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Commit | Line | Data |
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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 | ||
12 | /* | |
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> | |
1da177e4 | 27 | |
4e57b681 | 28 | #include <asm/page.h> /* for PAGE_SIZE */ |
1da177e4 LT |
29 | #include <asm/div64.h> |
30 | ||
9b706aee DV |
31 | /* Works only for digits and letters, but small and fast */ |
32 | #define TOLOWER(x) ((x) | 0x20) | |
33 | ||
1da177e4 LT |
34 | /** |
35 | * simple_strtoul - convert a string to an unsigned long | |
36 | * @cp: The start of the string | |
37 | * @endp: A pointer to the end of the parsed string will be placed here | |
38 | * @base: The number base to use | |
39 | */ | |
40 | unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base) | |
41 | { | |
42 | unsigned long result = 0,value; | |
43 | ||
44 | if (!base) { | |
45 | base = 10; | |
46 | if (*cp == '0') { | |
47 | base = 8; | |
48 | cp++; | |
9b706aee | 49 | if ((TOLOWER(*cp) == 'x') && isxdigit(cp[1])) { |
1da177e4 LT |
50 | cp++; |
51 | base = 16; | |
52 | } | |
53 | } | |
54 | } else if (base == 16) { | |
9b706aee | 55 | if (cp[0] == '0' && TOLOWER(cp[1]) == 'x') |
1da177e4 LT |
56 | cp += 2; |
57 | } | |
58 | while (isxdigit(*cp) && | |
9b706aee | 59 | (value = isdigit(*cp) ? *cp-'0' : TOLOWER(*cp)-'a'+10) < base) { |
1da177e4 LT |
60 | result = result*base + value; |
61 | cp++; | |
62 | } | |
63 | if (endp) | |
64 | *endp = (char *)cp; | |
65 | return result; | |
66 | } | |
67 | ||
68 | EXPORT_SYMBOL(simple_strtoul); | |
69 | ||
70 | /** | |
71 | * simple_strtol - convert a string to a signed long | |
72 | * @cp: The start of the string | |
73 | * @endp: A pointer to the end of the parsed string will be placed here | |
74 | * @base: The number base to use | |
75 | */ | |
76 | long simple_strtol(const char *cp,char **endp,unsigned int base) | |
77 | { | |
78 | if(*cp=='-') | |
79 | return -simple_strtoul(cp+1,endp,base); | |
80 | return simple_strtoul(cp,endp,base); | |
81 | } | |
82 | ||
83 | EXPORT_SYMBOL(simple_strtol); | |
84 | ||
85 | /** | |
86 | * simple_strtoull - convert a string to an unsigned long long | |
87 | * @cp: The start of the string | |
88 | * @endp: A pointer to the end of the parsed string will be placed here | |
89 | * @base: The number base to use | |
90 | */ | |
91 | unsigned long long simple_strtoull(const char *cp,char **endp,unsigned int base) | |
92 | { | |
93 | unsigned long long result = 0,value; | |
94 | ||
95 | if (!base) { | |
96 | base = 10; | |
97 | if (*cp == '0') { | |
98 | base = 8; | |
99 | cp++; | |
9b706aee | 100 | if ((TOLOWER(*cp) == 'x') && isxdigit(cp[1])) { |
1da177e4 LT |
101 | cp++; |
102 | base = 16; | |
103 | } | |
104 | } | |
105 | } else if (base == 16) { | |
9b706aee | 106 | if (cp[0] == '0' && TOLOWER(cp[1]) == 'x') |
1da177e4 LT |
107 | cp += 2; |
108 | } | |
9b706aee DV |
109 | while (isxdigit(*cp) |
110 | && (value = isdigit(*cp) ? *cp-'0' : TOLOWER(*cp)-'a'+10) < base) { | |
1da177e4 LT |
111 | result = result*base + value; |
112 | cp++; | |
113 | } | |
114 | if (endp) | |
115 | *endp = (char *)cp; | |
116 | return result; | |
117 | } | |
118 | ||
119 | EXPORT_SYMBOL(simple_strtoull); | |
120 | ||
121 | /** | |
122 | * simple_strtoll - convert a string to a signed long long | |
123 | * @cp: The start of the string | |
124 | * @endp: A pointer to the end of the parsed string will be placed here | |
125 | * @base: The number base to use | |
126 | */ | |
127 | long long simple_strtoll(const char *cp,char **endp,unsigned int base) | |
128 | { | |
129 | if(*cp=='-') | |
130 | return -simple_strtoull(cp+1,endp,base); | |
131 | return simple_strtoull(cp,endp,base); | |
132 | } | |
133 | ||
06b2a76d YY |
134 | |
135 | /** | |
136 | * strict_strtoul - convert a string to an unsigned long strictly | |
137 | * @cp: The string to be converted | |
138 | * @base: The number base to use | |
139 | * @res: The converted result value | |
140 | * | |
141 | * strict_strtoul converts a string to an unsigned long only if the | |
142 | * string is really an unsigned long string, any string containing | |
143 | * any invalid char at the tail will be rejected and -EINVAL is returned, | |
144 | * only a newline char at the tail is acceptible because people generally | |
145 | * change a module parameter in the following way: | |
146 | * | |
147 | * echo 1024 > /sys/module/e1000/parameters/copybreak | |
148 | * | |
149 | * echo will append a newline to the tail. | |
150 | * | |
151 | * It returns 0 if conversion is successful and *res is set to the converted | |
152 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
153 | * | |
154 | * simple_strtoul just ignores the successive invalid characters and | |
155 | * return the converted value of prefix part of the string. | |
156 | */ | |
157 | int strict_strtoul(const char *cp, unsigned int base, unsigned long *res); | |
158 | ||
159 | /** | |
160 | * strict_strtol - convert a string to a long strictly | |
161 | * @cp: The string to be converted | |
162 | * @base: The number base to use | |
163 | * @res: The converted result value | |
164 | * | |
165 | * strict_strtol is similiar to strict_strtoul, but it allows the first | |
166 | * character of a string is '-'. | |
167 | * | |
168 | * It returns 0 if conversion is successful and *res is set to the converted | |
169 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
170 | */ | |
171 | int strict_strtol(const char *cp, unsigned int base, long *res); | |
172 | ||
173 | /** | |
174 | * strict_strtoull - convert a string to an unsigned long long strictly | |
175 | * @cp: The string to be converted | |
176 | * @base: The number base to use | |
177 | * @res: The converted result value | |
178 | * | |
179 | * strict_strtoull converts a string to an unsigned long long only if the | |
180 | * string is really an unsigned long long string, any string containing | |
181 | * any invalid char at the tail will be rejected and -EINVAL is returned, | |
182 | * only a newline char at the tail is acceptible because people generally | |
183 | * change a module parameter in the following way: | |
184 | * | |
185 | * echo 1024 > /sys/module/e1000/parameters/copybreak | |
186 | * | |
187 | * echo will append a newline to the tail of the string. | |
188 | * | |
189 | * It returns 0 if conversion is successful and *res is set to the converted | |
190 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
191 | * | |
192 | * simple_strtoull just ignores the successive invalid characters and | |
193 | * return the converted value of prefix part of the string. | |
194 | */ | |
195 | int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res); | |
196 | ||
197 | /** | |
198 | * strict_strtoll - convert a string to a long long strictly | |
199 | * @cp: The string to be converted | |
200 | * @base: The number base to use | |
201 | * @res: The converted result value | |
202 | * | |
203 | * strict_strtoll is similiar to strict_strtoull, but it allows the first | |
204 | * character of a string is '-'. | |
205 | * | |
206 | * It returns 0 if conversion is successful and *res is set to the converted | |
207 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
208 | */ | |
209 | int strict_strtoll(const char *cp, unsigned int base, long long *res); | |
210 | ||
211 | #define define_strict_strtoux(type, valtype) \ | |
212 | int strict_strtou##type(const char *cp, unsigned int base, valtype *res)\ | |
213 | { \ | |
214 | char *tail; \ | |
215 | valtype val; \ | |
216 | size_t len; \ | |
217 | \ | |
218 | *res = 0; \ | |
219 | len = strlen(cp); \ | |
220 | if (len == 0) \ | |
221 | return -EINVAL; \ | |
222 | \ | |
223 | val = simple_strtoul(cp, &tail, base); \ | |
224 | if ((*tail == '\0') || \ | |
225 | ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {\ | |
226 | *res = val; \ | |
227 | return 0; \ | |
228 | } \ | |
229 | \ | |
230 | return -EINVAL; \ | |
231 | } \ | |
232 | ||
233 | #define define_strict_strtox(type, valtype) \ | |
234 | int strict_strto##type(const char *cp, unsigned int base, valtype *res) \ | |
235 | { \ | |
236 | int ret; \ | |
237 | if (*cp == '-') { \ | |
238 | ret = strict_strtou##type(cp+1, base, res); \ | |
4f9d5f4a | 239 | if (!ret) \ |
06b2a76d YY |
240 | *res = -(*res); \ |
241 | } else \ | |
242 | ret = strict_strtou##type(cp, base, res); \ | |
243 | \ | |
244 | return ret; \ | |
245 | } \ | |
246 | ||
247 | define_strict_strtoux(l, unsigned long) | |
248 | define_strict_strtox(l, long) | |
249 | define_strict_strtoux(ll, unsigned long long) | |
250 | define_strict_strtox(ll, long long) | |
251 | ||
252 | EXPORT_SYMBOL(strict_strtoul); | |
253 | EXPORT_SYMBOL(strict_strtol); | |
254 | EXPORT_SYMBOL(strict_strtoll); | |
255 | EXPORT_SYMBOL(strict_strtoull); | |
256 | ||
1da177e4 LT |
257 | static int skip_atoi(const char **s) |
258 | { | |
259 | int i=0; | |
260 | ||
261 | while (isdigit(**s)) | |
262 | i = i*10 + *((*s)++) - '0'; | |
263 | return i; | |
264 | } | |
265 | ||
4277eedd DV |
266 | /* Decimal conversion is by far the most typical, and is used |
267 | * for /proc and /sys data. This directly impacts e.g. top performance | |
268 | * with many processes running. We optimize it for speed | |
269 | * using code from | |
270 | * http://www.cs.uiowa.edu/~jones/bcd/decimal.html | |
271 | * (with permission from the author, Douglas W. Jones). */ | |
272 | ||
273 | /* Formats correctly any integer in [0,99999]. | |
274 | * Outputs from one to five digits depending on input. | |
275 | * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */ | |
276 | static char* put_dec_trunc(char *buf, unsigned q) | |
277 | { | |
278 | unsigned d3, d2, d1, d0; | |
279 | d1 = (q>>4) & 0xf; | |
280 | d2 = (q>>8) & 0xf; | |
281 | d3 = (q>>12); | |
282 | ||
283 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); | |
284 | q = (d0 * 0xcd) >> 11; | |
285 | d0 = d0 - 10*q; | |
286 | *buf++ = d0 + '0'; /* least significant digit */ | |
287 | d1 = q + 9*d3 + 5*d2 + d1; | |
288 | if (d1 != 0) { | |
289 | q = (d1 * 0xcd) >> 11; | |
290 | d1 = d1 - 10*q; | |
291 | *buf++ = d1 + '0'; /* next digit */ | |
292 | ||
293 | d2 = q + 2*d2; | |
294 | if ((d2 != 0) || (d3 != 0)) { | |
295 | q = (d2 * 0xd) >> 7; | |
296 | d2 = d2 - 10*q; | |
297 | *buf++ = d2 + '0'; /* next digit */ | |
298 | ||
299 | d3 = q + 4*d3; | |
300 | if (d3 != 0) { | |
301 | q = (d3 * 0xcd) >> 11; | |
302 | d3 = d3 - 10*q; | |
303 | *buf++ = d3 + '0'; /* next digit */ | |
304 | if (q != 0) | |
305 | *buf++ = q + '0'; /* most sign. digit */ | |
306 | } | |
307 | } | |
308 | } | |
309 | return buf; | |
310 | } | |
311 | /* Same with if's removed. Always emits five digits */ | |
312 | static char* put_dec_full(char *buf, unsigned q) | |
313 | { | |
314 | /* BTW, if q is in [0,9999], 8-bit ints will be enough, */ | |
315 | /* but anyway, gcc produces better code with full-sized ints */ | |
316 | unsigned d3, d2, d1, d0; | |
317 | d1 = (q>>4) & 0xf; | |
318 | d2 = (q>>8) & 0xf; | |
319 | d3 = (q>>12); | |
320 | ||
321 | /* Possible ways to approx. divide by 10 */ | |
322 | /* gcc -O2 replaces multiply with shifts and adds */ | |
323 | // (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386) | |
324 | // (x * 0x67) >> 10: 1100111 | |
325 | // (x * 0x34) >> 9: 110100 - same | |
326 | // (x * 0x1a) >> 8: 11010 - same | |
327 | // (x * 0x0d) >> 7: 1101 - same, shortest code (on i386) | |
328 | ||
329 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); | |
330 | q = (d0 * 0xcd) >> 11; | |
331 | d0 = d0 - 10*q; | |
332 | *buf++ = d0 + '0'; | |
333 | d1 = q + 9*d3 + 5*d2 + d1; | |
334 | q = (d1 * 0xcd) >> 11; | |
335 | d1 = d1 - 10*q; | |
336 | *buf++ = d1 + '0'; | |
337 | ||
338 | d2 = q + 2*d2; | |
339 | q = (d2 * 0xd) >> 7; | |
340 | d2 = d2 - 10*q; | |
341 | *buf++ = d2 + '0'; | |
342 | ||
343 | d3 = q + 4*d3; | |
344 | q = (d3 * 0xcd) >> 11; /* - shorter code */ | |
345 | /* q = (d3 * 0x67) >> 10; - would also work */ | |
346 | d3 = d3 - 10*q; | |
347 | *buf++ = d3 + '0'; | |
348 | *buf++ = q + '0'; | |
349 | return buf; | |
350 | } | |
351 | /* No inlining helps gcc to use registers better */ | |
352 | static noinline char* put_dec(char *buf, unsigned long long num) | |
353 | { | |
354 | while (1) { | |
355 | unsigned rem; | |
356 | if (num < 100000) | |
357 | return put_dec_trunc(buf, num); | |
358 | rem = do_div(num, 100000); | |
359 | buf = put_dec_full(buf, rem); | |
360 | } | |
361 | } | |
362 | ||
1da177e4 LT |
363 | #define ZEROPAD 1 /* pad with zero */ |
364 | #define SIGN 2 /* unsigned/signed long */ | |
365 | #define PLUS 4 /* show plus */ | |
366 | #define SPACE 8 /* space if plus */ | |
367 | #define LEFT 16 /* left justified */ | |
9b706aee DV |
368 | #define SMALL 32 /* Must be 32 == 0x20 */ |
369 | #define SPECIAL 64 /* 0x */ | |
1da177e4 | 370 | |
b39a7340 | 371 | static char *number(char *buf, char *end, unsigned long long num, int base, int size, int precision, int type) |
1da177e4 | 372 | { |
9b706aee DV |
373 | /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ |
374 | static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ | |
375 | ||
376 | char tmp[66]; | |
377 | char sign; | |
378 | char locase; | |
b39a7340 | 379 | int need_pfx = ((type & SPECIAL) && base != 10); |
1da177e4 LT |
380 | int i; |
381 | ||
9b706aee DV |
382 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
383 | * produces same digits or (maybe lowercased) letters */ | |
384 | locase = (type & SMALL); | |
1da177e4 LT |
385 | if (type & LEFT) |
386 | type &= ~ZEROPAD; | |
1da177e4 LT |
387 | sign = 0; |
388 | if (type & SIGN) { | |
389 | if ((signed long long) num < 0) { | |
390 | sign = '-'; | |
391 | num = - (signed long long) num; | |
392 | size--; | |
393 | } else if (type & PLUS) { | |
394 | sign = '+'; | |
395 | size--; | |
396 | } else if (type & SPACE) { | |
397 | sign = ' '; | |
398 | size--; | |
399 | } | |
400 | } | |
b39a7340 DV |
401 | if (need_pfx) { |
402 | size--; | |
1da177e4 | 403 | if (base == 16) |
1da177e4 LT |
404 | size--; |
405 | } | |
b39a7340 DV |
406 | |
407 | /* generate full string in tmp[], in reverse order */ | |
1da177e4 LT |
408 | i = 0; |
409 | if (num == 0) | |
b39a7340 | 410 | tmp[i++] = '0'; |
4277eedd DV |
411 | /* Generic code, for any base: |
412 | else do { | |
9b706aee | 413 | tmp[i++] = (digits[do_div(num,base)] | locase); |
4277eedd DV |
414 | } while (num != 0); |
415 | */ | |
b39a7340 DV |
416 | else if (base != 10) { /* 8 or 16 */ |
417 | int mask = base - 1; | |
418 | int shift = 3; | |
419 | if (base == 16) shift = 4; | |
420 | do { | |
9b706aee | 421 | tmp[i++] = (digits[((unsigned char)num) & mask] | locase); |
b39a7340 DV |
422 | num >>= shift; |
423 | } while (num); | |
4277eedd DV |
424 | } else { /* base 10 */ |
425 | i = put_dec(tmp, num) - tmp; | |
426 | } | |
b39a7340 DV |
427 | |
428 | /* printing 100 using %2d gives "100", not "00" */ | |
1da177e4 LT |
429 | if (i > precision) |
430 | precision = i; | |
b39a7340 | 431 | /* leading space padding */ |
1da177e4 | 432 | size -= precision; |
b39a7340 DV |
433 | if (!(type & (ZEROPAD+LEFT))) { |
434 | while(--size >= 0) { | |
f796937a | 435 | if (buf < end) |
1da177e4 LT |
436 | *buf = ' '; |
437 | ++buf; | |
438 | } | |
439 | } | |
b39a7340 | 440 | /* sign */ |
1da177e4 | 441 | if (sign) { |
f796937a | 442 | if (buf < end) |
1da177e4 LT |
443 | *buf = sign; |
444 | ++buf; | |
445 | } | |
b39a7340 DV |
446 | /* "0x" / "0" prefix */ |
447 | if (need_pfx) { | |
448 | if (buf < end) | |
449 | *buf = '0'; | |
450 | ++buf; | |
451 | if (base == 16) { | |
f796937a | 452 | if (buf < end) |
9b706aee | 453 | *buf = ('X' | locase); |
1da177e4 LT |
454 | ++buf; |
455 | } | |
456 | } | |
b39a7340 | 457 | /* zero or space padding */ |
1da177e4 | 458 | if (!(type & LEFT)) { |
b39a7340 DV |
459 | char c = (type & ZEROPAD) ? '0' : ' '; |
460 | while (--size >= 0) { | |
f796937a | 461 | if (buf < end) |
1da177e4 LT |
462 | *buf = c; |
463 | ++buf; | |
464 | } | |
465 | } | |
b39a7340 DV |
466 | /* hmm even more zero padding? */ |
467 | while (i <= --precision) { | |
f796937a | 468 | if (buf < end) |
1da177e4 LT |
469 | *buf = '0'; |
470 | ++buf; | |
471 | } | |
b39a7340 DV |
472 | /* actual digits of result */ |
473 | while (--i >= 0) { | |
f796937a | 474 | if (buf < end) |
1da177e4 LT |
475 | *buf = tmp[i]; |
476 | ++buf; | |
477 | } | |
b39a7340 DV |
478 | /* trailing space padding */ |
479 | while (--size >= 0) { | |
f796937a | 480 | if (buf < end) |
1da177e4 LT |
481 | *buf = ' '; |
482 | ++buf; | |
483 | } | |
484 | return buf; | |
485 | } | |
486 | ||
0f9bfa56 LT |
487 | static char *string(char *buf, char *end, char *s, int field_width, int precision, int flags) |
488 | { | |
489 | int len, i; | |
490 | ||
491 | if ((unsigned long)s < PAGE_SIZE) | |
492 | s = "<NULL>"; | |
493 | ||
494 | len = strnlen(s, precision); | |
495 | ||
496 | if (!(flags & LEFT)) { | |
497 | while (len < field_width--) { | |
498 | if (buf < end) | |
499 | *buf = ' '; | |
500 | ++buf; | |
501 | } | |
502 | } | |
503 | for (i = 0; i < len; ++i) { | |
504 | if (buf < end) | |
505 | *buf = *s; | |
506 | ++buf; ++s; | |
507 | } | |
508 | while (len < field_width--) { | |
509 | if (buf < end) | |
510 | *buf = ' '; | |
511 | ++buf; | |
512 | } | |
513 | return buf; | |
514 | } | |
515 | ||
0fe1ef24 LT |
516 | static inline void *dereference_function_descriptor(void *ptr) |
517 | { | |
518 | #if defined(CONFIG_IA64) || defined(CONFIG_PPC64) | |
519 | void *p; | |
520 | if (!probe_kernel_address(ptr, p)) | |
521 | ptr = p; | |
522 | #endif | |
523 | return ptr; | |
524 | } | |
525 | ||
526 | static char *symbol_string(char *buf, char *end, void *ptr, int field_width, int precision, int flags) | |
527 | { | |
528 | unsigned long value = (unsigned long) ptr; | |
529 | #ifdef CONFIG_KALLSYMS | |
530 | char sym[KSYM_SYMBOL_LEN]; | |
531 | sprint_symbol(sym, value); | |
532 | return string(buf, end, sym, field_width, precision, flags); | |
533 | #else | |
534 | field_width = 2*sizeof(void *); | |
535 | flags |= SPECIAL | SMALL | ZEROPAD; | |
536 | return number(buf, end, value, 16, field_width, precision, flags); | |
537 | #endif | |
538 | } | |
539 | ||
4d8a743c LT |
540 | /* |
541 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
542 | * by an extra set of alphanumeric characters that are extended format | |
543 | * specifiers. | |
544 | * | |
0fe1ef24 LT |
545 | * Right now we just handle 'F' (for symbolic Function descriptor pointers) |
546 | * and 'S' (for Symbolic direct pointers), but this can easily be | |
547 | * extended in the future (network address types etc). | |
548 | * | |
549 | * The difference between 'S' and 'F' is that on ia64 and ppc64 function | |
550 | * pointers are really function descriptors, which contain a pointer the | |
551 | * real address. | |
4d8a743c LT |
552 | */ |
553 | static char *pointer(const char *fmt, char *buf, char *end, void *ptr, int field_width, int precision, int flags) | |
78a8bf69 | 554 | { |
0fe1ef24 LT |
555 | switch (*fmt) { |
556 | case 'F': | |
557 | ptr = dereference_function_descriptor(ptr); | |
558 | /* Fallthrough */ | |
559 | case 'S': | |
560 | return symbol_string(buf, end, ptr, field_width, precision, flags); | |
561 | } | |
78a8bf69 LT |
562 | flags |= SMALL; |
563 | if (field_width == -1) { | |
564 | field_width = 2*sizeof(void *); | |
565 | flags |= ZEROPAD; | |
566 | } | |
567 | return number(buf, end, (unsigned long) ptr, 16, field_width, precision, flags); | |
568 | } | |
569 | ||
1da177e4 LT |
570 | /** |
571 | * vsnprintf - Format a string and place it in a buffer | |
572 | * @buf: The buffer to place the result into | |
573 | * @size: The size of the buffer, including the trailing null space | |
574 | * @fmt: The format string to use | |
575 | * @args: Arguments for the format string | |
576 | * | |
577 | * The return value is the number of characters which would | |
578 | * be generated for the given input, excluding the trailing | |
579 | * '\0', as per ISO C99. If you want to have the exact | |
580 | * number of characters written into @buf as return value | |
72fd4a35 | 581 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
582 | * return is greater than or equal to @size, the resulting |
583 | * string is truncated. | |
584 | * | |
585 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 586 | * You probably want snprintf() instead. |
1da177e4 LT |
587 | */ |
588 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
589 | { | |
1da177e4 | 590 | unsigned long long num; |
0f9bfa56 | 591 | int base; |
1da177e4 | 592 | char *str, *end, c; |
1da177e4 LT |
593 | |
594 | int flags; /* flags to number() */ | |
595 | ||
596 | int field_width; /* width of output field */ | |
597 | int precision; /* min. # of digits for integers; max | |
598 | number of chars for from string */ | |
599 | int qualifier; /* 'h', 'l', or 'L' for integer fields */ | |
600 | /* 'z' support added 23/7/1999 S.H. */ | |
601 | /* 'z' changed to 'Z' --davidm 1/25/99 */ | |
80322306 | 602 | /* 't' added for ptrdiff_t */ |
1da177e4 | 603 | |
f796937a JF |
604 | /* Reject out-of-range values early. Large positive sizes are |
605 | used for unknown buffer sizes. */ | |
1da177e4 LT |
606 | if (unlikely((int) size < 0)) { |
607 | /* There can be only one.. */ | |
b39a7340 | 608 | static char warn = 1; |
1da177e4 LT |
609 | WARN_ON(warn); |
610 | warn = 0; | |
611 | return 0; | |
612 | } | |
613 | ||
614 | str = buf; | |
f796937a | 615 | end = buf + size; |
1da177e4 | 616 | |
f796937a JF |
617 | /* Make sure end is always >= buf */ |
618 | if (end < buf) { | |
619 | end = ((void *)-1); | |
620 | size = end - buf; | |
1da177e4 LT |
621 | } |
622 | ||
623 | for (; *fmt ; ++fmt) { | |
624 | if (*fmt != '%') { | |
f796937a | 625 | if (str < end) |
1da177e4 LT |
626 | *str = *fmt; |
627 | ++str; | |
628 | continue; | |
629 | } | |
630 | ||
631 | /* process flags */ | |
632 | flags = 0; | |
633 | repeat: | |
634 | ++fmt; /* this also skips first '%' */ | |
635 | switch (*fmt) { | |
636 | case '-': flags |= LEFT; goto repeat; | |
637 | case '+': flags |= PLUS; goto repeat; | |
638 | case ' ': flags |= SPACE; goto repeat; | |
639 | case '#': flags |= SPECIAL; goto repeat; | |
640 | case '0': flags |= ZEROPAD; goto repeat; | |
641 | } | |
642 | ||
643 | /* get field width */ | |
644 | field_width = -1; | |
645 | if (isdigit(*fmt)) | |
646 | field_width = skip_atoi(&fmt); | |
647 | else if (*fmt == '*') { | |
648 | ++fmt; | |
649 | /* it's the next argument */ | |
650 | field_width = va_arg(args, int); | |
651 | if (field_width < 0) { | |
652 | field_width = -field_width; | |
653 | flags |= LEFT; | |
654 | } | |
655 | } | |
656 | ||
657 | /* get the precision */ | |
658 | precision = -1; | |
659 | if (*fmt == '.') { | |
660 | ++fmt; | |
661 | if (isdigit(*fmt)) | |
662 | precision = skip_atoi(&fmt); | |
663 | else if (*fmt == '*') { | |
664 | ++fmt; | |
665 | /* it's the next argument */ | |
666 | precision = va_arg(args, int); | |
667 | } | |
668 | if (precision < 0) | |
669 | precision = 0; | |
670 | } | |
671 | ||
672 | /* get the conversion qualifier */ | |
673 | qualifier = -1; | |
674 | if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || | |
80322306 | 675 | *fmt =='Z' || *fmt == 'z' || *fmt == 't') { |
1da177e4 LT |
676 | qualifier = *fmt; |
677 | ++fmt; | |
678 | if (qualifier == 'l' && *fmt == 'l') { | |
679 | qualifier = 'L'; | |
680 | ++fmt; | |
681 | } | |
682 | } | |
683 | ||
684 | /* default base */ | |
685 | base = 10; | |
686 | ||
687 | switch (*fmt) { | |
688 | case 'c': | |
689 | if (!(flags & LEFT)) { | |
690 | while (--field_width > 0) { | |
f796937a | 691 | if (str < end) |
1da177e4 LT |
692 | *str = ' '; |
693 | ++str; | |
694 | } | |
695 | } | |
696 | c = (unsigned char) va_arg(args, int); | |
f796937a | 697 | if (str < end) |
1da177e4 LT |
698 | *str = c; |
699 | ++str; | |
700 | while (--field_width > 0) { | |
f796937a | 701 | if (str < end) |
1da177e4 LT |
702 | *str = ' '; |
703 | ++str; | |
704 | } | |
705 | continue; | |
706 | ||
707 | case 's': | |
0f9bfa56 | 708 | str = string(str, end, va_arg(args, char *), field_width, precision, flags); |
1da177e4 LT |
709 | continue; |
710 | ||
711 | case 'p': | |
4d8a743c LT |
712 | str = pointer(fmt+1, str, end, |
713 | va_arg(args, void *), | |
714 | field_width, precision, flags); | |
715 | /* Skip all alphanumeric pointer suffixes */ | |
716 | while (isalnum(fmt[1])) | |
717 | fmt++; | |
1da177e4 LT |
718 | continue; |
719 | ||
1da177e4 LT |
720 | case 'n': |
721 | /* FIXME: | |
722 | * What does C99 say about the overflow case here? */ | |
723 | if (qualifier == 'l') { | |
724 | long * ip = va_arg(args, long *); | |
725 | *ip = (str - buf); | |
726 | } else if (qualifier == 'Z' || qualifier == 'z') { | |
727 | size_t * ip = va_arg(args, size_t *); | |
728 | *ip = (str - buf); | |
729 | } else { | |
730 | int * ip = va_arg(args, int *); | |
731 | *ip = (str - buf); | |
732 | } | |
733 | continue; | |
734 | ||
735 | case '%': | |
f796937a | 736 | if (str < end) |
1da177e4 LT |
737 | *str = '%'; |
738 | ++str; | |
739 | continue; | |
740 | ||
741 | /* integer number formats - set up the flags and "break" */ | |
742 | case 'o': | |
743 | base = 8; | |
744 | break; | |
745 | ||
1da177e4 | 746 | case 'x': |
9b706aee DV |
747 | flags |= SMALL; |
748 | case 'X': | |
1da177e4 LT |
749 | base = 16; |
750 | break; | |
751 | ||
752 | case 'd': | |
753 | case 'i': | |
754 | flags |= SIGN; | |
755 | case 'u': | |
756 | break; | |
757 | ||
758 | default: | |
f796937a | 759 | if (str < end) |
1da177e4 LT |
760 | *str = '%'; |
761 | ++str; | |
762 | if (*fmt) { | |
f796937a | 763 | if (str < end) |
1da177e4 LT |
764 | *str = *fmt; |
765 | ++str; | |
766 | } else { | |
767 | --fmt; | |
768 | } | |
769 | continue; | |
770 | } | |
771 | if (qualifier == 'L') | |
772 | num = va_arg(args, long long); | |
773 | else if (qualifier == 'l') { | |
774 | num = va_arg(args, unsigned long); | |
775 | if (flags & SIGN) | |
776 | num = (signed long) num; | |
777 | } else if (qualifier == 'Z' || qualifier == 'z') { | |
778 | num = va_arg(args, size_t); | |
80322306 AV |
779 | } else if (qualifier == 't') { |
780 | num = va_arg(args, ptrdiff_t); | |
1da177e4 LT |
781 | } else if (qualifier == 'h') { |
782 | num = (unsigned short) va_arg(args, int); | |
783 | if (flags & SIGN) | |
784 | num = (signed short) num; | |
785 | } else { | |
786 | num = va_arg(args, unsigned int); | |
787 | if (flags & SIGN) | |
788 | num = (signed int) num; | |
789 | } | |
790 | str = number(str, end, num, base, | |
791 | field_width, precision, flags); | |
792 | } | |
f796937a JF |
793 | if (size > 0) { |
794 | if (str < end) | |
795 | *str = '\0'; | |
796 | else | |
0a6047ee | 797 | end[-1] = '\0'; |
f796937a JF |
798 | } |
799 | /* the trailing null byte doesn't count towards the total */ | |
1da177e4 LT |
800 | return str-buf; |
801 | } | |
802 | ||
803 | EXPORT_SYMBOL(vsnprintf); | |
804 | ||
805 | /** | |
806 | * vscnprintf - Format a string and place it in a buffer | |
807 | * @buf: The buffer to place the result into | |
808 | * @size: The size of the buffer, including the trailing null space | |
809 | * @fmt: The format string to use | |
810 | * @args: Arguments for the format string | |
811 | * | |
812 | * The return value is the number of characters which have been written into | |
813 | * the @buf not including the trailing '\0'. If @size is <= 0 the function | |
814 | * returns 0. | |
815 | * | |
816 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 817 | * You probably want scnprintf() instead. |
1da177e4 LT |
818 | */ |
819 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
820 | { | |
821 | int i; | |
822 | ||
823 | i=vsnprintf(buf,size,fmt,args); | |
824 | return (i >= size) ? (size - 1) : i; | |
825 | } | |
826 | ||
827 | EXPORT_SYMBOL(vscnprintf); | |
828 | ||
829 | /** | |
830 | * snprintf - Format a string and place it in a buffer | |
831 | * @buf: The buffer to place the result into | |
832 | * @size: The size of the buffer, including the trailing null space | |
833 | * @fmt: The format string to use | |
834 | * @...: Arguments for the format string | |
835 | * | |
836 | * The return value is the number of characters which would be | |
837 | * generated for the given input, excluding the trailing null, | |
838 | * as per ISO C99. If the return is greater than or equal to | |
839 | * @size, the resulting string is truncated. | |
840 | */ | |
841 | int snprintf(char * buf, size_t size, const char *fmt, ...) | |
842 | { | |
843 | va_list args; | |
844 | int i; | |
845 | ||
846 | va_start(args, fmt); | |
847 | i=vsnprintf(buf,size,fmt,args); | |
848 | va_end(args); | |
849 | return i; | |
850 | } | |
851 | ||
852 | EXPORT_SYMBOL(snprintf); | |
853 | ||
854 | /** | |
855 | * scnprintf - Format a string and place it in a buffer | |
856 | * @buf: The buffer to place the result into | |
857 | * @size: The size of the buffer, including the trailing null space | |
858 | * @fmt: The format string to use | |
859 | * @...: Arguments for the format string | |
860 | * | |
861 | * The return value is the number of characters written into @buf not including | |
ea6f3281 | 862 | * the trailing '\0'. If @size is <= 0 the function returns 0. |
1da177e4 LT |
863 | */ |
864 | ||
865 | int scnprintf(char * buf, size_t size, const char *fmt, ...) | |
866 | { | |
867 | va_list args; | |
868 | int i; | |
869 | ||
870 | va_start(args, fmt); | |
871 | i = vsnprintf(buf, size, fmt, args); | |
872 | va_end(args); | |
873 | return (i >= size) ? (size - 1) : i; | |
874 | } | |
875 | EXPORT_SYMBOL(scnprintf); | |
876 | ||
877 | /** | |
878 | * vsprintf - Format a string and place it in a buffer | |
879 | * @buf: The buffer to place the result into | |
880 | * @fmt: The format string to use | |
881 | * @args: Arguments for the format string | |
882 | * | |
883 | * The function returns the number of characters written | |
72fd4a35 | 884 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
885 | * buffer overflows. |
886 | * | |
887 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 888 | * You probably want sprintf() instead. |
1da177e4 LT |
889 | */ |
890 | int vsprintf(char *buf, const char *fmt, va_list args) | |
891 | { | |
892 | return vsnprintf(buf, INT_MAX, fmt, args); | |
893 | } | |
894 | ||
895 | EXPORT_SYMBOL(vsprintf); | |
896 | ||
897 | /** | |
898 | * sprintf - Format a string and place it in a buffer | |
899 | * @buf: The buffer to place the result into | |
900 | * @fmt: The format string to use | |
901 | * @...: Arguments for the format string | |
902 | * | |
903 | * The function returns the number of characters written | |
72fd4a35 | 904 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 LT |
905 | * buffer overflows. |
906 | */ | |
907 | int sprintf(char * buf, const char *fmt, ...) | |
908 | { | |
909 | va_list args; | |
910 | int i; | |
911 | ||
912 | va_start(args, fmt); | |
913 | i=vsnprintf(buf, INT_MAX, fmt, args); | |
914 | va_end(args); | |
915 | return i; | |
916 | } | |
917 | ||
918 | EXPORT_SYMBOL(sprintf); | |
919 | ||
920 | /** | |
921 | * vsscanf - Unformat a buffer into a list of arguments | |
922 | * @buf: input buffer | |
923 | * @fmt: format of buffer | |
924 | * @args: arguments | |
925 | */ | |
926 | int vsscanf(const char * buf, const char * fmt, va_list args) | |
927 | { | |
928 | const char *str = buf; | |
929 | char *next; | |
930 | char digit; | |
931 | int num = 0; | |
932 | int qualifier; | |
933 | int base; | |
934 | int field_width; | |
935 | int is_sign = 0; | |
936 | ||
937 | while(*fmt && *str) { | |
938 | /* skip any white space in format */ | |
939 | /* white space in format matchs any amount of | |
940 | * white space, including none, in the input. | |
941 | */ | |
942 | if (isspace(*fmt)) { | |
943 | while (isspace(*fmt)) | |
944 | ++fmt; | |
945 | while (isspace(*str)) | |
946 | ++str; | |
947 | } | |
948 | ||
949 | /* anything that is not a conversion must match exactly */ | |
950 | if (*fmt != '%' && *fmt) { | |
951 | if (*fmt++ != *str++) | |
952 | break; | |
953 | continue; | |
954 | } | |
955 | ||
956 | if (!*fmt) | |
957 | break; | |
958 | ++fmt; | |
959 | ||
960 | /* skip this conversion. | |
961 | * advance both strings to next white space | |
962 | */ | |
963 | if (*fmt == '*') { | |
964 | while (!isspace(*fmt) && *fmt) | |
965 | fmt++; | |
966 | while (!isspace(*str) && *str) | |
967 | str++; | |
968 | continue; | |
969 | } | |
970 | ||
971 | /* get field width */ | |
972 | field_width = -1; | |
973 | if (isdigit(*fmt)) | |
974 | field_width = skip_atoi(&fmt); | |
975 | ||
976 | /* get conversion qualifier */ | |
977 | qualifier = -1; | |
978 | if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || | |
979 | *fmt == 'Z' || *fmt == 'z') { | |
980 | qualifier = *fmt++; | |
981 | if (unlikely(qualifier == *fmt)) { | |
982 | if (qualifier == 'h') { | |
983 | qualifier = 'H'; | |
984 | fmt++; | |
985 | } else if (qualifier == 'l') { | |
986 | qualifier = 'L'; | |
987 | fmt++; | |
988 | } | |
989 | } | |
990 | } | |
991 | base = 10; | |
992 | is_sign = 0; | |
993 | ||
994 | if (!*fmt || !*str) | |
995 | break; | |
996 | ||
997 | switch(*fmt++) { | |
998 | case 'c': | |
999 | { | |
1000 | char *s = (char *) va_arg(args,char*); | |
1001 | if (field_width == -1) | |
1002 | field_width = 1; | |
1003 | do { | |
1004 | *s++ = *str++; | |
1005 | } while (--field_width > 0 && *str); | |
1006 | num++; | |
1007 | } | |
1008 | continue; | |
1009 | case 's': | |
1010 | { | |
1011 | char *s = (char *) va_arg(args, char *); | |
1012 | if(field_width == -1) | |
1013 | field_width = INT_MAX; | |
1014 | /* first, skip leading white space in buffer */ | |
1015 | while (isspace(*str)) | |
1016 | str++; | |
1017 | ||
1018 | /* now copy until next white space */ | |
1019 | while (*str && !isspace(*str) && field_width--) { | |
1020 | *s++ = *str++; | |
1021 | } | |
1022 | *s = '\0'; | |
1023 | num++; | |
1024 | } | |
1025 | continue; | |
1026 | case 'n': | |
1027 | /* return number of characters read so far */ | |
1028 | { | |
1029 | int *i = (int *)va_arg(args,int*); | |
1030 | *i = str - buf; | |
1031 | } | |
1032 | continue; | |
1033 | case 'o': | |
1034 | base = 8; | |
1035 | break; | |
1036 | case 'x': | |
1037 | case 'X': | |
1038 | base = 16; | |
1039 | break; | |
1040 | case 'i': | |
1041 | base = 0; | |
1042 | case 'd': | |
1043 | is_sign = 1; | |
1044 | case 'u': | |
1045 | break; | |
1046 | case '%': | |
1047 | /* looking for '%' in str */ | |
1048 | if (*str++ != '%') | |
1049 | return num; | |
1050 | continue; | |
1051 | default: | |
1052 | /* invalid format; stop here */ | |
1053 | return num; | |
1054 | } | |
1055 | ||
1056 | /* have some sort of integer conversion. | |
1057 | * first, skip white space in buffer. | |
1058 | */ | |
1059 | while (isspace(*str)) | |
1060 | str++; | |
1061 | ||
1062 | digit = *str; | |
1063 | if (is_sign && digit == '-') | |
1064 | digit = *(str + 1); | |
1065 | ||
1066 | if (!digit | |
1067 | || (base == 16 && !isxdigit(digit)) | |
1068 | || (base == 10 && !isdigit(digit)) | |
1069 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
1070 | || (base == 0 && !isdigit(digit))) | |
1071 | break; | |
1072 | ||
1073 | switch(qualifier) { | |
1074 | case 'H': /* that's 'hh' in format */ | |
1075 | if (is_sign) { | |
1076 | signed char *s = (signed char *) va_arg(args,signed char *); | |
1077 | *s = (signed char) simple_strtol(str,&next,base); | |
1078 | } else { | |
1079 | unsigned char *s = (unsigned char *) va_arg(args, unsigned char *); | |
1080 | *s = (unsigned char) simple_strtoul(str, &next, base); | |
1081 | } | |
1082 | break; | |
1083 | case 'h': | |
1084 | if (is_sign) { | |
1085 | short *s = (short *) va_arg(args,short *); | |
1086 | *s = (short) simple_strtol(str,&next,base); | |
1087 | } else { | |
1088 | unsigned short *s = (unsigned short *) va_arg(args, unsigned short *); | |
1089 | *s = (unsigned short) simple_strtoul(str, &next, base); | |
1090 | } | |
1091 | break; | |
1092 | case 'l': | |
1093 | if (is_sign) { | |
1094 | long *l = (long *) va_arg(args,long *); | |
1095 | *l = simple_strtol(str,&next,base); | |
1096 | } else { | |
1097 | unsigned long *l = (unsigned long*) va_arg(args,unsigned long*); | |
1098 | *l = simple_strtoul(str,&next,base); | |
1099 | } | |
1100 | break; | |
1101 | case 'L': | |
1102 | if (is_sign) { | |
1103 | long long *l = (long long*) va_arg(args,long long *); | |
1104 | *l = simple_strtoll(str,&next,base); | |
1105 | } else { | |
1106 | unsigned long long *l = (unsigned long long*) va_arg(args,unsigned long long*); | |
1107 | *l = simple_strtoull(str,&next,base); | |
1108 | } | |
1109 | break; | |
1110 | case 'Z': | |
1111 | case 'z': | |
1112 | { | |
1113 | size_t *s = (size_t*) va_arg(args,size_t*); | |
1114 | *s = (size_t) simple_strtoul(str,&next,base); | |
1115 | } | |
1116 | break; | |
1117 | default: | |
1118 | if (is_sign) { | |
1119 | int *i = (int *) va_arg(args, int*); | |
1120 | *i = (int) simple_strtol(str,&next,base); | |
1121 | } else { | |
1122 | unsigned int *i = (unsigned int*) va_arg(args, unsigned int*); | |
1123 | *i = (unsigned int) simple_strtoul(str,&next,base); | |
1124 | } | |
1125 | break; | |
1126 | } | |
1127 | num++; | |
1128 | ||
1129 | if (!next) | |
1130 | break; | |
1131 | str = next; | |
1132 | } | |
c6b40d16 JB |
1133 | |
1134 | /* | |
1135 | * Now we've come all the way through so either the input string or the | |
1136 | * format ended. In the former case, there can be a %n at the current | |
1137 | * position in the format that needs to be filled. | |
1138 | */ | |
1139 | if (*fmt == '%' && *(fmt + 1) == 'n') { | |
1140 | int *p = (int *)va_arg(args, int *); | |
1141 | *p = str - buf; | |
1142 | } | |
1143 | ||
1da177e4 LT |
1144 | return num; |
1145 | } | |
1146 | ||
1147 | EXPORT_SYMBOL(vsscanf); | |
1148 | ||
1149 | /** | |
1150 | * sscanf - Unformat a buffer into a list of arguments | |
1151 | * @buf: input buffer | |
1152 | * @fmt: formatting of buffer | |
1153 | * @...: resulting arguments | |
1154 | */ | |
1155 | int sscanf(const char * buf, const char * fmt, ...) | |
1156 | { | |
1157 | va_list args; | |
1158 | int i; | |
1159 | ||
1160 | va_start(args,fmt); | |
1161 | i = vsscanf(buf,fmt,args); | |
1162 | va_end(args); | |
1163 | return i; | |
1164 | } | |
1165 | ||
1166 | EXPORT_SYMBOL(sscanf); |