1482 | buf = string(buf, end, names->name, strspec); | |
1483 | ||
1484 | flags &= ~mask; | |
1485 | if (flags) { | |
1486 | if (buf < end) | |
1487 | *buf = '|'; | |
1488 | buf++; | |
1489 | } | |
1490 | } | |
1491 | ||
1492 | if (flags) | |
1493 | buf = number(buf, end, flags, numspec); | |
1494 | ||
1495 | return buf; | |
1496 | } | |
1497 | ||
1498 | static noinline_for_stack | |
1499 | char *flags_string(char *buf, char *end, void *flags_ptr, const char *fmt) | |
1500 | { | |
1501 | unsigned long flags; | |
1502 | const struct trace_print_flags *names; | |
1503 | ||
1504 | switch (fmt[1]) { | |
1505 | case 'p': | |
1506 | flags = *(unsigned long *)flags_ptr; | |
1507 | /* Remove zone id */ | |
1508 | flags &= (1UL << NR_PAGEFLAGS) - 1; | |
1509 | names = pageflag_names; | |
1510 | break; | |
1511 | case 'v': | |
1512 | flags = *(unsigned long *)flags_ptr; | |
1513 | names = vmaflag_names; | |
1514 | break; | |
1515 | case 'g': | |
1516 | flags = *(gfp_t *)flags_ptr; | |
1517 | names = gfpflag_names; | |
1518 | break; | |
1519 | default: | |
1520 | WARN_ONCE(1, "Unsupported flags modifier: %c\n", fmt[1]); | |
1521 | return buf; | |
1522 | } | |
1523 | ||
1524 | return format_flags(buf, end, flags, names); | |
1525 | } | |
1526 | ||
ce4fecf1 PA |
1527 | static const char *device_node_name_for_depth(const struct device_node *np, int depth) |
1528 | { | |
1529 | for ( ; np && depth; depth--) | |
1530 | np = np->parent; | |
1531 | ||
1532 | return kbasename(np->full_name); | |
1533 | } | |
1534 | ||
1535 | static noinline_for_stack | |
1536 | char *device_node_gen_full_name(const struct device_node *np, char *buf, char *end) | |
1537 | { | |
1538 | int depth; | |
1539 | const struct device_node *parent = np->parent; | |
1540 | static const struct printf_spec strspec = { | |
1541 | .field_width = -1, | |
1542 | .precision = -1, | |
1543 | }; | |
1544 | ||
1545 | /* special case for root node */ | |
1546 | if (!parent) | |
1547 | return string(buf, end, "/", strspec); | |
1548 | ||
1549 | for (depth = 0; parent->parent; depth++) | |
1550 | parent = parent->parent; | |
1551 | ||
1552 | for ( ; depth >= 0; depth--) { | |
1553 | buf = string(buf, end, "/", strspec); | |
1554 | buf = string(buf, end, device_node_name_for_depth(np, depth), | |
1555 | strspec); | |
1556 | } | |
1557 | return buf; | |
1558 | } | |
1559 | ||
1560 | static noinline_for_stack | |
1561 | char *device_node_string(char *buf, char *end, struct device_node *dn, | |
1562 | struct printf_spec spec, const char *fmt) | |
1563 | { | |
1564 | char tbuf[sizeof("xxxx") + 1]; | |
1565 | const char *p; | |
1566 | int ret; | |
1567 | char *buf_start = buf; | |
1568 | struct property *prop; | |
1569 | bool has_mult, pass; | |
1570 | static const struct printf_spec num_spec = { | |
1571 | .flags = SMALL, | |
1572 | .field_width = -1, | |
1573 | .precision = -1, | |
1574 | .base = 10, | |
1575 | }; | |
1576 | ||
1577 | struct printf_spec str_spec = spec; | |
1578 | str_spec.field_width = -1; | |
1579 | ||
1580 | if (!IS_ENABLED(CONFIG_OF)) | |
1581 | return string(buf, end, "(!OF)", spec); | |
1582 | ||
1583 | if ((unsigned long)dn < PAGE_SIZE) | |
1584 | return string(buf, end, "(null)", spec); | |
1585 | ||
1586 | /* simple case without anything any more format specifiers */ | |
1587 | fmt++; | |
1588 | if (fmt[0] == '\0' || strcspn(fmt,"fnpPFcC") > 0) | |
1589 | fmt = "f"; | |
1590 | ||
1591 | for (pass = false; strspn(fmt,"fnpPFcC"); fmt++, pass = true) { | |
1592 | if (pass) { | |
1593 | if (buf < end) | |
1594 | *buf = ':'; | |
1595 | buf++; | |
1596 | } | |
1597 | ||
1598 | switch (*fmt) { | |
1599 | case 'f': /* full_name */ | |
1600 | buf = device_node_gen_full_name(dn, buf, end); | |
1601 | break; | |
1602 | case 'n': /* name */ | |
1603 | buf = string(buf, end, dn->name, str_spec); | |
1604 | break; | |
1605 | case 'p': /* phandle */ | |
1606 | buf = number(buf, end, (unsigned int)dn->phandle, num_spec); | |
1607 | break; | |
1608 | case 'P': /* path-spec */ | |
1609 | p = kbasename(of_node_full_name(dn)); | |
1610 | if (!p[1]) | |
1611 | p = "/"; | |
1612 | buf = string(buf, end, p, str_spec); | |
1613 | break; | |
1614 | case 'F': /* flags */ | |
1615 | tbuf[0] = of_node_check_flag(dn, OF_DYNAMIC) ? 'D' : '-'; | |
1616 | tbuf[1] = of_node_check_flag(dn, OF_DETACHED) ? 'd' : '-'; | |
1617 | tbuf[2] = of_node_check_flag(dn, OF_POPULATED) ? 'P' : '-'; | |
1618 | tbuf[3] = of_node_check_flag(dn, OF_POPULATED_BUS) ? 'B' : '-'; | |
1619 | tbuf[4] = 0; | |
1620 | buf = string(buf, end, tbuf, str_spec); | |
1621 | break; | |
1622 | case 'c': /* major compatible string */ | |
1623 | ret = of_property_read_string(dn, "compatible", &p); | |
1624 | if (!ret) | |
1625 | buf = string(buf, end, p, str_spec); | |
1626 | break; | |
1627 | case 'C': /* full compatible string */ | |
1628 | has_mult = false; | |
1629 | of_property_for_each_string(dn, "compatible", prop, p) { | |
1630 | if (has_mult) | |
1631 | buf = string(buf, end, ",", str_spec); | |
1632 | buf = string(buf, end, "\"", str_spec); | |
1633 | buf = string(buf, end, p, str_spec); | |
1634 | buf = string(buf, end, "\"", str_spec); | |
1635 | ||
1636 | has_mult = true; | |
1637 | } | |
1638 | break; | |
1639 | default: | |
1640 | break; | |
1641 | } | |
1642 | } | |
1643 | ||
1644 | return widen_string(buf, buf - buf_start, end, spec); | |
1645 | } | |
1646 | ||
4d8a743c LT |
1647 | /* |
1648 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
1649 | * by an extra set of alphanumeric characters that are extended format | |
1650 | * specifiers. | |
1651 | * | |
0b523769 JP |
1652 | * Please update scripts/checkpatch.pl when adding/removing conversion |
1653 | * characters. (Search for "check for vsprintf extension"). | |
1654 | * | |
332d2e78 LT |
1655 | * Right now we handle: |
1656 | * | |
0c8b946e FW |
1657 | * - 'F' For symbolic function descriptor pointers with offset |
1658 | * - 'f' For simple symbolic function names without offset | |
0efb4d20 SR |
1659 | * - 'S' For symbolic direct pointers with offset |
1660 | * - 's' For symbolic direct pointers without offset | |
b0d33c2b | 1661 | * - '[FfSs]R' as above with __builtin_extract_return_addr() translation |
0f77a8d3 | 1662 | * - 'B' For backtraced symbolic direct pointers with offset |
c7dabef8 BH |
1663 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] |
1664 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] | |
dbc760bc TH |
1665 | * - 'b[l]' For a bitmap, the number of bits is determined by the field |
1666 | * width which must be explicitly specified either as part of the | |
1667 | * format string '%32b[l]' or through '%*b[l]', [l] selects | |
1668 | * range-list format instead of hex format | |
dd45c9cf HH |
1669 | * - 'M' For a 6-byte MAC address, it prints the address in the |
1670 | * usual colon-separated hex notation | |
8a27f7c9 | 1671 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons |
bc7259a2 | 1672 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address |
c8e00060 | 1673 | * with a dash-separated hex notation |
7c59154e | 1674 | * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth) |
8a27f7c9 JP |
1675 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way |
1676 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
1677 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
10679643 DB |
1678 | * [S][pfs] |
1679 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1680 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
8a27f7c9 JP |
1681 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses |
1682 | * IPv6 omits the colons (01020304...0f) | |
1683 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
10679643 DB |
1684 | * [S][pfs] |
1685 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1686 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
1687 | * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order | |
1688 | * - 'I[6S]c' for IPv6 addresses printed as specified by | |
29cf519e | 1689 | * http://tools.ietf.org/html/rfc5952 |
71dca95d AS |
1690 | * - 'E[achnops]' For an escaped buffer, where rules are defined by combination |
1691 | * of the following flags (see string_escape_mem() for the | |
1692 | * details): | |
1693 | * a - ESCAPE_ANY | |
1694 | * c - ESCAPE_SPECIAL | |
1695 | * h - ESCAPE_HEX | |
1696 | * n - ESCAPE_NULL | |
1697 | * o - ESCAPE_OCTAL | |
1698 | * p - ESCAPE_NP | |
1699 | * s - ESCAPE_SPACE | |
1700 | * By default ESCAPE_ANY_NP is used. | |
9ac6e44e JP |
1701 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form |
1702 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" | |
1703 | * Options for %pU are: | |
1704 | * b big endian lower case hex (default) | |
1705 | * B big endian UPPER case hex | |
1706 | * l little endian lower case hex | |
1707 | * L little endian UPPER case hex | |
1708 | * big endian output byte order is: | |
1709 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] | |
1710 | * little endian output byte order is: | |
1711 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] | |
7db6f5fb JP |
1712 | * - 'V' For a struct va_format which contains a format string * and va_list *, |
1713 | * call vsnprintf(->format, *->va_list). | |
1714 | * Implements a "recursive vsnprintf". | |
1715 | * Do not use this feature without some mechanism to verify the | |
1716 | * correctness of the format string and va_list arguments. | |
455cd5ab | 1717 | * - 'K' For a kernel pointer that should be hidden from unprivileged users |
c8f44aff | 1718 | * - 'NF' For a netdev_features_t |
31550a16 AS |
1719 | * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with |
1720 | * a certain separator (' ' by default): | |
1721 | * C colon | |
1722 | * D dash | |
1723 | * N no separator | |
1724 | * The maximum supported length is 64 bytes of the input. Consider | |
1725 | * to use print_hex_dump() for the larger input. | |
aaf07621 JP |
1726 | * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives |
1727 | * (default assumed to be phys_addr_t, passed by reference) | |
c0d92a57 OJ |
1728 | * - 'd[234]' For a dentry name (optionally 2-4 last components) |
1729 | * - 'D[234]' Same as 'd' but for a struct file | |
1031bc58 | 1730 | * - 'g' For block_device name (gendisk + partition number) |
900cca29 GU |
1731 | * - 'C' For a clock, it prints the name (Common Clock Framework) or address |
1732 | * (legacy clock framework) of the clock | |
1733 | * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address | |
1734 | * (legacy clock framework) of the clock | |
1735 | * - 'Cr' For a clock, it prints the current rate of the clock | |
edf14cdb VB |
1736 | * - 'G' For flags to be printed as a collection of symbolic strings that would |
1737 | * construct the specific value. Supported flags given by option: | |
1738 | * p page flags (see struct page) given as pointer to unsigned long | |
1739 | * g gfp flags (GFP_* and __GFP_*) given as pointer to gfp_t | |
1740 | * v vma flags (VM_*) given as pointer to unsigned long | |
ce4fecf1 PA |
1741 | * - 'O' For a kobject based struct. Must be one of the following: |
1742 | * - 'OF[fnpPcCF]' For a device tree object | |
1743 | * Without any optional arguments prints the full_name | |
1744 | * f device node full_name | |
1745 | * n device node name | |
1746 | * p device node phandle | |
1747 | * P device node path spec (name + @unit) | |
1748 | * F device node flags | |
1749 | * c major compatible string | |
1750 | * C full compatible string | |
5e4ee7b1 MK |
1751 | * |
1752 | * ** Please update also Documentation/printk-formats.txt when making changes ** | |
9ac6e44e | 1753 | * |
332d2e78 LT |
1754 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 |
1755 | * function pointers are really function descriptors, which contain a | |
1756 | * pointer to the real address. | |
4d8a743c | 1757 | */ |
cf3b429b JP |
1758 | static noinline_for_stack |
1759 | char *pointer(const char *fmt, char *buf, char *end, void *ptr, | |
1760 | struct printf_spec spec) | |
78a8bf69 | 1761 | { |
80c9eb46 | 1762 | const int default_width = 2 * sizeof(void *); |
725fe002 | 1763 | |
9f36e2c4 | 1764 | if (!ptr && *fmt != 'K') { |
5e057981 JP |
1765 | /* |
1766 | * Print (null) with the same width as a pointer so it makes | |
1767 | * tabular output look nice. | |
1768 | */ | |
1769 | if (spec.field_width == -1) | |
725fe002 | 1770 | spec.field_width = default_width; |
fef20d9c | 1771 | return string(buf, end, "(null)", spec); |
5e057981 | 1772 | } |
d97106ab | 1773 | |
0fe1ef24 LT |
1774 | switch (*fmt) { |
1775 | case 'F': | |
0c8b946e | 1776 | case 'f': |
0fe1ef24 LT |
1777 | ptr = dereference_function_descriptor(ptr); |
1778 | /* Fallthrough */ | |
1779 | case 'S': | |
9ac6e44e | 1780 | case 's': |
0f77a8d3 | 1781 | case 'B': |
b0d33c2b | 1782 | return symbol_string(buf, end, ptr, spec, fmt); |
332d2e78 | 1783 | case 'R': |
c7dabef8 | 1784 | case 'r': |
fd95541e | 1785 | return resource_string(buf, end, ptr, spec, fmt); |
31550a16 AS |
1786 | case 'h': |
1787 | return hex_string(buf, end, ptr, spec, fmt); | |
dbc760bc TH |
1788 | case 'b': |
1789 | switch (fmt[1]) { | |
1790 | case 'l': | |
1791 | return bitmap_list_string(buf, end, ptr, spec, fmt); | |
1792 | default: | |
1793 | return bitmap_string(buf, end, ptr, spec, fmt); | |
1794 | } | |
8a27f7c9 JP |
1795 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
1796 | case 'm': /* Contiguous: 000102030405 */ | |
76597ff9 AE |
1797 | /* [mM]F (FDDI) */ |
1798 | /* [mM]R (Reverse order; Bluetooth) */ | |
8a27f7c9 JP |
1799 | return mac_address_string(buf, end, ptr, spec, fmt); |
1800 | case 'I': /* Formatted IP supported | |
1801 | * 4: 1.2.3.4 | |
1802 | * 6: 0001:0203:...:0708 | |
1803 | * 6c: 1::708 or 1::1.2.3.4 | |
1804 | */ | |
1805 | case 'i': /* Contiguous: | |
1806 | * 4: 001.002.003.004 | |
1807 | * 6: 000102...0f | |
1808 | */ | |
1809 | switch (fmt[1]) { | |
1810 | case '6': | |
1811 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
1812 | case '4': | |
1813 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
10679643 DB |
1814 | case 'S': { |
1815 | const union { | |
1816 | struct sockaddr raw; | |
1817 | struct sockaddr_in v4; | |
1818 | struct sockaddr_in6 v6; | |
1819 | } *sa = ptr; | |
1820 | ||
1821 | switch (sa->raw.sa_family) { | |
1822 | case AF_INET: | |
1823 | return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt); | |
1824 | case AF_INET6: | |
1825 | return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt); | |
1826 | default: | |
1827 | return string(buf, end, "(invalid address)", spec); | |
1828 | }} | |
8a27f7c9 | 1829 | } |
fef20d9c | 1830 | break; |
71dca95d AS |
1831 | case 'E': |
1832 | return escaped_string(buf, end, ptr, spec, fmt); | |
9ac6e44e JP |
1833 | case 'U': |
1834 | return uuid_string(buf, end, ptr, spec, fmt); | |
7db6f5fb | 1835 | case 'V': |
5756b76e JB |
1836 | { |
1837 | va_list va; | |
1838 | ||
1839 | va_copy(va, *((struct va_format *)ptr)->va); | |
1840 | buf += vsnprintf(buf, end > buf ? end - buf : 0, | |
1841 | ((struct va_format *)ptr)->fmt, va); | |
1842 | va_end(va); | |
1843 | return buf; | |
1844 | } | |
455cd5ab | 1845 | case 'K': |
57e73442 | 1846 | return restricted_pointer(buf, end, ptr, spec); |
c8f44aff | 1847 | case 'N': |
5b17aecf | 1848 | return netdev_bits(buf, end, ptr, fmt); |
7d799210 | 1849 | case 'a': |
3cab1e71 | 1850 | return address_val(buf, end, ptr, fmt); |
4b6ccca7 AV |
1851 | case 'd': |
1852 | return dentry_name(buf, end, ptr, spec, fmt); | |
900cca29 GU |
1853 | case 'C': |
1854 | return clock(buf, end, ptr, spec, fmt); | |
4b6ccca7 AV |
1855 | case 'D': |
1856 | return dentry_name(buf, end, | |
1857 | ((const struct file *)ptr)->f_path.dentry, | |
1858 | spec, fmt); | |
1031bc58 DM |
1859 | #ifdef CONFIG_BLOCK |
1860 | case 'g': | |
1861 | return bdev_name(buf, end, ptr, spec, fmt); | |
1862 | #endif | |
1863 | ||
edf14cdb VB |
1864 | case 'G': |
1865 | return flags_string(buf, end, ptr, fmt); | |
ce4fecf1 PA |
1866 | case 'O': |
1867 | switch (fmt[1]) { | |
1868 | case 'F': | |
1869 | return device_node_string(buf, end, ptr, spec, fmt + 1); | |
1870 | } | |
fef20d9c FW |
1871 | } |
1872 | spec.flags |= SMALL; | |
1873 | if (spec.field_width == -1) { | |
725fe002 | 1874 | spec.field_width = default_width; |
fef20d9c FW |
1875 | spec.flags |= ZEROPAD; |
1876 | } | |
1877 | spec.base = 16; | |
1878 | ||
1879 | return number(buf, end, (unsigned long) ptr, spec); | |
1880 | } | |
1881 | ||
1882 | /* | |
1883 | * Helper function to decode printf style format. | |
1884 | * Each call decode a token from the format and return the | |
1885 | * number of characters read (or likely the delta where it wants | |
1886 | * to go on the next call). | |
1887 | * The decoded token is returned through the parameters | |
1888 | * | |
1889 | * 'h', 'l', or 'L' for integer fields | |
1890 | * 'z' support added 23/7/1999 S.H. | |
1891 | * 'z' changed to 'Z' --davidm 1/25/99 | |
5b5e0928 | 1892 | * 'Z' changed to 'z' --adobriyan 2017-01-25 |
fef20d9c FW |
1893 | * 't' added for ptrdiff_t |
1894 | * | |
1895 | * @fmt: the format string | |
1896 | * @type of the token returned | |
1897 | * @flags: various flags such as +, -, # tokens.. | |
1898 | * @field_width: overwritten width | |
1899 | * @base: base of the number (octal, hex, ...) | |
1900 | * @precision: precision of a number | |
1901 | * @qualifier: qualifier of a number (long, size_t, ...) | |
1902 | */ | |
cf3b429b JP |
1903 | static noinline_for_stack |
1904 | int format_decode(const char *fmt, struct printf_spec *spec) | |
fef20d9c FW |
1905 | { |
1906 | const char *start = fmt; | |
d0484193 | 1907 | char qualifier; |
fef20d9c FW |
1908 | |
1909 | /* we finished early by reading the field width */ | |
ed681a91 | 1910 | if (spec->type == FORMAT_TYPE_WIDTH) { |
fef20d9c FW |
1911 | if (spec->field_width < 0) { |
1912 | spec->field_width = -spec->field_width; | |
1913 | spec->flags |= LEFT; | |
1914 | } | |
1915 | spec->type = FORMAT_TYPE_NONE; | |
1916 | goto precision; | |
1917 | } | |
1918 | ||
1919 | /* we finished early by reading the precision */ | |
1920 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
1921 | if (spec->precision < 0) | |
1922 | spec->precision = 0; | |
1923 | ||
1924 | spec->type = FORMAT_TYPE_NONE; | |
1925 | goto qualifier; | |
1926 | } | |
1927 | ||
1928 | /* By default */ | |
1929 | spec->type = FORMAT_TYPE_NONE; | |
1930 | ||
1931 | for (; *fmt ; ++fmt) { | |
1932 | if (*fmt == '%') | |
1933 | break; | |
1934 | } | |
1935 | ||
1936 | /* Return the current non-format string */ | |
1937 | if (fmt != start || !*fmt) | |
1938 | return fmt - start; | |
1939 | ||
1940 | /* Process flags */ | |
1941 | spec->flags = 0; | |
1942 | ||
1943 | while (1) { /* this also skips first '%' */ | |
1944 | bool found = true; | |
1945 | ||
1946 | ++fmt; | |
1947 | ||
1948 | switch (*fmt) { | |
1949 | case '-': spec->flags |= LEFT; break; | |
1950 | case '+': spec->flags |= PLUS; break; | |
1951 | case ' ': spec->flags |= SPACE; break; | |
1952 | case '#': spec->flags |= SPECIAL; break; | |
1953 | case '0': spec->flags |= ZEROPAD; break; | |
1954 | default: found = false; | |
1955 | } | |
1956 | ||
1957 | if (!found) | |
1958 | break; | |
1959 | } | |
1960 | ||
1961 | /* get field width */ | |
1962 | spec->field_width = -1; | |
1963 | ||
1964 | if (isdigit(*fmt)) | |
1965 | spec->field_width = skip_atoi(&fmt); | |
1966 | else if (*fmt == '*') { | |
1967 | /* it's the next argument */ | |
ed681a91 | 1968 | spec->type = FORMAT_TYPE_WIDTH; |
fef20d9c FW |
1969 | return ++fmt - start; |
1970 | } | |
1971 | ||
1972 | precision: | |
1973 | /* get the precision */ | |
1974 | spec->precision = -1; | |
1975 | if (*fmt == '.') { | |
1976 | ++fmt; | |
1977 | if (isdigit(*fmt)) { | |
1978 | spec->precision = skip_atoi(&fmt); | |
1979 | if (spec->precision < 0) | |
1980 | spec->precision = 0; | |
1981 | } else if (*fmt == '*') { | |
1982 | /* it's the next argument */ | |
adf26f84 | 1983 | spec->type = FORMAT_TYPE_PRECISION; |
fef20d9c FW |
1984 | return ++fmt - start; |
1985 | } | |
1986 | } | |
1987 | ||
1988 | qualifier: | |
1989 | /* get the conversion qualifier */ | |
d0484193 | 1990 | qualifier = 0; |
75fb8f26 | 1991 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
5b5e0928 | 1992 | *fmt == 'z' || *fmt == 't') { |
d0484193 RV |
1993 | qualifier = *fmt++; |
1994 | if (unlikely(qualifier == *fmt)) { | |
1995 | if (qualifier == 'l') { | |
1996 | qualifier = 'L'; | |
a4e94ef0 | 1997 | ++fmt; |
d0484193 RV |
1998 | } else if (qualifier == 'h') { |
1999 | qualifier = 'H'; | |
a4e94ef0 Z |
2000 | ++fmt; |
2001 | } | |
fef20d9c FW |
2002 | } |
2003 | } | |
2004 | ||
2005 | /* default base */ | |
2006 | spec->base = 10; | |
2007 | switch (*fmt) { | |
2008 | case 'c': | |
2009 | spec->type = FORMAT_TYPE_CHAR; | |
2010 | return ++fmt - start; | |
2011 | ||
2012 | case 's': | |
2013 | spec->type = FORMAT_TYPE_STR; | |
2014 | return ++fmt - start; | |
2015 | ||
2016 | case 'p': | |
2017 | spec->type = FORMAT_TYPE_PTR; | |
ffbfed03 | 2018 | return ++fmt - start; |
fef20d9c | 2019 | |
fef20d9c FW |
2020 | case '%': |
2021 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
2022 | return ++fmt - start; | |
2023 | ||
2024 | /* integer number formats - set up the flags and "break" */ | |
2025 | case 'o': | |
2026 | spec->base = 8; | |
2027 | break; | |
2028 | ||
2029 | case 'x': | |
2030 | spec->flags |= SMALL; | |
2031 | ||
2032 | case 'X': | |
2033 | spec->base = 16; | |
2034 | break; | |
2035 | ||
2036 | case 'd': | |
2037 | case 'i': | |
39e874f8 | 2038 | spec->flags |= SIGN; |
fef20d9c | 2039 | case 'u': |
4aa99606 | 2040 | break; |
fef20d9c | 2041 | |
708d96fd RM |
2042 | case 'n': |
2043 | /* | |
b006f19b RV |
2044 | * Since %n poses a greater security risk than |
2045 | * utility, treat it as any other invalid or | |
2046 | * unsupported format specifier. | |
708d96fd | 2047 | */ |
708d96fd RM |
2048 | /* Fall-through */ |
2049 | ||
fef20d9c | 2050 | default: |
b006f19b | 2051 | WARN_ONCE(1, "Please remove unsupported %%%c in format string\n", *fmt); |
fef20d9c FW |
2052 | spec->type = FORMAT_TYPE_INVALID; |
2053 | return fmt - start; | |
0fe1ef24 | 2054 | } |
fef20d9c | 2055 | |
d0484193 | 2056 | if (qualifier == 'L') |
fef20d9c | 2057 | spec->type = FORMAT_TYPE_LONG_LONG; |
d0484193 | 2058 | else if (qualifier == 'l') { |
51be17df RV |
2059 | BUILD_BUG_ON(FORMAT_TYPE_ULONG + SIGN != FORMAT_TYPE_LONG); |
2060 | spec->type = FORMAT_TYPE_ULONG + (spec->flags & SIGN); | |
5b5e0928 | 2061 | } else if (qualifier == 'z') { |
fef20d9c | 2062 | spec->type = FORMAT_TYPE_SIZE_T; |
d0484193 | 2063 | } else if (qualifier == 't') { |
fef20d9c | 2064 | spec->type = FORMAT_TYPE_PTRDIFF; |
d0484193 | 2065 | } else if (qualifier == 'H') { |
51be17df RV |
2066 | BUILD_BUG_ON(FORMAT_TYPE_UBYTE + SIGN != FORMAT_TYPE_BYTE); |
2067 | spec->type = FORMAT_TYPE_UBYTE + (spec->flags & SIGN); | |
d0484193 | 2068 | } else if (qualifier == 'h') { |
51be17df RV |
2069 | BUILD_BUG_ON(FORMAT_TYPE_USHORT + SIGN != FORMAT_TYPE_SHORT); |
2070 | spec->type = FORMAT_TYPE_USHORT + (spec->flags & SIGN); | |
fef20d9c | 2071 | } else { |
51be17df RV |
2072 | BUILD_BUG_ON(FORMAT_TYPE_UINT + SIGN != FORMAT_TYPE_INT); |
2073 | spec->type = FORMAT_TYPE_UINT + (spec->flags & SIGN); | |
78a8bf69 | 2074 | } |
fef20d9c FW |
2075 | |
2076 | return ++fmt - start; | |
78a8bf69 LT |
2077 | } |
2078 | ||
4d72ba01 RV |
2079 | static void |
2080 | set_field_width(struct printf_spec *spec, int width) | |
2081 | { | |
2082 | spec->field_width = width; | |
2083 | if (WARN_ONCE(spec->field_width != width, "field width %d too large", width)) { | |
2084 | spec->field_width = clamp(width, -FIELD_WIDTH_MAX, FIELD_WIDTH_MAX); | |
2085 | } | |
2086 | } | |
2087 | ||
2088 | static void | |
2089 | set_precision(struct printf_spec *spec, int prec) | |
2090 | { | |
2091 | spec->precision = prec; | |
2092 | if (WARN_ONCE(spec->precision != prec, "precision %d too large", prec)) { | |
2093 | spec->precision = clamp(prec, 0, PRECISION_MAX); | |
2094 | } | |
2095 | } | |
2096 | ||
1da177e4 LT |
2097 | /** |
2098 | * vsnprintf - Format a string and place it in a buffer | |
2099 | * @buf: The buffer to place the result into | |
2100 | * @size: The size of the buffer, including the trailing null space | |
2101 | * @fmt: The format string to use | |
2102 | * @args: Arguments for the format string | |
2103 | * | |
d7ec9a05 RV |
2104 | * This function generally follows C99 vsnprintf, but has some |
2105 | * extensions and a few limitations: | |
2106 | * | |
6cc89134 | 2107 | * - ``%n`` is unsupported |
2108 | * - ``%p*`` is handled by pointer() | |
5e4ee7b1 MK |
2109 | * |
2110 | * See pointer() or Documentation/printk-formats.txt for more | |
2111 | * extensive description. | |
20036fdc | 2112 | * |
6cc89134 | 2113 | * **Please update the documentation in both places when making changes** |
80f548e0 | 2114 | * |
1da177e4 LT |
2115 | * The return value is the number of characters which would |
2116 | * be generated for the given input, excluding the trailing | |
2117 | * '\0', as per ISO C99. If you want to have the exact | |
2118 | * number of characters written into @buf as return value | |
72fd4a35 | 2119 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
2120 | * return is greater than or equal to @size, the resulting |
2121 | * string is truncated. | |
2122 | * | |
ba1835eb | 2123 | * If you're not already dealing with a va_list consider using snprintf(). |
1da177e4 LT |
2124 | */ |
2125 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
2126 | { | |
1da177e4 | 2127 | unsigned long long num; |
d4be151b | 2128 | char *str, *end; |
fef20d9c | 2129 | struct printf_spec spec = {0}; |
1da177e4 | 2130 | |
f796937a JF |
2131 | /* Reject out-of-range values early. Large positive sizes are |
2132 | used for unknown buffer sizes. */ | |
2aa2f9e2 | 2133 | if (WARN_ON_ONCE(size > INT_MAX)) |
1da177e4 | 2134 | return 0; |
1da177e4 LT |
2135 | |
2136 | str = buf; | |
f796937a | 2137 | end = buf + size; |
1da177e4 | 2138 | |
f796937a JF |
2139 | /* Make sure end is always >= buf */ |
2140 | if (end < buf) { | |
2141 | end = ((void *)-1); | |
2142 | size = end - buf; | |
1da177e4 LT |
2143 | } |
2144 | ||
fef20d9c FW |
2145 | while (*fmt) { |
2146 | const char *old_fmt = fmt; | |
d4be151b | 2147 | int read = format_decode(fmt, &spec); |
1da177e4 | 2148 | |
fef20d9c | 2149 | fmt += read; |
1da177e4 | 2150 | |
fef20d9c FW |
2151 | switch (spec.type) { |
2152 | case FORMAT_TYPE_NONE: { | |
2153 | int copy = read; | |
2154 | if (str < end) { | |
2155 | if (copy > end - str) | |
2156 | copy = end - str; | |
2157 | memcpy(str, old_fmt, copy); | |
1da177e4 | 2158 | } |
fef20d9c FW |
2159 | str += read; |
2160 | break; | |
1da177e4 LT |
2161 | } |
2162 | ||
ed681a91 | 2163 | case FORMAT_TYPE_WIDTH: |
4d72ba01 | 2164 | set_field_width(&spec, va_arg(args, int)); |
fef20d9c | 2165 | break; |
1da177e4 | 2166 | |
fef20d9c | 2167 | case FORMAT_TYPE_PRECISION: |
4d72ba01 | 2168 | set_precision(&spec, va_arg(args, int)); |
fef20d9c | 2169 | break; |
1da177e4 | 2170 | |
d4be151b AGR |
2171 | case FORMAT_TYPE_CHAR: { |
2172 | char c; | |
2173 | ||
fef20d9c FW |
2174 | if (!(spec.flags & LEFT)) { |
2175 | while (--spec.field_width > 0) { | |
f796937a | 2176 | if (str < end) |
1da177e4 LT |
2177 | *str = ' '; |
2178 | ++str; | |
1da177e4 | 2179 | |
fef20d9c FW |
2180 | } |
2181 | } | |
2182 | c = (unsigned char) va_arg(args, int); | |
2183 | if (str < end) | |
2184 | *str = c; | |
2185 | ++str; | |
2186 | while (--spec.field_width > 0) { | |
f796937a | 2187 | if (str < end) |
fef20d9c | 2188 | *str = ' '; |
1da177e4 | 2189 | ++str; |
fef20d9c FW |
2190 | } |
2191 | break; | |
d4be151b | 2192 | } |
1da177e4 | 2193 | |
fef20d9c FW |
2194 | case FORMAT_TYPE_STR: |
2195 | str = string(str, end, va_arg(args, char *), spec); | |
2196 | break; | |
1da177e4 | 2197 | |
fef20d9c | 2198 | case FORMAT_TYPE_PTR: |
ffbfed03 | 2199 | str = pointer(fmt, str, end, va_arg(args, void *), |
fef20d9c FW |
2200 | spec); |
2201 | while (isalnum(*fmt)) | |
2202 | fmt++; | |
2203 | break; | |
1da177e4 | 2204 | |
fef20d9c FW |
2205 | case FORMAT_TYPE_PERCENT_CHAR: |
2206 | if (str < end) | |
2207 | *str = '%'; | |
2208 | ++str; | |
2209 | break; | |
1da177e4 | 2210 | |
fef20d9c | 2211 | case FORMAT_TYPE_INVALID: |
b006f19b RV |
2212 | /* |
2213 | * Presumably the arguments passed gcc's type | |
2214 | * checking, but there is no safe or sane way | |
2215 | * for us to continue parsing the format and | |
2216 | * fetching from the va_list; the remaining | |
2217 | * specifiers and arguments would be out of | |
2218 | * sync. | |
2219 | */ | |
2220 | goto out; | |
fef20d9c | 2221 | |
fef20d9c FW |
2222 | default: |
2223 | switch (spec.type) { | |
2224 | case FORMAT_TYPE_LONG_LONG: | |
2225 | num = va_arg(args, long long); | |
2226 | break; | |
2227 | case FORMAT_TYPE_ULONG: | |
2228 | num = va_arg(args, unsigned long); | |
2229 | break; | |
2230 | case FORMAT_TYPE_LONG: | |
2231 | num = va_arg(args, long); | |
2232 | break; | |
2233 | case FORMAT_TYPE_SIZE_T: | |
ef124960 JG |
2234 | if (spec.flags & SIGN) |
2235 | num = va_arg(args, ssize_t); | |
2236 | else | |
2237 | num = va_arg(args, size_t); | |
fef20d9c FW |
2238 | break; |
2239 | case FORMAT_TYPE_PTRDIFF: | |
2240 | num = va_arg(args, ptrdiff_t); | |
2241 | break; | |
a4e94ef0 Z |
2242 | case FORMAT_TYPE_UBYTE: |
2243 | num = (unsigned char) va_arg(args, int); | |
2244 | break; | |
2245 | case FORMAT_TYPE_BYTE: | |
2246 | num = (signed char) va_arg(args, int); | |
2247 | break; | |
fef20d9c FW |
2248 | case FORMAT_TYPE_USHORT: |
2249 | num = (unsigned short) va_arg(args, int); | |
2250 | break; | |
2251 | case FORMAT_TYPE_SHORT: | |
2252 | num = (short) va_arg(args, int); | |
2253 | break; | |
39e874f8 FW |
2254 | case FORMAT_TYPE_INT: |
2255 | num = (int) va_arg(args, int); | |
fef20d9c FW |
2256 | break; |
2257 | default: | |
2258 | num = va_arg(args, unsigned int); | |
2259 | } | |
2260 | ||
2261 | str = number(str, end, num, spec); | |
1da177e4 | 2262 | } |
1da177e4 | 2263 | } |
fef20d9c | 2264 | |
b006f19b | 2265 | out: |
f796937a JF |
2266 | if (size > 0) { |
2267 | if (str < end) | |
2268 | *str = '\0'; | |
2269 | else | |
0a6047ee | 2270 | end[-1] = '\0'; |
f796937a | 2271 | } |
fef20d9c | 2272 | |
f796937a | 2273 | /* the trailing null byte doesn't count towards the total */ |
1da177e4 | 2274 | return str-buf; |
fef20d9c | 2275 | |
1da177e4 | 2276 | } |
1da177e4 LT |
2277 | EXPORT_SYMBOL(vsnprintf); |
2278 | ||
2279 | /** | |
2280 | * vscnprintf - Format a string and place it in a buffer | |
2281 | * @buf: The buffer to place the result into | |
2282 | * @size: The size of the buffer, including the trailing null space | |
2283 | * @fmt: The format string to use | |
2284 | * @args: Arguments for the format string | |
2285 | * | |
2286 | * The return value is the number of characters which have been written into | |
b921c69f | 2287 | * the @buf not including the trailing '\0'. If @size is == 0 the function |
1da177e4 LT |
2288 | * returns 0. |
2289 | * | |
ba1835eb | 2290 | * If you're not already dealing with a va_list consider using scnprintf(). |
20036fdc AK |
2291 | * |
2292 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
2293 | */ |
2294 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
2295 | { | |
2296 | int i; | |
2297 | ||
7b9186f5 AGR |
2298 | i = vsnprintf(buf, size, fmt, args); |
2299 | ||
b921c69f AA |
2300 | if (likely(i < size)) |
2301 | return i; | |
2302 | if (size != 0) | |
2303 | return size - 1; | |
2304 | return 0; | |
1da177e4 | 2305 | } |
1da177e4 LT |
2306 | EXPORT_SYMBOL(vscnprintf); |
2307 | ||
2308 | /** | |
2309 | * snprintf - Format a string and place it in a buffer | |
2310 | * @buf: The buffer to place the result into | |
2311 | * @size: The size of the buffer, including the trailing null space | |
2312 | * @fmt: The format string to use | |
2313 | * @...: Arguments for the format string | |
2314 | * | |
2315 | * The return value is the number of characters which would be | |
2316 | * generated for the given input, excluding the trailing null, | |
2317 | * as per ISO C99. If the return is greater than or equal to | |
2318 | * @size, the resulting string is truncated. | |
20036fdc AK |
2319 | * |
2320 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 2321 | */ |
7b9186f5 | 2322 | int snprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
2323 | { |
2324 | va_list args; | |
2325 | int i; | |
2326 | ||
2327 | va_start(args, fmt); | |
7b9186f5 | 2328 | i = vsnprintf(buf, size, fmt, args); |
1da177e4 | 2329 | va_end(args); |
7b9186f5 | 2330 | |
1da177e4 LT |
2331 | return i; |
2332 | } | |
1da177e4 LT |
2333 | EXPORT_SYMBOL(snprintf); |
2334 | ||
2335 | /** | |
2336 | * scnprintf - Format a string and place it in a buffer | |
2337 | * @buf: The buffer to place the result into | |
2338 | * @size: The size of the buffer, including the trailing null space | |
2339 | * @fmt: The format string to use | |
2340 | * @...: Arguments for the format string | |
2341 | * | |
2342 | * The return value is the number of characters written into @buf not including | |
b903c0b8 | 2343 | * the trailing '\0'. If @size is == 0 the function returns 0. |
1da177e4 LT |
2344 | */ |
2345 | ||
7b9186f5 | 2346 | int scnprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
2347 | { |
2348 | va_list args; | |
2349 | int i; | |
2350 | ||
2351 | va_start(args, fmt); | |
b921c69f | 2352 | i = vscnprintf(buf, size, fmt, args); |
1da177e4 | 2353 | va_end(args); |
7b9186f5 | 2354 | |
b921c69f | 2355 | return i; |
1da177e4 LT |
2356 | } |
2357 | EXPORT_SYMBOL(scnprintf); | |
2358 | ||
2359 | /** | |
2360 | * vsprintf - Format a string and place it in a buffer | |
2361 | * @buf: The buffer to place the result into | |
2362 | * @fmt: The format string to use | |
2363 | * @args: Arguments for the format string | |
2364 | * | |
2365 | * The function returns the number of characters written | |
72fd4a35 | 2366 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
2367 | * buffer overflows. |
2368 | * | |
ba1835eb | 2369 | * If you're not already dealing with a va_list consider using sprintf(). |
20036fdc AK |
2370 | * |
2371 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
2372 | */ |
2373 | int vsprintf(char *buf, const char *fmt, va_list args) | |
2374 | { | |
2375 | return vsnprintf(buf, INT_MAX, fmt, args); | |
2376 | } | |
1da177e4 LT |
2377 | EXPORT_SYMBOL(vsprintf); |
2378 | ||
2379 | /** | |
2380 | * sprintf - Format a string and place it in a buffer | |
2381 | * @buf: The buffer to place the result into | |
2382 | * @fmt: The format string to use | |
2383 | * @...: Arguments for the format string | |
2384 | * | |
2385 | * The function returns the number of characters written | |
72fd4a35 | 2386 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 | 2387 | * buffer overflows. |
20036fdc AK |
2388 | * |
2389 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 2390 | */ |
7b9186f5 | 2391 | int sprintf(char *buf, const char *fmt, ...) |
1da177e4 LT |
2392 | { |
2393 | va_list args; | |
2394 | int i; | |
2395 | ||
2396 | va_start(args, fmt); | |
7b9186f5 | 2397 | i = vsnprintf(buf, INT_MAX, fmt, args); |
1da177e4 | 2398 | va_end(args); |
7b9186f5 | 2399 | |
1da177e4 LT |
2400 | return i; |
2401 | } | |
1da177e4 LT |
2402 | EXPORT_SYMBOL(sprintf); |
2403 | ||
4370aa4a LJ |
2404 | #ifdef CONFIG_BINARY_PRINTF |
2405 | /* | |
2406 | * bprintf service: | |
2407 | * vbin_printf() - VA arguments to binary data | |
2408 | * bstr_printf() - Binary data to text string | |
2409 | */ | |
2410 | ||
2411 | /** | |
2412 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
2413 | * @bin_buf: The buffer to place args' binary value | |
2414 | * @size: The size of the buffer(by words(32bits), not characters) | |
2415 | * @fmt: The format string to use | |
2416 | * @args: Arguments for the format string | |
2417 | * | |
2418 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
da3dae54 | 2419 | * is skipped. |
4370aa4a LJ |
2420 | * |
2421 | * The return value is the number of words(32bits) which would be generated for | |
2422 | * the given input. | |
2423 | * | |
2424 | * NOTE: | |
2425 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
2426 | * valid for bstr_printf(). | |
2427 | */ | |
2428 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
2429 | { | |
fef20d9c | 2430 | struct printf_spec spec = {0}; |
4370aa4a | 2431 | char *str, *end; |
4370aa4a LJ |
2432 | |
2433 | str = (char *)bin_buf; | |
2434 | end = (char *)(bin_buf + size); | |
2435 | ||
2436 | #define save_arg(type) \ | |
2437 | do { \ | |
2438 | if (sizeof(type) == 8) { \ | |
2439 | unsigned long long value; \ | |
2440 | str = PTR_ALIGN(str, sizeof(u32)); \ | |
2441 | value = va_arg(args, unsigned long long); \ | |
2442 | if (str + sizeof(type) <= end) { \ | |
2443 | *(u32 *)str = *(u32 *)&value; \ | |
2444 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ | |
2445 | } \ | |
2446 | } else { \ | |
2447 | unsigned long value; \ | |
2448 | str = PTR_ALIGN(str, sizeof(type)); \ | |
2449 | value = va_arg(args, int); \ | |
2450 | if (str + sizeof(type) <= end) \ | |
2451 | *(typeof(type) *)str = (type)value; \ | |
2452 | } \ | |
2453 | str += sizeof(type); \ | |
2454 | } while (0) | |
2455 | ||
fef20d9c | 2456 | while (*fmt) { |
d4be151b | 2457 | int read = format_decode(fmt, &spec); |
4370aa4a | 2458 | |
fef20d9c | 2459 | fmt += read; |
4370aa4a | 2460 | |
fef20d9c FW |
2461 | switch (spec.type) { |
2462 | case FORMAT_TYPE_NONE: | |
d4be151b | 2463 | case FORMAT_TYPE_PERCENT_CHAR: |
fef20d9c | 2464 | break; |
b006f19b RV |
2465 | case FORMAT_TYPE_INVALID: |
2466 | goto out; | |
fef20d9c | 2467 | |
ed681a91 | 2468 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
2469 | case FORMAT_TYPE_PRECISION: |
2470 | save_arg(int); | |
2471 | break; | |
2472 | ||
2473 | case FORMAT_TYPE_CHAR: | |
4370aa4a | 2474 | save_arg(char); |
fef20d9c FW |
2475 | break; |
2476 | ||
2477 | case FORMAT_TYPE_STR: { | |
4370aa4a LJ |
2478 | const char *save_str = va_arg(args, char *); |
2479 | size_t len; | |
6c356634 | 2480 | |
4370aa4a LJ |
2481 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE |
2482 | || (unsigned long)save_str < PAGE_SIZE) | |
0f4f81dc | 2483 | save_str = "(null)"; |
6c356634 AGR |
2484 | len = strlen(save_str) + 1; |
2485 | if (str + len < end) | |
2486 | memcpy(str, save_str, len); | |
2487 | str += len; | |
fef20d9c | 2488 | break; |
4370aa4a | 2489 | } |
fef20d9c FW |
2490 | |
2491 | case FORMAT_TYPE_PTR: | |
4370aa4a LJ |
2492 | save_arg(void *); |
2493 | /* skip all alphanumeric pointer suffixes */ | |
fef20d9c | 2494 | while (isalnum(*fmt)) |
4370aa4a | 2495 | fmt++; |
fef20d9c FW |
2496 | break; |
2497 | ||
fef20d9c FW |
2498 | default: |
2499 | switch (spec.type) { | |
2500 | ||
2501 | case FORMAT_TYPE_LONG_LONG: | |
4370aa4a | 2502 | save_arg(long long); |
fef20d9c FW |
2503 | break; |
2504 | case FORMAT_TYPE_ULONG: | |
2505 | case FORMAT_TYPE_LONG: | |
4370aa4a | 2506 | save_arg(unsigned long); |
fef20d9c FW |
2507 | break; |
2508 | case FORMAT_TYPE_SIZE_T: | |
4370aa4a | 2509 | save_arg(size_t); |
fef20d9c FW |
2510 | break; |
2511 | case FORMAT_TYPE_PTRDIFF: | |
4370aa4a | 2512 | save_arg(ptrdiff_t); |
fef20d9c | 2513 | break; |
a4e94ef0 Z |
2514 | case FORMAT_TYPE_UBYTE: |
2515 | case FORMAT_TYPE_BYTE: | |
2516 | save_arg(char); | |
2517 | break; | |
fef20d9c FW |
2518 | case FORMAT_TYPE_USHORT: |
2519 | case FORMAT_TYPE_SHORT: | |
4370aa4a | 2520 | save_arg(short); |
fef20d9c FW |
2521 | break; |
2522 | default: | |
4370aa4a | 2523 | save_arg(int); |
fef20d9c | 2524 | } |
4370aa4a LJ |
2525 | } |
2526 | } | |
fef20d9c | 2527 | |
b006f19b | 2528 | out: |
7b9186f5 | 2529 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
fef20d9c | 2530 | #undef save_arg |
4370aa4a LJ |
2531 | } |
2532 | EXPORT_SYMBOL_GPL(vbin_printf); | |
2533 | ||
2534 | /** | |
2535 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
2536 | * @buf: The buffer to place the result into | |
2537 | * @size: The size of the buffer, including the trailing null space | |
2538 | * @fmt: The format string to use | |
2539 | * @bin_buf: Binary arguments for the format string | |
2540 | * | |
2541 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
2542 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
2543 | * a binary buffer that generated by vbin_printf. | |
2544 | * | |
2545 | * The format follows C99 vsnprintf, but has some extensions: | |
0efb4d20 | 2546 | * see vsnprintf comment for details. |
4370aa4a LJ |
2547 | * |
2548 | * The return value is the number of characters which would | |
2549 | * be generated for the given input, excluding the trailing | |
2550 | * '\0', as per ISO C99. If you want to have the exact | |
2551 | * number of characters written into @buf as return value | |
2552 | * (not including the trailing '\0'), use vscnprintf(). If the | |
2553 | * return is greater than or equal to @size, the resulting | |
2554 | * string is truncated. | |
2555 | */ | |
2556 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
2557 | { | |
fef20d9c | 2558 | struct printf_spec spec = {0}; |
d4be151b AGR |
2559 | char *str, *end; |
2560 | const char *args = (const char *)bin_buf; | |
4370aa4a | 2561 | |
762abb51 | 2562 | if (WARN_ON_ONCE(size > INT_MAX)) |
4370aa4a | 2563 | return 0; |
4370aa4a LJ |
2564 | |
2565 | str = buf; | |
2566 | end = buf + size; | |
2567 | ||
2568 | #define get_arg(type) \ | |
2569 | ({ \ | |
2570 | typeof(type) value; \ | |
2571 | if (sizeof(type) == 8) { \ | |
2572 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
2573 | *(u32 *)&value = *(u32 *)args; \ | |
2574 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
2575 | } else { \ | |
2576 | args = PTR_ALIGN(args, sizeof(type)); \ | |
2577 | value = *(typeof(type) *)args; \ | |
2578 | } \ | |
2579 | args += sizeof(type); \ | |
2580 | value; \ | |
2581 | }) | |
2582 | ||
2583 | /* Make sure end is always >= buf */ | |
2584 | if (end < buf) { | |
2585 | end = ((void *)-1); | |
2586 | size = end - buf; | |
2587 | } | |
2588 | ||
fef20d9c | 2589 | while (*fmt) { |
fef20d9c | 2590 | const char *old_fmt = fmt; |
d4be151b | 2591 | int read = format_decode(fmt, &spec); |
4370aa4a | 2592 | |
fef20d9c | 2593 | fmt += read; |
4370aa4a | 2594 | |
fef20d9c FW |
2595 | switch (spec.type) { |
2596 | case FORMAT_TYPE_NONE: { | |
2597 | int copy = read; | |
2598 | if (str < end) { | |
2599 | if (copy > end - str) | |
2600 | copy = end - str; | |
2601 | memcpy(str, old_fmt, copy); | |
4370aa4a | 2602 | } |
fef20d9c FW |
2603 | str += read; |
2604 | break; | |
4370aa4a LJ |
2605 | } |
2606 | ||
ed681a91 | 2607 | case FORMAT_TYPE_WIDTH: |
4d72ba01 | 2608 | set_field_width(&spec, get_arg(int)); |
fef20d9c | 2609 | break; |
4370aa4a | 2610 | |
fef20d9c | 2611 | case FORMAT_TYPE_PRECISION: |
4d72ba01 | 2612 | set_precision(&spec, get_arg(int)); |
fef20d9c | 2613 | break; |
4370aa4a | 2614 | |
d4be151b AGR |
2615 | case FORMAT_TYPE_CHAR: { |
2616 | char c; | |
2617 | ||
fef20d9c FW |
2618 | if (!(spec.flags & LEFT)) { |
2619 | while (--spec.field_width > 0) { | |
4370aa4a LJ |
2620 | if (str < end) |
2621 | *str = ' '; | |
2622 | ++str; | |
2623 | } | |
2624 | } | |
2625 | c = (unsigned char) get_arg(char); | |
2626 | if (str < end) | |
2627 | *str = c; | |
2628 | ++str; | |
fef20d9c | 2629 | while (--spec.field_width > 0) { |
4370aa4a LJ |
2630 | if (str < end) |
2631 | *str = ' '; | |
2632 | ++str; | |
2633 | } | |
fef20d9c | 2634 | break; |
d4be151b | 2635 | } |
4370aa4a | 2636 | |
fef20d9c | 2637 | case FORMAT_TYPE_STR: { |
4370aa4a | 2638 | const char *str_arg = args; |
d4be151b | 2639 | args += strlen(str_arg) + 1; |
fef20d9c FW |
2640 | str = string(str, end, (char *)str_arg, spec); |
2641 | break; | |
4370aa4a LJ |
2642 | } |
2643 | ||
fef20d9c | 2644 | case FORMAT_TYPE_PTR: |
ffbfed03 | 2645 | str = pointer(fmt, str, end, get_arg(void *), spec); |
fef20d9c | 2646 | while (isalnum(*fmt)) |
4370aa4a | 2647 | fmt++; |
fef20d9c | 2648 | break; |
4370aa4a | 2649 | |
fef20d9c | 2650 | case FORMAT_TYPE_PERCENT_CHAR: |
4370aa4a LJ |
2651 | if (str < end) |
2652 | *str = '%'; | |
2653 | ++str; | |
fef20d9c FW |
2654 | break; |
2655 | ||
b006f19b RV |
2656 | case FORMAT_TYPE_INVALID: |
2657 | goto out; | |
2658 | ||
d4be151b AGR |
2659 | default: { |
2660 | unsigned long long num; | |
2661 | ||
fef20d9c FW |
2662 | switch (spec.type) { |
2663 | ||
2664 | case FORMAT_TYPE_LONG_LONG: | |
2665 | num = get_arg(long long); | |
2666 | break; | |
2667 | case FORMAT_TYPE_ULONG: | |
fef20d9c FW |
2668 | case FORMAT_TYPE_LONG: |
2669 | num = get_arg(unsigned long); | |
2670 | break; | |
2671 | case FORMAT_TYPE_SIZE_T: | |
2672 | num = get_arg(size_t); | |
2673 | break; | |
2674 | case FORMAT_TYPE_PTRDIFF: | |
2675 | num = get_arg(ptrdiff_t); | |
2676 | break; | |
a4e94ef0 Z |
2677 | case FORMAT_TYPE_UBYTE: |
2678 | num = get_arg(unsigned char); | |
2679 | break; | |
2680 | case FORMAT_TYPE_BYTE: | |
2681 | num = get_arg(signed char); | |
2682 | break; | |
fef20d9c FW |
2683 | case FORMAT_TYPE_USHORT: |
2684 | num = get_arg(unsigned short); | |
2685 | break; | |
2686 | case FORMAT_TYPE_SHORT: | |
2687 | num = get_arg(short); | |
2688 | break; | |
2689 | case FORMAT_TYPE_UINT: | |
2690 | num = get_arg(unsigned int); | |
2691 | break; | |
2692 | default: | |
2693 | num = get_arg(int); | |
2694 | } | |
2695 | ||
2696 | str = number(str, end, num, spec); | |
d4be151b AGR |
2697 | } /* default: */ |
2698 | } /* switch(spec.type) */ | |
2699 | } /* while(*fmt) */ | |
fef20d9c | 2700 | |
b006f19b | 2701 | out: |
4370aa4a LJ |
2702 | if (size > 0) { |
2703 | if (str < end) | |
2704 | *str = '\0'; | |
2705 | else | |
2706 | end[-1] = '\0'; | |
2707 | } | |
fef20d9c | 2708 | |
4370aa4a LJ |
2709 | #undef get_arg |
2710 | ||
2711 | /* the trailing null byte doesn't count towards the total */ | |
2712 | return str - buf; | |
2713 | } | |
2714 | EXPORT_SYMBOL_GPL(bstr_printf); | |
2715 | ||
2716 | /** | |
2717 | * bprintf - Parse a format string and place args' binary value in a buffer | |
2718 | * @bin_buf: The buffer to place args' binary value | |
2719 | * @size: The size of the buffer(by words(32bits), not characters) | |
2720 | * @fmt: The format string to use | |
2721 | * @...: Arguments for the format string | |
2722 | * | |
2723 | * The function returns the number of words(u32) written | |
2724 | * into @bin_buf. | |
2725 | */ | |
2726 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
2727 | { | |
2728 | va_list args; | |
2729 | int ret; | |
2730 | ||
2731 | va_start(args, fmt); | |
2732 | ret = vbin_printf(bin_buf, size, fmt, args); | |
2733 | va_end(args); | |
7b9186f5 | 2734 | |
4370aa4a LJ |
2735 | return ret; |
2736 | } | |
2737 | EXPORT_SYMBOL_GPL(bprintf); | |
2738 | ||
2739 | #endif /* CONFIG_BINARY_PRINTF */ | |
2740 | ||
1da177e4 LT |
2741 | /** |
2742 | * vsscanf - Unformat a buffer into a list of arguments | |
2743 | * @buf: input buffer | |
2744 | * @fmt: format of buffer | |
2745 | * @args: arguments | |
2746 | */ | |
7b9186f5 | 2747 | int vsscanf(const char *buf, const char *fmt, va_list args) |
1da177e4 LT |
2748 | { |
2749 | const char *str = buf; | |
2750 | char *next; | |
2751 | char digit; | |
2752 | int num = 0; | |
ef0658f3 | 2753 | u8 qualifier; |
53809751 JB |
2754 | unsigned int base; |
2755 | union { | |
2756 | long long s; | |
2757 | unsigned long long u; | |
2758 | } val; | |
ef0658f3 | 2759 | s16 field_width; |
d4be151b | 2760 | bool is_sign; |
1da177e4 | 2761 | |
da99075c | 2762 | while (*fmt) { |
1da177e4 LT |
2763 | /* skip any white space in format */ |
2764 | /* white space in format matchs any amount of | |
2765 | * white space, including none, in the input. | |
2766 | */ | |
2767 | if (isspace(*fmt)) { | |
e7d2860b AGR |
2768 | fmt = skip_spaces(++fmt); |
2769 | str = skip_spaces(str); | |
1da177e4 LT |
2770 | } |
2771 | ||
2772 | /* anything that is not a conversion must match exactly */ | |
2773 | if (*fmt != '%' && *fmt) { | |
2774 | if (*fmt++ != *str++) | |
2775 | break; | |
2776 | continue; | |
2777 | } | |
2778 | ||
2779 | if (!*fmt) | |
2780 | break; | |
2781 | ++fmt; | |
7b9186f5 | 2782 | |
1da177e4 LT |
2783 | /* skip this conversion. |
2784 | * advance both strings to next white space | |
2785 | */ | |
2786 | if (*fmt == '*') { | |
da99075c JB |
2787 | if (!*str) |
2788 | break; | |
f9310b2f JY |
2789 | while (!isspace(*fmt) && *fmt != '%' && *fmt) { |
2790 | /* '%*[' not yet supported, invalid format */ | |
2791 | if (*fmt == '[') | |
2792 | return num; | |
1da177e4 | 2793 | fmt++; |
f9310b2f | 2794 | } |
1da177e4 LT |
2795 | while (!isspace(*str) && *str) |
2796 | str++; | |
2797 | continue; | |
2798 | } | |
2799 | ||
2800 | /* get field width */ | |
2801 | field_width = -1; | |
53809751 | 2802 | if (isdigit(*fmt)) { |
1da177e4 | 2803 | field_width = skip_atoi(&fmt); |
53809751 JB |
2804 | if (field_width <= 0) |
2805 | break; | |
2806 | } | |
1da177e4 LT |
2807 | |
2808 | /* get conversion qualifier */ | |
2809 | qualifier = -1; | |
75fb8f26 | 2810 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
5b5e0928 | 2811 | *fmt == 'z') { |
1da177e4 LT |
2812 | qualifier = *fmt++; |
2813 | if (unlikely(qualifier == *fmt)) { | |
2814 | if (qualifier == 'h') { | |
2815 | qualifier = 'H'; | |
2816 | fmt++; | |
2817 | } else if (qualifier == 'l') { | |
2818 | qualifier = 'L'; | |
2819 | fmt++; | |
2820 | } | |
2821 | } | |
2822 | } | |
1da177e4 | 2823 | |
da99075c JB |
2824 | if (!*fmt) |
2825 | break; | |
2826 | ||
2827 | if (*fmt == 'n') { | |
2828 | /* return number of characters read so far */ | |
2829 | *va_arg(args, int *) = str - buf; | |
2830 | ++fmt; | |
2831 | continue; | |
2832 | } | |
2833 | ||
2834 | if (!*str) | |
1da177e4 LT |
2835 | break; |
2836 | ||
d4be151b | 2837 | base = 10; |
3f623eba | 2838 | is_sign = false; |
d4be151b | 2839 | |
7b9186f5 | 2840 | switch (*fmt++) { |
1da177e4 LT |
2841 | case 'c': |
2842 | { | |
7b9186f5 | 2843 | char *s = (char *)va_arg(args, char*); |
1da177e4 LT |
2844 | if (field_width == -1) |
2845 | field_width = 1; | |
2846 | do { | |
2847 | *s++ = *str++; | |
2848 | } while (--field_width > 0 && *str); | |
2849 | num++; | |
2850 | } | |
2851 | continue; | |
2852 | case 's': | |
2853 | { | |
7b9186f5 AGR |
2854 | char *s = (char *)va_arg(args, char *); |
2855 | if (field_width == -1) | |
4be929be | 2856 | field_width = SHRT_MAX; |
1da177e4 | 2857 | /* first, skip leading white space in buffer */ |
e7d2860b | 2858 | str = skip_spaces(str); |
1da177e4 LT |
2859 | |
2860 | /* now copy until next white space */ | |
7b9186f5 | 2861 | while (*str && !isspace(*str) && field_width--) |
1da177e4 | 2862 | *s++ = *str++; |
1da177e4 LT |
2863 | *s = '\0'; |
2864 | num++; | |
2865 | } | |
2866 | continue; | |
f9310b2f JY |
2867 | /* |
2868 | * Warning: This implementation of the '[' conversion specifier | |
2869 | * deviates from its glibc counterpart in the following ways: | |
2870 | * (1) It does NOT support ranges i.e. '-' is NOT a special | |
2871 | * character | |
2872 | * (2) It cannot match the closing bracket ']' itself | |
2873 | * (3) A field width is required | |
2874 | * (4) '%*[' (discard matching input) is currently not supported | |
2875 | * | |
2876 | * Example usage: | |
2877 | * ret = sscanf("00:0a:95","%2[^:]:%2[^:]:%2[^:]", | |
2878 | * buf1, buf2, buf3); | |
2879 | * if (ret < 3) | |
2880 | * // etc.. | |
2881 | */ | |
2882 | case '[': | |
2883 | { | |
2884 | char *s = (char *)va_arg(args, char *); | |
2885 | DECLARE_BITMAP(set, 256) = {0}; | |
2886 | unsigned int len = 0; | |
2887 | bool negate = (*fmt == '^'); | |
2888 | ||
2889 | /* field width is required */ | |
2890 | if (field_width == -1) | |
2891 | return num; | |
2892 | ||
2893 | if (negate) | |
2894 | ++fmt; | |
2895 | ||
2896 | for ( ; *fmt && *fmt != ']'; ++fmt, ++len) | |
2897 | set_bit((u8)*fmt, set); | |
2898 | ||
2899 | /* no ']' or no character set found */ | |
2900 | if (!*fmt || !len) | |
2901 | return num; | |
2902 | ++fmt; | |
2903 | ||
2904 | if (negate) { | |
2905 | bitmap_complement(set, set, 256); | |
2906 | /* exclude null '\0' byte */ | |
2907 | clear_bit(0, set); | |
2908 | } | |
2909 | ||
2910 | /* match must be non-empty */ | |
2911 | if (!test_bit((u8)*str, set)) | |
2912 | return num; | |
2913 | ||
2914 | while (test_bit((u8)*str, set) && field_width--) | |
2915 | *s++ = *str++; | |
2916 | *s = '\0'; | |
2917 | ++num; | |
2918 | } | |
2919 | continue; | |
1da177e4 LT |
2920 | case 'o': |
2921 | base = 8; | |
2922 | break; | |
2923 | case 'x': | |
2924 | case 'X': | |
2925 | base = 16; | |
2926 | break; | |
2927 | case 'i': | |
7b9186f5 | 2928 | base = 0; |
1da177e4 | 2929 | case 'd': |
3f623eba | 2930 | is_sign = true; |
1da177e4 LT |
2931 | case 'u': |
2932 | break; | |
2933 | case '%': | |
2934 | /* looking for '%' in str */ | |
7b9186f5 | 2935 | if (*str++ != '%') |
1da177e4 LT |
2936 | return num; |
2937 | continue; | |
2938 | default: | |
2939 | /* invalid format; stop here */ | |
2940 | return num; | |
2941 | } | |
2942 | ||
2943 | /* have some sort of integer conversion. | |
2944 | * first, skip white space in buffer. | |
2945 | */ | |
e7d2860b | 2946 | str = skip_spaces(str); |
1da177e4 LT |
2947 | |
2948 | digit = *str; | |
2949 | if (is_sign && digit == '-') | |
2950 | digit = *(str + 1); | |
2951 | ||
2952 | if (!digit | |
7b9186f5 AGR |
2953 | || (base == 16 && !isxdigit(digit)) |
2954 | || (base == 10 && !isdigit(digit)) | |
2955 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
2956 | || (base == 0 && !isdigit(digit))) | |
2957 | break; | |
1da177e4 | 2958 | |
53809751 JB |
2959 | if (is_sign) |
2960 | val.s = qualifier != 'L' ? | |
2961 | simple_strtol(str, &next, base) : | |
2962 | simple_strtoll(str, &next, base); | |
2963 | else | |
2964 | val.u = qualifier != 'L' ? | |
2965 | simple_strtoul(str, &next, base) : | |
2966 | simple_strtoull(str, &next, base); | |
2967 | ||
2968 | if (field_width > 0 && next - str > field_width) { | |
2969 | if (base == 0) | |
2970 | _parse_integer_fixup_radix(str, &base); | |
2971 | while (next - str > field_width) { | |
2972 | if (is_sign) | |
2973 | val.s = div_s64(val.s, base); | |
2974 | else | |
2975 | val.u = div_u64(val.u, base); | |
2976 | --next; | |
2977 | } | |
2978 | } | |
2979 | ||
7b9186f5 | 2980 | switch (qualifier) { |
1da177e4 | 2981 | case 'H': /* that's 'hh' in format */ |
53809751 JB |
2982 | if (is_sign) |
2983 | *va_arg(args, signed char *) = val.s; | |
2984 | else | |
2985 | *va_arg(args, unsigned char *) = val.u; | |
1da177e4 LT |
2986 | break; |
2987 | case 'h': | |
53809751 JB |
2988 | if (is_sign) |
2989 | *va_arg(args, short *) = val.s; | |
2990 | else | |
2991 | *va_arg(args, unsigned short *) = val.u; | |
1da177e4 LT |
2992 | break; |
2993 | case 'l': | |
53809751 JB |
2994 | if (is_sign) |
2995 | *va_arg(args, long *) = val.s; | |
2996 | else | |
2997 | *va_arg(args, unsigned long *) = val.u; | |
1da177e4 LT |
2998 | break; |
2999 | case 'L': | |
53809751 JB |
3000 | if (is_sign) |
3001 | *va_arg(args, long long *) = val.s; | |
3002 | else | |
3003 | *va_arg(args, unsigned long long *) = val.u; | |
1da177e4 | 3004 | break; |
1da177e4 | 3005 | case 'z': |
53809751 JB |
3006 | *va_arg(args, size_t *) = val.u; |
3007 | break; | |
1da177e4 | 3008 | default: |
53809751 JB |
3009 | if (is_sign) |
3010 | *va_arg(args, int *) = val.s; | |
3011 | else | |
3012 | *va_arg(args, unsigned int *) = val.u; | |
1da177e4 LT |
3013 | break; |
3014 | } | |
3015 | num++; | |
3016 | ||
3017 | if (!next) | |
3018 | break; | |
3019 | str = next; | |
3020 | } | |
c6b40d16 | 3021 | |
1da177e4 LT |
3022 | return num; |
3023 | } | |
1da177e4 LT |
3024 | EXPORT_SYMBOL(vsscanf); |
3025 | ||
3026 | /** | |
3027 | * sscanf - Unformat a buffer into a list of arguments | |
3028 | * @buf: input buffer | |
3029 | * @fmt: formatting of buffer | |
3030 | * @...: resulting arguments | |
3031 | */ | |
7b9186f5 | 3032 | int sscanf(const char *buf, const char *fmt, ...) |
1da177e4 LT |
3033 | { |
3034 | va_list args; | |
3035 | int i; | |
3036 | ||
7b9186f5 AGR |
3037 | va_start(args, fmt); |
3038 | i = vsscanf(buf, fmt, args); | |
1da177e4 | 3039 | va_end(args); |
7b9186f5 | 3040 | |
1da177e4 LT |
3041 | return i; |
3042 | } | |
1da177e4 | 3043 | EXPORT_SYMBOL(sscanf); |