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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 | 29 | #include <asm/div64.h> |
deac93df | 30 | #include <asm/sections.h> /* for dereference_function_descriptor() */ |
1da177e4 | 31 | |
9b706aee DV |
32 | /* Works only for digits and letters, but small and fast */ |
33 | #define TOLOWER(x) ((x) | 0x20) | |
34 | ||
1da177e4 LT |
35 | /** |
36 | * simple_strtoul - convert a string to an unsigned long | |
37 | * @cp: The start of the string | |
38 | * @endp: A pointer to the end of the parsed string will be placed here | |
39 | * @base: The number base to use | |
40 | */ | |
41 | unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base) | |
42 | { | |
43 | unsigned long result = 0,value; | |
44 | ||
45 | if (!base) { | |
46 | base = 10; | |
47 | if (*cp == '0') { | |
48 | base = 8; | |
49 | cp++; | |
9b706aee | 50 | if ((TOLOWER(*cp) == 'x') && isxdigit(cp[1])) { |
1da177e4 LT |
51 | cp++; |
52 | base = 16; | |
53 | } | |
54 | } | |
55 | } else if (base == 16) { | |
9b706aee | 56 | if (cp[0] == '0' && TOLOWER(cp[1]) == 'x') |
1da177e4 LT |
57 | cp += 2; |
58 | } | |
59 | while (isxdigit(*cp) && | |
9b706aee | 60 | (value = isdigit(*cp) ? *cp-'0' : TOLOWER(*cp)-'a'+10) < base) { |
1da177e4 LT |
61 | result = result*base + value; |
62 | cp++; | |
63 | } | |
64 | if (endp) | |
65 | *endp = (char *)cp; | |
66 | return result; | |
67 | } | |
68 | ||
69 | EXPORT_SYMBOL(simple_strtoul); | |
70 | ||
71 | /** | |
72 | * simple_strtol - convert a string to a signed long | |
73 | * @cp: The start of the string | |
74 | * @endp: A pointer to the end of the parsed string will be placed here | |
75 | * @base: The number base to use | |
76 | */ | |
77 | long simple_strtol(const char *cp,char **endp,unsigned int base) | |
78 | { | |
79 | if(*cp=='-') | |
80 | return -simple_strtoul(cp+1,endp,base); | |
81 | return simple_strtoul(cp,endp,base); | |
82 | } | |
83 | ||
84 | EXPORT_SYMBOL(simple_strtol); | |
85 | ||
86 | /** | |
87 | * simple_strtoull - convert a string to an unsigned long long | |
88 | * @cp: The start of the string | |
89 | * @endp: A pointer to the end of the parsed string will be placed here | |
90 | * @base: The number base to use | |
91 | */ | |
92 | unsigned long long simple_strtoull(const char *cp,char **endp,unsigned int base) | |
93 | { | |
94 | unsigned long long result = 0,value; | |
95 | ||
96 | if (!base) { | |
97 | base = 10; | |
98 | if (*cp == '0') { | |
99 | base = 8; | |
100 | cp++; | |
9b706aee | 101 | if ((TOLOWER(*cp) == 'x') && isxdigit(cp[1])) { |
1da177e4 LT |
102 | cp++; |
103 | base = 16; | |
104 | } | |
105 | } | |
106 | } else if (base == 16) { | |
9b706aee | 107 | if (cp[0] == '0' && TOLOWER(cp[1]) == 'x') |
1da177e4 LT |
108 | cp += 2; |
109 | } | |
9b706aee DV |
110 | while (isxdigit(*cp) |
111 | && (value = isdigit(*cp) ? *cp-'0' : TOLOWER(*cp)-'a'+10) < base) { | |
1da177e4 LT |
112 | result = result*base + value; |
113 | cp++; | |
114 | } | |
115 | if (endp) | |
116 | *endp = (char *)cp; | |
117 | return result; | |
118 | } | |
119 | ||
120 | EXPORT_SYMBOL(simple_strtoull); | |
121 | ||
122 | /** | |
123 | * simple_strtoll - convert a string to a signed long long | |
124 | * @cp: The start of the string | |
125 | * @endp: A pointer to the end of the parsed string will be placed here | |
126 | * @base: The number base to use | |
127 | */ | |
128 | long long simple_strtoll(const char *cp,char **endp,unsigned int base) | |
129 | { | |
130 | if(*cp=='-') | |
131 | return -simple_strtoull(cp+1,endp,base); | |
132 | return simple_strtoull(cp,endp,base); | |
133 | } | |
134 | ||
06b2a76d YY |
135 | |
136 | /** | |
137 | * strict_strtoul - convert a string to an unsigned long strictly | |
138 | * @cp: The string to be converted | |
139 | * @base: The number base to use | |
140 | * @res: The converted result value | |
141 | * | |
142 | * strict_strtoul converts a string to an unsigned long only if the | |
143 | * string is really an unsigned long string, any string containing | |
144 | * any invalid char at the tail will be rejected and -EINVAL is returned, | |
145 | * only a newline char at the tail is acceptible because people generally | |
146 | * change a module parameter in the following way: | |
147 | * | |
148 | * echo 1024 > /sys/module/e1000/parameters/copybreak | |
149 | * | |
150 | * echo will append a newline to the tail. | |
151 | * | |
152 | * It returns 0 if conversion is successful and *res is set to the converted | |
153 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
154 | * | |
155 | * simple_strtoul just ignores the successive invalid characters and | |
156 | * return the converted value of prefix part of the string. | |
157 | */ | |
158 | int strict_strtoul(const char *cp, unsigned int base, unsigned long *res); | |
159 | ||
160 | /** | |
161 | * strict_strtol - convert a string to a long strictly | |
162 | * @cp: The string to be converted | |
163 | * @base: The number base to use | |
164 | * @res: The converted result value | |
165 | * | |
166 | * strict_strtol is similiar to strict_strtoul, but it allows the first | |
167 | * character of a string is '-'. | |
168 | * | |
169 | * It returns 0 if conversion is successful and *res is set to the converted | |
170 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
171 | */ | |
172 | int strict_strtol(const char *cp, unsigned int base, long *res); | |
173 | ||
174 | /** | |
175 | * strict_strtoull - convert a string to an unsigned long long strictly | |
176 | * @cp: The string to be converted | |
177 | * @base: The number base to use | |
178 | * @res: The converted result value | |
179 | * | |
180 | * strict_strtoull converts a string to an unsigned long long only if the | |
181 | * string is really an unsigned long long string, any string containing | |
182 | * any invalid char at the tail will be rejected and -EINVAL is returned, | |
183 | * only a newline char at the tail is acceptible because people generally | |
184 | * change a module parameter in the following way: | |
185 | * | |
186 | * echo 1024 > /sys/module/e1000/parameters/copybreak | |
187 | * | |
188 | * echo will append a newline to the tail of the string. | |
189 | * | |
190 | * It returns 0 if conversion is successful and *res is set to the converted | |
191 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
192 | * | |
193 | * simple_strtoull just ignores the successive invalid characters and | |
194 | * return the converted value of prefix part of the string. | |
195 | */ | |
196 | int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res); | |
197 | ||
198 | /** | |
199 | * strict_strtoll - convert a string to a long long strictly | |
200 | * @cp: The string to be converted | |
201 | * @base: The number base to use | |
202 | * @res: The converted result value | |
203 | * | |
204 | * strict_strtoll is similiar to strict_strtoull, but it allows the first | |
205 | * character of a string is '-'. | |
206 | * | |
207 | * It returns 0 if conversion is successful and *res is set to the converted | |
208 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
209 | */ | |
210 | int strict_strtoll(const char *cp, unsigned int base, long long *res); | |
211 | ||
212 | #define define_strict_strtoux(type, valtype) \ | |
213 | int strict_strtou##type(const char *cp, unsigned int base, valtype *res)\ | |
214 | { \ | |
215 | char *tail; \ | |
216 | valtype val; \ | |
217 | size_t len; \ | |
218 | \ | |
219 | *res = 0; \ | |
220 | len = strlen(cp); \ | |
221 | if (len == 0) \ | |
222 | return -EINVAL; \ | |
223 | \ | |
29a6d39b | 224 | val = simple_strtou##type(cp, &tail, base); \ |
06b2a76d YY |
225 | if ((*tail == '\0') || \ |
226 | ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {\ | |
227 | *res = val; \ | |
228 | return 0; \ | |
229 | } \ | |
230 | \ | |
231 | return -EINVAL; \ | |
232 | } \ | |
233 | ||
234 | #define define_strict_strtox(type, valtype) \ | |
235 | int strict_strto##type(const char *cp, unsigned int base, valtype *res) \ | |
236 | { \ | |
237 | int ret; \ | |
238 | if (*cp == '-') { \ | |
239 | ret = strict_strtou##type(cp+1, base, res); \ | |
4f9d5f4a | 240 | if (!ret) \ |
06b2a76d YY |
241 | *res = -(*res); \ |
242 | } else \ | |
243 | ret = strict_strtou##type(cp, base, res); \ | |
244 | \ | |
245 | return ret; \ | |
246 | } \ | |
247 | ||
248 | define_strict_strtoux(l, unsigned long) | |
249 | define_strict_strtox(l, long) | |
250 | define_strict_strtoux(ll, unsigned long long) | |
251 | define_strict_strtox(ll, long long) | |
252 | ||
253 | EXPORT_SYMBOL(strict_strtoul); | |
254 | EXPORT_SYMBOL(strict_strtol); | |
255 | EXPORT_SYMBOL(strict_strtoll); | |
256 | EXPORT_SYMBOL(strict_strtoull); | |
257 | ||
1da177e4 LT |
258 | static int skip_atoi(const char **s) |
259 | { | |
260 | int i=0; | |
261 | ||
262 | while (isdigit(**s)) | |
263 | i = i*10 + *((*s)++) - '0'; | |
264 | return i; | |
265 | } | |
266 | ||
4277eedd DV |
267 | /* Decimal conversion is by far the most typical, and is used |
268 | * for /proc and /sys data. This directly impacts e.g. top performance | |
269 | * with many processes running. We optimize it for speed | |
270 | * using code from | |
271 | * http://www.cs.uiowa.edu/~jones/bcd/decimal.html | |
272 | * (with permission from the author, Douglas W. Jones). */ | |
273 | ||
274 | /* Formats correctly any integer in [0,99999]. | |
275 | * Outputs from one to five digits depending on input. | |
276 | * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */ | |
277 | static char* put_dec_trunc(char *buf, unsigned q) | |
278 | { | |
279 | unsigned d3, d2, d1, d0; | |
280 | d1 = (q>>4) & 0xf; | |
281 | d2 = (q>>8) & 0xf; | |
282 | d3 = (q>>12); | |
283 | ||
284 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); | |
285 | q = (d0 * 0xcd) >> 11; | |
286 | d0 = d0 - 10*q; | |
287 | *buf++ = d0 + '0'; /* least significant digit */ | |
288 | d1 = q + 9*d3 + 5*d2 + d1; | |
289 | if (d1 != 0) { | |
290 | q = (d1 * 0xcd) >> 11; | |
291 | d1 = d1 - 10*q; | |
292 | *buf++ = d1 + '0'; /* next digit */ | |
293 | ||
294 | d2 = q + 2*d2; | |
295 | if ((d2 != 0) || (d3 != 0)) { | |
296 | q = (d2 * 0xd) >> 7; | |
297 | d2 = d2 - 10*q; | |
298 | *buf++ = d2 + '0'; /* next digit */ | |
299 | ||
300 | d3 = q + 4*d3; | |
301 | if (d3 != 0) { | |
302 | q = (d3 * 0xcd) >> 11; | |
303 | d3 = d3 - 10*q; | |
304 | *buf++ = d3 + '0'; /* next digit */ | |
305 | if (q != 0) | |
306 | *buf++ = q + '0'; /* most sign. digit */ | |
307 | } | |
308 | } | |
309 | } | |
310 | return buf; | |
311 | } | |
312 | /* Same with if's removed. Always emits five digits */ | |
313 | static char* put_dec_full(char *buf, unsigned q) | |
314 | { | |
315 | /* BTW, if q is in [0,9999], 8-bit ints will be enough, */ | |
316 | /* but anyway, gcc produces better code with full-sized ints */ | |
317 | unsigned d3, d2, d1, d0; | |
318 | d1 = (q>>4) & 0xf; | |
319 | d2 = (q>>8) & 0xf; | |
320 | d3 = (q>>12); | |
321 | ||
322 | /* Possible ways to approx. divide by 10 */ | |
323 | /* gcc -O2 replaces multiply with shifts and adds */ | |
324 | // (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386) | |
325 | // (x * 0x67) >> 10: 1100111 | |
326 | // (x * 0x34) >> 9: 110100 - same | |
327 | // (x * 0x1a) >> 8: 11010 - same | |
328 | // (x * 0x0d) >> 7: 1101 - same, shortest code (on i386) | |
329 | ||
330 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); | |
331 | q = (d0 * 0xcd) >> 11; | |
332 | d0 = d0 - 10*q; | |
333 | *buf++ = d0 + '0'; | |
334 | d1 = q + 9*d3 + 5*d2 + d1; | |
335 | q = (d1 * 0xcd) >> 11; | |
336 | d1 = d1 - 10*q; | |
337 | *buf++ = d1 + '0'; | |
338 | ||
339 | d2 = q + 2*d2; | |
340 | q = (d2 * 0xd) >> 7; | |
341 | d2 = d2 - 10*q; | |
342 | *buf++ = d2 + '0'; | |
343 | ||
344 | d3 = q + 4*d3; | |
345 | q = (d3 * 0xcd) >> 11; /* - shorter code */ | |
346 | /* q = (d3 * 0x67) >> 10; - would also work */ | |
347 | d3 = d3 - 10*q; | |
348 | *buf++ = d3 + '0'; | |
349 | *buf++ = q + '0'; | |
350 | return buf; | |
351 | } | |
352 | /* No inlining helps gcc to use registers better */ | |
353 | static noinline char* put_dec(char *buf, unsigned long long num) | |
354 | { | |
355 | while (1) { | |
356 | unsigned rem; | |
357 | if (num < 100000) | |
358 | return put_dec_trunc(buf, num); | |
359 | rem = do_div(num, 100000); | |
360 | buf = put_dec_full(buf, rem); | |
361 | } | |
362 | } | |
363 | ||
1da177e4 LT |
364 | #define ZEROPAD 1 /* pad with zero */ |
365 | #define SIGN 2 /* unsigned/signed long */ | |
366 | #define PLUS 4 /* show plus */ | |
367 | #define SPACE 8 /* space if plus */ | |
368 | #define LEFT 16 /* left justified */ | |
9b706aee DV |
369 | #define SMALL 32 /* Must be 32 == 0x20 */ |
370 | #define SPECIAL 64 /* 0x */ | |
1da177e4 | 371 | |
b39a7340 | 372 | static char *number(char *buf, char *end, unsigned long long num, int base, int size, int precision, int type) |
1da177e4 | 373 | { |
9b706aee DV |
374 | /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ |
375 | static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ | |
376 | ||
377 | char tmp[66]; | |
378 | char sign; | |
379 | char locase; | |
b39a7340 | 380 | int need_pfx = ((type & SPECIAL) && base != 10); |
1da177e4 LT |
381 | int i; |
382 | ||
9b706aee DV |
383 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
384 | * produces same digits or (maybe lowercased) letters */ | |
385 | locase = (type & SMALL); | |
1da177e4 LT |
386 | if (type & LEFT) |
387 | type &= ~ZEROPAD; | |
1da177e4 LT |
388 | sign = 0; |
389 | if (type & SIGN) { | |
390 | if ((signed long long) num < 0) { | |
391 | sign = '-'; | |
392 | num = - (signed long long) num; | |
393 | size--; | |
394 | } else if (type & PLUS) { | |
395 | sign = '+'; | |
396 | size--; | |
397 | } else if (type & SPACE) { | |
398 | sign = ' '; | |
399 | size--; | |
400 | } | |
401 | } | |
b39a7340 DV |
402 | if (need_pfx) { |
403 | size--; | |
1da177e4 | 404 | if (base == 16) |
1da177e4 LT |
405 | size--; |
406 | } | |
b39a7340 DV |
407 | |
408 | /* generate full string in tmp[], in reverse order */ | |
1da177e4 LT |
409 | i = 0; |
410 | if (num == 0) | |
b39a7340 | 411 | tmp[i++] = '0'; |
4277eedd DV |
412 | /* Generic code, for any base: |
413 | else do { | |
9b706aee | 414 | tmp[i++] = (digits[do_div(num,base)] | locase); |
4277eedd DV |
415 | } while (num != 0); |
416 | */ | |
b39a7340 DV |
417 | else if (base != 10) { /* 8 or 16 */ |
418 | int mask = base - 1; | |
419 | int shift = 3; | |
420 | if (base == 16) shift = 4; | |
421 | do { | |
9b706aee | 422 | tmp[i++] = (digits[((unsigned char)num) & mask] | locase); |
b39a7340 DV |
423 | num >>= shift; |
424 | } while (num); | |
4277eedd DV |
425 | } else { /* base 10 */ |
426 | i = put_dec(tmp, num) - tmp; | |
427 | } | |
b39a7340 DV |
428 | |
429 | /* printing 100 using %2d gives "100", not "00" */ | |
1da177e4 LT |
430 | if (i > precision) |
431 | precision = i; | |
b39a7340 | 432 | /* leading space padding */ |
1da177e4 | 433 | size -= precision; |
b39a7340 DV |
434 | if (!(type & (ZEROPAD+LEFT))) { |
435 | while(--size >= 0) { | |
f796937a | 436 | if (buf < end) |
1da177e4 LT |
437 | *buf = ' '; |
438 | ++buf; | |
439 | } | |
440 | } | |
b39a7340 | 441 | /* sign */ |
1da177e4 | 442 | if (sign) { |
f796937a | 443 | if (buf < end) |
1da177e4 LT |
444 | *buf = sign; |
445 | ++buf; | |
446 | } | |
b39a7340 DV |
447 | /* "0x" / "0" prefix */ |
448 | if (need_pfx) { | |
449 | if (buf < end) | |
450 | *buf = '0'; | |
451 | ++buf; | |
452 | if (base == 16) { | |
f796937a | 453 | if (buf < end) |
9b706aee | 454 | *buf = ('X' | locase); |
1da177e4 LT |
455 | ++buf; |
456 | } | |
457 | } | |
b39a7340 | 458 | /* zero or space padding */ |
1da177e4 | 459 | if (!(type & LEFT)) { |
b39a7340 DV |
460 | char c = (type & ZEROPAD) ? '0' : ' '; |
461 | while (--size >= 0) { | |
f796937a | 462 | if (buf < end) |
1da177e4 LT |
463 | *buf = c; |
464 | ++buf; | |
465 | } | |
466 | } | |
b39a7340 DV |
467 | /* hmm even more zero padding? */ |
468 | while (i <= --precision) { | |
f796937a | 469 | if (buf < end) |
1da177e4 LT |
470 | *buf = '0'; |
471 | ++buf; | |
472 | } | |
b39a7340 DV |
473 | /* actual digits of result */ |
474 | while (--i >= 0) { | |
f796937a | 475 | if (buf < end) |
1da177e4 LT |
476 | *buf = tmp[i]; |
477 | ++buf; | |
478 | } | |
b39a7340 DV |
479 | /* trailing space padding */ |
480 | while (--size >= 0) { | |
f796937a | 481 | if (buf < end) |
1da177e4 LT |
482 | *buf = ' '; |
483 | ++buf; | |
484 | } | |
485 | return buf; | |
486 | } | |
487 | ||
0f9bfa56 LT |
488 | static char *string(char *buf, char *end, char *s, int field_width, int precision, int flags) |
489 | { | |
490 | int len, i; | |
491 | ||
492 | if ((unsigned long)s < PAGE_SIZE) | |
493 | s = "<NULL>"; | |
494 | ||
495 | len = strnlen(s, precision); | |
496 | ||
497 | if (!(flags & LEFT)) { | |
498 | while (len < field_width--) { | |
499 | if (buf < end) | |
500 | *buf = ' '; | |
501 | ++buf; | |
502 | } | |
503 | } | |
504 | for (i = 0; i < len; ++i) { | |
505 | if (buf < end) | |
506 | *buf = *s; | |
507 | ++buf; ++s; | |
508 | } | |
509 | while (len < field_width--) { | |
510 | if (buf < end) | |
511 | *buf = ' '; | |
512 | ++buf; | |
513 | } | |
514 | return buf; | |
515 | } | |
516 | ||
0fe1ef24 LT |
517 | static char *symbol_string(char *buf, char *end, void *ptr, int field_width, int precision, int flags) |
518 | { | |
519 | unsigned long value = (unsigned long) ptr; | |
520 | #ifdef CONFIG_KALLSYMS | |
521 | char sym[KSYM_SYMBOL_LEN]; | |
522 | sprint_symbol(sym, value); | |
523 | return string(buf, end, sym, field_width, precision, flags); | |
524 | #else | |
525 | field_width = 2*sizeof(void *); | |
526 | flags |= SPECIAL | SMALL | ZEROPAD; | |
527 | return number(buf, end, value, 16, field_width, precision, flags); | |
528 | #endif | |
529 | } | |
530 | ||
4d8a743c LT |
531 | /* |
532 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
533 | * by an extra set of alphanumeric characters that are extended format | |
534 | * specifiers. | |
535 | * | |
0fe1ef24 LT |
536 | * Right now we just handle 'F' (for symbolic Function descriptor pointers) |
537 | * and 'S' (for Symbolic direct pointers), but this can easily be | |
538 | * extended in the future (network address types etc). | |
539 | * | |
540 | * The difference between 'S' and 'F' is that on ia64 and ppc64 function | |
541 | * pointers are really function descriptors, which contain a pointer the | |
542 | * real address. | |
4d8a743c LT |
543 | */ |
544 | static char *pointer(const char *fmt, char *buf, char *end, void *ptr, int field_width, int precision, int flags) | |
78a8bf69 | 545 | { |
0fe1ef24 LT |
546 | switch (*fmt) { |
547 | case 'F': | |
548 | ptr = dereference_function_descriptor(ptr); | |
549 | /* Fallthrough */ | |
550 | case 'S': | |
551 | return symbol_string(buf, end, ptr, field_width, precision, flags); | |
552 | } | |
78a8bf69 LT |
553 | flags |= SMALL; |
554 | if (field_width == -1) { | |
555 | field_width = 2*sizeof(void *); | |
556 | flags |= ZEROPAD; | |
557 | } | |
558 | return number(buf, end, (unsigned long) ptr, 16, field_width, precision, flags); | |
559 | } | |
560 | ||
1da177e4 LT |
561 | /** |
562 | * vsnprintf - Format a string and place it in a buffer | |
563 | * @buf: The buffer to place the result into | |
564 | * @size: The size of the buffer, including the trailing null space | |
565 | * @fmt: The format string to use | |
566 | * @args: Arguments for the format string | |
567 | * | |
20036fdc AK |
568 | * This function follows C99 vsnprintf, but has some extensions: |
569 | * %pS output the name of a text symbol | |
570 | * %pF output the name of a function pointer | |
571 | * | |
1da177e4 LT |
572 | * The return value is the number of characters which would |
573 | * be generated for the given input, excluding the trailing | |
574 | * '\0', as per ISO C99. If you want to have the exact | |
575 | * number of characters written into @buf as return value | |
72fd4a35 | 576 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
577 | * return is greater than or equal to @size, the resulting |
578 | * string is truncated. | |
579 | * | |
580 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 581 | * You probably want snprintf() instead. |
1da177e4 LT |
582 | */ |
583 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
584 | { | |
1da177e4 | 585 | unsigned long long num; |
0f9bfa56 | 586 | int base; |
1da177e4 | 587 | char *str, *end, c; |
1da177e4 LT |
588 | |
589 | int flags; /* flags to number() */ | |
590 | ||
591 | int field_width; /* width of output field */ | |
592 | int precision; /* min. # of digits for integers; max | |
593 | number of chars for from string */ | |
594 | int qualifier; /* 'h', 'l', or 'L' for integer fields */ | |
595 | /* 'z' support added 23/7/1999 S.H. */ | |
596 | /* 'z' changed to 'Z' --davidm 1/25/99 */ | |
80322306 | 597 | /* 't' added for ptrdiff_t */ |
1da177e4 | 598 | |
f796937a JF |
599 | /* Reject out-of-range values early. Large positive sizes are |
600 | used for unknown buffer sizes. */ | |
1da177e4 LT |
601 | if (unlikely((int) size < 0)) { |
602 | /* There can be only one.. */ | |
b39a7340 | 603 | static char warn = 1; |
1da177e4 LT |
604 | WARN_ON(warn); |
605 | warn = 0; | |
606 | return 0; | |
607 | } | |
608 | ||
609 | str = buf; | |
f796937a | 610 | end = buf + size; |
1da177e4 | 611 | |
f796937a JF |
612 | /* Make sure end is always >= buf */ |
613 | if (end < buf) { | |
614 | end = ((void *)-1); | |
615 | size = end - buf; | |
1da177e4 LT |
616 | } |
617 | ||
618 | for (; *fmt ; ++fmt) { | |
619 | if (*fmt != '%') { | |
f796937a | 620 | if (str < end) |
1da177e4 LT |
621 | *str = *fmt; |
622 | ++str; | |
623 | continue; | |
624 | } | |
625 | ||
626 | /* process flags */ | |
627 | flags = 0; | |
628 | repeat: | |
629 | ++fmt; /* this also skips first '%' */ | |
630 | switch (*fmt) { | |
631 | case '-': flags |= LEFT; goto repeat; | |
632 | case '+': flags |= PLUS; goto repeat; | |
633 | case ' ': flags |= SPACE; goto repeat; | |
634 | case '#': flags |= SPECIAL; goto repeat; | |
635 | case '0': flags |= ZEROPAD; goto repeat; | |
636 | } | |
637 | ||
638 | /* get field width */ | |
639 | field_width = -1; | |
640 | if (isdigit(*fmt)) | |
641 | field_width = skip_atoi(&fmt); | |
642 | else if (*fmt == '*') { | |
643 | ++fmt; | |
644 | /* it's the next argument */ | |
645 | field_width = va_arg(args, int); | |
646 | if (field_width < 0) { | |
647 | field_width = -field_width; | |
648 | flags |= LEFT; | |
649 | } | |
650 | } | |
651 | ||
652 | /* get the precision */ | |
653 | precision = -1; | |
654 | if (*fmt == '.') { | |
655 | ++fmt; | |
656 | if (isdigit(*fmt)) | |
657 | precision = skip_atoi(&fmt); | |
658 | else if (*fmt == '*') { | |
659 | ++fmt; | |
660 | /* it's the next argument */ | |
661 | precision = va_arg(args, int); | |
662 | } | |
663 | if (precision < 0) | |
664 | precision = 0; | |
665 | } | |
666 | ||
667 | /* get the conversion qualifier */ | |
668 | qualifier = -1; | |
669 | if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || | |
80322306 | 670 | *fmt =='Z' || *fmt == 'z' || *fmt == 't') { |
1da177e4 LT |
671 | qualifier = *fmt; |
672 | ++fmt; | |
673 | if (qualifier == 'l' && *fmt == 'l') { | |
674 | qualifier = 'L'; | |
675 | ++fmt; | |
676 | } | |
677 | } | |
678 | ||
679 | /* default base */ | |
680 | base = 10; | |
681 | ||
682 | switch (*fmt) { | |
683 | case 'c': | |
684 | if (!(flags & LEFT)) { | |
685 | while (--field_width > 0) { | |
f796937a | 686 | if (str < end) |
1da177e4 LT |
687 | *str = ' '; |
688 | ++str; | |
689 | } | |
690 | } | |
691 | c = (unsigned char) va_arg(args, int); | |
f796937a | 692 | if (str < end) |
1da177e4 LT |
693 | *str = c; |
694 | ++str; | |
695 | while (--field_width > 0) { | |
f796937a | 696 | if (str < end) |
1da177e4 LT |
697 | *str = ' '; |
698 | ++str; | |
699 | } | |
700 | continue; | |
701 | ||
702 | case 's': | |
0f9bfa56 | 703 | str = string(str, end, va_arg(args, char *), field_width, precision, flags); |
1da177e4 LT |
704 | continue; |
705 | ||
706 | case 'p': | |
4d8a743c LT |
707 | str = pointer(fmt+1, str, end, |
708 | va_arg(args, void *), | |
709 | field_width, precision, flags); | |
710 | /* Skip all alphanumeric pointer suffixes */ | |
711 | while (isalnum(fmt[1])) | |
712 | fmt++; | |
1da177e4 LT |
713 | continue; |
714 | ||
1da177e4 LT |
715 | case 'n': |
716 | /* FIXME: | |
717 | * What does C99 say about the overflow case here? */ | |
718 | if (qualifier == 'l') { | |
719 | long * ip = va_arg(args, long *); | |
720 | *ip = (str - buf); | |
721 | } else if (qualifier == 'Z' || qualifier == 'z') { | |
722 | size_t * ip = va_arg(args, size_t *); | |
723 | *ip = (str - buf); | |
724 | } else { | |
725 | int * ip = va_arg(args, int *); | |
726 | *ip = (str - buf); | |
727 | } | |
728 | continue; | |
729 | ||
730 | case '%': | |
f796937a | 731 | if (str < end) |
1da177e4 LT |
732 | *str = '%'; |
733 | ++str; | |
734 | continue; | |
735 | ||
736 | /* integer number formats - set up the flags and "break" */ | |
737 | case 'o': | |
738 | base = 8; | |
739 | break; | |
740 | ||
1da177e4 | 741 | case 'x': |
9b706aee DV |
742 | flags |= SMALL; |
743 | case 'X': | |
1da177e4 LT |
744 | base = 16; |
745 | break; | |
746 | ||
747 | case 'd': | |
748 | case 'i': | |
749 | flags |= SIGN; | |
750 | case 'u': | |
751 | break; | |
752 | ||
753 | default: | |
f796937a | 754 | if (str < end) |
1da177e4 LT |
755 | *str = '%'; |
756 | ++str; | |
757 | if (*fmt) { | |
f796937a | 758 | if (str < end) |
1da177e4 LT |
759 | *str = *fmt; |
760 | ++str; | |
761 | } else { | |
762 | --fmt; | |
763 | } | |
764 | continue; | |
765 | } | |
766 | if (qualifier == 'L') | |
767 | num = va_arg(args, long long); | |
768 | else if (qualifier == 'l') { | |
769 | num = va_arg(args, unsigned long); | |
770 | if (flags & SIGN) | |
771 | num = (signed long) num; | |
772 | } else if (qualifier == 'Z' || qualifier == 'z') { | |
773 | num = va_arg(args, size_t); | |
80322306 AV |
774 | } else if (qualifier == 't') { |
775 | num = va_arg(args, ptrdiff_t); | |
1da177e4 LT |
776 | } else if (qualifier == 'h') { |
777 | num = (unsigned short) va_arg(args, int); | |
778 | if (flags & SIGN) | |
779 | num = (signed short) num; | |
780 | } else { | |
781 | num = va_arg(args, unsigned int); | |
782 | if (flags & SIGN) | |
783 | num = (signed int) num; | |
784 | } | |
785 | str = number(str, end, num, base, | |
786 | field_width, precision, flags); | |
787 | } | |
f796937a JF |
788 | if (size > 0) { |
789 | if (str < end) | |
790 | *str = '\0'; | |
791 | else | |
0a6047ee | 792 | end[-1] = '\0'; |
f796937a JF |
793 | } |
794 | /* the trailing null byte doesn't count towards the total */ | |
1da177e4 LT |
795 | return str-buf; |
796 | } | |
797 | ||
798 | EXPORT_SYMBOL(vsnprintf); | |
799 | ||
800 | /** | |
801 | * vscnprintf - Format a string and place it in a buffer | |
802 | * @buf: The buffer to place the result into | |
803 | * @size: The size of the buffer, including the trailing null space | |
804 | * @fmt: The format string to use | |
805 | * @args: Arguments for the format string | |
806 | * | |
807 | * The return value is the number of characters which have been written into | |
808 | * the @buf not including the trailing '\0'. If @size is <= 0 the function | |
809 | * returns 0. | |
810 | * | |
811 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 812 | * You probably want scnprintf() instead. |
20036fdc AK |
813 | * |
814 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
815 | */ |
816 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
817 | { | |
818 | int i; | |
819 | ||
820 | i=vsnprintf(buf,size,fmt,args); | |
821 | return (i >= size) ? (size - 1) : i; | |
822 | } | |
823 | ||
824 | EXPORT_SYMBOL(vscnprintf); | |
825 | ||
826 | /** | |
827 | * snprintf - Format a string and place it in a buffer | |
828 | * @buf: The buffer to place the result into | |
829 | * @size: The size of the buffer, including the trailing null space | |
830 | * @fmt: The format string to use | |
831 | * @...: Arguments for the format string | |
832 | * | |
833 | * The return value is the number of characters which would be | |
834 | * generated for the given input, excluding the trailing null, | |
835 | * as per ISO C99. If the return is greater than or equal to | |
836 | * @size, the resulting string is truncated. | |
20036fdc AK |
837 | * |
838 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
839 | */ |
840 | int snprintf(char * buf, size_t size, const char *fmt, ...) | |
841 | { | |
842 | va_list args; | |
843 | int i; | |
844 | ||
845 | va_start(args, fmt); | |
846 | i=vsnprintf(buf,size,fmt,args); | |
847 | va_end(args); | |
848 | return i; | |
849 | } | |
850 | ||
851 | EXPORT_SYMBOL(snprintf); | |
852 | ||
853 | /** | |
854 | * scnprintf - Format a string and place it in a buffer | |
855 | * @buf: The buffer to place the result into | |
856 | * @size: The size of the buffer, including the trailing null space | |
857 | * @fmt: The format string to use | |
858 | * @...: Arguments for the format string | |
859 | * | |
860 | * The return value is the number of characters written into @buf not including | |
ea6f3281 | 861 | * the trailing '\0'. If @size is <= 0 the function returns 0. |
1da177e4 LT |
862 | */ |
863 | ||
864 | int scnprintf(char * buf, size_t size, const char *fmt, ...) | |
865 | { | |
866 | va_list args; | |
867 | int i; | |
868 | ||
869 | va_start(args, fmt); | |
870 | i = vsnprintf(buf, size, fmt, args); | |
871 | va_end(args); | |
872 | return (i >= size) ? (size - 1) : i; | |
873 | } | |
874 | EXPORT_SYMBOL(scnprintf); | |
875 | ||
876 | /** | |
877 | * vsprintf - Format a string and place it in a buffer | |
878 | * @buf: The buffer to place the result into | |
879 | * @fmt: The format string to use | |
880 | * @args: Arguments for the format string | |
881 | * | |
882 | * The function returns the number of characters written | |
72fd4a35 | 883 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
884 | * buffer overflows. |
885 | * | |
886 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 887 | * You probably want sprintf() instead. |
20036fdc AK |
888 | * |
889 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
890 | */ |
891 | int vsprintf(char *buf, const char *fmt, va_list args) | |
892 | { | |
893 | return vsnprintf(buf, INT_MAX, fmt, args); | |
894 | } | |
895 | ||
896 | EXPORT_SYMBOL(vsprintf); | |
897 | ||
898 | /** | |
899 | * sprintf - Format a string and place it in a buffer | |
900 | * @buf: The buffer to place the result into | |
901 | * @fmt: The format string to use | |
902 | * @...: Arguments for the format string | |
903 | * | |
904 | * The function returns the number of characters written | |
72fd4a35 | 905 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 | 906 | * buffer overflows. |
20036fdc AK |
907 | * |
908 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
909 | */ |
910 | int sprintf(char * buf, const char *fmt, ...) | |
911 | { | |
912 | va_list args; | |
913 | int i; | |
914 | ||
915 | va_start(args, fmt); | |
916 | i=vsnprintf(buf, INT_MAX, fmt, args); | |
917 | va_end(args); | |
918 | return i; | |
919 | } | |
920 | ||
921 | EXPORT_SYMBOL(sprintf); | |
922 | ||
923 | /** | |
924 | * vsscanf - Unformat a buffer into a list of arguments | |
925 | * @buf: input buffer | |
926 | * @fmt: format of buffer | |
927 | * @args: arguments | |
928 | */ | |
929 | int vsscanf(const char * buf, const char * fmt, va_list args) | |
930 | { | |
931 | const char *str = buf; | |
932 | char *next; | |
933 | char digit; | |
934 | int num = 0; | |
935 | int qualifier; | |
936 | int base; | |
937 | int field_width; | |
938 | int is_sign = 0; | |
939 | ||
940 | while(*fmt && *str) { | |
941 | /* skip any white space in format */ | |
942 | /* white space in format matchs any amount of | |
943 | * white space, including none, in the input. | |
944 | */ | |
945 | if (isspace(*fmt)) { | |
946 | while (isspace(*fmt)) | |
947 | ++fmt; | |
948 | while (isspace(*str)) | |
949 | ++str; | |
950 | } | |
951 | ||
952 | /* anything that is not a conversion must match exactly */ | |
953 | if (*fmt != '%' && *fmt) { | |
954 | if (*fmt++ != *str++) | |
955 | break; | |
956 | continue; | |
957 | } | |
958 | ||
959 | if (!*fmt) | |
960 | break; | |
961 | ++fmt; | |
962 | ||
963 | /* skip this conversion. | |
964 | * advance both strings to next white space | |
965 | */ | |
966 | if (*fmt == '*') { | |
967 | while (!isspace(*fmt) && *fmt) | |
968 | fmt++; | |
969 | while (!isspace(*str) && *str) | |
970 | str++; | |
971 | continue; | |
972 | } | |
973 | ||
974 | /* get field width */ | |
975 | field_width = -1; | |
976 | if (isdigit(*fmt)) | |
977 | field_width = skip_atoi(&fmt); | |
978 | ||
979 | /* get conversion qualifier */ | |
980 | qualifier = -1; | |
981 | if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || | |
982 | *fmt == 'Z' || *fmt == 'z') { | |
983 | qualifier = *fmt++; | |
984 | if (unlikely(qualifier == *fmt)) { | |
985 | if (qualifier == 'h') { | |
986 | qualifier = 'H'; | |
987 | fmt++; | |
988 | } else if (qualifier == 'l') { | |
989 | qualifier = 'L'; | |
990 | fmt++; | |
991 | } | |
992 | } | |
993 | } | |
994 | base = 10; | |
995 | is_sign = 0; | |
996 | ||
997 | if (!*fmt || !*str) | |
998 | break; | |
999 | ||
1000 | switch(*fmt++) { | |
1001 | case 'c': | |
1002 | { | |
1003 | char *s = (char *) va_arg(args,char*); | |
1004 | if (field_width == -1) | |
1005 | field_width = 1; | |
1006 | do { | |
1007 | *s++ = *str++; | |
1008 | } while (--field_width > 0 && *str); | |
1009 | num++; | |
1010 | } | |
1011 | continue; | |
1012 | case 's': | |
1013 | { | |
1014 | char *s = (char *) va_arg(args, char *); | |
1015 | if(field_width == -1) | |
1016 | field_width = INT_MAX; | |
1017 | /* first, skip leading white space in buffer */ | |
1018 | while (isspace(*str)) | |
1019 | str++; | |
1020 | ||
1021 | /* now copy until next white space */ | |
1022 | while (*str && !isspace(*str) && field_width--) { | |
1023 | *s++ = *str++; | |
1024 | } | |
1025 | *s = '\0'; | |
1026 | num++; | |
1027 | } | |
1028 | continue; | |
1029 | case 'n': | |
1030 | /* return number of characters read so far */ | |
1031 | { | |
1032 | int *i = (int *)va_arg(args,int*); | |
1033 | *i = str - buf; | |
1034 | } | |
1035 | continue; | |
1036 | case 'o': | |
1037 | base = 8; | |
1038 | break; | |
1039 | case 'x': | |
1040 | case 'X': | |
1041 | base = 16; | |
1042 | break; | |
1043 | case 'i': | |
1044 | base = 0; | |
1045 | case 'd': | |
1046 | is_sign = 1; | |
1047 | case 'u': | |
1048 | break; | |
1049 | case '%': | |
1050 | /* looking for '%' in str */ | |
1051 | if (*str++ != '%') | |
1052 | return num; | |
1053 | continue; | |
1054 | default: | |
1055 | /* invalid format; stop here */ | |
1056 | return num; | |
1057 | } | |
1058 | ||
1059 | /* have some sort of integer conversion. | |
1060 | * first, skip white space in buffer. | |
1061 | */ | |
1062 | while (isspace(*str)) | |
1063 | str++; | |
1064 | ||
1065 | digit = *str; | |
1066 | if (is_sign && digit == '-') | |
1067 | digit = *(str + 1); | |
1068 | ||
1069 | if (!digit | |
1070 | || (base == 16 && !isxdigit(digit)) | |
1071 | || (base == 10 && !isdigit(digit)) | |
1072 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
1073 | || (base == 0 && !isdigit(digit))) | |
1074 | break; | |
1075 | ||
1076 | switch(qualifier) { | |
1077 | case 'H': /* that's 'hh' in format */ | |
1078 | if (is_sign) { | |
1079 | signed char *s = (signed char *) va_arg(args,signed char *); | |
1080 | *s = (signed char) simple_strtol(str,&next,base); | |
1081 | } else { | |
1082 | unsigned char *s = (unsigned char *) va_arg(args, unsigned char *); | |
1083 | *s = (unsigned char) simple_strtoul(str, &next, base); | |
1084 | } | |
1085 | break; | |
1086 | case 'h': | |
1087 | if (is_sign) { | |
1088 | short *s = (short *) va_arg(args,short *); | |
1089 | *s = (short) simple_strtol(str,&next,base); | |
1090 | } else { | |
1091 | unsigned short *s = (unsigned short *) va_arg(args, unsigned short *); | |
1092 | *s = (unsigned short) simple_strtoul(str, &next, base); | |
1093 | } | |
1094 | break; | |
1095 | case 'l': | |
1096 | if (is_sign) { | |
1097 | long *l = (long *) va_arg(args,long *); | |
1098 | *l = simple_strtol(str,&next,base); | |
1099 | } else { | |
1100 | unsigned long *l = (unsigned long*) va_arg(args,unsigned long*); | |
1101 | *l = simple_strtoul(str,&next,base); | |
1102 | } | |
1103 | break; | |
1104 | case 'L': | |
1105 | if (is_sign) { | |
1106 | long long *l = (long long*) va_arg(args,long long *); | |
1107 | *l = simple_strtoll(str,&next,base); | |
1108 | } else { | |
1109 | unsigned long long *l = (unsigned long long*) va_arg(args,unsigned long long*); | |
1110 | *l = simple_strtoull(str,&next,base); | |
1111 | } | |
1112 | break; | |
1113 | case 'Z': | |
1114 | case 'z': | |
1115 | { | |
1116 | size_t *s = (size_t*) va_arg(args,size_t*); | |
1117 | *s = (size_t) simple_strtoul(str,&next,base); | |
1118 | } | |
1119 | break; | |
1120 | default: | |
1121 | if (is_sign) { | |
1122 | int *i = (int *) va_arg(args, int*); | |
1123 | *i = (int) simple_strtol(str,&next,base); | |
1124 | } else { | |
1125 | unsigned int *i = (unsigned int*) va_arg(args, unsigned int*); | |
1126 | *i = (unsigned int) simple_strtoul(str,&next,base); | |
1127 | } | |
1128 | break; | |
1129 | } | |
1130 | num++; | |
1131 | ||
1132 | if (!next) | |
1133 | break; | |
1134 | str = next; | |
1135 | } | |
c6b40d16 JB |
1136 | |
1137 | /* | |
1138 | * Now we've come all the way through so either the input string or the | |
1139 | * format ended. In the former case, there can be a %n at the current | |
1140 | * position in the format that needs to be filled. | |
1141 | */ | |
1142 | if (*fmt == '%' && *(fmt + 1) == 'n') { | |
1143 | int *p = (int *)va_arg(args, int *); | |
1144 | *p = str - buf; | |
1145 | } | |
1146 | ||
1da177e4 LT |
1147 | return num; |
1148 | } | |
1149 | ||
1150 | EXPORT_SYMBOL(vsscanf); | |
1151 | ||
1152 | /** | |
1153 | * sscanf - Unformat a buffer into a list of arguments | |
1154 | * @buf: input buffer | |
1155 | * @fmt: formatting of buffer | |
1156 | * @...: resulting arguments | |
1157 | */ | |
1158 | int sscanf(const char * buf, const char * fmt, ...) | |
1159 | { | |
1160 | va_list args; | |
1161 | int i; | |
1162 | ||
1163 | va_start(args,fmt); | |
1164 | i = vsscanf(buf,fmt,args); | |
1165 | va_end(args); | |
1166 | return i; | |
1167 | } | |
1168 | ||
1169 | EXPORT_SYMBOL(sscanf); |