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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 | * | |
568 | * The return value is the number of characters which would | |
569 | * be generated for the given input, excluding the trailing | |
570 | * '\0', as per ISO C99. If you want to have the exact | |
571 | * number of characters written into @buf as return value | |
72fd4a35 | 572 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
573 | * return is greater than or equal to @size, the resulting |
574 | * string is truncated. | |
575 | * | |
576 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 577 | * You probably want snprintf() instead. |
1da177e4 LT |
578 | */ |
579 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
580 | { | |
1da177e4 | 581 | unsigned long long num; |
0f9bfa56 | 582 | int base; |
1da177e4 | 583 | char *str, *end, c; |
1da177e4 LT |
584 | |
585 | int flags; /* flags to number() */ | |
586 | ||
587 | int field_width; /* width of output field */ | |
588 | int precision; /* min. # of digits for integers; max | |
589 | number of chars for from string */ | |
590 | int qualifier; /* 'h', 'l', or 'L' for integer fields */ | |
591 | /* 'z' support added 23/7/1999 S.H. */ | |
592 | /* 'z' changed to 'Z' --davidm 1/25/99 */ | |
80322306 | 593 | /* 't' added for ptrdiff_t */ |
1da177e4 | 594 | |
f796937a JF |
595 | /* Reject out-of-range values early. Large positive sizes are |
596 | used for unknown buffer sizes. */ | |
1da177e4 LT |
597 | if (unlikely((int) size < 0)) { |
598 | /* There can be only one.. */ | |
b39a7340 | 599 | static char warn = 1; |
1da177e4 LT |
600 | WARN_ON(warn); |
601 | warn = 0; | |
602 | return 0; | |
603 | } | |
604 | ||
605 | str = buf; | |
f796937a | 606 | end = buf + size; |
1da177e4 | 607 | |
f796937a JF |
608 | /* Make sure end is always >= buf */ |
609 | if (end < buf) { | |
610 | end = ((void *)-1); | |
611 | size = end - buf; | |
1da177e4 LT |
612 | } |
613 | ||
614 | for (; *fmt ; ++fmt) { | |
615 | if (*fmt != '%') { | |
f796937a | 616 | if (str < end) |
1da177e4 LT |
617 | *str = *fmt; |
618 | ++str; | |
619 | continue; | |
620 | } | |
621 | ||
622 | /* process flags */ | |
623 | flags = 0; | |
624 | repeat: | |
625 | ++fmt; /* this also skips first '%' */ | |
626 | switch (*fmt) { | |
627 | case '-': flags |= LEFT; goto repeat; | |
628 | case '+': flags |= PLUS; goto repeat; | |
629 | case ' ': flags |= SPACE; goto repeat; | |
630 | case '#': flags |= SPECIAL; goto repeat; | |
631 | case '0': flags |= ZEROPAD; goto repeat; | |
632 | } | |
633 | ||
634 | /* get field width */ | |
635 | field_width = -1; | |
636 | if (isdigit(*fmt)) | |
637 | field_width = skip_atoi(&fmt); | |
638 | else if (*fmt == '*') { | |
639 | ++fmt; | |
640 | /* it's the next argument */ | |
641 | field_width = va_arg(args, int); | |
642 | if (field_width < 0) { | |
643 | field_width = -field_width; | |
644 | flags |= LEFT; | |
645 | } | |
646 | } | |
647 | ||
648 | /* get the precision */ | |
649 | precision = -1; | |
650 | if (*fmt == '.') { | |
651 | ++fmt; | |
652 | if (isdigit(*fmt)) | |
653 | precision = skip_atoi(&fmt); | |
654 | else if (*fmt == '*') { | |
655 | ++fmt; | |
656 | /* it's the next argument */ | |
657 | precision = va_arg(args, int); | |
658 | } | |
659 | if (precision < 0) | |
660 | precision = 0; | |
661 | } | |
662 | ||
663 | /* get the conversion qualifier */ | |
664 | qualifier = -1; | |
665 | if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || | |
80322306 | 666 | *fmt =='Z' || *fmt == 'z' || *fmt == 't') { |
1da177e4 LT |
667 | qualifier = *fmt; |
668 | ++fmt; | |
669 | if (qualifier == 'l' && *fmt == 'l') { | |
670 | qualifier = 'L'; | |
671 | ++fmt; | |
672 | } | |
673 | } | |
674 | ||
675 | /* default base */ | |
676 | base = 10; | |
677 | ||
678 | switch (*fmt) { | |
679 | case 'c': | |
680 | if (!(flags & LEFT)) { | |
681 | while (--field_width > 0) { | |
f796937a | 682 | if (str < end) |
1da177e4 LT |
683 | *str = ' '; |
684 | ++str; | |
685 | } | |
686 | } | |
687 | c = (unsigned char) va_arg(args, int); | |
f796937a | 688 | if (str < end) |
1da177e4 LT |
689 | *str = c; |
690 | ++str; | |
691 | while (--field_width > 0) { | |
f796937a | 692 | if (str < end) |
1da177e4 LT |
693 | *str = ' '; |
694 | ++str; | |
695 | } | |
696 | continue; | |
697 | ||
698 | case 's': | |
0f9bfa56 | 699 | str = string(str, end, va_arg(args, char *), field_width, precision, flags); |
1da177e4 LT |
700 | continue; |
701 | ||
702 | case 'p': | |
4d8a743c LT |
703 | str = pointer(fmt+1, str, end, |
704 | va_arg(args, void *), | |
705 | field_width, precision, flags); | |
706 | /* Skip all alphanumeric pointer suffixes */ | |
707 | while (isalnum(fmt[1])) | |
708 | fmt++; | |
1da177e4 LT |
709 | continue; |
710 | ||
1da177e4 LT |
711 | case 'n': |
712 | /* FIXME: | |
713 | * What does C99 say about the overflow case here? */ | |
714 | if (qualifier == 'l') { | |
715 | long * ip = va_arg(args, long *); | |
716 | *ip = (str - buf); | |
717 | } else if (qualifier == 'Z' || qualifier == 'z') { | |
718 | size_t * ip = va_arg(args, size_t *); | |
719 | *ip = (str - buf); | |
720 | } else { | |
721 | int * ip = va_arg(args, int *); | |
722 | *ip = (str - buf); | |
723 | } | |
724 | continue; | |
725 | ||
726 | case '%': | |
f796937a | 727 | if (str < end) |
1da177e4 LT |
728 | *str = '%'; |
729 | ++str; | |
730 | continue; | |
731 | ||
732 | /* integer number formats - set up the flags and "break" */ | |
733 | case 'o': | |
734 | base = 8; | |
735 | break; | |
736 | ||
1da177e4 | 737 | case 'x': |
9b706aee DV |
738 | flags |= SMALL; |
739 | case 'X': | |
1da177e4 LT |
740 | base = 16; |
741 | break; | |
742 | ||
743 | case 'd': | |
744 | case 'i': | |
745 | flags |= SIGN; | |
746 | case 'u': | |
747 | break; | |
748 | ||
749 | default: | |
f796937a | 750 | if (str < end) |
1da177e4 LT |
751 | *str = '%'; |
752 | ++str; | |
753 | if (*fmt) { | |
f796937a | 754 | if (str < end) |
1da177e4 LT |
755 | *str = *fmt; |
756 | ++str; | |
757 | } else { | |
758 | --fmt; | |
759 | } | |
760 | continue; | |
761 | } | |
762 | if (qualifier == 'L') | |
763 | num = va_arg(args, long long); | |
764 | else if (qualifier == 'l') { | |
765 | num = va_arg(args, unsigned long); | |
766 | if (flags & SIGN) | |
767 | num = (signed long) num; | |
768 | } else if (qualifier == 'Z' || qualifier == 'z') { | |
769 | num = va_arg(args, size_t); | |
80322306 AV |
770 | } else if (qualifier == 't') { |
771 | num = va_arg(args, ptrdiff_t); | |
1da177e4 LT |
772 | } else if (qualifier == 'h') { |
773 | num = (unsigned short) va_arg(args, int); | |
774 | if (flags & SIGN) | |
775 | num = (signed short) num; | |
776 | } else { | |
777 | num = va_arg(args, unsigned int); | |
778 | if (flags & SIGN) | |
779 | num = (signed int) num; | |
780 | } | |
781 | str = number(str, end, num, base, | |
782 | field_width, precision, flags); | |
783 | } | |
f796937a JF |
784 | if (size > 0) { |
785 | if (str < end) | |
786 | *str = '\0'; | |
787 | else | |
0a6047ee | 788 | end[-1] = '\0'; |
f796937a JF |
789 | } |
790 | /* the trailing null byte doesn't count towards the total */ | |
1da177e4 LT |
791 | return str-buf; |
792 | } | |
793 | ||
794 | EXPORT_SYMBOL(vsnprintf); | |
795 | ||
796 | /** | |
797 | * vscnprintf - Format a string and place it in a buffer | |
798 | * @buf: The buffer to place the result into | |
799 | * @size: The size of the buffer, including the trailing null space | |
800 | * @fmt: The format string to use | |
801 | * @args: Arguments for the format string | |
802 | * | |
803 | * The return value is the number of characters which have been written into | |
804 | * the @buf not including the trailing '\0'. If @size is <= 0 the function | |
805 | * returns 0. | |
806 | * | |
807 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 808 | * You probably want scnprintf() instead. |
1da177e4 LT |
809 | */ |
810 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
811 | { | |
812 | int i; | |
813 | ||
814 | i=vsnprintf(buf,size,fmt,args); | |
815 | return (i >= size) ? (size - 1) : i; | |
816 | } | |
817 | ||
818 | EXPORT_SYMBOL(vscnprintf); | |
819 | ||
820 | /** | |
821 | * snprintf - Format a string and place it in a buffer | |
822 | * @buf: The buffer to place the result into | |
823 | * @size: The size of the buffer, including the trailing null space | |
824 | * @fmt: The format string to use | |
825 | * @...: Arguments for the format string | |
826 | * | |
827 | * The return value is the number of characters which would be | |
828 | * generated for the given input, excluding the trailing null, | |
829 | * as per ISO C99. If the return is greater than or equal to | |
830 | * @size, the resulting string is truncated. | |
831 | */ | |
832 | int snprintf(char * buf, size_t size, const char *fmt, ...) | |
833 | { | |
834 | va_list args; | |
835 | int i; | |
836 | ||
837 | va_start(args, fmt); | |
838 | i=vsnprintf(buf,size,fmt,args); | |
839 | va_end(args); | |
840 | return i; | |
841 | } | |
842 | ||
843 | EXPORT_SYMBOL(snprintf); | |
844 | ||
845 | /** | |
846 | * scnprintf - Format a string and place it in a buffer | |
847 | * @buf: The buffer to place the result into | |
848 | * @size: The size of the buffer, including the trailing null space | |
849 | * @fmt: The format string to use | |
850 | * @...: Arguments for the format string | |
851 | * | |
852 | * The return value is the number of characters written into @buf not including | |
ea6f3281 | 853 | * the trailing '\0'. If @size is <= 0 the function returns 0. |
1da177e4 LT |
854 | */ |
855 | ||
856 | int scnprintf(char * buf, size_t size, const char *fmt, ...) | |
857 | { | |
858 | va_list args; | |
859 | int i; | |
860 | ||
861 | va_start(args, fmt); | |
862 | i = vsnprintf(buf, size, fmt, args); | |
863 | va_end(args); | |
864 | return (i >= size) ? (size - 1) : i; | |
865 | } | |
866 | EXPORT_SYMBOL(scnprintf); | |
867 | ||
868 | /** | |
869 | * vsprintf - Format a string and place it in a buffer | |
870 | * @buf: The buffer to place the result into | |
871 | * @fmt: The format string to use | |
872 | * @args: Arguments for the format string | |
873 | * | |
874 | * The function returns the number of characters written | |
72fd4a35 | 875 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
876 | * buffer overflows. |
877 | * | |
878 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 879 | * You probably want sprintf() instead. |
1da177e4 LT |
880 | */ |
881 | int vsprintf(char *buf, const char *fmt, va_list args) | |
882 | { | |
883 | return vsnprintf(buf, INT_MAX, fmt, args); | |
884 | } | |
885 | ||
886 | EXPORT_SYMBOL(vsprintf); | |
887 | ||
888 | /** | |
889 | * sprintf - Format a string and place it in a buffer | |
890 | * @buf: The buffer to place the result into | |
891 | * @fmt: The format string to use | |
892 | * @...: Arguments for the format string | |
893 | * | |
894 | * The function returns the number of characters written | |
72fd4a35 | 895 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 LT |
896 | * buffer overflows. |
897 | */ | |
898 | int sprintf(char * buf, const char *fmt, ...) | |
899 | { | |
900 | va_list args; | |
901 | int i; | |
902 | ||
903 | va_start(args, fmt); | |
904 | i=vsnprintf(buf, INT_MAX, fmt, args); | |
905 | va_end(args); | |
906 | return i; | |
907 | } | |
908 | ||
909 | EXPORT_SYMBOL(sprintf); | |
910 | ||
911 | /** | |
912 | * vsscanf - Unformat a buffer into a list of arguments | |
913 | * @buf: input buffer | |
914 | * @fmt: format of buffer | |
915 | * @args: arguments | |
916 | */ | |
917 | int vsscanf(const char * buf, const char * fmt, va_list args) | |
918 | { | |
919 | const char *str = buf; | |
920 | char *next; | |
921 | char digit; | |
922 | int num = 0; | |
923 | int qualifier; | |
924 | int base; | |
925 | int field_width; | |
926 | int is_sign = 0; | |
927 | ||
928 | while(*fmt && *str) { | |
929 | /* skip any white space in format */ | |
930 | /* white space in format matchs any amount of | |
931 | * white space, including none, in the input. | |
932 | */ | |
933 | if (isspace(*fmt)) { | |
934 | while (isspace(*fmt)) | |
935 | ++fmt; | |
936 | while (isspace(*str)) | |
937 | ++str; | |
938 | } | |
939 | ||
940 | /* anything that is not a conversion must match exactly */ | |
941 | if (*fmt != '%' && *fmt) { | |
942 | if (*fmt++ != *str++) | |
943 | break; | |
944 | continue; | |
945 | } | |
946 | ||
947 | if (!*fmt) | |
948 | break; | |
949 | ++fmt; | |
950 | ||
951 | /* skip this conversion. | |
952 | * advance both strings to next white space | |
953 | */ | |
954 | if (*fmt == '*') { | |
955 | while (!isspace(*fmt) && *fmt) | |
956 | fmt++; | |
957 | while (!isspace(*str) && *str) | |
958 | str++; | |
959 | continue; | |
960 | } | |
961 | ||
962 | /* get field width */ | |
963 | field_width = -1; | |
964 | if (isdigit(*fmt)) | |
965 | field_width = skip_atoi(&fmt); | |
966 | ||
967 | /* get conversion qualifier */ | |
968 | qualifier = -1; | |
969 | if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || | |
970 | *fmt == 'Z' || *fmt == 'z') { | |
971 | qualifier = *fmt++; | |
972 | if (unlikely(qualifier == *fmt)) { | |
973 | if (qualifier == 'h') { | |
974 | qualifier = 'H'; | |
975 | fmt++; | |
976 | } else if (qualifier == 'l') { | |
977 | qualifier = 'L'; | |
978 | fmt++; | |
979 | } | |
980 | } | |
981 | } | |
982 | base = 10; | |
983 | is_sign = 0; | |
984 | ||
985 | if (!*fmt || !*str) | |
986 | break; | |
987 | ||
988 | switch(*fmt++) { | |
989 | case 'c': | |
990 | { | |
991 | char *s = (char *) va_arg(args,char*); | |
992 | if (field_width == -1) | |
993 | field_width = 1; | |
994 | do { | |
995 | *s++ = *str++; | |
996 | } while (--field_width > 0 && *str); | |
997 | num++; | |
998 | } | |
999 | continue; | |
1000 | case 's': | |
1001 | { | |
1002 | char *s = (char *) va_arg(args, char *); | |
1003 | if(field_width == -1) | |
1004 | field_width = INT_MAX; | |
1005 | /* first, skip leading white space in buffer */ | |
1006 | while (isspace(*str)) | |
1007 | str++; | |
1008 | ||
1009 | /* now copy until next white space */ | |
1010 | while (*str && !isspace(*str) && field_width--) { | |
1011 | *s++ = *str++; | |
1012 | } | |
1013 | *s = '\0'; | |
1014 | num++; | |
1015 | } | |
1016 | continue; | |
1017 | case 'n': | |
1018 | /* return number of characters read so far */ | |
1019 | { | |
1020 | int *i = (int *)va_arg(args,int*); | |
1021 | *i = str - buf; | |
1022 | } | |
1023 | continue; | |
1024 | case 'o': | |
1025 | base = 8; | |
1026 | break; | |
1027 | case 'x': | |
1028 | case 'X': | |
1029 | base = 16; | |
1030 | break; | |
1031 | case 'i': | |
1032 | base = 0; | |
1033 | case 'd': | |
1034 | is_sign = 1; | |
1035 | case 'u': | |
1036 | break; | |
1037 | case '%': | |
1038 | /* looking for '%' in str */ | |
1039 | if (*str++ != '%') | |
1040 | return num; | |
1041 | continue; | |
1042 | default: | |
1043 | /* invalid format; stop here */ | |
1044 | return num; | |
1045 | } | |
1046 | ||
1047 | /* have some sort of integer conversion. | |
1048 | * first, skip white space in buffer. | |
1049 | */ | |
1050 | while (isspace(*str)) | |
1051 | str++; | |
1052 | ||
1053 | digit = *str; | |
1054 | if (is_sign && digit == '-') | |
1055 | digit = *(str + 1); | |
1056 | ||
1057 | if (!digit | |
1058 | || (base == 16 && !isxdigit(digit)) | |
1059 | || (base == 10 && !isdigit(digit)) | |
1060 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
1061 | || (base == 0 && !isdigit(digit))) | |
1062 | break; | |
1063 | ||
1064 | switch(qualifier) { | |
1065 | case 'H': /* that's 'hh' in format */ | |
1066 | if (is_sign) { | |
1067 | signed char *s = (signed char *) va_arg(args,signed char *); | |
1068 | *s = (signed char) simple_strtol(str,&next,base); | |
1069 | } else { | |
1070 | unsigned char *s = (unsigned char *) va_arg(args, unsigned char *); | |
1071 | *s = (unsigned char) simple_strtoul(str, &next, base); | |
1072 | } | |
1073 | break; | |
1074 | case 'h': | |
1075 | if (is_sign) { | |
1076 | short *s = (short *) va_arg(args,short *); | |
1077 | *s = (short) simple_strtol(str,&next,base); | |
1078 | } else { | |
1079 | unsigned short *s = (unsigned short *) va_arg(args, unsigned short *); | |
1080 | *s = (unsigned short) simple_strtoul(str, &next, base); | |
1081 | } | |
1082 | break; | |
1083 | case 'l': | |
1084 | if (is_sign) { | |
1085 | long *l = (long *) va_arg(args,long *); | |
1086 | *l = simple_strtol(str,&next,base); | |
1087 | } else { | |
1088 | unsigned long *l = (unsigned long*) va_arg(args,unsigned long*); | |
1089 | *l = simple_strtoul(str,&next,base); | |
1090 | } | |
1091 | break; | |
1092 | case 'L': | |
1093 | if (is_sign) { | |
1094 | long long *l = (long long*) va_arg(args,long long *); | |
1095 | *l = simple_strtoll(str,&next,base); | |
1096 | } else { | |
1097 | unsigned long long *l = (unsigned long long*) va_arg(args,unsigned long long*); | |
1098 | *l = simple_strtoull(str,&next,base); | |
1099 | } | |
1100 | break; | |
1101 | case 'Z': | |
1102 | case 'z': | |
1103 | { | |
1104 | size_t *s = (size_t*) va_arg(args,size_t*); | |
1105 | *s = (size_t) simple_strtoul(str,&next,base); | |
1106 | } | |
1107 | break; | |
1108 | default: | |
1109 | if (is_sign) { | |
1110 | int *i = (int *) va_arg(args, int*); | |
1111 | *i = (int) simple_strtol(str,&next,base); | |
1112 | } else { | |
1113 | unsigned int *i = (unsigned int*) va_arg(args, unsigned int*); | |
1114 | *i = (unsigned int) simple_strtoul(str,&next,base); | |
1115 | } | |
1116 | break; | |
1117 | } | |
1118 | num++; | |
1119 | ||
1120 | if (!next) | |
1121 | break; | |
1122 | str = next; | |
1123 | } | |
c6b40d16 JB |
1124 | |
1125 | /* | |
1126 | * Now we've come all the way through so either the input string or the | |
1127 | * format ended. In the former case, there can be a %n at the current | |
1128 | * position in the format that needs to be filled. | |
1129 | */ | |
1130 | if (*fmt == '%' && *(fmt + 1) == 'n') { | |
1131 | int *p = (int *)va_arg(args, int *); | |
1132 | *p = str - buf; | |
1133 | } | |
1134 | ||
1da177e4 LT |
1135 | return num; |
1136 | } | |
1137 | ||
1138 | EXPORT_SYMBOL(vsscanf); | |
1139 | ||
1140 | /** | |
1141 | * sscanf - Unformat a buffer into a list of arguments | |
1142 | * @buf: input buffer | |
1143 | * @fmt: formatting of buffer | |
1144 | * @...: resulting arguments | |
1145 | */ | |
1146 | int sscanf(const char * buf, const char * fmt, ...) | |
1147 | { | |
1148 | va_list args; | |
1149 | int i; | |
1150 | ||
1151 | va_start(args,fmt); | |
1152 | i = vsscanf(buf,fmt,args); | |
1153 | va_end(args); | |
1154 | return i; | |
1155 | } | |
1156 | ||
1157 | EXPORT_SYMBOL(sscanf); |