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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 | ||
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> |
bc7259a2 | 28 | #include <linux/bitrev.h> |
8a27f7c9 | 29 | #include <net/addrconf.h> |
1da177e4 | 30 | |
4e57b681 | 31 | #include <asm/page.h> /* for PAGE_SIZE */ |
1da177e4 | 32 | #include <asm/div64.h> |
deac93df | 33 | #include <asm/sections.h> /* for dereference_function_descriptor() */ |
1da177e4 | 34 | |
9b706aee DV |
35 | /* Works only for digits and letters, but small and fast */ |
36 | #define TOLOWER(x) ((x) | 0x20) | |
37 | ||
aa46a63e HH |
38 | static unsigned int simple_guess_base(const char *cp) |
39 | { | |
40 | if (cp[0] == '0') { | |
41 | if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2])) | |
42 | return 16; | |
43 | else | |
44 | return 8; | |
45 | } else { | |
46 | return 10; | |
47 | } | |
48 | } | |
49 | ||
1da177e4 | 50 | /** |
922ac25c | 51 | * simple_strtoull - convert a string to an unsigned long long |
1da177e4 LT |
52 | * @cp: The start of the string |
53 | * @endp: A pointer to the end of the parsed string will be placed here | |
54 | * @base: The number base to use | |
55 | */ | |
922ac25c | 56 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
1da177e4 | 57 | { |
922ac25c | 58 | unsigned long long result = 0; |
aa46a63e HH |
59 | |
60 | if (!base) | |
61 | base = simple_guess_base(cp); | |
62 | ||
63 | if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x') | |
64 | cp += 2; | |
65 | ||
66 | while (isxdigit(*cp)) { | |
67 | unsigned int value; | |
68 | ||
69 | value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10; | |
70 | if (value >= base) | |
71 | break; | |
72 | result = result * base + value; | |
1da177e4 LT |
73 | cp++; |
74 | } | |
75 | if (endp) | |
76 | *endp = (char *)cp; | |
7b9186f5 | 77 | |
1da177e4 LT |
78 | return result; |
79 | } | |
922ac25c | 80 | EXPORT_SYMBOL(simple_strtoull); |
1da177e4 LT |
81 | |
82 | /** | |
922ac25c | 83 | * simple_strtoul - convert a string to an unsigned long |
1da177e4 LT |
84 | * @cp: The start of the string |
85 | * @endp: A pointer to the end of the parsed string will be placed here | |
86 | * @base: The number base to use | |
87 | */ | |
922ac25c | 88 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
1da177e4 | 89 | { |
922ac25c | 90 | return simple_strtoull(cp, endp, base); |
1da177e4 | 91 | } |
922ac25c | 92 | EXPORT_SYMBOL(simple_strtoul); |
1da177e4 LT |
93 | |
94 | /** | |
922ac25c | 95 | * simple_strtol - convert a string to a signed long |
1da177e4 LT |
96 | * @cp: The start of the string |
97 | * @endp: A pointer to the end of the parsed string will be placed here | |
98 | * @base: The number base to use | |
99 | */ | |
922ac25c | 100 | long simple_strtol(const char *cp, char **endp, unsigned int base) |
1da177e4 | 101 | { |
922ac25c AGR |
102 | if (*cp == '-') |
103 | return -simple_strtoul(cp + 1, endp, base); | |
7b9186f5 | 104 | |
922ac25c | 105 | return simple_strtoul(cp, endp, base); |
1da177e4 | 106 | } |
922ac25c | 107 | EXPORT_SYMBOL(simple_strtol); |
1da177e4 LT |
108 | |
109 | /** | |
110 | * simple_strtoll - convert a string to a signed long long | |
111 | * @cp: The start of the string | |
112 | * @endp: A pointer to the end of the parsed string will be placed here | |
113 | * @base: The number base to use | |
114 | */ | |
22d27051 | 115 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
1da177e4 | 116 | { |
7b9186f5 | 117 | if (*cp == '-') |
22d27051 | 118 | return -simple_strtoull(cp + 1, endp, base); |
7b9186f5 | 119 | |
22d27051 | 120 | return simple_strtoull(cp, endp, base); |
1da177e4 LT |
121 | } |
122 | ||
06b2a76d YY |
123 | /** |
124 | * strict_strtoul - convert a string to an unsigned long strictly | |
125 | * @cp: The string to be converted | |
126 | * @base: The number base to use | |
127 | * @res: The converted result value | |
128 | * | |
129 | * strict_strtoul converts a string to an unsigned long only if the | |
130 | * string is really an unsigned long string, any string containing | |
131 | * any invalid char at the tail will be rejected and -EINVAL is returned, | |
132 | * only a newline char at the tail is acceptible because people generally | |
133 | * change a module parameter in the following way: | |
134 | * | |
135 | * echo 1024 > /sys/module/e1000/parameters/copybreak | |
136 | * | |
137 | * echo will append a newline to the tail. | |
138 | * | |
139 | * It returns 0 if conversion is successful and *res is set to the converted | |
140 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
141 | * | |
142 | * simple_strtoul just ignores the successive invalid characters and | |
143 | * return the converted value of prefix part of the string. | |
144 | */ | |
9d85db22 HH |
145 | int strict_strtoul(const char *cp, unsigned int base, unsigned long *res) |
146 | { | |
147 | char *tail; | |
148 | unsigned long val; | |
149 | size_t len; | |
150 | ||
151 | *res = 0; | |
152 | len = strlen(cp); | |
153 | if (len == 0) | |
154 | return -EINVAL; | |
155 | ||
156 | val = simple_strtoul(cp, &tail, base); | |
e899aa82 PM |
157 | if (tail == cp) |
158 | return -EINVAL; | |
7b9186f5 | 159 | |
9d85db22 HH |
160 | if ((*tail == '\0') || |
161 | ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) { | |
162 | *res = val; | |
163 | return 0; | |
164 | } | |
165 | ||
166 | return -EINVAL; | |
167 | } | |
168 | EXPORT_SYMBOL(strict_strtoul); | |
06b2a76d YY |
169 | |
170 | /** | |
171 | * strict_strtol - convert a string to a long strictly | |
172 | * @cp: The string to be converted | |
173 | * @base: The number base to use | |
174 | * @res: The converted result value | |
175 | * | |
176 | * strict_strtol is similiar to strict_strtoul, but it allows the first | |
177 | * character of a string is '-'. | |
178 | * | |
179 | * It returns 0 if conversion is successful and *res is set to the converted | |
180 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
181 | */ | |
9d85db22 HH |
182 | int strict_strtol(const char *cp, unsigned int base, long *res) |
183 | { | |
184 | int ret; | |
185 | if (*cp == '-') { | |
186 | ret = strict_strtoul(cp + 1, base, (unsigned long *)res); | |
187 | if (!ret) | |
188 | *res = -(*res); | |
189 | } else { | |
190 | ret = strict_strtoul(cp, base, (unsigned long *)res); | |
191 | } | |
192 | ||
193 | return ret; | |
194 | } | |
195 | EXPORT_SYMBOL(strict_strtol); | |
06b2a76d YY |
196 | |
197 | /** | |
198 | * strict_strtoull - convert a string to an unsigned long long strictly | |
199 | * @cp: The string to be converted | |
200 | * @base: The number base to use | |
201 | * @res: The converted result value | |
202 | * | |
203 | * strict_strtoull converts a string to an unsigned long long only if the | |
204 | * string is really an unsigned long long string, any string containing | |
205 | * any invalid char at the tail will be rejected and -EINVAL is returned, | |
206 | * only a newline char at the tail is acceptible because people generally | |
207 | * change a module parameter in the following way: | |
208 | * | |
209 | * echo 1024 > /sys/module/e1000/parameters/copybreak | |
210 | * | |
211 | * echo will append a newline to the tail of the string. | |
212 | * | |
213 | * It returns 0 if conversion is successful and *res is set to the converted | |
214 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
215 | * | |
216 | * simple_strtoull just ignores the successive invalid characters and | |
217 | * return the converted value of prefix part of the string. | |
218 | */ | |
9d85db22 HH |
219 | int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res) |
220 | { | |
221 | char *tail; | |
222 | unsigned long long val; | |
223 | size_t len; | |
224 | ||
225 | *res = 0; | |
226 | len = strlen(cp); | |
227 | if (len == 0) | |
228 | return -EINVAL; | |
229 | ||
230 | val = simple_strtoull(cp, &tail, base); | |
e899aa82 PM |
231 | if (tail == cp) |
232 | return -EINVAL; | |
9d85db22 HH |
233 | if ((*tail == '\0') || |
234 | ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) { | |
235 | *res = val; | |
236 | return 0; | |
237 | } | |
238 | ||
239 | return -EINVAL; | |
240 | } | |
241 | EXPORT_SYMBOL(strict_strtoull); | |
06b2a76d YY |
242 | |
243 | /** | |
244 | * strict_strtoll - convert a string to a long long strictly | |
245 | * @cp: The string to be converted | |
246 | * @base: The number base to use | |
247 | * @res: The converted result value | |
248 | * | |
249 | * strict_strtoll is similiar to strict_strtoull, but it allows the first | |
250 | * character of a string is '-'. | |
251 | * | |
252 | * It returns 0 if conversion is successful and *res is set to the converted | |
253 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
254 | */ | |
9d85db22 HH |
255 | int strict_strtoll(const char *cp, unsigned int base, long long *res) |
256 | { | |
257 | int ret; | |
258 | if (*cp == '-') { | |
259 | ret = strict_strtoull(cp + 1, base, (unsigned long long *)res); | |
260 | if (!ret) | |
261 | *res = -(*res); | |
262 | } else { | |
263 | ret = strict_strtoull(cp, base, (unsigned long long *)res); | |
264 | } | |
06b2a76d | 265 | |
9d85db22 HH |
266 | return ret; |
267 | } | |
06b2a76d | 268 | EXPORT_SYMBOL(strict_strtoll); |
06b2a76d | 269 | |
1da177e4 LT |
270 | static int skip_atoi(const char **s) |
271 | { | |
7b9186f5 | 272 | int i = 0; |
1da177e4 LT |
273 | |
274 | while (isdigit(**s)) | |
275 | i = i*10 + *((*s)++) - '0'; | |
7b9186f5 | 276 | |
1da177e4 LT |
277 | return i; |
278 | } | |
279 | ||
4277eedd DV |
280 | /* Decimal conversion is by far the most typical, and is used |
281 | * for /proc and /sys data. This directly impacts e.g. top performance | |
282 | * with many processes running. We optimize it for speed | |
283 | * using code from | |
284 | * http://www.cs.uiowa.edu/~jones/bcd/decimal.html | |
285 | * (with permission from the author, Douglas W. Jones). */ | |
286 | ||
287 | /* Formats correctly any integer in [0,99999]. | |
288 | * Outputs from one to five digits depending on input. | |
289 | * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */ | |
7b9186f5 | 290 | static char *put_dec_trunc(char *buf, unsigned q) |
4277eedd DV |
291 | { |
292 | unsigned d3, d2, d1, d0; | |
293 | d1 = (q>>4) & 0xf; | |
294 | d2 = (q>>8) & 0xf; | |
295 | d3 = (q>>12); | |
296 | ||
297 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); | |
298 | q = (d0 * 0xcd) >> 11; | |
299 | d0 = d0 - 10*q; | |
300 | *buf++ = d0 + '0'; /* least significant digit */ | |
301 | d1 = q + 9*d3 + 5*d2 + d1; | |
302 | if (d1 != 0) { | |
303 | q = (d1 * 0xcd) >> 11; | |
304 | d1 = d1 - 10*q; | |
305 | *buf++ = d1 + '0'; /* next digit */ | |
306 | ||
307 | d2 = q + 2*d2; | |
308 | if ((d2 != 0) || (d3 != 0)) { | |
309 | q = (d2 * 0xd) >> 7; | |
310 | d2 = d2 - 10*q; | |
311 | *buf++ = d2 + '0'; /* next digit */ | |
312 | ||
313 | d3 = q + 4*d3; | |
314 | if (d3 != 0) { | |
315 | q = (d3 * 0xcd) >> 11; | |
316 | d3 = d3 - 10*q; | |
317 | *buf++ = d3 + '0'; /* next digit */ | |
318 | if (q != 0) | |
7b9186f5 | 319 | *buf++ = q + '0'; /* most sign. digit */ |
4277eedd DV |
320 | } |
321 | } | |
322 | } | |
7b9186f5 | 323 | |
4277eedd DV |
324 | return buf; |
325 | } | |
326 | /* Same with if's removed. Always emits five digits */ | |
7b9186f5 | 327 | static char *put_dec_full(char *buf, unsigned q) |
4277eedd DV |
328 | { |
329 | /* BTW, if q is in [0,9999], 8-bit ints will be enough, */ | |
330 | /* but anyway, gcc produces better code with full-sized ints */ | |
331 | unsigned d3, d2, d1, d0; | |
332 | d1 = (q>>4) & 0xf; | |
333 | d2 = (q>>8) & 0xf; | |
334 | d3 = (q>>12); | |
335 | ||
7b9186f5 AGR |
336 | /* |
337 | * Possible ways to approx. divide by 10 | |
338 | * gcc -O2 replaces multiply with shifts and adds | |
339 | * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386) | |
340 | * (x * 0x67) >> 10: 1100111 | |
341 | * (x * 0x34) >> 9: 110100 - same | |
342 | * (x * 0x1a) >> 8: 11010 - same | |
343 | * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386) | |
344 | */ | |
4277eedd DV |
345 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); |
346 | q = (d0 * 0xcd) >> 11; | |
347 | d0 = d0 - 10*q; | |
348 | *buf++ = d0 + '0'; | |
349 | d1 = q + 9*d3 + 5*d2 + d1; | |
350 | q = (d1 * 0xcd) >> 11; | |
351 | d1 = d1 - 10*q; | |
352 | *buf++ = d1 + '0'; | |
353 | ||
354 | d2 = q + 2*d2; | |
355 | q = (d2 * 0xd) >> 7; | |
356 | d2 = d2 - 10*q; | |
357 | *buf++ = d2 + '0'; | |
358 | ||
359 | d3 = q + 4*d3; | |
360 | q = (d3 * 0xcd) >> 11; /* - shorter code */ | |
361 | /* q = (d3 * 0x67) >> 10; - would also work */ | |
362 | d3 = d3 - 10*q; | |
363 | *buf++ = d3 + '0'; | |
364 | *buf++ = q + '0'; | |
7b9186f5 | 365 | |
4277eedd DV |
366 | return buf; |
367 | } | |
368 | /* No inlining helps gcc to use registers better */ | |
7b9186f5 | 369 | static noinline char *put_dec(char *buf, unsigned long long num) |
4277eedd DV |
370 | { |
371 | while (1) { | |
372 | unsigned rem; | |
373 | if (num < 100000) | |
374 | return put_dec_trunc(buf, num); | |
375 | rem = do_div(num, 100000); | |
376 | buf = put_dec_full(buf, rem); | |
377 | } | |
378 | } | |
379 | ||
1da177e4 LT |
380 | #define ZEROPAD 1 /* pad with zero */ |
381 | #define SIGN 2 /* unsigned/signed long */ | |
382 | #define PLUS 4 /* show plus */ | |
383 | #define SPACE 8 /* space if plus */ | |
384 | #define LEFT 16 /* left justified */ | |
9b706aee DV |
385 | #define SMALL 32 /* Must be 32 == 0x20 */ |
386 | #define SPECIAL 64 /* 0x */ | |
1da177e4 | 387 | |
fef20d9c FW |
388 | enum format_type { |
389 | FORMAT_TYPE_NONE, /* Just a string part */ | |
ed681a91 | 390 | FORMAT_TYPE_WIDTH, |
fef20d9c FW |
391 | FORMAT_TYPE_PRECISION, |
392 | FORMAT_TYPE_CHAR, | |
393 | FORMAT_TYPE_STR, | |
394 | FORMAT_TYPE_PTR, | |
395 | FORMAT_TYPE_PERCENT_CHAR, | |
396 | FORMAT_TYPE_INVALID, | |
397 | FORMAT_TYPE_LONG_LONG, | |
398 | FORMAT_TYPE_ULONG, | |
399 | FORMAT_TYPE_LONG, | |
a4e94ef0 Z |
400 | FORMAT_TYPE_UBYTE, |
401 | FORMAT_TYPE_BYTE, | |
fef20d9c FW |
402 | FORMAT_TYPE_USHORT, |
403 | FORMAT_TYPE_SHORT, | |
404 | FORMAT_TYPE_UINT, | |
405 | FORMAT_TYPE_INT, | |
406 | FORMAT_TYPE_NRCHARS, | |
407 | FORMAT_TYPE_SIZE_T, | |
408 | FORMAT_TYPE_PTRDIFF | |
409 | }; | |
410 | ||
411 | struct printf_spec { | |
412 | enum format_type type; | |
413 | int flags; /* flags to number() */ | |
414 | int field_width; /* width of output field */ | |
415 | int base; | |
416 | int precision; /* # of digits/chars */ | |
417 | int qualifier; | |
418 | }; | |
419 | ||
420 | static char *number(char *buf, char *end, unsigned long long num, | |
421 | struct printf_spec spec) | |
1da177e4 | 422 | { |
9b706aee DV |
423 | /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ |
424 | static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ | |
425 | ||
426 | char tmp[66]; | |
427 | char sign; | |
428 | char locase; | |
fef20d9c | 429 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
1da177e4 LT |
430 | int i; |
431 | ||
9b706aee DV |
432 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
433 | * produces same digits or (maybe lowercased) letters */ | |
fef20d9c FW |
434 | locase = (spec.flags & SMALL); |
435 | if (spec.flags & LEFT) | |
436 | spec.flags &= ~ZEROPAD; | |
1da177e4 | 437 | sign = 0; |
fef20d9c | 438 | if (spec.flags & SIGN) { |
7b9186f5 | 439 | if ((signed long long)num < 0) { |
1da177e4 | 440 | sign = '-'; |
7b9186f5 | 441 | num = -(signed long long)num; |
fef20d9c FW |
442 | spec.field_width--; |
443 | } else if (spec.flags & PLUS) { | |
1da177e4 | 444 | sign = '+'; |
fef20d9c FW |
445 | spec.field_width--; |
446 | } else if (spec.flags & SPACE) { | |
1da177e4 | 447 | sign = ' '; |
fef20d9c | 448 | spec.field_width--; |
1da177e4 LT |
449 | } |
450 | } | |
b39a7340 | 451 | if (need_pfx) { |
fef20d9c FW |
452 | spec.field_width--; |
453 | if (spec.base == 16) | |
454 | spec.field_width--; | |
1da177e4 | 455 | } |
b39a7340 DV |
456 | |
457 | /* generate full string in tmp[], in reverse order */ | |
1da177e4 LT |
458 | i = 0; |
459 | if (num == 0) | |
b39a7340 | 460 | tmp[i++] = '0'; |
4277eedd DV |
461 | /* Generic code, for any base: |
462 | else do { | |
9b706aee | 463 | tmp[i++] = (digits[do_div(num,base)] | locase); |
4277eedd DV |
464 | } while (num != 0); |
465 | */ | |
fef20d9c FW |
466 | else if (spec.base != 10) { /* 8 or 16 */ |
467 | int mask = spec.base - 1; | |
b39a7340 | 468 | int shift = 3; |
7b9186f5 AGR |
469 | |
470 | if (spec.base == 16) | |
471 | shift = 4; | |
b39a7340 | 472 | do { |
9b706aee | 473 | tmp[i++] = (digits[((unsigned char)num) & mask] | locase); |
b39a7340 DV |
474 | num >>= shift; |
475 | } while (num); | |
4277eedd DV |
476 | } else { /* base 10 */ |
477 | i = put_dec(tmp, num) - tmp; | |
478 | } | |
b39a7340 DV |
479 | |
480 | /* printing 100 using %2d gives "100", not "00" */ | |
fef20d9c FW |
481 | if (i > spec.precision) |
482 | spec.precision = i; | |
b39a7340 | 483 | /* leading space padding */ |
fef20d9c FW |
484 | spec.field_width -= spec.precision; |
485 | if (!(spec.flags & (ZEROPAD+LEFT))) { | |
7b9186f5 | 486 | while (--spec.field_width >= 0) { |
f796937a | 487 | if (buf < end) |
1da177e4 LT |
488 | *buf = ' '; |
489 | ++buf; | |
490 | } | |
491 | } | |
b39a7340 | 492 | /* sign */ |
1da177e4 | 493 | if (sign) { |
f796937a | 494 | if (buf < end) |
1da177e4 LT |
495 | *buf = sign; |
496 | ++buf; | |
497 | } | |
b39a7340 DV |
498 | /* "0x" / "0" prefix */ |
499 | if (need_pfx) { | |
500 | if (buf < end) | |
501 | *buf = '0'; | |
502 | ++buf; | |
fef20d9c | 503 | if (spec.base == 16) { |
f796937a | 504 | if (buf < end) |
9b706aee | 505 | *buf = ('X' | locase); |
1da177e4 LT |
506 | ++buf; |
507 | } | |
508 | } | |
b39a7340 | 509 | /* zero or space padding */ |
fef20d9c FW |
510 | if (!(spec.flags & LEFT)) { |
511 | char c = (spec.flags & ZEROPAD) ? '0' : ' '; | |
512 | while (--spec.field_width >= 0) { | |
f796937a | 513 | if (buf < end) |
1da177e4 LT |
514 | *buf = c; |
515 | ++buf; | |
516 | } | |
517 | } | |
b39a7340 | 518 | /* hmm even more zero padding? */ |
fef20d9c | 519 | while (i <= --spec.precision) { |
f796937a | 520 | if (buf < end) |
1da177e4 LT |
521 | *buf = '0'; |
522 | ++buf; | |
523 | } | |
b39a7340 DV |
524 | /* actual digits of result */ |
525 | while (--i >= 0) { | |
f796937a | 526 | if (buf < end) |
1da177e4 LT |
527 | *buf = tmp[i]; |
528 | ++buf; | |
529 | } | |
b39a7340 | 530 | /* trailing space padding */ |
fef20d9c | 531 | while (--spec.field_width >= 0) { |
f796937a | 532 | if (buf < end) |
1da177e4 LT |
533 | *buf = ' '; |
534 | ++buf; | |
535 | } | |
7b9186f5 | 536 | |
1da177e4 LT |
537 | return buf; |
538 | } | |
539 | ||
0f4f81dc | 540 | static char *string(char *buf, char *end, const char *s, struct printf_spec spec) |
0f9bfa56 LT |
541 | { |
542 | int len, i; | |
543 | ||
544 | if ((unsigned long)s < PAGE_SIZE) | |
0f4f81dc | 545 | s = "(null)"; |
0f9bfa56 | 546 | |
fef20d9c | 547 | len = strnlen(s, spec.precision); |
0f9bfa56 | 548 | |
fef20d9c FW |
549 | if (!(spec.flags & LEFT)) { |
550 | while (len < spec.field_width--) { | |
0f9bfa56 LT |
551 | if (buf < end) |
552 | *buf = ' '; | |
553 | ++buf; | |
554 | } | |
555 | } | |
556 | for (i = 0; i < len; ++i) { | |
557 | if (buf < end) | |
558 | *buf = *s; | |
559 | ++buf; ++s; | |
560 | } | |
fef20d9c | 561 | while (len < spec.field_width--) { |
0f9bfa56 LT |
562 | if (buf < end) |
563 | *buf = ' '; | |
564 | ++buf; | |
565 | } | |
7b9186f5 | 566 | |
0f9bfa56 LT |
567 | return buf; |
568 | } | |
569 | ||
fef20d9c | 570 | static char *symbol_string(char *buf, char *end, void *ptr, |
0c8b946e | 571 | struct printf_spec spec, char ext) |
0fe1ef24 LT |
572 | { |
573 | unsigned long value = (unsigned long) ptr; | |
574 | #ifdef CONFIG_KALLSYMS | |
575 | char sym[KSYM_SYMBOL_LEN]; | |
91adcd2c | 576 | if (ext != 'f' && ext != 's') |
0c8b946e FW |
577 | sprint_symbol(sym, value); |
578 | else | |
579 | kallsyms_lookup(value, NULL, NULL, NULL, sym); | |
7b9186f5 | 580 | |
fef20d9c | 581 | return string(buf, end, sym, spec); |
0fe1ef24 | 582 | #else |
7b9186f5 | 583 | spec.field_width = 2 * sizeof(void *); |
fef20d9c FW |
584 | spec.flags |= SPECIAL | SMALL | ZEROPAD; |
585 | spec.base = 16; | |
7b9186f5 | 586 | |
fef20d9c | 587 | return number(buf, end, value, spec); |
0fe1ef24 LT |
588 | #endif |
589 | } | |
590 | ||
fef20d9c | 591 | static char *resource_string(char *buf, char *end, struct resource *res, |
fd95541e | 592 | struct printf_spec spec, const char *fmt) |
332d2e78 LT |
593 | { |
594 | #ifndef IO_RSRC_PRINTK_SIZE | |
28405372 | 595 | #define IO_RSRC_PRINTK_SIZE 6 |
332d2e78 LT |
596 | #endif |
597 | ||
598 | #ifndef MEM_RSRC_PRINTK_SIZE | |
28405372 | 599 | #define MEM_RSRC_PRINTK_SIZE 10 |
332d2e78 | 600 | #endif |
c91d3376 | 601 | struct printf_spec hex_spec = { |
fef20d9c FW |
602 | .base = 16, |
603 | .precision = -1, | |
604 | .flags = SPECIAL | SMALL | ZEROPAD, | |
605 | }; | |
c91d3376 BH |
606 | struct printf_spec dec_spec = { |
607 | .base = 10, | |
608 | .precision = -1, | |
609 | .flags = 0, | |
610 | }; | |
fd95541e BH |
611 | struct printf_spec str_spec = { |
612 | .field_width = -1, | |
613 | .precision = 10, | |
614 | .flags = LEFT, | |
615 | }; | |
616 | struct printf_spec flag_spec = { | |
617 | .base = 16, | |
618 | .precision = -1, | |
619 | .flags = SPECIAL | SMALL, | |
620 | }; | |
c7dabef8 BH |
621 | |
622 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) | |
623 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ | |
624 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) | |
625 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) | |
626 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref disabled]") | |
627 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") | |
628 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, | |
629 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; | |
630 | ||
332d2e78 | 631 | char *p = sym, *pend = sym + sizeof(sym); |
c91d3376 | 632 | int size = -1, addr = 0; |
c7dabef8 | 633 | int decode = (fmt[0] == 'R') ? 1 : 0; |
332d2e78 | 634 | |
c91d3376 | 635 | if (res->flags & IORESOURCE_IO) { |
332d2e78 | 636 | size = IO_RSRC_PRINTK_SIZE; |
c91d3376 BH |
637 | addr = 1; |
638 | } else if (res->flags & IORESOURCE_MEM) { | |
332d2e78 | 639 | size = MEM_RSRC_PRINTK_SIZE; |
c91d3376 BH |
640 | addr = 1; |
641 | } | |
332d2e78 LT |
642 | |
643 | *p++ = '['; | |
c7dabef8 BH |
644 | if (res->flags & IORESOURCE_IO) |
645 | p = string(p, pend, "io ", str_spec); | |
646 | else if (res->flags & IORESOURCE_MEM) | |
647 | p = string(p, pend, "mem ", str_spec); | |
648 | else if (res->flags & IORESOURCE_IRQ) | |
649 | p = string(p, pend, "irq ", str_spec); | |
650 | else if (res->flags & IORESOURCE_DMA) | |
651 | p = string(p, pend, "dma ", str_spec); | |
652 | else { | |
653 | p = string(p, pend, "??? ", str_spec); | |
654 | decode = 0; | |
fd95541e | 655 | } |
c91d3376 BH |
656 | hex_spec.field_width = size; |
657 | p = number(p, pend, res->start, addr ? hex_spec : dec_spec); | |
658 | if (res->start != res->end) { | |
659 | *p++ = '-'; | |
660 | p = number(p, pend, res->end, addr ? hex_spec : dec_spec); | |
661 | } | |
c7dabef8 | 662 | if (decode) { |
fd95541e BH |
663 | if (res->flags & IORESOURCE_MEM_64) |
664 | p = string(p, pend, " 64bit", str_spec); | |
665 | if (res->flags & IORESOURCE_PREFETCH) | |
666 | p = string(p, pend, " pref", str_spec); | |
667 | if (res->flags & IORESOURCE_DISABLED) | |
668 | p = string(p, pend, " disabled", str_spec); | |
c7dabef8 BH |
669 | } else { |
670 | p = string(p, pend, " flags ", str_spec); | |
671 | p = number(p, pend, res->flags, flag_spec); | |
fd95541e | 672 | } |
332d2e78 | 673 | *p++ = ']'; |
c7dabef8 | 674 | *p = '\0'; |
332d2e78 | 675 | |
fef20d9c | 676 | return string(buf, end, sym, spec); |
332d2e78 LT |
677 | } |
678 | ||
fef20d9c | 679 | static char *mac_address_string(char *buf, char *end, u8 *addr, |
8a27f7c9 | 680 | struct printf_spec spec, const char *fmt) |
dd45c9cf | 681 | { |
8a27f7c9 | 682 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; |
dd45c9cf HH |
683 | char *p = mac_addr; |
684 | int i; | |
bc7259a2 JP |
685 | bool bitrev; |
686 | char separator; | |
687 | ||
688 | if (fmt[1] == 'F') { /* FDDI canonical format */ | |
689 | bitrev = true; | |
690 | separator = '-'; | |
691 | } else { | |
692 | bitrev = false; | |
693 | separator = ':'; | |
694 | } | |
dd45c9cf HH |
695 | |
696 | for (i = 0; i < 6; i++) { | |
bc7259a2 | 697 | p = pack_hex_byte(p, bitrev ? bitrev8(addr[i]) : addr[i]); |
8a27f7c9 | 698 | if (fmt[0] == 'M' && i != 5) |
bc7259a2 | 699 | *p++ = separator; |
dd45c9cf HH |
700 | } |
701 | *p = '\0'; | |
702 | ||
fef20d9c | 703 | return string(buf, end, mac_addr, spec); |
dd45c9cf HH |
704 | } |
705 | ||
8a27f7c9 JP |
706 | static char *ip4_string(char *p, const u8 *addr, bool leading_zeros) |
707 | { | |
708 | int i; | |
709 | ||
710 | for (i = 0; i < 4; i++) { | |
711 | char temp[3]; /* hold each IP quad in reverse order */ | |
712 | int digits = put_dec_trunc(temp, addr[i]) - temp; | |
713 | if (leading_zeros) { | |
714 | if (digits < 3) | |
715 | *p++ = '0'; | |
716 | if (digits < 2) | |
717 | *p++ = '0'; | |
718 | } | |
719 | /* reverse the digits in the quad */ | |
720 | while (digits--) | |
721 | *p++ = temp[digits]; | |
722 | if (i < 3) | |
723 | *p++ = '.'; | |
724 | } | |
8a27f7c9 | 725 | *p = '\0'; |
7b9186f5 | 726 | |
8a27f7c9 JP |
727 | return p; |
728 | } | |
729 | ||
eb78cd26 | 730 | static char *ip6_compressed_string(char *p, const char *addr) |
689afa7d | 731 | { |
7b9186f5 | 732 | int i, j, range; |
8a27f7c9 JP |
733 | unsigned char zerolength[8]; |
734 | int longest = 1; | |
735 | int colonpos = -1; | |
736 | u16 word; | |
7b9186f5 | 737 | u8 hi, lo; |
8a27f7c9 | 738 | bool needcolon = false; |
eb78cd26 JP |
739 | bool useIPv4; |
740 | struct in6_addr in6; | |
741 | ||
742 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
743 | ||
744 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
8a27f7c9 JP |
745 | |
746 | memset(zerolength, 0, sizeof(zerolength)); | |
747 | ||
748 | if (useIPv4) | |
749 | range = 6; | |
750 | else | |
751 | range = 8; | |
752 | ||
753 | /* find position of longest 0 run */ | |
754 | for (i = 0; i < range; i++) { | |
755 | for (j = i; j < range; j++) { | |
eb78cd26 | 756 | if (in6.s6_addr16[j] != 0) |
8a27f7c9 JP |
757 | break; |
758 | zerolength[i]++; | |
759 | } | |
760 | } | |
761 | for (i = 0; i < range; i++) { | |
762 | if (zerolength[i] > longest) { | |
763 | longest = zerolength[i]; | |
764 | colonpos = i; | |
765 | } | |
766 | } | |
689afa7d | 767 | |
8a27f7c9 JP |
768 | /* emit address */ |
769 | for (i = 0; i < range; i++) { | |
770 | if (i == colonpos) { | |
771 | if (needcolon || i == 0) | |
772 | *p++ = ':'; | |
773 | *p++ = ':'; | |
774 | needcolon = false; | |
775 | i += longest - 1; | |
776 | continue; | |
777 | } | |
778 | if (needcolon) { | |
779 | *p++ = ':'; | |
780 | needcolon = false; | |
781 | } | |
782 | /* hex u16 without leading 0s */ | |
eb78cd26 | 783 | word = ntohs(in6.s6_addr16[i]); |
8a27f7c9 JP |
784 | hi = word >> 8; |
785 | lo = word & 0xff; | |
786 | if (hi) { | |
787 | if (hi > 0x0f) | |
788 | p = pack_hex_byte(p, hi); | |
789 | else | |
790 | *p++ = hex_asc_lo(hi); | |
b5ff992b | 791 | p = pack_hex_byte(p, lo); |
8a27f7c9 | 792 | } |
b5ff992b | 793 | else if (lo > 0x0f) |
8a27f7c9 JP |
794 | p = pack_hex_byte(p, lo); |
795 | else | |
796 | *p++ = hex_asc_lo(lo); | |
797 | needcolon = true; | |
798 | } | |
799 | ||
800 | if (useIPv4) { | |
801 | if (needcolon) | |
802 | *p++ = ':'; | |
eb78cd26 | 803 | p = ip4_string(p, &in6.s6_addr[12], false); |
8a27f7c9 | 804 | } |
8a27f7c9 | 805 | *p = '\0'; |
7b9186f5 | 806 | |
8a27f7c9 JP |
807 | return p; |
808 | } | |
809 | ||
eb78cd26 | 810 | static char *ip6_string(char *p, const char *addr, const char *fmt) |
8a27f7c9 JP |
811 | { |
812 | int i; | |
7b9186f5 | 813 | |
689afa7d | 814 | for (i = 0; i < 8; i++) { |
eb78cd26 JP |
815 | p = pack_hex_byte(p, *addr++); |
816 | p = pack_hex_byte(p, *addr++); | |
8a27f7c9 | 817 | if (fmt[0] == 'I' && i != 7) |
689afa7d HH |
818 | *p++ = ':'; |
819 | } | |
820 | *p = '\0'; | |
7b9186f5 | 821 | |
8a27f7c9 JP |
822 | return p; |
823 | } | |
824 | ||
825 | static char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
826 | struct printf_spec spec, const char *fmt) | |
827 | { | |
828 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
829 | ||
830 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
eb78cd26 | 831 | ip6_compressed_string(ip6_addr, addr); |
8a27f7c9 | 832 | else |
eb78cd26 | 833 | ip6_string(ip6_addr, addr, fmt); |
689afa7d | 834 | |
fef20d9c | 835 | return string(buf, end, ip6_addr, spec); |
689afa7d HH |
836 | } |
837 | ||
8a27f7c9 JP |
838 | static char *ip4_addr_string(char *buf, char *end, const u8 *addr, |
839 | struct printf_spec spec, const char *fmt) | |
4aa99606 | 840 | { |
8a27f7c9 | 841 | char ip4_addr[sizeof("255.255.255.255")]; |
4aa99606 | 842 | |
8a27f7c9 | 843 | ip4_string(ip4_addr, addr, fmt[0] == 'i'); |
4aa99606 | 844 | |
fef20d9c | 845 | return string(buf, end, ip4_addr, spec); |
4aa99606 HH |
846 | } |
847 | ||
9ac6e44e JP |
848 | static char *uuid_string(char *buf, char *end, const u8 *addr, |
849 | struct printf_spec spec, const char *fmt) | |
850 | { | |
851 | char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; | |
852 | char *p = uuid; | |
853 | int i; | |
854 | static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; | |
855 | static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; | |
856 | const u8 *index = be; | |
857 | bool uc = false; | |
858 | ||
859 | switch (*(++fmt)) { | |
860 | case 'L': | |
861 | uc = true; /* fall-through */ | |
862 | case 'l': | |
863 | index = le; | |
864 | break; | |
865 | case 'B': | |
866 | uc = true; | |
867 | break; | |
868 | } | |
869 | ||
870 | for (i = 0; i < 16; i++) { | |
871 | p = pack_hex_byte(p, addr[index[i]]); | |
872 | switch (i) { | |
873 | case 3: | |
874 | case 5: | |
875 | case 7: | |
876 | case 9: | |
877 | *p++ = '-'; | |
878 | break; | |
879 | } | |
880 | } | |
881 | ||
882 | *p = 0; | |
883 | ||
884 | if (uc) { | |
885 | p = uuid; | |
886 | do { | |
887 | *p = toupper(*p); | |
888 | } while (*(++p)); | |
889 | } | |
890 | ||
891 | return string(buf, end, uuid, spec); | |
892 | } | |
893 | ||
4d8a743c LT |
894 | /* |
895 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
896 | * by an extra set of alphanumeric characters that are extended format | |
897 | * specifiers. | |
898 | * | |
332d2e78 LT |
899 | * Right now we handle: |
900 | * | |
0c8b946e FW |
901 | * - 'F' For symbolic function descriptor pointers with offset |
902 | * - 'f' For simple symbolic function names without offset | |
0efb4d20 SR |
903 | * - 'S' For symbolic direct pointers with offset |
904 | * - 's' For symbolic direct pointers without offset | |
c7dabef8 BH |
905 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] |
906 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] | |
dd45c9cf HH |
907 | * - 'M' For a 6-byte MAC address, it prints the address in the |
908 | * usual colon-separated hex notation | |
8a27f7c9 | 909 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons |
bc7259a2 JP |
910 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address |
911 | * with a dash-separated hex notation with bit reversed bytes | |
912 | * - 'mF' For a 6-byte MAC FDDI address, it prints the address | |
913 | * in hex notation without separators with bit reversed bytes | |
8a27f7c9 JP |
914 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way |
915 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
916 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
917 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses | |
918 | * IPv6 omits the colons (01020304...0f) | |
919 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
920 | * - 'I6c' for IPv6 addresses printed as specified by | |
921 | * http://www.ietf.org/id/draft-kawamura-ipv6-text-representation-03.txt | |
9ac6e44e JP |
922 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form |
923 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" | |
924 | * Options for %pU are: | |
925 | * b big endian lower case hex (default) | |
926 | * B big endian UPPER case hex | |
927 | * l little endian lower case hex | |
928 | * L little endian UPPER case hex | |
929 | * big endian output byte order is: | |
930 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] | |
931 | * little endian output byte order is: | |
932 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] | |
933 | * | |
332d2e78 LT |
934 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 |
935 | * function pointers are really function descriptors, which contain a | |
936 | * pointer to the real address. | |
4d8a743c | 937 | */ |
fef20d9c FW |
938 | static char *pointer(const char *fmt, char *buf, char *end, void *ptr, |
939 | struct printf_spec spec) | |
78a8bf69 | 940 | { |
d97106ab | 941 | if (!ptr) |
fef20d9c | 942 | return string(buf, end, "(null)", spec); |
d97106ab | 943 | |
0fe1ef24 LT |
944 | switch (*fmt) { |
945 | case 'F': | |
0c8b946e | 946 | case 'f': |
0fe1ef24 LT |
947 | ptr = dereference_function_descriptor(ptr); |
948 | /* Fallthrough */ | |
949 | case 'S': | |
9ac6e44e | 950 | case 's': |
0c8b946e | 951 | return symbol_string(buf, end, ptr, spec, *fmt); |
332d2e78 | 952 | case 'R': |
c7dabef8 | 953 | case 'r': |
fd95541e | 954 | return resource_string(buf, end, ptr, spec, fmt); |
8a27f7c9 JP |
955 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
956 | case 'm': /* Contiguous: 000102030405 */ | |
bc7259a2 | 957 | /* [mM]F (FDDI, bit reversed) */ |
8a27f7c9 JP |
958 | return mac_address_string(buf, end, ptr, spec, fmt); |
959 | case 'I': /* Formatted IP supported | |
960 | * 4: 1.2.3.4 | |
961 | * 6: 0001:0203:...:0708 | |
962 | * 6c: 1::708 or 1::1.2.3.4 | |
963 | */ | |
964 | case 'i': /* Contiguous: | |
965 | * 4: 001.002.003.004 | |
966 | * 6: 000102...0f | |
967 | */ | |
968 | switch (fmt[1]) { | |
969 | case '6': | |
970 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
971 | case '4': | |
972 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
973 | } | |
fef20d9c | 974 | break; |
9ac6e44e JP |
975 | case 'U': |
976 | return uuid_string(buf, end, ptr, spec, fmt); | |
fef20d9c FW |
977 | } |
978 | spec.flags |= SMALL; | |
979 | if (spec.field_width == -1) { | |
980 | spec.field_width = 2*sizeof(void *); | |
981 | spec.flags |= ZEROPAD; | |
982 | } | |
983 | spec.base = 16; | |
984 | ||
985 | return number(buf, end, (unsigned long) ptr, spec); | |
986 | } | |
987 | ||
988 | /* | |
989 | * Helper function to decode printf style format. | |
990 | * Each call decode a token from the format and return the | |
991 | * number of characters read (or likely the delta where it wants | |
992 | * to go on the next call). | |
993 | * The decoded token is returned through the parameters | |
994 | * | |
995 | * 'h', 'l', or 'L' for integer fields | |
996 | * 'z' support added 23/7/1999 S.H. | |
997 | * 'z' changed to 'Z' --davidm 1/25/99 | |
998 | * 't' added for ptrdiff_t | |
999 | * | |
1000 | * @fmt: the format string | |
1001 | * @type of the token returned | |
1002 | * @flags: various flags such as +, -, # tokens.. | |
1003 | * @field_width: overwritten width | |
1004 | * @base: base of the number (octal, hex, ...) | |
1005 | * @precision: precision of a number | |
1006 | * @qualifier: qualifier of a number (long, size_t, ...) | |
1007 | */ | |
1008 | static int format_decode(const char *fmt, struct printf_spec *spec) | |
1009 | { | |
1010 | const char *start = fmt; | |
fef20d9c FW |
1011 | |
1012 | /* we finished early by reading the field width */ | |
ed681a91 | 1013 | if (spec->type == FORMAT_TYPE_WIDTH) { |
fef20d9c FW |
1014 | if (spec->field_width < 0) { |
1015 | spec->field_width = -spec->field_width; | |
1016 | spec->flags |= LEFT; | |
1017 | } | |
1018 | spec->type = FORMAT_TYPE_NONE; | |
1019 | goto precision; | |
1020 | } | |
1021 | ||
1022 | /* we finished early by reading the precision */ | |
1023 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
1024 | if (spec->precision < 0) | |
1025 | spec->precision = 0; | |
1026 | ||
1027 | spec->type = FORMAT_TYPE_NONE; | |
1028 | goto qualifier; | |
1029 | } | |
1030 | ||
1031 | /* By default */ | |
1032 | spec->type = FORMAT_TYPE_NONE; | |
1033 | ||
1034 | for (; *fmt ; ++fmt) { | |
1035 | if (*fmt == '%') | |
1036 | break; | |
1037 | } | |
1038 | ||
1039 | /* Return the current non-format string */ | |
1040 | if (fmt != start || !*fmt) | |
1041 | return fmt - start; | |
1042 | ||
1043 | /* Process flags */ | |
1044 | spec->flags = 0; | |
1045 | ||
1046 | while (1) { /* this also skips first '%' */ | |
1047 | bool found = true; | |
1048 | ||
1049 | ++fmt; | |
1050 | ||
1051 | switch (*fmt) { | |
1052 | case '-': spec->flags |= LEFT; break; | |
1053 | case '+': spec->flags |= PLUS; break; | |
1054 | case ' ': spec->flags |= SPACE; break; | |
1055 | case '#': spec->flags |= SPECIAL; break; | |
1056 | case '0': spec->flags |= ZEROPAD; break; | |
1057 | default: found = false; | |
1058 | } | |
1059 | ||
1060 | if (!found) | |
1061 | break; | |
1062 | } | |
1063 | ||
1064 | /* get field width */ | |
1065 | spec->field_width = -1; | |
1066 | ||
1067 | if (isdigit(*fmt)) | |
1068 | spec->field_width = skip_atoi(&fmt); | |
1069 | else if (*fmt == '*') { | |
1070 | /* it's the next argument */ | |
ed681a91 | 1071 | spec->type = FORMAT_TYPE_WIDTH; |
fef20d9c FW |
1072 | return ++fmt - start; |
1073 | } | |
1074 | ||
1075 | precision: | |
1076 | /* get the precision */ | |
1077 | spec->precision = -1; | |
1078 | if (*fmt == '.') { | |
1079 | ++fmt; | |
1080 | if (isdigit(*fmt)) { | |
1081 | spec->precision = skip_atoi(&fmt); | |
1082 | if (spec->precision < 0) | |
1083 | spec->precision = 0; | |
1084 | } else if (*fmt == '*') { | |
1085 | /* it's the next argument */ | |
adf26f84 | 1086 | spec->type = FORMAT_TYPE_PRECISION; |
fef20d9c FW |
1087 | return ++fmt - start; |
1088 | } | |
1089 | } | |
1090 | ||
1091 | qualifier: | |
1092 | /* get the conversion qualifier */ | |
1093 | spec->qualifier = -1; | |
08562cb2 AGR |
1094 | if (*fmt == 'h' || TOLOWER(*fmt) == 'l' || |
1095 | TOLOWER(*fmt) == 'z' || *fmt == 't') { | |
a4e94ef0 Z |
1096 | spec->qualifier = *fmt++; |
1097 | if (unlikely(spec->qualifier == *fmt)) { | |
1098 | if (spec->qualifier == 'l') { | |
1099 | spec->qualifier = 'L'; | |
1100 | ++fmt; | |
1101 | } else if (spec->qualifier == 'h') { | |
1102 | spec->qualifier = 'H'; | |
1103 | ++fmt; | |
1104 | } | |
fef20d9c FW |
1105 | } |
1106 | } | |
1107 | ||
1108 | /* default base */ | |
1109 | spec->base = 10; | |
1110 | switch (*fmt) { | |
1111 | case 'c': | |
1112 | spec->type = FORMAT_TYPE_CHAR; | |
1113 | return ++fmt - start; | |
1114 | ||
1115 | case 's': | |
1116 | spec->type = FORMAT_TYPE_STR; | |
1117 | return ++fmt - start; | |
1118 | ||
1119 | case 'p': | |
1120 | spec->type = FORMAT_TYPE_PTR; | |
1121 | return fmt - start; | |
1122 | /* skip alnum */ | |
1123 | ||
1124 | case 'n': | |
1125 | spec->type = FORMAT_TYPE_NRCHARS; | |
1126 | return ++fmt - start; | |
1127 | ||
1128 | case '%': | |
1129 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
1130 | return ++fmt - start; | |
1131 | ||
1132 | /* integer number formats - set up the flags and "break" */ | |
1133 | case 'o': | |
1134 | spec->base = 8; | |
1135 | break; | |
1136 | ||
1137 | case 'x': | |
1138 | spec->flags |= SMALL; | |
1139 | ||
1140 | case 'X': | |
1141 | spec->base = 16; | |
1142 | break; | |
1143 | ||
1144 | case 'd': | |
1145 | case 'i': | |
39e874f8 | 1146 | spec->flags |= SIGN; |
fef20d9c | 1147 | case 'u': |
4aa99606 | 1148 | break; |
fef20d9c FW |
1149 | |
1150 | default: | |
1151 | spec->type = FORMAT_TYPE_INVALID; | |
1152 | return fmt - start; | |
0fe1ef24 | 1153 | } |
fef20d9c FW |
1154 | |
1155 | if (spec->qualifier == 'L') | |
1156 | spec->type = FORMAT_TYPE_LONG_LONG; | |
1157 | else if (spec->qualifier == 'l') { | |
39e874f8 | 1158 | if (spec->flags & SIGN) |
fef20d9c FW |
1159 | spec->type = FORMAT_TYPE_LONG; |
1160 | else | |
1161 | spec->type = FORMAT_TYPE_ULONG; | |
08562cb2 | 1162 | } else if (TOLOWER(spec->qualifier) == 'z') { |
fef20d9c FW |
1163 | spec->type = FORMAT_TYPE_SIZE_T; |
1164 | } else if (spec->qualifier == 't') { | |
1165 | spec->type = FORMAT_TYPE_PTRDIFF; | |
a4e94ef0 Z |
1166 | } else if (spec->qualifier == 'H') { |
1167 | if (spec->flags & SIGN) | |
1168 | spec->type = FORMAT_TYPE_BYTE; | |
1169 | else | |
1170 | spec->type = FORMAT_TYPE_UBYTE; | |
fef20d9c | 1171 | } else if (spec->qualifier == 'h') { |
39e874f8 | 1172 | if (spec->flags & SIGN) |
fef20d9c FW |
1173 | spec->type = FORMAT_TYPE_SHORT; |
1174 | else | |
1175 | spec->type = FORMAT_TYPE_USHORT; | |
1176 | } else { | |
39e874f8 | 1177 | if (spec->flags & SIGN) |
fef20d9c FW |
1178 | spec->type = FORMAT_TYPE_INT; |
1179 | else | |
1180 | spec->type = FORMAT_TYPE_UINT; | |
78a8bf69 | 1181 | } |
fef20d9c FW |
1182 | |
1183 | return ++fmt - start; | |
78a8bf69 LT |
1184 | } |
1185 | ||
1da177e4 LT |
1186 | /** |
1187 | * vsnprintf - Format a string and place it in a buffer | |
1188 | * @buf: The buffer to place the result into | |
1189 | * @size: The size of the buffer, including the trailing null space | |
1190 | * @fmt: The format string to use | |
1191 | * @args: Arguments for the format string | |
1192 | * | |
20036fdc | 1193 | * This function follows C99 vsnprintf, but has some extensions: |
91adcd2c SR |
1194 | * %pS output the name of a text symbol with offset |
1195 | * %ps output the name of a text symbol without offset | |
0c8b946e FW |
1196 | * %pF output the name of a function pointer with its offset |
1197 | * %pf output the name of a function pointer without its offset | |
8a79503a UKK |
1198 | * %pR output the address range in a struct resource with decoded flags |
1199 | * %pr output the address range in a struct resource with raw flags | |
1200 | * %pM output a 6-byte MAC address with colons | |
1201 | * %pm output a 6-byte MAC address without colons | |
1202 | * %pI4 print an IPv4 address without leading zeros | |
1203 | * %pi4 print an IPv4 address with leading zeros | |
1204 | * %pI6 print an IPv6 address with colons | |
1205 | * %pi6 print an IPv6 address without colons | |
1206 | * %pI6c print an IPv6 address as specified by | |
1207 | * http://www.ietf.org/id/draft-kawamura-ipv6-text-representation-03.txt | |
1208 | * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper | |
1209 | * case. | |
0efb4d20 | 1210 | * %n is ignored |
20036fdc | 1211 | * |
1da177e4 LT |
1212 | * The return value is the number of characters which would |
1213 | * be generated for the given input, excluding the trailing | |
1214 | * '\0', as per ISO C99. If you want to have the exact | |
1215 | * number of characters written into @buf as return value | |
72fd4a35 | 1216 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
1217 | * return is greater than or equal to @size, the resulting |
1218 | * string is truncated. | |
1219 | * | |
1220 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 1221 | * You probably want snprintf() instead. |
1da177e4 LT |
1222 | */ |
1223 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1224 | { | |
1da177e4 | 1225 | unsigned long long num; |
d4be151b | 1226 | char *str, *end; |
fef20d9c | 1227 | struct printf_spec spec = {0}; |
1da177e4 | 1228 | |
f796937a JF |
1229 | /* Reject out-of-range values early. Large positive sizes are |
1230 | used for unknown buffer sizes. */ | |
2f30b1f9 | 1231 | if (WARN_ON_ONCE((int) size < 0)) |
1da177e4 | 1232 | return 0; |
1da177e4 LT |
1233 | |
1234 | str = buf; | |
f796937a | 1235 | end = buf + size; |
1da177e4 | 1236 | |
f796937a JF |
1237 | /* Make sure end is always >= buf */ |
1238 | if (end < buf) { | |
1239 | end = ((void *)-1); | |
1240 | size = end - buf; | |
1da177e4 LT |
1241 | } |
1242 | ||
fef20d9c FW |
1243 | while (*fmt) { |
1244 | const char *old_fmt = fmt; | |
d4be151b | 1245 | int read = format_decode(fmt, &spec); |
1da177e4 | 1246 | |
fef20d9c | 1247 | fmt += read; |
1da177e4 | 1248 | |
fef20d9c FW |
1249 | switch (spec.type) { |
1250 | case FORMAT_TYPE_NONE: { | |
1251 | int copy = read; | |
1252 | if (str < end) { | |
1253 | if (copy > end - str) | |
1254 | copy = end - str; | |
1255 | memcpy(str, old_fmt, copy); | |
1da177e4 | 1256 | } |
fef20d9c FW |
1257 | str += read; |
1258 | break; | |
1da177e4 LT |
1259 | } |
1260 | ||
ed681a91 | 1261 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1262 | spec.field_width = va_arg(args, int); |
1263 | break; | |
1da177e4 | 1264 | |
fef20d9c FW |
1265 | case FORMAT_TYPE_PRECISION: |
1266 | spec.precision = va_arg(args, int); | |
1267 | break; | |
1da177e4 | 1268 | |
d4be151b AGR |
1269 | case FORMAT_TYPE_CHAR: { |
1270 | char c; | |
1271 | ||
fef20d9c FW |
1272 | if (!(spec.flags & LEFT)) { |
1273 | while (--spec.field_width > 0) { | |
f796937a | 1274 | if (str < end) |
1da177e4 LT |
1275 | *str = ' '; |
1276 | ++str; | |
1da177e4 | 1277 | |
fef20d9c FW |
1278 | } |
1279 | } | |
1280 | c = (unsigned char) va_arg(args, int); | |
1281 | if (str < end) | |
1282 | *str = c; | |
1283 | ++str; | |
1284 | while (--spec.field_width > 0) { | |
f796937a | 1285 | if (str < end) |
fef20d9c | 1286 | *str = ' '; |
1da177e4 | 1287 | ++str; |
fef20d9c FW |
1288 | } |
1289 | break; | |
d4be151b | 1290 | } |
1da177e4 | 1291 | |
fef20d9c FW |
1292 | case FORMAT_TYPE_STR: |
1293 | str = string(str, end, va_arg(args, char *), spec); | |
1294 | break; | |
1da177e4 | 1295 | |
fef20d9c FW |
1296 | case FORMAT_TYPE_PTR: |
1297 | str = pointer(fmt+1, str, end, va_arg(args, void *), | |
1298 | spec); | |
1299 | while (isalnum(*fmt)) | |
1300 | fmt++; | |
1301 | break; | |
1da177e4 | 1302 | |
fef20d9c FW |
1303 | case FORMAT_TYPE_PERCENT_CHAR: |
1304 | if (str < end) | |
1305 | *str = '%'; | |
1306 | ++str; | |
1307 | break; | |
1da177e4 | 1308 | |
fef20d9c FW |
1309 | case FORMAT_TYPE_INVALID: |
1310 | if (str < end) | |
1311 | *str = '%'; | |
1312 | ++str; | |
fef20d9c FW |
1313 | break; |
1314 | ||
1315 | case FORMAT_TYPE_NRCHARS: { | |
1316 | int qualifier = spec.qualifier; | |
1317 | ||
1318 | if (qualifier == 'l') { | |
1319 | long *ip = va_arg(args, long *); | |
1320 | *ip = (str - buf); | |
08562cb2 | 1321 | } else if (TOLOWER(qualifier) == 'z') { |
fef20d9c FW |
1322 | size_t *ip = va_arg(args, size_t *); |
1323 | *ip = (str - buf); | |
1324 | } else { | |
1325 | int *ip = va_arg(args, int *); | |
1326 | *ip = (str - buf); | |
1327 | } | |
1328 | break; | |
1da177e4 | 1329 | } |
fef20d9c FW |
1330 | |
1331 | default: | |
1332 | switch (spec.type) { | |
1333 | case FORMAT_TYPE_LONG_LONG: | |
1334 | num = va_arg(args, long long); | |
1335 | break; | |
1336 | case FORMAT_TYPE_ULONG: | |
1337 | num = va_arg(args, unsigned long); | |
1338 | break; | |
1339 | case FORMAT_TYPE_LONG: | |
1340 | num = va_arg(args, long); | |
1341 | break; | |
1342 | case FORMAT_TYPE_SIZE_T: | |
1343 | num = va_arg(args, size_t); | |
1344 | break; | |
1345 | case FORMAT_TYPE_PTRDIFF: | |
1346 | num = va_arg(args, ptrdiff_t); | |
1347 | break; | |
a4e94ef0 Z |
1348 | case FORMAT_TYPE_UBYTE: |
1349 | num = (unsigned char) va_arg(args, int); | |
1350 | break; | |
1351 | case FORMAT_TYPE_BYTE: | |
1352 | num = (signed char) va_arg(args, int); | |
1353 | break; | |
fef20d9c FW |
1354 | case FORMAT_TYPE_USHORT: |
1355 | num = (unsigned short) va_arg(args, int); | |
1356 | break; | |
1357 | case FORMAT_TYPE_SHORT: | |
1358 | num = (short) va_arg(args, int); | |
1359 | break; | |
39e874f8 FW |
1360 | case FORMAT_TYPE_INT: |
1361 | num = (int) va_arg(args, int); | |
fef20d9c FW |
1362 | break; |
1363 | default: | |
1364 | num = va_arg(args, unsigned int); | |
1365 | } | |
1366 | ||
1367 | str = number(str, end, num, spec); | |
1da177e4 | 1368 | } |
1da177e4 | 1369 | } |
fef20d9c | 1370 | |
f796937a JF |
1371 | if (size > 0) { |
1372 | if (str < end) | |
1373 | *str = '\0'; | |
1374 | else | |
0a6047ee | 1375 | end[-1] = '\0'; |
f796937a | 1376 | } |
fef20d9c | 1377 | |
f796937a | 1378 | /* the trailing null byte doesn't count towards the total */ |
1da177e4 | 1379 | return str-buf; |
fef20d9c | 1380 | |
1da177e4 | 1381 | } |
1da177e4 LT |
1382 | EXPORT_SYMBOL(vsnprintf); |
1383 | ||
1384 | /** | |
1385 | * vscnprintf - Format a string and place it in a buffer | |
1386 | * @buf: The buffer to place the result into | |
1387 | * @size: The size of the buffer, including the trailing null space | |
1388 | * @fmt: The format string to use | |
1389 | * @args: Arguments for the format string | |
1390 | * | |
1391 | * The return value is the number of characters which have been written into | |
1392 | * the @buf not including the trailing '\0'. If @size is <= 0 the function | |
1393 | * returns 0. | |
1394 | * | |
1395 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 1396 | * You probably want scnprintf() instead. |
20036fdc AK |
1397 | * |
1398 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1399 | */ |
1400 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1401 | { | |
1402 | int i; | |
1403 | ||
7b9186f5 AGR |
1404 | i = vsnprintf(buf, size, fmt, args); |
1405 | ||
1da177e4 LT |
1406 | return (i >= size) ? (size - 1) : i; |
1407 | } | |
1da177e4 LT |
1408 | EXPORT_SYMBOL(vscnprintf); |
1409 | ||
1410 | /** | |
1411 | * snprintf - Format a string and place it in a buffer | |
1412 | * @buf: The buffer to place the result into | |
1413 | * @size: The size of the buffer, including the trailing null space | |
1414 | * @fmt: The format string to use | |
1415 | * @...: Arguments for the format string | |
1416 | * | |
1417 | * The return value is the number of characters which would be | |
1418 | * generated for the given input, excluding the trailing null, | |
1419 | * as per ISO C99. If the return is greater than or equal to | |
1420 | * @size, the resulting string is truncated. | |
20036fdc AK |
1421 | * |
1422 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 1423 | */ |
7b9186f5 | 1424 | int snprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
1425 | { |
1426 | va_list args; | |
1427 | int i; | |
1428 | ||
1429 | va_start(args, fmt); | |
7b9186f5 | 1430 | i = vsnprintf(buf, size, fmt, args); |
1da177e4 | 1431 | va_end(args); |
7b9186f5 | 1432 | |
1da177e4 LT |
1433 | return i; |
1434 | } | |
1da177e4 LT |
1435 | EXPORT_SYMBOL(snprintf); |
1436 | ||
1437 | /** | |
1438 | * scnprintf - Format a string and place it in a buffer | |
1439 | * @buf: The buffer to place the result into | |
1440 | * @size: The size of the buffer, including the trailing null space | |
1441 | * @fmt: The format string to use | |
1442 | * @...: Arguments for the format string | |
1443 | * | |
1444 | * The return value is the number of characters written into @buf not including | |
ea6f3281 | 1445 | * the trailing '\0'. If @size is <= 0 the function returns 0. |
1da177e4 LT |
1446 | */ |
1447 | ||
7b9186f5 | 1448 | int scnprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
1449 | { |
1450 | va_list args; | |
1451 | int i; | |
1452 | ||
1453 | va_start(args, fmt); | |
1454 | i = vsnprintf(buf, size, fmt, args); | |
1455 | va_end(args); | |
7b9186f5 | 1456 | |
1da177e4 LT |
1457 | return (i >= size) ? (size - 1) : i; |
1458 | } | |
1459 | EXPORT_SYMBOL(scnprintf); | |
1460 | ||
1461 | /** | |
1462 | * vsprintf - Format a string and place it in a buffer | |
1463 | * @buf: The buffer to place the result into | |
1464 | * @fmt: The format string to use | |
1465 | * @args: Arguments for the format string | |
1466 | * | |
1467 | * The function returns the number of characters written | |
72fd4a35 | 1468 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
1469 | * buffer overflows. |
1470 | * | |
1471 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 1472 | * You probably want sprintf() instead. |
20036fdc AK |
1473 | * |
1474 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1475 | */ |
1476 | int vsprintf(char *buf, const char *fmt, va_list args) | |
1477 | { | |
1478 | return vsnprintf(buf, INT_MAX, fmt, args); | |
1479 | } | |
1da177e4 LT |
1480 | EXPORT_SYMBOL(vsprintf); |
1481 | ||
1482 | /** | |
1483 | * sprintf - Format a string and place it in a buffer | |
1484 | * @buf: The buffer to place the result into | |
1485 | * @fmt: The format string to use | |
1486 | * @...: Arguments for the format string | |
1487 | * | |
1488 | * The function returns the number of characters written | |
72fd4a35 | 1489 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 | 1490 | * buffer overflows. |
20036fdc AK |
1491 | * |
1492 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 1493 | */ |
7b9186f5 | 1494 | int sprintf(char *buf, const char *fmt, ...) |
1da177e4 LT |
1495 | { |
1496 | va_list args; | |
1497 | int i; | |
1498 | ||
1499 | va_start(args, fmt); | |
7b9186f5 | 1500 | i = vsnprintf(buf, INT_MAX, fmt, args); |
1da177e4 | 1501 | va_end(args); |
7b9186f5 | 1502 | |
1da177e4 LT |
1503 | return i; |
1504 | } | |
1da177e4 LT |
1505 | EXPORT_SYMBOL(sprintf); |
1506 | ||
4370aa4a LJ |
1507 | #ifdef CONFIG_BINARY_PRINTF |
1508 | /* | |
1509 | * bprintf service: | |
1510 | * vbin_printf() - VA arguments to binary data | |
1511 | * bstr_printf() - Binary data to text string | |
1512 | */ | |
1513 | ||
1514 | /** | |
1515 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
1516 | * @bin_buf: The buffer to place args' binary value | |
1517 | * @size: The size of the buffer(by words(32bits), not characters) | |
1518 | * @fmt: The format string to use | |
1519 | * @args: Arguments for the format string | |
1520 | * | |
1521 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
1522 | * is skiped. | |
1523 | * | |
1524 | * The return value is the number of words(32bits) which would be generated for | |
1525 | * the given input. | |
1526 | * | |
1527 | * NOTE: | |
1528 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
1529 | * valid for bstr_printf(). | |
1530 | */ | |
1531 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
1532 | { | |
fef20d9c | 1533 | struct printf_spec spec = {0}; |
4370aa4a | 1534 | char *str, *end; |
4370aa4a LJ |
1535 | |
1536 | str = (char *)bin_buf; | |
1537 | end = (char *)(bin_buf + size); | |
1538 | ||
1539 | #define save_arg(type) \ | |
1540 | do { \ | |
1541 | if (sizeof(type) == 8) { \ | |
1542 | unsigned long long value; \ | |
1543 | str = PTR_ALIGN(str, sizeof(u32)); \ | |
1544 | value = va_arg(args, unsigned long long); \ | |
1545 | if (str + sizeof(type) <= end) { \ | |
1546 | *(u32 *)str = *(u32 *)&value; \ | |
1547 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ | |
1548 | } \ | |
1549 | } else { \ | |
1550 | unsigned long value; \ | |
1551 | str = PTR_ALIGN(str, sizeof(type)); \ | |
1552 | value = va_arg(args, int); \ | |
1553 | if (str + sizeof(type) <= end) \ | |
1554 | *(typeof(type) *)str = (type)value; \ | |
1555 | } \ | |
1556 | str += sizeof(type); \ | |
1557 | } while (0) | |
1558 | ||
fef20d9c | 1559 | while (*fmt) { |
d4be151b | 1560 | int read = format_decode(fmt, &spec); |
4370aa4a | 1561 | |
fef20d9c | 1562 | fmt += read; |
4370aa4a | 1563 | |
fef20d9c FW |
1564 | switch (spec.type) { |
1565 | case FORMAT_TYPE_NONE: | |
d4be151b AGR |
1566 | case FORMAT_TYPE_INVALID: |
1567 | case FORMAT_TYPE_PERCENT_CHAR: | |
fef20d9c FW |
1568 | break; |
1569 | ||
ed681a91 | 1570 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1571 | case FORMAT_TYPE_PRECISION: |
1572 | save_arg(int); | |
1573 | break; | |
1574 | ||
1575 | case FORMAT_TYPE_CHAR: | |
4370aa4a | 1576 | save_arg(char); |
fef20d9c FW |
1577 | break; |
1578 | ||
1579 | case FORMAT_TYPE_STR: { | |
4370aa4a LJ |
1580 | const char *save_str = va_arg(args, char *); |
1581 | size_t len; | |
6c356634 | 1582 | |
4370aa4a LJ |
1583 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE |
1584 | || (unsigned long)save_str < PAGE_SIZE) | |
0f4f81dc | 1585 | save_str = "(null)"; |
6c356634 AGR |
1586 | len = strlen(save_str) + 1; |
1587 | if (str + len < end) | |
1588 | memcpy(str, save_str, len); | |
1589 | str += len; | |
fef20d9c | 1590 | break; |
4370aa4a | 1591 | } |
fef20d9c FW |
1592 | |
1593 | case FORMAT_TYPE_PTR: | |
4370aa4a LJ |
1594 | save_arg(void *); |
1595 | /* skip all alphanumeric pointer suffixes */ | |
fef20d9c | 1596 | while (isalnum(*fmt)) |
4370aa4a | 1597 | fmt++; |
fef20d9c FW |
1598 | break; |
1599 | ||
fef20d9c | 1600 | case FORMAT_TYPE_NRCHARS: { |
4370aa4a | 1601 | /* skip %n 's argument */ |
fef20d9c | 1602 | int qualifier = spec.qualifier; |
4370aa4a LJ |
1603 | void *skip_arg; |
1604 | if (qualifier == 'l') | |
1605 | skip_arg = va_arg(args, long *); | |
08562cb2 | 1606 | else if (TOLOWER(qualifier) == 'z') |
4370aa4a LJ |
1607 | skip_arg = va_arg(args, size_t *); |
1608 | else | |
1609 | skip_arg = va_arg(args, int *); | |
fef20d9c | 1610 | break; |
4370aa4a | 1611 | } |
fef20d9c FW |
1612 | |
1613 | default: | |
1614 | switch (spec.type) { | |
1615 | ||
1616 | case FORMAT_TYPE_LONG_LONG: | |
4370aa4a | 1617 | save_arg(long long); |
fef20d9c FW |
1618 | break; |
1619 | case FORMAT_TYPE_ULONG: | |
1620 | case FORMAT_TYPE_LONG: | |
4370aa4a | 1621 | save_arg(unsigned long); |
fef20d9c FW |
1622 | break; |
1623 | case FORMAT_TYPE_SIZE_T: | |
4370aa4a | 1624 | save_arg(size_t); |
fef20d9c FW |
1625 | break; |
1626 | case FORMAT_TYPE_PTRDIFF: | |
4370aa4a | 1627 | save_arg(ptrdiff_t); |
fef20d9c | 1628 | break; |
a4e94ef0 Z |
1629 | case FORMAT_TYPE_UBYTE: |
1630 | case FORMAT_TYPE_BYTE: | |
1631 | save_arg(char); | |
1632 | break; | |
fef20d9c FW |
1633 | case FORMAT_TYPE_USHORT: |
1634 | case FORMAT_TYPE_SHORT: | |
4370aa4a | 1635 | save_arg(short); |
fef20d9c FW |
1636 | break; |
1637 | default: | |
4370aa4a | 1638 | save_arg(int); |
fef20d9c | 1639 | } |
4370aa4a LJ |
1640 | } |
1641 | } | |
fef20d9c | 1642 | |
7b9186f5 | 1643 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
fef20d9c | 1644 | #undef save_arg |
4370aa4a LJ |
1645 | } |
1646 | EXPORT_SYMBOL_GPL(vbin_printf); | |
1647 | ||
1648 | /** | |
1649 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
1650 | * @buf: The buffer to place the result into | |
1651 | * @size: The size of the buffer, including the trailing null space | |
1652 | * @fmt: The format string to use | |
1653 | * @bin_buf: Binary arguments for the format string | |
1654 | * | |
1655 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
1656 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
1657 | * a binary buffer that generated by vbin_printf. | |
1658 | * | |
1659 | * The format follows C99 vsnprintf, but has some extensions: | |
0efb4d20 | 1660 | * see vsnprintf comment for details. |
4370aa4a LJ |
1661 | * |
1662 | * The return value is the number of characters which would | |
1663 | * be generated for the given input, excluding the trailing | |
1664 | * '\0', as per ISO C99. If you want to have the exact | |
1665 | * number of characters written into @buf as return value | |
1666 | * (not including the trailing '\0'), use vscnprintf(). If the | |
1667 | * return is greater than or equal to @size, the resulting | |
1668 | * string is truncated. | |
1669 | */ | |
1670 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
1671 | { | |
fef20d9c | 1672 | struct printf_spec spec = {0}; |
d4be151b AGR |
1673 | char *str, *end; |
1674 | const char *args = (const char *)bin_buf; | |
4370aa4a | 1675 | |
2f30b1f9 | 1676 | if (WARN_ON_ONCE((int) size < 0)) |
4370aa4a | 1677 | return 0; |
4370aa4a LJ |
1678 | |
1679 | str = buf; | |
1680 | end = buf + size; | |
1681 | ||
1682 | #define get_arg(type) \ | |
1683 | ({ \ | |
1684 | typeof(type) value; \ | |
1685 | if (sizeof(type) == 8) { \ | |
1686 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
1687 | *(u32 *)&value = *(u32 *)args; \ | |
1688 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
1689 | } else { \ | |
1690 | args = PTR_ALIGN(args, sizeof(type)); \ | |
1691 | value = *(typeof(type) *)args; \ | |
1692 | } \ | |
1693 | args += sizeof(type); \ | |
1694 | value; \ | |
1695 | }) | |
1696 | ||
1697 | /* Make sure end is always >= buf */ | |
1698 | if (end < buf) { | |
1699 | end = ((void *)-1); | |
1700 | size = end - buf; | |
1701 | } | |
1702 | ||
fef20d9c | 1703 | while (*fmt) { |
fef20d9c | 1704 | const char *old_fmt = fmt; |
d4be151b | 1705 | int read = format_decode(fmt, &spec); |
4370aa4a | 1706 | |
fef20d9c | 1707 | fmt += read; |
4370aa4a | 1708 | |
fef20d9c FW |
1709 | switch (spec.type) { |
1710 | case FORMAT_TYPE_NONE: { | |
1711 | int copy = read; | |
1712 | if (str < end) { | |
1713 | if (copy > end - str) | |
1714 | copy = end - str; | |
1715 | memcpy(str, old_fmt, copy); | |
4370aa4a | 1716 | } |
fef20d9c FW |
1717 | str += read; |
1718 | break; | |
4370aa4a LJ |
1719 | } |
1720 | ||
ed681a91 | 1721 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1722 | spec.field_width = get_arg(int); |
1723 | break; | |
4370aa4a | 1724 | |
fef20d9c FW |
1725 | case FORMAT_TYPE_PRECISION: |
1726 | spec.precision = get_arg(int); | |
1727 | break; | |
4370aa4a | 1728 | |
d4be151b AGR |
1729 | case FORMAT_TYPE_CHAR: { |
1730 | char c; | |
1731 | ||
fef20d9c FW |
1732 | if (!(spec.flags & LEFT)) { |
1733 | while (--spec.field_width > 0) { | |
4370aa4a LJ |
1734 | if (str < end) |
1735 | *str = ' '; | |
1736 | ++str; | |
1737 | } | |
1738 | } | |
1739 | c = (unsigned char) get_arg(char); | |
1740 | if (str < end) | |
1741 | *str = c; | |
1742 | ++str; | |
fef20d9c | 1743 | while (--spec.field_width > 0) { |
4370aa4a LJ |
1744 | if (str < end) |
1745 | *str = ' '; | |
1746 | ++str; | |
1747 | } | |
fef20d9c | 1748 | break; |
d4be151b | 1749 | } |
4370aa4a | 1750 | |
fef20d9c | 1751 | case FORMAT_TYPE_STR: { |
4370aa4a | 1752 | const char *str_arg = args; |
d4be151b | 1753 | args += strlen(str_arg) + 1; |
fef20d9c FW |
1754 | str = string(str, end, (char *)str_arg, spec); |
1755 | break; | |
4370aa4a LJ |
1756 | } |
1757 | ||
fef20d9c FW |
1758 | case FORMAT_TYPE_PTR: |
1759 | str = pointer(fmt+1, str, end, get_arg(void *), spec); | |
1760 | while (isalnum(*fmt)) | |
4370aa4a | 1761 | fmt++; |
fef20d9c | 1762 | break; |
4370aa4a | 1763 | |
fef20d9c | 1764 | case FORMAT_TYPE_PERCENT_CHAR: |
fef20d9c | 1765 | case FORMAT_TYPE_INVALID: |
4370aa4a LJ |
1766 | if (str < end) |
1767 | *str = '%'; | |
1768 | ++str; | |
fef20d9c FW |
1769 | break; |
1770 | ||
1771 | case FORMAT_TYPE_NRCHARS: | |
1772 | /* skip */ | |
1773 | break; | |
1774 | ||
d4be151b AGR |
1775 | default: { |
1776 | unsigned long long num; | |
1777 | ||
fef20d9c FW |
1778 | switch (spec.type) { |
1779 | ||
1780 | case FORMAT_TYPE_LONG_LONG: | |
1781 | num = get_arg(long long); | |
1782 | break; | |
1783 | case FORMAT_TYPE_ULONG: | |
fef20d9c FW |
1784 | case FORMAT_TYPE_LONG: |
1785 | num = get_arg(unsigned long); | |
1786 | break; | |
1787 | case FORMAT_TYPE_SIZE_T: | |
1788 | num = get_arg(size_t); | |
1789 | break; | |
1790 | case FORMAT_TYPE_PTRDIFF: | |
1791 | num = get_arg(ptrdiff_t); | |
1792 | break; | |
a4e94ef0 Z |
1793 | case FORMAT_TYPE_UBYTE: |
1794 | num = get_arg(unsigned char); | |
1795 | break; | |
1796 | case FORMAT_TYPE_BYTE: | |
1797 | num = get_arg(signed char); | |
1798 | break; | |
fef20d9c FW |
1799 | case FORMAT_TYPE_USHORT: |
1800 | num = get_arg(unsigned short); | |
1801 | break; | |
1802 | case FORMAT_TYPE_SHORT: | |
1803 | num = get_arg(short); | |
1804 | break; | |
1805 | case FORMAT_TYPE_UINT: | |
1806 | num = get_arg(unsigned int); | |
1807 | break; | |
1808 | default: | |
1809 | num = get_arg(int); | |
1810 | } | |
1811 | ||
1812 | str = number(str, end, num, spec); | |
d4be151b AGR |
1813 | } /* default: */ |
1814 | } /* switch(spec.type) */ | |
1815 | } /* while(*fmt) */ | |
fef20d9c | 1816 | |
4370aa4a LJ |
1817 | if (size > 0) { |
1818 | if (str < end) | |
1819 | *str = '\0'; | |
1820 | else | |
1821 | end[-1] = '\0'; | |
1822 | } | |
fef20d9c | 1823 | |
4370aa4a LJ |
1824 | #undef get_arg |
1825 | ||
1826 | /* the trailing null byte doesn't count towards the total */ | |
1827 | return str - buf; | |
1828 | } | |
1829 | EXPORT_SYMBOL_GPL(bstr_printf); | |
1830 | ||
1831 | /** | |
1832 | * bprintf - Parse a format string and place args' binary value in a buffer | |
1833 | * @bin_buf: The buffer to place args' binary value | |
1834 | * @size: The size of the buffer(by words(32bits), not characters) | |
1835 | * @fmt: The format string to use | |
1836 | * @...: Arguments for the format string | |
1837 | * | |
1838 | * The function returns the number of words(u32) written | |
1839 | * into @bin_buf. | |
1840 | */ | |
1841 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
1842 | { | |
1843 | va_list args; | |
1844 | int ret; | |
1845 | ||
1846 | va_start(args, fmt); | |
1847 | ret = vbin_printf(bin_buf, size, fmt, args); | |
1848 | va_end(args); | |
7b9186f5 | 1849 | |
4370aa4a LJ |
1850 | return ret; |
1851 | } | |
1852 | EXPORT_SYMBOL_GPL(bprintf); | |
1853 | ||
1854 | #endif /* CONFIG_BINARY_PRINTF */ | |
1855 | ||
1da177e4 LT |
1856 | /** |
1857 | * vsscanf - Unformat a buffer into a list of arguments | |
1858 | * @buf: input buffer | |
1859 | * @fmt: format of buffer | |
1860 | * @args: arguments | |
1861 | */ | |
7b9186f5 | 1862 | int vsscanf(const char *buf, const char *fmt, va_list args) |
1da177e4 LT |
1863 | { |
1864 | const char *str = buf; | |
1865 | char *next; | |
1866 | char digit; | |
1867 | int num = 0; | |
7b9186f5 | 1868 | int qualifier, base, field_width; |
d4be151b | 1869 | bool is_sign; |
1da177e4 | 1870 | |
7b9186f5 | 1871 | while (*fmt && *str) { |
1da177e4 LT |
1872 | /* skip any white space in format */ |
1873 | /* white space in format matchs any amount of | |
1874 | * white space, including none, in the input. | |
1875 | */ | |
1876 | if (isspace(*fmt)) { | |
e7d2860b AGR |
1877 | fmt = skip_spaces(++fmt); |
1878 | str = skip_spaces(str); | |
1da177e4 LT |
1879 | } |
1880 | ||
1881 | /* anything that is not a conversion must match exactly */ | |
1882 | if (*fmt != '%' && *fmt) { | |
1883 | if (*fmt++ != *str++) | |
1884 | break; | |
1885 | continue; | |
1886 | } | |
1887 | ||
1888 | if (!*fmt) | |
1889 | break; | |
1890 | ++fmt; | |
7b9186f5 | 1891 | |
1da177e4 LT |
1892 | /* skip this conversion. |
1893 | * advance both strings to next white space | |
1894 | */ | |
1895 | if (*fmt == '*') { | |
8fccae2c | 1896 | while (!isspace(*fmt) && *fmt != '%' && *fmt) |
1da177e4 LT |
1897 | fmt++; |
1898 | while (!isspace(*str) && *str) | |
1899 | str++; | |
1900 | continue; | |
1901 | } | |
1902 | ||
1903 | /* get field width */ | |
1904 | field_width = -1; | |
1905 | if (isdigit(*fmt)) | |
1906 | field_width = skip_atoi(&fmt); | |
1907 | ||
1908 | /* get conversion qualifier */ | |
1909 | qualifier = -1; | |
08562cb2 AGR |
1910 | if (*fmt == 'h' || TOLOWER(*fmt) == 'l' || |
1911 | TOLOWER(*fmt) == 'z') { | |
1da177e4 LT |
1912 | qualifier = *fmt++; |
1913 | if (unlikely(qualifier == *fmt)) { | |
1914 | if (qualifier == 'h') { | |
1915 | qualifier = 'H'; | |
1916 | fmt++; | |
1917 | } else if (qualifier == 'l') { | |
1918 | qualifier = 'L'; | |
1919 | fmt++; | |
1920 | } | |
1921 | } | |
1922 | } | |
1da177e4 LT |
1923 | |
1924 | if (!*fmt || !*str) | |
1925 | break; | |
1926 | ||
d4be151b AGR |
1927 | base = 10; |
1928 | is_sign = 0; | |
1929 | ||
7b9186f5 | 1930 | switch (*fmt++) { |
1da177e4 LT |
1931 | case 'c': |
1932 | { | |
7b9186f5 | 1933 | char *s = (char *)va_arg(args, char*); |
1da177e4 LT |
1934 | if (field_width == -1) |
1935 | field_width = 1; | |
1936 | do { | |
1937 | *s++ = *str++; | |
1938 | } while (--field_width > 0 && *str); | |
1939 | num++; | |
1940 | } | |
1941 | continue; | |
1942 | case 's': | |
1943 | { | |
7b9186f5 AGR |
1944 | char *s = (char *)va_arg(args, char *); |
1945 | if (field_width == -1) | |
1da177e4 LT |
1946 | field_width = INT_MAX; |
1947 | /* first, skip leading white space in buffer */ | |
e7d2860b | 1948 | str = skip_spaces(str); |
1da177e4 LT |
1949 | |
1950 | /* now copy until next white space */ | |
7b9186f5 | 1951 | while (*str && !isspace(*str) && field_width--) |
1da177e4 | 1952 | *s++ = *str++; |
1da177e4 LT |
1953 | *s = '\0'; |
1954 | num++; | |
1955 | } | |
1956 | continue; | |
1957 | case 'n': | |
1958 | /* return number of characters read so far */ | |
1959 | { | |
7b9186f5 | 1960 | int *i = (int *)va_arg(args, int*); |
1da177e4 LT |
1961 | *i = str - buf; |
1962 | } | |
1963 | continue; | |
1964 | case 'o': | |
1965 | base = 8; | |
1966 | break; | |
1967 | case 'x': | |
1968 | case 'X': | |
1969 | base = 16; | |
1970 | break; | |
1971 | case 'i': | |
7b9186f5 | 1972 | base = 0; |
1da177e4 LT |
1973 | case 'd': |
1974 | is_sign = 1; | |
1975 | case 'u': | |
1976 | break; | |
1977 | case '%': | |
1978 | /* looking for '%' in str */ | |
7b9186f5 | 1979 | if (*str++ != '%') |
1da177e4 LT |
1980 | return num; |
1981 | continue; | |
1982 | default: | |
1983 | /* invalid format; stop here */ | |
1984 | return num; | |
1985 | } | |
1986 | ||
1987 | /* have some sort of integer conversion. | |
1988 | * first, skip white space in buffer. | |
1989 | */ | |
e7d2860b | 1990 | str = skip_spaces(str); |
1da177e4 LT |
1991 | |
1992 | digit = *str; | |
1993 | if (is_sign && digit == '-') | |
1994 | digit = *(str + 1); | |
1995 | ||
1996 | if (!digit | |
7b9186f5 AGR |
1997 | || (base == 16 && !isxdigit(digit)) |
1998 | || (base == 10 && !isdigit(digit)) | |
1999 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
2000 | || (base == 0 && !isdigit(digit))) | |
2001 | break; | |
1da177e4 | 2002 | |
7b9186f5 | 2003 | switch (qualifier) { |
1da177e4 LT |
2004 | case 'H': /* that's 'hh' in format */ |
2005 | if (is_sign) { | |
7b9186f5 AGR |
2006 | signed char *s = (signed char *)va_arg(args, signed char *); |
2007 | *s = (signed char)simple_strtol(str, &next, base); | |
1da177e4 | 2008 | } else { |
7b9186f5 AGR |
2009 | unsigned char *s = (unsigned char *)va_arg(args, unsigned char *); |
2010 | *s = (unsigned char)simple_strtoul(str, &next, base); | |
1da177e4 LT |
2011 | } |
2012 | break; | |
2013 | case 'h': | |
2014 | if (is_sign) { | |
7b9186f5 AGR |
2015 | short *s = (short *)va_arg(args, short *); |
2016 | *s = (short)simple_strtol(str, &next, base); | |
1da177e4 | 2017 | } else { |
7b9186f5 AGR |
2018 | unsigned short *s = (unsigned short *)va_arg(args, unsigned short *); |
2019 | *s = (unsigned short)simple_strtoul(str, &next, base); | |
1da177e4 LT |
2020 | } |
2021 | break; | |
2022 | case 'l': | |
2023 | if (is_sign) { | |
7b9186f5 AGR |
2024 | long *l = (long *)va_arg(args, long *); |
2025 | *l = simple_strtol(str, &next, base); | |
1da177e4 | 2026 | } else { |
7b9186f5 AGR |
2027 | unsigned long *l = (unsigned long *)va_arg(args, unsigned long *); |
2028 | *l = simple_strtoul(str, &next, base); | |
1da177e4 LT |
2029 | } |
2030 | break; | |
2031 | case 'L': | |
2032 | if (is_sign) { | |
7b9186f5 AGR |
2033 | long long *l = (long long *)va_arg(args, long long *); |
2034 | *l = simple_strtoll(str, &next, base); | |
1da177e4 | 2035 | } else { |
7b9186f5 AGR |
2036 | unsigned long long *l = (unsigned long long *)va_arg(args, unsigned long long *); |
2037 | *l = simple_strtoull(str, &next, base); | |
1da177e4 LT |
2038 | } |
2039 | break; | |
2040 | case 'Z': | |
2041 | case 'z': | |
2042 | { | |
7b9186f5 AGR |
2043 | size_t *s = (size_t *)va_arg(args, size_t *); |
2044 | *s = (size_t)simple_strtoul(str, &next, base); | |
1da177e4 LT |
2045 | } |
2046 | break; | |
2047 | default: | |
2048 | if (is_sign) { | |
7b9186f5 AGR |
2049 | int *i = (int *)va_arg(args, int *); |
2050 | *i = (int)simple_strtol(str, &next, base); | |
1da177e4 | 2051 | } else { |
7b9186f5 AGR |
2052 | unsigned int *i = (unsigned int *)va_arg(args, unsigned int*); |
2053 | *i = (unsigned int)simple_strtoul(str, &next, base); | |
1da177e4 LT |
2054 | } |
2055 | break; | |
2056 | } | |
2057 | num++; | |
2058 | ||
2059 | if (!next) | |
2060 | break; | |
2061 | str = next; | |
2062 | } | |
c6b40d16 JB |
2063 | |
2064 | /* | |
2065 | * Now we've come all the way through so either the input string or the | |
2066 | * format ended. In the former case, there can be a %n at the current | |
2067 | * position in the format that needs to be filled. | |
2068 | */ | |
2069 | if (*fmt == '%' && *(fmt + 1) == 'n') { | |
2070 | int *p = (int *)va_arg(args, int *); | |
2071 | *p = str - buf; | |
2072 | } | |
2073 | ||
1da177e4 LT |
2074 | return num; |
2075 | } | |
1da177e4 LT |
2076 | EXPORT_SYMBOL(vsscanf); |
2077 | ||
2078 | /** | |
2079 | * sscanf - Unformat a buffer into a list of arguments | |
2080 | * @buf: input buffer | |
2081 | * @fmt: formatting of buffer | |
2082 | * @...: resulting arguments | |
2083 | */ | |
7b9186f5 | 2084 | int sscanf(const char *buf, const char *fmt, ...) |
1da177e4 LT |
2085 | { |
2086 | va_list args; | |
2087 | int i; | |
2088 | ||
7b9186f5 AGR |
2089 | va_start(args, fmt); |
2090 | i = vsscanf(buf, fmt, args); | |
1da177e4 | 2091 | va_end(args); |
7b9186f5 | 2092 | |
1da177e4 LT |
2093 | return i; |
2094 | } | |
1da177e4 | 2095 | EXPORT_SYMBOL(sscanf); |