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> | |
20 | #include <linux/module.h> | |
21 | #include <linux/types.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/ctype.h> | |
24 | #include <linux/kernel.h> | |
0fe1ef24 LT |
25 | #include <linux/kallsyms.h> |
26 | #include <linux/uaccess.h> | |
332d2e78 | 27 | #include <linux/ioport.h> |
8a27f7c9 | 28 | #include <net/addrconf.h> |
1da177e4 | 29 | |
4e57b681 | 30 | #include <asm/page.h> /* for PAGE_SIZE */ |
1da177e4 | 31 | #include <asm/div64.h> |
deac93df | 32 | #include <asm/sections.h> /* for dereference_function_descriptor() */ |
1da177e4 | 33 | |
9b706aee DV |
34 | /* Works only for digits and letters, but small and fast */ |
35 | #define TOLOWER(x) ((x) | 0x20) | |
36 | ||
aa46a63e HH |
37 | static unsigned int simple_guess_base(const char *cp) |
38 | { | |
39 | if (cp[0] == '0') { | |
40 | if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2])) | |
41 | return 16; | |
42 | else | |
43 | return 8; | |
44 | } else { | |
45 | return 10; | |
46 | } | |
47 | } | |
48 | ||
1da177e4 | 49 | /** |
922ac25c | 50 | * simple_strtoull - convert a string to an unsigned long long |
1da177e4 LT |
51 | * @cp: The start of the string |
52 | * @endp: A pointer to the end of the parsed string will be placed here | |
53 | * @base: The number base to use | |
54 | */ | |
922ac25c | 55 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
1da177e4 | 56 | { |
922ac25c | 57 | unsigned long long result = 0; |
aa46a63e HH |
58 | |
59 | if (!base) | |
60 | base = simple_guess_base(cp); | |
61 | ||
62 | if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x') | |
63 | cp += 2; | |
64 | ||
65 | while (isxdigit(*cp)) { | |
66 | unsigned int value; | |
67 | ||
68 | value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10; | |
69 | if (value >= base) | |
70 | break; | |
71 | result = result * base + value; | |
1da177e4 LT |
72 | cp++; |
73 | } | |
74 | if (endp) | |
75 | *endp = (char *)cp; | |
7b9186f5 | 76 | |
1da177e4 LT |
77 | return result; |
78 | } | |
922ac25c | 79 | EXPORT_SYMBOL(simple_strtoull); |
1da177e4 LT |
80 | |
81 | /** | |
922ac25c | 82 | * simple_strtoul - convert a string to an unsigned long |
1da177e4 LT |
83 | * @cp: The start of the string |
84 | * @endp: A pointer to the end of the parsed string will be placed here | |
85 | * @base: The number base to use | |
86 | */ | |
922ac25c | 87 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
1da177e4 | 88 | { |
922ac25c | 89 | return simple_strtoull(cp, endp, base); |
1da177e4 | 90 | } |
922ac25c | 91 | EXPORT_SYMBOL(simple_strtoul); |
1da177e4 LT |
92 | |
93 | /** | |
922ac25c | 94 | * simple_strtol - convert a string to a signed long |
1da177e4 LT |
95 | * @cp: The start of the string |
96 | * @endp: A pointer to the end of the parsed string will be placed here | |
97 | * @base: The number base to use | |
98 | */ | |
922ac25c | 99 | long simple_strtol(const char *cp, char **endp, unsigned int base) |
1da177e4 | 100 | { |
922ac25c AGR |
101 | if (*cp == '-') |
102 | return -simple_strtoul(cp + 1, endp, base); | |
7b9186f5 | 103 | |
922ac25c | 104 | return simple_strtoul(cp, endp, base); |
1da177e4 | 105 | } |
922ac25c | 106 | EXPORT_SYMBOL(simple_strtol); |
1da177e4 LT |
107 | |
108 | /** | |
109 | * simple_strtoll - convert a string to a signed long long | |
110 | * @cp: The start of the string | |
111 | * @endp: A pointer to the end of the parsed string will be placed here | |
112 | * @base: The number base to use | |
113 | */ | |
22d27051 | 114 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
1da177e4 | 115 | { |
7b9186f5 | 116 | if (*cp == '-') |
22d27051 | 117 | return -simple_strtoull(cp + 1, endp, base); |
7b9186f5 | 118 | |
22d27051 | 119 | return simple_strtoull(cp, endp, base); |
1da177e4 LT |
120 | } |
121 | ||
06b2a76d YY |
122 | /** |
123 | * strict_strtoul - convert a string to an unsigned long strictly | |
124 | * @cp: The string to be converted | |
125 | * @base: The number base to use | |
126 | * @res: The converted result value | |
127 | * | |
128 | * strict_strtoul converts a string to an unsigned long only if the | |
129 | * string is really an unsigned long string, any string containing | |
130 | * any invalid char at the tail will be rejected and -EINVAL is returned, | |
131 | * only a newline char at the tail is acceptible because people generally | |
132 | * change a module parameter in the following way: | |
133 | * | |
134 | * echo 1024 > /sys/module/e1000/parameters/copybreak | |
135 | * | |
136 | * echo will append a newline to the tail. | |
137 | * | |
138 | * It returns 0 if conversion is successful and *res is set to the converted | |
139 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
140 | * | |
141 | * simple_strtoul just ignores the successive invalid characters and | |
142 | * return the converted value of prefix part of the string. | |
143 | */ | |
9d85db22 HH |
144 | int strict_strtoul(const char *cp, unsigned int base, unsigned long *res) |
145 | { | |
146 | char *tail; | |
147 | unsigned long val; | |
148 | size_t len; | |
149 | ||
150 | *res = 0; | |
151 | len = strlen(cp); | |
152 | if (len == 0) | |
153 | return -EINVAL; | |
154 | ||
155 | val = simple_strtoul(cp, &tail, base); | |
e899aa82 PM |
156 | if (tail == cp) |
157 | return -EINVAL; | |
7b9186f5 | 158 | |
9d85db22 HH |
159 | if ((*tail == '\0') || |
160 | ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) { | |
161 | *res = val; | |
162 | return 0; | |
163 | } | |
164 | ||
165 | return -EINVAL; | |
166 | } | |
167 | EXPORT_SYMBOL(strict_strtoul); | |
06b2a76d YY |
168 | |
169 | /** | |
170 | * strict_strtol - convert a string to a long strictly | |
171 | * @cp: The string to be converted | |
172 | * @base: The number base to use | |
173 | * @res: The converted result value | |
174 | * | |
175 | * strict_strtol is similiar to strict_strtoul, but it allows the first | |
176 | * character of a string is '-'. | |
177 | * | |
178 | * It returns 0 if conversion is successful and *res is set to the converted | |
179 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
180 | */ | |
9d85db22 HH |
181 | int strict_strtol(const char *cp, unsigned int base, long *res) |
182 | { | |
183 | int ret; | |
184 | if (*cp == '-') { | |
185 | ret = strict_strtoul(cp + 1, base, (unsigned long *)res); | |
186 | if (!ret) | |
187 | *res = -(*res); | |
188 | } else { | |
189 | ret = strict_strtoul(cp, base, (unsigned long *)res); | |
190 | } | |
191 | ||
192 | return ret; | |
193 | } | |
194 | EXPORT_SYMBOL(strict_strtol); | |
06b2a76d YY |
195 | |
196 | /** | |
197 | * strict_strtoull - convert a string to an unsigned long long strictly | |
198 | * @cp: The string to be converted | |
199 | * @base: The number base to use | |
200 | * @res: The converted result value | |
201 | * | |
202 | * strict_strtoull converts a string to an unsigned long long only if the | |
203 | * string is really an unsigned long long string, any string containing | |
204 | * any invalid char at the tail will be rejected and -EINVAL is returned, | |
205 | * only a newline char at the tail is acceptible because people generally | |
206 | * change a module parameter in the following way: | |
207 | * | |
208 | * echo 1024 > /sys/module/e1000/parameters/copybreak | |
209 | * | |
210 | * echo will append a newline to the tail of the string. | |
211 | * | |
212 | * It returns 0 if conversion is successful and *res is set to the converted | |
213 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
214 | * | |
215 | * simple_strtoull just ignores the successive invalid characters and | |
216 | * return the converted value of prefix part of the string. | |
217 | */ | |
9d85db22 HH |
218 | int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res) |
219 | { | |
220 | char *tail; | |
221 | unsigned long long val; | |
222 | size_t len; | |
223 | ||
224 | *res = 0; | |
225 | len = strlen(cp); | |
226 | if (len == 0) | |
227 | return -EINVAL; | |
228 | ||
229 | val = simple_strtoull(cp, &tail, base); | |
e899aa82 PM |
230 | if (tail == cp) |
231 | return -EINVAL; | |
9d85db22 HH |
232 | if ((*tail == '\0') || |
233 | ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) { | |
234 | *res = val; | |
235 | return 0; | |
236 | } | |
237 | ||
238 | return -EINVAL; | |
239 | } | |
240 | EXPORT_SYMBOL(strict_strtoull); | |
06b2a76d YY |
241 | |
242 | /** | |
243 | * strict_strtoll - convert a string to a long long strictly | |
244 | * @cp: The string to be converted | |
245 | * @base: The number base to use | |
246 | * @res: The converted result value | |
247 | * | |
248 | * strict_strtoll is similiar to strict_strtoull, but it allows the first | |
249 | * character of a string is '-'. | |
250 | * | |
251 | * It returns 0 if conversion is successful and *res is set to the converted | |
252 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
253 | */ | |
9d85db22 HH |
254 | int strict_strtoll(const char *cp, unsigned int base, long long *res) |
255 | { | |
256 | int ret; | |
257 | if (*cp == '-') { | |
258 | ret = strict_strtoull(cp + 1, base, (unsigned long long *)res); | |
259 | if (!ret) | |
260 | *res = -(*res); | |
261 | } else { | |
262 | ret = strict_strtoull(cp, base, (unsigned long long *)res); | |
263 | } | |
06b2a76d | 264 | |
9d85db22 HH |
265 | return ret; |
266 | } | |
06b2a76d | 267 | EXPORT_SYMBOL(strict_strtoll); |
06b2a76d | 268 | |
1da177e4 LT |
269 | static int skip_atoi(const char **s) |
270 | { | |
7b9186f5 | 271 | int i = 0; |
1da177e4 LT |
272 | |
273 | while (isdigit(**s)) | |
274 | i = i*10 + *((*s)++) - '0'; | |
7b9186f5 | 275 | |
1da177e4 LT |
276 | return i; |
277 | } | |
278 | ||
4277eedd DV |
279 | /* Decimal conversion is by far the most typical, and is used |
280 | * for /proc and /sys data. This directly impacts e.g. top performance | |
281 | * with many processes running. We optimize it for speed | |
282 | * using code from | |
283 | * http://www.cs.uiowa.edu/~jones/bcd/decimal.html | |
284 | * (with permission from the author, Douglas W. Jones). */ | |
285 | ||
286 | /* Formats correctly any integer in [0,99999]. | |
287 | * Outputs from one to five digits depending on input. | |
288 | * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */ | |
7b9186f5 | 289 | static char *put_dec_trunc(char *buf, unsigned q) |
4277eedd DV |
290 | { |
291 | unsigned d3, d2, d1, d0; | |
292 | d1 = (q>>4) & 0xf; | |
293 | d2 = (q>>8) & 0xf; | |
294 | d3 = (q>>12); | |
295 | ||
296 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); | |
297 | q = (d0 * 0xcd) >> 11; | |
298 | d0 = d0 - 10*q; | |
299 | *buf++ = d0 + '0'; /* least significant digit */ | |
300 | d1 = q + 9*d3 + 5*d2 + d1; | |
301 | if (d1 != 0) { | |
302 | q = (d1 * 0xcd) >> 11; | |
303 | d1 = d1 - 10*q; | |
304 | *buf++ = d1 + '0'; /* next digit */ | |
305 | ||
306 | d2 = q + 2*d2; | |
307 | if ((d2 != 0) || (d3 != 0)) { | |
308 | q = (d2 * 0xd) >> 7; | |
309 | d2 = d2 - 10*q; | |
310 | *buf++ = d2 + '0'; /* next digit */ | |
311 | ||
312 | d3 = q + 4*d3; | |
313 | if (d3 != 0) { | |
314 | q = (d3 * 0xcd) >> 11; | |
315 | d3 = d3 - 10*q; | |
316 | *buf++ = d3 + '0'; /* next digit */ | |
317 | if (q != 0) | |
7b9186f5 | 318 | *buf++ = q + '0'; /* most sign. digit */ |
4277eedd DV |
319 | } |
320 | } | |
321 | } | |
7b9186f5 | 322 | |
4277eedd DV |
323 | return buf; |
324 | } | |
325 | /* Same with if's removed. Always emits five digits */ | |
7b9186f5 | 326 | static char *put_dec_full(char *buf, unsigned q) |
4277eedd DV |
327 | { |
328 | /* BTW, if q is in [0,9999], 8-bit ints will be enough, */ | |
329 | /* but anyway, gcc produces better code with full-sized ints */ | |
330 | unsigned d3, d2, d1, d0; | |
331 | d1 = (q>>4) & 0xf; | |
332 | d2 = (q>>8) & 0xf; | |
333 | d3 = (q>>12); | |
334 | ||
7b9186f5 AGR |
335 | /* |
336 | * Possible ways to approx. divide by 10 | |
337 | * gcc -O2 replaces multiply with shifts and adds | |
338 | * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386) | |
339 | * (x * 0x67) >> 10: 1100111 | |
340 | * (x * 0x34) >> 9: 110100 - same | |
341 | * (x * 0x1a) >> 8: 11010 - same | |
342 | * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386) | |
343 | */ | |
4277eedd DV |
344 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); |
345 | q = (d0 * 0xcd) >> 11; | |
346 | d0 = d0 - 10*q; | |
347 | *buf++ = d0 + '0'; | |
348 | d1 = q + 9*d3 + 5*d2 + d1; | |
349 | q = (d1 * 0xcd) >> 11; | |
350 | d1 = d1 - 10*q; | |
351 | *buf++ = d1 + '0'; | |
352 | ||
353 | d2 = q + 2*d2; | |
354 | q = (d2 * 0xd) >> 7; | |
355 | d2 = d2 - 10*q; | |
356 | *buf++ = d2 + '0'; | |
357 | ||
358 | d3 = q + 4*d3; | |
359 | q = (d3 * 0xcd) >> 11; /* - shorter code */ | |
360 | /* q = (d3 * 0x67) >> 10; - would also work */ | |
361 | d3 = d3 - 10*q; | |
362 | *buf++ = d3 + '0'; | |
363 | *buf++ = q + '0'; | |
7b9186f5 | 364 | |
4277eedd DV |
365 | return buf; |
366 | } | |
367 | /* No inlining helps gcc to use registers better */ | |
7b9186f5 | 368 | static noinline char *put_dec(char *buf, unsigned long long num) |
4277eedd DV |
369 | { |
370 | while (1) { | |
371 | unsigned rem; | |
372 | if (num < 100000) | |
373 | return put_dec_trunc(buf, num); | |
374 | rem = do_div(num, 100000); | |
375 | buf = put_dec_full(buf, rem); | |
376 | } | |
377 | } | |
378 | ||
1da177e4 LT |
379 | #define ZEROPAD 1 /* pad with zero */ |
380 | #define SIGN 2 /* unsigned/signed long */ | |
381 | #define PLUS 4 /* show plus */ | |
382 | #define SPACE 8 /* space if plus */ | |
383 | #define LEFT 16 /* left justified */ | |
b89dc5d6 BH |
384 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ |
385 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ | |
1da177e4 | 386 | |
fef20d9c FW |
387 | enum format_type { |
388 | FORMAT_TYPE_NONE, /* Just a string part */ | |
ed681a91 | 389 | FORMAT_TYPE_WIDTH, |
fef20d9c FW |
390 | FORMAT_TYPE_PRECISION, |
391 | FORMAT_TYPE_CHAR, | |
392 | FORMAT_TYPE_STR, | |
393 | FORMAT_TYPE_PTR, | |
394 | FORMAT_TYPE_PERCENT_CHAR, | |
395 | FORMAT_TYPE_INVALID, | |
396 | FORMAT_TYPE_LONG_LONG, | |
397 | FORMAT_TYPE_ULONG, | |
398 | FORMAT_TYPE_LONG, | |
a4e94ef0 Z |
399 | FORMAT_TYPE_UBYTE, |
400 | FORMAT_TYPE_BYTE, | |
fef20d9c FW |
401 | FORMAT_TYPE_USHORT, |
402 | FORMAT_TYPE_SHORT, | |
403 | FORMAT_TYPE_UINT, | |
404 | FORMAT_TYPE_INT, | |
405 | FORMAT_TYPE_NRCHARS, | |
406 | FORMAT_TYPE_SIZE_T, | |
407 | FORMAT_TYPE_PTRDIFF | |
408 | }; | |
409 | ||
410 | struct printf_spec { | |
ef0658f3 JP |
411 | u16 type; |
412 | s16 field_width; /* width of output field */ | |
413 | u8 flags; /* flags to number() */ | |
414 | u8 base; | |
415 | s8 precision; /* # of digits/chars */ | |
416 | u8 qualifier; | |
fef20d9c FW |
417 | }; |
418 | ||
419 | static char *number(char *buf, char *end, unsigned long long num, | |
420 | struct printf_spec spec) | |
1da177e4 | 421 | { |
9b706aee DV |
422 | /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ |
423 | static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ | |
424 | ||
425 | char tmp[66]; | |
426 | char sign; | |
427 | char locase; | |
fef20d9c | 428 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
1da177e4 LT |
429 | int i; |
430 | ||
9b706aee DV |
431 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
432 | * produces same digits or (maybe lowercased) letters */ | |
fef20d9c FW |
433 | locase = (spec.flags & SMALL); |
434 | if (spec.flags & LEFT) | |
435 | spec.flags &= ~ZEROPAD; | |
1da177e4 | 436 | sign = 0; |
fef20d9c | 437 | if (spec.flags & SIGN) { |
7b9186f5 | 438 | if ((signed long long)num < 0) { |
1da177e4 | 439 | sign = '-'; |
7b9186f5 | 440 | num = -(signed long long)num; |
fef20d9c FW |
441 | spec.field_width--; |
442 | } else if (spec.flags & PLUS) { | |
1da177e4 | 443 | sign = '+'; |
fef20d9c FW |
444 | spec.field_width--; |
445 | } else if (spec.flags & SPACE) { | |
1da177e4 | 446 | sign = ' '; |
fef20d9c | 447 | spec.field_width--; |
1da177e4 LT |
448 | } |
449 | } | |
b39a7340 | 450 | if (need_pfx) { |
fef20d9c FW |
451 | spec.field_width--; |
452 | if (spec.base == 16) | |
453 | spec.field_width--; | |
1da177e4 | 454 | } |
b39a7340 DV |
455 | |
456 | /* generate full string in tmp[], in reverse order */ | |
1da177e4 LT |
457 | i = 0; |
458 | if (num == 0) | |
b39a7340 | 459 | tmp[i++] = '0'; |
4277eedd DV |
460 | /* Generic code, for any base: |
461 | else do { | |
9b706aee | 462 | tmp[i++] = (digits[do_div(num,base)] | locase); |
4277eedd DV |
463 | } while (num != 0); |
464 | */ | |
fef20d9c FW |
465 | else if (spec.base != 10) { /* 8 or 16 */ |
466 | int mask = spec.base - 1; | |
b39a7340 | 467 | int shift = 3; |
7b9186f5 AGR |
468 | |
469 | if (spec.base == 16) | |
470 | shift = 4; | |
b39a7340 | 471 | do { |
9b706aee | 472 | tmp[i++] = (digits[((unsigned char)num) & mask] | locase); |
b39a7340 DV |
473 | num >>= shift; |
474 | } while (num); | |
4277eedd DV |
475 | } else { /* base 10 */ |
476 | i = put_dec(tmp, num) - tmp; | |
477 | } | |
b39a7340 DV |
478 | |
479 | /* printing 100 using %2d gives "100", not "00" */ | |
fef20d9c FW |
480 | if (i > spec.precision) |
481 | spec.precision = i; | |
b39a7340 | 482 | /* leading space padding */ |
fef20d9c FW |
483 | spec.field_width -= spec.precision; |
484 | if (!(spec.flags & (ZEROPAD+LEFT))) { | |
7b9186f5 | 485 | while (--spec.field_width >= 0) { |
f796937a | 486 | if (buf < end) |
1da177e4 LT |
487 | *buf = ' '; |
488 | ++buf; | |
489 | } | |
490 | } | |
b39a7340 | 491 | /* sign */ |
1da177e4 | 492 | if (sign) { |
f796937a | 493 | if (buf < end) |
1da177e4 LT |
494 | *buf = sign; |
495 | ++buf; | |
496 | } | |
b39a7340 DV |
497 | /* "0x" / "0" prefix */ |
498 | if (need_pfx) { | |
499 | if (buf < end) | |
500 | *buf = '0'; | |
501 | ++buf; | |
fef20d9c | 502 | if (spec.base == 16) { |
f796937a | 503 | if (buf < end) |
9b706aee | 504 | *buf = ('X' | locase); |
1da177e4 LT |
505 | ++buf; |
506 | } | |
507 | } | |
b39a7340 | 508 | /* zero or space padding */ |
fef20d9c FW |
509 | if (!(spec.flags & LEFT)) { |
510 | char c = (spec.flags & ZEROPAD) ? '0' : ' '; | |
511 | while (--spec.field_width >= 0) { | |
f796937a | 512 | if (buf < end) |
1da177e4 LT |
513 | *buf = c; |
514 | ++buf; | |
515 | } | |
516 | } | |
b39a7340 | 517 | /* hmm even more zero padding? */ |
fef20d9c | 518 | while (i <= --spec.precision) { |
f796937a | 519 | if (buf < end) |
1da177e4 LT |
520 | *buf = '0'; |
521 | ++buf; | |
522 | } | |
b39a7340 DV |
523 | /* actual digits of result */ |
524 | while (--i >= 0) { | |
f796937a | 525 | if (buf < end) |
1da177e4 LT |
526 | *buf = tmp[i]; |
527 | ++buf; | |
528 | } | |
b39a7340 | 529 | /* trailing space padding */ |
fef20d9c | 530 | while (--spec.field_width >= 0) { |
f796937a | 531 | if (buf < end) |
1da177e4 LT |
532 | *buf = ' '; |
533 | ++buf; | |
534 | } | |
7b9186f5 | 535 | |
1da177e4 LT |
536 | return buf; |
537 | } | |
538 | ||
0f4f81dc | 539 | static char *string(char *buf, char *end, const char *s, struct printf_spec spec) |
0f9bfa56 LT |
540 | { |
541 | int len, i; | |
542 | ||
543 | if ((unsigned long)s < PAGE_SIZE) | |
0f4f81dc | 544 | s = "(null)"; |
0f9bfa56 | 545 | |
fef20d9c | 546 | len = strnlen(s, spec.precision); |
0f9bfa56 | 547 | |
fef20d9c FW |
548 | if (!(spec.flags & LEFT)) { |
549 | while (len < spec.field_width--) { | |
0f9bfa56 LT |
550 | if (buf < end) |
551 | *buf = ' '; | |
552 | ++buf; | |
553 | } | |
554 | } | |
555 | for (i = 0; i < len; ++i) { | |
556 | if (buf < end) | |
557 | *buf = *s; | |
558 | ++buf; ++s; | |
559 | } | |
fef20d9c | 560 | while (len < spec.field_width--) { |
0f9bfa56 LT |
561 | if (buf < end) |
562 | *buf = ' '; | |
563 | ++buf; | |
564 | } | |
7b9186f5 | 565 | |
0f9bfa56 LT |
566 | return buf; |
567 | } | |
568 | ||
fef20d9c | 569 | static char *symbol_string(char *buf, char *end, void *ptr, |
0c8b946e | 570 | struct printf_spec spec, char ext) |
0fe1ef24 LT |
571 | { |
572 | unsigned long value = (unsigned long) ptr; | |
573 | #ifdef CONFIG_KALLSYMS | |
574 | char sym[KSYM_SYMBOL_LEN]; | |
91adcd2c | 575 | if (ext != 'f' && ext != 's') |
0c8b946e FW |
576 | sprint_symbol(sym, value); |
577 | else | |
578 | kallsyms_lookup(value, NULL, NULL, NULL, sym); | |
7b9186f5 | 579 | |
fef20d9c | 580 | return string(buf, end, sym, spec); |
0fe1ef24 | 581 | #else |
7b9186f5 | 582 | spec.field_width = 2 * sizeof(void *); |
fef20d9c FW |
583 | spec.flags |= SPECIAL | SMALL | ZEROPAD; |
584 | spec.base = 16; | |
7b9186f5 | 585 | |
fef20d9c | 586 | return number(buf, end, value, spec); |
0fe1ef24 LT |
587 | #endif |
588 | } | |
589 | ||
fef20d9c | 590 | static char *resource_string(char *buf, char *end, struct resource *res, |
fd95541e | 591 | struct printf_spec spec, const char *fmt) |
332d2e78 LT |
592 | { |
593 | #ifndef IO_RSRC_PRINTK_SIZE | |
28405372 | 594 | #define IO_RSRC_PRINTK_SIZE 6 |
332d2e78 LT |
595 | #endif |
596 | ||
597 | #ifndef MEM_RSRC_PRINTK_SIZE | |
28405372 | 598 | #define MEM_RSRC_PRINTK_SIZE 10 |
332d2e78 | 599 | #endif |
4da0b66c | 600 | static const struct printf_spec io_spec = { |
fef20d9c | 601 | .base = 16, |
4da0b66c | 602 | .field_width = IO_RSRC_PRINTK_SIZE, |
fef20d9c FW |
603 | .precision = -1, |
604 | .flags = SPECIAL | SMALL | ZEROPAD, | |
605 | }; | |
4da0b66c BH |
606 | static const struct printf_spec mem_spec = { |
607 | .base = 16, | |
608 | .field_width = MEM_RSRC_PRINTK_SIZE, | |
609 | .precision = -1, | |
610 | .flags = SPECIAL | SMALL | ZEROPAD, | |
611 | }; | |
0f4050c7 BH |
612 | static const struct printf_spec bus_spec = { |
613 | .base = 16, | |
614 | .field_width = 2, | |
615 | .precision = -1, | |
616 | .flags = SMALL | ZEROPAD, | |
617 | }; | |
4da0b66c | 618 | static const struct printf_spec dec_spec = { |
c91d3376 BH |
619 | .base = 10, |
620 | .precision = -1, | |
621 | .flags = 0, | |
622 | }; | |
4da0b66c | 623 | static const struct printf_spec str_spec = { |
fd95541e BH |
624 | .field_width = -1, |
625 | .precision = 10, | |
626 | .flags = LEFT, | |
627 | }; | |
4da0b66c | 628 | static const struct printf_spec flag_spec = { |
fd95541e BH |
629 | .base = 16, |
630 | .precision = -1, | |
631 | .flags = SPECIAL | SMALL, | |
632 | }; | |
c7dabef8 BH |
633 | |
634 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) | |
635 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ | |
636 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) | |
637 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) | |
9d7cca04 | 638 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") |
c7dabef8 BH |
639 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") |
640 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, | |
641 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; | |
642 | ||
332d2e78 | 643 | char *p = sym, *pend = sym + sizeof(sym); |
c7dabef8 | 644 | int decode = (fmt[0] == 'R') ? 1 : 0; |
4da0b66c | 645 | const struct printf_spec *specp; |
332d2e78 LT |
646 | |
647 | *p++ = '['; | |
4da0b66c | 648 | if (res->flags & IORESOURCE_IO) { |
c7dabef8 | 649 | p = string(p, pend, "io ", str_spec); |
4da0b66c BH |
650 | specp = &io_spec; |
651 | } else if (res->flags & IORESOURCE_MEM) { | |
c7dabef8 | 652 | p = string(p, pend, "mem ", str_spec); |
4da0b66c BH |
653 | specp = &mem_spec; |
654 | } else if (res->flags & IORESOURCE_IRQ) { | |
c7dabef8 | 655 | p = string(p, pend, "irq ", str_spec); |
4da0b66c BH |
656 | specp = &dec_spec; |
657 | } else if (res->flags & IORESOURCE_DMA) { | |
c7dabef8 | 658 | p = string(p, pend, "dma ", str_spec); |
4da0b66c | 659 | specp = &dec_spec; |
0f4050c7 BH |
660 | } else if (res->flags & IORESOURCE_BUS) { |
661 | p = string(p, pend, "bus ", str_spec); | |
662 | specp = &bus_spec; | |
4da0b66c | 663 | } else { |
c7dabef8 | 664 | p = string(p, pend, "??? ", str_spec); |
4da0b66c | 665 | specp = &mem_spec; |
c7dabef8 | 666 | decode = 0; |
fd95541e | 667 | } |
4da0b66c | 668 | p = number(p, pend, res->start, *specp); |
c91d3376 BH |
669 | if (res->start != res->end) { |
670 | *p++ = '-'; | |
4da0b66c | 671 | p = number(p, pend, res->end, *specp); |
c91d3376 | 672 | } |
c7dabef8 | 673 | if (decode) { |
fd95541e BH |
674 | if (res->flags & IORESOURCE_MEM_64) |
675 | p = string(p, pend, " 64bit", str_spec); | |
676 | if (res->flags & IORESOURCE_PREFETCH) | |
677 | p = string(p, pend, " pref", str_spec); | |
9d7cca04 BH |
678 | if (res->flags & IORESOURCE_WINDOW) |
679 | p = string(p, pend, " window", str_spec); | |
fd95541e BH |
680 | if (res->flags & IORESOURCE_DISABLED) |
681 | p = string(p, pend, " disabled", str_spec); | |
c7dabef8 BH |
682 | } else { |
683 | p = string(p, pend, " flags ", str_spec); | |
684 | p = number(p, pend, res->flags, flag_spec); | |
fd95541e | 685 | } |
332d2e78 | 686 | *p++ = ']'; |
c7dabef8 | 687 | *p = '\0'; |
332d2e78 | 688 | |
fef20d9c | 689 | return string(buf, end, sym, spec); |
332d2e78 LT |
690 | } |
691 | ||
fef20d9c | 692 | static char *mac_address_string(char *buf, char *end, u8 *addr, |
8a27f7c9 | 693 | struct printf_spec spec, const char *fmt) |
dd45c9cf | 694 | { |
8a27f7c9 | 695 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; |
dd45c9cf HH |
696 | char *p = mac_addr; |
697 | int i; | |
bc7259a2 JP |
698 | char separator; |
699 | ||
700 | if (fmt[1] == 'F') { /* FDDI canonical format */ | |
bc7259a2 JP |
701 | separator = '-'; |
702 | } else { | |
bc7259a2 JP |
703 | separator = ':'; |
704 | } | |
dd45c9cf HH |
705 | |
706 | for (i = 0; i < 6; i++) { | |
c8e00060 | 707 | p = pack_hex_byte(p, addr[i]); |
8a27f7c9 | 708 | if (fmt[0] == 'M' && i != 5) |
bc7259a2 | 709 | *p++ = separator; |
dd45c9cf HH |
710 | } |
711 | *p = '\0'; | |
712 | ||
fef20d9c | 713 | return string(buf, end, mac_addr, spec); |
dd45c9cf HH |
714 | } |
715 | ||
0159f24e | 716 | static char *ip4_string(char *p, const u8 *addr, const char *fmt) |
8a27f7c9 JP |
717 | { |
718 | int i; | |
0159f24e JP |
719 | bool leading_zeros = (fmt[0] == 'i'); |
720 | int index; | |
721 | int step; | |
722 | ||
723 | switch (fmt[2]) { | |
724 | case 'h': | |
725 | #ifdef __BIG_ENDIAN | |
726 | index = 0; | |
727 | step = 1; | |
728 | #else | |
729 | index = 3; | |
730 | step = -1; | |
731 | #endif | |
732 | break; | |
733 | case 'l': | |
734 | index = 3; | |
735 | step = -1; | |
736 | break; | |
737 | case 'n': | |
738 | case 'b': | |
739 | default: | |
740 | index = 0; | |
741 | step = 1; | |
742 | break; | |
743 | } | |
8a27f7c9 JP |
744 | for (i = 0; i < 4; i++) { |
745 | char temp[3]; /* hold each IP quad in reverse order */ | |
0159f24e | 746 | int digits = put_dec_trunc(temp, addr[index]) - temp; |
8a27f7c9 JP |
747 | if (leading_zeros) { |
748 | if (digits < 3) | |
749 | *p++ = '0'; | |
750 | if (digits < 2) | |
751 | *p++ = '0'; | |
752 | } | |
753 | /* reverse the digits in the quad */ | |
754 | while (digits--) | |
755 | *p++ = temp[digits]; | |
756 | if (i < 3) | |
757 | *p++ = '.'; | |
0159f24e | 758 | index += step; |
8a27f7c9 | 759 | } |
8a27f7c9 | 760 | *p = '\0'; |
7b9186f5 | 761 | |
8a27f7c9 JP |
762 | return p; |
763 | } | |
764 | ||
eb78cd26 | 765 | static char *ip6_compressed_string(char *p, const char *addr) |
689afa7d | 766 | { |
7b9186f5 | 767 | int i, j, range; |
8a27f7c9 JP |
768 | unsigned char zerolength[8]; |
769 | int longest = 1; | |
770 | int colonpos = -1; | |
771 | u16 word; | |
7b9186f5 | 772 | u8 hi, lo; |
8a27f7c9 | 773 | bool needcolon = false; |
eb78cd26 JP |
774 | bool useIPv4; |
775 | struct in6_addr in6; | |
776 | ||
777 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
778 | ||
779 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
8a27f7c9 JP |
780 | |
781 | memset(zerolength, 0, sizeof(zerolength)); | |
782 | ||
783 | if (useIPv4) | |
784 | range = 6; | |
785 | else | |
786 | range = 8; | |
787 | ||
788 | /* find position of longest 0 run */ | |
789 | for (i = 0; i < range; i++) { | |
790 | for (j = i; j < range; j++) { | |
eb78cd26 | 791 | if (in6.s6_addr16[j] != 0) |
8a27f7c9 JP |
792 | break; |
793 | zerolength[i]++; | |
794 | } | |
795 | } | |
796 | for (i = 0; i < range; i++) { | |
797 | if (zerolength[i] > longest) { | |
798 | longest = zerolength[i]; | |
799 | colonpos = i; | |
800 | } | |
801 | } | |
689afa7d | 802 | |
8a27f7c9 JP |
803 | /* emit address */ |
804 | for (i = 0; i < range; i++) { | |
805 | if (i == colonpos) { | |
806 | if (needcolon || i == 0) | |
807 | *p++ = ':'; | |
808 | *p++ = ':'; | |
809 | needcolon = false; | |
810 | i += longest - 1; | |
811 | continue; | |
812 | } | |
813 | if (needcolon) { | |
814 | *p++ = ':'; | |
815 | needcolon = false; | |
816 | } | |
817 | /* hex u16 without leading 0s */ | |
eb78cd26 | 818 | word = ntohs(in6.s6_addr16[i]); |
8a27f7c9 JP |
819 | hi = word >> 8; |
820 | lo = word & 0xff; | |
821 | if (hi) { | |
822 | if (hi > 0x0f) | |
823 | p = pack_hex_byte(p, hi); | |
824 | else | |
825 | *p++ = hex_asc_lo(hi); | |
b5ff992b | 826 | p = pack_hex_byte(p, lo); |
8a27f7c9 | 827 | } |
b5ff992b | 828 | else if (lo > 0x0f) |
8a27f7c9 JP |
829 | p = pack_hex_byte(p, lo); |
830 | else | |
831 | *p++ = hex_asc_lo(lo); | |
832 | needcolon = true; | |
833 | } | |
834 | ||
835 | if (useIPv4) { | |
836 | if (needcolon) | |
837 | *p++ = ':'; | |
0159f24e | 838 | p = ip4_string(p, &in6.s6_addr[12], "I4"); |
8a27f7c9 | 839 | } |
8a27f7c9 | 840 | *p = '\0'; |
7b9186f5 | 841 | |
8a27f7c9 JP |
842 | return p; |
843 | } | |
844 | ||
eb78cd26 | 845 | static char *ip6_string(char *p, const char *addr, const char *fmt) |
8a27f7c9 JP |
846 | { |
847 | int i; | |
7b9186f5 | 848 | |
689afa7d | 849 | for (i = 0; i < 8; i++) { |
eb78cd26 JP |
850 | p = pack_hex_byte(p, *addr++); |
851 | p = pack_hex_byte(p, *addr++); | |
8a27f7c9 | 852 | if (fmt[0] == 'I' && i != 7) |
689afa7d HH |
853 | *p++ = ':'; |
854 | } | |
855 | *p = '\0'; | |
7b9186f5 | 856 | |
8a27f7c9 JP |
857 | return p; |
858 | } | |
859 | ||
860 | static char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
861 | struct printf_spec spec, const char *fmt) | |
862 | { | |
863 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
864 | ||
865 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
eb78cd26 | 866 | ip6_compressed_string(ip6_addr, addr); |
8a27f7c9 | 867 | else |
eb78cd26 | 868 | ip6_string(ip6_addr, addr, fmt); |
689afa7d | 869 | |
fef20d9c | 870 | return string(buf, end, ip6_addr, spec); |
689afa7d HH |
871 | } |
872 | ||
8a27f7c9 JP |
873 | static char *ip4_addr_string(char *buf, char *end, const u8 *addr, |
874 | struct printf_spec spec, const char *fmt) | |
4aa99606 | 875 | { |
8a27f7c9 | 876 | char ip4_addr[sizeof("255.255.255.255")]; |
4aa99606 | 877 | |
0159f24e | 878 | ip4_string(ip4_addr, addr, fmt); |
4aa99606 | 879 | |
fef20d9c | 880 | return string(buf, end, ip4_addr, spec); |
4aa99606 HH |
881 | } |
882 | ||
9ac6e44e JP |
883 | static char *uuid_string(char *buf, char *end, const u8 *addr, |
884 | struct printf_spec spec, const char *fmt) | |
885 | { | |
886 | char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; | |
887 | char *p = uuid; | |
888 | int i; | |
889 | static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; | |
890 | static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; | |
891 | const u8 *index = be; | |
892 | bool uc = false; | |
893 | ||
894 | switch (*(++fmt)) { | |
895 | case 'L': | |
896 | uc = true; /* fall-through */ | |
897 | case 'l': | |
898 | index = le; | |
899 | break; | |
900 | case 'B': | |
901 | uc = true; | |
902 | break; | |
903 | } | |
904 | ||
905 | for (i = 0; i < 16; i++) { | |
906 | p = pack_hex_byte(p, addr[index[i]]); | |
907 | switch (i) { | |
908 | case 3: | |
909 | case 5: | |
910 | case 7: | |
911 | case 9: | |
912 | *p++ = '-'; | |
913 | break; | |
914 | } | |
915 | } | |
916 | ||
917 | *p = 0; | |
918 | ||
919 | if (uc) { | |
920 | p = uuid; | |
921 | do { | |
922 | *p = toupper(*p); | |
923 | } while (*(++p)); | |
924 | } | |
925 | ||
926 | return string(buf, end, uuid, spec); | |
927 | } | |
928 | ||
4d8a743c LT |
929 | /* |
930 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
931 | * by an extra set of alphanumeric characters that are extended format | |
932 | * specifiers. | |
933 | * | |
332d2e78 LT |
934 | * Right now we handle: |
935 | * | |
0c8b946e FW |
936 | * - 'F' For symbolic function descriptor pointers with offset |
937 | * - 'f' For simple symbolic function names without offset | |
0efb4d20 SR |
938 | * - 'S' For symbolic direct pointers with offset |
939 | * - 's' For symbolic direct pointers without offset | |
c7dabef8 BH |
940 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] |
941 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] | |
dd45c9cf HH |
942 | * - 'M' For a 6-byte MAC address, it prints the address in the |
943 | * usual colon-separated hex notation | |
8a27f7c9 | 944 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons |
bc7259a2 | 945 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address |
c8e00060 | 946 | * with a dash-separated hex notation |
8a27f7c9 JP |
947 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way |
948 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
949 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
950 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses | |
951 | * IPv6 omits the colons (01020304...0f) | |
952 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
0159f24e | 953 | * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order |
8a27f7c9 | 954 | * - 'I6c' for IPv6 addresses printed as specified by |
3f472402 | 955 | * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00 |
9ac6e44e JP |
956 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form |
957 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" | |
958 | * Options for %pU are: | |
959 | * b big endian lower case hex (default) | |
960 | * B big endian UPPER case hex | |
961 | * l little endian lower case hex | |
962 | * L little endian UPPER case hex | |
963 | * big endian output byte order is: | |
964 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] | |
965 | * little endian output byte order is: | |
966 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] | |
967 | * | |
332d2e78 LT |
968 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 |
969 | * function pointers are really function descriptors, which contain a | |
970 | * pointer to the real address. | |
4d8a743c | 971 | */ |
fef20d9c FW |
972 | static char *pointer(const char *fmt, char *buf, char *end, void *ptr, |
973 | struct printf_spec spec) | |
78a8bf69 | 974 | { |
d97106ab | 975 | if (!ptr) |
fef20d9c | 976 | return string(buf, end, "(null)", spec); |
d97106ab | 977 | |
0fe1ef24 LT |
978 | switch (*fmt) { |
979 | case 'F': | |
0c8b946e | 980 | case 'f': |
0fe1ef24 LT |
981 | ptr = dereference_function_descriptor(ptr); |
982 | /* Fallthrough */ | |
983 | case 'S': | |
9ac6e44e | 984 | case 's': |
0c8b946e | 985 | return symbol_string(buf, end, ptr, spec, *fmt); |
332d2e78 | 986 | case 'R': |
c7dabef8 | 987 | case 'r': |
fd95541e | 988 | return resource_string(buf, end, ptr, spec, fmt); |
8a27f7c9 JP |
989 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
990 | case 'm': /* Contiguous: 000102030405 */ | |
bc7259a2 | 991 | /* [mM]F (FDDI, bit reversed) */ |
8a27f7c9 JP |
992 | return mac_address_string(buf, end, ptr, spec, fmt); |
993 | case 'I': /* Formatted IP supported | |
994 | * 4: 1.2.3.4 | |
995 | * 6: 0001:0203:...:0708 | |
996 | * 6c: 1::708 or 1::1.2.3.4 | |
997 | */ | |
998 | case 'i': /* Contiguous: | |
999 | * 4: 001.002.003.004 | |
1000 | * 6: 000102...0f | |
1001 | */ | |
1002 | switch (fmt[1]) { | |
1003 | case '6': | |
1004 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
1005 | case '4': | |
1006 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
1007 | } | |
fef20d9c | 1008 | break; |
9ac6e44e JP |
1009 | case 'U': |
1010 | return uuid_string(buf, end, ptr, spec, fmt); | |
fef20d9c FW |
1011 | } |
1012 | spec.flags |= SMALL; | |
1013 | if (spec.field_width == -1) { | |
1014 | spec.field_width = 2*sizeof(void *); | |
1015 | spec.flags |= ZEROPAD; | |
1016 | } | |
1017 | spec.base = 16; | |
1018 | ||
1019 | return number(buf, end, (unsigned long) ptr, spec); | |
1020 | } | |
1021 | ||
1022 | /* | |
1023 | * Helper function to decode printf style format. | |
1024 | * Each call decode a token from the format and return the | |
1025 | * number of characters read (or likely the delta where it wants | |
1026 | * to go on the next call). | |
1027 | * The decoded token is returned through the parameters | |
1028 | * | |
1029 | * 'h', 'l', or 'L' for integer fields | |
1030 | * 'z' support added 23/7/1999 S.H. | |
1031 | * 'z' changed to 'Z' --davidm 1/25/99 | |
1032 | * 't' added for ptrdiff_t | |
1033 | * | |
1034 | * @fmt: the format string | |
1035 | * @type of the token returned | |
1036 | * @flags: various flags such as +, -, # tokens.. | |
1037 | * @field_width: overwritten width | |
1038 | * @base: base of the number (octal, hex, ...) | |
1039 | * @precision: precision of a number | |
1040 | * @qualifier: qualifier of a number (long, size_t, ...) | |
1041 | */ | |
1042 | static int format_decode(const char *fmt, struct printf_spec *spec) | |
1043 | { | |
1044 | const char *start = fmt; | |
fef20d9c FW |
1045 | |
1046 | /* we finished early by reading the field width */ | |
ed681a91 | 1047 | if (spec->type == FORMAT_TYPE_WIDTH) { |
fef20d9c FW |
1048 | if (spec->field_width < 0) { |
1049 | spec->field_width = -spec->field_width; | |
1050 | spec->flags |= LEFT; | |
1051 | } | |
1052 | spec->type = FORMAT_TYPE_NONE; | |
1053 | goto precision; | |
1054 | } | |
1055 | ||
1056 | /* we finished early by reading the precision */ | |
1057 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
1058 | if (spec->precision < 0) | |
1059 | spec->precision = 0; | |
1060 | ||
1061 | spec->type = FORMAT_TYPE_NONE; | |
1062 | goto qualifier; | |
1063 | } | |
1064 | ||
1065 | /* By default */ | |
1066 | spec->type = FORMAT_TYPE_NONE; | |
1067 | ||
1068 | for (; *fmt ; ++fmt) { | |
1069 | if (*fmt == '%') | |
1070 | break; | |
1071 | } | |
1072 | ||
1073 | /* Return the current non-format string */ | |
1074 | if (fmt != start || !*fmt) | |
1075 | return fmt - start; | |
1076 | ||
1077 | /* Process flags */ | |
1078 | spec->flags = 0; | |
1079 | ||
1080 | while (1) { /* this also skips first '%' */ | |
1081 | bool found = true; | |
1082 | ||
1083 | ++fmt; | |
1084 | ||
1085 | switch (*fmt) { | |
1086 | case '-': spec->flags |= LEFT; break; | |
1087 | case '+': spec->flags |= PLUS; break; | |
1088 | case ' ': spec->flags |= SPACE; break; | |
1089 | case '#': spec->flags |= SPECIAL; break; | |
1090 | case '0': spec->flags |= ZEROPAD; break; | |
1091 | default: found = false; | |
1092 | } | |
1093 | ||
1094 | if (!found) | |
1095 | break; | |
1096 | } | |
1097 | ||
1098 | /* get field width */ | |
1099 | spec->field_width = -1; | |
1100 | ||
1101 | if (isdigit(*fmt)) | |
1102 | spec->field_width = skip_atoi(&fmt); | |
1103 | else if (*fmt == '*') { | |
1104 | /* it's the next argument */ | |
ed681a91 | 1105 | spec->type = FORMAT_TYPE_WIDTH; |
fef20d9c FW |
1106 | return ++fmt - start; |
1107 | } | |
1108 | ||
1109 | precision: | |
1110 | /* get the precision */ | |
1111 | spec->precision = -1; | |
1112 | if (*fmt == '.') { | |
1113 | ++fmt; | |
1114 | if (isdigit(*fmt)) { | |
1115 | spec->precision = skip_atoi(&fmt); | |
1116 | if (spec->precision < 0) | |
1117 | spec->precision = 0; | |
1118 | } else if (*fmt == '*') { | |
1119 | /* it's the next argument */ | |
adf26f84 | 1120 | spec->type = FORMAT_TYPE_PRECISION; |
fef20d9c FW |
1121 | return ++fmt - start; |
1122 | } | |
1123 | } | |
1124 | ||
1125 | qualifier: | |
1126 | /* get the conversion qualifier */ | |
1127 | spec->qualifier = -1; | |
08562cb2 AGR |
1128 | if (*fmt == 'h' || TOLOWER(*fmt) == 'l' || |
1129 | TOLOWER(*fmt) == 'z' || *fmt == 't') { | |
a4e94ef0 Z |
1130 | spec->qualifier = *fmt++; |
1131 | if (unlikely(spec->qualifier == *fmt)) { | |
1132 | if (spec->qualifier == 'l') { | |
1133 | spec->qualifier = 'L'; | |
1134 | ++fmt; | |
1135 | } else if (spec->qualifier == 'h') { | |
1136 | spec->qualifier = 'H'; | |
1137 | ++fmt; | |
1138 | } | |
fef20d9c FW |
1139 | } |
1140 | } | |
1141 | ||
1142 | /* default base */ | |
1143 | spec->base = 10; | |
1144 | switch (*fmt) { | |
1145 | case 'c': | |
1146 | spec->type = FORMAT_TYPE_CHAR; | |
1147 | return ++fmt - start; | |
1148 | ||
1149 | case 's': | |
1150 | spec->type = FORMAT_TYPE_STR; | |
1151 | return ++fmt - start; | |
1152 | ||
1153 | case 'p': | |
1154 | spec->type = FORMAT_TYPE_PTR; | |
1155 | return fmt - start; | |
1156 | /* skip alnum */ | |
1157 | ||
1158 | case 'n': | |
1159 | spec->type = FORMAT_TYPE_NRCHARS; | |
1160 | return ++fmt - start; | |
1161 | ||
1162 | case '%': | |
1163 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
1164 | return ++fmt - start; | |
1165 | ||
1166 | /* integer number formats - set up the flags and "break" */ | |
1167 | case 'o': | |
1168 | spec->base = 8; | |
1169 | break; | |
1170 | ||
1171 | case 'x': | |
1172 | spec->flags |= SMALL; | |
1173 | ||
1174 | case 'X': | |
1175 | spec->base = 16; | |
1176 | break; | |
1177 | ||
1178 | case 'd': | |
1179 | case 'i': | |
39e874f8 | 1180 | spec->flags |= SIGN; |
fef20d9c | 1181 | case 'u': |
4aa99606 | 1182 | break; |
fef20d9c FW |
1183 | |
1184 | default: | |
1185 | spec->type = FORMAT_TYPE_INVALID; | |
1186 | return fmt - start; | |
0fe1ef24 | 1187 | } |
fef20d9c FW |
1188 | |
1189 | if (spec->qualifier == 'L') | |
1190 | spec->type = FORMAT_TYPE_LONG_LONG; | |
1191 | else if (spec->qualifier == 'l') { | |
39e874f8 | 1192 | if (spec->flags & SIGN) |
fef20d9c FW |
1193 | spec->type = FORMAT_TYPE_LONG; |
1194 | else | |
1195 | spec->type = FORMAT_TYPE_ULONG; | |
08562cb2 | 1196 | } else if (TOLOWER(spec->qualifier) == 'z') { |
fef20d9c FW |
1197 | spec->type = FORMAT_TYPE_SIZE_T; |
1198 | } else if (spec->qualifier == 't') { | |
1199 | spec->type = FORMAT_TYPE_PTRDIFF; | |
a4e94ef0 Z |
1200 | } else if (spec->qualifier == 'H') { |
1201 | if (spec->flags & SIGN) | |
1202 | spec->type = FORMAT_TYPE_BYTE; | |
1203 | else | |
1204 | spec->type = FORMAT_TYPE_UBYTE; | |
fef20d9c | 1205 | } else if (spec->qualifier == 'h') { |
39e874f8 | 1206 | if (spec->flags & SIGN) |
fef20d9c FW |
1207 | spec->type = FORMAT_TYPE_SHORT; |
1208 | else | |
1209 | spec->type = FORMAT_TYPE_USHORT; | |
1210 | } else { | |
39e874f8 | 1211 | if (spec->flags & SIGN) |
fef20d9c FW |
1212 | spec->type = FORMAT_TYPE_INT; |
1213 | else | |
1214 | spec->type = FORMAT_TYPE_UINT; | |
78a8bf69 | 1215 | } |
fef20d9c FW |
1216 | |
1217 | return ++fmt - start; | |
78a8bf69 LT |
1218 | } |
1219 | ||
1da177e4 LT |
1220 | /** |
1221 | * vsnprintf - Format a string and place it in a buffer | |
1222 | * @buf: The buffer to place the result into | |
1223 | * @size: The size of the buffer, including the trailing null space | |
1224 | * @fmt: The format string to use | |
1225 | * @args: Arguments for the format string | |
1226 | * | |
20036fdc | 1227 | * This function follows C99 vsnprintf, but has some extensions: |
91adcd2c SR |
1228 | * %pS output the name of a text symbol with offset |
1229 | * %ps output the name of a text symbol without offset | |
0c8b946e FW |
1230 | * %pF output the name of a function pointer with its offset |
1231 | * %pf output the name of a function pointer without its offset | |
8a79503a UKK |
1232 | * %pR output the address range in a struct resource with decoded flags |
1233 | * %pr output the address range in a struct resource with raw flags | |
1234 | * %pM output a 6-byte MAC address with colons | |
1235 | * %pm output a 6-byte MAC address without colons | |
1236 | * %pI4 print an IPv4 address without leading zeros | |
1237 | * %pi4 print an IPv4 address with leading zeros | |
1238 | * %pI6 print an IPv6 address with colons | |
1239 | * %pi6 print an IPv6 address without colons | |
1240 | * %pI6c print an IPv6 address as specified by | |
3f472402 | 1241 | * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00 |
8a79503a UKK |
1242 | * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper |
1243 | * case. | |
0efb4d20 | 1244 | * %n is ignored |
20036fdc | 1245 | * |
1da177e4 LT |
1246 | * The return value is the number of characters which would |
1247 | * be generated for the given input, excluding the trailing | |
1248 | * '\0', as per ISO C99. If you want to have the exact | |
1249 | * number of characters written into @buf as return value | |
72fd4a35 | 1250 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
1251 | * return is greater than or equal to @size, the resulting |
1252 | * string is truncated. | |
1253 | * | |
1254 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 1255 | * You probably want snprintf() instead. |
1da177e4 LT |
1256 | */ |
1257 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1258 | { | |
1da177e4 | 1259 | unsigned long long num; |
d4be151b | 1260 | char *str, *end; |
fef20d9c | 1261 | struct printf_spec spec = {0}; |
1da177e4 | 1262 | |
f796937a JF |
1263 | /* Reject out-of-range values early. Large positive sizes are |
1264 | used for unknown buffer sizes. */ | |
2f30b1f9 | 1265 | if (WARN_ON_ONCE((int) size < 0)) |
1da177e4 | 1266 | return 0; |
1da177e4 LT |
1267 | |
1268 | str = buf; | |
f796937a | 1269 | end = buf + size; |
1da177e4 | 1270 | |
f796937a JF |
1271 | /* Make sure end is always >= buf */ |
1272 | if (end < buf) { | |
1273 | end = ((void *)-1); | |
1274 | size = end - buf; | |
1da177e4 LT |
1275 | } |
1276 | ||
fef20d9c FW |
1277 | while (*fmt) { |
1278 | const char *old_fmt = fmt; | |
d4be151b | 1279 | int read = format_decode(fmt, &spec); |
1da177e4 | 1280 | |
fef20d9c | 1281 | fmt += read; |
1da177e4 | 1282 | |
fef20d9c FW |
1283 | switch (spec.type) { |
1284 | case FORMAT_TYPE_NONE: { | |
1285 | int copy = read; | |
1286 | if (str < end) { | |
1287 | if (copy > end - str) | |
1288 | copy = end - str; | |
1289 | memcpy(str, old_fmt, copy); | |
1da177e4 | 1290 | } |
fef20d9c FW |
1291 | str += read; |
1292 | break; | |
1da177e4 LT |
1293 | } |
1294 | ||
ed681a91 | 1295 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1296 | spec.field_width = va_arg(args, int); |
1297 | break; | |
1da177e4 | 1298 | |
fef20d9c FW |
1299 | case FORMAT_TYPE_PRECISION: |
1300 | spec.precision = va_arg(args, int); | |
1301 | break; | |
1da177e4 | 1302 | |
d4be151b AGR |
1303 | case FORMAT_TYPE_CHAR: { |
1304 | char c; | |
1305 | ||
fef20d9c FW |
1306 | if (!(spec.flags & LEFT)) { |
1307 | while (--spec.field_width > 0) { | |
f796937a | 1308 | if (str < end) |
1da177e4 LT |
1309 | *str = ' '; |
1310 | ++str; | |
1da177e4 | 1311 | |
fef20d9c FW |
1312 | } |
1313 | } | |
1314 | c = (unsigned char) va_arg(args, int); | |
1315 | if (str < end) | |
1316 | *str = c; | |
1317 | ++str; | |
1318 | while (--spec.field_width > 0) { | |
f796937a | 1319 | if (str < end) |
fef20d9c | 1320 | *str = ' '; |
1da177e4 | 1321 | ++str; |
fef20d9c FW |
1322 | } |
1323 | break; | |
d4be151b | 1324 | } |
1da177e4 | 1325 | |
fef20d9c FW |
1326 | case FORMAT_TYPE_STR: |
1327 | str = string(str, end, va_arg(args, char *), spec); | |
1328 | break; | |
1da177e4 | 1329 | |
fef20d9c FW |
1330 | case FORMAT_TYPE_PTR: |
1331 | str = pointer(fmt+1, str, end, va_arg(args, void *), | |
1332 | spec); | |
1333 | while (isalnum(*fmt)) | |
1334 | fmt++; | |
1335 | break; | |
1da177e4 | 1336 | |
fef20d9c FW |
1337 | case FORMAT_TYPE_PERCENT_CHAR: |
1338 | if (str < end) | |
1339 | *str = '%'; | |
1340 | ++str; | |
1341 | break; | |
1da177e4 | 1342 | |
fef20d9c FW |
1343 | case FORMAT_TYPE_INVALID: |
1344 | if (str < end) | |
1345 | *str = '%'; | |
1346 | ++str; | |
fef20d9c FW |
1347 | break; |
1348 | ||
1349 | case FORMAT_TYPE_NRCHARS: { | |
ef0658f3 | 1350 | u8 qualifier = spec.qualifier; |
fef20d9c FW |
1351 | |
1352 | if (qualifier == 'l') { | |
1353 | long *ip = va_arg(args, long *); | |
1354 | *ip = (str - buf); | |
08562cb2 | 1355 | } else if (TOLOWER(qualifier) == 'z') { |
fef20d9c FW |
1356 | size_t *ip = va_arg(args, size_t *); |
1357 | *ip = (str - buf); | |
1358 | } else { | |
1359 | int *ip = va_arg(args, int *); | |
1360 | *ip = (str - buf); | |
1361 | } | |
1362 | break; | |
1da177e4 | 1363 | } |
fef20d9c FW |
1364 | |
1365 | default: | |
1366 | switch (spec.type) { | |
1367 | case FORMAT_TYPE_LONG_LONG: | |
1368 | num = va_arg(args, long long); | |
1369 | break; | |
1370 | case FORMAT_TYPE_ULONG: | |
1371 | num = va_arg(args, unsigned long); | |
1372 | break; | |
1373 | case FORMAT_TYPE_LONG: | |
1374 | num = va_arg(args, long); | |
1375 | break; | |
1376 | case FORMAT_TYPE_SIZE_T: | |
1377 | num = va_arg(args, size_t); | |
1378 | break; | |
1379 | case FORMAT_TYPE_PTRDIFF: | |
1380 | num = va_arg(args, ptrdiff_t); | |
1381 | break; | |
a4e94ef0 Z |
1382 | case FORMAT_TYPE_UBYTE: |
1383 | num = (unsigned char) va_arg(args, int); | |
1384 | break; | |
1385 | case FORMAT_TYPE_BYTE: | |
1386 | num = (signed char) va_arg(args, int); | |
1387 | break; | |
fef20d9c FW |
1388 | case FORMAT_TYPE_USHORT: |
1389 | num = (unsigned short) va_arg(args, int); | |
1390 | break; | |
1391 | case FORMAT_TYPE_SHORT: | |
1392 | num = (short) va_arg(args, int); | |
1393 | break; | |
39e874f8 FW |
1394 | case FORMAT_TYPE_INT: |
1395 | num = (int) va_arg(args, int); | |
fef20d9c FW |
1396 | break; |
1397 | default: | |
1398 | num = va_arg(args, unsigned int); | |
1399 | } | |
1400 | ||
1401 | str = number(str, end, num, spec); | |
1da177e4 | 1402 | } |
1da177e4 | 1403 | } |
fef20d9c | 1404 | |
f796937a JF |
1405 | if (size > 0) { |
1406 | if (str < end) | |
1407 | *str = '\0'; | |
1408 | else | |
0a6047ee | 1409 | end[-1] = '\0'; |
f796937a | 1410 | } |
fef20d9c | 1411 | |
f796937a | 1412 | /* the trailing null byte doesn't count towards the total */ |
1da177e4 | 1413 | return str-buf; |
fef20d9c | 1414 | |
1da177e4 | 1415 | } |
1da177e4 LT |
1416 | EXPORT_SYMBOL(vsnprintf); |
1417 | ||
1418 | /** | |
1419 | * vscnprintf - Format a string and place it in a buffer | |
1420 | * @buf: The buffer to place the result into | |
1421 | * @size: The size of the buffer, including the trailing null space | |
1422 | * @fmt: The format string to use | |
1423 | * @args: Arguments for the format string | |
1424 | * | |
1425 | * The return value is the number of characters which have been written into | |
1426 | * the @buf not including the trailing '\0'. If @size is <= 0 the function | |
1427 | * returns 0. | |
1428 | * | |
1429 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 1430 | * You probably want scnprintf() instead. |
20036fdc AK |
1431 | * |
1432 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1433 | */ |
1434 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1435 | { | |
1436 | int i; | |
1437 | ||
7b9186f5 AGR |
1438 | i = vsnprintf(buf, size, fmt, args); |
1439 | ||
1da177e4 LT |
1440 | return (i >= size) ? (size - 1) : i; |
1441 | } | |
1da177e4 LT |
1442 | EXPORT_SYMBOL(vscnprintf); |
1443 | ||
1444 | /** | |
1445 | * snprintf - Format a string and place it in a buffer | |
1446 | * @buf: The buffer to place the result into | |
1447 | * @size: The size of the buffer, including the trailing null space | |
1448 | * @fmt: The format string to use | |
1449 | * @...: Arguments for the format string | |
1450 | * | |
1451 | * The return value is the number of characters which would be | |
1452 | * generated for the given input, excluding the trailing null, | |
1453 | * as per ISO C99. If the return is greater than or equal to | |
1454 | * @size, the resulting string is truncated. | |
20036fdc AK |
1455 | * |
1456 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 1457 | */ |
7b9186f5 | 1458 | int snprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
1459 | { |
1460 | va_list args; | |
1461 | int i; | |
1462 | ||
1463 | va_start(args, fmt); | |
7b9186f5 | 1464 | i = vsnprintf(buf, size, fmt, args); |
1da177e4 | 1465 | va_end(args); |
7b9186f5 | 1466 | |
1da177e4 LT |
1467 | return i; |
1468 | } | |
1da177e4 LT |
1469 | EXPORT_SYMBOL(snprintf); |
1470 | ||
1471 | /** | |
1472 | * scnprintf - Format a string and place it in a buffer | |
1473 | * @buf: The buffer to place the result into | |
1474 | * @size: The size of the buffer, including the trailing null space | |
1475 | * @fmt: The format string to use | |
1476 | * @...: Arguments for the format string | |
1477 | * | |
1478 | * The return value is the number of characters written into @buf not including | |
ea6f3281 | 1479 | * the trailing '\0'. If @size is <= 0 the function returns 0. |
1da177e4 LT |
1480 | */ |
1481 | ||
7b9186f5 | 1482 | int scnprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
1483 | { |
1484 | va_list args; | |
1485 | int i; | |
1486 | ||
1487 | va_start(args, fmt); | |
1488 | i = vsnprintf(buf, size, fmt, args); | |
1489 | va_end(args); | |
7b9186f5 | 1490 | |
1da177e4 LT |
1491 | return (i >= size) ? (size - 1) : i; |
1492 | } | |
1493 | EXPORT_SYMBOL(scnprintf); | |
1494 | ||
1495 | /** | |
1496 | * vsprintf - Format a string and place it in a buffer | |
1497 | * @buf: The buffer to place the result into | |
1498 | * @fmt: The format string to use | |
1499 | * @args: Arguments for the format string | |
1500 | * | |
1501 | * The function returns the number of characters written | |
72fd4a35 | 1502 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
1503 | * buffer overflows. |
1504 | * | |
1505 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 1506 | * You probably want sprintf() instead. |
20036fdc AK |
1507 | * |
1508 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1509 | */ |
1510 | int vsprintf(char *buf, const char *fmt, va_list args) | |
1511 | { | |
1512 | return vsnprintf(buf, INT_MAX, fmt, args); | |
1513 | } | |
1da177e4 LT |
1514 | EXPORT_SYMBOL(vsprintf); |
1515 | ||
1516 | /** | |
1517 | * sprintf - Format a string and place it in a buffer | |
1518 | * @buf: The buffer to place the result into | |
1519 | * @fmt: The format string to use | |
1520 | * @...: Arguments for the format string | |
1521 | * | |
1522 | * The function returns the number of characters written | |
72fd4a35 | 1523 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 | 1524 | * buffer overflows. |
20036fdc AK |
1525 | * |
1526 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 1527 | */ |
7b9186f5 | 1528 | int sprintf(char *buf, const char *fmt, ...) |
1da177e4 LT |
1529 | { |
1530 | va_list args; | |
1531 | int i; | |
1532 | ||
1533 | va_start(args, fmt); | |
7b9186f5 | 1534 | i = vsnprintf(buf, INT_MAX, fmt, args); |
1da177e4 | 1535 | va_end(args); |
7b9186f5 | 1536 | |
1da177e4 LT |
1537 | return i; |
1538 | } | |
1da177e4 LT |
1539 | EXPORT_SYMBOL(sprintf); |
1540 | ||
4370aa4a LJ |
1541 | #ifdef CONFIG_BINARY_PRINTF |
1542 | /* | |
1543 | * bprintf service: | |
1544 | * vbin_printf() - VA arguments to binary data | |
1545 | * bstr_printf() - Binary data to text string | |
1546 | */ | |
1547 | ||
1548 | /** | |
1549 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
1550 | * @bin_buf: The buffer to place args' binary value | |
1551 | * @size: The size of the buffer(by words(32bits), not characters) | |
1552 | * @fmt: The format string to use | |
1553 | * @args: Arguments for the format string | |
1554 | * | |
1555 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
1556 | * is skiped. | |
1557 | * | |
1558 | * The return value is the number of words(32bits) which would be generated for | |
1559 | * the given input. | |
1560 | * | |
1561 | * NOTE: | |
1562 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
1563 | * valid for bstr_printf(). | |
1564 | */ | |
1565 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
1566 | { | |
fef20d9c | 1567 | struct printf_spec spec = {0}; |
4370aa4a | 1568 | char *str, *end; |
4370aa4a LJ |
1569 | |
1570 | str = (char *)bin_buf; | |
1571 | end = (char *)(bin_buf + size); | |
1572 | ||
1573 | #define save_arg(type) \ | |
1574 | do { \ | |
1575 | if (sizeof(type) == 8) { \ | |
1576 | unsigned long long value; \ | |
1577 | str = PTR_ALIGN(str, sizeof(u32)); \ | |
1578 | value = va_arg(args, unsigned long long); \ | |
1579 | if (str + sizeof(type) <= end) { \ | |
1580 | *(u32 *)str = *(u32 *)&value; \ | |
1581 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ | |
1582 | } \ | |
1583 | } else { \ | |
1584 | unsigned long value; \ | |
1585 | str = PTR_ALIGN(str, sizeof(type)); \ | |
1586 | value = va_arg(args, int); \ | |
1587 | if (str + sizeof(type) <= end) \ | |
1588 | *(typeof(type) *)str = (type)value; \ | |
1589 | } \ | |
1590 | str += sizeof(type); \ | |
1591 | } while (0) | |
1592 | ||
fef20d9c | 1593 | while (*fmt) { |
d4be151b | 1594 | int read = format_decode(fmt, &spec); |
4370aa4a | 1595 | |
fef20d9c | 1596 | fmt += read; |
4370aa4a | 1597 | |
fef20d9c FW |
1598 | switch (spec.type) { |
1599 | case FORMAT_TYPE_NONE: | |
d4be151b AGR |
1600 | case FORMAT_TYPE_INVALID: |
1601 | case FORMAT_TYPE_PERCENT_CHAR: | |
fef20d9c FW |
1602 | break; |
1603 | ||
ed681a91 | 1604 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1605 | case FORMAT_TYPE_PRECISION: |
1606 | save_arg(int); | |
1607 | break; | |
1608 | ||
1609 | case FORMAT_TYPE_CHAR: | |
4370aa4a | 1610 | save_arg(char); |
fef20d9c FW |
1611 | break; |
1612 | ||
1613 | case FORMAT_TYPE_STR: { | |
4370aa4a LJ |
1614 | const char *save_str = va_arg(args, char *); |
1615 | size_t len; | |
6c356634 | 1616 | |
4370aa4a LJ |
1617 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE |
1618 | || (unsigned long)save_str < PAGE_SIZE) | |
0f4f81dc | 1619 | save_str = "(null)"; |
6c356634 AGR |
1620 | len = strlen(save_str) + 1; |
1621 | if (str + len < end) | |
1622 | memcpy(str, save_str, len); | |
1623 | str += len; | |
fef20d9c | 1624 | break; |
4370aa4a | 1625 | } |
fef20d9c FW |
1626 | |
1627 | case FORMAT_TYPE_PTR: | |
4370aa4a LJ |
1628 | save_arg(void *); |
1629 | /* skip all alphanumeric pointer suffixes */ | |
fef20d9c | 1630 | while (isalnum(*fmt)) |
4370aa4a | 1631 | fmt++; |
fef20d9c FW |
1632 | break; |
1633 | ||
fef20d9c | 1634 | case FORMAT_TYPE_NRCHARS: { |
4370aa4a | 1635 | /* skip %n 's argument */ |
ef0658f3 | 1636 | u8 qualifier = spec.qualifier; |
4370aa4a LJ |
1637 | void *skip_arg; |
1638 | if (qualifier == 'l') | |
1639 | skip_arg = va_arg(args, long *); | |
08562cb2 | 1640 | else if (TOLOWER(qualifier) == 'z') |
4370aa4a LJ |
1641 | skip_arg = va_arg(args, size_t *); |
1642 | else | |
1643 | skip_arg = va_arg(args, int *); | |
fef20d9c | 1644 | break; |
4370aa4a | 1645 | } |
fef20d9c FW |
1646 | |
1647 | default: | |
1648 | switch (spec.type) { | |
1649 | ||
1650 | case FORMAT_TYPE_LONG_LONG: | |
4370aa4a | 1651 | save_arg(long long); |
fef20d9c FW |
1652 | break; |
1653 | case FORMAT_TYPE_ULONG: | |
1654 | case FORMAT_TYPE_LONG: | |
4370aa4a | 1655 | save_arg(unsigned long); |
fef20d9c FW |
1656 | break; |
1657 | case FORMAT_TYPE_SIZE_T: | |
4370aa4a | 1658 | save_arg(size_t); |
fef20d9c FW |
1659 | break; |
1660 | case FORMAT_TYPE_PTRDIFF: | |
4370aa4a | 1661 | save_arg(ptrdiff_t); |
fef20d9c | 1662 | break; |
a4e94ef0 Z |
1663 | case FORMAT_TYPE_UBYTE: |
1664 | case FORMAT_TYPE_BYTE: | |
1665 | save_arg(char); | |
1666 | break; | |
fef20d9c FW |
1667 | case FORMAT_TYPE_USHORT: |
1668 | case FORMAT_TYPE_SHORT: | |
4370aa4a | 1669 | save_arg(short); |
fef20d9c FW |
1670 | break; |
1671 | default: | |
4370aa4a | 1672 | save_arg(int); |
fef20d9c | 1673 | } |
4370aa4a LJ |
1674 | } |
1675 | } | |
fef20d9c | 1676 | |
7b9186f5 | 1677 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
fef20d9c | 1678 | #undef save_arg |
4370aa4a LJ |
1679 | } |
1680 | EXPORT_SYMBOL_GPL(vbin_printf); | |
1681 | ||
1682 | /** | |
1683 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
1684 | * @buf: The buffer to place the result into | |
1685 | * @size: The size of the buffer, including the trailing null space | |
1686 | * @fmt: The format string to use | |
1687 | * @bin_buf: Binary arguments for the format string | |
1688 | * | |
1689 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
1690 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
1691 | * a binary buffer that generated by vbin_printf. | |
1692 | * | |
1693 | * The format follows C99 vsnprintf, but has some extensions: | |
0efb4d20 | 1694 | * see vsnprintf comment for details. |
4370aa4a LJ |
1695 | * |
1696 | * The return value is the number of characters which would | |
1697 | * be generated for the given input, excluding the trailing | |
1698 | * '\0', as per ISO C99. If you want to have the exact | |
1699 | * number of characters written into @buf as return value | |
1700 | * (not including the trailing '\0'), use vscnprintf(). If the | |
1701 | * return is greater than or equal to @size, the resulting | |
1702 | * string is truncated. | |
1703 | */ | |
1704 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
1705 | { | |
fef20d9c | 1706 | struct printf_spec spec = {0}; |
d4be151b AGR |
1707 | char *str, *end; |
1708 | const char *args = (const char *)bin_buf; | |
4370aa4a | 1709 | |
2f30b1f9 | 1710 | if (WARN_ON_ONCE((int) size < 0)) |
4370aa4a | 1711 | return 0; |
4370aa4a LJ |
1712 | |
1713 | str = buf; | |
1714 | end = buf + size; | |
1715 | ||
1716 | #define get_arg(type) \ | |
1717 | ({ \ | |
1718 | typeof(type) value; \ | |
1719 | if (sizeof(type) == 8) { \ | |
1720 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
1721 | *(u32 *)&value = *(u32 *)args; \ | |
1722 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
1723 | } else { \ | |
1724 | args = PTR_ALIGN(args, sizeof(type)); \ | |
1725 | value = *(typeof(type) *)args; \ | |
1726 | } \ | |
1727 | args += sizeof(type); \ | |
1728 | value; \ | |
1729 | }) | |
1730 | ||
1731 | /* Make sure end is always >= buf */ | |
1732 | if (end < buf) { | |
1733 | end = ((void *)-1); | |
1734 | size = end - buf; | |
1735 | } | |
1736 | ||
fef20d9c | 1737 | while (*fmt) { |
fef20d9c | 1738 | const char *old_fmt = fmt; |
d4be151b | 1739 | int read = format_decode(fmt, &spec); |
4370aa4a | 1740 | |
fef20d9c | 1741 | fmt += read; |
4370aa4a | 1742 | |
fef20d9c FW |
1743 | switch (spec.type) { |
1744 | case FORMAT_TYPE_NONE: { | |
1745 | int copy = read; | |
1746 | if (str < end) { | |
1747 | if (copy > end - str) | |
1748 | copy = end - str; | |
1749 | memcpy(str, old_fmt, copy); | |
4370aa4a | 1750 | } |
fef20d9c FW |
1751 | str += read; |
1752 | break; | |
4370aa4a LJ |
1753 | } |
1754 | ||
ed681a91 | 1755 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1756 | spec.field_width = get_arg(int); |
1757 | break; | |
4370aa4a | 1758 | |
fef20d9c FW |
1759 | case FORMAT_TYPE_PRECISION: |
1760 | spec.precision = get_arg(int); | |
1761 | break; | |
4370aa4a | 1762 | |
d4be151b AGR |
1763 | case FORMAT_TYPE_CHAR: { |
1764 | char c; | |
1765 | ||
fef20d9c FW |
1766 | if (!(spec.flags & LEFT)) { |
1767 | while (--spec.field_width > 0) { | |
4370aa4a LJ |
1768 | if (str < end) |
1769 | *str = ' '; | |
1770 | ++str; | |
1771 | } | |
1772 | } | |
1773 | c = (unsigned char) get_arg(char); | |
1774 | if (str < end) | |
1775 | *str = c; | |
1776 | ++str; | |
fef20d9c | 1777 | while (--spec.field_width > 0) { |
4370aa4a LJ |
1778 | if (str < end) |
1779 | *str = ' '; | |
1780 | ++str; | |
1781 | } | |
fef20d9c | 1782 | break; |
d4be151b | 1783 | } |
4370aa4a | 1784 | |
fef20d9c | 1785 | case FORMAT_TYPE_STR: { |
4370aa4a | 1786 | const char *str_arg = args; |
d4be151b | 1787 | args += strlen(str_arg) + 1; |
fef20d9c FW |
1788 | str = string(str, end, (char *)str_arg, spec); |
1789 | break; | |
4370aa4a LJ |
1790 | } |
1791 | ||
fef20d9c FW |
1792 | case FORMAT_TYPE_PTR: |
1793 | str = pointer(fmt+1, str, end, get_arg(void *), spec); | |
1794 | while (isalnum(*fmt)) | |
4370aa4a | 1795 | fmt++; |
fef20d9c | 1796 | break; |
4370aa4a | 1797 | |
fef20d9c | 1798 | case FORMAT_TYPE_PERCENT_CHAR: |
fef20d9c | 1799 | case FORMAT_TYPE_INVALID: |
4370aa4a LJ |
1800 | if (str < end) |
1801 | *str = '%'; | |
1802 | ++str; | |
fef20d9c FW |
1803 | break; |
1804 | ||
1805 | case FORMAT_TYPE_NRCHARS: | |
1806 | /* skip */ | |
1807 | break; | |
1808 | ||
d4be151b AGR |
1809 | default: { |
1810 | unsigned long long num; | |
1811 | ||
fef20d9c FW |
1812 | switch (spec.type) { |
1813 | ||
1814 | case FORMAT_TYPE_LONG_LONG: | |
1815 | num = get_arg(long long); | |
1816 | break; | |
1817 | case FORMAT_TYPE_ULONG: | |
fef20d9c FW |
1818 | case FORMAT_TYPE_LONG: |
1819 | num = get_arg(unsigned long); | |
1820 | break; | |
1821 | case FORMAT_TYPE_SIZE_T: | |
1822 | num = get_arg(size_t); | |
1823 | break; | |
1824 | case FORMAT_TYPE_PTRDIFF: | |
1825 | num = get_arg(ptrdiff_t); | |
1826 | break; | |
a4e94ef0 Z |
1827 | case FORMAT_TYPE_UBYTE: |
1828 | num = get_arg(unsigned char); | |
1829 | break; | |
1830 | case FORMAT_TYPE_BYTE: | |
1831 | num = get_arg(signed char); | |
1832 | break; | |
fef20d9c FW |
1833 | case FORMAT_TYPE_USHORT: |
1834 | num = get_arg(unsigned short); | |
1835 | break; | |
1836 | case FORMAT_TYPE_SHORT: | |
1837 | num = get_arg(short); | |
1838 | break; | |
1839 | case FORMAT_TYPE_UINT: | |
1840 | num = get_arg(unsigned int); | |
1841 | break; | |
1842 | default: | |
1843 | num = get_arg(int); | |
1844 | } | |
1845 | ||
1846 | str = number(str, end, num, spec); | |
d4be151b AGR |
1847 | } /* default: */ |
1848 | } /* switch(spec.type) */ | |
1849 | } /* while(*fmt) */ | |
fef20d9c | 1850 | |
4370aa4a LJ |
1851 | if (size > 0) { |
1852 | if (str < end) | |
1853 | *str = '\0'; | |
1854 | else | |
1855 | end[-1] = '\0'; | |
1856 | } | |
fef20d9c | 1857 | |
4370aa4a LJ |
1858 | #undef get_arg |
1859 | ||
1860 | /* the trailing null byte doesn't count towards the total */ | |
1861 | return str - buf; | |
1862 | } | |
1863 | EXPORT_SYMBOL_GPL(bstr_printf); | |
1864 | ||
1865 | /** | |
1866 | * bprintf - Parse a format string and place args' binary value in a buffer | |
1867 | * @bin_buf: The buffer to place args' binary value | |
1868 | * @size: The size of the buffer(by words(32bits), not characters) | |
1869 | * @fmt: The format string to use | |
1870 | * @...: Arguments for the format string | |
1871 | * | |
1872 | * The function returns the number of words(u32) written | |
1873 | * into @bin_buf. | |
1874 | */ | |
1875 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
1876 | { | |
1877 | va_list args; | |
1878 | int ret; | |
1879 | ||
1880 | va_start(args, fmt); | |
1881 | ret = vbin_printf(bin_buf, size, fmt, args); | |
1882 | va_end(args); | |
7b9186f5 | 1883 | |
4370aa4a LJ |
1884 | return ret; |
1885 | } | |
1886 | EXPORT_SYMBOL_GPL(bprintf); | |
1887 | ||
1888 | #endif /* CONFIG_BINARY_PRINTF */ | |
1889 | ||
1da177e4 LT |
1890 | /** |
1891 | * vsscanf - Unformat a buffer into a list of arguments | |
1892 | * @buf: input buffer | |
1893 | * @fmt: format of buffer | |
1894 | * @args: arguments | |
1895 | */ | |
7b9186f5 | 1896 | int vsscanf(const char *buf, const char *fmt, va_list args) |
1da177e4 LT |
1897 | { |
1898 | const char *str = buf; | |
1899 | char *next; | |
1900 | char digit; | |
1901 | int num = 0; | |
ef0658f3 JP |
1902 | u8 qualifier; |
1903 | u8 base; | |
1904 | s16 field_width; | |
d4be151b | 1905 | bool is_sign; |
1da177e4 | 1906 | |
7b9186f5 | 1907 | while (*fmt && *str) { |
1da177e4 LT |
1908 | /* skip any white space in format */ |
1909 | /* white space in format matchs any amount of | |
1910 | * white space, including none, in the input. | |
1911 | */ | |
1912 | if (isspace(*fmt)) { | |
e7d2860b AGR |
1913 | fmt = skip_spaces(++fmt); |
1914 | str = skip_spaces(str); | |
1da177e4 LT |
1915 | } |
1916 | ||
1917 | /* anything that is not a conversion must match exactly */ | |
1918 | if (*fmt != '%' && *fmt) { | |
1919 | if (*fmt++ != *str++) | |
1920 | break; | |
1921 | continue; | |
1922 | } | |
1923 | ||
1924 | if (!*fmt) | |
1925 | break; | |
1926 | ++fmt; | |
7b9186f5 | 1927 | |
1da177e4 LT |
1928 | /* skip this conversion. |
1929 | * advance both strings to next white space | |
1930 | */ | |
1931 | if (*fmt == '*') { | |
8fccae2c | 1932 | while (!isspace(*fmt) && *fmt != '%' && *fmt) |
1da177e4 LT |
1933 | fmt++; |
1934 | while (!isspace(*str) && *str) | |
1935 | str++; | |
1936 | continue; | |
1937 | } | |
1938 | ||
1939 | /* get field width */ | |
1940 | field_width = -1; | |
1941 | if (isdigit(*fmt)) | |
1942 | field_width = skip_atoi(&fmt); | |
1943 | ||
1944 | /* get conversion qualifier */ | |
1945 | qualifier = -1; | |
08562cb2 AGR |
1946 | if (*fmt == 'h' || TOLOWER(*fmt) == 'l' || |
1947 | TOLOWER(*fmt) == 'z') { | |
1da177e4 LT |
1948 | qualifier = *fmt++; |
1949 | if (unlikely(qualifier == *fmt)) { | |
1950 | if (qualifier == 'h') { | |
1951 | qualifier = 'H'; | |
1952 | fmt++; | |
1953 | } else if (qualifier == 'l') { | |
1954 | qualifier = 'L'; | |
1955 | fmt++; | |
1956 | } | |
1957 | } | |
1958 | } | |
1da177e4 LT |
1959 | |
1960 | if (!*fmt || !*str) | |
1961 | break; | |
1962 | ||
d4be151b AGR |
1963 | base = 10; |
1964 | is_sign = 0; | |
1965 | ||
7b9186f5 | 1966 | switch (*fmt++) { |
1da177e4 LT |
1967 | case 'c': |
1968 | { | |
7b9186f5 | 1969 | char *s = (char *)va_arg(args, char*); |
1da177e4 LT |
1970 | if (field_width == -1) |
1971 | field_width = 1; | |
1972 | do { | |
1973 | *s++ = *str++; | |
1974 | } while (--field_width > 0 && *str); | |
1975 | num++; | |
1976 | } | |
1977 | continue; | |
1978 | case 's': | |
1979 | { | |
7b9186f5 AGR |
1980 | char *s = (char *)va_arg(args, char *); |
1981 | if (field_width == -1) | |
ef0658f3 | 1982 | field_width = SHORT_MAX; |
1da177e4 | 1983 | /* first, skip leading white space in buffer */ |
e7d2860b | 1984 | str = skip_spaces(str); |
1da177e4 LT |
1985 | |
1986 | /* now copy until next white space */ | |
7b9186f5 | 1987 | while (*str && !isspace(*str) && field_width--) |
1da177e4 | 1988 | *s++ = *str++; |
1da177e4 LT |
1989 | *s = '\0'; |
1990 | num++; | |
1991 | } | |
1992 | continue; | |
1993 | case 'n': | |
1994 | /* return number of characters read so far */ | |
1995 | { | |
7b9186f5 | 1996 | int *i = (int *)va_arg(args, int*); |
1da177e4 LT |
1997 | *i = str - buf; |
1998 | } | |
1999 | continue; | |
2000 | case 'o': | |
2001 | base = 8; | |
2002 | break; | |
2003 | case 'x': | |
2004 | case 'X': | |
2005 | base = 16; | |
2006 | break; | |
2007 | case 'i': | |
7b9186f5 | 2008 | base = 0; |
1da177e4 LT |
2009 | case 'd': |
2010 | is_sign = 1; | |
2011 | case 'u': | |
2012 | break; | |
2013 | case '%': | |
2014 | /* looking for '%' in str */ | |
7b9186f5 | 2015 | if (*str++ != '%') |
1da177e4 LT |
2016 | return num; |
2017 | continue; | |
2018 | default: | |
2019 | /* invalid format; stop here */ | |
2020 | return num; | |
2021 | } | |
2022 | ||
2023 | /* have some sort of integer conversion. | |
2024 | * first, skip white space in buffer. | |
2025 | */ | |
e7d2860b | 2026 | str = skip_spaces(str); |
1da177e4 LT |
2027 | |
2028 | digit = *str; | |
2029 | if (is_sign && digit == '-') | |
2030 | digit = *(str + 1); | |
2031 | ||
2032 | if (!digit | |
7b9186f5 AGR |
2033 | || (base == 16 && !isxdigit(digit)) |
2034 | || (base == 10 && !isdigit(digit)) | |
2035 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
2036 | || (base == 0 && !isdigit(digit))) | |
2037 | break; | |
1da177e4 | 2038 | |
7b9186f5 | 2039 | switch (qualifier) { |
1da177e4 LT |
2040 | case 'H': /* that's 'hh' in format */ |
2041 | if (is_sign) { | |
7b9186f5 AGR |
2042 | signed char *s = (signed char *)va_arg(args, signed char *); |
2043 | *s = (signed char)simple_strtol(str, &next, base); | |
1da177e4 | 2044 | } else { |
7b9186f5 AGR |
2045 | unsigned char *s = (unsigned char *)va_arg(args, unsigned char *); |
2046 | *s = (unsigned char)simple_strtoul(str, &next, base); | |
1da177e4 LT |
2047 | } |
2048 | break; | |
2049 | case 'h': | |
2050 | if (is_sign) { | |
7b9186f5 AGR |
2051 | short *s = (short *)va_arg(args, short *); |
2052 | *s = (short)simple_strtol(str, &next, base); | |
1da177e4 | 2053 | } else { |
7b9186f5 AGR |
2054 | unsigned short *s = (unsigned short *)va_arg(args, unsigned short *); |
2055 | *s = (unsigned short)simple_strtoul(str, &next, base); | |
1da177e4 LT |
2056 | } |
2057 | break; | |
2058 | case 'l': | |
2059 | if (is_sign) { | |
7b9186f5 AGR |
2060 | long *l = (long *)va_arg(args, long *); |
2061 | *l = simple_strtol(str, &next, base); | |
1da177e4 | 2062 | } else { |
7b9186f5 AGR |
2063 | unsigned long *l = (unsigned long *)va_arg(args, unsigned long *); |
2064 | *l = simple_strtoul(str, &next, base); | |
1da177e4 LT |
2065 | } |
2066 | break; | |
2067 | case 'L': | |
2068 | if (is_sign) { | |
7b9186f5 AGR |
2069 | long long *l = (long long *)va_arg(args, long long *); |
2070 | *l = simple_strtoll(str, &next, base); | |
1da177e4 | 2071 | } else { |
7b9186f5 AGR |
2072 | unsigned long long *l = (unsigned long long *)va_arg(args, unsigned long long *); |
2073 | *l = simple_strtoull(str, &next, base); | |
1da177e4 LT |
2074 | } |
2075 | break; | |
2076 | case 'Z': | |
2077 | case 'z': | |
2078 | { | |
7b9186f5 AGR |
2079 | size_t *s = (size_t *)va_arg(args, size_t *); |
2080 | *s = (size_t)simple_strtoul(str, &next, base); | |
1da177e4 LT |
2081 | } |
2082 | break; | |
2083 | default: | |
2084 | if (is_sign) { | |
7b9186f5 AGR |
2085 | int *i = (int *)va_arg(args, int *); |
2086 | *i = (int)simple_strtol(str, &next, base); | |
1da177e4 | 2087 | } else { |
7b9186f5 AGR |
2088 | unsigned int *i = (unsigned int *)va_arg(args, unsigned int*); |
2089 | *i = (unsigned int)simple_strtoul(str, &next, base); | |
1da177e4 LT |
2090 | } |
2091 | break; | |
2092 | } | |
2093 | num++; | |
2094 | ||
2095 | if (!next) | |
2096 | break; | |
2097 | str = next; | |
2098 | } | |
c6b40d16 JB |
2099 | |
2100 | /* | |
2101 | * Now we've come all the way through so either the input string or the | |
2102 | * format ended. In the former case, there can be a %n at the current | |
2103 | * position in the format that needs to be filled. | |
2104 | */ | |
2105 | if (*fmt == '%' && *(fmt + 1) == 'n') { | |
2106 | int *p = (int *)va_arg(args, int *); | |
2107 | *p = str - buf; | |
2108 | } | |
2109 | ||
1da177e4 LT |
2110 | return num; |
2111 | } | |
1da177e4 LT |
2112 | EXPORT_SYMBOL(vsscanf); |
2113 | ||
2114 | /** | |
2115 | * sscanf - Unformat a buffer into a list of arguments | |
2116 | * @buf: input buffer | |
2117 | * @fmt: formatting of buffer | |
2118 | * @...: resulting arguments | |
2119 | */ | |
7b9186f5 | 2120 | int sscanf(const char *buf, const char *fmt, ...) |
1da177e4 LT |
2121 | { |
2122 | va_list args; | |
2123 | int i; | |
2124 | ||
7b9186f5 AGR |
2125 | va_start(args, fmt); |
2126 | i = vsscanf(buf, fmt, args); | |
1da177e4 | 2127 | va_end(args); |
7b9186f5 | 2128 | |
1da177e4 LT |
2129 | return i; |
2130 | } | |
1da177e4 | 2131 | EXPORT_SYMBOL(sscanf); |