Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/lib/vsprintf.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | */ | |
6 | ||
7 | /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */ | |
8 | /* | |
9 | * Wirzenius wrote this portably, Torvalds fucked it up :-) | |
10 | */ | |
11 | ||
7b9186f5 | 12 | /* |
1da177e4 LT |
13 | * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com> |
14 | * - changed to provide snprintf and vsnprintf functions | |
15 | * So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de> | |
16 | * - scnprintf and vscnprintf | |
17 | */ | |
18 | ||
19 | #include <stdarg.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/types.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/ctype.h> | |
24 | #include <linux/kernel.h> | |
0fe1ef24 LT |
25 | #include <linux/kallsyms.h> |
26 | #include <linux/uaccess.h> | |
332d2e78 | 27 | #include <linux/ioport.h> |
8a27f7c9 | 28 | #include <net/addrconf.h> |
1da177e4 | 29 | |
4e57b681 | 30 | #include <asm/page.h> /* for PAGE_SIZE */ |
1da177e4 | 31 | #include <asm/div64.h> |
deac93df | 32 | #include <asm/sections.h> /* for dereference_function_descriptor() */ |
1da177e4 | 33 | |
9b706aee DV |
34 | /* Works only for digits and letters, but small and fast */ |
35 | #define TOLOWER(x) ((x) | 0x20) | |
36 | ||
aa46a63e HH |
37 | static unsigned int simple_guess_base(const char *cp) |
38 | { | |
39 | if (cp[0] == '0') { | |
40 | if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2])) | |
41 | return 16; | |
42 | else | |
43 | return 8; | |
44 | } else { | |
45 | return 10; | |
46 | } | |
47 | } | |
48 | ||
1da177e4 LT |
49 | /** |
50 | * simple_strtoul - convert a string to an unsigned long | |
51 | * @cp: The start of the string | |
52 | * @endp: A pointer to the end of the parsed string will be placed here | |
53 | * @base: The number base to use | |
54 | */ | |
22d27051 | 55 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
1da177e4 | 56 | { |
aa46a63e HH |
57 | unsigned long result = 0; |
58 | ||
59 | if (!base) | |
60 | base = simple_guess_base(cp); | |
61 | ||
62 | if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x') | |
63 | cp += 2; | |
64 | ||
65 | while (isxdigit(*cp)) { | |
66 | unsigned int value; | |
67 | ||
68 | value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10; | |
69 | if (value >= base) | |
70 | break; | |
71 | result = result * base + value; | |
1da177e4 LT |
72 | cp++; |
73 | } | |
74 | if (endp) | |
75 | *endp = (char *)cp; | |
7b9186f5 | 76 | |
1da177e4 LT |
77 | return result; |
78 | } | |
1da177e4 LT |
79 | EXPORT_SYMBOL(simple_strtoul); |
80 | ||
81 | /** | |
82 | * simple_strtol - convert a string to a signed long | |
83 | * @cp: The start of the string | |
84 | * @endp: A pointer to the end of the parsed string will be placed here | |
85 | * @base: The number base to use | |
86 | */ | |
22d27051 | 87 | long simple_strtol(const char *cp, char **endp, unsigned int base) |
1da177e4 | 88 | { |
7b9186f5 | 89 | if (*cp == '-') |
22d27051 | 90 | return -simple_strtoul(cp + 1, endp, base); |
7b9186f5 | 91 | |
22d27051 | 92 | return simple_strtoul(cp, endp, base); |
1da177e4 | 93 | } |
1da177e4 LT |
94 | EXPORT_SYMBOL(simple_strtol); |
95 | ||
96 | /** | |
97 | * simple_strtoull - convert a string to an unsigned long long | |
98 | * @cp: The start of the string | |
99 | * @endp: A pointer to the end of the parsed string will be placed here | |
100 | * @base: The number base to use | |
101 | */ | |
22d27051 | 102 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
1da177e4 | 103 | { |
aa46a63e HH |
104 | unsigned long long result = 0; |
105 | ||
106 | if (!base) | |
107 | base = simple_guess_base(cp); | |
108 | ||
109 | if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x') | |
110 | cp += 2; | |
111 | ||
112 | while (isxdigit(*cp)) { | |
113 | unsigned int value; | |
114 | ||
115 | value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10; | |
116 | if (value >= base) | |
117 | break; | |
118 | result = result * base + value; | |
1da177e4 LT |
119 | cp++; |
120 | } | |
121 | if (endp) | |
122 | *endp = (char *)cp; | |
7b9186f5 | 123 | |
1da177e4 LT |
124 | return result; |
125 | } | |
1da177e4 LT |
126 | EXPORT_SYMBOL(simple_strtoull); |
127 | ||
128 | /** | |
129 | * simple_strtoll - convert a string to a signed long long | |
130 | * @cp: The start of the string | |
131 | * @endp: A pointer to the end of the parsed string will be placed here | |
132 | * @base: The number base to use | |
133 | */ | |
22d27051 | 134 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
1da177e4 | 135 | { |
7b9186f5 | 136 | if (*cp == '-') |
22d27051 | 137 | return -simple_strtoull(cp + 1, endp, base); |
7b9186f5 | 138 | |
22d27051 | 139 | return simple_strtoull(cp, endp, base); |
1da177e4 LT |
140 | } |
141 | ||
06b2a76d YY |
142 | /** |
143 | * strict_strtoul - convert a string to an unsigned long strictly | |
144 | * @cp: The string to be converted | |
145 | * @base: The number base to use | |
146 | * @res: The converted result value | |
147 | * | |
148 | * strict_strtoul converts a string to an unsigned long only if the | |
149 | * string is really an unsigned long string, any string containing | |
150 | * any invalid char at the tail will be rejected and -EINVAL is returned, | |
151 | * only a newline char at the tail is acceptible because people generally | |
152 | * change a module parameter in the following way: | |
153 | * | |
154 | * echo 1024 > /sys/module/e1000/parameters/copybreak | |
155 | * | |
156 | * echo will append a newline to the tail. | |
157 | * | |
158 | * It returns 0 if conversion is successful and *res is set to the converted | |
159 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
160 | * | |
161 | * simple_strtoul just ignores the successive invalid characters and | |
162 | * return the converted value of prefix part of the string. | |
163 | */ | |
9d85db22 HH |
164 | int strict_strtoul(const char *cp, unsigned int base, unsigned long *res) |
165 | { | |
166 | char *tail; | |
167 | unsigned long val; | |
168 | size_t len; | |
169 | ||
170 | *res = 0; | |
171 | len = strlen(cp); | |
172 | if (len == 0) | |
173 | return -EINVAL; | |
174 | ||
175 | val = simple_strtoul(cp, &tail, base); | |
e899aa82 PM |
176 | if (tail == cp) |
177 | return -EINVAL; | |
7b9186f5 | 178 | |
9d85db22 HH |
179 | if ((*tail == '\0') || |
180 | ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) { | |
181 | *res = val; | |
182 | return 0; | |
183 | } | |
184 | ||
185 | return -EINVAL; | |
186 | } | |
187 | EXPORT_SYMBOL(strict_strtoul); | |
06b2a76d YY |
188 | |
189 | /** | |
190 | * strict_strtol - convert a string to a long strictly | |
191 | * @cp: The string to be converted | |
192 | * @base: The number base to use | |
193 | * @res: The converted result value | |
194 | * | |
195 | * strict_strtol is similiar to strict_strtoul, but it allows the first | |
196 | * character of a string is '-'. | |
197 | * | |
198 | * It returns 0 if conversion is successful and *res is set to the converted | |
199 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
200 | */ | |
9d85db22 HH |
201 | int strict_strtol(const char *cp, unsigned int base, long *res) |
202 | { | |
203 | int ret; | |
204 | if (*cp == '-') { | |
205 | ret = strict_strtoul(cp + 1, base, (unsigned long *)res); | |
206 | if (!ret) | |
207 | *res = -(*res); | |
208 | } else { | |
209 | ret = strict_strtoul(cp, base, (unsigned long *)res); | |
210 | } | |
211 | ||
212 | return ret; | |
213 | } | |
214 | EXPORT_SYMBOL(strict_strtol); | |
06b2a76d YY |
215 | |
216 | /** | |
217 | * strict_strtoull - convert a string to an unsigned long long strictly | |
218 | * @cp: The string to be converted | |
219 | * @base: The number base to use | |
220 | * @res: The converted result value | |
221 | * | |
222 | * strict_strtoull converts a string to an unsigned long long only if the | |
223 | * string is really an unsigned long long string, any string containing | |
224 | * any invalid char at the tail will be rejected and -EINVAL is returned, | |
225 | * only a newline char at the tail is acceptible because people generally | |
226 | * change a module parameter in the following way: | |
227 | * | |
228 | * echo 1024 > /sys/module/e1000/parameters/copybreak | |
229 | * | |
230 | * echo will append a newline to the tail of the string. | |
231 | * | |
232 | * It returns 0 if conversion is successful and *res is set to the converted | |
233 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
234 | * | |
235 | * simple_strtoull just ignores the successive invalid characters and | |
236 | * return the converted value of prefix part of the string. | |
237 | */ | |
9d85db22 HH |
238 | int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res) |
239 | { | |
240 | char *tail; | |
241 | unsigned long long val; | |
242 | size_t len; | |
243 | ||
244 | *res = 0; | |
245 | len = strlen(cp); | |
246 | if (len == 0) | |
247 | return -EINVAL; | |
248 | ||
249 | val = simple_strtoull(cp, &tail, base); | |
e899aa82 PM |
250 | if (tail == cp) |
251 | return -EINVAL; | |
9d85db22 HH |
252 | if ((*tail == '\0') || |
253 | ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) { | |
254 | *res = val; | |
255 | return 0; | |
256 | } | |
257 | ||
258 | return -EINVAL; | |
259 | } | |
260 | EXPORT_SYMBOL(strict_strtoull); | |
06b2a76d YY |
261 | |
262 | /** | |
263 | * strict_strtoll - convert a string to a long long strictly | |
264 | * @cp: The string to be converted | |
265 | * @base: The number base to use | |
266 | * @res: The converted result value | |
267 | * | |
268 | * strict_strtoll is similiar to strict_strtoull, but it allows the first | |
269 | * character of a string is '-'. | |
270 | * | |
271 | * It returns 0 if conversion is successful and *res is set to the converted | |
272 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
273 | */ | |
9d85db22 HH |
274 | int strict_strtoll(const char *cp, unsigned int base, long long *res) |
275 | { | |
276 | int ret; | |
277 | if (*cp == '-') { | |
278 | ret = strict_strtoull(cp + 1, base, (unsigned long long *)res); | |
279 | if (!ret) | |
280 | *res = -(*res); | |
281 | } else { | |
282 | ret = strict_strtoull(cp, base, (unsigned long long *)res); | |
283 | } | |
06b2a76d | 284 | |
9d85db22 HH |
285 | return ret; |
286 | } | |
06b2a76d | 287 | EXPORT_SYMBOL(strict_strtoll); |
06b2a76d | 288 | |
1da177e4 LT |
289 | static int skip_atoi(const char **s) |
290 | { | |
7b9186f5 | 291 | int i = 0; |
1da177e4 LT |
292 | |
293 | while (isdigit(**s)) | |
294 | i = i*10 + *((*s)++) - '0'; | |
7b9186f5 | 295 | |
1da177e4 LT |
296 | return i; |
297 | } | |
298 | ||
4277eedd DV |
299 | /* Decimal conversion is by far the most typical, and is used |
300 | * for /proc and /sys data. This directly impacts e.g. top performance | |
301 | * with many processes running. We optimize it for speed | |
302 | * using code from | |
303 | * http://www.cs.uiowa.edu/~jones/bcd/decimal.html | |
304 | * (with permission from the author, Douglas W. Jones). */ | |
305 | ||
306 | /* Formats correctly any integer in [0,99999]. | |
307 | * Outputs from one to five digits depending on input. | |
308 | * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */ | |
7b9186f5 | 309 | static char *put_dec_trunc(char *buf, unsigned q) |
4277eedd DV |
310 | { |
311 | unsigned d3, d2, d1, d0; | |
312 | d1 = (q>>4) & 0xf; | |
313 | d2 = (q>>8) & 0xf; | |
314 | d3 = (q>>12); | |
315 | ||
316 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); | |
317 | q = (d0 * 0xcd) >> 11; | |
318 | d0 = d0 - 10*q; | |
319 | *buf++ = d0 + '0'; /* least significant digit */ | |
320 | d1 = q + 9*d3 + 5*d2 + d1; | |
321 | if (d1 != 0) { | |
322 | q = (d1 * 0xcd) >> 11; | |
323 | d1 = d1 - 10*q; | |
324 | *buf++ = d1 + '0'; /* next digit */ | |
325 | ||
326 | d2 = q + 2*d2; | |
327 | if ((d2 != 0) || (d3 != 0)) { | |
328 | q = (d2 * 0xd) >> 7; | |
329 | d2 = d2 - 10*q; | |
330 | *buf++ = d2 + '0'; /* next digit */ | |
331 | ||
332 | d3 = q + 4*d3; | |
333 | if (d3 != 0) { | |
334 | q = (d3 * 0xcd) >> 11; | |
335 | d3 = d3 - 10*q; | |
336 | *buf++ = d3 + '0'; /* next digit */ | |
337 | if (q != 0) | |
7b9186f5 | 338 | *buf++ = q + '0'; /* most sign. digit */ |
4277eedd DV |
339 | } |
340 | } | |
341 | } | |
7b9186f5 | 342 | |
4277eedd DV |
343 | return buf; |
344 | } | |
345 | /* Same with if's removed. Always emits five digits */ | |
7b9186f5 | 346 | static char *put_dec_full(char *buf, unsigned q) |
4277eedd DV |
347 | { |
348 | /* BTW, if q is in [0,9999], 8-bit ints will be enough, */ | |
349 | /* but anyway, gcc produces better code with full-sized ints */ | |
350 | unsigned d3, d2, d1, d0; | |
351 | d1 = (q>>4) & 0xf; | |
352 | d2 = (q>>8) & 0xf; | |
353 | d3 = (q>>12); | |
354 | ||
7b9186f5 AGR |
355 | /* |
356 | * Possible ways to approx. divide by 10 | |
357 | * gcc -O2 replaces multiply with shifts and adds | |
358 | * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386) | |
359 | * (x * 0x67) >> 10: 1100111 | |
360 | * (x * 0x34) >> 9: 110100 - same | |
361 | * (x * 0x1a) >> 8: 11010 - same | |
362 | * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386) | |
363 | */ | |
4277eedd DV |
364 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); |
365 | q = (d0 * 0xcd) >> 11; | |
366 | d0 = d0 - 10*q; | |
367 | *buf++ = d0 + '0'; | |
368 | d1 = q + 9*d3 + 5*d2 + d1; | |
369 | q = (d1 * 0xcd) >> 11; | |
370 | d1 = d1 - 10*q; | |
371 | *buf++ = d1 + '0'; | |
372 | ||
373 | d2 = q + 2*d2; | |
374 | q = (d2 * 0xd) >> 7; | |
375 | d2 = d2 - 10*q; | |
376 | *buf++ = d2 + '0'; | |
377 | ||
378 | d3 = q + 4*d3; | |
379 | q = (d3 * 0xcd) >> 11; /* - shorter code */ | |
380 | /* q = (d3 * 0x67) >> 10; - would also work */ | |
381 | d3 = d3 - 10*q; | |
382 | *buf++ = d3 + '0'; | |
383 | *buf++ = q + '0'; | |
7b9186f5 | 384 | |
4277eedd DV |
385 | return buf; |
386 | } | |
387 | /* No inlining helps gcc to use registers better */ | |
7b9186f5 | 388 | static noinline char *put_dec(char *buf, unsigned long long num) |
4277eedd DV |
389 | { |
390 | while (1) { | |
391 | unsigned rem; | |
392 | if (num < 100000) | |
393 | return put_dec_trunc(buf, num); | |
394 | rem = do_div(num, 100000); | |
395 | buf = put_dec_full(buf, rem); | |
396 | } | |
397 | } | |
398 | ||
1da177e4 LT |
399 | #define ZEROPAD 1 /* pad with zero */ |
400 | #define SIGN 2 /* unsigned/signed long */ | |
401 | #define PLUS 4 /* show plus */ | |
402 | #define SPACE 8 /* space if plus */ | |
403 | #define LEFT 16 /* left justified */ | |
9b706aee DV |
404 | #define SMALL 32 /* Must be 32 == 0x20 */ |
405 | #define SPECIAL 64 /* 0x */ | |
1da177e4 | 406 | |
fef20d9c FW |
407 | enum format_type { |
408 | FORMAT_TYPE_NONE, /* Just a string part */ | |
ed681a91 | 409 | FORMAT_TYPE_WIDTH, |
fef20d9c FW |
410 | FORMAT_TYPE_PRECISION, |
411 | FORMAT_TYPE_CHAR, | |
412 | FORMAT_TYPE_STR, | |
413 | FORMAT_TYPE_PTR, | |
414 | FORMAT_TYPE_PERCENT_CHAR, | |
415 | FORMAT_TYPE_INVALID, | |
416 | FORMAT_TYPE_LONG_LONG, | |
417 | FORMAT_TYPE_ULONG, | |
418 | FORMAT_TYPE_LONG, | |
a4e94ef0 Z |
419 | FORMAT_TYPE_UBYTE, |
420 | FORMAT_TYPE_BYTE, | |
fef20d9c FW |
421 | FORMAT_TYPE_USHORT, |
422 | FORMAT_TYPE_SHORT, | |
423 | FORMAT_TYPE_UINT, | |
424 | FORMAT_TYPE_INT, | |
425 | FORMAT_TYPE_NRCHARS, | |
426 | FORMAT_TYPE_SIZE_T, | |
427 | FORMAT_TYPE_PTRDIFF | |
428 | }; | |
429 | ||
430 | struct printf_spec { | |
431 | enum format_type type; | |
432 | int flags; /* flags to number() */ | |
433 | int field_width; /* width of output field */ | |
434 | int base; | |
435 | int precision; /* # of digits/chars */ | |
436 | int qualifier; | |
437 | }; | |
438 | ||
439 | static char *number(char *buf, char *end, unsigned long long num, | |
440 | struct printf_spec spec) | |
1da177e4 | 441 | { |
9b706aee DV |
442 | /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ |
443 | static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ | |
444 | ||
445 | char tmp[66]; | |
446 | char sign; | |
447 | char locase; | |
fef20d9c | 448 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
1da177e4 LT |
449 | int i; |
450 | ||
9b706aee DV |
451 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
452 | * produces same digits or (maybe lowercased) letters */ | |
fef20d9c FW |
453 | locase = (spec.flags & SMALL); |
454 | if (spec.flags & LEFT) | |
455 | spec.flags &= ~ZEROPAD; | |
1da177e4 | 456 | sign = 0; |
fef20d9c | 457 | if (spec.flags & SIGN) { |
7b9186f5 | 458 | if ((signed long long)num < 0) { |
1da177e4 | 459 | sign = '-'; |
7b9186f5 | 460 | num = -(signed long long)num; |
fef20d9c FW |
461 | spec.field_width--; |
462 | } else if (spec.flags & PLUS) { | |
1da177e4 | 463 | sign = '+'; |
fef20d9c FW |
464 | spec.field_width--; |
465 | } else if (spec.flags & SPACE) { | |
1da177e4 | 466 | sign = ' '; |
fef20d9c | 467 | spec.field_width--; |
1da177e4 LT |
468 | } |
469 | } | |
b39a7340 | 470 | if (need_pfx) { |
fef20d9c FW |
471 | spec.field_width--; |
472 | if (spec.base == 16) | |
473 | spec.field_width--; | |
1da177e4 | 474 | } |
b39a7340 DV |
475 | |
476 | /* generate full string in tmp[], in reverse order */ | |
1da177e4 LT |
477 | i = 0; |
478 | if (num == 0) | |
b39a7340 | 479 | tmp[i++] = '0'; |
4277eedd DV |
480 | /* Generic code, for any base: |
481 | else do { | |
9b706aee | 482 | tmp[i++] = (digits[do_div(num,base)] | locase); |
4277eedd DV |
483 | } while (num != 0); |
484 | */ | |
fef20d9c FW |
485 | else if (spec.base != 10) { /* 8 or 16 */ |
486 | int mask = spec.base - 1; | |
b39a7340 | 487 | int shift = 3; |
7b9186f5 AGR |
488 | |
489 | if (spec.base == 16) | |
490 | shift = 4; | |
b39a7340 | 491 | do { |
9b706aee | 492 | tmp[i++] = (digits[((unsigned char)num) & mask] | locase); |
b39a7340 DV |
493 | num >>= shift; |
494 | } while (num); | |
4277eedd DV |
495 | } else { /* base 10 */ |
496 | i = put_dec(tmp, num) - tmp; | |
497 | } | |
b39a7340 DV |
498 | |
499 | /* printing 100 using %2d gives "100", not "00" */ | |
fef20d9c FW |
500 | if (i > spec.precision) |
501 | spec.precision = i; | |
b39a7340 | 502 | /* leading space padding */ |
fef20d9c FW |
503 | spec.field_width -= spec.precision; |
504 | if (!(spec.flags & (ZEROPAD+LEFT))) { | |
7b9186f5 | 505 | while (--spec.field_width >= 0) { |
f796937a | 506 | if (buf < end) |
1da177e4 LT |
507 | *buf = ' '; |
508 | ++buf; | |
509 | } | |
510 | } | |
b39a7340 | 511 | /* sign */ |
1da177e4 | 512 | if (sign) { |
f796937a | 513 | if (buf < end) |
1da177e4 LT |
514 | *buf = sign; |
515 | ++buf; | |
516 | } | |
b39a7340 DV |
517 | /* "0x" / "0" prefix */ |
518 | if (need_pfx) { | |
519 | if (buf < end) | |
520 | *buf = '0'; | |
521 | ++buf; | |
fef20d9c | 522 | if (spec.base == 16) { |
f796937a | 523 | if (buf < end) |
9b706aee | 524 | *buf = ('X' | locase); |
1da177e4 LT |
525 | ++buf; |
526 | } | |
527 | } | |
b39a7340 | 528 | /* zero or space padding */ |
fef20d9c FW |
529 | if (!(spec.flags & LEFT)) { |
530 | char c = (spec.flags & ZEROPAD) ? '0' : ' '; | |
531 | while (--spec.field_width >= 0) { | |
f796937a | 532 | if (buf < end) |
1da177e4 LT |
533 | *buf = c; |
534 | ++buf; | |
535 | } | |
536 | } | |
b39a7340 | 537 | /* hmm even more zero padding? */ |
fef20d9c | 538 | while (i <= --spec.precision) { |
f796937a | 539 | if (buf < end) |
1da177e4 LT |
540 | *buf = '0'; |
541 | ++buf; | |
542 | } | |
b39a7340 DV |
543 | /* actual digits of result */ |
544 | while (--i >= 0) { | |
f796937a | 545 | if (buf < end) |
1da177e4 LT |
546 | *buf = tmp[i]; |
547 | ++buf; | |
548 | } | |
b39a7340 | 549 | /* trailing space padding */ |
fef20d9c | 550 | while (--spec.field_width >= 0) { |
f796937a | 551 | if (buf < end) |
1da177e4 LT |
552 | *buf = ' '; |
553 | ++buf; | |
554 | } | |
7b9186f5 | 555 | |
1da177e4 LT |
556 | return buf; |
557 | } | |
558 | ||
0f4f81dc | 559 | static char *string(char *buf, char *end, const char *s, struct printf_spec spec) |
0f9bfa56 LT |
560 | { |
561 | int len, i; | |
562 | ||
563 | if ((unsigned long)s < PAGE_SIZE) | |
0f4f81dc | 564 | s = "(null)"; |
0f9bfa56 | 565 | |
fef20d9c | 566 | len = strnlen(s, spec.precision); |
0f9bfa56 | 567 | |
fef20d9c FW |
568 | if (!(spec.flags & LEFT)) { |
569 | while (len < spec.field_width--) { | |
0f9bfa56 LT |
570 | if (buf < end) |
571 | *buf = ' '; | |
572 | ++buf; | |
573 | } | |
574 | } | |
575 | for (i = 0; i < len; ++i) { | |
576 | if (buf < end) | |
577 | *buf = *s; | |
578 | ++buf; ++s; | |
579 | } | |
fef20d9c | 580 | while (len < spec.field_width--) { |
0f9bfa56 LT |
581 | if (buf < end) |
582 | *buf = ' '; | |
583 | ++buf; | |
584 | } | |
7b9186f5 | 585 | |
0f9bfa56 LT |
586 | return buf; |
587 | } | |
588 | ||
fef20d9c | 589 | static char *symbol_string(char *buf, char *end, void *ptr, |
0c8b946e | 590 | struct printf_spec spec, char ext) |
0fe1ef24 LT |
591 | { |
592 | unsigned long value = (unsigned long) ptr; | |
593 | #ifdef CONFIG_KALLSYMS | |
594 | char sym[KSYM_SYMBOL_LEN]; | |
91adcd2c | 595 | if (ext != 'f' && ext != 's') |
0c8b946e FW |
596 | sprint_symbol(sym, value); |
597 | else | |
598 | kallsyms_lookup(value, NULL, NULL, NULL, sym); | |
7b9186f5 | 599 | |
fef20d9c | 600 | return string(buf, end, sym, spec); |
0fe1ef24 | 601 | #else |
7b9186f5 | 602 | spec.field_width = 2 * sizeof(void *); |
fef20d9c FW |
603 | spec.flags |= SPECIAL | SMALL | ZEROPAD; |
604 | spec.base = 16; | |
7b9186f5 | 605 | |
fef20d9c | 606 | return number(buf, end, value, spec); |
0fe1ef24 LT |
607 | #endif |
608 | } | |
609 | ||
fef20d9c | 610 | static char *resource_string(char *buf, char *end, struct resource *res, |
fd95541e | 611 | struct printf_spec spec, const char *fmt) |
332d2e78 LT |
612 | { |
613 | #ifndef IO_RSRC_PRINTK_SIZE | |
28405372 | 614 | #define IO_RSRC_PRINTK_SIZE 6 |
332d2e78 LT |
615 | #endif |
616 | ||
617 | #ifndef MEM_RSRC_PRINTK_SIZE | |
28405372 | 618 | #define MEM_RSRC_PRINTK_SIZE 10 |
332d2e78 | 619 | #endif |
c91d3376 | 620 | struct printf_spec hex_spec = { |
fef20d9c FW |
621 | .base = 16, |
622 | .precision = -1, | |
623 | .flags = SPECIAL | SMALL | ZEROPAD, | |
624 | }; | |
c91d3376 BH |
625 | struct printf_spec dec_spec = { |
626 | .base = 10, | |
627 | .precision = -1, | |
628 | .flags = 0, | |
629 | }; | |
fd95541e BH |
630 | struct printf_spec str_spec = { |
631 | .field_width = -1, | |
632 | .precision = 10, | |
633 | .flags = LEFT, | |
634 | }; | |
635 | struct printf_spec flag_spec = { | |
636 | .base = 16, | |
637 | .precision = -1, | |
638 | .flags = SPECIAL | SMALL, | |
639 | }; | |
c7dabef8 BH |
640 | |
641 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) | |
642 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ | |
643 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) | |
644 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) | |
645 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref disabled]") | |
646 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") | |
647 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, | |
648 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; | |
649 | ||
332d2e78 | 650 | char *p = sym, *pend = sym + sizeof(sym); |
c91d3376 | 651 | int size = -1, addr = 0; |
c7dabef8 | 652 | int decode = (fmt[0] == 'R') ? 1 : 0; |
332d2e78 | 653 | |
c91d3376 | 654 | if (res->flags & IORESOURCE_IO) { |
332d2e78 | 655 | size = IO_RSRC_PRINTK_SIZE; |
c91d3376 BH |
656 | addr = 1; |
657 | } else if (res->flags & IORESOURCE_MEM) { | |
332d2e78 | 658 | size = MEM_RSRC_PRINTK_SIZE; |
c91d3376 BH |
659 | addr = 1; |
660 | } | |
332d2e78 LT |
661 | |
662 | *p++ = '['; | |
c7dabef8 BH |
663 | if (res->flags & IORESOURCE_IO) |
664 | p = string(p, pend, "io ", str_spec); | |
665 | else if (res->flags & IORESOURCE_MEM) | |
666 | p = string(p, pend, "mem ", str_spec); | |
667 | else if (res->flags & IORESOURCE_IRQ) | |
668 | p = string(p, pend, "irq ", str_spec); | |
669 | else if (res->flags & IORESOURCE_DMA) | |
670 | p = string(p, pend, "dma ", str_spec); | |
671 | else { | |
672 | p = string(p, pend, "??? ", str_spec); | |
673 | decode = 0; | |
fd95541e | 674 | } |
c91d3376 BH |
675 | hex_spec.field_width = size; |
676 | p = number(p, pend, res->start, addr ? hex_spec : dec_spec); | |
677 | if (res->start != res->end) { | |
678 | *p++ = '-'; | |
679 | p = number(p, pend, res->end, addr ? hex_spec : dec_spec); | |
680 | } | |
c7dabef8 | 681 | if (decode) { |
fd95541e BH |
682 | if (res->flags & IORESOURCE_MEM_64) |
683 | p = string(p, pend, " 64bit", str_spec); | |
684 | if (res->flags & IORESOURCE_PREFETCH) | |
685 | p = string(p, pend, " pref", str_spec); | |
686 | if (res->flags & IORESOURCE_DISABLED) | |
687 | p = string(p, pend, " disabled", str_spec); | |
c7dabef8 BH |
688 | } else { |
689 | p = string(p, pend, " flags ", str_spec); | |
690 | p = number(p, pend, res->flags, flag_spec); | |
fd95541e | 691 | } |
332d2e78 | 692 | *p++ = ']'; |
c7dabef8 | 693 | *p = '\0'; |
332d2e78 | 694 | |
fef20d9c | 695 | return string(buf, end, sym, spec); |
332d2e78 LT |
696 | } |
697 | ||
fef20d9c | 698 | static char *mac_address_string(char *buf, char *end, u8 *addr, |
8a27f7c9 | 699 | struct printf_spec spec, const char *fmt) |
dd45c9cf | 700 | { |
8a27f7c9 | 701 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; |
dd45c9cf HH |
702 | char *p = mac_addr; |
703 | int i; | |
704 | ||
705 | for (i = 0; i < 6; i++) { | |
706 | p = pack_hex_byte(p, addr[i]); | |
8a27f7c9 | 707 | if (fmt[0] == 'M' && i != 5) |
dd45c9cf HH |
708 | *p++ = ':'; |
709 | } | |
710 | *p = '\0'; | |
711 | ||
fef20d9c | 712 | return string(buf, end, mac_addr, spec); |
dd45c9cf HH |
713 | } |
714 | ||
8a27f7c9 JP |
715 | static char *ip4_string(char *p, const u8 *addr, bool leading_zeros) |
716 | { | |
717 | int i; | |
718 | ||
719 | for (i = 0; i < 4; i++) { | |
720 | char temp[3]; /* hold each IP quad in reverse order */ | |
721 | int digits = put_dec_trunc(temp, addr[i]) - temp; | |
722 | if (leading_zeros) { | |
723 | if (digits < 3) | |
724 | *p++ = '0'; | |
725 | if (digits < 2) | |
726 | *p++ = '0'; | |
727 | } | |
728 | /* reverse the digits in the quad */ | |
729 | while (digits--) | |
730 | *p++ = temp[digits]; | |
731 | if (i < 3) | |
732 | *p++ = '.'; | |
733 | } | |
8a27f7c9 | 734 | *p = '\0'; |
7b9186f5 | 735 | |
8a27f7c9 JP |
736 | return p; |
737 | } | |
738 | ||
eb78cd26 | 739 | static char *ip6_compressed_string(char *p, const char *addr) |
689afa7d | 740 | { |
7b9186f5 | 741 | int i, j, range; |
8a27f7c9 JP |
742 | unsigned char zerolength[8]; |
743 | int longest = 1; | |
744 | int colonpos = -1; | |
745 | u16 word; | |
7b9186f5 | 746 | u8 hi, lo; |
8a27f7c9 | 747 | bool needcolon = false; |
eb78cd26 JP |
748 | bool useIPv4; |
749 | struct in6_addr in6; | |
750 | ||
751 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
752 | ||
753 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
8a27f7c9 JP |
754 | |
755 | memset(zerolength, 0, sizeof(zerolength)); | |
756 | ||
757 | if (useIPv4) | |
758 | range = 6; | |
759 | else | |
760 | range = 8; | |
761 | ||
762 | /* find position of longest 0 run */ | |
763 | for (i = 0; i < range; i++) { | |
764 | for (j = i; j < range; j++) { | |
eb78cd26 | 765 | if (in6.s6_addr16[j] != 0) |
8a27f7c9 JP |
766 | break; |
767 | zerolength[i]++; | |
768 | } | |
769 | } | |
770 | for (i = 0; i < range; i++) { | |
771 | if (zerolength[i] > longest) { | |
772 | longest = zerolength[i]; | |
773 | colonpos = i; | |
774 | } | |
775 | } | |
689afa7d | 776 | |
8a27f7c9 JP |
777 | /* emit address */ |
778 | for (i = 0; i < range; i++) { | |
779 | if (i == colonpos) { | |
780 | if (needcolon || i == 0) | |
781 | *p++ = ':'; | |
782 | *p++ = ':'; | |
783 | needcolon = false; | |
784 | i += longest - 1; | |
785 | continue; | |
786 | } | |
787 | if (needcolon) { | |
788 | *p++ = ':'; | |
789 | needcolon = false; | |
790 | } | |
791 | /* hex u16 without leading 0s */ | |
eb78cd26 | 792 | word = ntohs(in6.s6_addr16[i]); |
8a27f7c9 JP |
793 | hi = word >> 8; |
794 | lo = word & 0xff; | |
795 | if (hi) { | |
796 | if (hi > 0x0f) | |
797 | p = pack_hex_byte(p, hi); | |
798 | else | |
799 | *p++ = hex_asc_lo(hi); | |
b5ff992b | 800 | p = pack_hex_byte(p, lo); |
8a27f7c9 | 801 | } |
b5ff992b | 802 | else if (lo > 0x0f) |
8a27f7c9 JP |
803 | p = pack_hex_byte(p, lo); |
804 | else | |
805 | *p++ = hex_asc_lo(lo); | |
806 | needcolon = true; | |
807 | } | |
808 | ||
809 | if (useIPv4) { | |
810 | if (needcolon) | |
811 | *p++ = ':'; | |
eb78cd26 | 812 | p = ip4_string(p, &in6.s6_addr[12], false); |
8a27f7c9 | 813 | } |
8a27f7c9 | 814 | *p = '\0'; |
7b9186f5 | 815 | |
8a27f7c9 JP |
816 | return p; |
817 | } | |
818 | ||
eb78cd26 | 819 | static char *ip6_string(char *p, const char *addr, const char *fmt) |
8a27f7c9 JP |
820 | { |
821 | int i; | |
7b9186f5 | 822 | |
689afa7d | 823 | for (i = 0; i < 8; i++) { |
eb78cd26 JP |
824 | p = pack_hex_byte(p, *addr++); |
825 | p = pack_hex_byte(p, *addr++); | |
8a27f7c9 | 826 | if (fmt[0] == 'I' && i != 7) |
689afa7d HH |
827 | *p++ = ':'; |
828 | } | |
829 | *p = '\0'; | |
7b9186f5 | 830 | |
8a27f7c9 JP |
831 | return p; |
832 | } | |
833 | ||
834 | static char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
835 | struct printf_spec spec, const char *fmt) | |
836 | { | |
837 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
838 | ||
839 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
eb78cd26 | 840 | ip6_compressed_string(ip6_addr, addr); |
8a27f7c9 | 841 | else |
eb78cd26 | 842 | ip6_string(ip6_addr, addr, fmt); |
689afa7d | 843 | |
fef20d9c | 844 | return string(buf, end, ip6_addr, spec); |
689afa7d HH |
845 | } |
846 | ||
8a27f7c9 JP |
847 | static char *ip4_addr_string(char *buf, char *end, const u8 *addr, |
848 | struct printf_spec spec, const char *fmt) | |
4aa99606 | 849 | { |
8a27f7c9 | 850 | char ip4_addr[sizeof("255.255.255.255")]; |
4aa99606 | 851 | |
8a27f7c9 | 852 | ip4_string(ip4_addr, addr, fmt[0] == 'i'); |
4aa99606 | 853 | |
fef20d9c | 854 | return string(buf, end, ip4_addr, spec); |
4aa99606 HH |
855 | } |
856 | ||
4d8a743c LT |
857 | /* |
858 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
859 | * by an extra set of alphanumeric characters that are extended format | |
860 | * specifiers. | |
861 | * | |
332d2e78 LT |
862 | * Right now we handle: |
863 | * | |
0c8b946e FW |
864 | * - 'F' For symbolic function descriptor pointers with offset |
865 | * - 'f' For simple symbolic function names without offset | |
0efb4d20 SR |
866 | * - 'S' For symbolic direct pointers with offset |
867 | * - 's' For symbolic direct pointers without offset | |
c7dabef8 BH |
868 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] |
869 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] | |
dd45c9cf HH |
870 | * - 'M' For a 6-byte MAC address, it prints the address in the |
871 | * usual colon-separated hex notation | |
8a27f7c9 JP |
872 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons |
873 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way | |
874 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
875 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
876 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses | |
877 | * IPv6 omits the colons (01020304...0f) | |
878 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
879 | * - 'I6c' for IPv6 addresses printed as specified by | |
880 | * http://www.ietf.org/id/draft-kawamura-ipv6-text-representation-03.txt | |
332d2e78 LT |
881 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 |
882 | * function pointers are really function descriptors, which contain a | |
883 | * pointer to the real address. | |
4d8a743c | 884 | */ |
fef20d9c FW |
885 | static char *pointer(const char *fmt, char *buf, char *end, void *ptr, |
886 | struct printf_spec spec) | |
78a8bf69 | 887 | { |
d97106ab | 888 | if (!ptr) |
fef20d9c | 889 | return string(buf, end, "(null)", spec); |
d97106ab | 890 | |
0fe1ef24 LT |
891 | switch (*fmt) { |
892 | case 'F': | |
0c8b946e | 893 | case 'f': |
0fe1ef24 LT |
894 | ptr = dereference_function_descriptor(ptr); |
895 | /* Fallthrough */ | |
d4be151b | 896 | case 's': |
0fe1ef24 | 897 | case 'S': |
0c8b946e | 898 | return symbol_string(buf, end, ptr, spec, *fmt); |
332d2e78 | 899 | case 'R': |
c7dabef8 | 900 | case 'r': |
fd95541e | 901 | return resource_string(buf, end, ptr, spec, fmt); |
8a27f7c9 JP |
902 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
903 | case 'm': /* Contiguous: 000102030405 */ | |
904 | return mac_address_string(buf, end, ptr, spec, fmt); | |
905 | case 'I': /* Formatted IP supported | |
906 | * 4: 1.2.3.4 | |
907 | * 6: 0001:0203:...:0708 | |
908 | * 6c: 1::708 or 1::1.2.3.4 | |
909 | */ | |
910 | case 'i': /* Contiguous: | |
911 | * 4: 001.002.003.004 | |
912 | * 6: 000102...0f | |
913 | */ | |
914 | switch (fmt[1]) { | |
915 | case '6': | |
916 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
917 | case '4': | |
918 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
919 | } | |
fef20d9c FW |
920 | break; |
921 | } | |
922 | spec.flags |= SMALL; | |
923 | if (spec.field_width == -1) { | |
924 | spec.field_width = 2*sizeof(void *); | |
925 | spec.flags |= ZEROPAD; | |
926 | } | |
927 | spec.base = 16; | |
928 | ||
929 | return number(buf, end, (unsigned long) ptr, spec); | |
930 | } | |
931 | ||
932 | /* | |
933 | * Helper function to decode printf style format. | |
934 | * Each call decode a token from the format and return the | |
935 | * number of characters read (or likely the delta where it wants | |
936 | * to go on the next call). | |
937 | * The decoded token is returned through the parameters | |
938 | * | |
939 | * 'h', 'l', or 'L' for integer fields | |
940 | * 'z' support added 23/7/1999 S.H. | |
941 | * 'z' changed to 'Z' --davidm 1/25/99 | |
942 | * 't' added for ptrdiff_t | |
943 | * | |
944 | * @fmt: the format string | |
945 | * @type of the token returned | |
946 | * @flags: various flags such as +, -, # tokens.. | |
947 | * @field_width: overwritten width | |
948 | * @base: base of the number (octal, hex, ...) | |
949 | * @precision: precision of a number | |
950 | * @qualifier: qualifier of a number (long, size_t, ...) | |
951 | */ | |
952 | static int format_decode(const char *fmt, struct printf_spec *spec) | |
953 | { | |
954 | const char *start = fmt; | |
fef20d9c FW |
955 | |
956 | /* we finished early by reading the field width */ | |
ed681a91 | 957 | if (spec->type == FORMAT_TYPE_WIDTH) { |
fef20d9c FW |
958 | if (spec->field_width < 0) { |
959 | spec->field_width = -spec->field_width; | |
960 | spec->flags |= LEFT; | |
961 | } | |
962 | spec->type = FORMAT_TYPE_NONE; | |
963 | goto precision; | |
964 | } | |
965 | ||
966 | /* we finished early by reading the precision */ | |
967 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
968 | if (spec->precision < 0) | |
969 | spec->precision = 0; | |
970 | ||
971 | spec->type = FORMAT_TYPE_NONE; | |
972 | goto qualifier; | |
973 | } | |
974 | ||
975 | /* By default */ | |
976 | spec->type = FORMAT_TYPE_NONE; | |
977 | ||
978 | for (; *fmt ; ++fmt) { | |
979 | if (*fmt == '%') | |
980 | break; | |
981 | } | |
982 | ||
983 | /* Return the current non-format string */ | |
984 | if (fmt != start || !*fmt) | |
985 | return fmt - start; | |
986 | ||
987 | /* Process flags */ | |
988 | spec->flags = 0; | |
989 | ||
990 | while (1) { /* this also skips first '%' */ | |
991 | bool found = true; | |
992 | ||
993 | ++fmt; | |
994 | ||
995 | switch (*fmt) { | |
996 | case '-': spec->flags |= LEFT; break; | |
997 | case '+': spec->flags |= PLUS; break; | |
998 | case ' ': spec->flags |= SPACE; break; | |
999 | case '#': spec->flags |= SPECIAL; break; | |
1000 | case '0': spec->flags |= ZEROPAD; break; | |
1001 | default: found = false; | |
1002 | } | |
1003 | ||
1004 | if (!found) | |
1005 | break; | |
1006 | } | |
1007 | ||
1008 | /* get field width */ | |
1009 | spec->field_width = -1; | |
1010 | ||
1011 | if (isdigit(*fmt)) | |
1012 | spec->field_width = skip_atoi(&fmt); | |
1013 | else if (*fmt == '*') { | |
1014 | /* it's the next argument */ | |
ed681a91 | 1015 | spec->type = FORMAT_TYPE_WIDTH; |
fef20d9c FW |
1016 | return ++fmt - start; |
1017 | } | |
1018 | ||
1019 | precision: | |
1020 | /* get the precision */ | |
1021 | spec->precision = -1; | |
1022 | if (*fmt == '.') { | |
1023 | ++fmt; | |
1024 | if (isdigit(*fmt)) { | |
1025 | spec->precision = skip_atoi(&fmt); | |
1026 | if (spec->precision < 0) | |
1027 | spec->precision = 0; | |
1028 | } else if (*fmt == '*') { | |
1029 | /* it's the next argument */ | |
adf26f84 | 1030 | spec->type = FORMAT_TYPE_PRECISION; |
fef20d9c FW |
1031 | return ++fmt - start; |
1032 | } | |
1033 | } | |
1034 | ||
1035 | qualifier: | |
1036 | /* get the conversion qualifier */ | |
1037 | spec->qualifier = -1; | |
08562cb2 AGR |
1038 | if (*fmt == 'h' || TOLOWER(*fmt) == 'l' || |
1039 | TOLOWER(*fmt) == 'z' || *fmt == 't') { | |
a4e94ef0 Z |
1040 | spec->qualifier = *fmt++; |
1041 | if (unlikely(spec->qualifier == *fmt)) { | |
1042 | if (spec->qualifier == 'l') { | |
1043 | spec->qualifier = 'L'; | |
1044 | ++fmt; | |
1045 | } else if (spec->qualifier == 'h') { | |
1046 | spec->qualifier = 'H'; | |
1047 | ++fmt; | |
1048 | } | |
fef20d9c FW |
1049 | } |
1050 | } | |
1051 | ||
1052 | /* default base */ | |
1053 | spec->base = 10; | |
1054 | switch (*fmt) { | |
1055 | case 'c': | |
1056 | spec->type = FORMAT_TYPE_CHAR; | |
1057 | return ++fmt - start; | |
1058 | ||
1059 | case 's': | |
1060 | spec->type = FORMAT_TYPE_STR; | |
1061 | return ++fmt - start; | |
1062 | ||
1063 | case 'p': | |
1064 | spec->type = FORMAT_TYPE_PTR; | |
1065 | return fmt - start; | |
1066 | /* skip alnum */ | |
1067 | ||
1068 | case 'n': | |
1069 | spec->type = FORMAT_TYPE_NRCHARS; | |
1070 | return ++fmt - start; | |
1071 | ||
1072 | case '%': | |
1073 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
1074 | return ++fmt - start; | |
1075 | ||
1076 | /* integer number formats - set up the flags and "break" */ | |
1077 | case 'o': | |
1078 | spec->base = 8; | |
1079 | break; | |
1080 | ||
1081 | case 'x': | |
1082 | spec->flags |= SMALL; | |
1083 | ||
1084 | case 'X': | |
1085 | spec->base = 16; | |
1086 | break; | |
1087 | ||
1088 | case 'd': | |
1089 | case 'i': | |
39e874f8 | 1090 | spec->flags |= SIGN; |
fef20d9c | 1091 | case 'u': |
4aa99606 | 1092 | break; |
fef20d9c FW |
1093 | |
1094 | default: | |
1095 | spec->type = FORMAT_TYPE_INVALID; | |
1096 | return fmt - start; | |
0fe1ef24 | 1097 | } |
fef20d9c FW |
1098 | |
1099 | if (spec->qualifier == 'L') | |
1100 | spec->type = FORMAT_TYPE_LONG_LONG; | |
1101 | else if (spec->qualifier == 'l') { | |
39e874f8 | 1102 | if (spec->flags & SIGN) |
fef20d9c FW |
1103 | spec->type = FORMAT_TYPE_LONG; |
1104 | else | |
1105 | spec->type = FORMAT_TYPE_ULONG; | |
08562cb2 | 1106 | } else if (TOLOWER(spec->qualifier) == 'z') { |
fef20d9c FW |
1107 | spec->type = FORMAT_TYPE_SIZE_T; |
1108 | } else if (spec->qualifier == 't') { | |
1109 | spec->type = FORMAT_TYPE_PTRDIFF; | |
a4e94ef0 Z |
1110 | } else if (spec->qualifier == 'H') { |
1111 | if (spec->flags & SIGN) | |
1112 | spec->type = FORMAT_TYPE_BYTE; | |
1113 | else | |
1114 | spec->type = FORMAT_TYPE_UBYTE; | |
fef20d9c | 1115 | } else if (spec->qualifier == 'h') { |
39e874f8 | 1116 | if (spec->flags & SIGN) |
fef20d9c FW |
1117 | spec->type = FORMAT_TYPE_SHORT; |
1118 | else | |
1119 | spec->type = FORMAT_TYPE_USHORT; | |
1120 | } else { | |
39e874f8 | 1121 | if (spec->flags & SIGN) |
fef20d9c FW |
1122 | spec->type = FORMAT_TYPE_INT; |
1123 | else | |
1124 | spec->type = FORMAT_TYPE_UINT; | |
78a8bf69 | 1125 | } |
fef20d9c FW |
1126 | |
1127 | return ++fmt - start; | |
78a8bf69 LT |
1128 | } |
1129 | ||
1da177e4 LT |
1130 | /** |
1131 | * vsnprintf - Format a string and place it in a buffer | |
1132 | * @buf: The buffer to place the result into | |
1133 | * @size: The size of the buffer, including the trailing null space | |
1134 | * @fmt: The format string to use | |
1135 | * @args: Arguments for the format string | |
1136 | * | |
20036fdc | 1137 | * This function follows C99 vsnprintf, but has some extensions: |
91adcd2c SR |
1138 | * %pS output the name of a text symbol with offset |
1139 | * %ps output the name of a text symbol without offset | |
0c8b946e FW |
1140 | * %pF output the name of a function pointer with its offset |
1141 | * %pf output the name of a function pointer without its offset | |
332d2e78 | 1142 | * %pR output the address range in a struct resource |
0efb4d20 | 1143 | * %n is ignored |
20036fdc | 1144 | * |
1da177e4 LT |
1145 | * The return value is the number of characters which would |
1146 | * be generated for the given input, excluding the trailing | |
1147 | * '\0', as per ISO C99. If you want to have the exact | |
1148 | * number of characters written into @buf as return value | |
72fd4a35 | 1149 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
1150 | * return is greater than or equal to @size, the resulting |
1151 | * string is truncated. | |
1152 | * | |
1153 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 1154 | * You probably want snprintf() instead. |
1da177e4 LT |
1155 | */ |
1156 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1157 | { | |
1da177e4 | 1158 | unsigned long long num; |
d4be151b | 1159 | char *str, *end; |
fef20d9c | 1160 | struct printf_spec spec = {0}; |
1da177e4 | 1161 | |
f796937a JF |
1162 | /* Reject out-of-range values early. Large positive sizes are |
1163 | used for unknown buffer sizes. */ | |
2f30b1f9 | 1164 | if (WARN_ON_ONCE((int) size < 0)) |
1da177e4 | 1165 | return 0; |
1da177e4 LT |
1166 | |
1167 | str = buf; | |
f796937a | 1168 | end = buf + size; |
1da177e4 | 1169 | |
f796937a JF |
1170 | /* Make sure end is always >= buf */ |
1171 | if (end < buf) { | |
1172 | end = ((void *)-1); | |
1173 | size = end - buf; | |
1da177e4 LT |
1174 | } |
1175 | ||
fef20d9c FW |
1176 | while (*fmt) { |
1177 | const char *old_fmt = fmt; | |
d4be151b | 1178 | int read = format_decode(fmt, &spec); |
1da177e4 | 1179 | |
fef20d9c | 1180 | fmt += read; |
1da177e4 | 1181 | |
fef20d9c FW |
1182 | switch (spec.type) { |
1183 | case FORMAT_TYPE_NONE: { | |
1184 | int copy = read; | |
1185 | if (str < end) { | |
1186 | if (copy > end - str) | |
1187 | copy = end - str; | |
1188 | memcpy(str, old_fmt, copy); | |
1da177e4 | 1189 | } |
fef20d9c FW |
1190 | str += read; |
1191 | break; | |
1da177e4 LT |
1192 | } |
1193 | ||
ed681a91 | 1194 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1195 | spec.field_width = va_arg(args, int); |
1196 | break; | |
1da177e4 | 1197 | |
fef20d9c FW |
1198 | case FORMAT_TYPE_PRECISION: |
1199 | spec.precision = va_arg(args, int); | |
1200 | break; | |
1da177e4 | 1201 | |
d4be151b AGR |
1202 | case FORMAT_TYPE_CHAR: { |
1203 | char c; | |
1204 | ||
fef20d9c FW |
1205 | if (!(spec.flags & LEFT)) { |
1206 | while (--spec.field_width > 0) { | |
f796937a | 1207 | if (str < end) |
1da177e4 LT |
1208 | *str = ' '; |
1209 | ++str; | |
1da177e4 | 1210 | |
fef20d9c FW |
1211 | } |
1212 | } | |
1213 | c = (unsigned char) va_arg(args, int); | |
1214 | if (str < end) | |
1215 | *str = c; | |
1216 | ++str; | |
1217 | while (--spec.field_width > 0) { | |
f796937a | 1218 | if (str < end) |
fef20d9c | 1219 | *str = ' '; |
1da177e4 | 1220 | ++str; |
fef20d9c FW |
1221 | } |
1222 | break; | |
d4be151b | 1223 | } |
1da177e4 | 1224 | |
fef20d9c FW |
1225 | case FORMAT_TYPE_STR: |
1226 | str = string(str, end, va_arg(args, char *), spec); | |
1227 | break; | |
1da177e4 | 1228 | |
fef20d9c FW |
1229 | case FORMAT_TYPE_PTR: |
1230 | str = pointer(fmt+1, str, end, va_arg(args, void *), | |
1231 | spec); | |
1232 | while (isalnum(*fmt)) | |
1233 | fmt++; | |
1234 | break; | |
1da177e4 | 1235 | |
fef20d9c FW |
1236 | case FORMAT_TYPE_PERCENT_CHAR: |
1237 | if (str < end) | |
1238 | *str = '%'; | |
1239 | ++str; | |
1240 | break; | |
1da177e4 | 1241 | |
fef20d9c FW |
1242 | case FORMAT_TYPE_INVALID: |
1243 | if (str < end) | |
1244 | *str = '%'; | |
1245 | ++str; | |
fef20d9c FW |
1246 | break; |
1247 | ||
1248 | case FORMAT_TYPE_NRCHARS: { | |
1249 | int qualifier = spec.qualifier; | |
1250 | ||
1251 | if (qualifier == 'l') { | |
1252 | long *ip = va_arg(args, long *); | |
1253 | *ip = (str - buf); | |
08562cb2 | 1254 | } else if (TOLOWER(qualifier) == 'z') { |
fef20d9c FW |
1255 | size_t *ip = va_arg(args, size_t *); |
1256 | *ip = (str - buf); | |
1257 | } else { | |
1258 | int *ip = va_arg(args, int *); | |
1259 | *ip = (str - buf); | |
1260 | } | |
1261 | break; | |
1da177e4 | 1262 | } |
fef20d9c FW |
1263 | |
1264 | default: | |
1265 | switch (spec.type) { | |
1266 | case FORMAT_TYPE_LONG_LONG: | |
1267 | num = va_arg(args, long long); | |
1268 | break; | |
1269 | case FORMAT_TYPE_ULONG: | |
1270 | num = va_arg(args, unsigned long); | |
1271 | break; | |
1272 | case FORMAT_TYPE_LONG: | |
1273 | num = va_arg(args, long); | |
1274 | break; | |
1275 | case FORMAT_TYPE_SIZE_T: | |
1276 | num = va_arg(args, size_t); | |
1277 | break; | |
1278 | case FORMAT_TYPE_PTRDIFF: | |
1279 | num = va_arg(args, ptrdiff_t); | |
1280 | break; | |
a4e94ef0 Z |
1281 | case FORMAT_TYPE_UBYTE: |
1282 | num = (unsigned char) va_arg(args, int); | |
1283 | break; | |
1284 | case FORMAT_TYPE_BYTE: | |
1285 | num = (signed char) va_arg(args, int); | |
1286 | break; | |
fef20d9c FW |
1287 | case FORMAT_TYPE_USHORT: |
1288 | num = (unsigned short) va_arg(args, int); | |
1289 | break; | |
1290 | case FORMAT_TYPE_SHORT: | |
1291 | num = (short) va_arg(args, int); | |
1292 | break; | |
39e874f8 FW |
1293 | case FORMAT_TYPE_INT: |
1294 | num = (int) va_arg(args, int); | |
fef20d9c FW |
1295 | break; |
1296 | default: | |
1297 | num = va_arg(args, unsigned int); | |
1298 | } | |
1299 | ||
1300 | str = number(str, end, num, spec); | |
1da177e4 | 1301 | } |
1da177e4 | 1302 | } |
fef20d9c | 1303 | |
f796937a JF |
1304 | if (size > 0) { |
1305 | if (str < end) | |
1306 | *str = '\0'; | |
1307 | else | |
0a6047ee | 1308 | end[-1] = '\0'; |
f796937a | 1309 | } |
fef20d9c | 1310 | |
f796937a | 1311 | /* the trailing null byte doesn't count towards the total */ |
1da177e4 | 1312 | return str-buf; |
fef20d9c | 1313 | |
1da177e4 | 1314 | } |
1da177e4 LT |
1315 | EXPORT_SYMBOL(vsnprintf); |
1316 | ||
1317 | /** | |
1318 | * vscnprintf - Format a string and place it in a buffer | |
1319 | * @buf: The buffer to place the result into | |
1320 | * @size: The size of the buffer, including the trailing null space | |
1321 | * @fmt: The format string to use | |
1322 | * @args: Arguments for the format string | |
1323 | * | |
1324 | * The return value is the number of characters which have been written into | |
1325 | * the @buf not including the trailing '\0'. If @size is <= 0 the function | |
1326 | * returns 0. | |
1327 | * | |
1328 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 1329 | * You probably want scnprintf() instead. |
20036fdc AK |
1330 | * |
1331 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1332 | */ |
1333 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1334 | { | |
1335 | int i; | |
1336 | ||
7b9186f5 AGR |
1337 | i = vsnprintf(buf, size, fmt, args); |
1338 | ||
1da177e4 LT |
1339 | return (i >= size) ? (size - 1) : i; |
1340 | } | |
1da177e4 LT |
1341 | EXPORT_SYMBOL(vscnprintf); |
1342 | ||
1343 | /** | |
1344 | * snprintf - Format a string and place it in a buffer | |
1345 | * @buf: The buffer to place the result into | |
1346 | * @size: The size of the buffer, including the trailing null space | |
1347 | * @fmt: The format string to use | |
1348 | * @...: Arguments for the format string | |
1349 | * | |
1350 | * The return value is the number of characters which would be | |
1351 | * generated for the given input, excluding the trailing null, | |
1352 | * as per ISO C99. If the return is greater than or equal to | |
1353 | * @size, the resulting string is truncated. | |
20036fdc AK |
1354 | * |
1355 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 1356 | */ |
7b9186f5 | 1357 | int snprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
1358 | { |
1359 | va_list args; | |
1360 | int i; | |
1361 | ||
1362 | va_start(args, fmt); | |
7b9186f5 | 1363 | i = vsnprintf(buf, size, fmt, args); |
1da177e4 | 1364 | va_end(args); |
7b9186f5 | 1365 | |
1da177e4 LT |
1366 | return i; |
1367 | } | |
1da177e4 LT |
1368 | EXPORT_SYMBOL(snprintf); |
1369 | ||
1370 | /** | |
1371 | * scnprintf - Format a string and place it in a buffer | |
1372 | * @buf: The buffer to place the result into | |
1373 | * @size: The size of the buffer, including the trailing null space | |
1374 | * @fmt: The format string to use | |
1375 | * @...: Arguments for the format string | |
1376 | * | |
1377 | * The return value is the number of characters written into @buf not including | |
ea6f3281 | 1378 | * the trailing '\0'. If @size is <= 0 the function returns 0. |
1da177e4 LT |
1379 | */ |
1380 | ||
7b9186f5 | 1381 | int scnprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
1382 | { |
1383 | va_list args; | |
1384 | int i; | |
1385 | ||
1386 | va_start(args, fmt); | |
1387 | i = vsnprintf(buf, size, fmt, args); | |
1388 | va_end(args); | |
7b9186f5 | 1389 | |
1da177e4 LT |
1390 | return (i >= size) ? (size - 1) : i; |
1391 | } | |
1392 | EXPORT_SYMBOL(scnprintf); | |
1393 | ||
1394 | /** | |
1395 | * vsprintf - Format a string and place it in a buffer | |
1396 | * @buf: The buffer to place the result into | |
1397 | * @fmt: The format string to use | |
1398 | * @args: Arguments for the format string | |
1399 | * | |
1400 | * The function returns the number of characters written | |
72fd4a35 | 1401 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
1402 | * buffer overflows. |
1403 | * | |
1404 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 1405 | * You probably want sprintf() instead. |
20036fdc AK |
1406 | * |
1407 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1408 | */ |
1409 | int vsprintf(char *buf, const char *fmt, va_list args) | |
1410 | { | |
1411 | return vsnprintf(buf, INT_MAX, fmt, args); | |
1412 | } | |
1da177e4 LT |
1413 | EXPORT_SYMBOL(vsprintf); |
1414 | ||
1415 | /** | |
1416 | * sprintf - Format a string and place it in a buffer | |
1417 | * @buf: The buffer to place the result into | |
1418 | * @fmt: The format string to use | |
1419 | * @...: Arguments for the format string | |
1420 | * | |
1421 | * The function returns the number of characters written | |
72fd4a35 | 1422 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 | 1423 | * buffer overflows. |
20036fdc AK |
1424 | * |
1425 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 1426 | */ |
7b9186f5 | 1427 | int sprintf(char *buf, const char *fmt, ...) |
1da177e4 LT |
1428 | { |
1429 | va_list args; | |
1430 | int i; | |
1431 | ||
1432 | va_start(args, fmt); | |
7b9186f5 | 1433 | i = vsnprintf(buf, INT_MAX, fmt, args); |
1da177e4 | 1434 | va_end(args); |
7b9186f5 | 1435 | |
1da177e4 LT |
1436 | return i; |
1437 | } | |
1da177e4 LT |
1438 | EXPORT_SYMBOL(sprintf); |
1439 | ||
4370aa4a LJ |
1440 | #ifdef CONFIG_BINARY_PRINTF |
1441 | /* | |
1442 | * bprintf service: | |
1443 | * vbin_printf() - VA arguments to binary data | |
1444 | * bstr_printf() - Binary data to text string | |
1445 | */ | |
1446 | ||
1447 | /** | |
1448 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
1449 | * @bin_buf: The buffer to place args' binary value | |
1450 | * @size: The size of the buffer(by words(32bits), not characters) | |
1451 | * @fmt: The format string to use | |
1452 | * @args: Arguments for the format string | |
1453 | * | |
1454 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
1455 | * is skiped. | |
1456 | * | |
1457 | * The return value is the number of words(32bits) which would be generated for | |
1458 | * the given input. | |
1459 | * | |
1460 | * NOTE: | |
1461 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
1462 | * valid for bstr_printf(). | |
1463 | */ | |
1464 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
1465 | { | |
fef20d9c | 1466 | struct printf_spec spec = {0}; |
4370aa4a | 1467 | char *str, *end; |
4370aa4a LJ |
1468 | |
1469 | str = (char *)bin_buf; | |
1470 | end = (char *)(bin_buf + size); | |
1471 | ||
1472 | #define save_arg(type) \ | |
1473 | do { \ | |
1474 | if (sizeof(type) == 8) { \ | |
1475 | unsigned long long value; \ | |
1476 | str = PTR_ALIGN(str, sizeof(u32)); \ | |
1477 | value = va_arg(args, unsigned long long); \ | |
1478 | if (str + sizeof(type) <= end) { \ | |
1479 | *(u32 *)str = *(u32 *)&value; \ | |
1480 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ | |
1481 | } \ | |
1482 | } else { \ | |
1483 | unsigned long value; \ | |
1484 | str = PTR_ALIGN(str, sizeof(type)); \ | |
1485 | value = va_arg(args, int); \ | |
1486 | if (str + sizeof(type) <= end) \ | |
1487 | *(typeof(type) *)str = (type)value; \ | |
1488 | } \ | |
1489 | str += sizeof(type); \ | |
1490 | } while (0) | |
1491 | ||
fef20d9c | 1492 | while (*fmt) { |
d4be151b | 1493 | int read = format_decode(fmt, &spec); |
4370aa4a | 1494 | |
fef20d9c | 1495 | fmt += read; |
4370aa4a | 1496 | |
fef20d9c FW |
1497 | switch (spec.type) { |
1498 | case FORMAT_TYPE_NONE: | |
d4be151b AGR |
1499 | case FORMAT_TYPE_INVALID: |
1500 | case FORMAT_TYPE_PERCENT_CHAR: | |
fef20d9c FW |
1501 | break; |
1502 | ||
ed681a91 | 1503 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1504 | case FORMAT_TYPE_PRECISION: |
1505 | save_arg(int); | |
1506 | break; | |
1507 | ||
1508 | case FORMAT_TYPE_CHAR: | |
4370aa4a | 1509 | save_arg(char); |
fef20d9c FW |
1510 | break; |
1511 | ||
1512 | case FORMAT_TYPE_STR: { | |
4370aa4a LJ |
1513 | const char *save_str = va_arg(args, char *); |
1514 | size_t len; | |
6c356634 | 1515 | |
4370aa4a LJ |
1516 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE |
1517 | || (unsigned long)save_str < PAGE_SIZE) | |
0f4f81dc | 1518 | save_str = "(null)"; |
6c356634 AGR |
1519 | len = strlen(save_str) + 1; |
1520 | if (str + len < end) | |
1521 | memcpy(str, save_str, len); | |
1522 | str += len; | |
fef20d9c | 1523 | break; |
4370aa4a | 1524 | } |
fef20d9c FW |
1525 | |
1526 | case FORMAT_TYPE_PTR: | |
4370aa4a LJ |
1527 | save_arg(void *); |
1528 | /* skip all alphanumeric pointer suffixes */ | |
fef20d9c | 1529 | while (isalnum(*fmt)) |
4370aa4a | 1530 | fmt++; |
fef20d9c FW |
1531 | break; |
1532 | ||
fef20d9c | 1533 | case FORMAT_TYPE_NRCHARS: { |
4370aa4a | 1534 | /* skip %n 's argument */ |
fef20d9c | 1535 | int qualifier = spec.qualifier; |
4370aa4a LJ |
1536 | void *skip_arg; |
1537 | if (qualifier == 'l') | |
1538 | skip_arg = va_arg(args, long *); | |
08562cb2 | 1539 | else if (TOLOWER(qualifier) == 'z') |
4370aa4a LJ |
1540 | skip_arg = va_arg(args, size_t *); |
1541 | else | |
1542 | skip_arg = va_arg(args, int *); | |
fef20d9c | 1543 | break; |
4370aa4a | 1544 | } |
fef20d9c FW |
1545 | |
1546 | default: | |
1547 | switch (spec.type) { | |
1548 | ||
1549 | case FORMAT_TYPE_LONG_LONG: | |
4370aa4a | 1550 | save_arg(long long); |
fef20d9c FW |
1551 | break; |
1552 | case FORMAT_TYPE_ULONG: | |
1553 | case FORMAT_TYPE_LONG: | |
4370aa4a | 1554 | save_arg(unsigned long); |
fef20d9c FW |
1555 | break; |
1556 | case FORMAT_TYPE_SIZE_T: | |
4370aa4a | 1557 | save_arg(size_t); |
fef20d9c FW |
1558 | break; |
1559 | case FORMAT_TYPE_PTRDIFF: | |
4370aa4a | 1560 | save_arg(ptrdiff_t); |
fef20d9c | 1561 | break; |
a4e94ef0 Z |
1562 | case FORMAT_TYPE_UBYTE: |
1563 | case FORMAT_TYPE_BYTE: | |
1564 | save_arg(char); | |
1565 | break; | |
fef20d9c FW |
1566 | case FORMAT_TYPE_USHORT: |
1567 | case FORMAT_TYPE_SHORT: | |
4370aa4a | 1568 | save_arg(short); |
fef20d9c FW |
1569 | break; |
1570 | default: | |
4370aa4a | 1571 | save_arg(int); |
fef20d9c | 1572 | } |
4370aa4a LJ |
1573 | } |
1574 | } | |
fef20d9c | 1575 | |
7b9186f5 | 1576 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
fef20d9c | 1577 | #undef save_arg |
4370aa4a LJ |
1578 | } |
1579 | EXPORT_SYMBOL_GPL(vbin_printf); | |
1580 | ||
1581 | /** | |
1582 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
1583 | * @buf: The buffer to place the result into | |
1584 | * @size: The size of the buffer, including the trailing null space | |
1585 | * @fmt: The format string to use | |
1586 | * @bin_buf: Binary arguments for the format string | |
1587 | * | |
1588 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
1589 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
1590 | * a binary buffer that generated by vbin_printf. | |
1591 | * | |
1592 | * The format follows C99 vsnprintf, but has some extensions: | |
0efb4d20 | 1593 | * see vsnprintf comment for details. |
4370aa4a LJ |
1594 | * |
1595 | * The return value is the number of characters which would | |
1596 | * be generated for the given input, excluding the trailing | |
1597 | * '\0', as per ISO C99. If you want to have the exact | |
1598 | * number of characters written into @buf as return value | |
1599 | * (not including the trailing '\0'), use vscnprintf(). If the | |
1600 | * return is greater than or equal to @size, the resulting | |
1601 | * string is truncated. | |
1602 | */ | |
1603 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
1604 | { | |
fef20d9c | 1605 | struct printf_spec spec = {0}; |
d4be151b AGR |
1606 | char *str, *end; |
1607 | const char *args = (const char *)bin_buf; | |
4370aa4a | 1608 | |
2f30b1f9 | 1609 | if (WARN_ON_ONCE((int) size < 0)) |
4370aa4a | 1610 | return 0; |
4370aa4a LJ |
1611 | |
1612 | str = buf; | |
1613 | end = buf + size; | |
1614 | ||
1615 | #define get_arg(type) \ | |
1616 | ({ \ | |
1617 | typeof(type) value; \ | |
1618 | if (sizeof(type) == 8) { \ | |
1619 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
1620 | *(u32 *)&value = *(u32 *)args; \ | |
1621 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
1622 | } else { \ | |
1623 | args = PTR_ALIGN(args, sizeof(type)); \ | |
1624 | value = *(typeof(type) *)args; \ | |
1625 | } \ | |
1626 | args += sizeof(type); \ | |
1627 | value; \ | |
1628 | }) | |
1629 | ||
1630 | /* Make sure end is always >= buf */ | |
1631 | if (end < buf) { | |
1632 | end = ((void *)-1); | |
1633 | size = end - buf; | |
1634 | } | |
1635 | ||
fef20d9c | 1636 | while (*fmt) { |
fef20d9c | 1637 | const char *old_fmt = fmt; |
d4be151b | 1638 | int read = format_decode(fmt, &spec); |
4370aa4a | 1639 | |
fef20d9c | 1640 | fmt += read; |
4370aa4a | 1641 | |
fef20d9c FW |
1642 | switch (spec.type) { |
1643 | case FORMAT_TYPE_NONE: { | |
1644 | int copy = read; | |
1645 | if (str < end) { | |
1646 | if (copy > end - str) | |
1647 | copy = end - str; | |
1648 | memcpy(str, old_fmt, copy); | |
4370aa4a | 1649 | } |
fef20d9c FW |
1650 | str += read; |
1651 | break; | |
4370aa4a LJ |
1652 | } |
1653 | ||
ed681a91 | 1654 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1655 | spec.field_width = get_arg(int); |
1656 | break; | |
4370aa4a | 1657 | |
fef20d9c FW |
1658 | case FORMAT_TYPE_PRECISION: |
1659 | spec.precision = get_arg(int); | |
1660 | break; | |
4370aa4a | 1661 | |
d4be151b AGR |
1662 | case FORMAT_TYPE_CHAR: { |
1663 | char c; | |
1664 | ||
fef20d9c FW |
1665 | if (!(spec.flags & LEFT)) { |
1666 | while (--spec.field_width > 0) { | |
4370aa4a LJ |
1667 | if (str < end) |
1668 | *str = ' '; | |
1669 | ++str; | |
1670 | } | |
1671 | } | |
1672 | c = (unsigned char) get_arg(char); | |
1673 | if (str < end) | |
1674 | *str = c; | |
1675 | ++str; | |
fef20d9c | 1676 | while (--spec.field_width > 0) { |
4370aa4a LJ |
1677 | if (str < end) |
1678 | *str = ' '; | |
1679 | ++str; | |
1680 | } | |
fef20d9c | 1681 | break; |
d4be151b | 1682 | } |
4370aa4a | 1683 | |
fef20d9c | 1684 | case FORMAT_TYPE_STR: { |
4370aa4a | 1685 | const char *str_arg = args; |
d4be151b | 1686 | args += strlen(str_arg) + 1; |
fef20d9c FW |
1687 | str = string(str, end, (char *)str_arg, spec); |
1688 | break; | |
4370aa4a LJ |
1689 | } |
1690 | ||
fef20d9c FW |
1691 | case FORMAT_TYPE_PTR: |
1692 | str = pointer(fmt+1, str, end, get_arg(void *), spec); | |
1693 | while (isalnum(*fmt)) | |
4370aa4a | 1694 | fmt++; |
fef20d9c | 1695 | break; |
4370aa4a | 1696 | |
fef20d9c | 1697 | case FORMAT_TYPE_PERCENT_CHAR: |
fef20d9c | 1698 | case FORMAT_TYPE_INVALID: |
4370aa4a LJ |
1699 | if (str < end) |
1700 | *str = '%'; | |
1701 | ++str; | |
fef20d9c FW |
1702 | break; |
1703 | ||
1704 | case FORMAT_TYPE_NRCHARS: | |
1705 | /* skip */ | |
1706 | break; | |
1707 | ||
d4be151b AGR |
1708 | default: { |
1709 | unsigned long long num; | |
1710 | ||
fef20d9c FW |
1711 | switch (spec.type) { |
1712 | ||
1713 | case FORMAT_TYPE_LONG_LONG: | |
1714 | num = get_arg(long long); | |
1715 | break; | |
1716 | case FORMAT_TYPE_ULONG: | |
fef20d9c FW |
1717 | case FORMAT_TYPE_LONG: |
1718 | num = get_arg(unsigned long); | |
1719 | break; | |
1720 | case FORMAT_TYPE_SIZE_T: | |
1721 | num = get_arg(size_t); | |
1722 | break; | |
1723 | case FORMAT_TYPE_PTRDIFF: | |
1724 | num = get_arg(ptrdiff_t); | |
1725 | break; | |
a4e94ef0 Z |
1726 | case FORMAT_TYPE_UBYTE: |
1727 | num = get_arg(unsigned char); | |
1728 | break; | |
1729 | case FORMAT_TYPE_BYTE: | |
1730 | num = get_arg(signed char); | |
1731 | break; | |
fef20d9c FW |
1732 | case FORMAT_TYPE_USHORT: |
1733 | num = get_arg(unsigned short); | |
1734 | break; | |
1735 | case FORMAT_TYPE_SHORT: | |
1736 | num = get_arg(short); | |
1737 | break; | |
1738 | case FORMAT_TYPE_UINT: | |
1739 | num = get_arg(unsigned int); | |
1740 | break; | |
1741 | default: | |
1742 | num = get_arg(int); | |
1743 | } | |
1744 | ||
1745 | str = number(str, end, num, spec); | |
d4be151b AGR |
1746 | } /* default: */ |
1747 | } /* switch(spec.type) */ | |
1748 | } /* while(*fmt) */ | |
fef20d9c | 1749 | |
4370aa4a LJ |
1750 | if (size > 0) { |
1751 | if (str < end) | |
1752 | *str = '\0'; | |
1753 | else | |
1754 | end[-1] = '\0'; | |
1755 | } | |
fef20d9c | 1756 | |
4370aa4a LJ |
1757 | #undef get_arg |
1758 | ||
1759 | /* the trailing null byte doesn't count towards the total */ | |
1760 | return str - buf; | |
1761 | } | |
1762 | EXPORT_SYMBOL_GPL(bstr_printf); | |
1763 | ||
1764 | /** | |
1765 | * bprintf - Parse a format string and place args' binary value in a buffer | |
1766 | * @bin_buf: The buffer to place args' binary value | |
1767 | * @size: The size of the buffer(by words(32bits), not characters) | |
1768 | * @fmt: The format string to use | |
1769 | * @...: Arguments for the format string | |
1770 | * | |
1771 | * The function returns the number of words(u32) written | |
1772 | * into @bin_buf. | |
1773 | */ | |
1774 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
1775 | { | |
1776 | va_list args; | |
1777 | int ret; | |
1778 | ||
1779 | va_start(args, fmt); | |
1780 | ret = vbin_printf(bin_buf, size, fmt, args); | |
1781 | va_end(args); | |
7b9186f5 | 1782 | |
4370aa4a LJ |
1783 | return ret; |
1784 | } | |
1785 | EXPORT_SYMBOL_GPL(bprintf); | |
1786 | ||
1787 | #endif /* CONFIG_BINARY_PRINTF */ | |
1788 | ||
c5484d7c AGR |
1789 | static noinline char *skip_space(const char *str) |
1790 | { | |
1791 | while (isspace(*str)) | |
1792 | ++str; | |
1793 | return (char *)str; | |
1794 | } | |
1795 | ||
1da177e4 LT |
1796 | /** |
1797 | * vsscanf - Unformat a buffer into a list of arguments | |
1798 | * @buf: input buffer | |
1799 | * @fmt: format of buffer | |
1800 | * @args: arguments | |
1801 | */ | |
7b9186f5 | 1802 | int vsscanf(const char *buf, const char *fmt, va_list args) |
1da177e4 LT |
1803 | { |
1804 | const char *str = buf; | |
1805 | char *next; | |
1806 | char digit; | |
1807 | int num = 0; | |
7b9186f5 | 1808 | int qualifier, base, field_width; |
d4be151b | 1809 | bool is_sign; |
1da177e4 | 1810 | |
7b9186f5 | 1811 | while (*fmt && *str) { |
1da177e4 LT |
1812 | /* skip any white space in format */ |
1813 | /* white space in format matchs any amount of | |
1814 | * white space, including none, in the input. | |
1815 | */ | |
1816 | if (isspace(*fmt)) { | |
c5484d7c AGR |
1817 | fmt = skip_space(fmt); |
1818 | str = skip_space(str); | |
1da177e4 LT |
1819 | } |
1820 | ||
1821 | /* anything that is not a conversion must match exactly */ | |
1822 | if (*fmt != '%' && *fmt) { | |
1823 | if (*fmt++ != *str++) | |
1824 | break; | |
1825 | continue; | |
1826 | } | |
1827 | ||
1828 | if (!*fmt) | |
1829 | break; | |
1830 | ++fmt; | |
7b9186f5 | 1831 | |
1da177e4 LT |
1832 | /* skip this conversion. |
1833 | * advance both strings to next white space | |
1834 | */ | |
1835 | if (*fmt == '*') { | |
8fccae2c | 1836 | while (!isspace(*fmt) && *fmt != '%' && *fmt) |
1da177e4 LT |
1837 | fmt++; |
1838 | while (!isspace(*str) && *str) | |
1839 | str++; | |
1840 | continue; | |
1841 | } | |
1842 | ||
1843 | /* get field width */ | |
1844 | field_width = -1; | |
1845 | if (isdigit(*fmt)) | |
1846 | field_width = skip_atoi(&fmt); | |
1847 | ||
1848 | /* get conversion qualifier */ | |
1849 | qualifier = -1; | |
08562cb2 AGR |
1850 | if (*fmt == 'h' || TOLOWER(*fmt) == 'l' || |
1851 | TOLOWER(*fmt) == 'z') { | |
1da177e4 LT |
1852 | qualifier = *fmt++; |
1853 | if (unlikely(qualifier == *fmt)) { | |
1854 | if (qualifier == 'h') { | |
1855 | qualifier = 'H'; | |
1856 | fmt++; | |
1857 | } else if (qualifier == 'l') { | |
1858 | qualifier = 'L'; | |
1859 | fmt++; | |
1860 | } | |
1861 | } | |
1862 | } | |
1da177e4 LT |
1863 | |
1864 | if (!*fmt || !*str) | |
1865 | break; | |
1866 | ||
d4be151b AGR |
1867 | base = 10; |
1868 | is_sign = 0; | |
1869 | ||
7b9186f5 | 1870 | switch (*fmt++) { |
1da177e4 LT |
1871 | case 'c': |
1872 | { | |
7b9186f5 | 1873 | char *s = (char *)va_arg(args, char*); |
1da177e4 LT |
1874 | if (field_width == -1) |
1875 | field_width = 1; | |
1876 | do { | |
1877 | *s++ = *str++; | |
1878 | } while (--field_width > 0 && *str); | |
1879 | num++; | |
1880 | } | |
1881 | continue; | |
1882 | case 's': | |
1883 | { | |
7b9186f5 AGR |
1884 | char *s = (char *)va_arg(args, char *); |
1885 | if (field_width == -1) | |
1da177e4 LT |
1886 | field_width = INT_MAX; |
1887 | /* first, skip leading white space in buffer */ | |
c5484d7c | 1888 | str = skip_space(str); |
1da177e4 LT |
1889 | |
1890 | /* now copy until next white space */ | |
7b9186f5 | 1891 | while (*str && !isspace(*str) && field_width--) |
1da177e4 | 1892 | *s++ = *str++; |
1da177e4 LT |
1893 | *s = '\0'; |
1894 | num++; | |
1895 | } | |
1896 | continue; | |
1897 | case 'n': | |
1898 | /* return number of characters read so far */ | |
1899 | { | |
7b9186f5 | 1900 | int *i = (int *)va_arg(args, int*); |
1da177e4 LT |
1901 | *i = str - buf; |
1902 | } | |
1903 | continue; | |
1904 | case 'o': | |
1905 | base = 8; | |
1906 | break; | |
1907 | case 'x': | |
1908 | case 'X': | |
1909 | base = 16; | |
1910 | break; | |
1911 | case 'i': | |
7b9186f5 | 1912 | base = 0; |
1da177e4 LT |
1913 | case 'd': |
1914 | is_sign = 1; | |
1915 | case 'u': | |
1916 | break; | |
1917 | case '%': | |
1918 | /* looking for '%' in str */ | |
7b9186f5 | 1919 | if (*str++ != '%') |
1da177e4 LT |
1920 | return num; |
1921 | continue; | |
1922 | default: | |
1923 | /* invalid format; stop here */ | |
1924 | return num; | |
1925 | } | |
1926 | ||
1927 | /* have some sort of integer conversion. | |
1928 | * first, skip white space in buffer. | |
1929 | */ | |
c5484d7c | 1930 | str = skip_space(str); |
1da177e4 LT |
1931 | |
1932 | digit = *str; | |
1933 | if (is_sign && digit == '-') | |
1934 | digit = *(str + 1); | |
1935 | ||
1936 | if (!digit | |
7b9186f5 AGR |
1937 | || (base == 16 && !isxdigit(digit)) |
1938 | || (base == 10 && !isdigit(digit)) | |
1939 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
1940 | || (base == 0 && !isdigit(digit))) | |
1941 | break; | |
1da177e4 | 1942 | |
7b9186f5 | 1943 | switch (qualifier) { |
1da177e4 LT |
1944 | case 'H': /* that's 'hh' in format */ |
1945 | if (is_sign) { | |
7b9186f5 AGR |
1946 | signed char *s = (signed char *)va_arg(args, signed char *); |
1947 | *s = (signed char)simple_strtol(str, &next, base); | |
1da177e4 | 1948 | } else { |
7b9186f5 AGR |
1949 | unsigned char *s = (unsigned char *)va_arg(args, unsigned char *); |
1950 | *s = (unsigned char)simple_strtoul(str, &next, base); | |
1da177e4 LT |
1951 | } |
1952 | break; | |
1953 | case 'h': | |
1954 | if (is_sign) { | |
7b9186f5 AGR |
1955 | short *s = (short *)va_arg(args, short *); |
1956 | *s = (short)simple_strtol(str, &next, base); | |
1da177e4 | 1957 | } else { |
7b9186f5 AGR |
1958 | unsigned short *s = (unsigned short *)va_arg(args, unsigned short *); |
1959 | *s = (unsigned short)simple_strtoul(str, &next, base); | |
1da177e4 LT |
1960 | } |
1961 | break; | |
1962 | case 'l': | |
1963 | if (is_sign) { | |
7b9186f5 AGR |
1964 | long *l = (long *)va_arg(args, long *); |
1965 | *l = simple_strtol(str, &next, base); | |
1da177e4 | 1966 | } else { |
7b9186f5 AGR |
1967 | unsigned long *l = (unsigned long *)va_arg(args, unsigned long *); |
1968 | *l = simple_strtoul(str, &next, base); | |
1da177e4 LT |
1969 | } |
1970 | break; | |
1971 | case 'L': | |
1972 | if (is_sign) { | |
7b9186f5 AGR |
1973 | long long *l = (long long *)va_arg(args, long long *); |
1974 | *l = simple_strtoll(str, &next, base); | |
1da177e4 | 1975 | } else { |
7b9186f5 AGR |
1976 | unsigned long long *l = (unsigned long long *)va_arg(args, unsigned long long *); |
1977 | *l = simple_strtoull(str, &next, base); | |
1da177e4 LT |
1978 | } |
1979 | break; | |
1980 | case 'Z': | |
1981 | case 'z': | |
1982 | { | |
7b9186f5 AGR |
1983 | size_t *s = (size_t *)va_arg(args, size_t *); |
1984 | *s = (size_t)simple_strtoul(str, &next, base); | |
1da177e4 LT |
1985 | } |
1986 | break; | |
1987 | default: | |
1988 | if (is_sign) { | |
7b9186f5 AGR |
1989 | int *i = (int *)va_arg(args, int *); |
1990 | *i = (int)simple_strtol(str, &next, base); | |
1da177e4 | 1991 | } else { |
7b9186f5 AGR |
1992 | unsigned int *i = (unsigned int *)va_arg(args, unsigned int*); |
1993 | *i = (unsigned int)simple_strtoul(str, &next, base); | |
1da177e4 LT |
1994 | } |
1995 | break; | |
1996 | } | |
1997 | num++; | |
1998 | ||
1999 | if (!next) | |
2000 | break; | |
2001 | str = next; | |
2002 | } | |
c6b40d16 JB |
2003 | |
2004 | /* | |
2005 | * Now we've come all the way through so either the input string or the | |
2006 | * format ended. In the former case, there can be a %n at the current | |
2007 | * position in the format that needs to be filled. | |
2008 | */ | |
2009 | if (*fmt == '%' && *(fmt + 1) == 'n') { | |
2010 | int *p = (int *)va_arg(args, int *); | |
2011 | *p = str - buf; | |
2012 | } | |
2013 | ||
1da177e4 LT |
2014 | return num; |
2015 | } | |
1da177e4 LT |
2016 | EXPORT_SYMBOL(vsscanf); |
2017 | ||
2018 | /** | |
2019 | * sscanf - Unformat a buffer into a list of arguments | |
2020 | * @buf: input buffer | |
2021 | * @fmt: formatting of buffer | |
2022 | * @...: resulting arguments | |
2023 | */ | |
7b9186f5 | 2024 | int sscanf(const char *buf, const char *fmt, ...) |
1da177e4 LT |
2025 | { |
2026 | va_list args; | |
2027 | int i; | |
2028 | ||
7b9186f5 AGR |
2029 | va_start(args, fmt); |
2030 | i = vsscanf(buf, fmt, args); | |
1da177e4 | 2031 | va_end(args); |
7b9186f5 | 2032 | |
1da177e4 LT |
2033 | return i; |
2034 | } | |
1da177e4 | 2035 | EXPORT_SYMBOL(sscanf); |