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> | |
8bc3bcc9 | 20 | #include <linux/module.h> /* for KSYM_SYMBOL_LEN */ |
1da177e4 LT |
21 | #include <linux/types.h> |
22 | #include <linux/string.h> | |
23 | #include <linux/ctype.h> | |
24 | #include <linux/kernel.h> | |
0fe1ef24 | 25 | #include <linux/kallsyms.h> |
53809751 | 26 | #include <linux/math64.h> |
0fe1ef24 | 27 | #include <linux/uaccess.h> |
332d2e78 | 28 | #include <linux/ioport.h> |
4b6ccca7 | 29 | #include <linux/dcache.h> |
312b4e22 | 30 | #include <linux/cred.h> |
8a27f7c9 | 31 | #include <net/addrconf.h> |
1da177e4 | 32 | |
4e57b681 | 33 | #include <asm/page.h> /* for PAGE_SIZE */ |
deac93df | 34 | #include <asm/sections.h> /* for dereference_function_descriptor() */ |
1da177e4 | 35 | |
71dca95d | 36 | #include <linux/string_helpers.h> |
1dff46d6 | 37 | #include "kstrtox.h" |
aa46a63e | 38 | |
1da177e4 | 39 | /** |
922ac25c | 40 | * simple_strtoull - convert a string to an unsigned long long |
1da177e4 LT |
41 | * @cp: The start of the string |
42 | * @endp: A pointer to the end of the parsed string will be placed here | |
43 | * @base: The number base to use | |
462e4711 EZ |
44 | * |
45 | * This function is obsolete. Please use kstrtoull instead. | |
1da177e4 | 46 | */ |
922ac25c | 47 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
1da177e4 | 48 | { |
1dff46d6 AD |
49 | unsigned long long result; |
50 | unsigned int rv; | |
aa46a63e | 51 | |
1dff46d6 AD |
52 | cp = _parse_integer_fixup_radix(cp, &base); |
53 | rv = _parse_integer(cp, base, &result); | |
54 | /* FIXME */ | |
55 | cp += (rv & ~KSTRTOX_OVERFLOW); | |
aa46a63e | 56 | |
1da177e4 LT |
57 | if (endp) |
58 | *endp = (char *)cp; | |
7b9186f5 | 59 | |
1da177e4 LT |
60 | return result; |
61 | } | |
922ac25c | 62 | EXPORT_SYMBOL(simple_strtoull); |
1da177e4 LT |
63 | |
64 | /** | |
922ac25c | 65 | * simple_strtoul - convert a string to an unsigned long |
1da177e4 LT |
66 | * @cp: The start of the string |
67 | * @endp: A pointer to the end of the parsed string will be placed here | |
68 | * @base: The number base to use | |
462e4711 EZ |
69 | * |
70 | * This function is obsolete. Please use kstrtoul instead. | |
1da177e4 | 71 | */ |
922ac25c | 72 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
1da177e4 | 73 | { |
922ac25c | 74 | return simple_strtoull(cp, endp, base); |
1da177e4 | 75 | } |
922ac25c | 76 | EXPORT_SYMBOL(simple_strtoul); |
1da177e4 LT |
77 | |
78 | /** | |
922ac25c | 79 | * simple_strtol - convert a string to a signed long |
1da177e4 LT |
80 | * @cp: The start of the string |
81 | * @endp: A pointer to the end of the parsed string will be placed here | |
82 | * @base: The number base to use | |
462e4711 EZ |
83 | * |
84 | * This function is obsolete. Please use kstrtol instead. | |
1da177e4 | 85 | */ |
922ac25c | 86 | long simple_strtol(const char *cp, char **endp, unsigned int base) |
1da177e4 | 87 | { |
922ac25c AGR |
88 | if (*cp == '-') |
89 | return -simple_strtoul(cp + 1, endp, base); | |
7b9186f5 | 90 | |
922ac25c | 91 | return simple_strtoul(cp, endp, base); |
1da177e4 | 92 | } |
922ac25c | 93 | EXPORT_SYMBOL(simple_strtol); |
1da177e4 LT |
94 | |
95 | /** | |
96 | * simple_strtoll - convert a string to a signed long long | |
97 | * @cp: The start of the string | |
98 | * @endp: A pointer to the end of the parsed string will be placed here | |
99 | * @base: The number base to use | |
462e4711 EZ |
100 | * |
101 | * This function is obsolete. Please use kstrtoll instead. | |
1da177e4 | 102 | */ |
22d27051 | 103 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
1da177e4 | 104 | { |
7b9186f5 | 105 | if (*cp == '-') |
22d27051 | 106 | return -simple_strtoull(cp + 1, endp, base); |
7b9186f5 | 107 | |
22d27051 | 108 | return simple_strtoull(cp, endp, base); |
1da177e4 | 109 | } |
98d5ce0d | 110 | EXPORT_SYMBOL(simple_strtoll); |
1da177e4 | 111 | |
cf3b429b JP |
112 | static noinline_for_stack |
113 | int skip_atoi(const char **s) | |
1da177e4 | 114 | { |
7b9186f5 | 115 | int i = 0; |
1da177e4 | 116 | |
43e5b666 | 117 | do { |
1da177e4 | 118 | i = i*10 + *((*s)++) - '0'; |
43e5b666 | 119 | } while (isdigit(**s)); |
7b9186f5 | 120 | |
1da177e4 LT |
121 | return i; |
122 | } | |
123 | ||
4277eedd DV |
124 | /* Decimal conversion is by far the most typical, and is used |
125 | * for /proc and /sys data. This directly impacts e.g. top performance | |
126 | * with many processes running. We optimize it for speed | |
133fd9f5 DV |
127 | * using ideas described at <http://www.cs.uiowa.edu/~jones/bcd/divide.html> |
128 | * (with permission from the author, Douglas W. Jones). | |
129 | */ | |
4277eedd | 130 | |
133fd9f5 DV |
131 | #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64 |
132 | /* Formats correctly any integer in [0, 999999999] */ | |
cf3b429b | 133 | static noinline_for_stack |
133fd9f5 | 134 | char *put_dec_full9(char *buf, unsigned q) |
4277eedd | 135 | { |
133fd9f5 | 136 | unsigned r; |
7b9186f5 | 137 | |
133fd9f5 DV |
138 | /* |
139 | * Possible ways to approx. divide by 10 | |
140 | * (x * 0x1999999a) >> 32 x < 1073741829 (multiply must be 64-bit) | |
141 | * (x * 0xcccd) >> 19 x < 81920 (x < 262149 when 64-bit mul) | |
142 | * (x * 0x6667) >> 18 x < 43699 | |
143 | * (x * 0x3334) >> 17 x < 16389 | |
144 | * (x * 0x199a) >> 16 x < 16389 | |
145 | * (x * 0x0ccd) >> 15 x < 16389 | |
146 | * (x * 0x0667) >> 14 x < 2739 | |
147 | * (x * 0x0334) >> 13 x < 1029 | |
148 | * (x * 0x019a) >> 12 x < 1029 | |
149 | * (x * 0x00cd) >> 11 x < 1029 shorter code than * 0x67 (on i386) | |
150 | * (x * 0x0067) >> 10 x < 179 | |
151 | * (x * 0x0034) >> 9 x < 69 same | |
152 | * (x * 0x001a) >> 8 x < 69 same | |
153 | * (x * 0x000d) >> 7 x < 69 same, shortest code (on i386) | |
154 | * (x * 0x0007) >> 6 x < 19 | |
155 | * See <http://www.cs.uiowa.edu/~jones/bcd/divide.html> | |
156 | */ | |
157 | r = (q * (uint64_t)0x1999999a) >> 32; | |
158 | *buf++ = (q - 10 * r) + '0'; /* 1 */ | |
159 | q = (r * (uint64_t)0x1999999a) >> 32; | |
160 | *buf++ = (r - 10 * q) + '0'; /* 2 */ | |
161 | r = (q * (uint64_t)0x1999999a) >> 32; | |
162 | *buf++ = (q - 10 * r) + '0'; /* 3 */ | |
163 | q = (r * (uint64_t)0x1999999a) >> 32; | |
164 | *buf++ = (r - 10 * q) + '0'; /* 4 */ | |
165 | r = (q * (uint64_t)0x1999999a) >> 32; | |
166 | *buf++ = (q - 10 * r) + '0'; /* 5 */ | |
167 | /* Now value is under 10000, can avoid 64-bit multiply */ | |
168 | q = (r * 0x199a) >> 16; | |
169 | *buf++ = (r - 10 * q) + '0'; /* 6 */ | |
170 | r = (q * 0xcd) >> 11; | |
171 | *buf++ = (q - 10 * r) + '0'; /* 7 */ | |
172 | q = (r * 0xcd) >> 11; | |
173 | *buf++ = (r - 10 * q) + '0'; /* 8 */ | |
174 | *buf++ = q + '0'; /* 9 */ | |
4277eedd DV |
175 | return buf; |
176 | } | |
133fd9f5 DV |
177 | #endif |
178 | ||
179 | /* Similar to above but do not pad with zeros. | |
180 | * Code can be easily arranged to print 9 digits too, but our callers | |
181 | * always call put_dec_full9() instead when the number has 9 decimal digits. | |
182 | */ | |
cf3b429b | 183 | static noinline_for_stack |
133fd9f5 | 184 | char *put_dec_trunc8(char *buf, unsigned r) |
4277eedd | 185 | { |
133fd9f5 DV |
186 | unsigned q; |
187 | ||
188 | /* Copy of previous function's body with added early returns */ | |
cb239d0a GS |
189 | while (r >= 10000) { |
190 | q = r + '0'; | |
191 | r = (r * (uint64_t)0x1999999a) >> 32; | |
192 | *buf++ = q - 10*r; | |
193 | } | |
194 | ||
f4000516 GS |
195 | q = (r * 0x199a) >> 16; /* r <= 9999 */ |
196 | *buf++ = (r - 10 * q) + '0'; | |
133fd9f5 DV |
197 | if (q == 0) |
198 | return buf; | |
f4000516 GS |
199 | r = (q * 0xcd) >> 11; /* q <= 999 */ |
200 | *buf++ = (q - 10 * r) + '0'; | |
133fd9f5 DV |
201 | if (r == 0) |
202 | return buf; | |
f4000516 GS |
203 | q = (r * 0xcd) >> 11; /* r <= 99 */ |
204 | *buf++ = (r - 10 * q) + '0'; | |
133fd9f5 DV |
205 | if (q == 0) |
206 | return buf; | |
f4000516 | 207 | *buf++ = q + '0'; /* q <= 9 */ |
133fd9f5 DV |
208 | return buf; |
209 | } | |
4277eedd | 210 | |
133fd9f5 DV |
211 | /* There are two algorithms to print larger numbers. |
212 | * One is generic: divide by 1000000000 and repeatedly print | |
213 | * groups of (up to) 9 digits. It's conceptually simple, | |
214 | * but requires a (unsigned long long) / 1000000000 division. | |
215 | * | |
216 | * Second algorithm splits 64-bit unsigned long long into 16-bit chunks, | |
217 | * manipulates them cleverly and generates groups of 4 decimal digits. | |
218 | * It so happens that it does NOT require long long division. | |
219 | * | |
220 | * If long is > 32 bits, division of 64-bit values is relatively easy, | |
221 | * and we will use the first algorithm. | |
222 | * If long long is > 64 bits (strange architecture with VERY large long long), | |
223 | * second algorithm can't be used, and we again use the first one. | |
224 | * | |
225 | * Else (if long is 32 bits and long long is 64 bits) we use second one. | |
226 | */ | |
7b9186f5 | 227 | |
133fd9f5 DV |
228 | #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64 |
229 | ||
230 | /* First algorithm: generic */ | |
231 | ||
232 | static | |
233 | char *put_dec(char *buf, unsigned long long n) | |
234 | { | |
235 | if (n >= 100*1000*1000) { | |
236 | while (n >= 1000*1000*1000) | |
237 | buf = put_dec_full9(buf, do_div(n, 1000*1000*1000)); | |
238 | if (n >= 100*1000*1000) | |
239 | return put_dec_full9(buf, n); | |
240 | } | |
241 | return put_dec_trunc8(buf, n); | |
4277eedd | 242 | } |
133fd9f5 DV |
243 | |
244 | #else | |
245 | ||
246 | /* Second algorithm: valid only for 64-bit long longs */ | |
247 | ||
e49317d4 | 248 | /* See comment in put_dec_full9 for choice of constants */ |
cf3b429b | 249 | static noinline_for_stack |
2359172a | 250 | void put_dec_full4(char *buf, unsigned q) |
4277eedd | 251 | { |
133fd9f5 | 252 | unsigned r; |
e49317d4 | 253 | r = (q * 0xccd) >> 15; |
2359172a | 254 | buf[0] = (q - 10 * r) + '0'; |
e49317d4 | 255 | q = (r * 0xcd) >> 11; |
2359172a | 256 | buf[1] = (r - 10 * q) + '0'; |
133fd9f5 | 257 | r = (q * 0xcd) >> 11; |
2359172a GS |
258 | buf[2] = (q - 10 * r) + '0'; |
259 | buf[3] = r + '0'; | |
260 | } | |
261 | ||
262 | /* | |
263 | * Call put_dec_full4 on x % 10000, return x / 10000. | |
264 | * The approximation x/10000 == (x * 0x346DC5D7) >> 43 | |
265 | * holds for all x < 1,128,869,999. The largest value this | |
266 | * helper will ever be asked to convert is 1,125,520,955. | |
267 | * (d1 in the put_dec code, assuming n is all-ones). | |
268 | */ | |
269 | static | |
270 | unsigned put_dec_helper4(char *buf, unsigned x) | |
271 | { | |
272 | uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43; | |
273 | ||
274 | put_dec_full4(buf, x - q * 10000); | |
275 | return q; | |
4277eedd DV |
276 | } |
277 | ||
133fd9f5 DV |
278 | /* Based on code by Douglas W. Jones found at |
279 | * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour> | |
280 | * (with permission from the author). | |
281 | * Performs no 64-bit division and hence should be fast on 32-bit machines. | |
282 | */ | |
283 | static | |
284 | char *put_dec(char *buf, unsigned long long n) | |
285 | { | |
286 | uint32_t d3, d2, d1, q, h; | |
287 | ||
288 | if (n < 100*1000*1000) | |
289 | return put_dec_trunc8(buf, n); | |
290 | ||
291 | d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */ | |
292 | h = (n >> 32); | |
293 | d2 = (h ) & 0xffff; | |
294 | d3 = (h >> 16); /* implicit "& 0xffff" */ | |
295 | ||
296 | q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff); | |
2359172a GS |
297 | q = put_dec_helper4(buf, q); |
298 | ||
299 | q += 7671 * d3 + 9496 * d2 + 6 * d1; | |
300 | q = put_dec_helper4(buf+4, q); | |
301 | ||
302 | q += 4749 * d3 + 42 * d2; | |
303 | q = put_dec_helper4(buf+8, q); | |
133fd9f5 | 304 | |
2359172a GS |
305 | q += 281 * d3; |
306 | buf += 12; | |
307 | if (q) | |
308 | buf = put_dec_trunc8(buf, q); | |
309 | else while (buf[-1] == '0') | |
133fd9f5 DV |
310 | --buf; |
311 | ||
312 | return buf; | |
313 | } | |
314 | ||
315 | #endif | |
316 | ||
1ac101a5 KH |
317 | /* |
318 | * Convert passed number to decimal string. | |
319 | * Returns the length of string. On buffer overflow, returns 0. | |
320 | * | |
321 | * If speed is not important, use snprintf(). It's easy to read the code. | |
322 | */ | |
323 | int num_to_str(char *buf, int size, unsigned long long num) | |
324 | { | |
133fd9f5 | 325 | char tmp[sizeof(num) * 3]; |
1ac101a5 KH |
326 | int idx, len; |
327 | ||
133fd9f5 DV |
328 | /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */ |
329 | if (num <= 9) { | |
330 | tmp[0] = '0' + num; | |
331 | len = 1; | |
332 | } else { | |
333 | len = put_dec(tmp, num) - tmp; | |
334 | } | |
1ac101a5 KH |
335 | |
336 | if (len > size) | |
337 | return 0; | |
338 | for (idx = 0; idx < len; ++idx) | |
339 | buf[idx] = tmp[len - idx - 1]; | |
133fd9f5 | 340 | return len; |
1ac101a5 KH |
341 | } |
342 | ||
51be17df | 343 | #define SIGN 1 /* unsigned/signed, must be 1 */ |
d1c1b121 | 344 | #define LEFT 2 /* left justified */ |
1da177e4 LT |
345 | #define PLUS 4 /* show plus */ |
346 | #define SPACE 8 /* space if plus */ | |
d1c1b121 | 347 | #define ZEROPAD 16 /* pad with zero, must be 16 == '0' - ' ' */ |
b89dc5d6 BH |
348 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ |
349 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ | |
1da177e4 | 350 | |
fef20d9c FW |
351 | enum format_type { |
352 | FORMAT_TYPE_NONE, /* Just a string part */ | |
ed681a91 | 353 | FORMAT_TYPE_WIDTH, |
fef20d9c FW |
354 | FORMAT_TYPE_PRECISION, |
355 | FORMAT_TYPE_CHAR, | |
356 | FORMAT_TYPE_STR, | |
357 | FORMAT_TYPE_PTR, | |
358 | FORMAT_TYPE_PERCENT_CHAR, | |
359 | FORMAT_TYPE_INVALID, | |
360 | FORMAT_TYPE_LONG_LONG, | |
361 | FORMAT_TYPE_ULONG, | |
362 | FORMAT_TYPE_LONG, | |
a4e94ef0 Z |
363 | FORMAT_TYPE_UBYTE, |
364 | FORMAT_TYPE_BYTE, | |
fef20d9c FW |
365 | FORMAT_TYPE_USHORT, |
366 | FORMAT_TYPE_SHORT, | |
367 | FORMAT_TYPE_UINT, | |
368 | FORMAT_TYPE_INT, | |
fef20d9c FW |
369 | FORMAT_TYPE_SIZE_T, |
370 | FORMAT_TYPE_PTRDIFF | |
371 | }; | |
372 | ||
373 | struct printf_spec { | |
4e310fda | 374 | u8 type; /* format_type enum */ |
ef0658f3 | 375 | u8 flags; /* flags to number() */ |
4e310fda JP |
376 | u8 base; /* number base, 8, 10 or 16 only */ |
377 | u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */ | |
378 | s16 field_width; /* width of output field */ | |
379 | s16 precision; /* # of digits/chars */ | |
fef20d9c FW |
380 | }; |
381 | ||
cf3b429b JP |
382 | static noinline_for_stack |
383 | char *number(char *buf, char *end, unsigned long long num, | |
384 | struct printf_spec spec) | |
1da177e4 | 385 | { |
e26c12c7 | 386 | char tmp[3 * sizeof(num)]; |
9b706aee DV |
387 | char sign; |
388 | char locase; | |
fef20d9c | 389 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
1da177e4 | 390 | int i; |
7c203422 | 391 | bool is_zero = num == 0LL; |
1da177e4 | 392 | |
9b706aee DV |
393 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
394 | * produces same digits or (maybe lowercased) letters */ | |
fef20d9c FW |
395 | locase = (spec.flags & SMALL); |
396 | if (spec.flags & LEFT) | |
397 | spec.flags &= ~ZEROPAD; | |
1da177e4 | 398 | sign = 0; |
fef20d9c | 399 | if (spec.flags & SIGN) { |
7b9186f5 | 400 | if ((signed long long)num < 0) { |
1da177e4 | 401 | sign = '-'; |
7b9186f5 | 402 | num = -(signed long long)num; |
fef20d9c FW |
403 | spec.field_width--; |
404 | } else if (spec.flags & PLUS) { | |
1da177e4 | 405 | sign = '+'; |
fef20d9c FW |
406 | spec.field_width--; |
407 | } else if (spec.flags & SPACE) { | |
1da177e4 | 408 | sign = ' '; |
fef20d9c | 409 | spec.field_width--; |
1da177e4 LT |
410 | } |
411 | } | |
b39a7340 | 412 | if (need_pfx) { |
fef20d9c | 413 | if (spec.base == 16) |
7c203422 PC |
414 | spec.field_width -= 2; |
415 | else if (!is_zero) | |
fef20d9c | 416 | spec.field_width--; |
1da177e4 | 417 | } |
b39a7340 DV |
418 | |
419 | /* generate full string in tmp[], in reverse order */ | |
1da177e4 | 420 | i = 0; |
133fd9f5 | 421 | if (num < spec.base) |
3ea8d440 | 422 | tmp[i++] = hex_asc_upper[num] | locase; |
fef20d9c FW |
423 | else if (spec.base != 10) { /* 8 or 16 */ |
424 | int mask = spec.base - 1; | |
b39a7340 | 425 | int shift = 3; |
7b9186f5 AGR |
426 | |
427 | if (spec.base == 16) | |
428 | shift = 4; | |
b39a7340 | 429 | do { |
3ea8d440 | 430 | tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase); |
b39a7340 DV |
431 | num >>= shift; |
432 | } while (num); | |
4277eedd DV |
433 | } else { /* base 10 */ |
434 | i = put_dec(tmp, num) - tmp; | |
435 | } | |
b39a7340 DV |
436 | |
437 | /* printing 100 using %2d gives "100", not "00" */ | |
fef20d9c FW |
438 | if (i > spec.precision) |
439 | spec.precision = i; | |
b39a7340 | 440 | /* leading space padding */ |
fef20d9c | 441 | spec.field_width -= spec.precision; |
51be17df | 442 | if (!(spec.flags & (ZEROPAD | LEFT))) { |
7b9186f5 | 443 | while (--spec.field_width >= 0) { |
f796937a | 444 | if (buf < end) |
1da177e4 LT |
445 | *buf = ' '; |
446 | ++buf; | |
447 | } | |
448 | } | |
b39a7340 | 449 | /* sign */ |
1da177e4 | 450 | if (sign) { |
f796937a | 451 | if (buf < end) |
1da177e4 LT |
452 | *buf = sign; |
453 | ++buf; | |
454 | } | |
b39a7340 DV |
455 | /* "0x" / "0" prefix */ |
456 | if (need_pfx) { | |
7c203422 PC |
457 | if (spec.base == 16 || !is_zero) { |
458 | if (buf < end) | |
459 | *buf = '0'; | |
460 | ++buf; | |
461 | } | |
fef20d9c | 462 | if (spec.base == 16) { |
f796937a | 463 | if (buf < end) |
9b706aee | 464 | *buf = ('X' | locase); |
1da177e4 LT |
465 | ++buf; |
466 | } | |
467 | } | |
b39a7340 | 468 | /* zero or space padding */ |
fef20d9c | 469 | if (!(spec.flags & LEFT)) { |
d1c1b121 RV |
470 | char c = ' ' + (spec.flags & ZEROPAD); |
471 | BUILD_BUG_ON(' ' + ZEROPAD != '0'); | |
fef20d9c | 472 | while (--spec.field_width >= 0) { |
f796937a | 473 | if (buf < end) |
1da177e4 LT |
474 | *buf = c; |
475 | ++buf; | |
476 | } | |
477 | } | |
b39a7340 | 478 | /* hmm even more zero padding? */ |
fef20d9c | 479 | while (i <= --spec.precision) { |
f796937a | 480 | if (buf < end) |
1da177e4 LT |
481 | *buf = '0'; |
482 | ++buf; | |
483 | } | |
b39a7340 DV |
484 | /* actual digits of result */ |
485 | while (--i >= 0) { | |
f796937a | 486 | if (buf < end) |
1da177e4 LT |
487 | *buf = tmp[i]; |
488 | ++buf; | |
489 | } | |
b39a7340 | 490 | /* trailing space padding */ |
fef20d9c | 491 | while (--spec.field_width >= 0) { |
f796937a | 492 | if (buf < end) |
1da177e4 LT |
493 | *buf = ' '; |
494 | ++buf; | |
495 | } | |
7b9186f5 | 496 | |
1da177e4 LT |
497 | return buf; |
498 | } | |
499 | ||
cf3b429b JP |
500 | static noinline_for_stack |
501 | char *string(char *buf, char *end, const char *s, struct printf_spec spec) | |
0f9bfa56 LT |
502 | { |
503 | int len, i; | |
504 | ||
505 | if ((unsigned long)s < PAGE_SIZE) | |
0f4f81dc | 506 | s = "(null)"; |
0f9bfa56 | 507 | |
fef20d9c | 508 | len = strnlen(s, spec.precision); |
0f9bfa56 | 509 | |
fef20d9c FW |
510 | if (!(spec.flags & LEFT)) { |
511 | while (len < spec.field_width--) { | |
0f9bfa56 LT |
512 | if (buf < end) |
513 | *buf = ' '; | |
514 | ++buf; | |
515 | } | |
516 | } | |
517 | for (i = 0; i < len; ++i) { | |
518 | if (buf < end) | |
519 | *buf = *s; | |
520 | ++buf; ++s; | |
521 | } | |
fef20d9c | 522 | while (len < spec.field_width--) { |
0f9bfa56 LT |
523 | if (buf < end) |
524 | *buf = ' '; | |
525 | ++buf; | |
526 | } | |
7b9186f5 | 527 | |
0f9bfa56 LT |
528 | return buf; |
529 | } | |
530 | ||
4b6ccca7 AV |
531 | static void widen(char *buf, char *end, unsigned len, unsigned spaces) |
532 | { | |
533 | size_t size; | |
534 | if (buf >= end) /* nowhere to put anything */ | |
535 | return; | |
536 | size = end - buf; | |
537 | if (size <= spaces) { | |
538 | memset(buf, ' ', size); | |
539 | return; | |
540 | } | |
541 | if (len) { | |
542 | if (len > size - spaces) | |
543 | len = size - spaces; | |
544 | memmove(buf + spaces, buf, len); | |
545 | } | |
546 | memset(buf, ' ', spaces); | |
547 | } | |
548 | ||
549 | static noinline_for_stack | |
550 | char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec, | |
551 | const char *fmt) | |
552 | { | |
553 | const char *array[4], *s; | |
554 | const struct dentry *p; | |
555 | int depth; | |
556 | int i, n; | |
557 | ||
558 | switch (fmt[1]) { | |
559 | case '2': case '3': case '4': | |
560 | depth = fmt[1] - '0'; | |
561 | break; | |
562 | default: | |
563 | depth = 1; | |
564 | } | |
565 | ||
566 | rcu_read_lock(); | |
567 | for (i = 0; i < depth; i++, d = p) { | |
568 | p = ACCESS_ONCE(d->d_parent); | |
569 | array[i] = ACCESS_ONCE(d->d_name.name); | |
570 | if (p == d) { | |
571 | if (i) | |
572 | array[i] = ""; | |
573 | i++; | |
574 | break; | |
575 | } | |
576 | } | |
577 | s = array[--i]; | |
578 | for (n = 0; n != spec.precision; n++, buf++) { | |
579 | char c = *s++; | |
580 | if (!c) { | |
581 | if (!i) | |
582 | break; | |
583 | c = '/'; | |
584 | s = array[--i]; | |
585 | } | |
586 | if (buf < end) | |
587 | *buf = c; | |
588 | } | |
589 | rcu_read_unlock(); | |
590 | if (n < spec.field_width) { | |
591 | /* we want to pad the sucker */ | |
592 | unsigned spaces = spec.field_width - n; | |
593 | if (!(spec.flags & LEFT)) { | |
594 | widen(buf - n, end, n, spaces); | |
595 | return buf + spaces; | |
596 | } | |
597 | while (spaces--) { | |
598 | if (buf < end) | |
599 | *buf = ' '; | |
600 | ++buf; | |
601 | } | |
602 | } | |
603 | return buf; | |
604 | } | |
605 | ||
cf3b429b JP |
606 | static noinline_for_stack |
607 | char *symbol_string(char *buf, char *end, void *ptr, | |
b0d33c2b | 608 | struct printf_spec spec, const char *fmt) |
0fe1ef24 | 609 | { |
b0d33c2b | 610 | unsigned long value; |
0fe1ef24 LT |
611 | #ifdef CONFIG_KALLSYMS |
612 | char sym[KSYM_SYMBOL_LEN]; | |
b0d33c2b JP |
613 | #endif |
614 | ||
615 | if (fmt[1] == 'R') | |
616 | ptr = __builtin_extract_return_addr(ptr); | |
617 | value = (unsigned long)ptr; | |
618 | ||
619 | #ifdef CONFIG_KALLSYMS | |
620 | if (*fmt == 'B') | |
0f77a8d3 | 621 | sprint_backtrace(sym, value); |
b0d33c2b | 622 | else if (*fmt != 'f' && *fmt != 's') |
0c8b946e FW |
623 | sprint_symbol(sym, value); |
624 | else | |
4796dd20 | 625 | sprint_symbol_no_offset(sym, value); |
7b9186f5 | 626 | |
fef20d9c | 627 | return string(buf, end, sym, spec); |
0fe1ef24 | 628 | #else |
7b9186f5 | 629 | spec.field_width = 2 * sizeof(void *); |
fef20d9c FW |
630 | spec.flags |= SPECIAL | SMALL | ZEROPAD; |
631 | spec.base = 16; | |
7b9186f5 | 632 | |
fef20d9c | 633 | return number(buf, end, value, spec); |
0fe1ef24 LT |
634 | #endif |
635 | } | |
636 | ||
cf3b429b JP |
637 | static noinline_for_stack |
638 | char *resource_string(char *buf, char *end, struct resource *res, | |
639 | struct printf_spec spec, const char *fmt) | |
332d2e78 LT |
640 | { |
641 | #ifndef IO_RSRC_PRINTK_SIZE | |
28405372 | 642 | #define IO_RSRC_PRINTK_SIZE 6 |
332d2e78 LT |
643 | #endif |
644 | ||
645 | #ifndef MEM_RSRC_PRINTK_SIZE | |
28405372 | 646 | #define MEM_RSRC_PRINTK_SIZE 10 |
332d2e78 | 647 | #endif |
4da0b66c | 648 | static const struct printf_spec io_spec = { |
fef20d9c | 649 | .base = 16, |
4da0b66c | 650 | .field_width = IO_RSRC_PRINTK_SIZE, |
fef20d9c FW |
651 | .precision = -1, |
652 | .flags = SPECIAL | SMALL | ZEROPAD, | |
653 | }; | |
4da0b66c BH |
654 | static const struct printf_spec mem_spec = { |
655 | .base = 16, | |
656 | .field_width = MEM_RSRC_PRINTK_SIZE, | |
657 | .precision = -1, | |
658 | .flags = SPECIAL | SMALL | ZEROPAD, | |
659 | }; | |
0f4050c7 BH |
660 | static const struct printf_spec bus_spec = { |
661 | .base = 16, | |
662 | .field_width = 2, | |
663 | .precision = -1, | |
664 | .flags = SMALL | ZEROPAD, | |
665 | }; | |
4da0b66c | 666 | static const struct printf_spec dec_spec = { |
c91d3376 BH |
667 | .base = 10, |
668 | .precision = -1, | |
669 | .flags = 0, | |
670 | }; | |
4da0b66c | 671 | static const struct printf_spec str_spec = { |
fd95541e BH |
672 | .field_width = -1, |
673 | .precision = 10, | |
674 | .flags = LEFT, | |
675 | }; | |
4da0b66c | 676 | static const struct printf_spec flag_spec = { |
fd95541e BH |
677 | .base = 16, |
678 | .precision = -1, | |
679 | .flags = SPECIAL | SMALL, | |
680 | }; | |
c7dabef8 BH |
681 | |
682 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) | |
683 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ | |
684 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) | |
685 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) | |
9d7cca04 | 686 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") |
c7dabef8 BH |
687 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") |
688 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, | |
689 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; | |
690 | ||
332d2e78 | 691 | char *p = sym, *pend = sym + sizeof(sym); |
c7dabef8 | 692 | int decode = (fmt[0] == 'R') ? 1 : 0; |
4da0b66c | 693 | const struct printf_spec *specp; |
332d2e78 LT |
694 | |
695 | *p++ = '['; | |
4da0b66c | 696 | if (res->flags & IORESOURCE_IO) { |
c7dabef8 | 697 | p = string(p, pend, "io ", str_spec); |
4da0b66c BH |
698 | specp = &io_spec; |
699 | } else if (res->flags & IORESOURCE_MEM) { | |
c7dabef8 | 700 | p = string(p, pend, "mem ", str_spec); |
4da0b66c BH |
701 | specp = &mem_spec; |
702 | } else if (res->flags & IORESOURCE_IRQ) { | |
c7dabef8 | 703 | p = string(p, pend, "irq ", str_spec); |
4da0b66c BH |
704 | specp = &dec_spec; |
705 | } else if (res->flags & IORESOURCE_DMA) { | |
c7dabef8 | 706 | p = string(p, pend, "dma ", str_spec); |
4da0b66c | 707 | specp = &dec_spec; |
0f4050c7 BH |
708 | } else if (res->flags & IORESOURCE_BUS) { |
709 | p = string(p, pend, "bus ", str_spec); | |
710 | specp = &bus_spec; | |
4da0b66c | 711 | } else { |
c7dabef8 | 712 | p = string(p, pend, "??? ", str_spec); |
4da0b66c | 713 | specp = &mem_spec; |
c7dabef8 | 714 | decode = 0; |
fd95541e | 715 | } |
d19cb803 BH |
716 | if (decode && res->flags & IORESOURCE_UNSET) { |
717 | p = string(p, pend, "size ", str_spec); | |
718 | p = number(p, pend, resource_size(res), *specp); | |
719 | } else { | |
720 | p = number(p, pend, res->start, *specp); | |
721 | if (res->start != res->end) { | |
722 | *p++ = '-'; | |
723 | p = number(p, pend, res->end, *specp); | |
724 | } | |
c91d3376 | 725 | } |
c7dabef8 | 726 | if (decode) { |
fd95541e BH |
727 | if (res->flags & IORESOURCE_MEM_64) |
728 | p = string(p, pend, " 64bit", str_spec); | |
729 | if (res->flags & IORESOURCE_PREFETCH) | |
730 | p = string(p, pend, " pref", str_spec); | |
9d7cca04 BH |
731 | if (res->flags & IORESOURCE_WINDOW) |
732 | p = string(p, pend, " window", str_spec); | |
fd95541e BH |
733 | if (res->flags & IORESOURCE_DISABLED) |
734 | p = string(p, pend, " disabled", str_spec); | |
c7dabef8 BH |
735 | } else { |
736 | p = string(p, pend, " flags ", str_spec); | |
737 | p = number(p, pend, res->flags, flag_spec); | |
fd95541e | 738 | } |
332d2e78 | 739 | *p++ = ']'; |
c7dabef8 | 740 | *p = '\0'; |
332d2e78 | 741 | |
fef20d9c | 742 | return string(buf, end, sym, spec); |
332d2e78 LT |
743 | } |
744 | ||
31550a16 AS |
745 | static noinline_for_stack |
746 | char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
747 | const char *fmt) | |
748 | { | |
360603a1 | 749 | int i, len = 1; /* if we pass '%ph[CDN]', field width remains |
31550a16 AS |
750 | negative value, fallback to the default */ |
751 | char separator; | |
752 | ||
753 | if (spec.field_width == 0) | |
754 | /* nothing to print */ | |
755 | return buf; | |
756 | ||
757 | if (ZERO_OR_NULL_PTR(addr)) | |
758 | /* NULL pointer */ | |
759 | return string(buf, end, NULL, spec); | |
760 | ||
761 | switch (fmt[1]) { | |
762 | case 'C': | |
763 | separator = ':'; | |
764 | break; | |
765 | case 'D': | |
766 | separator = '-'; | |
767 | break; | |
768 | case 'N': | |
769 | separator = 0; | |
770 | break; | |
771 | default: | |
772 | separator = ' '; | |
773 | break; | |
774 | } | |
775 | ||
776 | if (spec.field_width > 0) | |
777 | len = min_t(int, spec.field_width, 64); | |
778 | ||
779 | for (i = 0; i < len && buf < end - 1; i++) { | |
780 | buf = hex_byte_pack(buf, addr[i]); | |
781 | ||
782 | if (buf < end && separator && i != len - 1) | |
783 | *buf++ = separator; | |
784 | } | |
785 | ||
786 | return buf; | |
787 | } | |
788 | ||
dbc760bc TH |
789 | static noinline_for_stack |
790 | char *bitmap_string(char *buf, char *end, unsigned long *bitmap, | |
791 | struct printf_spec spec, const char *fmt) | |
792 | { | |
793 | const int CHUNKSZ = 32; | |
794 | int nr_bits = max_t(int, spec.field_width, 0); | |
795 | int i, chunksz; | |
796 | bool first = true; | |
797 | ||
798 | /* reused to print numbers */ | |
799 | spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 }; | |
800 | ||
801 | chunksz = nr_bits & (CHUNKSZ - 1); | |
802 | if (chunksz == 0) | |
803 | chunksz = CHUNKSZ; | |
804 | ||
805 | i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ; | |
806 | for (; i >= 0; i -= CHUNKSZ) { | |
807 | u32 chunkmask, val; | |
808 | int word, bit; | |
809 | ||
810 | chunkmask = ((1ULL << chunksz) - 1); | |
811 | word = i / BITS_PER_LONG; | |
812 | bit = i % BITS_PER_LONG; | |
813 | val = (bitmap[word] >> bit) & chunkmask; | |
814 | ||
815 | if (!first) { | |
816 | if (buf < end) | |
817 | *buf = ','; | |
818 | buf++; | |
819 | } | |
820 | first = false; | |
821 | ||
822 | spec.field_width = DIV_ROUND_UP(chunksz, 4); | |
823 | buf = number(buf, end, val, spec); | |
824 | ||
825 | chunksz = CHUNKSZ; | |
826 | } | |
827 | return buf; | |
828 | } | |
829 | ||
830 | static noinline_for_stack | |
831 | char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap, | |
832 | struct printf_spec spec, const char *fmt) | |
833 | { | |
834 | int nr_bits = max_t(int, spec.field_width, 0); | |
835 | /* current bit is 'cur', most recently seen range is [rbot, rtop] */ | |
836 | int cur, rbot, rtop; | |
837 | bool first = true; | |
838 | ||
839 | /* reused to print numbers */ | |
840 | spec = (struct printf_spec){ .base = 10 }; | |
841 | ||
842 | rbot = cur = find_first_bit(bitmap, nr_bits); | |
843 | while (cur < nr_bits) { | |
844 | rtop = cur; | |
845 | cur = find_next_bit(bitmap, nr_bits, cur + 1); | |
846 | if (cur < nr_bits && cur <= rtop + 1) | |
847 | continue; | |
848 | ||
849 | if (!first) { | |
850 | if (buf < end) | |
851 | *buf = ','; | |
852 | buf++; | |
853 | } | |
854 | first = false; | |
855 | ||
856 | buf = number(buf, end, rbot, spec); | |
857 | if (rbot < rtop) { | |
858 | if (buf < end) | |
859 | *buf = '-'; | |
860 | buf++; | |
861 | ||
862 | buf = number(buf, end, rtop, spec); | |
863 | } | |
864 | ||
865 | rbot = cur; | |
866 | } | |
867 | return buf; | |
868 | } | |
869 | ||
cf3b429b JP |
870 | static noinline_for_stack |
871 | char *mac_address_string(char *buf, char *end, u8 *addr, | |
872 | struct printf_spec spec, const char *fmt) | |
dd45c9cf | 873 | { |
8a27f7c9 | 874 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; |
dd45c9cf HH |
875 | char *p = mac_addr; |
876 | int i; | |
bc7259a2 | 877 | char separator; |
76597ff9 | 878 | bool reversed = false; |
bc7259a2 | 879 | |
76597ff9 AE |
880 | switch (fmt[1]) { |
881 | case 'F': | |
bc7259a2 | 882 | separator = '-'; |
76597ff9 AE |
883 | break; |
884 | ||
885 | case 'R': | |
886 | reversed = true; | |
887 | /* fall through */ | |
888 | ||
889 | default: | |
bc7259a2 | 890 | separator = ':'; |
76597ff9 | 891 | break; |
bc7259a2 | 892 | } |
dd45c9cf HH |
893 | |
894 | for (i = 0; i < 6; i++) { | |
76597ff9 AE |
895 | if (reversed) |
896 | p = hex_byte_pack(p, addr[5 - i]); | |
897 | else | |
898 | p = hex_byte_pack(p, addr[i]); | |
899 | ||
8a27f7c9 | 900 | if (fmt[0] == 'M' && i != 5) |
bc7259a2 | 901 | *p++ = separator; |
dd45c9cf HH |
902 | } |
903 | *p = '\0'; | |
904 | ||
fef20d9c | 905 | return string(buf, end, mac_addr, spec); |
dd45c9cf HH |
906 | } |
907 | ||
cf3b429b JP |
908 | static noinline_for_stack |
909 | char *ip4_string(char *p, const u8 *addr, const char *fmt) | |
8a27f7c9 JP |
910 | { |
911 | int i; | |
0159f24e JP |
912 | bool leading_zeros = (fmt[0] == 'i'); |
913 | int index; | |
914 | int step; | |
915 | ||
916 | switch (fmt[2]) { | |
917 | case 'h': | |
918 | #ifdef __BIG_ENDIAN | |
919 | index = 0; | |
920 | step = 1; | |
921 | #else | |
922 | index = 3; | |
923 | step = -1; | |
924 | #endif | |
925 | break; | |
926 | case 'l': | |
927 | index = 3; | |
928 | step = -1; | |
929 | break; | |
930 | case 'n': | |
931 | case 'b': | |
932 | default: | |
933 | index = 0; | |
934 | step = 1; | |
935 | break; | |
936 | } | |
8a27f7c9 JP |
937 | for (i = 0; i < 4; i++) { |
938 | char temp[3]; /* hold each IP quad in reverse order */ | |
133fd9f5 | 939 | int digits = put_dec_trunc8(temp, addr[index]) - temp; |
8a27f7c9 JP |
940 | if (leading_zeros) { |
941 | if (digits < 3) | |
942 | *p++ = '0'; | |
943 | if (digits < 2) | |
944 | *p++ = '0'; | |
945 | } | |
946 | /* reverse the digits in the quad */ | |
947 | while (digits--) | |
948 | *p++ = temp[digits]; | |
949 | if (i < 3) | |
950 | *p++ = '.'; | |
0159f24e | 951 | index += step; |
8a27f7c9 | 952 | } |
8a27f7c9 | 953 | *p = '\0'; |
7b9186f5 | 954 | |
8a27f7c9 JP |
955 | return p; |
956 | } | |
957 | ||
cf3b429b JP |
958 | static noinline_for_stack |
959 | char *ip6_compressed_string(char *p, const char *addr) | |
689afa7d | 960 | { |
7b9186f5 | 961 | int i, j, range; |
8a27f7c9 JP |
962 | unsigned char zerolength[8]; |
963 | int longest = 1; | |
964 | int colonpos = -1; | |
965 | u16 word; | |
7b9186f5 | 966 | u8 hi, lo; |
8a27f7c9 | 967 | bool needcolon = false; |
eb78cd26 JP |
968 | bool useIPv4; |
969 | struct in6_addr in6; | |
970 | ||
971 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
972 | ||
973 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
8a27f7c9 JP |
974 | |
975 | memset(zerolength, 0, sizeof(zerolength)); | |
976 | ||
977 | if (useIPv4) | |
978 | range = 6; | |
979 | else | |
980 | range = 8; | |
981 | ||
982 | /* find position of longest 0 run */ | |
983 | for (i = 0; i < range; i++) { | |
984 | for (j = i; j < range; j++) { | |
eb78cd26 | 985 | if (in6.s6_addr16[j] != 0) |
8a27f7c9 JP |
986 | break; |
987 | zerolength[i]++; | |
988 | } | |
989 | } | |
990 | for (i = 0; i < range; i++) { | |
991 | if (zerolength[i] > longest) { | |
992 | longest = zerolength[i]; | |
993 | colonpos = i; | |
994 | } | |
995 | } | |
29cf519e JP |
996 | if (longest == 1) /* don't compress a single 0 */ |
997 | colonpos = -1; | |
689afa7d | 998 | |
8a27f7c9 JP |
999 | /* emit address */ |
1000 | for (i = 0; i < range; i++) { | |
1001 | if (i == colonpos) { | |
1002 | if (needcolon || i == 0) | |
1003 | *p++ = ':'; | |
1004 | *p++ = ':'; | |
1005 | needcolon = false; | |
1006 | i += longest - 1; | |
1007 | continue; | |
1008 | } | |
1009 | if (needcolon) { | |
1010 | *p++ = ':'; | |
1011 | needcolon = false; | |
1012 | } | |
1013 | /* hex u16 without leading 0s */ | |
eb78cd26 | 1014 | word = ntohs(in6.s6_addr16[i]); |
8a27f7c9 JP |
1015 | hi = word >> 8; |
1016 | lo = word & 0xff; | |
1017 | if (hi) { | |
1018 | if (hi > 0x0f) | |
55036ba7 | 1019 | p = hex_byte_pack(p, hi); |
8a27f7c9 JP |
1020 | else |
1021 | *p++ = hex_asc_lo(hi); | |
55036ba7 | 1022 | p = hex_byte_pack(p, lo); |
8a27f7c9 | 1023 | } |
b5ff992b | 1024 | else if (lo > 0x0f) |
55036ba7 | 1025 | p = hex_byte_pack(p, lo); |
8a27f7c9 JP |
1026 | else |
1027 | *p++ = hex_asc_lo(lo); | |
1028 | needcolon = true; | |
1029 | } | |
1030 | ||
1031 | if (useIPv4) { | |
1032 | if (needcolon) | |
1033 | *p++ = ':'; | |
0159f24e | 1034 | p = ip4_string(p, &in6.s6_addr[12], "I4"); |
8a27f7c9 | 1035 | } |
8a27f7c9 | 1036 | *p = '\0'; |
7b9186f5 | 1037 | |
8a27f7c9 JP |
1038 | return p; |
1039 | } | |
1040 | ||
cf3b429b JP |
1041 | static noinline_for_stack |
1042 | char *ip6_string(char *p, const char *addr, const char *fmt) | |
8a27f7c9 JP |
1043 | { |
1044 | int i; | |
7b9186f5 | 1045 | |
689afa7d | 1046 | for (i = 0; i < 8; i++) { |
55036ba7 AS |
1047 | p = hex_byte_pack(p, *addr++); |
1048 | p = hex_byte_pack(p, *addr++); | |
8a27f7c9 | 1049 | if (fmt[0] == 'I' && i != 7) |
689afa7d HH |
1050 | *p++ = ':'; |
1051 | } | |
1052 | *p = '\0'; | |
7b9186f5 | 1053 | |
8a27f7c9 JP |
1054 | return p; |
1055 | } | |
1056 | ||
cf3b429b JP |
1057 | static noinline_for_stack |
1058 | char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
1059 | struct printf_spec spec, const char *fmt) | |
8a27f7c9 JP |
1060 | { |
1061 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
1062 | ||
1063 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
eb78cd26 | 1064 | ip6_compressed_string(ip6_addr, addr); |
8a27f7c9 | 1065 | else |
eb78cd26 | 1066 | ip6_string(ip6_addr, addr, fmt); |
689afa7d | 1067 | |
fef20d9c | 1068 | return string(buf, end, ip6_addr, spec); |
689afa7d HH |
1069 | } |
1070 | ||
cf3b429b JP |
1071 | static noinline_for_stack |
1072 | char *ip4_addr_string(char *buf, char *end, const u8 *addr, | |
1073 | struct printf_spec spec, const char *fmt) | |
4aa99606 | 1074 | { |
8a27f7c9 | 1075 | char ip4_addr[sizeof("255.255.255.255")]; |
4aa99606 | 1076 | |
0159f24e | 1077 | ip4_string(ip4_addr, addr, fmt); |
4aa99606 | 1078 | |
fef20d9c | 1079 | return string(buf, end, ip4_addr, spec); |
4aa99606 HH |
1080 | } |
1081 | ||
10679643 DB |
1082 | static noinline_for_stack |
1083 | char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa, | |
1084 | struct printf_spec spec, const char *fmt) | |
1085 | { | |
1086 | bool have_p = false, have_s = false, have_f = false, have_c = false; | |
1087 | char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") + | |
1088 | sizeof(":12345") + sizeof("/123456789") + | |
1089 | sizeof("%1234567890")]; | |
1090 | char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr); | |
1091 | const u8 *addr = (const u8 *) &sa->sin6_addr; | |
1092 | char fmt6[2] = { fmt[0], '6' }; | |
1093 | u8 off = 0; | |
1094 | ||
1095 | fmt++; | |
1096 | while (isalpha(*++fmt)) { | |
1097 | switch (*fmt) { | |
1098 | case 'p': | |
1099 | have_p = true; | |
1100 | break; | |
1101 | case 'f': | |
1102 | have_f = true; | |
1103 | break; | |
1104 | case 's': | |
1105 | have_s = true; | |
1106 | break; | |
1107 | case 'c': | |
1108 | have_c = true; | |
1109 | break; | |
1110 | } | |
1111 | } | |
1112 | ||
1113 | if (have_p || have_s || have_f) { | |
1114 | *p = '['; | |
1115 | off = 1; | |
1116 | } | |
1117 | ||
1118 | if (fmt6[0] == 'I' && have_c) | |
1119 | p = ip6_compressed_string(ip6_addr + off, addr); | |
1120 | else | |
1121 | p = ip6_string(ip6_addr + off, addr, fmt6); | |
1122 | ||
1123 | if (have_p || have_s || have_f) | |
1124 | *p++ = ']'; | |
1125 | ||
1126 | if (have_p) { | |
1127 | *p++ = ':'; | |
1128 | p = number(p, pend, ntohs(sa->sin6_port), spec); | |
1129 | } | |
1130 | if (have_f) { | |
1131 | *p++ = '/'; | |
1132 | p = number(p, pend, ntohl(sa->sin6_flowinfo & | |
1133 | IPV6_FLOWINFO_MASK), spec); | |
1134 | } | |
1135 | if (have_s) { | |
1136 | *p++ = '%'; | |
1137 | p = number(p, pend, sa->sin6_scope_id, spec); | |
1138 | } | |
1139 | *p = '\0'; | |
1140 | ||
1141 | return string(buf, end, ip6_addr, spec); | |
1142 | } | |
1143 | ||
1144 | static noinline_for_stack | |
1145 | char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa, | |
1146 | struct printf_spec spec, const char *fmt) | |
1147 | { | |
1148 | bool have_p = false; | |
1149 | char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")]; | |
1150 | char *pend = ip4_addr + sizeof(ip4_addr); | |
1151 | const u8 *addr = (const u8 *) &sa->sin_addr.s_addr; | |
1152 | char fmt4[3] = { fmt[0], '4', 0 }; | |
1153 | ||
1154 | fmt++; | |
1155 | while (isalpha(*++fmt)) { | |
1156 | switch (*fmt) { | |
1157 | case 'p': | |
1158 | have_p = true; | |
1159 | break; | |
1160 | case 'h': | |
1161 | case 'l': | |
1162 | case 'n': | |
1163 | case 'b': | |
1164 | fmt4[2] = *fmt; | |
1165 | break; | |
1166 | } | |
1167 | } | |
1168 | ||
1169 | p = ip4_string(ip4_addr, addr, fmt4); | |
1170 | if (have_p) { | |
1171 | *p++ = ':'; | |
1172 | p = number(p, pend, ntohs(sa->sin_port), spec); | |
1173 | } | |
1174 | *p = '\0'; | |
1175 | ||
1176 | return string(buf, end, ip4_addr, spec); | |
1177 | } | |
1178 | ||
71dca95d AS |
1179 | static noinline_for_stack |
1180 | char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
1181 | const char *fmt) | |
1182 | { | |
1183 | bool found = true; | |
1184 | int count = 1; | |
1185 | unsigned int flags = 0; | |
1186 | int len; | |
1187 | ||
1188 | if (spec.field_width == 0) | |
1189 | return buf; /* nothing to print */ | |
1190 | ||
1191 | if (ZERO_OR_NULL_PTR(addr)) | |
1192 | return string(buf, end, NULL, spec); /* NULL pointer */ | |
1193 | ||
1194 | ||
1195 | do { | |
1196 | switch (fmt[count++]) { | |
1197 | case 'a': | |
1198 | flags |= ESCAPE_ANY; | |
1199 | break; | |
1200 | case 'c': | |
1201 | flags |= ESCAPE_SPECIAL; | |
1202 | break; | |
1203 | case 'h': | |
1204 | flags |= ESCAPE_HEX; | |
1205 | break; | |
1206 | case 'n': | |
1207 | flags |= ESCAPE_NULL; | |
1208 | break; | |
1209 | case 'o': | |
1210 | flags |= ESCAPE_OCTAL; | |
1211 | break; | |
1212 | case 'p': | |
1213 | flags |= ESCAPE_NP; | |
1214 | break; | |
1215 | case 's': | |
1216 | flags |= ESCAPE_SPACE; | |
1217 | break; | |
1218 | default: | |
1219 | found = false; | |
1220 | break; | |
1221 | } | |
1222 | } while (found); | |
1223 | ||
1224 | if (!flags) | |
1225 | flags = ESCAPE_ANY_NP; | |
1226 | ||
1227 | len = spec.field_width < 0 ? 1 : spec.field_width; | |
1228 | ||
1229 | /* Ignore the error. We print as many characters as we can */ | |
1230 | string_escape_mem(addr, len, &buf, end - buf, flags, NULL); | |
1231 | ||
1232 | return buf; | |
1233 | } | |
1234 | ||
cf3b429b JP |
1235 | static noinline_for_stack |
1236 | char *uuid_string(char *buf, char *end, const u8 *addr, | |
1237 | struct printf_spec spec, const char *fmt) | |
9ac6e44e JP |
1238 | { |
1239 | char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; | |
1240 | char *p = uuid; | |
1241 | int i; | |
1242 | static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; | |
1243 | static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; | |
1244 | const u8 *index = be; | |
1245 | bool uc = false; | |
1246 | ||
1247 | switch (*(++fmt)) { | |
1248 | case 'L': | |
1249 | uc = true; /* fall-through */ | |
1250 | case 'l': | |
1251 | index = le; | |
1252 | break; | |
1253 | case 'B': | |
1254 | uc = true; | |
1255 | break; | |
1256 | } | |
1257 | ||
1258 | for (i = 0; i < 16; i++) { | |
55036ba7 | 1259 | p = hex_byte_pack(p, addr[index[i]]); |
9ac6e44e JP |
1260 | switch (i) { |
1261 | case 3: | |
1262 | case 5: | |
1263 | case 7: | |
1264 | case 9: | |
1265 | *p++ = '-'; | |
1266 | break; | |
1267 | } | |
1268 | } | |
1269 | ||
1270 | *p = 0; | |
1271 | ||
1272 | if (uc) { | |
1273 | p = uuid; | |
1274 | do { | |
1275 | *p = toupper(*p); | |
1276 | } while (*(++p)); | |
1277 | } | |
1278 | ||
1279 | return string(buf, end, uuid, spec); | |
1280 | } | |
1281 | ||
c8f44aff MM |
1282 | static |
1283 | char *netdev_feature_string(char *buf, char *end, const u8 *addr, | |
1284 | struct printf_spec spec) | |
1285 | { | |
1286 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
1287 | if (spec.field_width == -1) | |
1288 | spec.field_width = 2 + 2 * sizeof(netdev_features_t); | |
1289 | spec.base = 16; | |
1290 | ||
1291 | return number(buf, end, *(const netdev_features_t *)addr, spec); | |
1292 | } | |
1293 | ||
aaf07621 JP |
1294 | static noinline_for_stack |
1295 | char *address_val(char *buf, char *end, const void *addr, | |
1296 | struct printf_spec spec, const char *fmt) | |
1297 | { | |
1298 | unsigned long long num; | |
1299 | ||
1300 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
1301 | spec.base = 16; | |
1302 | ||
1303 | switch (fmt[1]) { | |
1304 | case 'd': | |
1305 | num = *(const dma_addr_t *)addr; | |
1306 | spec.field_width = sizeof(dma_addr_t) * 2 + 2; | |
1307 | break; | |
1308 | case 'p': | |
1309 | default: | |
1310 | num = *(const phys_addr_t *)addr; | |
1311 | spec.field_width = sizeof(phys_addr_t) * 2 + 2; | |
1312 | break; | |
1313 | } | |
1314 | ||
1315 | return number(buf, end, num, spec); | |
1316 | } | |
1317 | ||
411f05f1 | 1318 | int kptr_restrict __read_mostly; |
455cd5ab | 1319 | |
4d8a743c LT |
1320 | /* |
1321 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
1322 | * by an extra set of alphanumeric characters that are extended format | |
1323 | * specifiers. | |
1324 | * | |
332d2e78 LT |
1325 | * Right now we handle: |
1326 | * | |
0c8b946e FW |
1327 | * - 'F' For symbolic function descriptor pointers with offset |
1328 | * - 'f' For simple symbolic function names without offset | |
0efb4d20 SR |
1329 | * - 'S' For symbolic direct pointers with offset |
1330 | * - 's' For symbolic direct pointers without offset | |
b0d33c2b | 1331 | * - '[FfSs]R' as above with __builtin_extract_return_addr() translation |
0f77a8d3 | 1332 | * - 'B' For backtraced symbolic direct pointers with offset |
c7dabef8 BH |
1333 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] |
1334 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] | |
dbc760bc TH |
1335 | * - 'b[l]' For a bitmap, the number of bits is determined by the field |
1336 | * width which must be explicitly specified either as part of the | |
1337 | * format string '%32b[l]' or through '%*b[l]', [l] selects | |
1338 | * range-list format instead of hex format | |
dd45c9cf HH |
1339 | * - 'M' For a 6-byte MAC address, it prints the address in the |
1340 | * usual colon-separated hex notation | |
8a27f7c9 | 1341 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons |
bc7259a2 | 1342 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address |
c8e00060 | 1343 | * with a dash-separated hex notation |
7c59154e | 1344 | * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth) |
8a27f7c9 JP |
1345 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way |
1346 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
1347 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
10679643 DB |
1348 | * [S][pfs] |
1349 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1350 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
8a27f7c9 JP |
1351 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses |
1352 | * IPv6 omits the colons (01020304...0f) | |
1353 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
10679643 DB |
1354 | * [S][pfs] |
1355 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1356 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
1357 | * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order | |
1358 | * - 'I[6S]c' for IPv6 addresses printed as specified by | |
29cf519e | 1359 | * http://tools.ietf.org/html/rfc5952 |
71dca95d AS |
1360 | * - 'E[achnops]' For an escaped buffer, where rules are defined by combination |
1361 | * of the following flags (see string_escape_mem() for the | |
1362 | * details): | |
1363 | * a - ESCAPE_ANY | |
1364 | * c - ESCAPE_SPECIAL | |
1365 | * h - ESCAPE_HEX | |
1366 | * n - ESCAPE_NULL | |
1367 | * o - ESCAPE_OCTAL | |
1368 | * p - ESCAPE_NP | |
1369 | * s - ESCAPE_SPACE | |
1370 | * By default ESCAPE_ANY_NP is used. | |
9ac6e44e JP |
1371 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form |
1372 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" | |
1373 | * Options for %pU are: | |
1374 | * b big endian lower case hex (default) | |
1375 | * B big endian UPPER case hex | |
1376 | * l little endian lower case hex | |
1377 | * L little endian UPPER case hex | |
1378 | * big endian output byte order is: | |
1379 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] | |
1380 | * little endian output byte order is: | |
1381 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] | |
7db6f5fb JP |
1382 | * - 'V' For a struct va_format which contains a format string * and va_list *, |
1383 | * call vsnprintf(->format, *->va_list). | |
1384 | * Implements a "recursive vsnprintf". | |
1385 | * Do not use this feature without some mechanism to verify the | |
1386 | * correctness of the format string and va_list arguments. | |
455cd5ab | 1387 | * - 'K' For a kernel pointer that should be hidden from unprivileged users |
c8f44aff | 1388 | * - 'NF' For a netdev_features_t |
31550a16 AS |
1389 | * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with |
1390 | * a certain separator (' ' by default): | |
1391 | * C colon | |
1392 | * D dash | |
1393 | * N no separator | |
1394 | * The maximum supported length is 64 bytes of the input. Consider | |
1395 | * to use print_hex_dump() for the larger input. | |
aaf07621 JP |
1396 | * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives |
1397 | * (default assumed to be phys_addr_t, passed by reference) | |
c0d92a57 OJ |
1398 | * - 'd[234]' For a dentry name (optionally 2-4 last components) |
1399 | * - 'D[234]' Same as 'd' but for a struct file | |
9ac6e44e | 1400 | * |
332d2e78 LT |
1401 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 |
1402 | * function pointers are really function descriptors, which contain a | |
1403 | * pointer to the real address. | |
4d8a743c | 1404 | */ |
cf3b429b JP |
1405 | static noinline_for_stack |
1406 | char *pointer(const char *fmt, char *buf, char *end, void *ptr, | |
1407 | struct printf_spec spec) | |
78a8bf69 | 1408 | { |
725fe002 GL |
1409 | int default_width = 2 * sizeof(void *) + (spec.flags & SPECIAL ? 2 : 0); |
1410 | ||
9f36e2c4 | 1411 | if (!ptr && *fmt != 'K') { |
5e057981 JP |
1412 | /* |
1413 | * Print (null) with the same width as a pointer so it makes | |
1414 | * tabular output look nice. | |
1415 | */ | |
1416 | if (spec.field_width == -1) | |
725fe002 | 1417 | spec.field_width = default_width; |
fef20d9c | 1418 | return string(buf, end, "(null)", spec); |
5e057981 | 1419 | } |
d97106ab | 1420 | |
0fe1ef24 LT |
1421 | switch (*fmt) { |
1422 | case 'F': | |
0c8b946e | 1423 | case 'f': |
0fe1ef24 LT |
1424 | ptr = dereference_function_descriptor(ptr); |
1425 | /* Fallthrough */ | |
1426 | case 'S': | |
9ac6e44e | 1427 | case 's': |
0f77a8d3 | 1428 | case 'B': |
b0d33c2b | 1429 | return symbol_string(buf, end, ptr, spec, fmt); |
332d2e78 | 1430 | case 'R': |
c7dabef8 | 1431 | case 'r': |
fd95541e | 1432 | return resource_string(buf, end, ptr, spec, fmt); |
31550a16 AS |
1433 | case 'h': |
1434 | return hex_string(buf, end, ptr, spec, fmt); | |
dbc760bc TH |
1435 | case 'b': |
1436 | switch (fmt[1]) { | |
1437 | case 'l': | |
1438 | return bitmap_list_string(buf, end, ptr, spec, fmt); | |
1439 | default: | |
1440 | return bitmap_string(buf, end, ptr, spec, fmt); | |
1441 | } | |
8a27f7c9 JP |
1442 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
1443 | case 'm': /* Contiguous: 000102030405 */ | |
76597ff9 AE |
1444 | /* [mM]F (FDDI) */ |
1445 | /* [mM]R (Reverse order; Bluetooth) */ | |
8a27f7c9 JP |
1446 | return mac_address_string(buf, end, ptr, spec, fmt); |
1447 | case 'I': /* Formatted IP supported | |
1448 | * 4: 1.2.3.4 | |
1449 | * 6: 0001:0203:...:0708 | |
1450 | * 6c: 1::708 or 1::1.2.3.4 | |
1451 | */ | |
1452 | case 'i': /* Contiguous: | |
1453 | * 4: 001.002.003.004 | |
1454 | * 6: 000102...0f | |
1455 | */ | |
1456 | switch (fmt[1]) { | |
1457 | case '6': | |
1458 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
1459 | case '4': | |
1460 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
10679643 DB |
1461 | case 'S': { |
1462 | const union { | |
1463 | struct sockaddr raw; | |
1464 | struct sockaddr_in v4; | |
1465 | struct sockaddr_in6 v6; | |
1466 | } *sa = ptr; | |
1467 | ||
1468 | switch (sa->raw.sa_family) { | |
1469 | case AF_INET: | |
1470 | return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt); | |
1471 | case AF_INET6: | |
1472 | return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt); | |
1473 | default: | |
1474 | return string(buf, end, "(invalid address)", spec); | |
1475 | }} | |
8a27f7c9 | 1476 | } |
fef20d9c | 1477 | break; |
71dca95d AS |
1478 | case 'E': |
1479 | return escaped_string(buf, end, ptr, spec, fmt); | |
9ac6e44e JP |
1480 | case 'U': |
1481 | return uuid_string(buf, end, ptr, spec, fmt); | |
7db6f5fb | 1482 | case 'V': |
5756b76e JB |
1483 | { |
1484 | va_list va; | |
1485 | ||
1486 | va_copy(va, *((struct va_format *)ptr)->va); | |
1487 | buf += vsnprintf(buf, end > buf ? end - buf : 0, | |
1488 | ((struct va_format *)ptr)->fmt, va); | |
1489 | va_end(va); | |
1490 | return buf; | |
1491 | } | |
455cd5ab DR |
1492 | case 'K': |
1493 | /* | |
1494 | * %pK cannot be used in IRQ context because its test | |
1495 | * for CAP_SYSLOG would be meaningless. | |
1496 | */ | |
3715c530 DR |
1497 | if (kptr_restrict && (in_irq() || in_serving_softirq() || |
1498 | in_nmi())) { | |
455cd5ab | 1499 | if (spec.field_width == -1) |
725fe002 | 1500 | spec.field_width = default_width; |
455cd5ab | 1501 | return string(buf, end, "pK-error", spec); |
455cd5ab | 1502 | } |
312b4e22 RM |
1503 | |
1504 | switch (kptr_restrict) { | |
1505 | case 0: | |
1506 | /* Always print %pK values */ | |
1507 | break; | |
1508 | case 1: { | |
1509 | /* | |
1510 | * Only print the real pointer value if the current | |
1511 | * process has CAP_SYSLOG and is running with the | |
1512 | * same credentials it started with. This is because | |
1513 | * access to files is checked at open() time, but %pK | |
1514 | * checks permission at read() time. We don't want to | |
1515 | * leak pointer values if a binary opens a file using | |
1516 | * %pK and then elevates privileges before reading it. | |
1517 | */ | |
1518 | const struct cred *cred = current_cred(); | |
1519 | ||
1520 | if (!has_capability_noaudit(current, CAP_SYSLOG) || | |
1521 | !uid_eq(cred->euid, cred->uid) || | |
1522 | !gid_eq(cred->egid, cred->gid)) | |
1523 | ptr = NULL; | |
1524 | break; | |
1525 | } | |
1526 | case 2: | |
1527 | default: | |
1528 | /* Always print 0's for %pK */ | |
26297607 | 1529 | ptr = NULL; |
312b4e22 RM |
1530 | break; |
1531 | } | |
26297607 | 1532 | break; |
312b4e22 | 1533 | |
c8f44aff MM |
1534 | case 'N': |
1535 | switch (fmt[1]) { | |
1536 | case 'F': | |
1537 | return netdev_feature_string(buf, end, ptr, spec); | |
1538 | } | |
1539 | break; | |
7d799210 | 1540 | case 'a': |
aaf07621 | 1541 | return address_val(buf, end, ptr, spec, fmt); |
4b6ccca7 AV |
1542 | case 'd': |
1543 | return dentry_name(buf, end, ptr, spec, fmt); | |
1544 | case 'D': | |
1545 | return dentry_name(buf, end, | |
1546 | ((const struct file *)ptr)->f_path.dentry, | |
1547 | spec, fmt); | |
fef20d9c FW |
1548 | } |
1549 | spec.flags |= SMALL; | |
1550 | if (spec.field_width == -1) { | |
725fe002 | 1551 | spec.field_width = default_width; |
fef20d9c FW |
1552 | spec.flags |= ZEROPAD; |
1553 | } | |
1554 | spec.base = 16; | |
1555 | ||
1556 | return number(buf, end, (unsigned long) ptr, spec); | |
1557 | } | |
1558 | ||
1559 | /* | |
1560 | * Helper function to decode printf style format. | |
1561 | * Each call decode a token from the format and return the | |
1562 | * number of characters read (or likely the delta where it wants | |
1563 | * to go on the next call). | |
1564 | * The decoded token is returned through the parameters | |
1565 | * | |
1566 | * 'h', 'l', or 'L' for integer fields | |
1567 | * 'z' support added 23/7/1999 S.H. | |
1568 | * 'z' changed to 'Z' --davidm 1/25/99 | |
1569 | * 't' added for ptrdiff_t | |
1570 | * | |
1571 | * @fmt: the format string | |
1572 | * @type of the token returned | |
1573 | * @flags: various flags such as +, -, # tokens.. | |
1574 | * @field_width: overwritten width | |
1575 | * @base: base of the number (octal, hex, ...) | |
1576 | * @precision: precision of a number | |
1577 | * @qualifier: qualifier of a number (long, size_t, ...) | |
1578 | */ | |
cf3b429b JP |
1579 | static noinline_for_stack |
1580 | int format_decode(const char *fmt, struct printf_spec *spec) | |
fef20d9c FW |
1581 | { |
1582 | const char *start = fmt; | |
fef20d9c FW |
1583 | |
1584 | /* we finished early by reading the field width */ | |
ed681a91 | 1585 | if (spec->type == FORMAT_TYPE_WIDTH) { |
fef20d9c FW |
1586 | if (spec->field_width < 0) { |
1587 | spec->field_width = -spec->field_width; | |
1588 | spec->flags |= LEFT; | |
1589 | } | |
1590 | spec->type = FORMAT_TYPE_NONE; | |
1591 | goto precision; | |
1592 | } | |
1593 | ||
1594 | /* we finished early by reading the precision */ | |
1595 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
1596 | if (spec->precision < 0) | |
1597 | spec->precision = 0; | |
1598 | ||
1599 | spec->type = FORMAT_TYPE_NONE; | |
1600 | goto qualifier; | |
1601 | } | |
1602 | ||
1603 | /* By default */ | |
1604 | spec->type = FORMAT_TYPE_NONE; | |
1605 | ||
1606 | for (; *fmt ; ++fmt) { | |
1607 | if (*fmt == '%') | |
1608 | break; | |
1609 | } | |
1610 | ||
1611 | /* Return the current non-format string */ | |
1612 | if (fmt != start || !*fmt) | |
1613 | return fmt - start; | |
1614 | ||
1615 | /* Process flags */ | |
1616 | spec->flags = 0; | |
1617 | ||
1618 | while (1) { /* this also skips first '%' */ | |
1619 | bool found = true; | |
1620 | ||
1621 | ++fmt; | |
1622 | ||
1623 | switch (*fmt) { | |
1624 | case '-': spec->flags |= LEFT; break; | |
1625 | case '+': spec->flags |= PLUS; break; | |
1626 | case ' ': spec->flags |= SPACE; break; | |
1627 | case '#': spec->flags |= SPECIAL; break; | |
1628 | case '0': spec->flags |= ZEROPAD; break; | |
1629 | default: found = false; | |
1630 | } | |
1631 | ||
1632 | if (!found) | |
1633 | break; | |
1634 | } | |
1635 | ||
1636 | /* get field width */ | |
1637 | spec->field_width = -1; | |
1638 | ||
1639 | if (isdigit(*fmt)) | |
1640 | spec->field_width = skip_atoi(&fmt); | |
1641 | else if (*fmt == '*') { | |
1642 | /* it's the next argument */ | |
ed681a91 | 1643 | spec->type = FORMAT_TYPE_WIDTH; |
fef20d9c FW |
1644 | return ++fmt - start; |
1645 | } | |
1646 | ||
1647 | precision: | |
1648 | /* get the precision */ | |
1649 | spec->precision = -1; | |
1650 | if (*fmt == '.') { | |
1651 | ++fmt; | |
1652 | if (isdigit(*fmt)) { | |
1653 | spec->precision = skip_atoi(&fmt); | |
1654 | if (spec->precision < 0) | |
1655 | spec->precision = 0; | |
1656 | } else if (*fmt == '*') { | |
1657 | /* it's the next argument */ | |
adf26f84 | 1658 | spec->type = FORMAT_TYPE_PRECISION; |
fef20d9c FW |
1659 | return ++fmt - start; |
1660 | } | |
1661 | } | |
1662 | ||
1663 | qualifier: | |
1664 | /* get the conversion qualifier */ | |
1665 | spec->qualifier = -1; | |
75fb8f26 AS |
1666 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
1667 | _tolower(*fmt) == 'z' || *fmt == 't') { | |
a4e94ef0 Z |
1668 | spec->qualifier = *fmt++; |
1669 | if (unlikely(spec->qualifier == *fmt)) { | |
1670 | if (spec->qualifier == 'l') { | |
1671 | spec->qualifier = 'L'; | |
1672 | ++fmt; | |
1673 | } else if (spec->qualifier == 'h') { | |
1674 | spec->qualifier = 'H'; | |
1675 | ++fmt; | |
1676 | } | |
fef20d9c FW |
1677 | } |
1678 | } | |
1679 | ||
1680 | /* default base */ | |
1681 | spec->base = 10; | |
1682 | switch (*fmt) { | |
1683 | case 'c': | |
1684 | spec->type = FORMAT_TYPE_CHAR; | |
1685 | return ++fmt - start; | |
1686 | ||
1687 | case 's': | |
1688 | spec->type = FORMAT_TYPE_STR; | |
1689 | return ++fmt - start; | |
1690 | ||
1691 | case 'p': | |
1692 | spec->type = FORMAT_TYPE_PTR; | |
ffbfed03 | 1693 | return ++fmt - start; |
fef20d9c | 1694 | |
fef20d9c FW |
1695 | case '%': |
1696 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
1697 | return ++fmt - start; | |
1698 | ||
1699 | /* integer number formats - set up the flags and "break" */ | |
1700 | case 'o': | |
1701 | spec->base = 8; | |
1702 | break; | |
1703 | ||
1704 | case 'x': | |
1705 | spec->flags |= SMALL; | |
1706 | ||
1707 | case 'X': | |
1708 | spec->base = 16; | |
1709 | break; | |
1710 | ||
1711 | case 'd': | |
1712 | case 'i': | |
39e874f8 | 1713 | spec->flags |= SIGN; |
fef20d9c | 1714 | case 'u': |
4aa99606 | 1715 | break; |
fef20d9c | 1716 | |
708d96fd RM |
1717 | case 'n': |
1718 | /* | |
1719 | * Since %n poses a greater security risk than utility, treat | |
1720 | * it as an invalid format specifier. Warn about its use so | |
1721 | * that new instances don't get added. | |
1722 | */ | |
1723 | WARN_ONCE(1, "Please remove ignored %%n in '%s'\n", fmt); | |
1724 | /* Fall-through */ | |
1725 | ||
fef20d9c FW |
1726 | default: |
1727 | spec->type = FORMAT_TYPE_INVALID; | |
1728 | return fmt - start; | |
0fe1ef24 | 1729 | } |
fef20d9c FW |
1730 | |
1731 | if (spec->qualifier == 'L') | |
1732 | spec->type = FORMAT_TYPE_LONG_LONG; | |
1733 | else if (spec->qualifier == 'l') { | |
51be17df RV |
1734 | BUILD_BUG_ON(FORMAT_TYPE_ULONG + SIGN != FORMAT_TYPE_LONG); |
1735 | spec->type = FORMAT_TYPE_ULONG + (spec->flags & SIGN); | |
75fb8f26 | 1736 | } else if (_tolower(spec->qualifier) == 'z') { |
fef20d9c FW |
1737 | spec->type = FORMAT_TYPE_SIZE_T; |
1738 | } else if (spec->qualifier == 't') { | |
1739 | spec->type = FORMAT_TYPE_PTRDIFF; | |
a4e94ef0 | 1740 | } else if (spec->qualifier == 'H') { |
51be17df RV |
1741 | BUILD_BUG_ON(FORMAT_TYPE_UBYTE + SIGN != FORMAT_TYPE_BYTE); |
1742 | spec->type = FORMAT_TYPE_UBYTE + (spec->flags & SIGN); | |
fef20d9c | 1743 | } else if (spec->qualifier == 'h') { |
51be17df RV |
1744 | BUILD_BUG_ON(FORMAT_TYPE_USHORT + SIGN != FORMAT_TYPE_SHORT); |
1745 | spec->type = FORMAT_TYPE_USHORT + (spec->flags & SIGN); | |
fef20d9c | 1746 | } else { |
51be17df RV |
1747 | BUILD_BUG_ON(FORMAT_TYPE_UINT + SIGN != FORMAT_TYPE_INT); |
1748 | spec->type = FORMAT_TYPE_UINT + (spec->flags & SIGN); | |
78a8bf69 | 1749 | } |
fef20d9c FW |
1750 | |
1751 | return ++fmt - start; | |
78a8bf69 LT |
1752 | } |
1753 | ||
1da177e4 LT |
1754 | /** |
1755 | * vsnprintf - Format a string and place it in a buffer | |
1756 | * @buf: The buffer to place the result into | |
1757 | * @size: The size of the buffer, including the trailing null space | |
1758 | * @fmt: The format string to use | |
1759 | * @args: Arguments for the format string | |
1760 | * | |
20036fdc | 1761 | * This function follows C99 vsnprintf, but has some extensions: |
91adcd2c SR |
1762 | * %pS output the name of a text symbol with offset |
1763 | * %ps output the name of a text symbol without offset | |
0c8b946e FW |
1764 | * %pF output the name of a function pointer with its offset |
1765 | * %pf output the name of a function pointer without its offset | |
0f77a8d3 | 1766 | * %pB output the name of a backtrace symbol with its offset |
8a79503a UKK |
1767 | * %pR output the address range in a struct resource with decoded flags |
1768 | * %pr output the address range in a struct resource with raw flags | |
dbc760bc TH |
1769 | * %pb output the bitmap with field width as the number of bits |
1770 | * %pbl output the bitmap as range list with field width as the number of bits | |
8a79503a | 1771 | * %pM output a 6-byte MAC address with colons |
7c59154e AS |
1772 | * %pMR output a 6-byte MAC address with colons in reversed order |
1773 | * %pMF output a 6-byte MAC address with dashes | |
8a79503a | 1774 | * %pm output a 6-byte MAC address without colons |
7c59154e | 1775 | * %pmR output a 6-byte MAC address without colons in reversed order |
8a79503a UKK |
1776 | * %pI4 print an IPv4 address without leading zeros |
1777 | * %pi4 print an IPv4 address with leading zeros | |
1778 | * %pI6 print an IPv6 address with colons | |
1779 | * %pi6 print an IPv6 address without colons | |
f996f208 | 1780 | * %pI6c print an IPv6 address as specified by RFC 5952 |
10679643 DB |
1781 | * %pIS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address |
1782 | * %piS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address | |
8a79503a UKK |
1783 | * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper |
1784 | * case. | |
71dca95d | 1785 | * %*pE[achnops] print an escaped buffer |
31550a16 AS |
1786 | * %*ph[CDN] a variable-length hex string with a separator (supports up to 64 |
1787 | * bytes of the input) | |
0efb4d20 | 1788 | * %n is ignored |
20036fdc | 1789 | * |
80f548e0 AM |
1790 | * ** Please update Documentation/printk-formats.txt when making changes ** |
1791 | * | |
1da177e4 LT |
1792 | * The return value is the number of characters which would |
1793 | * be generated for the given input, excluding the trailing | |
1794 | * '\0', as per ISO C99. If you want to have the exact | |
1795 | * number of characters written into @buf as return value | |
72fd4a35 | 1796 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
1797 | * return is greater than or equal to @size, the resulting |
1798 | * string is truncated. | |
1799 | * | |
ba1835eb | 1800 | * If you're not already dealing with a va_list consider using snprintf(). |
1da177e4 LT |
1801 | */ |
1802 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1803 | { | |
1da177e4 | 1804 | unsigned long long num; |
d4be151b | 1805 | char *str, *end; |
fef20d9c | 1806 | struct printf_spec spec = {0}; |
1da177e4 | 1807 | |
f796937a JF |
1808 | /* Reject out-of-range values early. Large positive sizes are |
1809 | used for unknown buffer sizes. */ | |
2aa2f9e2 | 1810 | if (WARN_ON_ONCE(size > INT_MAX)) |
1da177e4 | 1811 | return 0; |
1da177e4 LT |
1812 | |
1813 | str = buf; | |
f796937a | 1814 | end = buf + size; |
1da177e4 | 1815 | |
f796937a JF |
1816 | /* Make sure end is always >= buf */ |
1817 | if (end < buf) { | |
1818 | end = ((void *)-1); | |
1819 | size = end - buf; | |
1da177e4 LT |
1820 | } |
1821 | ||
fef20d9c FW |
1822 | while (*fmt) { |
1823 | const char *old_fmt = fmt; | |
d4be151b | 1824 | int read = format_decode(fmt, &spec); |
1da177e4 | 1825 | |
fef20d9c | 1826 | fmt += read; |
1da177e4 | 1827 | |
fef20d9c FW |
1828 | switch (spec.type) { |
1829 | case FORMAT_TYPE_NONE: { | |
1830 | int copy = read; | |
1831 | if (str < end) { | |
1832 | if (copy > end - str) | |
1833 | copy = end - str; | |
1834 | memcpy(str, old_fmt, copy); | |
1da177e4 | 1835 | } |
fef20d9c FW |
1836 | str += read; |
1837 | break; | |
1da177e4 LT |
1838 | } |
1839 | ||
ed681a91 | 1840 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1841 | spec.field_width = va_arg(args, int); |
1842 | break; | |
1da177e4 | 1843 | |
fef20d9c FW |
1844 | case FORMAT_TYPE_PRECISION: |
1845 | spec.precision = va_arg(args, int); | |
1846 | break; | |
1da177e4 | 1847 | |
d4be151b AGR |
1848 | case FORMAT_TYPE_CHAR: { |
1849 | char c; | |
1850 | ||
fef20d9c FW |
1851 | if (!(spec.flags & LEFT)) { |
1852 | while (--spec.field_width > 0) { | |
f796937a | 1853 | if (str < end) |
1da177e4 LT |
1854 | *str = ' '; |
1855 | ++str; | |
1da177e4 | 1856 | |
fef20d9c FW |
1857 | } |
1858 | } | |
1859 | c = (unsigned char) va_arg(args, int); | |
1860 | if (str < end) | |
1861 | *str = c; | |
1862 | ++str; | |
1863 | while (--spec.field_width > 0) { | |
f796937a | 1864 | if (str < end) |
fef20d9c | 1865 | *str = ' '; |
1da177e4 | 1866 | ++str; |
fef20d9c FW |
1867 | } |
1868 | break; | |
d4be151b | 1869 | } |
1da177e4 | 1870 | |
fef20d9c FW |
1871 | case FORMAT_TYPE_STR: |
1872 | str = string(str, end, va_arg(args, char *), spec); | |
1873 | break; | |
1da177e4 | 1874 | |
fef20d9c | 1875 | case FORMAT_TYPE_PTR: |
ffbfed03 | 1876 | str = pointer(fmt, str, end, va_arg(args, void *), |
fef20d9c FW |
1877 | spec); |
1878 | while (isalnum(*fmt)) | |
1879 | fmt++; | |
1880 | break; | |
1da177e4 | 1881 | |
fef20d9c FW |
1882 | case FORMAT_TYPE_PERCENT_CHAR: |
1883 | if (str < end) | |
1884 | *str = '%'; | |
1885 | ++str; | |
1886 | break; | |
1da177e4 | 1887 | |
fef20d9c FW |
1888 | case FORMAT_TYPE_INVALID: |
1889 | if (str < end) | |
1890 | *str = '%'; | |
1891 | ++str; | |
fef20d9c FW |
1892 | break; |
1893 | ||
fef20d9c FW |
1894 | default: |
1895 | switch (spec.type) { | |
1896 | case FORMAT_TYPE_LONG_LONG: | |
1897 | num = va_arg(args, long long); | |
1898 | break; | |
1899 | case FORMAT_TYPE_ULONG: | |
1900 | num = va_arg(args, unsigned long); | |
1901 | break; | |
1902 | case FORMAT_TYPE_LONG: | |
1903 | num = va_arg(args, long); | |
1904 | break; | |
1905 | case FORMAT_TYPE_SIZE_T: | |
ef124960 JG |
1906 | if (spec.flags & SIGN) |
1907 | num = va_arg(args, ssize_t); | |
1908 | else | |
1909 | num = va_arg(args, size_t); | |
fef20d9c FW |
1910 | break; |
1911 | case FORMAT_TYPE_PTRDIFF: | |
1912 | num = va_arg(args, ptrdiff_t); | |
1913 | break; | |
a4e94ef0 Z |
1914 | case FORMAT_TYPE_UBYTE: |
1915 | num = (unsigned char) va_arg(args, int); | |
1916 | break; | |
1917 | case FORMAT_TYPE_BYTE: | |
1918 | num = (signed char) va_arg(args, int); | |
1919 | break; | |
fef20d9c FW |
1920 | case FORMAT_TYPE_USHORT: |
1921 | num = (unsigned short) va_arg(args, int); | |
1922 | break; | |
1923 | case FORMAT_TYPE_SHORT: | |
1924 | num = (short) va_arg(args, int); | |
1925 | break; | |
39e874f8 FW |
1926 | case FORMAT_TYPE_INT: |
1927 | num = (int) va_arg(args, int); | |
fef20d9c FW |
1928 | break; |
1929 | default: | |
1930 | num = va_arg(args, unsigned int); | |
1931 | } | |
1932 | ||
1933 | str = number(str, end, num, spec); | |
1da177e4 | 1934 | } |
1da177e4 | 1935 | } |
fef20d9c | 1936 | |
f796937a JF |
1937 | if (size > 0) { |
1938 | if (str < end) | |
1939 | *str = '\0'; | |
1940 | else | |
0a6047ee | 1941 | end[-1] = '\0'; |
f796937a | 1942 | } |
fef20d9c | 1943 | |
f796937a | 1944 | /* the trailing null byte doesn't count towards the total */ |
1da177e4 | 1945 | return str-buf; |
fef20d9c | 1946 | |
1da177e4 | 1947 | } |
1da177e4 LT |
1948 | EXPORT_SYMBOL(vsnprintf); |
1949 | ||
1950 | /** | |
1951 | * vscnprintf - Format a string and place it in a buffer | |
1952 | * @buf: The buffer to place the result into | |
1953 | * @size: The size of the buffer, including the trailing null space | |
1954 | * @fmt: The format string to use | |
1955 | * @args: Arguments for the format string | |
1956 | * | |
1957 | * The return value is the number of characters which have been written into | |
b921c69f | 1958 | * the @buf not including the trailing '\0'. If @size is == 0 the function |
1da177e4 LT |
1959 | * returns 0. |
1960 | * | |
ba1835eb | 1961 | * If you're not already dealing with a va_list consider using scnprintf(). |
20036fdc AK |
1962 | * |
1963 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1964 | */ |
1965 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1966 | { | |
1967 | int i; | |
1968 | ||
7b9186f5 AGR |
1969 | i = vsnprintf(buf, size, fmt, args); |
1970 | ||
b921c69f AA |
1971 | if (likely(i < size)) |
1972 | return i; | |
1973 | if (size != 0) | |
1974 | return size - 1; | |
1975 | return 0; | |
1da177e4 | 1976 | } |
1da177e4 LT |
1977 | EXPORT_SYMBOL(vscnprintf); |
1978 | ||
1979 | /** | |
1980 | * snprintf - Format a string and place it in a buffer | |
1981 | * @buf: The buffer to place the result into | |
1982 | * @size: The size of the buffer, including the trailing null space | |
1983 | * @fmt: The format string to use | |
1984 | * @...: Arguments for the format string | |
1985 | * | |
1986 | * The return value is the number of characters which would be | |
1987 | * generated for the given input, excluding the trailing null, | |
1988 | * as per ISO C99. If the return is greater than or equal to | |
1989 | * @size, the resulting string is truncated. | |
20036fdc AK |
1990 | * |
1991 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 1992 | */ |
7b9186f5 | 1993 | int snprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
1994 | { |
1995 | va_list args; | |
1996 | int i; | |
1997 | ||
1998 | va_start(args, fmt); | |
7b9186f5 | 1999 | i = vsnprintf(buf, size, fmt, args); |
1da177e4 | 2000 | va_end(args); |
7b9186f5 | 2001 | |
1da177e4 LT |
2002 | return i; |
2003 | } | |
1da177e4 LT |
2004 | EXPORT_SYMBOL(snprintf); |
2005 | ||
2006 | /** | |
2007 | * scnprintf - Format a string and place it in a buffer | |
2008 | * @buf: The buffer to place the result into | |
2009 | * @size: The size of the buffer, including the trailing null space | |
2010 | * @fmt: The format string to use | |
2011 | * @...: Arguments for the format string | |
2012 | * | |
2013 | * The return value is the number of characters written into @buf not including | |
b903c0b8 | 2014 | * the trailing '\0'. If @size is == 0 the function returns 0. |
1da177e4 LT |
2015 | */ |
2016 | ||
7b9186f5 | 2017 | int scnprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
2018 | { |
2019 | va_list args; | |
2020 | int i; | |
2021 | ||
2022 | va_start(args, fmt); | |
b921c69f | 2023 | i = vscnprintf(buf, size, fmt, args); |
1da177e4 | 2024 | va_end(args); |
7b9186f5 | 2025 | |
b921c69f | 2026 | return i; |
1da177e4 LT |
2027 | } |
2028 | EXPORT_SYMBOL(scnprintf); | |
2029 | ||
2030 | /** | |
2031 | * vsprintf - Format a string and place it in a buffer | |
2032 | * @buf: The buffer to place the result into | |
2033 | * @fmt: The format string to use | |
2034 | * @args: Arguments for the format string | |
2035 | * | |
2036 | * The function returns the number of characters written | |
72fd4a35 | 2037 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
2038 | * buffer overflows. |
2039 | * | |
ba1835eb | 2040 | * If you're not already dealing with a va_list consider using sprintf(). |
20036fdc AK |
2041 | * |
2042 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
2043 | */ |
2044 | int vsprintf(char *buf, const char *fmt, va_list args) | |
2045 | { | |
2046 | return vsnprintf(buf, INT_MAX, fmt, args); | |
2047 | } | |
1da177e4 LT |
2048 | EXPORT_SYMBOL(vsprintf); |
2049 | ||
2050 | /** | |
2051 | * sprintf - Format a string and place it in a buffer | |
2052 | * @buf: The buffer to place the result into | |
2053 | * @fmt: The format string to use | |
2054 | * @...: Arguments for the format string | |
2055 | * | |
2056 | * The function returns the number of characters written | |
72fd4a35 | 2057 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 | 2058 | * buffer overflows. |
20036fdc AK |
2059 | * |
2060 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 2061 | */ |
7b9186f5 | 2062 | int sprintf(char *buf, const char *fmt, ...) |
1da177e4 LT |
2063 | { |
2064 | va_list args; | |
2065 | int i; | |
2066 | ||
2067 | va_start(args, fmt); | |
7b9186f5 | 2068 | i = vsnprintf(buf, INT_MAX, fmt, args); |
1da177e4 | 2069 | va_end(args); |
7b9186f5 | 2070 | |
1da177e4 LT |
2071 | return i; |
2072 | } | |
1da177e4 LT |
2073 | EXPORT_SYMBOL(sprintf); |
2074 | ||
4370aa4a LJ |
2075 | #ifdef CONFIG_BINARY_PRINTF |
2076 | /* | |
2077 | * bprintf service: | |
2078 | * vbin_printf() - VA arguments to binary data | |
2079 | * bstr_printf() - Binary data to text string | |
2080 | */ | |
2081 | ||
2082 | /** | |
2083 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
2084 | * @bin_buf: The buffer to place args' binary value | |
2085 | * @size: The size of the buffer(by words(32bits), not characters) | |
2086 | * @fmt: The format string to use | |
2087 | * @args: Arguments for the format string | |
2088 | * | |
2089 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
da3dae54 | 2090 | * is skipped. |
4370aa4a LJ |
2091 | * |
2092 | * The return value is the number of words(32bits) which would be generated for | |
2093 | * the given input. | |
2094 | * | |
2095 | * NOTE: | |
2096 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
2097 | * valid for bstr_printf(). | |
2098 | */ | |
2099 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
2100 | { | |
fef20d9c | 2101 | struct printf_spec spec = {0}; |
4370aa4a | 2102 | char *str, *end; |
4370aa4a LJ |
2103 | |
2104 | str = (char *)bin_buf; | |
2105 | end = (char *)(bin_buf + size); | |
2106 | ||
2107 | #define save_arg(type) \ | |
2108 | do { \ | |
2109 | if (sizeof(type) == 8) { \ | |
2110 | unsigned long long value; \ | |
2111 | str = PTR_ALIGN(str, sizeof(u32)); \ | |
2112 | value = va_arg(args, unsigned long long); \ | |
2113 | if (str + sizeof(type) <= end) { \ | |
2114 | *(u32 *)str = *(u32 *)&value; \ | |
2115 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ | |
2116 | } \ | |
2117 | } else { \ | |
2118 | unsigned long value; \ | |
2119 | str = PTR_ALIGN(str, sizeof(type)); \ | |
2120 | value = va_arg(args, int); \ | |
2121 | if (str + sizeof(type) <= end) \ | |
2122 | *(typeof(type) *)str = (type)value; \ | |
2123 | } \ | |
2124 | str += sizeof(type); \ | |
2125 | } while (0) | |
2126 | ||
fef20d9c | 2127 | while (*fmt) { |
d4be151b | 2128 | int read = format_decode(fmt, &spec); |
4370aa4a | 2129 | |
fef20d9c | 2130 | fmt += read; |
4370aa4a | 2131 | |
fef20d9c FW |
2132 | switch (spec.type) { |
2133 | case FORMAT_TYPE_NONE: | |
d4be151b AGR |
2134 | case FORMAT_TYPE_INVALID: |
2135 | case FORMAT_TYPE_PERCENT_CHAR: | |
fef20d9c FW |
2136 | break; |
2137 | ||
ed681a91 | 2138 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
2139 | case FORMAT_TYPE_PRECISION: |
2140 | save_arg(int); | |
2141 | break; | |
2142 | ||
2143 | case FORMAT_TYPE_CHAR: | |
4370aa4a | 2144 | save_arg(char); |
fef20d9c FW |
2145 | break; |
2146 | ||
2147 | case FORMAT_TYPE_STR: { | |
4370aa4a LJ |
2148 | const char *save_str = va_arg(args, char *); |
2149 | size_t len; | |
6c356634 | 2150 | |
4370aa4a LJ |
2151 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE |
2152 | || (unsigned long)save_str < PAGE_SIZE) | |
0f4f81dc | 2153 | save_str = "(null)"; |
6c356634 AGR |
2154 | len = strlen(save_str) + 1; |
2155 | if (str + len < end) | |
2156 | memcpy(str, save_str, len); | |
2157 | str += len; | |
fef20d9c | 2158 | break; |
4370aa4a | 2159 | } |
fef20d9c FW |
2160 | |
2161 | case FORMAT_TYPE_PTR: | |
4370aa4a LJ |
2162 | save_arg(void *); |
2163 | /* skip all alphanumeric pointer suffixes */ | |
fef20d9c | 2164 | while (isalnum(*fmt)) |
4370aa4a | 2165 | fmt++; |
fef20d9c FW |
2166 | break; |
2167 | ||
fef20d9c FW |
2168 | default: |
2169 | switch (spec.type) { | |
2170 | ||
2171 | case FORMAT_TYPE_LONG_LONG: | |
4370aa4a | 2172 | save_arg(long long); |
fef20d9c FW |
2173 | break; |
2174 | case FORMAT_TYPE_ULONG: | |
2175 | case FORMAT_TYPE_LONG: | |
4370aa4a | 2176 | save_arg(unsigned long); |
fef20d9c FW |
2177 | break; |
2178 | case FORMAT_TYPE_SIZE_T: | |
4370aa4a | 2179 | save_arg(size_t); |
fef20d9c FW |
2180 | break; |
2181 | case FORMAT_TYPE_PTRDIFF: | |
4370aa4a | 2182 | save_arg(ptrdiff_t); |
fef20d9c | 2183 | break; |
a4e94ef0 Z |
2184 | case FORMAT_TYPE_UBYTE: |
2185 | case FORMAT_TYPE_BYTE: | |
2186 | save_arg(char); | |
2187 | break; | |
fef20d9c FW |
2188 | case FORMAT_TYPE_USHORT: |
2189 | case FORMAT_TYPE_SHORT: | |
4370aa4a | 2190 | save_arg(short); |
fef20d9c FW |
2191 | break; |
2192 | default: | |
4370aa4a | 2193 | save_arg(int); |
fef20d9c | 2194 | } |
4370aa4a LJ |
2195 | } |
2196 | } | |
fef20d9c | 2197 | |
7b9186f5 | 2198 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
fef20d9c | 2199 | #undef save_arg |
4370aa4a LJ |
2200 | } |
2201 | EXPORT_SYMBOL_GPL(vbin_printf); | |
2202 | ||
2203 | /** | |
2204 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
2205 | * @buf: The buffer to place the result into | |
2206 | * @size: The size of the buffer, including the trailing null space | |
2207 | * @fmt: The format string to use | |
2208 | * @bin_buf: Binary arguments for the format string | |
2209 | * | |
2210 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
2211 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
2212 | * a binary buffer that generated by vbin_printf. | |
2213 | * | |
2214 | * The format follows C99 vsnprintf, but has some extensions: | |
0efb4d20 | 2215 | * see vsnprintf comment for details. |
4370aa4a LJ |
2216 | * |
2217 | * The return value is the number of characters which would | |
2218 | * be generated for the given input, excluding the trailing | |
2219 | * '\0', as per ISO C99. If you want to have the exact | |
2220 | * number of characters written into @buf as return value | |
2221 | * (not including the trailing '\0'), use vscnprintf(). If the | |
2222 | * return is greater than or equal to @size, the resulting | |
2223 | * string is truncated. | |
2224 | */ | |
2225 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
2226 | { | |
fef20d9c | 2227 | struct printf_spec spec = {0}; |
d4be151b AGR |
2228 | char *str, *end; |
2229 | const char *args = (const char *)bin_buf; | |
4370aa4a | 2230 | |
2f30b1f9 | 2231 | if (WARN_ON_ONCE((int) size < 0)) |
4370aa4a | 2232 | return 0; |
4370aa4a LJ |
2233 | |
2234 | str = buf; | |
2235 | end = buf + size; | |
2236 | ||
2237 | #define get_arg(type) \ | |
2238 | ({ \ | |
2239 | typeof(type) value; \ | |
2240 | if (sizeof(type) == 8) { \ | |
2241 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
2242 | *(u32 *)&value = *(u32 *)args; \ | |
2243 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
2244 | } else { \ | |
2245 | args = PTR_ALIGN(args, sizeof(type)); \ | |
2246 | value = *(typeof(type) *)args; \ | |
2247 | } \ | |
2248 | args += sizeof(type); \ | |
2249 | value; \ | |
2250 | }) | |
2251 | ||
2252 | /* Make sure end is always >= buf */ | |
2253 | if (end < buf) { | |
2254 | end = ((void *)-1); | |
2255 | size = end - buf; | |
2256 | } | |
2257 | ||
fef20d9c | 2258 | while (*fmt) { |
fef20d9c | 2259 | const char *old_fmt = fmt; |
d4be151b | 2260 | int read = format_decode(fmt, &spec); |
4370aa4a | 2261 | |
fef20d9c | 2262 | fmt += read; |
4370aa4a | 2263 | |
fef20d9c FW |
2264 | switch (spec.type) { |
2265 | case FORMAT_TYPE_NONE: { | |
2266 | int copy = read; | |
2267 | if (str < end) { | |
2268 | if (copy > end - str) | |
2269 | copy = end - str; | |
2270 | memcpy(str, old_fmt, copy); | |
4370aa4a | 2271 | } |
fef20d9c FW |
2272 | str += read; |
2273 | break; | |
4370aa4a LJ |
2274 | } |
2275 | ||
ed681a91 | 2276 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
2277 | spec.field_width = get_arg(int); |
2278 | break; | |
4370aa4a | 2279 | |
fef20d9c FW |
2280 | case FORMAT_TYPE_PRECISION: |
2281 | spec.precision = get_arg(int); | |
2282 | break; | |
4370aa4a | 2283 | |
d4be151b AGR |
2284 | case FORMAT_TYPE_CHAR: { |
2285 | char c; | |
2286 | ||
fef20d9c FW |
2287 | if (!(spec.flags & LEFT)) { |
2288 | while (--spec.field_width > 0) { | |
4370aa4a LJ |
2289 | if (str < end) |
2290 | *str = ' '; | |
2291 | ++str; | |
2292 | } | |
2293 | } | |
2294 | c = (unsigned char) get_arg(char); | |
2295 | if (str < end) | |
2296 | *str = c; | |
2297 | ++str; | |
fef20d9c | 2298 | while (--spec.field_width > 0) { |
4370aa4a LJ |
2299 | if (str < end) |
2300 | *str = ' '; | |
2301 | ++str; | |
2302 | } | |
fef20d9c | 2303 | break; |
d4be151b | 2304 | } |
4370aa4a | 2305 | |
fef20d9c | 2306 | case FORMAT_TYPE_STR: { |
4370aa4a | 2307 | const char *str_arg = args; |
d4be151b | 2308 | args += strlen(str_arg) + 1; |
fef20d9c FW |
2309 | str = string(str, end, (char *)str_arg, spec); |
2310 | break; | |
4370aa4a LJ |
2311 | } |
2312 | ||
fef20d9c | 2313 | case FORMAT_TYPE_PTR: |
ffbfed03 | 2314 | str = pointer(fmt, str, end, get_arg(void *), spec); |
fef20d9c | 2315 | while (isalnum(*fmt)) |
4370aa4a | 2316 | fmt++; |
fef20d9c | 2317 | break; |
4370aa4a | 2318 | |
fef20d9c | 2319 | case FORMAT_TYPE_PERCENT_CHAR: |
fef20d9c | 2320 | case FORMAT_TYPE_INVALID: |
4370aa4a LJ |
2321 | if (str < end) |
2322 | *str = '%'; | |
2323 | ++str; | |
fef20d9c FW |
2324 | break; |
2325 | ||
d4be151b AGR |
2326 | default: { |
2327 | unsigned long long num; | |
2328 | ||
fef20d9c FW |
2329 | switch (spec.type) { |
2330 | ||
2331 | case FORMAT_TYPE_LONG_LONG: | |
2332 | num = get_arg(long long); | |
2333 | break; | |
2334 | case FORMAT_TYPE_ULONG: | |
fef20d9c FW |
2335 | case FORMAT_TYPE_LONG: |
2336 | num = get_arg(unsigned long); | |
2337 | break; | |
2338 | case FORMAT_TYPE_SIZE_T: | |
2339 | num = get_arg(size_t); | |
2340 | break; | |
2341 | case FORMAT_TYPE_PTRDIFF: | |
2342 | num = get_arg(ptrdiff_t); | |
2343 | break; | |
a4e94ef0 Z |
2344 | case FORMAT_TYPE_UBYTE: |
2345 | num = get_arg(unsigned char); | |
2346 | break; | |
2347 | case FORMAT_TYPE_BYTE: | |
2348 | num = get_arg(signed char); | |
2349 | break; | |
fef20d9c FW |
2350 | case FORMAT_TYPE_USHORT: |
2351 | num = get_arg(unsigned short); | |
2352 | break; | |
2353 | case FORMAT_TYPE_SHORT: | |
2354 | num = get_arg(short); | |
2355 | break; | |
2356 | case FORMAT_TYPE_UINT: | |
2357 | num = get_arg(unsigned int); | |
2358 | break; | |
2359 | default: | |
2360 | num = get_arg(int); | |
2361 | } | |
2362 | ||
2363 | str = number(str, end, num, spec); | |
d4be151b AGR |
2364 | } /* default: */ |
2365 | } /* switch(spec.type) */ | |
2366 | } /* while(*fmt) */ | |
fef20d9c | 2367 | |
4370aa4a LJ |
2368 | if (size > 0) { |
2369 | if (str < end) | |
2370 | *str = '\0'; | |
2371 | else | |
2372 | end[-1] = '\0'; | |
2373 | } | |
fef20d9c | 2374 | |
4370aa4a LJ |
2375 | #undef get_arg |
2376 | ||
2377 | /* the trailing null byte doesn't count towards the total */ | |
2378 | return str - buf; | |
2379 | } | |
2380 | EXPORT_SYMBOL_GPL(bstr_printf); | |
2381 | ||
2382 | /** | |
2383 | * bprintf - Parse a format string and place args' binary value in a buffer | |
2384 | * @bin_buf: The buffer to place args' binary value | |
2385 | * @size: The size of the buffer(by words(32bits), not characters) | |
2386 | * @fmt: The format string to use | |
2387 | * @...: Arguments for the format string | |
2388 | * | |
2389 | * The function returns the number of words(u32) written | |
2390 | * into @bin_buf. | |
2391 | */ | |
2392 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
2393 | { | |
2394 | va_list args; | |
2395 | int ret; | |
2396 | ||
2397 | va_start(args, fmt); | |
2398 | ret = vbin_printf(bin_buf, size, fmt, args); | |
2399 | va_end(args); | |
7b9186f5 | 2400 | |
4370aa4a LJ |
2401 | return ret; |
2402 | } | |
2403 | EXPORT_SYMBOL_GPL(bprintf); | |
2404 | ||
2405 | #endif /* CONFIG_BINARY_PRINTF */ | |
2406 | ||
1da177e4 LT |
2407 | /** |
2408 | * vsscanf - Unformat a buffer into a list of arguments | |
2409 | * @buf: input buffer | |
2410 | * @fmt: format of buffer | |
2411 | * @args: arguments | |
2412 | */ | |
7b9186f5 | 2413 | int vsscanf(const char *buf, const char *fmt, va_list args) |
1da177e4 LT |
2414 | { |
2415 | const char *str = buf; | |
2416 | char *next; | |
2417 | char digit; | |
2418 | int num = 0; | |
ef0658f3 | 2419 | u8 qualifier; |
53809751 JB |
2420 | unsigned int base; |
2421 | union { | |
2422 | long long s; | |
2423 | unsigned long long u; | |
2424 | } val; | |
ef0658f3 | 2425 | s16 field_width; |
d4be151b | 2426 | bool is_sign; |
1da177e4 | 2427 | |
da99075c | 2428 | while (*fmt) { |
1da177e4 LT |
2429 | /* skip any white space in format */ |
2430 | /* white space in format matchs any amount of | |
2431 | * white space, including none, in the input. | |
2432 | */ | |
2433 | if (isspace(*fmt)) { | |
e7d2860b AGR |
2434 | fmt = skip_spaces(++fmt); |
2435 | str = skip_spaces(str); | |
1da177e4 LT |
2436 | } |
2437 | ||
2438 | /* anything that is not a conversion must match exactly */ | |
2439 | if (*fmt != '%' && *fmt) { | |
2440 | if (*fmt++ != *str++) | |
2441 | break; | |
2442 | continue; | |
2443 | } | |
2444 | ||
2445 | if (!*fmt) | |
2446 | break; | |
2447 | ++fmt; | |
7b9186f5 | 2448 | |
1da177e4 LT |
2449 | /* skip this conversion. |
2450 | * advance both strings to next white space | |
2451 | */ | |
2452 | if (*fmt == '*') { | |
da99075c JB |
2453 | if (!*str) |
2454 | break; | |
8fccae2c | 2455 | while (!isspace(*fmt) && *fmt != '%' && *fmt) |
1da177e4 LT |
2456 | fmt++; |
2457 | while (!isspace(*str) && *str) | |
2458 | str++; | |
2459 | continue; | |
2460 | } | |
2461 | ||
2462 | /* get field width */ | |
2463 | field_width = -1; | |
53809751 | 2464 | if (isdigit(*fmt)) { |
1da177e4 | 2465 | field_width = skip_atoi(&fmt); |
53809751 JB |
2466 | if (field_width <= 0) |
2467 | break; | |
2468 | } | |
1da177e4 LT |
2469 | |
2470 | /* get conversion qualifier */ | |
2471 | qualifier = -1; | |
75fb8f26 AS |
2472 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
2473 | _tolower(*fmt) == 'z') { | |
1da177e4 LT |
2474 | qualifier = *fmt++; |
2475 | if (unlikely(qualifier == *fmt)) { | |
2476 | if (qualifier == 'h') { | |
2477 | qualifier = 'H'; | |
2478 | fmt++; | |
2479 | } else if (qualifier == 'l') { | |
2480 | qualifier = 'L'; | |
2481 | fmt++; | |
2482 | } | |
2483 | } | |
2484 | } | |
1da177e4 | 2485 | |
da99075c JB |
2486 | if (!*fmt) |
2487 | break; | |
2488 | ||
2489 | if (*fmt == 'n') { | |
2490 | /* return number of characters read so far */ | |
2491 | *va_arg(args, int *) = str - buf; | |
2492 | ++fmt; | |
2493 | continue; | |
2494 | } | |
2495 | ||
2496 | if (!*str) | |
1da177e4 LT |
2497 | break; |
2498 | ||
d4be151b | 2499 | base = 10; |
3f623eba | 2500 | is_sign = false; |
d4be151b | 2501 | |
7b9186f5 | 2502 | switch (*fmt++) { |
1da177e4 LT |
2503 | case 'c': |
2504 | { | |
7b9186f5 | 2505 | char *s = (char *)va_arg(args, char*); |
1da177e4 LT |
2506 | if (field_width == -1) |
2507 | field_width = 1; | |
2508 | do { | |
2509 | *s++ = *str++; | |
2510 | } while (--field_width > 0 && *str); | |
2511 | num++; | |
2512 | } | |
2513 | continue; | |
2514 | case 's': | |
2515 | { | |
7b9186f5 AGR |
2516 | char *s = (char *)va_arg(args, char *); |
2517 | if (field_width == -1) | |
4be929be | 2518 | field_width = SHRT_MAX; |
1da177e4 | 2519 | /* first, skip leading white space in buffer */ |
e7d2860b | 2520 | str = skip_spaces(str); |
1da177e4 LT |
2521 | |
2522 | /* now copy until next white space */ | |
7b9186f5 | 2523 | while (*str && !isspace(*str) && field_width--) |
1da177e4 | 2524 | *s++ = *str++; |
1da177e4 LT |
2525 | *s = '\0'; |
2526 | num++; | |
2527 | } | |
2528 | continue; | |
1da177e4 LT |
2529 | case 'o': |
2530 | base = 8; | |
2531 | break; | |
2532 | case 'x': | |
2533 | case 'X': | |
2534 | base = 16; | |
2535 | break; | |
2536 | case 'i': | |
7b9186f5 | 2537 | base = 0; |
1da177e4 | 2538 | case 'd': |
3f623eba | 2539 | is_sign = true; |
1da177e4 LT |
2540 | case 'u': |
2541 | break; | |
2542 | case '%': | |
2543 | /* looking for '%' in str */ | |
7b9186f5 | 2544 | if (*str++ != '%') |
1da177e4 LT |
2545 | return num; |
2546 | continue; | |
2547 | default: | |
2548 | /* invalid format; stop here */ | |
2549 | return num; | |
2550 | } | |
2551 | ||
2552 | /* have some sort of integer conversion. | |
2553 | * first, skip white space in buffer. | |
2554 | */ | |
e7d2860b | 2555 | str = skip_spaces(str); |
1da177e4 LT |
2556 | |
2557 | digit = *str; | |
2558 | if (is_sign && digit == '-') | |
2559 | digit = *(str + 1); | |
2560 | ||
2561 | if (!digit | |
7b9186f5 AGR |
2562 | || (base == 16 && !isxdigit(digit)) |
2563 | || (base == 10 && !isdigit(digit)) | |
2564 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
2565 | || (base == 0 && !isdigit(digit))) | |
2566 | break; | |
1da177e4 | 2567 | |
53809751 JB |
2568 | if (is_sign) |
2569 | val.s = qualifier != 'L' ? | |
2570 | simple_strtol(str, &next, base) : | |
2571 | simple_strtoll(str, &next, base); | |
2572 | else | |
2573 | val.u = qualifier != 'L' ? | |
2574 | simple_strtoul(str, &next, base) : | |
2575 | simple_strtoull(str, &next, base); | |
2576 | ||
2577 | if (field_width > 0 && next - str > field_width) { | |
2578 | if (base == 0) | |
2579 | _parse_integer_fixup_radix(str, &base); | |
2580 | while (next - str > field_width) { | |
2581 | if (is_sign) | |
2582 | val.s = div_s64(val.s, base); | |
2583 | else | |
2584 | val.u = div_u64(val.u, base); | |
2585 | --next; | |
2586 | } | |
2587 | } | |
2588 | ||
7b9186f5 | 2589 | switch (qualifier) { |
1da177e4 | 2590 | case 'H': /* that's 'hh' in format */ |
53809751 JB |
2591 | if (is_sign) |
2592 | *va_arg(args, signed char *) = val.s; | |
2593 | else | |
2594 | *va_arg(args, unsigned char *) = val.u; | |
1da177e4 LT |
2595 | break; |
2596 | case 'h': | |
53809751 JB |
2597 | if (is_sign) |
2598 | *va_arg(args, short *) = val.s; | |
2599 | else | |
2600 | *va_arg(args, unsigned short *) = val.u; | |
1da177e4 LT |
2601 | break; |
2602 | case 'l': | |
53809751 JB |
2603 | if (is_sign) |
2604 | *va_arg(args, long *) = val.s; | |
2605 | else | |
2606 | *va_arg(args, unsigned long *) = val.u; | |
1da177e4 LT |
2607 | break; |
2608 | case 'L': | |
53809751 JB |
2609 | if (is_sign) |
2610 | *va_arg(args, long long *) = val.s; | |
2611 | else | |
2612 | *va_arg(args, unsigned long long *) = val.u; | |
1da177e4 LT |
2613 | break; |
2614 | case 'Z': | |
2615 | case 'z': | |
53809751 JB |
2616 | *va_arg(args, size_t *) = val.u; |
2617 | break; | |
1da177e4 | 2618 | default: |
53809751 JB |
2619 | if (is_sign) |
2620 | *va_arg(args, int *) = val.s; | |
2621 | else | |
2622 | *va_arg(args, unsigned int *) = val.u; | |
1da177e4 LT |
2623 | break; |
2624 | } | |
2625 | num++; | |
2626 | ||
2627 | if (!next) | |
2628 | break; | |
2629 | str = next; | |
2630 | } | |
c6b40d16 | 2631 | |
1da177e4 LT |
2632 | return num; |
2633 | } | |
1da177e4 LT |
2634 | EXPORT_SYMBOL(vsscanf); |
2635 | ||
2636 | /** | |
2637 | * sscanf - Unformat a buffer into a list of arguments | |
2638 | * @buf: input buffer | |
2639 | * @fmt: formatting of buffer | |
2640 | * @...: resulting arguments | |
2641 | */ | |
7b9186f5 | 2642 | int sscanf(const char *buf, const char *fmt, ...) |
1da177e4 LT |
2643 | { |
2644 | va_list args; | |
2645 | int i; | |
2646 | ||
7b9186f5 AGR |
2647 | va_start(args, fmt); |
2648 | i = vsscanf(buf, fmt, args); | |
1da177e4 | 2649 | va_end(args); |
7b9186f5 | 2650 | |
1da177e4 LT |
2651 | return i; |
2652 | } | |
1da177e4 | 2653 | EXPORT_SYMBOL(sscanf); |