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1 | /* | |
2 | * linux/lib/vsprintf.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | */ | |
6 | ||
7 | /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */ | |
8 | /* | |
9 | * Wirzenius wrote this portably, Torvalds fucked it up :-) | |
10 | */ | |
11 | ||
12 | /* | |
13 | * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com> | |
14 | * - changed to provide snprintf and vsnprintf functions | |
15 | * So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de> | |
16 | * - scnprintf and vscnprintf | |
17 | */ | |
18 | ||
19 | #include <stdarg.h> | |
20 | #include <linux/module.h> /* for KSYM_SYMBOL_LEN */ | |
21 | #include <linux/types.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/ctype.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/kallsyms.h> | |
26 | #include <linux/math64.h> | |
27 | #include <linux/uaccess.h> | |
28 | #include <linux/ioport.h> | |
29 | #include <linux/dcache.h> | |
30 | #include <linux/cred.h> | |
31 | #include <net/addrconf.h> | |
32 | ||
33 | #include <asm/page.h> /* for PAGE_SIZE */ | |
34 | #include <asm/sections.h> /* for dereference_function_descriptor() */ | |
35 | ||
36 | #include "kstrtox.h" | |
37 | ||
38 | /** | |
39 | * simple_strtoull - convert a string to an unsigned long long | |
40 | * @cp: The start of the string | |
41 | * @endp: A pointer to the end of the parsed string will be placed here | |
42 | * @base: The number base to use | |
43 | * | |
44 | * This function is obsolete. Please use kstrtoull instead. | |
45 | */ | |
46 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) | |
47 | { | |
48 | unsigned long long result; | |
49 | unsigned int rv; | |
50 | ||
51 | cp = _parse_integer_fixup_radix(cp, &base); | |
52 | rv = _parse_integer(cp, base, &result); | |
53 | /* FIXME */ | |
54 | cp += (rv & ~KSTRTOX_OVERFLOW); | |
55 | ||
56 | if (endp) | |
57 | *endp = (char *)cp; | |
58 | ||
59 | return result; | |
60 | } | |
61 | EXPORT_SYMBOL(simple_strtoull); | |
62 | ||
63 | /** | |
64 | * simple_strtoul - convert a string to an unsigned long | |
65 | * @cp: The start of the string | |
66 | * @endp: A pointer to the end of the parsed string will be placed here | |
67 | * @base: The number base to use | |
68 | * | |
69 | * This function is obsolete. Please use kstrtoul instead. | |
70 | */ | |
71 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) | |
72 | { | |
73 | return simple_strtoull(cp, endp, base); | |
74 | } | |
75 | EXPORT_SYMBOL(simple_strtoul); | |
76 | ||
77 | /** | |
78 | * simple_strtol - convert a string to a signed long | |
79 | * @cp: The start of the string | |
80 | * @endp: A pointer to the end of the parsed string will be placed here | |
81 | * @base: The number base to use | |
82 | * | |
83 | * This function is obsolete. Please use kstrtol instead. | |
84 | */ | |
85 | long simple_strtol(const char *cp, char **endp, unsigned int base) | |
86 | { | |
87 | if (*cp == '-') | |
88 | return -simple_strtoul(cp + 1, endp, base); | |
89 | ||
90 | return simple_strtoul(cp, endp, base); | |
91 | } | |
92 | EXPORT_SYMBOL(simple_strtol); | |
93 | ||
94 | /** | |
95 | * simple_strtoll - convert a string to a signed long long | |
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 | * | |
100 | * This function is obsolete. Please use kstrtoll instead. | |
101 | */ | |
102 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) | |
103 | { | |
104 | if (*cp == '-') | |
105 | return -simple_strtoull(cp + 1, endp, base); | |
106 | ||
107 | return simple_strtoull(cp, endp, base); | |
108 | } | |
109 | EXPORT_SYMBOL(simple_strtoll); | |
110 | ||
111 | static noinline_for_stack | |
112 | int skip_atoi(const char **s) | |
113 | { | |
114 | int i = 0; | |
115 | ||
116 | while (isdigit(**s)) | |
117 | i = i*10 + *((*s)++) - '0'; | |
118 | ||
119 | return i; | |
120 | } | |
121 | ||
122 | /* Decimal conversion is by far the most typical, and is used | |
123 | * for /proc and /sys data. This directly impacts e.g. top performance | |
124 | * with many processes running. We optimize it for speed | |
125 | * using ideas described at <http://www.cs.uiowa.edu/~jones/bcd/divide.html> | |
126 | * (with permission from the author, Douglas W. Jones). | |
127 | */ | |
128 | ||
129 | #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64 | |
130 | /* Formats correctly any integer in [0, 999999999] */ | |
131 | static noinline_for_stack | |
132 | char *put_dec_full9(char *buf, unsigned q) | |
133 | { | |
134 | unsigned r; | |
135 | ||
136 | /* | |
137 | * Possible ways to approx. divide by 10 | |
138 | * (x * 0x1999999a) >> 32 x < 1073741829 (multiply must be 64-bit) | |
139 | * (x * 0xcccd) >> 19 x < 81920 (x < 262149 when 64-bit mul) | |
140 | * (x * 0x6667) >> 18 x < 43699 | |
141 | * (x * 0x3334) >> 17 x < 16389 | |
142 | * (x * 0x199a) >> 16 x < 16389 | |
143 | * (x * 0x0ccd) >> 15 x < 16389 | |
144 | * (x * 0x0667) >> 14 x < 2739 | |
145 | * (x * 0x0334) >> 13 x < 1029 | |
146 | * (x * 0x019a) >> 12 x < 1029 | |
147 | * (x * 0x00cd) >> 11 x < 1029 shorter code than * 0x67 (on i386) | |
148 | * (x * 0x0067) >> 10 x < 179 | |
149 | * (x * 0x0034) >> 9 x < 69 same | |
150 | * (x * 0x001a) >> 8 x < 69 same | |
151 | * (x * 0x000d) >> 7 x < 69 same, shortest code (on i386) | |
152 | * (x * 0x0007) >> 6 x < 19 | |
153 | * See <http://www.cs.uiowa.edu/~jones/bcd/divide.html> | |
154 | */ | |
155 | r = (q * (uint64_t)0x1999999a) >> 32; | |
156 | *buf++ = (q - 10 * r) + '0'; /* 1 */ | |
157 | q = (r * (uint64_t)0x1999999a) >> 32; | |
158 | *buf++ = (r - 10 * q) + '0'; /* 2 */ | |
159 | r = (q * (uint64_t)0x1999999a) >> 32; | |
160 | *buf++ = (q - 10 * r) + '0'; /* 3 */ | |
161 | q = (r * (uint64_t)0x1999999a) >> 32; | |
162 | *buf++ = (r - 10 * q) + '0'; /* 4 */ | |
163 | r = (q * (uint64_t)0x1999999a) >> 32; | |
164 | *buf++ = (q - 10 * r) + '0'; /* 5 */ | |
165 | /* Now value is under 10000, can avoid 64-bit multiply */ | |
166 | q = (r * 0x199a) >> 16; | |
167 | *buf++ = (r - 10 * q) + '0'; /* 6 */ | |
168 | r = (q * 0xcd) >> 11; | |
169 | *buf++ = (q - 10 * r) + '0'; /* 7 */ | |
170 | q = (r * 0xcd) >> 11; | |
171 | *buf++ = (r - 10 * q) + '0'; /* 8 */ | |
172 | *buf++ = q + '0'; /* 9 */ | |
173 | return buf; | |
174 | } | |
175 | #endif | |
176 | ||
177 | /* Similar to above but do not pad with zeros. | |
178 | * Code can be easily arranged to print 9 digits too, but our callers | |
179 | * always call put_dec_full9() instead when the number has 9 decimal digits. | |
180 | */ | |
181 | static noinline_for_stack | |
182 | char *put_dec_trunc8(char *buf, unsigned r) | |
183 | { | |
184 | unsigned q; | |
185 | ||
186 | /* Copy of previous function's body with added early returns */ | |
187 | while (r >= 10000) { | |
188 | q = r + '0'; | |
189 | r = (r * (uint64_t)0x1999999a) >> 32; | |
190 | *buf++ = q - 10*r; | |
191 | } | |
192 | ||
193 | q = (r * 0x199a) >> 16; /* r <= 9999 */ | |
194 | *buf++ = (r - 10 * q) + '0'; | |
195 | if (q == 0) | |
196 | return buf; | |
197 | r = (q * 0xcd) >> 11; /* q <= 999 */ | |
198 | *buf++ = (q - 10 * r) + '0'; | |
199 | if (r == 0) | |
200 | return buf; | |
201 | q = (r * 0xcd) >> 11; /* r <= 99 */ | |
202 | *buf++ = (r - 10 * q) + '0'; | |
203 | if (q == 0) | |
204 | return buf; | |
205 | *buf++ = q + '0'; /* q <= 9 */ | |
206 | return buf; | |
207 | } | |
208 | ||
209 | /* There are two algorithms to print larger numbers. | |
210 | * One is generic: divide by 1000000000 and repeatedly print | |
211 | * groups of (up to) 9 digits. It's conceptually simple, | |
212 | * but requires a (unsigned long long) / 1000000000 division. | |
213 | * | |
214 | * Second algorithm splits 64-bit unsigned long long into 16-bit chunks, | |
215 | * manipulates them cleverly and generates groups of 4 decimal digits. | |
216 | * It so happens that it does NOT require long long division. | |
217 | * | |
218 | * If long is > 32 bits, division of 64-bit values is relatively easy, | |
219 | * and we will use the first algorithm. | |
220 | * If long long is > 64 bits (strange architecture with VERY large long long), | |
221 | * second algorithm can't be used, and we again use the first one. | |
222 | * | |
223 | * Else (if long is 32 bits and long long is 64 bits) we use second one. | |
224 | */ | |
225 | ||
226 | #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64 | |
227 | ||
228 | /* First algorithm: generic */ | |
229 | ||
230 | static | |
231 | char *put_dec(char *buf, unsigned long long n) | |
232 | { | |
233 | if (n >= 100*1000*1000) { | |
234 | while (n >= 1000*1000*1000) | |
235 | buf = put_dec_full9(buf, do_div(n, 1000*1000*1000)); | |
236 | if (n >= 100*1000*1000) | |
237 | return put_dec_full9(buf, n); | |
238 | } | |
239 | return put_dec_trunc8(buf, n); | |
240 | } | |
241 | ||
242 | #else | |
243 | ||
244 | /* Second algorithm: valid only for 64-bit long longs */ | |
245 | ||
246 | /* See comment in put_dec_full9 for choice of constants */ | |
247 | static noinline_for_stack | |
248 | void put_dec_full4(char *buf, unsigned q) | |
249 | { | |
250 | unsigned r; | |
251 | r = (q * 0xccd) >> 15; | |
252 | buf[0] = (q - 10 * r) + '0'; | |
253 | q = (r * 0xcd) >> 11; | |
254 | buf[1] = (r - 10 * q) + '0'; | |
255 | r = (q * 0xcd) >> 11; | |
256 | buf[2] = (q - 10 * r) + '0'; | |
257 | buf[3] = r + '0'; | |
258 | } | |
259 | ||
260 | /* | |
261 | * Call put_dec_full4 on x % 10000, return x / 10000. | |
262 | * The approximation x/10000 == (x * 0x346DC5D7) >> 43 | |
263 | * holds for all x < 1,128,869,999. The largest value this | |
264 | * helper will ever be asked to convert is 1,125,520,955. | |
265 | * (d1 in the put_dec code, assuming n is all-ones). | |
266 | */ | |
267 | static | |
268 | unsigned put_dec_helper4(char *buf, unsigned x) | |
269 | { | |
270 | uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43; | |
271 | ||
272 | put_dec_full4(buf, x - q * 10000); | |
273 | return q; | |
274 | } | |
275 | ||
276 | /* Based on code by Douglas W. Jones found at | |
277 | * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour> | |
278 | * (with permission from the author). | |
279 | * Performs no 64-bit division and hence should be fast on 32-bit machines. | |
280 | */ | |
281 | static | |
282 | char *put_dec(char *buf, unsigned long long n) | |
283 | { | |
284 | uint32_t d3, d2, d1, q, h; | |
285 | ||
286 | if (n < 100*1000*1000) | |
287 | return put_dec_trunc8(buf, n); | |
288 | ||
289 | d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */ | |
290 | h = (n >> 32); | |
291 | d2 = (h ) & 0xffff; | |
292 | d3 = (h >> 16); /* implicit "& 0xffff" */ | |
293 | ||
294 | q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff); | |
295 | q = put_dec_helper4(buf, q); | |
296 | ||
297 | q += 7671 * d3 + 9496 * d2 + 6 * d1; | |
298 | q = put_dec_helper4(buf+4, q); | |
299 | ||
300 | q += 4749 * d3 + 42 * d2; | |
301 | q = put_dec_helper4(buf+8, q); | |
302 | ||
303 | q += 281 * d3; | |
304 | buf += 12; | |
305 | if (q) | |
306 | buf = put_dec_trunc8(buf, q); | |
307 | else while (buf[-1] == '0') | |
308 | --buf; | |
309 | ||
310 | return buf; | |
311 | } | |
312 | ||
313 | #endif | |
314 | ||
315 | /* | |
316 | * Convert passed number to decimal string. | |
317 | * Returns the length of string. On buffer overflow, returns 0. | |
318 | * | |
319 | * If speed is not important, use snprintf(). It's easy to read the code. | |
320 | */ | |
321 | int num_to_str(char *buf, int size, unsigned long long num) | |
322 | { | |
323 | char tmp[sizeof(num) * 3]; | |
324 | int idx, len; | |
325 | ||
326 | /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */ | |
327 | if (num <= 9) { | |
328 | tmp[0] = '0' + num; | |
329 | len = 1; | |
330 | } else { | |
331 | len = put_dec(tmp, num) - tmp; | |
332 | } | |
333 | ||
334 | if (len > size) | |
335 | return 0; | |
336 | for (idx = 0; idx < len; ++idx) | |
337 | buf[idx] = tmp[len - idx - 1]; | |
338 | return len; | |
339 | } | |
340 | ||
341 | #define ZEROPAD 1 /* pad with zero */ | |
342 | #define SIGN 2 /* unsigned/signed long */ | |
343 | #define PLUS 4 /* show plus */ | |
344 | #define SPACE 8 /* space if plus */ | |
345 | #define LEFT 16 /* left justified */ | |
346 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ | |
347 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ | |
348 | ||
349 | enum format_type { | |
350 | FORMAT_TYPE_NONE, /* Just a string part */ | |
351 | FORMAT_TYPE_WIDTH, | |
352 | FORMAT_TYPE_PRECISION, | |
353 | FORMAT_TYPE_CHAR, | |
354 | FORMAT_TYPE_STR, | |
355 | FORMAT_TYPE_PTR, | |
356 | FORMAT_TYPE_PERCENT_CHAR, | |
357 | FORMAT_TYPE_INVALID, | |
358 | FORMAT_TYPE_LONG_LONG, | |
359 | FORMAT_TYPE_ULONG, | |
360 | FORMAT_TYPE_LONG, | |
361 | FORMAT_TYPE_UBYTE, | |
362 | FORMAT_TYPE_BYTE, | |
363 | FORMAT_TYPE_USHORT, | |
364 | FORMAT_TYPE_SHORT, | |
365 | FORMAT_TYPE_UINT, | |
366 | FORMAT_TYPE_INT, | |
367 | FORMAT_TYPE_SIZE_T, | |
368 | FORMAT_TYPE_PTRDIFF | |
369 | }; | |
370 | ||
371 | struct printf_spec { | |
372 | u8 type; /* format_type enum */ | |
373 | u8 flags; /* flags to number() */ | |
374 | u8 base; /* number base, 8, 10 or 16 only */ | |
375 | u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */ | |
376 | s16 field_width; /* width of output field */ | |
377 | s16 precision; /* # of digits/chars */ | |
378 | }; | |
379 | ||
380 | static noinline_for_stack | |
381 | char *number(char *buf, char *end, unsigned long long num, | |
382 | struct printf_spec spec) | |
383 | { | |
384 | /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ | |
385 | static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ | |
386 | ||
387 | char tmp[66]; | |
388 | char sign; | |
389 | char locase; | |
390 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); | |
391 | int i; | |
392 | bool is_zero = num == 0LL; | |
393 | ||
394 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' | |
395 | * produces same digits or (maybe lowercased) letters */ | |
396 | locase = (spec.flags & SMALL); | |
397 | if (spec.flags & LEFT) | |
398 | spec.flags &= ~ZEROPAD; | |
399 | sign = 0; | |
400 | if (spec.flags & SIGN) { | |
401 | if ((signed long long)num < 0) { | |
402 | sign = '-'; | |
403 | num = -(signed long long)num; | |
404 | spec.field_width--; | |
405 | } else if (spec.flags & PLUS) { | |
406 | sign = '+'; | |
407 | spec.field_width--; | |
408 | } else if (spec.flags & SPACE) { | |
409 | sign = ' '; | |
410 | spec.field_width--; | |
411 | } | |
412 | } | |
413 | if (need_pfx) { | |
414 | if (spec.base == 16) | |
415 | spec.field_width -= 2; | |
416 | else if (!is_zero) | |
417 | spec.field_width--; | |
418 | } | |
419 | ||
420 | /* generate full string in tmp[], in reverse order */ | |
421 | i = 0; | |
422 | if (num < spec.base) | |
423 | tmp[i++] = digits[num] | locase; | |
424 | /* Generic code, for any base: | |
425 | else do { | |
426 | tmp[i++] = (digits[do_div(num,base)] | locase); | |
427 | } while (num != 0); | |
428 | */ | |
429 | else if (spec.base != 10) { /* 8 or 16 */ | |
430 | int mask = spec.base - 1; | |
431 | int shift = 3; | |
432 | ||
433 | if (spec.base == 16) | |
434 | shift = 4; | |
435 | do { | |
436 | tmp[i++] = (digits[((unsigned char)num) & mask] | locase); | |
437 | num >>= shift; | |
438 | } while (num); | |
439 | } else { /* base 10 */ | |
440 | i = put_dec(tmp, num) - tmp; | |
441 | } | |
442 | ||
443 | /* printing 100 using %2d gives "100", not "00" */ | |
444 | if (i > spec.precision) | |
445 | spec.precision = i; | |
446 | /* leading space padding */ | |
447 | spec.field_width -= spec.precision; | |
448 | if (!(spec.flags & (ZEROPAD+LEFT))) { | |
449 | while (--spec.field_width >= 0) { | |
450 | if (buf < end) | |
451 | *buf = ' '; | |
452 | ++buf; | |
453 | } | |
454 | } | |
455 | /* sign */ | |
456 | if (sign) { | |
457 | if (buf < end) | |
458 | *buf = sign; | |
459 | ++buf; | |
460 | } | |
461 | /* "0x" / "0" prefix */ | |
462 | if (need_pfx) { | |
463 | if (spec.base == 16 || !is_zero) { | |
464 | if (buf < end) | |
465 | *buf = '0'; | |
466 | ++buf; | |
467 | } | |
468 | if (spec.base == 16) { | |
469 | if (buf < end) | |
470 | *buf = ('X' | locase); | |
471 | ++buf; | |
472 | } | |
473 | } | |
474 | /* zero or space padding */ | |
475 | if (!(spec.flags & LEFT)) { | |
476 | char c = (spec.flags & ZEROPAD) ? '0' : ' '; | |
477 | while (--spec.field_width >= 0) { | |
478 | if (buf < end) | |
479 | *buf = c; | |
480 | ++buf; | |
481 | } | |
482 | } | |
483 | /* hmm even more zero padding? */ | |
484 | while (i <= --spec.precision) { | |
485 | if (buf < end) | |
486 | *buf = '0'; | |
487 | ++buf; | |
488 | } | |
489 | /* actual digits of result */ | |
490 | while (--i >= 0) { | |
491 | if (buf < end) | |
492 | *buf = tmp[i]; | |
493 | ++buf; | |
494 | } | |
495 | /* trailing space padding */ | |
496 | while (--spec.field_width >= 0) { | |
497 | if (buf < end) | |
498 | *buf = ' '; | |
499 | ++buf; | |
500 | } | |
501 | ||
502 | return buf; | |
503 | } | |
504 | ||
505 | static noinline_for_stack | |
506 | char *string(char *buf, char *end, const char *s, struct printf_spec spec) | |
507 | { | |
508 | int len, i; | |
509 | ||
510 | if ((unsigned long)s < PAGE_SIZE) | |
511 | s = "(null)"; | |
512 | ||
513 | len = strnlen(s, spec.precision); | |
514 | ||
515 | if (!(spec.flags & LEFT)) { | |
516 | while (len < spec.field_width--) { | |
517 | if (buf < end) | |
518 | *buf = ' '; | |
519 | ++buf; | |
520 | } | |
521 | } | |
522 | for (i = 0; i < len; ++i) { | |
523 | if (buf < end) | |
524 | *buf = *s; | |
525 | ++buf; ++s; | |
526 | } | |
527 | while (len < spec.field_width--) { | |
528 | if (buf < end) | |
529 | *buf = ' '; | |
530 | ++buf; | |
531 | } | |
532 | ||
533 | return buf; | |
534 | } | |
535 | ||
536 | static void widen(char *buf, char *end, unsigned len, unsigned spaces) | |
537 | { | |
538 | size_t size; | |
539 | if (buf >= end) /* nowhere to put anything */ | |
540 | return; | |
541 | size = end - buf; | |
542 | if (size <= spaces) { | |
543 | memset(buf, ' ', size); | |
544 | return; | |
545 | } | |
546 | if (len) { | |
547 | if (len > size - spaces) | |
548 | len = size - spaces; | |
549 | memmove(buf + spaces, buf, len); | |
550 | } | |
551 | memset(buf, ' ', spaces); | |
552 | } | |
553 | ||
554 | static noinline_for_stack | |
555 | char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec, | |
556 | const char *fmt) | |
557 | { | |
558 | const char *array[4], *s; | |
559 | const struct dentry *p; | |
560 | int depth; | |
561 | int i, n; | |
562 | ||
563 | switch (fmt[1]) { | |
564 | case '2': case '3': case '4': | |
565 | depth = fmt[1] - '0'; | |
566 | break; | |
567 | default: | |
568 | depth = 1; | |
569 | } | |
570 | ||
571 | rcu_read_lock(); | |
572 | for (i = 0; i < depth; i++, d = p) { | |
573 | p = ACCESS_ONCE(d->d_parent); | |
574 | array[i] = ACCESS_ONCE(d->d_name.name); | |
575 | if (p == d) { | |
576 | if (i) | |
577 | array[i] = ""; | |
578 | i++; | |
579 | break; | |
580 | } | |
581 | } | |
582 | s = array[--i]; | |
583 | for (n = 0; n != spec.precision; n++, buf++) { | |
584 | char c = *s++; | |
585 | if (!c) { | |
586 | if (!i) | |
587 | break; | |
588 | c = '/'; | |
589 | s = array[--i]; | |
590 | } | |
591 | if (buf < end) | |
592 | *buf = c; | |
593 | } | |
594 | rcu_read_unlock(); | |
595 | if (n < spec.field_width) { | |
596 | /* we want to pad the sucker */ | |
597 | unsigned spaces = spec.field_width - n; | |
598 | if (!(spec.flags & LEFT)) { | |
599 | widen(buf - n, end, n, spaces); | |
600 | return buf + spaces; | |
601 | } | |
602 | while (spaces--) { | |
603 | if (buf < end) | |
604 | *buf = ' '; | |
605 | ++buf; | |
606 | } | |
607 | } | |
608 | return buf; | |
609 | } | |
610 | ||
611 | static noinline_for_stack | |
612 | char *symbol_string(char *buf, char *end, void *ptr, | |
613 | struct printf_spec spec, const char *fmt) | |
614 | { | |
615 | unsigned long value; | |
616 | #ifdef CONFIG_KALLSYMS | |
617 | char sym[KSYM_SYMBOL_LEN]; | |
618 | #endif | |
619 | ||
620 | if (fmt[1] == 'R') | |
621 | ptr = __builtin_extract_return_addr(ptr); | |
622 | value = (unsigned long)ptr; | |
623 | ||
624 | #ifdef CONFIG_KALLSYMS | |
625 | if (*fmt == 'B') | |
626 | sprint_backtrace(sym, value); | |
627 | else if (*fmt != 'f' && *fmt != 's') | |
628 | sprint_symbol(sym, value); | |
629 | else | |
630 | sprint_symbol_no_offset(sym, value); | |
631 | ||
632 | return string(buf, end, sym, spec); | |
633 | #else | |
634 | spec.field_width = 2 * sizeof(void *); | |
635 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
636 | spec.base = 16; | |
637 | ||
638 | return number(buf, end, value, spec); | |
639 | #endif | |
640 | } | |
641 | ||
642 | static noinline_for_stack | |
643 | char *resource_string(char *buf, char *end, struct resource *res, | |
644 | struct printf_spec spec, const char *fmt) | |
645 | { | |
646 | #ifndef IO_RSRC_PRINTK_SIZE | |
647 | #define IO_RSRC_PRINTK_SIZE 6 | |
648 | #endif | |
649 | ||
650 | #ifndef MEM_RSRC_PRINTK_SIZE | |
651 | #define MEM_RSRC_PRINTK_SIZE 10 | |
652 | #endif | |
653 | static const struct printf_spec io_spec = { | |
654 | .base = 16, | |
655 | .field_width = IO_RSRC_PRINTK_SIZE, | |
656 | .precision = -1, | |
657 | .flags = SPECIAL | SMALL | ZEROPAD, | |
658 | }; | |
659 | static const struct printf_spec mem_spec = { | |
660 | .base = 16, | |
661 | .field_width = MEM_RSRC_PRINTK_SIZE, | |
662 | .precision = -1, | |
663 | .flags = SPECIAL | SMALL | ZEROPAD, | |
664 | }; | |
665 | static const struct printf_spec bus_spec = { | |
666 | .base = 16, | |
667 | .field_width = 2, | |
668 | .precision = -1, | |
669 | .flags = SMALL | ZEROPAD, | |
670 | }; | |
671 | static const struct printf_spec dec_spec = { | |
672 | .base = 10, | |
673 | .precision = -1, | |
674 | .flags = 0, | |
675 | }; | |
676 | static const struct printf_spec str_spec = { | |
677 | .field_width = -1, | |
678 | .precision = 10, | |
679 | .flags = LEFT, | |
680 | }; | |
681 | static const struct printf_spec flag_spec = { | |
682 | .base = 16, | |
683 | .precision = -1, | |
684 | .flags = SPECIAL | SMALL, | |
685 | }; | |
686 | ||
687 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) | |
688 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ | |
689 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) | |
690 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) | |
691 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") | |
692 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") | |
693 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, | |
694 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; | |
695 | ||
696 | char *p = sym, *pend = sym + sizeof(sym); | |
697 | int decode = (fmt[0] == 'R') ? 1 : 0; | |
698 | const struct printf_spec *specp; | |
699 | ||
700 | *p++ = '['; | |
701 | if (res->flags & IORESOURCE_IO) { | |
702 | p = string(p, pend, "io ", str_spec); | |
703 | specp = &io_spec; | |
704 | } else if (res->flags & IORESOURCE_MEM) { | |
705 | p = string(p, pend, "mem ", str_spec); | |
706 | specp = &mem_spec; | |
707 | } else if (res->flags & IORESOURCE_IRQ) { | |
708 | p = string(p, pend, "irq ", str_spec); | |
709 | specp = &dec_spec; | |
710 | } else if (res->flags & IORESOURCE_DMA) { | |
711 | p = string(p, pend, "dma ", str_spec); | |
712 | specp = &dec_spec; | |
713 | } else if (res->flags & IORESOURCE_BUS) { | |
714 | p = string(p, pend, "bus ", str_spec); | |
715 | specp = &bus_spec; | |
716 | } else { | |
717 | p = string(p, pend, "??? ", str_spec); | |
718 | specp = &mem_spec; | |
719 | decode = 0; | |
720 | } | |
721 | if (decode && res->flags & IORESOURCE_UNSET) { | |
722 | p = string(p, pend, "size ", str_spec); | |
723 | p = number(p, pend, resource_size(res), *specp); | |
724 | } else { | |
725 | p = number(p, pend, res->start, *specp); | |
726 | if (res->start != res->end) { | |
727 | *p++ = '-'; | |
728 | p = number(p, pend, res->end, *specp); | |
729 | } | |
730 | } | |
731 | if (decode) { | |
732 | if (res->flags & IORESOURCE_MEM_64) | |
733 | p = string(p, pend, " 64bit", str_spec); | |
734 | if (res->flags & IORESOURCE_PREFETCH) | |
735 | p = string(p, pend, " pref", str_spec); | |
736 | if (res->flags & IORESOURCE_WINDOW) | |
737 | p = string(p, pend, " window", str_spec); | |
738 | if (res->flags & IORESOURCE_DISABLED) | |
739 | p = string(p, pend, " disabled", str_spec); | |
740 | } else { | |
741 | p = string(p, pend, " flags ", str_spec); | |
742 | p = number(p, pend, res->flags, flag_spec); | |
743 | } | |
744 | *p++ = ']'; | |
745 | *p = '\0'; | |
746 | ||
747 | return string(buf, end, sym, spec); | |
748 | } | |
749 | ||
750 | static noinline_for_stack | |
751 | char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
752 | const char *fmt) | |
753 | { | |
754 | int i, len = 1; /* if we pass '%ph[CDN]', field width remains | |
755 | negative value, fallback to the default */ | |
756 | char separator; | |
757 | ||
758 | if (spec.field_width == 0) | |
759 | /* nothing to print */ | |
760 | return buf; | |
761 | ||
762 | if (ZERO_OR_NULL_PTR(addr)) | |
763 | /* NULL pointer */ | |
764 | return string(buf, end, NULL, spec); | |
765 | ||
766 | switch (fmt[1]) { | |
767 | case 'C': | |
768 | separator = ':'; | |
769 | break; | |
770 | case 'D': | |
771 | separator = '-'; | |
772 | break; | |
773 | case 'N': | |
774 | separator = 0; | |
775 | break; | |
776 | default: | |
777 | separator = ' '; | |
778 | break; | |
779 | } | |
780 | ||
781 | if (spec.field_width > 0) | |
782 | len = min_t(int, spec.field_width, 64); | |
783 | ||
784 | for (i = 0; i < len && buf < end - 1; i++) { | |
785 | buf = hex_byte_pack(buf, addr[i]); | |
786 | ||
787 | if (buf < end && separator && i != len - 1) | |
788 | *buf++ = separator; | |
789 | } | |
790 | ||
791 | return buf; | |
792 | } | |
793 | ||
794 | static noinline_for_stack | |
795 | char *mac_address_string(char *buf, char *end, u8 *addr, | |
796 | struct printf_spec spec, const char *fmt) | |
797 | { | |
798 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; | |
799 | char *p = mac_addr; | |
800 | int i; | |
801 | char separator; | |
802 | bool reversed = false; | |
803 | ||
804 | switch (fmt[1]) { | |
805 | case 'F': | |
806 | separator = '-'; | |
807 | break; | |
808 | ||
809 | case 'R': | |
810 | reversed = true; | |
811 | /* fall through */ | |
812 | ||
813 | default: | |
814 | separator = ':'; | |
815 | break; | |
816 | } | |
817 | ||
818 | for (i = 0; i < 6; i++) { | |
819 | if (reversed) | |
820 | p = hex_byte_pack(p, addr[5 - i]); | |
821 | else | |
822 | p = hex_byte_pack(p, addr[i]); | |
823 | ||
824 | if (fmt[0] == 'M' && i != 5) | |
825 | *p++ = separator; | |
826 | } | |
827 | *p = '\0'; | |
828 | ||
829 | return string(buf, end, mac_addr, spec); | |
830 | } | |
831 | ||
832 | static noinline_for_stack | |
833 | char *ip4_string(char *p, const u8 *addr, const char *fmt) | |
834 | { | |
835 | int i; | |
836 | bool leading_zeros = (fmt[0] == 'i'); | |
837 | int index; | |
838 | int step; | |
839 | ||
840 | switch (fmt[2]) { | |
841 | case 'h': | |
842 | #ifdef __BIG_ENDIAN | |
843 | index = 0; | |
844 | step = 1; | |
845 | #else | |
846 | index = 3; | |
847 | step = -1; | |
848 | #endif | |
849 | break; | |
850 | case 'l': | |
851 | index = 3; | |
852 | step = -1; | |
853 | break; | |
854 | case 'n': | |
855 | case 'b': | |
856 | default: | |
857 | index = 0; | |
858 | step = 1; | |
859 | break; | |
860 | } | |
861 | for (i = 0; i < 4; i++) { | |
862 | char temp[3]; /* hold each IP quad in reverse order */ | |
863 | int digits = put_dec_trunc8(temp, addr[index]) - temp; | |
864 | if (leading_zeros) { | |
865 | if (digits < 3) | |
866 | *p++ = '0'; | |
867 | if (digits < 2) | |
868 | *p++ = '0'; | |
869 | } | |
870 | /* reverse the digits in the quad */ | |
871 | while (digits--) | |
872 | *p++ = temp[digits]; | |
873 | if (i < 3) | |
874 | *p++ = '.'; | |
875 | index += step; | |
876 | } | |
877 | *p = '\0'; | |
878 | ||
879 | return p; | |
880 | } | |
881 | ||
882 | static noinline_for_stack | |
883 | char *ip6_compressed_string(char *p, const char *addr) | |
884 | { | |
885 | int i, j, range; | |
886 | unsigned char zerolength[8]; | |
887 | int longest = 1; | |
888 | int colonpos = -1; | |
889 | u16 word; | |
890 | u8 hi, lo; | |
891 | bool needcolon = false; | |
892 | bool useIPv4; | |
893 | struct in6_addr in6; | |
894 | ||
895 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
896 | ||
897 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
898 | ||
899 | memset(zerolength, 0, sizeof(zerolength)); | |
900 | ||
901 | if (useIPv4) | |
902 | range = 6; | |
903 | else | |
904 | range = 8; | |
905 | ||
906 | /* find position of longest 0 run */ | |
907 | for (i = 0; i < range; i++) { | |
908 | for (j = i; j < range; j++) { | |
909 | if (in6.s6_addr16[j] != 0) | |
910 | break; | |
911 | zerolength[i]++; | |
912 | } | |
913 | } | |
914 | for (i = 0; i < range; i++) { | |
915 | if (zerolength[i] > longest) { | |
916 | longest = zerolength[i]; | |
917 | colonpos = i; | |
918 | } | |
919 | } | |
920 | if (longest == 1) /* don't compress a single 0 */ | |
921 | colonpos = -1; | |
922 | ||
923 | /* emit address */ | |
924 | for (i = 0; i < range; i++) { | |
925 | if (i == colonpos) { | |
926 | if (needcolon || i == 0) | |
927 | *p++ = ':'; | |
928 | *p++ = ':'; | |
929 | needcolon = false; | |
930 | i += longest - 1; | |
931 | continue; | |
932 | } | |
933 | if (needcolon) { | |
934 | *p++ = ':'; | |
935 | needcolon = false; | |
936 | } | |
937 | /* hex u16 without leading 0s */ | |
938 | word = ntohs(in6.s6_addr16[i]); | |
939 | hi = word >> 8; | |
940 | lo = word & 0xff; | |
941 | if (hi) { | |
942 | if (hi > 0x0f) | |
943 | p = hex_byte_pack(p, hi); | |
944 | else | |
945 | *p++ = hex_asc_lo(hi); | |
946 | p = hex_byte_pack(p, lo); | |
947 | } | |
948 | else if (lo > 0x0f) | |
949 | p = hex_byte_pack(p, lo); | |
950 | else | |
951 | *p++ = hex_asc_lo(lo); | |
952 | needcolon = true; | |
953 | } | |
954 | ||
955 | if (useIPv4) { | |
956 | if (needcolon) | |
957 | *p++ = ':'; | |
958 | p = ip4_string(p, &in6.s6_addr[12], "I4"); | |
959 | } | |
960 | *p = '\0'; | |
961 | ||
962 | return p; | |
963 | } | |
964 | ||
965 | static noinline_for_stack | |
966 | char *ip6_string(char *p, const char *addr, const char *fmt) | |
967 | { | |
968 | int i; | |
969 | ||
970 | for (i = 0; i < 8; i++) { | |
971 | p = hex_byte_pack(p, *addr++); | |
972 | p = hex_byte_pack(p, *addr++); | |
973 | if (fmt[0] == 'I' && i != 7) | |
974 | *p++ = ':'; | |
975 | } | |
976 | *p = '\0'; | |
977 | ||
978 | return p; | |
979 | } | |
980 | ||
981 | static noinline_for_stack | |
982 | char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
983 | struct printf_spec spec, const char *fmt) | |
984 | { | |
985 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
986 | ||
987 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
988 | ip6_compressed_string(ip6_addr, addr); | |
989 | else | |
990 | ip6_string(ip6_addr, addr, fmt); | |
991 | ||
992 | return string(buf, end, ip6_addr, spec); | |
993 | } | |
994 | ||
995 | static noinline_for_stack | |
996 | char *ip4_addr_string(char *buf, char *end, const u8 *addr, | |
997 | struct printf_spec spec, const char *fmt) | |
998 | { | |
999 | char ip4_addr[sizeof("255.255.255.255")]; | |
1000 | ||
1001 | ip4_string(ip4_addr, addr, fmt); | |
1002 | ||
1003 | return string(buf, end, ip4_addr, spec); | |
1004 | } | |
1005 | ||
1006 | static noinline_for_stack | |
1007 | char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa, | |
1008 | struct printf_spec spec, const char *fmt) | |
1009 | { | |
1010 | bool have_p = false, have_s = false, have_f = false, have_c = false; | |
1011 | char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") + | |
1012 | sizeof(":12345") + sizeof("/123456789") + | |
1013 | sizeof("%1234567890")]; | |
1014 | char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr); | |
1015 | const u8 *addr = (const u8 *) &sa->sin6_addr; | |
1016 | char fmt6[2] = { fmt[0], '6' }; | |
1017 | u8 off = 0; | |
1018 | ||
1019 | fmt++; | |
1020 | while (isalpha(*++fmt)) { | |
1021 | switch (*fmt) { | |
1022 | case 'p': | |
1023 | have_p = true; | |
1024 | break; | |
1025 | case 'f': | |
1026 | have_f = true; | |
1027 | break; | |
1028 | case 's': | |
1029 | have_s = true; | |
1030 | break; | |
1031 | case 'c': | |
1032 | have_c = true; | |
1033 | break; | |
1034 | } | |
1035 | } | |
1036 | ||
1037 | if (have_p || have_s || have_f) { | |
1038 | *p = '['; | |
1039 | off = 1; | |
1040 | } | |
1041 | ||
1042 | if (fmt6[0] == 'I' && have_c) | |
1043 | p = ip6_compressed_string(ip6_addr + off, addr); | |
1044 | else | |
1045 | p = ip6_string(ip6_addr + off, addr, fmt6); | |
1046 | ||
1047 | if (have_p || have_s || have_f) | |
1048 | *p++ = ']'; | |
1049 | ||
1050 | if (have_p) { | |
1051 | *p++ = ':'; | |
1052 | p = number(p, pend, ntohs(sa->sin6_port), spec); | |
1053 | } | |
1054 | if (have_f) { | |
1055 | *p++ = '/'; | |
1056 | p = number(p, pend, ntohl(sa->sin6_flowinfo & | |
1057 | IPV6_FLOWINFO_MASK), spec); | |
1058 | } | |
1059 | if (have_s) { | |
1060 | *p++ = '%'; | |
1061 | p = number(p, pend, sa->sin6_scope_id, spec); | |
1062 | } | |
1063 | *p = '\0'; | |
1064 | ||
1065 | return string(buf, end, ip6_addr, spec); | |
1066 | } | |
1067 | ||
1068 | static noinline_for_stack | |
1069 | char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa, | |
1070 | struct printf_spec spec, const char *fmt) | |
1071 | { | |
1072 | bool have_p = false; | |
1073 | char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")]; | |
1074 | char *pend = ip4_addr + sizeof(ip4_addr); | |
1075 | const u8 *addr = (const u8 *) &sa->sin_addr.s_addr; | |
1076 | char fmt4[3] = { fmt[0], '4', 0 }; | |
1077 | ||
1078 | fmt++; | |
1079 | while (isalpha(*++fmt)) { | |
1080 | switch (*fmt) { | |
1081 | case 'p': | |
1082 | have_p = true; | |
1083 | break; | |
1084 | case 'h': | |
1085 | case 'l': | |
1086 | case 'n': | |
1087 | case 'b': | |
1088 | fmt4[2] = *fmt; | |
1089 | break; | |
1090 | } | |
1091 | } | |
1092 | ||
1093 | p = ip4_string(ip4_addr, addr, fmt4); | |
1094 | if (have_p) { | |
1095 | *p++ = ':'; | |
1096 | p = number(p, pend, ntohs(sa->sin_port), spec); | |
1097 | } | |
1098 | *p = '\0'; | |
1099 | ||
1100 | return string(buf, end, ip4_addr, spec); | |
1101 | } | |
1102 | ||
1103 | static noinline_for_stack | |
1104 | char *uuid_string(char *buf, char *end, const u8 *addr, | |
1105 | struct printf_spec spec, const char *fmt) | |
1106 | { | |
1107 | char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; | |
1108 | char *p = uuid; | |
1109 | int i; | |
1110 | static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; | |
1111 | static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; | |
1112 | const u8 *index = be; | |
1113 | bool uc = false; | |
1114 | ||
1115 | switch (*(++fmt)) { | |
1116 | case 'L': | |
1117 | uc = true; /* fall-through */ | |
1118 | case 'l': | |
1119 | index = le; | |
1120 | break; | |
1121 | case 'B': | |
1122 | uc = true; | |
1123 | break; | |
1124 | } | |
1125 | ||
1126 | for (i = 0; i < 16; i++) { | |
1127 | p = hex_byte_pack(p, addr[index[i]]); | |
1128 | switch (i) { | |
1129 | case 3: | |
1130 | case 5: | |
1131 | case 7: | |
1132 | case 9: | |
1133 | *p++ = '-'; | |
1134 | break; | |
1135 | } | |
1136 | } | |
1137 | ||
1138 | *p = 0; | |
1139 | ||
1140 | if (uc) { | |
1141 | p = uuid; | |
1142 | do { | |
1143 | *p = toupper(*p); | |
1144 | } while (*(++p)); | |
1145 | } | |
1146 | ||
1147 | return string(buf, end, uuid, spec); | |
1148 | } | |
1149 | ||
1150 | static | |
1151 | char *netdev_feature_string(char *buf, char *end, const u8 *addr, | |
1152 | struct printf_spec spec) | |
1153 | { | |
1154 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
1155 | if (spec.field_width == -1) | |
1156 | spec.field_width = 2 + 2 * sizeof(netdev_features_t); | |
1157 | spec.base = 16; | |
1158 | ||
1159 | return number(buf, end, *(const netdev_features_t *)addr, spec); | |
1160 | } | |
1161 | ||
1162 | static noinline_for_stack | |
1163 | char *address_val(char *buf, char *end, const void *addr, | |
1164 | struct printf_spec spec, const char *fmt) | |
1165 | { | |
1166 | unsigned long long num; | |
1167 | ||
1168 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
1169 | spec.base = 16; | |
1170 | ||
1171 | switch (fmt[1]) { | |
1172 | case 'd': | |
1173 | num = *(const dma_addr_t *)addr; | |
1174 | spec.field_width = sizeof(dma_addr_t) * 2 + 2; | |
1175 | break; | |
1176 | case 'p': | |
1177 | default: | |
1178 | num = *(const phys_addr_t *)addr; | |
1179 | spec.field_width = sizeof(phys_addr_t) * 2 + 2; | |
1180 | break; | |
1181 | } | |
1182 | ||
1183 | return number(buf, end, num, spec); | |
1184 | } | |
1185 | ||
1186 | int kptr_restrict __read_mostly; | |
1187 | ||
1188 | /* | |
1189 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
1190 | * by an extra set of alphanumeric characters that are extended format | |
1191 | * specifiers. | |
1192 | * | |
1193 | * Right now we handle: | |
1194 | * | |
1195 | * - 'F' For symbolic function descriptor pointers with offset | |
1196 | * - 'f' For simple symbolic function names without offset | |
1197 | * - 'S' For symbolic direct pointers with offset | |
1198 | * - 's' For symbolic direct pointers without offset | |
1199 | * - '[FfSs]R' as above with __builtin_extract_return_addr() translation | |
1200 | * - 'B' For backtraced symbolic direct pointers with offset | |
1201 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] | |
1202 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] | |
1203 | * - 'M' For a 6-byte MAC address, it prints the address in the | |
1204 | * usual colon-separated hex notation | |
1205 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons | |
1206 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address | |
1207 | * with a dash-separated hex notation | |
1208 | * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth) | |
1209 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way | |
1210 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
1211 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
1212 | * [S][pfs] | |
1213 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1214 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
1215 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses | |
1216 | * IPv6 omits the colons (01020304...0f) | |
1217 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
1218 | * [S][pfs] | |
1219 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1220 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
1221 | * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order | |
1222 | * - 'I[6S]c' for IPv6 addresses printed as specified by | |
1223 | * http://tools.ietf.org/html/rfc5952 | |
1224 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form | |
1225 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" | |
1226 | * Options for %pU are: | |
1227 | * b big endian lower case hex (default) | |
1228 | * B big endian UPPER case hex | |
1229 | * l little endian lower case hex | |
1230 | * L little endian UPPER case hex | |
1231 | * big endian output byte order is: | |
1232 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] | |
1233 | * little endian output byte order is: | |
1234 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] | |
1235 | * - 'V' For a struct va_format which contains a format string * and va_list *, | |
1236 | * call vsnprintf(->format, *->va_list). | |
1237 | * Implements a "recursive vsnprintf". | |
1238 | * Do not use this feature without some mechanism to verify the | |
1239 | * correctness of the format string and va_list arguments. | |
1240 | * - 'K' For a kernel pointer that should be hidden from unprivileged users | |
1241 | * - 'NF' For a netdev_features_t | |
1242 | * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with | |
1243 | * a certain separator (' ' by default): | |
1244 | * C colon | |
1245 | * D dash | |
1246 | * N no separator | |
1247 | * The maximum supported length is 64 bytes of the input. Consider | |
1248 | * to use print_hex_dump() for the larger input. | |
1249 | * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives | |
1250 | * (default assumed to be phys_addr_t, passed by reference) | |
1251 | * - 'd[234]' For a dentry name (optionally 2-4 last components) | |
1252 | * - 'D[234]' Same as 'd' but for a struct file | |
1253 | * | |
1254 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 | |
1255 | * function pointers are really function descriptors, which contain a | |
1256 | * pointer to the real address. | |
1257 | */ | |
1258 | static noinline_for_stack | |
1259 | char *pointer(const char *fmt, char *buf, char *end, void *ptr, | |
1260 | struct printf_spec spec) | |
1261 | { | |
1262 | int default_width = 2 * sizeof(void *) + (spec.flags & SPECIAL ? 2 : 0); | |
1263 | ||
1264 | if (!ptr && *fmt != 'K') { | |
1265 | /* | |
1266 | * Print (null) with the same width as a pointer so it makes | |
1267 | * tabular output look nice. | |
1268 | */ | |
1269 | if (spec.field_width == -1) | |
1270 | spec.field_width = default_width; | |
1271 | return string(buf, end, "(null)", spec); | |
1272 | } | |
1273 | ||
1274 | switch (*fmt) { | |
1275 | case 'F': | |
1276 | case 'f': | |
1277 | ptr = dereference_function_descriptor(ptr); | |
1278 | /* Fallthrough */ | |
1279 | case 'S': | |
1280 | case 's': | |
1281 | case 'B': | |
1282 | return symbol_string(buf, end, ptr, spec, fmt); | |
1283 | case 'R': | |
1284 | case 'r': | |
1285 | return resource_string(buf, end, ptr, spec, fmt); | |
1286 | case 'h': | |
1287 | return hex_string(buf, end, ptr, spec, fmt); | |
1288 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ | |
1289 | case 'm': /* Contiguous: 000102030405 */ | |
1290 | /* [mM]F (FDDI) */ | |
1291 | /* [mM]R (Reverse order; Bluetooth) */ | |
1292 | return mac_address_string(buf, end, ptr, spec, fmt); | |
1293 | case 'I': /* Formatted IP supported | |
1294 | * 4: 1.2.3.4 | |
1295 | * 6: 0001:0203:...:0708 | |
1296 | * 6c: 1::708 or 1::1.2.3.4 | |
1297 | */ | |
1298 | case 'i': /* Contiguous: | |
1299 | * 4: 001.002.003.004 | |
1300 | * 6: 000102...0f | |
1301 | */ | |
1302 | switch (fmt[1]) { | |
1303 | case '6': | |
1304 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
1305 | case '4': | |
1306 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
1307 | case 'S': { | |
1308 | const union { | |
1309 | struct sockaddr raw; | |
1310 | struct sockaddr_in v4; | |
1311 | struct sockaddr_in6 v6; | |
1312 | } *sa = ptr; | |
1313 | ||
1314 | switch (sa->raw.sa_family) { | |
1315 | case AF_INET: | |
1316 | return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt); | |
1317 | case AF_INET6: | |
1318 | return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt); | |
1319 | default: | |
1320 | return string(buf, end, "(invalid address)", spec); | |
1321 | }} | |
1322 | } | |
1323 | break; | |
1324 | case 'U': | |
1325 | return uuid_string(buf, end, ptr, spec, fmt); | |
1326 | case 'V': | |
1327 | { | |
1328 | va_list va; | |
1329 | ||
1330 | va_copy(va, *((struct va_format *)ptr)->va); | |
1331 | buf += vsnprintf(buf, end > buf ? end - buf : 0, | |
1332 | ((struct va_format *)ptr)->fmt, va); | |
1333 | va_end(va); | |
1334 | return buf; | |
1335 | } | |
1336 | case 'K': | |
1337 | /* | |
1338 | * %pK cannot be used in IRQ context because its test | |
1339 | * for CAP_SYSLOG would be meaningless. | |
1340 | */ | |
1341 | if (kptr_restrict && (in_irq() || in_serving_softirq() || | |
1342 | in_nmi())) { | |
1343 | if (spec.field_width == -1) | |
1344 | spec.field_width = default_width; | |
1345 | return string(buf, end, "pK-error", spec); | |
1346 | } | |
1347 | ||
1348 | switch (kptr_restrict) { | |
1349 | case 0: | |
1350 | /* Always print %pK values */ | |
1351 | break; | |
1352 | case 1: { | |
1353 | /* | |
1354 | * Only print the real pointer value if the current | |
1355 | * process has CAP_SYSLOG and is running with the | |
1356 | * same credentials it started with. This is because | |
1357 | * access to files is checked at open() time, but %pK | |
1358 | * checks permission at read() time. We don't want to | |
1359 | * leak pointer values if a binary opens a file using | |
1360 | * %pK and then elevates privileges before reading it. | |
1361 | */ | |
1362 | const struct cred *cred = current_cred(); | |
1363 | ||
1364 | if (!has_capability_noaudit(current, CAP_SYSLOG) || | |
1365 | !uid_eq(cred->euid, cred->uid) || | |
1366 | !gid_eq(cred->egid, cred->gid)) | |
1367 | ptr = NULL; | |
1368 | break; | |
1369 | } | |
1370 | case 2: | |
1371 | default: | |
1372 | /* Always print 0's for %pK */ | |
1373 | ptr = NULL; | |
1374 | break; | |
1375 | } | |
1376 | break; | |
1377 | ||
1378 | case 'N': | |
1379 | switch (fmt[1]) { | |
1380 | case 'F': | |
1381 | return netdev_feature_string(buf, end, ptr, spec); | |
1382 | } | |
1383 | break; | |
1384 | case 'a': | |
1385 | return address_val(buf, end, ptr, spec, fmt); | |
1386 | case 'd': | |
1387 | return dentry_name(buf, end, ptr, spec, fmt); | |
1388 | case 'D': | |
1389 | return dentry_name(buf, end, | |
1390 | ((const struct file *)ptr)->f_path.dentry, | |
1391 | spec, fmt); | |
1392 | } | |
1393 | spec.flags |= SMALL; | |
1394 | if (spec.field_width == -1) { | |
1395 | spec.field_width = default_width; | |
1396 | spec.flags |= ZEROPAD; | |
1397 | } | |
1398 | spec.base = 16; | |
1399 | ||
1400 | return number(buf, end, (unsigned long) ptr, spec); | |
1401 | } | |
1402 | ||
1403 | /* | |
1404 | * Helper function to decode printf style format. | |
1405 | * Each call decode a token from the format and return the | |
1406 | * number of characters read (or likely the delta where it wants | |
1407 | * to go on the next call). | |
1408 | * The decoded token is returned through the parameters | |
1409 | * | |
1410 | * 'h', 'l', or 'L' for integer fields | |
1411 | * 'z' support added 23/7/1999 S.H. | |
1412 | * 'z' changed to 'Z' --davidm 1/25/99 | |
1413 | * 't' added for ptrdiff_t | |
1414 | * | |
1415 | * @fmt: the format string | |
1416 | * @type of the token returned | |
1417 | * @flags: various flags such as +, -, # tokens.. | |
1418 | * @field_width: overwritten width | |
1419 | * @base: base of the number (octal, hex, ...) | |
1420 | * @precision: precision of a number | |
1421 | * @qualifier: qualifier of a number (long, size_t, ...) | |
1422 | */ | |
1423 | static noinline_for_stack | |
1424 | int format_decode(const char *fmt, struct printf_spec *spec) | |
1425 | { | |
1426 | const char *start = fmt; | |
1427 | ||
1428 | /* we finished early by reading the field width */ | |
1429 | if (spec->type == FORMAT_TYPE_WIDTH) { | |
1430 | if (spec->field_width < 0) { | |
1431 | spec->field_width = -spec->field_width; | |
1432 | spec->flags |= LEFT; | |
1433 | } | |
1434 | spec->type = FORMAT_TYPE_NONE; | |
1435 | goto precision; | |
1436 | } | |
1437 | ||
1438 | /* we finished early by reading the precision */ | |
1439 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
1440 | if (spec->precision < 0) | |
1441 | spec->precision = 0; | |
1442 | ||
1443 | spec->type = FORMAT_TYPE_NONE; | |
1444 | goto qualifier; | |
1445 | } | |
1446 | ||
1447 | /* By default */ | |
1448 | spec->type = FORMAT_TYPE_NONE; | |
1449 | ||
1450 | for (; *fmt ; ++fmt) { | |
1451 | if (*fmt == '%') | |
1452 | break; | |
1453 | } | |
1454 | ||
1455 | /* Return the current non-format string */ | |
1456 | if (fmt != start || !*fmt) | |
1457 | return fmt - start; | |
1458 | ||
1459 | /* Process flags */ | |
1460 | spec->flags = 0; | |
1461 | ||
1462 | while (1) { /* this also skips first '%' */ | |
1463 | bool found = true; | |
1464 | ||
1465 | ++fmt; | |
1466 | ||
1467 | switch (*fmt) { | |
1468 | case '-': spec->flags |= LEFT; break; | |
1469 | case '+': spec->flags |= PLUS; break; | |
1470 | case ' ': spec->flags |= SPACE; break; | |
1471 | case '#': spec->flags |= SPECIAL; break; | |
1472 | case '0': spec->flags |= ZEROPAD; break; | |
1473 | default: found = false; | |
1474 | } | |
1475 | ||
1476 | if (!found) | |
1477 | break; | |
1478 | } | |
1479 | ||
1480 | /* get field width */ | |
1481 | spec->field_width = -1; | |
1482 | ||
1483 | if (isdigit(*fmt)) | |
1484 | spec->field_width = skip_atoi(&fmt); | |
1485 | else if (*fmt == '*') { | |
1486 | /* it's the next argument */ | |
1487 | spec->type = FORMAT_TYPE_WIDTH; | |
1488 | return ++fmt - start; | |
1489 | } | |
1490 | ||
1491 | precision: | |
1492 | /* get the precision */ | |
1493 | spec->precision = -1; | |
1494 | if (*fmt == '.') { | |
1495 | ++fmt; | |
1496 | if (isdigit(*fmt)) { | |
1497 | spec->precision = skip_atoi(&fmt); | |
1498 | if (spec->precision < 0) | |
1499 | spec->precision = 0; | |
1500 | } else if (*fmt == '*') { | |
1501 | /* it's the next argument */ | |
1502 | spec->type = FORMAT_TYPE_PRECISION; | |
1503 | return ++fmt - start; | |
1504 | } | |
1505 | } | |
1506 | ||
1507 | qualifier: | |
1508 | /* get the conversion qualifier */ | |
1509 | spec->qualifier = -1; | |
1510 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || | |
1511 | _tolower(*fmt) == 'z' || *fmt == 't') { | |
1512 | spec->qualifier = *fmt++; | |
1513 | if (unlikely(spec->qualifier == *fmt)) { | |
1514 | if (spec->qualifier == 'l') { | |
1515 | spec->qualifier = 'L'; | |
1516 | ++fmt; | |
1517 | } else if (spec->qualifier == 'h') { | |
1518 | spec->qualifier = 'H'; | |
1519 | ++fmt; | |
1520 | } | |
1521 | } | |
1522 | } | |
1523 | ||
1524 | /* default base */ | |
1525 | spec->base = 10; | |
1526 | switch (*fmt) { | |
1527 | case 'c': | |
1528 | spec->type = FORMAT_TYPE_CHAR; | |
1529 | return ++fmt - start; | |
1530 | ||
1531 | case 's': | |
1532 | spec->type = FORMAT_TYPE_STR; | |
1533 | return ++fmt - start; | |
1534 | ||
1535 | case 'p': | |
1536 | spec->type = FORMAT_TYPE_PTR; | |
1537 | return fmt - start; | |
1538 | /* skip alnum */ | |
1539 | ||
1540 | case '%': | |
1541 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
1542 | return ++fmt - start; | |
1543 | ||
1544 | /* integer number formats - set up the flags and "break" */ | |
1545 | case 'o': | |
1546 | spec->base = 8; | |
1547 | break; | |
1548 | ||
1549 | case 'x': | |
1550 | spec->flags |= SMALL; | |
1551 | ||
1552 | case 'X': | |
1553 | spec->base = 16; | |
1554 | break; | |
1555 | ||
1556 | case 'd': | |
1557 | case 'i': | |
1558 | spec->flags |= SIGN; | |
1559 | case 'u': | |
1560 | break; | |
1561 | ||
1562 | case 'n': | |
1563 | /* | |
1564 | * Since %n poses a greater security risk than utility, treat | |
1565 | * it as an invalid format specifier. Warn about its use so | |
1566 | * that new instances don't get added. | |
1567 | */ | |
1568 | WARN_ONCE(1, "Please remove ignored %%n in '%s'\n", fmt); | |
1569 | /* Fall-through */ | |
1570 | ||
1571 | default: | |
1572 | spec->type = FORMAT_TYPE_INVALID; | |
1573 | return fmt - start; | |
1574 | } | |
1575 | ||
1576 | if (spec->qualifier == 'L') | |
1577 | spec->type = FORMAT_TYPE_LONG_LONG; | |
1578 | else if (spec->qualifier == 'l') { | |
1579 | if (spec->flags & SIGN) | |
1580 | spec->type = FORMAT_TYPE_LONG; | |
1581 | else | |
1582 | spec->type = FORMAT_TYPE_ULONG; | |
1583 | } else if (_tolower(spec->qualifier) == 'z') { | |
1584 | spec->type = FORMAT_TYPE_SIZE_T; | |
1585 | } else if (spec->qualifier == 't') { | |
1586 | spec->type = FORMAT_TYPE_PTRDIFF; | |
1587 | } else if (spec->qualifier == 'H') { | |
1588 | if (spec->flags & SIGN) | |
1589 | spec->type = FORMAT_TYPE_BYTE; | |
1590 | else | |
1591 | spec->type = FORMAT_TYPE_UBYTE; | |
1592 | } else if (spec->qualifier == 'h') { | |
1593 | if (spec->flags & SIGN) | |
1594 | spec->type = FORMAT_TYPE_SHORT; | |
1595 | else | |
1596 | spec->type = FORMAT_TYPE_USHORT; | |
1597 | } else { | |
1598 | if (spec->flags & SIGN) | |
1599 | spec->type = FORMAT_TYPE_INT; | |
1600 | else | |
1601 | spec->type = FORMAT_TYPE_UINT; | |
1602 | } | |
1603 | ||
1604 | return ++fmt - start; | |
1605 | } | |
1606 | ||
1607 | /** | |
1608 | * vsnprintf - Format a string and place it in a buffer | |
1609 | * @buf: The buffer to place the result into | |
1610 | * @size: The size of the buffer, including the trailing null space | |
1611 | * @fmt: The format string to use | |
1612 | * @args: Arguments for the format string | |
1613 | * | |
1614 | * This function follows C99 vsnprintf, but has some extensions: | |
1615 | * %pS output the name of a text symbol with offset | |
1616 | * %ps output the name of a text symbol without offset | |
1617 | * %pF output the name of a function pointer with its offset | |
1618 | * %pf output the name of a function pointer without its offset | |
1619 | * %pB output the name of a backtrace symbol with its offset | |
1620 | * %pR output the address range in a struct resource with decoded flags | |
1621 | * %pr output the address range in a struct resource with raw flags | |
1622 | * %pM output a 6-byte MAC address with colons | |
1623 | * %pMR output a 6-byte MAC address with colons in reversed order | |
1624 | * %pMF output a 6-byte MAC address with dashes | |
1625 | * %pm output a 6-byte MAC address without colons | |
1626 | * %pmR output a 6-byte MAC address without colons in reversed order | |
1627 | * %pI4 print an IPv4 address without leading zeros | |
1628 | * %pi4 print an IPv4 address with leading zeros | |
1629 | * %pI6 print an IPv6 address with colons | |
1630 | * %pi6 print an IPv6 address without colons | |
1631 | * %pI6c print an IPv6 address as specified by RFC 5952 | |
1632 | * %pIS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address | |
1633 | * %piS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address | |
1634 | * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper | |
1635 | * case. | |
1636 | * %*ph[CDN] a variable-length hex string with a separator (supports up to 64 | |
1637 | * bytes of the input) | |
1638 | * %n is ignored | |
1639 | * | |
1640 | * ** Please update Documentation/printk-formats.txt when making changes ** | |
1641 | * | |
1642 | * The return value is the number of characters which would | |
1643 | * be generated for the given input, excluding the trailing | |
1644 | * '\0', as per ISO C99. If you want to have the exact | |
1645 | * number of characters written into @buf as return value | |
1646 | * (not including the trailing '\0'), use vscnprintf(). If the | |
1647 | * return is greater than or equal to @size, the resulting | |
1648 | * string is truncated. | |
1649 | * | |
1650 | * If you're not already dealing with a va_list consider using snprintf(). | |
1651 | */ | |
1652 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1653 | { | |
1654 | unsigned long long num; | |
1655 | char *str, *end; | |
1656 | struct printf_spec spec = {0}; | |
1657 | ||
1658 | /* Reject out-of-range values early. Large positive sizes are | |
1659 | used for unknown buffer sizes. */ | |
1660 | if (WARN_ON_ONCE((int) size < 0)) | |
1661 | return 0; | |
1662 | ||
1663 | str = buf; | |
1664 | end = buf + size; | |
1665 | ||
1666 | /* Make sure end is always >= buf */ | |
1667 | if (end < buf) { | |
1668 | end = ((void *)-1); | |
1669 | size = end - buf; | |
1670 | } | |
1671 | ||
1672 | while (*fmt) { | |
1673 | const char *old_fmt = fmt; | |
1674 | int read = format_decode(fmt, &spec); | |
1675 | ||
1676 | fmt += read; | |
1677 | ||
1678 | switch (spec.type) { | |
1679 | case FORMAT_TYPE_NONE: { | |
1680 | int copy = read; | |
1681 | if (str < end) { | |
1682 | if (copy > end - str) | |
1683 | copy = end - str; | |
1684 | memcpy(str, old_fmt, copy); | |
1685 | } | |
1686 | str += read; | |
1687 | break; | |
1688 | } | |
1689 | ||
1690 | case FORMAT_TYPE_WIDTH: | |
1691 | spec.field_width = va_arg(args, int); | |
1692 | break; | |
1693 | ||
1694 | case FORMAT_TYPE_PRECISION: | |
1695 | spec.precision = va_arg(args, int); | |
1696 | break; | |
1697 | ||
1698 | case FORMAT_TYPE_CHAR: { | |
1699 | char c; | |
1700 | ||
1701 | if (!(spec.flags & LEFT)) { | |
1702 | while (--spec.field_width > 0) { | |
1703 | if (str < end) | |
1704 | *str = ' '; | |
1705 | ++str; | |
1706 | ||
1707 | } | |
1708 | } | |
1709 | c = (unsigned char) va_arg(args, int); | |
1710 | if (str < end) | |
1711 | *str = c; | |
1712 | ++str; | |
1713 | while (--spec.field_width > 0) { | |
1714 | if (str < end) | |
1715 | *str = ' '; | |
1716 | ++str; | |
1717 | } | |
1718 | break; | |
1719 | } | |
1720 | ||
1721 | case FORMAT_TYPE_STR: | |
1722 | str = string(str, end, va_arg(args, char *), spec); | |
1723 | break; | |
1724 | ||
1725 | case FORMAT_TYPE_PTR: | |
1726 | str = pointer(fmt+1, str, end, va_arg(args, void *), | |
1727 | spec); | |
1728 | while (isalnum(*fmt)) | |
1729 | fmt++; | |
1730 | break; | |
1731 | ||
1732 | case FORMAT_TYPE_PERCENT_CHAR: | |
1733 | if (str < end) | |
1734 | *str = '%'; | |
1735 | ++str; | |
1736 | break; | |
1737 | ||
1738 | case FORMAT_TYPE_INVALID: | |
1739 | if (str < end) | |
1740 | *str = '%'; | |
1741 | ++str; | |
1742 | break; | |
1743 | ||
1744 | default: | |
1745 | switch (spec.type) { | |
1746 | case FORMAT_TYPE_LONG_LONG: | |
1747 | num = va_arg(args, long long); | |
1748 | break; | |
1749 | case FORMAT_TYPE_ULONG: | |
1750 | num = va_arg(args, unsigned long); | |
1751 | break; | |
1752 | case FORMAT_TYPE_LONG: | |
1753 | num = va_arg(args, long); | |
1754 | break; | |
1755 | case FORMAT_TYPE_SIZE_T: | |
1756 | if (spec.flags & SIGN) | |
1757 | num = va_arg(args, ssize_t); | |
1758 | else | |
1759 | num = va_arg(args, size_t); | |
1760 | break; | |
1761 | case FORMAT_TYPE_PTRDIFF: | |
1762 | num = va_arg(args, ptrdiff_t); | |
1763 | break; | |
1764 | case FORMAT_TYPE_UBYTE: | |
1765 | num = (unsigned char) va_arg(args, int); | |
1766 | break; | |
1767 | case FORMAT_TYPE_BYTE: | |
1768 | num = (signed char) va_arg(args, int); | |
1769 | break; | |
1770 | case FORMAT_TYPE_USHORT: | |
1771 | num = (unsigned short) va_arg(args, int); | |
1772 | break; | |
1773 | case FORMAT_TYPE_SHORT: | |
1774 | num = (short) va_arg(args, int); | |
1775 | break; | |
1776 | case FORMAT_TYPE_INT: | |
1777 | num = (int) va_arg(args, int); | |
1778 | break; | |
1779 | default: | |
1780 | num = va_arg(args, unsigned int); | |
1781 | } | |
1782 | ||
1783 | str = number(str, end, num, spec); | |
1784 | } | |
1785 | } | |
1786 | ||
1787 | if (size > 0) { | |
1788 | if (str < end) | |
1789 | *str = '\0'; | |
1790 | else | |
1791 | end[-1] = '\0'; | |
1792 | } | |
1793 | ||
1794 | /* the trailing null byte doesn't count towards the total */ | |
1795 | return str-buf; | |
1796 | ||
1797 | } | |
1798 | EXPORT_SYMBOL(vsnprintf); | |
1799 | ||
1800 | /** | |
1801 | * vscnprintf - Format a string and place it in a buffer | |
1802 | * @buf: The buffer to place the result into | |
1803 | * @size: The size of the buffer, including the trailing null space | |
1804 | * @fmt: The format string to use | |
1805 | * @args: Arguments for the format string | |
1806 | * | |
1807 | * The return value is the number of characters which have been written into | |
1808 | * the @buf not including the trailing '\0'. If @size is == 0 the function | |
1809 | * returns 0. | |
1810 | * | |
1811 | * If you're not already dealing with a va_list consider using scnprintf(). | |
1812 | * | |
1813 | * See the vsnprintf() documentation for format string extensions over C99. | |
1814 | */ | |
1815 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1816 | { | |
1817 | int i; | |
1818 | ||
1819 | i = vsnprintf(buf, size, fmt, args); | |
1820 | ||
1821 | if (likely(i < size)) | |
1822 | return i; | |
1823 | if (size != 0) | |
1824 | return size - 1; | |
1825 | return 0; | |
1826 | } | |
1827 | EXPORT_SYMBOL(vscnprintf); | |
1828 | ||
1829 | /** | |
1830 | * snprintf - Format a string and place it in a buffer | |
1831 | * @buf: The buffer to place the result into | |
1832 | * @size: The size of the buffer, including the trailing null space | |
1833 | * @fmt: The format string to use | |
1834 | * @...: Arguments for the format string | |
1835 | * | |
1836 | * The return value is the number of characters which would be | |
1837 | * generated for the given input, excluding the trailing null, | |
1838 | * as per ISO C99. If the return is greater than or equal to | |
1839 | * @size, the resulting string is truncated. | |
1840 | * | |
1841 | * See the vsnprintf() documentation for format string extensions over C99. | |
1842 | */ | |
1843 | int snprintf(char *buf, size_t size, const char *fmt, ...) | |
1844 | { | |
1845 | va_list args; | |
1846 | int i; | |
1847 | ||
1848 | va_start(args, fmt); | |
1849 | i = vsnprintf(buf, size, fmt, args); | |
1850 | va_end(args); | |
1851 | ||
1852 | return i; | |
1853 | } | |
1854 | EXPORT_SYMBOL(snprintf); | |
1855 | ||
1856 | /** | |
1857 | * scnprintf - Format a string and place it in a buffer | |
1858 | * @buf: The buffer to place the result into | |
1859 | * @size: The size of the buffer, including the trailing null space | |
1860 | * @fmt: The format string to use | |
1861 | * @...: Arguments for the format string | |
1862 | * | |
1863 | * The return value is the number of characters written into @buf not including | |
1864 | * the trailing '\0'. If @size is == 0 the function returns 0. | |
1865 | */ | |
1866 | ||
1867 | int scnprintf(char *buf, size_t size, const char *fmt, ...) | |
1868 | { | |
1869 | va_list args; | |
1870 | int i; | |
1871 | ||
1872 | va_start(args, fmt); | |
1873 | i = vscnprintf(buf, size, fmt, args); | |
1874 | va_end(args); | |
1875 | ||
1876 | return i; | |
1877 | } | |
1878 | EXPORT_SYMBOL(scnprintf); | |
1879 | ||
1880 | /** | |
1881 | * vsprintf - Format a string and place it in a buffer | |
1882 | * @buf: The buffer to place the result into | |
1883 | * @fmt: The format string to use | |
1884 | * @args: Arguments for the format string | |
1885 | * | |
1886 | * The function returns the number of characters written | |
1887 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid | |
1888 | * buffer overflows. | |
1889 | * | |
1890 | * If you're not already dealing with a va_list consider using sprintf(). | |
1891 | * | |
1892 | * See the vsnprintf() documentation for format string extensions over C99. | |
1893 | */ | |
1894 | int vsprintf(char *buf, const char *fmt, va_list args) | |
1895 | { | |
1896 | return vsnprintf(buf, INT_MAX, fmt, args); | |
1897 | } | |
1898 | EXPORT_SYMBOL(vsprintf); | |
1899 | ||
1900 | /** | |
1901 | * sprintf - Format a string and place it in a buffer | |
1902 | * @buf: The buffer to place the result into | |
1903 | * @fmt: The format string to use | |
1904 | * @...: Arguments for the format string | |
1905 | * | |
1906 | * The function returns the number of characters written | |
1907 | * into @buf. Use snprintf() or scnprintf() in order to avoid | |
1908 | * buffer overflows. | |
1909 | * | |
1910 | * See the vsnprintf() documentation for format string extensions over C99. | |
1911 | */ | |
1912 | int sprintf(char *buf, const char *fmt, ...) | |
1913 | { | |
1914 | va_list args; | |
1915 | int i; | |
1916 | ||
1917 | va_start(args, fmt); | |
1918 | i = vsnprintf(buf, INT_MAX, fmt, args); | |
1919 | va_end(args); | |
1920 | ||
1921 | return i; | |
1922 | } | |
1923 | EXPORT_SYMBOL(sprintf); | |
1924 | ||
1925 | #ifdef CONFIG_BINARY_PRINTF | |
1926 | /* | |
1927 | * bprintf service: | |
1928 | * vbin_printf() - VA arguments to binary data | |
1929 | * bstr_printf() - Binary data to text string | |
1930 | */ | |
1931 | ||
1932 | /** | |
1933 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
1934 | * @bin_buf: The buffer to place args' binary value | |
1935 | * @size: The size of the buffer(by words(32bits), not characters) | |
1936 | * @fmt: The format string to use | |
1937 | * @args: Arguments for the format string | |
1938 | * | |
1939 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
1940 | * is skiped. | |
1941 | * | |
1942 | * The return value is the number of words(32bits) which would be generated for | |
1943 | * the given input. | |
1944 | * | |
1945 | * NOTE: | |
1946 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
1947 | * valid for bstr_printf(). | |
1948 | */ | |
1949 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
1950 | { | |
1951 | struct printf_spec spec = {0}; | |
1952 | char *str, *end; | |
1953 | ||
1954 | str = (char *)bin_buf; | |
1955 | end = (char *)(bin_buf + size); | |
1956 | ||
1957 | #define save_arg(type) \ | |
1958 | do { \ | |
1959 | if (sizeof(type) == 8) { \ | |
1960 | unsigned long long value; \ | |
1961 | str = PTR_ALIGN(str, sizeof(u32)); \ | |
1962 | value = va_arg(args, unsigned long long); \ | |
1963 | if (str + sizeof(type) <= end) { \ | |
1964 | *(u32 *)str = *(u32 *)&value; \ | |
1965 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ | |
1966 | } \ | |
1967 | } else { \ | |
1968 | unsigned long value; \ | |
1969 | str = PTR_ALIGN(str, sizeof(type)); \ | |
1970 | value = va_arg(args, int); \ | |
1971 | if (str + sizeof(type) <= end) \ | |
1972 | *(typeof(type) *)str = (type)value; \ | |
1973 | } \ | |
1974 | str += sizeof(type); \ | |
1975 | } while (0) | |
1976 | ||
1977 | while (*fmt) { | |
1978 | int read = format_decode(fmt, &spec); | |
1979 | ||
1980 | fmt += read; | |
1981 | ||
1982 | switch (spec.type) { | |
1983 | case FORMAT_TYPE_NONE: | |
1984 | case FORMAT_TYPE_INVALID: | |
1985 | case FORMAT_TYPE_PERCENT_CHAR: | |
1986 | break; | |
1987 | ||
1988 | case FORMAT_TYPE_WIDTH: | |
1989 | case FORMAT_TYPE_PRECISION: | |
1990 | save_arg(int); | |
1991 | break; | |
1992 | ||
1993 | case FORMAT_TYPE_CHAR: | |
1994 | save_arg(char); | |
1995 | break; | |
1996 | ||
1997 | case FORMAT_TYPE_STR: { | |
1998 | const char *save_str = va_arg(args, char *); | |
1999 | size_t len; | |
2000 | ||
2001 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE | |
2002 | || (unsigned long)save_str < PAGE_SIZE) | |
2003 | save_str = "(null)"; | |
2004 | len = strlen(save_str) + 1; | |
2005 | if (str + len < end) | |
2006 | memcpy(str, save_str, len); | |
2007 | str += len; | |
2008 | break; | |
2009 | } | |
2010 | ||
2011 | case FORMAT_TYPE_PTR: | |
2012 | save_arg(void *); | |
2013 | /* skip all alphanumeric pointer suffixes */ | |
2014 | while (isalnum(*fmt)) | |
2015 | fmt++; | |
2016 | break; | |
2017 | ||
2018 | default: | |
2019 | switch (spec.type) { | |
2020 | ||
2021 | case FORMAT_TYPE_LONG_LONG: | |
2022 | save_arg(long long); | |
2023 | break; | |
2024 | case FORMAT_TYPE_ULONG: | |
2025 | case FORMAT_TYPE_LONG: | |
2026 | save_arg(unsigned long); | |
2027 | break; | |
2028 | case FORMAT_TYPE_SIZE_T: | |
2029 | save_arg(size_t); | |
2030 | break; | |
2031 | case FORMAT_TYPE_PTRDIFF: | |
2032 | save_arg(ptrdiff_t); | |
2033 | break; | |
2034 | case FORMAT_TYPE_UBYTE: | |
2035 | case FORMAT_TYPE_BYTE: | |
2036 | save_arg(char); | |
2037 | break; | |
2038 | case FORMAT_TYPE_USHORT: | |
2039 | case FORMAT_TYPE_SHORT: | |
2040 | save_arg(short); | |
2041 | break; | |
2042 | default: | |
2043 | save_arg(int); | |
2044 | } | |
2045 | } | |
2046 | } | |
2047 | ||
2048 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; | |
2049 | #undef save_arg | |
2050 | } | |
2051 | EXPORT_SYMBOL_GPL(vbin_printf); | |
2052 | ||
2053 | /** | |
2054 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
2055 | * @buf: The buffer to place the result into | |
2056 | * @size: The size of the buffer, including the trailing null space | |
2057 | * @fmt: The format string to use | |
2058 | * @bin_buf: Binary arguments for the format string | |
2059 | * | |
2060 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
2061 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
2062 | * a binary buffer that generated by vbin_printf. | |
2063 | * | |
2064 | * The format follows C99 vsnprintf, but has some extensions: | |
2065 | * see vsnprintf comment for details. | |
2066 | * | |
2067 | * The return value is the number of characters which would | |
2068 | * be generated for the given input, excluding the trailing | |
2069 | * '\0', as per ISO C99. If you want to have the exact | |
2070 | * number of characters written into @buf as return value | |
2071 | * (not including the trailing '\0'), use vscnprintf(). If the | |
2072 | * return is greater than or equal to @size, the resulting | |
2073 | * string is truncated. | |
2074 | */ | |
2075 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
2076 | { | |
2077 | struct printf_spec spec = {0}; | |
2078 | char *str, *end; | |
2079 | const char *args = (const char *)bin_buf; | |
2080 | ||
2081 | if (WARN_ON_ONCE((int) size < 0)) | |
2082 | return 0; | |
2083 | ||
2084 | str = buf; | |
2085 | end = buf + size; | |
2086 | ||
2087 | #define get_arg(type) \ | |
2088 | ({ \ | |
2089 | typeof(type) value; \ | |
2090 | if (sizeof(type) == 8) { \ | |
2091 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
2092 | *(u32 *)&value = *(u32 *)args; \ | |
2093 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
2094 | } else { \ | |
2095 | args = PTR_ALIGN(args, sizeof(type)); \ | |
2096 | value = *(typeof(type) *)args; \ | |
2097 | } \ | |
2098 | args += sizeof(type); \ | |
2099 | value; \ | |
2100 | }) | |
2101 | ||
2102 | /* Make sure end is always >= buf */ | |
2103 | if (end < buf) { | |
2104 | end = ((void *)-1); | |
2105 | size = end - buf; | |
2106 | } | |
2107 | ||
2108 | while (*fmt) { | |
2109 | const char *old_fmt = fmt; | |
2110 | int read = format_decode(fmt, &spec); | |
2111 | ||
2112 | fmt += read; | |
2113 | ||
2114 | switch (spec.type) { | |
2115 | case FORMAT_TYPE_NONE: { | |
2116 | int copy = read; | |
2117 | if (str < end) { | |
2118 | if (copy > end - str) | |
2119 | copy = end - str; | |
2120 | memcpy(str, old_fmt, copy); | |
2121 | } | |
2122 | str += read; | |
2123 | break; | |
2124 | } | |
2125 | ||
2126 | case FORMAT_TYPE_WIDTH: | |
2127 | spec.field_width = get_arg(int); | |
2128 | break; | |
2129 | ||
2130 | case FORMAT_TYPE_PRECISION: | |
2131 | spec.precision = get_arg(int); | |
2132 | break; | |
2133 | ||
2134 | case FORMAT_TYPE_CHAR: { | |
2135 | char c; | |
2136 | ||
2137 | if (!(spec.flags & LEFT)) { | |
2138 | while (--spec.field_width > 0) { | |
2139 | if (str < end) | |
2140 | *str = ' '; | |
2141 | ++str; | |
2142 | } | |
2143 | } | |
2144 | c = (unsigned char) get_arg(char); | |
2145 | if (str < end) | |
2146 | *str = c; | |
2147 | ++str; | |
2148 | while (--spec.field_width > 0) { | |
2149 | if (str < end) | |
2150 | *str = ' '; | |
2151 | ++str; | |
2152 | } | |
2153 | break; | |
2154 | } | |
2155 | ||
2156 | case FORMAT_TYPE_STR: { | |
2157 | const char *str_arg = args; | |
2158 | args += strlen(str_arg) + 1; | |
2159 | str = string(str, end, (char *)str_arg, spec); | |
2160 | break; | |
2161 | } | |
2162 | ||
2163 | case FORMAT_TYPE_PTR: | |
2164 | str = pointer(fmt+1, str, end, get_arg(void *), spec); | |
2165 | while (isalnum(*fmt)) | |
2166 | fmt++; | |
2167 | break; | |
2168 | ||
2169 | case FORMAT_TYPE_PERCENT_CHAR: | |
2170 | case FORMAT_TYPE_INVALID: | |
2171 | if (str < end) | |
2172 | *str = '%'; | |
2173 | ++str; | |
2174 | break; | |
2175 | ||
2176 | default: { | |
2177 | unsigned long long num; | |
2178 | ||
2179 | switch (spec.type) { | |
2180 | ||
2181 | case FORMAT_TYPE_LONG_LONG: | |
2182 | num = get_arg(long long); | |
2183 | break; | |
2184 | case FORMAT_TYPE_ULONG: | |
2185 | case FORMAT_TYPE_LONG: | |
2186 | num = get_arg(unsigned long); | |
2187 | break; | |
2188 | case FORMAT_TYPE_SIZE_T: | |
2189 | num = get_arg(size_t); | |
2190 | break; | |
2191 | case FORMAT_TYPE_PTRDIFF: | |
2192 | num = get_arg(ptrdiff_t); | |
2193 | break; | |
2194 | case FORMAT_TYPE_UBYTE: | |
2195 | num = get_arg(unsigned char); | |
2196 | break; | |
2197 | case FORMAT_TYPE_BYTE: | |
2198 | num = get_arg(signed char); | |
2199 | break; | |
2200 | case FORMAT_TYPE_USHORT: | |
2201 | num = get_arg(unsigned short); | |
2202 | break; | |
2203 | case FORMAT_TYPE_SHORT: | |
2204 | num = get_arg(short); | |
2205 | break; | |
2206 | case FORMAT_TYPE_UINT: | |
2207 | num = get_arg(unsigned int); | |
2208 | break; | |
2209 | default: | |
2210 | num = get_arg(int); | |
2211 | } | |
2212 | ||
2213 | str = number(str, end, num, spec); | |
2214 | } /* default: */ | |
2215 | } /* switch(spec.type) */ | |
2216 | } /* while(*fmt) */ | |
2217 | ||
2218 | if (size > 0) { | |
2219 | if (str < end) | |
2220 | *str = '\0'; | |
2221 | else | |
2222 | end[-1] = '\0'; | |
2223 | } | |
2224 | ||
2225 | #undef get_arg | |
2226 | ||
2227 | /* the trailing null byte doesn't count towards the total */ | |
2228 | return str - buf; | |
2229 | } | |
2230 | EXPORT_SYMBOL_GPL(bstr_printf); | |
2231 | ||
2232 | /** | |
2233 | * bprintf - Parse a format string and place args' binary value in a buffer | |
2234 | * @bin_buf: The buffer to place args' binary value | |
2235 | * @size: The size of the buffer(by words(32bits), not characters) | |
2236 | * @fmt: The format string to use | |
2237 | * @...: Arguments for the format string | |
2238 | * | |
2239 | * The function returns the number of words(u32) written | |
2240 | * into @bin_buf. | |
2241 | */ | |
2242 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
2243 | { | |
2244 | va_list args; | |
2245 | int ret; | |
2246 | ||
2247 | va_start(args, fmt); | |
2248 | ret = vbin_printf(bin_buf, size, fmt, args); | |
2249 | va_end(args); | |
2250 | ||
2251 | return ret; | |
2252 | } | |
2253 | EXPORT_SYMBOL_GPL(bprintf); | |
2254 | ||
2255 | #endif /* CONFIG_BINARY_PRINTF */ | |
2256 | ||
2257 | /** | |
2258 | * vsscanf - Unformat a buffer into a list of arguments | |
2259 | * @buf: input buffer | |
2260 | * @fmt: format of buffer | |
2261 | * @args: arguments | |
2262 | */ | |
2263 | int vsscanf(const char *buf, const char *fmt, va_list args) | |
2264 | { | |
2265 | const char *str = buf; | |
2266 | char *next; | |
2267 | char digit; | |
2268 | int num = 0; | |
2269 | u8 qualifier; | |
2270 | unsigned int base; | |
2271 | union { | |
2272 | long long s; | |
2273 | unsigned long long u; | |
2274 | } val; | |
2275 | s16 field_width; | |
2276 | bool is_sign; | |
2277 | ||
2278 | while (*fmt) { | |
2279 | /* skip any white space in format */ | |
2280 | /* white space in format matchs any amount of | |
2281 | * white space, including none, in the input. | |
2282 | */ | |
2283 | if (isspace(*fmt)) { | |
2284 | fmt = skip_spaces(++fmt); | |
2285 | str = skip_spaces(str); | |
2286 | } | |
2287 | ||
2288 | /* anything that is not a conversion must match exactly */ | |
2289 | if (*fmt != '%' && *fmt) { | |
2290 | if (*fmt++ != *str++) | |
2291 | break; | |
2292 | continue; | |
2293 | } | |
2294 | ||
2295 | if (!*fmt) | |
2296 | break; | |
2297 | ++fmt; | |
2298 | ||
2299 | /* skip this conversion. | |
2300 | * advance both strings to next white space | |
2301 | */ | |
2302 | if (*fmt == '*') { | |
2303 | if (!*str) | |
2304 | break; | |
2305 | while (!isspace(*fmt) && *fmt != '%' && *fmt) | |
2306 | fmt++; | |
2307 | while (!isspace(*str) && *str) | |
2308 | str++; | |
2309 | continue; | |
2310 | } | |
2311 | ||
2312 | /* get field width */ | |
2313 | field_width = -1; | |
2314 | if (isdigit(*fmt)) { | |
2315 | field_width = skip_atoi(&fmt); | |
2316 | if (field_width <= 0) | |
2317 | break; | |
2318 | } | |
2319 | ||
2320 | /* get conversion qualifier */ | |
2321 | qualifier = -1; | |
2322 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || | |
2323 | _tolower(*fmt) == 'z') { | |
2324 | qualifier = *fmt++; | |
2325 | if (unlikely(qualifier == *fmt)) { | |
2326 | if (qualifier == 'h') { | |
2327 | qualifier = 'H'; | |
2328 | fmt++; | |
2329 | } else if (qualifier == 'l') { | |
2330 | qualifier = 'L'; | |
2331 | fmt++; | |
2332 | } | |
2333 | } | |
2334 | } | |
2335 | ||
2336 | if (!*fmt) | |
2337 | break; | |
2338 | ||
2339 | if (*fmt == 'n') { | |
2340 | /* return number of characters read so far */ | |
2341 | *va_arg(args, int *) = str - buf; | |
2342 | ++fmt; | |
2343 | continue; | |
2344 | } | |
2345 | ||
2346 | if (!*str) | |
2347 | break; | |
2348 | ||
2349 | base = 10; | |
2350 | is_sign = 0; | |
2351 | ||
2352 | switch (*fmt++) { | |
2353 | case 'c': | |
2354 | { | |
2355 | char *s = (char *)va_arg(args, char*); | |
2356 | if (field_width == -1) | |
2357 | field_width = 1; | |
2358 | do { | |
2359 | *s++ = *str++; | |
2360 | } while (--field_width > 0 && *str); | |
2361 | num++; | |
2362 | } | |
2363 | continue; | |
2364 | case 's': | |
2365 | { | |
2366 | char *s = (char *)va_arg(args, char *); | |
2367 | if (field_width == -1) | |
2368 | field_width = SHRT_MAX; | |
2369 | /* first, skip leading white space in buffer */ | |
2370 | str = skip_spaces(str); | |
2371 | ||
2372 | /* now copy until next white space */ | |
2373 | while (*str && !isspace(*str) && field_width--) | |
2374 | *s++ = *str++; | |
2375 | *s = '\0'; | |
2376 | num++; | |
2377 | } | |
2378 | continue; | |
2379 | case 'o': | |
2380 | base = 8; | |
2381 | break; | |
2382 | case 'x': | |
2383 | case 'X': | |
2384 | base = 16; | |
2385 | break; | |
2386 | case 'i': | |
2387 | base = 0; | |
2388 | case 'd': | |
2389 | is_sign = 1; | |
2390 | case 'u': | |
2391 | break; | |
2392 | case '%': | |
2393 | /* looking for '%' in str */ | |
2394 | if (*str++ != '%') | |
2395 | return num; | |
2396 | continue; | |
2397 | default: | |
2398 | /* invalid format; stop here */ | |
2399 | return num; | |
2400 | } | |
2401 | ||
2402 | /* have some sort of integer conversion. | |
2403 | * first, skip white space in buffer. | |
2404 | */ | |
2405 | str = skip_spaces(str); | |
2406 | ||
2407 | digit = *str; | |
2408 | if (is_sign && digit == '-') | |
2409 | digit = *(str + 1); | |
2410 | ||
2411 | if (!digit | |
2412 | || (base == 16 && !isxdigit(digit)) | |
2413 | || (base == 10 && !isdigit(digit)) | |
2414 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
2415 | || (base == 0 && !isdigit(digit))) | |
2416 | break; | |
2417 | ||
2418 | if (is_sign) | |
2419 | val.s = qualifier != 'L' ? | |
2420 | simple_strtol(str, &next, base) : | |
2421 | simple_strtoll(str, &next, base); | |
2422 | else | |
2423 | val.u = qualifier != 'L' ? | |
2424 | simple_strtoul(str, &next, base) : | |
2425 | simple_strtoull(str, &next, base); | |
2426 | ||
2427 | if (field_width > 0 && next - str > field_width) { | |
2428 | if (base == 0) | |
2429 | _parse_integer_fixup_radix(str, &base); | |
2430 | while (next - str > field_width) { | |
2431 | if (is_sign) | |
2432 | val.s = div_s64(val.s, base); | |
2433 | else | |
2434 | val.u = div_u64(val.u, base); | |
2435 | --next; | |
2436 | } | |
2437 | } | |
2438 | ||
2439 | switch (qualifier) { | |
2440 | case 'H': /* that's 'hh' in format */ | |
2441 | if (is_sign) | |
2442 | *va_arg(args, signed char *) = val.s; | |
2443 | else | |
2444 | *va_arg(args, unsigned char *) = val.u; | |
2445 | break; | |
2446 | case 'h': | |
2447 | if (is_sign) | |
2448 | *va_arg(args, short *) = val.s; | |
2449 | else | |
2450 | *va_arg(args, unsigned short *) = val.u; | |
2451 | break; | |
2452 | case 'l': | |
2453 | if (is_sign) | |
2454 | *va_arg(args, long *) = val.s; | |
2455 | else | |
2456 | *va_arg(args, unsigned long *) = val.u; | |
2457 | break; | |
2458 | case 'L': | |
2459 | if (is_sign) | |
2460 | *va_arg(args, long long *) = val.s; | |
2461 | else | |
2462 | *va_arg(args, unsigned long long *) = val.u; | |
2463 | break; | |
2464 | case 'Z': | |
2465 | case 'z': | |
2466 | *va_arg(args, size_t *) = val.u; | |
2467 | break; | |
2468 | default: | |
2469 | if (is_sign) | |
2470 | *va_arg(args, int *) = val.s; | |
2471 | else | |
2472 | *va_arg(args, unsigned int *) = val.u; | |
2473 | break; | |
2474 | } | |
2475 | num++; | |
2476 | ||
2477 | if (!next) | |
2478 | break; | |
2479 | str = next; | |
2480 | } | |
2481 | ||
2482 | return num; | |
2483 | } | |
2484 | EXPORT_SYMBOL(vsscanf); | |
2485 | ||
2486 | /** | |
2487 | * sscanf - Unformat a buffer into a list of arguments | |
2488 | * @buf: input buffer | |
2489 | * @fmt: formatting of buffer | |
2490 | * @...: resulting arguments | |
2491 | */ | |
2492 | int sscanf(const char *buf, const char *fmt, ...) | |
2493 | { | |
2494 | va_list args; | |
2495 | int i; | |
2496 | ||
2497 | va_start(args, fmt); | |
2498 | i = vsscanf(buf, fmt, args); | |
2499 | va_end(args); | |
2500 | ||
2501 | return i; | |
2502 | } | |
2503 | EXPORT_SYMBOL(sscanf); |