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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 <linux/string_helpers.h> | |
37 | #include "kstrtox.h" | |
38 | ||
39 | /** | |
40 | * simple_strtoull - convert a string to an unsigned long long | |
41 | * @cp: The start of the string | |
42 | * @endp: A pointer to the end of the parsed string will be placed here | |
43 | * @base: The number base to use | |
44 | * | |
45 | * This function is obsolete. Please use kstrtoull instead. | |
46 | */ | |
47 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) | |
48 | { | |
49 | unsigned long long result; | |
50 | unsigned int rv; | |
51 | ||
52 | cp = _parse_integer_fixup_radix(cp, &base); | |
53 | rv = _parse_integer(cp, base, &result); | |
54 | /* FIXME */ | |
55 | cp += (rv & ~KSTRTOX_OVERFLOW); | |
56 | ||
57 | if (endp) | |
58 | *endp = (char *)cp; | |
59 | ||
60 | return result; | |
61 | } | |
62 | EXPORT_SYMBOL(simple_strtoull); | |
63 | ||
64 | /** | |
65 | * simple_strtoul - convert a string to an unsigned long | |
66 | * @cp: The start of the string | |
67 | * @endp: A pointer to the end of the parsed string will be placed here | |
68 | * @base: The number base to use | |
69 | * | |
70 | * This function is obsolete. Please use kstrtoul instead. | |
71 | */ | |
72 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) | |
73 | { | |
74 | return simple_strtoull(cp, endp, base); | |
75 | } | |
76 | EXPORT_SYMBOL(simple_strtoul); | |
77 | ||
78 | /** | |
79 | * simple_strtol - convert a string to a signed long | |
80 | * @cp: The start of the string | |
81 | * @endp: A pointer to the end of the parsed string will be placed here | |
82 | * @base: The number base to use | |
83 | * | |
84 | * This function is obsolete. Please use kstrtol instead. | |
85 | */ | |
86 | long simple_strtol(const char *cp, char **endp, unsigned int base) | |
87 | { | |
88 | if (*cp == '-') | |
89 | return -simple_strtoul(cp + 1, endp, base); | |
90 | ||
91 | return simple_strtoul(cp, endp, base); | |
92 | } | |
93 | EXPORT_SYMBOL(simple_strtol); | |
94 | ||
95 | /** | |
96 | * simple_strtoll - convert a string to a signed long long | |
97 | * @cp: The start of the string | |
98 | * @endp: A pointer to the end of the parsed string will be placed here | |
99 | * @base: The number base to use | |
100 | * | |
101 | * This function is obsolete. Please use kstrtoll instead. | |
102 | */ | |
103 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) | |
104 | { | |
105 | if (*cp == '-') | |
106 | return -simple_strtoull(cp + 1, endp, base); | |
107 | ||
108 | return simple_strtoull(cp, endp, base); | |
109 | } | |
110 | EXPORT_SYMBOL(simple_strtoll); | |
111 | ||
112 | static noinline_for_stack | |
113 | int skip_atoi(const char **s) | |
114 | { | |
115 | int i = 0; | |
116 | ||
117 | while (isdigit(**s)) | |
118 | i = i*10 + *((*s)++) - '0'; | |
119 | ||
120 | return i; | |
121 | } | |
122 | ||
123 | /* Decimal conversion is by far the most typical, and is used | |
124 | * for /proc and /sys data. This directly impacts e.g. top performance | |
125 | * with many processes running. We optimize it for speed | |
126 | * using ideas described at <http://www.cs.uiowa.edu/~jones/bcd/divide.html> | |
127 | * (with permission from the author, Douglas W. Jones). | |
128 | */ | |
129 | ||
130 | #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64 | |
131 | /* Formats correctly any integer in [0, 999999999] */ | |
132 | static noinline_for_stack | |
133 | char *put_dec_full9(char *buf, unsigned q) | |
134 | { | |
135 | unsigned r; | |
136 | ||
137 | /* | |
138 | * Possible ways to approx. divide by 10 | |
139 | * (x * 0x1999999a) >> 32 x < 1073741829 (multiply must be 64-bit) | |
140 | * (x * 0xcccd) >> 19 x < 81920 (x < 262149 when 64-bit mul) | |
141 | * (x * 0x6667) >> 18 x < 43699 | |
142 | * (x * 0x3334) >> 17 x < 16389 | |
143 | * (x * 0x199a) >> 16 x < 16389 | |
144 | * (x * 0x0ccd) >> 15 x < 16389 | |
145 | * (x * 0x0667) >> 14 x < 2739 | |
146 | * (x * 0x0334) >> 13 x < 1029 | |
147 | * (x * 0x019a) >> 12 x < 1029 | |
148 | * (x * 0x00cd) >> 11 x < 1029 shorter code than * 0x67 (on i386) | |
149 | * (x * 0x0067) >> 10 x < 179 | |
150 | * (x * 0x0034) >> 9 x < 69 same | |
151 | * (x * 0x001a) >> 8 x < 69 same | |
152 | * (x * 0x000d) >> 7 x < 69 same, shortest code (on i386) | |
153 | * (x * 0x0007) >> 6 x < 19 | |
154 | * See <http://www.cs.uiowa.edu/~jones/bcd/divide.html> | |
155 | */ | |
156 | r = (q * (uint64_t)0x1999999a) >> 32; | |
157 | *buf++ = (q - 10 * r) + '0'; /* 1 */ | |
158 | q = (r * (uint64_t)0x1999999a) >> 32; | |
159 | *buf++ = (r - 10 * q) + '0'; /* 2 */ | |
160 | r = (q * (uint64_t)0x1999999a) >> 32; | |
161 | *buf++ = (q - 10 * r) + '0'; /* 3 */ | |
162 | q = (r * (uint64_t)0x1999999a) >> 32; | |
163 | *buf++ = (r - 10 * q) + '0'; /* 4 */ | |
164 | r = (q * (uint64_t)0x1999999a) >> 32; | |
165 | *buf++ = (q - 10 * r) + '0'; /* 5 */ | |
166 | /* Now value is under 10000, can avoid 64-bit multiply */ | |
167 | q = (r * 0x199a) >> 16; | |
168 | *buf++ = (r - 10 * q) + '0'; /* 6 */ | |
169 | r = (q * 0xcd) >> 11; | |
170 | *buf++ = (q - 10 * r) + '0'; /* 7 */ | |
171 | q = (r * 0xcd) >> 11; | |
172 | *buf++ = (r - 10 * q) + '0'; /* 8 */ | |
173 | *buf++ = q + '0'; /* 9 */ | |
174 | return buf; | |
175 | } | |
176 | #endif | |
177 | ||
178 | /* Similar to above but do not pad with zeros. | |
179 | * Code can be easily arranged to print 9 digits too, but our callers | |
180 | * always call put_dec_full9() instead when the number has 9 decimal digits. | |
181 | */ | |
182 | static noinline_for_stack | |
183 | char *put_dec_trunc8(char *buf, unsigned r) | |
184 | { | |
185 | unsigned q; | |
186 | ||
187 | /* Copy of previous function's body with added early returns */ | |
188 | while (r >= 10000) { | |
189 | q = r + '0'; | |
190 | r = (r * (uint64_t)0x1999999a) >> 32; | |
191 | *buf++ = q - 10*r; | |
192 | } | |
193 | ||
194 | q = (r * 0x199a) >> 16; /* r <= 9999 */ | |
195 | *buf++ = (r - 10 * q) + '0'; | |
196 | if (q == 0) | |
197 | return buf; | |
198 | r = (q * 0xcd) >> 11; /* q <= 999 */ | |
199 | *buf++ = (q - 10 * r) + '0'; | |
200 | if (r == 0) | |
201 | return buf; | |
202 | q = (r * 0xcd) >> 11; /* r <= 99 */ | |
203 | *buf++ = (r - 10 * q) + '0'; | |
204 | if (q == 0) | |
205 | return buf; | |
206 | *buf++ = q + '0'; /* q <= 9 */ | |
207 | return buf; | |
208 | } | |
209 | ||
210 | /* There are two algorithms to print larger numbers. | |
211 | * One is generic: divide by 1000000000 and repeatedly print | |
212 | * groups of (up to) 9 digits. It's conceptually simple, | |
213 | * but requires a (unsigned long long) / 1000000000 division. | |
214 | * | |
215 | * Second algorithm splits 64-bit unsigned long long into 16-bit chunks, | |
216 | * manipulates them cleverly and generates groups of 4 decimal digits. | |
217 | * It so happens that it does NOT require long long division. | |
218 | * | |
219 | * If long is > 32 bits, division of 64-bit values is relatively easy, | |
220 | * and we will use the first algorithm. | |
221 | * If long long is > 64 bits (strange architecture with VERY large long long), | |
222 | * second algorithm can't be used, and we again use the first one. | |
223 | * | |
224 | * Else (if long is 32 bits and long long is 64 bits) we use second one. | |
225 | */ | |
226 | ||
227 | #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64 | |
228 | ||
229 | /* First algorithm: generic */ | |
230 | ||
231 | static | |
232 | char *put_dec(char *buf, unsigned long long n) | |
233 | { | |
234 | if (n >= 100*1000*1000) { | |
235 | while (n >= 1000*1000*1000) | |
236 | buf = put_dec_full9(buf, do_div(n, 1000*1000*1000)); | |
237 | if (n >= 100*1000*1000) | |
238 | return put_dec_full9(buf, n); | |
239 | } | |
240 | return put_dec_trunc8(buf, n); | |
241 | } | |
242 | ||
243 | #else | |
244 | ||
245 | /* Second algorithm: valid only for 64-bit long longs */ | |
246 | ||
247 | /* See comment in put_dec_full9 for choice of constants */ | |
248 | static noinline_for_stack | |
249 | void put_dec_full4(char *buf, unsigned q) | |
250 | { | |
251 | unsigned r; | |
252 | r = (q * 0xccd) >> 15; | |
253 | buf[0] = (q - 10 * r) + '0'; | |
254 | q = (r * 0xcd) >> 11; | |
255 | buf[1] = (r - 10 * q) + '0'; | |
256 | r = (q * 0xcd) >> 11; | |
257 | buf[2] = (q - 10 * r) + '0'; | |
258 | buf[3] = r + '0'; | |
259 | } | |
260 | ||
261 | /* | |
262 | * Call put_dec_full4 on x % 10000, return x / 10000. | |
263 | * The approximation x/10000 == (x * 0x346DC5D7) >> 43 | |
264 | * holds for all x < 1,128,869,999. The largest value this | |
265 | * helper will ever be asked to convert is 1,125,520,955. | |
266 | * (d1 in the put_dec code, assuming n is all-ones). | |
267 | */ | |
268 | static | |
269 | unsigned put_dec_helper4(char *buf, unsigned x) | |
270 | { | |
271 | uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43; | |
272 | ||
273 | put_dec_full4(buf, x - q * 10000); | |
274 | return q; | |
275 | } | |
276 | ||
277 | /* Based on code by Douglas W. Jones found at | |
278 | * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour> | |
279 | * (with permission from the author). | |
280 | * Performs no 64-bit division and hence should be fast on 32-bit machines. | |
281 | */ | |
282 | static | |
283 | char *put_dec(char *buf, unsigned long long n) | |
284 | { | |
285 | uint32_t d3, d2, d1, q, h; | |
286 | ||
287 | if (n < 100*1000*1000) | |
288 | return put_dec_trunc8(buf, n); | |
289 | ||
290 | d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */ | |
291 | h = (n >> 32); | |
292 | d2 = (h ) & 0xffff; | |
293 | d3 = (h >> 16); /* implicit "& 0xffff" */ | |
294 | ||
295 | q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff); | |
296 | q = put_dec_helper4(buf, q); | |
297 | ||
298 | q += 7671 * d3 + 9496 * d2 + 6 * d1; | |
299 | q = put_dec_helper4(buf+4, q); | |
300 | ||
301 | q += 4749 * d3 + 42 * d2; | |
302 | q = put_dec_helper4(buf+8, q); | |
303 | ||
304 | q += 281 * d3; | |
305 | buf += 12; | |
306 | if (q) | |
307 | buf = put_dec_trunc8(buf, q); | |
308 | else while (buf[-1] == '0') | |
309 | --buf; | |
310 | ||
311 | return buf; | |
312 | } | |
313 | ||
314 | #endif | |
315 | ||
316 | /* | |
317 | * Convert passed number to decimal string. | |
318 | * Returns the length of string. On buffer overflow, returns 0. | |
319 | * | |
320 | * If speed is not important, use snprintf(). It's easy to read the code. | |
321 | */ | |
322 | int num_to_str(char *buf, int size, unsigned long long num) | |
323 | { | |
324 | char tmp[sizeof(num) * 3]; | |
325 | int idx, len; | |
326 | ||
327 | /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */ | |
328 | if (num <= 9) { | |
329 | tmp[0] = '0' + num; | |
330 | len = 1; | |
331 | } else { | |
332 | len = put_dec(tmp, num) - tmp; | |
333 | } | |
334 | ||
335 | if (len > size) | |
336 | return 0; | |
337 | for (idx = 0; idx < len; ++idx) | |
338 | buf[idx] = tmp[len - idx - 1]; | |
339 | return len; | |
340 | } | |
341 | ||
342 | #define ZEROPAD 1 /* pad with zero */ | |
343 | #define SIGN 2 /* unsigned/signed long */ | |
344 | #define PLUS 4 /* show plus */ | |
345 | #define SPACE 8 /* space if plus */ | |
346 | #define LEFT 16 /* left justified */ | |
347 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ | |
348 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ | |
349 | ||
350 | enum format_type { | |
351 | FORMAT_TYPE_NONE, /* Just a string part */ | |
352 | FORMAT_TYPE_WIDTH, | |
353 | FORMAT_TYPE_PRECISION, | |
354 | FORMAT_TYPE_CHAR, | |
355 | FORMAT_TYPE_STR, | |
356 | FORMAT_TYPE_PTR, | |
357 | FORMAT_TYPE_PERCENT_CHAR, | |
358 | FORMAT_TYPE_INVALID, | |
359 | FORMAT_TYPE_LONG_LONG, | |
360 | FORMAT_TYPE_ULONG, | |
361 | FORMAT_TYPE_LONG, | |
362 | FORMAT_TYPE_UBYTE, | |
363 | FORMAT_TYPE_BYTE, | |
364 | FORMAT_TYPE_USHORT, | |
365 | FORMAT_TYPE_SHORT, | |
366 | FORMAT_TYPE_UINT, | |
367 | FORMAT_TYPE_INT, | |
368 | FORMAT_TYPE_SIZE_T, | |
369 | FORMAT_TYPE_PTRDIFF | |
370 | }; | |
371 | ||
372 | struct printf_spec { | |
373 | u8 type; /* format_type enum */ | |
374 | u8 flags; /* flags to number() */ | |
375 | u8 base; /* number base, 8, 10 or 16 only */ | |
376 | u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */ | |
377 | s16 field_width; /* width of output field */ | |
378 | s16 precision; /* # of digits/chars */ | |
379 | }; | |
380 | ||
381 | static noinline_for_stack | |
382 | char *number(char *buf, char *end, unsigned long long num, | |
383 | struct printf_spec spec) | |
384 | { | |
385 | /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ | |
386 | static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ | |
387 | ||
388 | char tmp[66]; | |
389 | char sign; | |
390 | char locase; | |
391 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); | |
392 | int i; | |
393 | bool is_zero = num == 0LL; | |
394 | ||
395 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' | |
396 | * produces same digits or (maybe lowercased) letters */ | |
397 | locase = (spec.flags & SMALL); | |
398 | if (spec.flags & LEFT) | |
399 | spec.flags &= ~ZEROPAD; | |
400 | sign = 0; | |
401 | if (spec.flags & SIGN) { | |
402 | if ((signed long long)num < 0) { | |
403 | sign = '-'; | |
404 | num = -(signed long long)num; | |
405 | spec.field_width--; | |
406 | } else if (spec.flags & PLUS) { | |
407 | sign = '+'; | |
408 | spec.field_width--; | |
409 | } else if (spec.flags & SPACE) { | |
410 | sign = ' '; | |
411 | spec.field_width--; | |
412 | } | |
413 | } | |
414 | if (need_pfx) { | |
415 | if (spec.base == 16) | |
416 | spec.field_width -= 2; | |
417 | else if (!is_zero) | |
418 | spec.field_width--; | |
419 | } | |
420 | ||
421 | /* generate full string in tmp[], in reverse order */ | |
422 | i = 0; | |
423 | if (num < spec.base) | |
424 | tmp[i++] = digits[num] | locase; | |
425 | /* Generic code, for any base: | |
426 | else do { | |
427 | tmp[i++] = (digits[do_div(num,base)] | locase); | |
428 | } while (num != 0); | |
429 | */ | |
430 | else if (spec.base != 10) { /* 8 or 16 */ | |
431 | int mask = spec.base - 1; | |
432 | int shift = 3; | |
433 | ||
434 | if (spec.base == 16) | |
435 | shift = 4; | |
436 | do { | |
437 | tmp[i++] = (digits[((unsigned char)num) & mask] | locase); | |
438 | num >>= shift; | |
439 | } while (num); | |
440 | } else { /* base 10 */ | |
441 | i = put_dec(tmp, num) - tmp; | |
442 | } | |
443 | ||
444 | /* printing 100 using %2d gives "100", not "00" */ | |
445 | if (i > spec.precision) | |
446 | spec.precision = i; | |
447 | /* leading space padding */ | |
448 | spec.field_width -= spec.precision; | |
449 | if (!(spec.flags & (ZEROPAD+LEFT))) { | |
450 | while (--spec.field_width >= 0) { | |
451 | if (buf < end) | |
452 | *buf = ' '; | |
453 | ++buf; | |
454 | } | |
455 | } | |
456 | /* sign */ | |
457 | if (sign) { | |
458 | if (buf < end) | |
459 | *buf = sign; | |
460 | ++buf; | |
461 | } | |
462 | /* "0x" / "0" prefix */ | |
463 | if (need_pfx) { | |
464 | if (spec.base == 16 || !is_zero) { | |
465 | if (buf < end) | |
466 | *buf = '0'; | |
467 | ++buf; | |
468 | } | |
469 | if (spec.base == 16) { | |
470 | if (buf < end) | |
471 | *buf = ('X' | locase); | |
472 | ++buf; | |
473 | } | |
474 | } | |
475 | /* zero or space padding */ | |
476 | if (!(spec.flags & LEFT)) { | |
477 | char c = (spec.flags & ZEROPAD) ? '0' : ' '; | |
478 | while (--spec.field_width >= 0) { | |
479 | if (buf < end) | |
480 | *buf = c; | |
481 | ++buf; | |
482 | } | |
483 | } | |
484 | /* hmm even more zero padding? */ | |
485 | while (i <= --spec.precision) { | |
486 | if (buf < end) | |
487 | *buf = '0'; | |
488 | ++buf; | |
489 | } | |
490 | /* actual digits of result */ | |
491 | while (--i >= 0) { | |
492 | if (buf < end) | |
493 | *buf = tmp[i]; | |
494 | ++buf; | |
495 | } | |
496 | /* trailing space padding */ | |
497 | while (--spec.field_width >= 0) { | |
498 | if (buf < end) | |
499 | *buf = ' '; | |
500 | ++buf; | |
501 | } | |
502 | ||
503 | return buf; | |
504 | } | |
505 | ||
506 | static noinline_for_stack | |
507 | char *string(char *buf, char *end, const char *s, struct printf_spec spec) | |
508 | { | |
509 | int len, i; | |
510 | ||
511 | if ((unsigned long)s < PAGE_SIZE) | |
512 | s = "(null)"; | |
513 | ||
514 | len = strnlen(s, spec.precision); | |
515 | ||
516 | if (!(spec.flags & LEFT)) { | |
517 | while (len < spec.field_width--) { | |
518 | if (buf < end) | |
519 | *buf = ' '; | |
520 | ++buf; | |
521 | } | |
522 | } | |
523 | for (i = 0; i < len; ++i) { | |
524 | if (buf < end) | |
525 | *buf = *s; | |
526 | ++buf; ++s; | |
527 | } | |
528 | while (len < spec.field_width--) { | |
529 | if (buf < end) | |
530 | *buf = ' '; | |
531 | ++buf; | |
532 | } | |
533 | ||
534 | return buf; | |
535 | } | |
536 | ||
537 | static void widen(char *buf, char *end, unsigned len, unsigned spaces) | |
538 | { | |
539 | size_t size; | |
540 | if (buf >= end) /* nowhere to put anything */ | |
541 | return; | |
542 | size = end - buf; | |
543 | if (size <= spaces) { | |
544 | memset(buf, ' ', size); | |
545 | return; | |
546 | } | |
547 | if (len) { | |
548 | if (len > size - spaces) | |
549 | len = size - spaces; | |
550 | memmove(buf + spaces, buf, len); | |
551 | } | |
552 | memset(buf, ' ', spaces); | |
553 | } | |
554 | ||
555 | static noinline_for_stack | |
556 | char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec, | |
557 | const char *fmt) | |
558 | { | |
559 | const char *array[4], *s; | |
560 | const struct dentry *p; | |
561 | int depth; | |
562 | int i, n; | |
563 | ||
564 | switch (fmt[1]) { | |
565 | case '2': case '3': case '4': | |
566 | depth = fmt[1] - '0'; | |
567 | break; | |
568 | default: | |
569 | depth = 1; | |
570 | } | |
571 | ||
572 | rcu_read_lock(); | |
573 | for (i = 0; i < depth; i++, d = p) { | |
574 | p = ACCESS_ONCE(d->d_parent); | |
575 | array[i] = ACCESS_ONCE(d->d_name.name); | |
576 | if (p == d) { | |
577 | if (i) | |
578 | array[i] = ""; | |
579 | i++; | |
580 | break; | |
581 | } | |
582 | } | |
583 | s = array[--i]; | |
584 | for (n = 0; n != spec.precision; n++, buf++) { | |
585 | char c = *s++; | |
586 | if (!c) { | |
587 | if (!i) | |
588 | break; | |
589 | c = '/'; | |
590 | s = array[--i]; | |
591 | } | |
592 | if (buf < end) | |
593 | *buf = c; | |
594 | } | |
595 | rcu_read_unlock(); | |
596 | if (n < spec.field_width) { | |
597 | /* we want to pad the sucker */ | |
598 | unsigned spaces = spec.field_width - n; | |
599 | if (!(spec.flags & LEFT)) { | |
600 | widen(buf - n, end, n, spaces); | |
601 | return buf + spaces; | |
602 | } | |
603 | while (spaces--) { | |
604 | if (buf < end) | |
605 | *buf = ' '; | |
606 | ++buf; | |
607 | } | |
608 | } | |
609 | return buf; | |
610 | } | |
611 | ||
612 | static noinline_for_stack | |
613 | char *symbol_string(char *buf, char *end, void *ptr, | |
614 | struct printf_spec spec, const char *fmt) | |
615 | { | |
616 | unsigned long value; | |
617 | #ifdef CONFIG_KALLSYMS | |
618 | char sym[KSYM_SYMBOL_LEN]; | |
619 | #endif | |
620 | ||
621 | if (fmt[1] == 'R') | |
622 | ptr = __builtin_extract_return_addr(ptr); | |
623 | value = (unsigned long)ptr; | |
624 | ||
625 | #ifdef CONFIG_KALLSYMS | |
626 | if (*fmt == 'B') | |
627 | sprint_backtrace(sym, value); | |
628 | else if (*fmt != 'f' && *fmt != 's') | |
629 | sprint_symbol(sym, value); | |
630 | else | |
631 | sprint_symbol_no_offset(sym, value); | |
632 | ||
633 | return string(buf, end, sym, spec); | |
634 | #else | |
635 | spec.field_width = 2 * sizeof(void *); | |
636 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
637 | spec.base = 16; | |
638 | ||
639 | return number(buf, end, value, spec); | |
640 | #endif | |
641 | } | |
642 | ||
643 | static noinline_for_stack | |
644 | char *resource_string(char *buf, char *end, struct resource *res, | |
645 | struct printf_spec spec, const char *fmt) | |
646 | { | |
647 | #ifndef IO_RSRC_PRINTK_SIZE | |
648 | #define IO_RSRC_PRINTK_SIZE 6 | |
649 | #endif | |
650 | ||
651 | #ifndef MEM_RSRC_PRINTK_SIZE | |
652 | #define MEM_RSRC_PRINTK_SIZE 10 | |
653 | #endif | |
654 | static const struct printf_spec io_spec = { | |
655 | .base = 16, | |
656 | .field_width = IO_RSRC_PRINTK_SIZE, | |
657 | .precision = -1, | |
658 | .flags = SPECIAL | SMALL | ZEROPAD, | |
659 | }; | |
660 | static const struct printf_spec mem_spec = { | |
661 | .base = 16, | |
662 | .field_width = MEM_RSRC_PRINTK_SIZE, | |
663 | .precision = -1, | |
664 | .flags = SPECIAL | SMALL | ZEROPAD, | |
665 | }; | |
666 | static const struct printf_spec bus_spec = { | |
667 | .base = 16, | |
668 | .field_width = 2, | |
669 | .precision = -1, | |
670 | .flags = SMALL | ZEROPAD, | |
671 | }; | |
672 | static const struct printf_spec dec_spec = { | |
673 | .base = 10, | |
674 | .precision = -1, | |
675 | .flags = 0, | |
676 | }; | |
677 | static const struct printf_spec str_spec = { | |
678 | .field_width = -1, | |
679 | .precision = 10, | |
680 | .flags = LEFT, | |
681 | }; | |
682 | static const struct printf_spec flag_spec = { | |
683 | .base = 16, | |
684 | .precision = -1, | |
685 | .flags = SPECIAL | SMALL, | |
686 | }; | |
687 | ||
688 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) | |
689 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ | |
690 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) | |
691 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) | |
692 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") | |
693 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") | |
694 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, | |
695 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; | |
696 | ||
697 | char *p = sym, *pend = sym + sizeof(sym); | |
698 | int decode = (fmt[0] == 'R') ? 1 : 0; | |
699 | const struct printf_spec *specp; | |
700 | ||
701 | *p++ = '['; | |
702 | if (res->flags & IORESOURCE_IO) { | |
703 | p = string(p, pend, "io ", str_spec); | |
704 | specp = &io_spec; | |
705 | } else if (res->flags & IORESOURCE_MEM) { | |
706 | p = string(p, pend, "mem ", str_spec); | |
707 | specp = &mem_spec; | |
708 | } else if (res->flags & IORESOURCE_IRQ) { | |
709 | p = string(p, pend, "irq ", str_spec); | |
710 | specp = &dec_spec; | |
711 | } else if (res->flags & IORESOURCE_DMA) { | |
712 | p = string(p, pend, "dma ", str_spec); | |
713 | specp = &dec_spec; | |
714 | } else if (res->flags & IORESOURCE_BUS) { | |
715 | p = string(p, pend, "bus ", str_spec); | |
716 | specp = &bus_spec; | |
717 | } else { | |
718 | p = string(p, pend, "??? ", str_spec); | |
719 | specp = &mem_spec; | |
720 | decode = 0; | |
721 | } | |
722 | if (decode && res->flags & IORESOURCE_UNSET) { | |
723 | p = string(p, pend, "size ", str_spec); | |
724 | p = number(p, pend, resource_size(res), *specp); | |
725 | } else { | |
726 | p = number(p, pend, res->start, *specp); | |
727 | if (res->start != res->end) { | |
728 | *p++ = '-'; | |
729 | p = number(p, pend, res->end, *specp); | |
730 | } | |
731 | } | |
732 | if (decode) { | |
733 | if (res->flags & IORESOURCE_MEM_64) | |
734 | p = string(p, pend, " 64bit", str_spec); | |
735 | if (res->flags & IORESOURCE_PREFETCH) | |
736 | p = string(p, pend, " pref", str_spec); | |
737 | if (res->flags & IORESOURCE_WINDOW) | |
738 | p = string(p, pend, " window", str_spec); | |
739 | if (res->flags & IORESOURCE_DISABLED) | |
740 | p = string(p, pend, " disabled", str_spec); | |
741 | } else { | |
742 | p = string(p, pend, " flags ", str_spec); | |
743 | p = number(p, pend, res->flags, flag_spec); | |
744 | } | |
745 | *p++ = ']'; | |
746 | *p = '\0'; | |
747 | ||
748 | return string(buf, end, sym, spec); | |
749 | } | |
750 | ||
751 | static noinline_for_stack | |
752 | char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
753 | const char *fmt) | |
754 | { | |
755 | int i, len = 1; /* if we pass '%ph[CDN]', field width remains | |
756 | negative value, fallback to the default */ | |
757 | char separator; | |
758 | ||
759 | if (spec.field_width == 0) | |
760 | /* nothing to print */ | |
761 | return buf; | |
762 | ||
763 | if (ZERO_OR_NULL_PTR(addr)) | |
764 | /* NULL pointer */ | |
765 | return string(buf, end, NULL, spec); | |
766 | ||
767 | switch (fmt[1]) { | |
768 | case 'C': | |
769 | separator = ':'; | |
770 | break; | |
771 | case 'D': | |
772 | separator = '-'; | |
773 | break; | |
774 | case 'N': | |
775 | separator = 0; | |
776 | break; | |
777 | default: | |
778 | separator = ' '; | |
779 | break; | |
780 | } | |
781 | ||
782 | if (spec.field_width > 0) | |
783 | len = min_t(int, spec.field_width, 64); | |
784 | ||
785 | for (i = 0; i < len && buf < end - 1; i++) { | |
786 | buf = hex_byte_pack(buf, addr[i]); | |
787 | ||
788 | if (buf < end && separator && i != len - 1) | |
789 | *buf++ = separator; | |
790 | } | |
791 | ||
792 | return buf; | |
793 | } | |
794 | ||
795 | static noinline_for_stack | |
796 | char *mac_address_string(char *buf, char *end, u8 *addr, | |
797 | struct printf_spec spec, const char *fmt) | |
798 | { | |
799 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; | |
800 | char *p = mac_addr; | |
801 | int i; | |
802 | char separator; | |
803 | bool reversed = false; | |
804 | ||
805 | switch (fmt[1]) { | |
806 | case 'F': | |
807 | separator = '-'; | |
808 | break; | |
809 | ||
810 | case 'R': | |
811 | reversed = true; | |
812 | /* fall through */ | |
813 | ||
814 | default: | |
815 | separator = ':'; | |
816 | break; | |
817 | } | |
818 | ||
819 | for (i = 0; i < 6; i++) { | |
820 | if (reversed) | |
821 | p = hex_byte_pack(p, addr[5 - i]); | |
822 | else | |
823 | p = hex_byte_pack(p, addr[i]); | |
824 | ||
825 | if (fmt[0] == 'M' && i != 5) | |
826 | *p++ = separator; | |
827 | } | |
828 | *p = '\0'; | |
829 | ||
830 | return string(buf, end, mac_addr, spec); | |
831 | } | |
832 | ||
833 | static noinline_for_stack | |
834 | char *ip4_string(char *p, const u8 *addr, const char *fmt) | |
835 | { | |
836 | int i; | |
837 | bool leading_zeros = (fmt[0] == 'i'); | |
838 | int index; | |
839 | int step; | |
840 | ||
841 | switch (fmt[2]) { | |
842 | case 'h': | |
843 | #ifdef __BIG_ENDIAN | |
844 | index = 0; | |
845 | step = 1; | |
846 | #else | |
847 | index = 3; | |
848 | step = -1; | |
849 | #endif | |
850 | break; | |
851 | case 'l': | |
852 | index = 3; | |
853 | step = -1; | |
854 | break; | |
855 | case 'n': | |
856 | case 'b': | |
857 | default: | |
858 | index = 0; | |
859 | step = 1; | |
860 | break; | |
861 | } | |
862 | for (i = 0; i < 4; i++) { | |
863 | char temp[3]; /* hold each IP quad in reverse order */ | |
864 | int digits = put_dec_trunc8(temp, addr[index]) - temp; | |
865 | if (leading_zeros) { | |
866 | if (digits < 3) | |
867 | *p++ = '0'; | |
868 | if (digits < 2) | |
869 | *p++ = '0'; | |
870 | } | |
871 | /* reverse the digits in the quad */ | |
872 | while (digits--) | |
873 | *p++ = temp[digits]; | |
874 | if (i < 3) | |
875 | *p++ = '.'; | |
876 | index += step; | |
877 | } | |
878 | *p = '\0'; | |
879 | ||
880 | return p; | |
881 | } | |
882 | ||
883 | static noinline_for_stack | |
884 | char *ip6_compressed_string(char *p, const char *addr) | |
885 | { | |
886 | int i, j, range; | |
887 | unsigned char zerolength[8]; | |
888 | int longest = 1; | |
889 | int colonpos = -1; | |
890 | u16 word; | |
891 | u8 hi, lo; | |
892 | bool needcolon = false; | |
893 | bool useIPv4; | |
894 | struct in6_addr in6; | |
895 | ||
896 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
897 | ||
898 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
899 | ||
900 | memset(zerolength, 0, sizeof(zerolength)); | |
901 | ||
902 | if (useIPv4) | |
903 | range = 6; | |
904 | else | |
905 | range = 8; | |
906 | ||
907 | /* find position of longest 0 run */ | |
908 | for (i = 0; i < range; i++) { | |
909 | for (j = i; j < range; j++) { | |
910 | if (in6.s6_addr16[j] != 0) | |
911 | break; | |
912 | zerolength[i]++; | |
913 | } | |
914 | } | |
915 | for (i = 0; i < range; i++) { | |
916 | if (zerolength[i] > longest) { | |
917 | longest = zerolength[i]; | |
918 | colonpos = i; | |
919 | } | |
920 | } | |
921 | if (longest == 1) /* don't compress a single 0 */ | |
922 | colonpos = -1; | |
923 | ||
924 | /* emit address */ | |
925 | for (i = 0; i < range; i++) { | |
926 | if (i == colonpos) { | |
927 | if (needcolon || i == 0) | |
928 | *p++ = ':'; | |
929 | *p++ = ':'; | |
930 | needcolon = false; | |
931 | i += longest - 1; | |
932 | continue; | |
933 | } | |
934 | if (needcolon) { | |
935 | *p++ = ':'; | |
936 | needcolon = false; | |
937 | } | |
938 | /* hex u16 without leading 0s */ | |
939 | word = ntohs(in6.s6_addr16[i]); | |
940 | hi = word >> 8; | |
941 | lo = word & 0xff; | |
942 | if (hi) { | |
943 | if (hi > 0x0f) | |
944 | p = hex_byte_pack(p, hi); | |
945 | else | |
946 | *p++ = hex_asc_lo(hi); | |
947 | p = hex_byte_pack(p, lo); | |
948 | } | |
949 | else if (lo > 0x0f) | |
950 | p = hex_byte_pack(p, lo); | |
951 | else | |
952 | *p++ = hex_asc_lo(lo); | |
953 | needcolon = true; | |
954 | } | |
955 | ||
956 | if (useIPv4) { | |
957 | if (needcolon) | |
958 | *p++ = ':'; | |
959 | p = ip4_string(p, &in6.s6_addr[12], "I4"); | |
960 | } | |
961 | *p = '\0'; | |
962 | ||
963 | return p; | |
964 | } | |
965 | ||
966 | static noinline_for_stack | |
967 | char *ip6_string(char *p, const char *addr, const char *fmt) | |
968 | { | |
969 | int i; | |
970 | ||
971 | for (i = 0; i < 8; i++) { | |
972 | p = hex_byte_pack(p, *addr++); | |
973 | p = hex_byte_pack(p, *addr++); | |
974 | if (fmt[0] == 'I' && i != 7) | |
975 | *p++ = ':'; | |
976 | } | |
977 | *p = '\0'; | |
978 | ||
979 | return p; | |
980 | } | |
981 | ||
982 | static noinline_for_stack | |
983 | char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
984 | struct printf_spec spec, const char *fmt) | |
985 | { | |
986 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
987 | ||
988 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
989 | ip6_compressed_string(ip6_addr, addr); | |
990 | else | |
991 | ip6_string(ip6_addr, addr, fmt); | |
992 | ||
993 | return string(buf, end, ip6_addr, spec); | |
994 | } | |
995 | ||
996 | static noinline_for_stack | |
997 | char *ip4_addr_string(char *buf, char *end, const u8 *addr, | |
998 | struct printf_spec spec, const char *fmt) | |
999 | { | |
1000 | char ip4_addr[sizeof("255.255.255.255")]; | |
1001 | ||
1002 | ip4_string(ip4_addr, addr, fmt); | |
1003 | ||
1004 | return string(buf, end, ip4_addr, spec); | |
1005 | } | |
1006 | ||
1007 | static noinline_for_stack | |
1008 | char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa, | |
1009 | struct printf_spec spec, const char *fmt) | |
1010 | { | |
1011 | bool have_p = false, have_s = false, have_f = false, have_c = false; | |
1012 | char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") + | |
1013 | sizeof(":12345") + sizeof("/123456789") + | |
1014 | sizeof("%1234567890")]; | |
1015 | char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr); | |
1016 | const u8 *addr = (const u8 *) &sa->sin6_addr; | |
1017 | char fmt6[2] = { fmt[0], '6' }; | |
1018 | u8 off = 0; | |
1019 | ||
1020 | fmt++; | |
1021 | while (isalpha(*++fmt)) { | |
1022 | switch (*fmt) { | |
1023 | case 'p': | |
1024 | have_p = true; | |
1025 | break; | |
1026 | case 'f': | |
1027 | have_f = true; | |
1028 | break; | |
1029 | case 's': | |
1030 | have_s = true; | |
1031 | break; | |
1032 | case 'c': | |
1033 | have_c = true; | |
1034 | break; | |
1035 | } | |
1036 | } | |
1037 | ||
1038 | if (have_p || have_s || have_f) { | |
1039 | *p = '['; | |
1040 | off = 1; | |
1041 | } | |
1042 | ||
1043 | if (fmt6[0] == 'I' && have_c) | |
1044 | p = ip6_compressed_string(ip6_addr + off, addr); | |
1045 | else | |
1046 | p = ip6_string(ip6_addr + off, addr, fmt6); | |
1047 | ||
1048 | if (have_p || have_s || have_f) | |
1049 | *p++ = ']'; | |
1050 | ||
1051 | if (have_p) { | |
1052 | *p++ = ':'; | |
1053 | p = number(p, pend, ntohs(sa->sin6_port), spec); | |
1054 | } | |
1055 | if (have_f) { | |
1056 | *p++ = '/'; | |
1057 | p = number(p, pend, ntohl(sa->sin6_flowinfo & | |
1058 | IPV6_FLOWINFO_MASK), spec); | |
1059 | } | |
1060 | if (have_s) { | |
1061 | *p++ = '%'; | |
1062 | p = number(p, pend, sa->sin6_scope_id, spec); | |
1063 | } | |
1064 | *p = '\0'; | |
1065 | ||
1066 | return string(buf, end, ip6_addr, spec); | |
1067 | } | |
1068 | ||
1069 | static noinline_for_stack | |
1070 | char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa, | |
1071 | struct printf_spec spec, const char *fmt) | |
1072 | { | |
1073 | bool have_p = false; | |
1074 | char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")]; | |
1075 | char *pend = ip4_addr + sizeof(ip4_addr); | |
1076 | const u8 *addr = (const u8 *) &sa->sin_addr.s_addr; | |
1077 | char fmt4[3] = { fmt[0], '4', 0 }; | |
1078 | ||
1079 | fmt++; | |
1080 | while (isalpha(*++fmt)) { | |
1081 | switch (*fmt) { | |
1082 | case 'p': | |
1083 | have_p = true; | |
1084 | break; | |
1085 | case 'h': | |
1086 | case 'l': | |
1087 | case 'n': | |
1088 | case 'b': | |
1089 | fmt4[2] = *fmt; | |
1090 | break; | |
1091 | } | |
1092 | } | |
1093 | ||
1094 | p = ip4_string(ip4_addr, addr, fmt4); | |
1095 | if (have_p) { | |
1096 | *p++ = ':'; | |
1097 | p = number(p, pend, ntohs(sa->sin_port), spec); | |
1098 | } | |
1099 | *p = '\0'; | |
1100 | ||
1101 | return string(buf, end, ip4_addr, spec); | |
1102 | } | |
1103 | ||
1104 | static noinline_for_stack | |
1105 | char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
1106 | const char *fmt) | |
1107 | { | |
1108 | bool found = true; | |
1109 | int count = 1; | |
1110 | unsigned int flags = 0; | |
1111 | int len; | |
1112 | ||
1113 | if (spec.field_width == 0) | |
1114 | return buf; /* nothing to print */ | |
1115 | ||
1116 | if (ZERO_OR_NULL_PTR(addr)) | |
1117 | return string(buf, end, NULL, spec); /* NULL pointer */ | |
1118 | ||
1119 | ||
1120 | do { | |
1121 | switch (fmt[count++]) { | |
1122 | case 'a': | |
1123 | flags |= ESCAPE_ANY; | |
1124 | break; | |
1125 | case 'c': | |
1126 | flags |= ESCAPE_SPECIAL; | |
1127 | break; | |
1128 | case 'h': | |
1129 | flags |= ESCAPE_HEX; | |
1130 | break; | |
1131 | case 'n': | |
1132 | flags |= ESCAPE_NULL; | |
1133 | break; | |
1134 | case 'o': | |
1135 | flags |= ESCAPE_OCTAL; | |
1136 | break; | |
1137 | case 'p': | |
1138 | flags |= ESCAPE_NP; | |
1139 | break; | |
1140 | case 's': | |
1141 | flags |= ESCAPE_SPACE; | |
1142 | break; | |
1143 | default: | |
1144 | found = false; | |
1145 | break; | |
1146 | } | |
1147 | } while (found); | |
1148 | ||
1149 | if (!flags) | |
1150 | flags = ESCAPE_ANY_NP; | |
1151 | ||
1152 | len = spec.field_width < 0 ? 1 : spec.field_width; | |
1153 | ||
1154 | /* Ignore the error. We print as many characters as we can */ | |
1155 | string_escape_mem(addr, len, &buf, end - buf, flags, NULL); | |
1156 | ||
1157 | return buf; | |
1158 | } | |
1159 | ||
1160 | static noinline_for_stack | |
1161 | char *uuid_string(char *buf, char *end, const u8 *addr, | |
1162 | struct printf_spec spec, const char *fmt) | |
1163 | { | |
1164 | char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; | |
1165 | char *p = uuid; | |
1166 | int i; | |
1167 | static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; | |
1168 | static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; | |
1169 | const u8 *index = be; | |
1170 | bool uc = false; | |
1171 | ||
1172 | switch (*(++fmt)) { | |
1173 | case 'L': | |
1174 | uc = true; /* fall-through */ | |
1175 | case 'l': | |
1176 | index = le; | |
1177 | break; | |
1178 | case 'B': | |
1179 | uc = true; | |
1180 | break; | |
1181 | } | |
1182 | ||
1183 | for (i = 0; i < 16; i++) { | |
1184 | p = hex_byte_pack(p, addr[index[i]]); | |
1185 | switch (i) { | |
1186 | case 3: | |
1187 | case 5: | |
1188 | case 7: | |
1189 | case 9: | |
1190 | *p++ = '-'; | |
1191 | break; | |
1192 | } | |
1193 | } | |
1194 | ||
1195 | *p = 0; | |
1196 | ||
1197 | if (uc) { | |
1198 | p = uuid; | |
1199 | do { | |
1200 | *p = toupper(*p); | |
1201 | } while (*(++p)); | |
1202 | } | |
1203 | ||
1204 | return string(buf, end, uuid, spec); | |
1205 | } | |
1206 | ||
1207 | static | |
1208 | char *netdev_feature_string(char *buf, char *end, const u8 *addr, | |
1209 | struct printf_spec spec) | |
1210 | { | |
1211 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
1212 | if (spec.field_width == -1) | |
1213 | spec.field_width = 2 + 2 * sizeof(netdev_features_t); | |
1214 | spec.base = 16; | |
1215 | ||
1216 | return number(buf, end, *(const netdev_features_t *)addr, spec); | |
1217 | } | |
1218 | ||
1219 | static noinline_for_stack | |
1220 | char *address_val(char *buf, char *end, const void *addr, | |
1221 | struct printf_spec spec, const char *fmt) | |
1222 | { | |
1223 | unsigned long long num; | |
1224 | ||
1225 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
1226 | spec.base = 16; | |
1227 | ||
1228 | switch (fmt[1]) { | |
1229 | case 'd': | |
1230 | num = *(const dma_addr_t *)addr; | |
1231 | spec.field_width = sizeof(dma_addr_t) * 2 + 2; | |
1232 | break; | |
1233 | case 'p': | |
1234 | default: | |
1235 | num = *(const phys_addr_t *)addr; | |
1236 | spec.field_width = sizeof(phys_addr_t) * 2 + 2; | |
1237 | break; | |
1238 | } | |
1239 | ||
1240 | return number(buf, end, num, spec); | |
1241 | } | |
1242 | ||
1243 | int kptr_restrict __read_mostly; | |
1244 | ||
1245 | /* | |
1246 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
1247 | * by an extra set of alphanumeric characters that are extended format | |
1248 | * specifiers. | |
1249 | * | |
1250 | * Right now we handle: | |
1251 | * | |
1252 | * - 'F' For symbolic function descriptor pointers with offset | |
1253 | * - 'f' For simple symbolic function names without offset | |
1254 | * - 'S' For symbolic direct pointers with offset | |
1255 | * - 's' For symbolic direct pointers without offset | |
1256 | * - '[FfSs]R' as above with __builtin_extract_return_addr() translation | |
1257 | * - 'B' For backtraced symbolic direct pointers with offset | |
1258 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] | |
1259 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] | |
1260 | * - 'M' For a 6-byte MAC address, it prints the address in the | |
1261 | * usual colon-separated hex notation | |
1262 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons | |
1263 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address | |
1264 | * with a dash-separated hex notation | |
1265 | * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth) | |
1266 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way | |
1267 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
1268 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
1269 | * [S][pfs] | |
1270 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1271 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
1272 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses | |
1273 | * IPv6 omits the colons (01020304...0f) | |
1274 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
1275 | * [S][pfs] | |
1276 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1277 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
1278 | * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order | |
1279 | * - 'I[6S]c' for IPv6 addresses printed as specified by | |
1280 | * http://tools.ietf.org/html/rfc5952 | |
1281 | * - 'E[achnops]' For an escaped buffer, where rules are defined by combination | |
1282 | * of the following flags (see string_escape_mem() for the | |
1283 | * details): | |
1284 | * a - ESCAPE_ANY | |
1285 | * c - ESCAPE_SPECIAL | |
1286 | * h - ESCAPE_HEX | |
1287 | * n - ESCAPE_NULL | |
1288 | * o - ESCAPE_OCTAL | |
1289 | * p - ESCAPE_NP | |
1290 | * s - ESCAPE_SPACE | |
1291 | * By default ESCAPE_ANY_NP is used. | |
1292 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form | |
1293 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" | |
1294 | * Options for %pU are: | |
1295 | * b big endian lower case hex (default) | |
1296 | * B big endian UPPER case hex | |
1297 | * l little endian lower case hex | |
1298 | * L little endian UPPER case hex | |
1299 | * big endian output byte order is: | |
1300 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] | |
1301 | * little endian output byte order is: | |
1302 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] | |
1303 | * - 'V' For a struct va_format which contains a format string * and va_list *, | |
1304 | * call vsnprintf(->format, *->va_list). | |
1305 | * Implements a "recursive vsnprintf". | |
1306 | * Do not use this feature without some mechanism to verify the | |
1307 | * correctness of the format string and va_list arguments. | |
1308 | * - 'K' For a kernel pointer that should be hidden from unprivileged users | |
1309 | * - 'NF' For a netdev_features_t | |
1310 | * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with | |
1311 | * a certain separator (' ' by default): | |
1312 | * C colon | |
1313 | * D dash | |
1314 | * N no separator | |
1315 | * The maximum supported length is 64 bytes of the input. Consider | |
1316 | * to use print_hex_dump() for the larger input. | |
1317 | * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives | |
1318 | * (default assumed to be phys_addr_t, passed by reference) | |
1319 | * - 'd[234]' For a dentry name (optionally 2-4 last components) | |
1320 | * - 'D[234]' Same as 'd' but for a struct file | |
1321 | * | |
1322 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 | |
1323 | * function pointers are really function descriptors, which contain a | |
1324 | * pointer to the real address. | |
1325 | */ | |
1326 | static noinline_for_stack | |
1327 | char *pointer(const char *fmt, char *buf, char *end, void *ptr, | |
1328 | struct printf_spec spec) | |
1329 | { | |
1330 | int default_width = 2 * sizeof(void *) + (spec.flags & SPECIAL ? 2 : 0); | |
1331 | ||
1332 | if (!ptr && *fmt != 'K') { | |
1333 | /* | |
1334 | * Print (null) with the same width as a pointer so it makes | |
1335 | * tabular output look nice. | |
1336 | */ | |
1337 | if (spec.field_width == -1) | |
1338 | spec.field_width = default_width; | |
1339 | return string(buf, end, "(null)", spec); | |
1340 | } | |
1341 | ||
1342 | switch (*fmt) { | |
1343 | case 'F': | |
1344 | case 'f': | |
1345 | ptr = dereference_function_descriptor(ptr); | |
1346 | /* Fallthrough */ | |
1347 | case 'S': | |
1348 | case 's': | |
1349 | case 'B': | |
1350 | return symbol_string(buf, end, ptr, spec, fmt); | |
1351 | case 'R': | |
1352 | case 'r': | |
1353 | return resource_string(buf, end, ptr, spec, fmt); | |
1354 | case 'h': | |
1355 | return hex_string(buf, end, ptr, spec, fmt); | |
1356 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ | |
1357 | case 'm': /* Contiguous: 000102030405 */ | |
1358 | /* [mM]F (FDDI) */ | |
1359 | /* [mM]R (Reverse order; Bluetooth) */ | |
1360 | return mac_address_string(buf, end, ptr, spec, fmt); | |
1361 | case 'I': /* Formatted IP supported | |
1362 | * 4: 1.2.3.4 | |
1363 | * 6: 0001:0203:...:0708 | |
1364 | * 6c: 1::708 or 1::1.2.3.4 | |
1365 | */ | |
1366 | case 'i': /* Contiguous: | |
1367 | * 4: 001.002.003.004 | |
1368 | * 6: 000102...0f | |
1369 | */ | |
1370 | switch (fmt[1]) { | |
1371 | case '6': | |
1372 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
1373 | case '4': | |
1374 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
1375 | case 'S': { | |
1376 | const union { | |
1377 | struct sockaddr raw; | |
1378 | struct sockaddr_in v4; | |
1379 | struct sockaddr_in6 v6; | |
1380 | } *sa = ptr; | |
1381 | ||
1382 | switch (sa->raw.sa_family) { | |
1383 | case AF_INET: | |
1384 | return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt); | |
1385 | case AF_INET6: | |
1386 | return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt); | |
1387 | default: | |
1388 | return string(buf, end, "(invalid address)", spec); | |
1389 | }} | |
1390 | } | |
1391 | break; | |
1392 | case 'E': | |
1393 | return escaped_string(buf, end, ptr, spec, fmt); | |
1394 | case 'U': | |
1395 | return uuid_string(buf, end, ptr, spec, fmt); | |
1396 | case 'V': | |
1397 | { | |
1398 | va_list va; | |
1399 | ||
1400 | va_copy(va, *((struct va_format *)ptr)->va); | |
1401 | buf += vsnprintf(buf, end > buf ? end - buf : 0, | |
1402 | ((struct va_format *)ptr)->fmt, va); | |
1403 | va_end(va); | |
1404 | return buf; | |
1405 | } | |
1406 | case 'K': | |
1407 | /* | |
1408 | * %pK cannot be used in IRQ context because its test | |
1409 | * for CAP_SYSLOG would be meaningless. | |
1410 | */ | |
1411 | if (kptr_restrict && (in_irq() || in_serving_softirq() || | |
1412 | in_nmi())) { | |
1413 | if (spec.field_width == -1) | |
1414 | spec.field_width = default_width; | |
1415 | return string(buf, end, "pK-error", spec); | |
1416 | } | |
1417 | ||
1418 | switch (kptr_restrict) { | |
1419 | case 0: | |
1420 | /* Always print %pK values */ | |
1421 | break; | |
1422 | case 1: { | |
1423 | /* | |
1424 | * Only print the real pointer value if the current | |
1425 | * process has CAP_SYSLOG and is running with the | |
1426 | * same credentials it started with. This is because | |
1427 | * access to files is checked at open() time, but %pK | |
1428 | * checks permission at read() time. We don't want to | |
1429 | * leak pointer values if a binary opens a file using | |
1430 | * %pK and then elevates privileges before reading it. | |
1431 | */ | |
1432 | const struct cred *cred = current_cred(); | |
1433 | ||
1434 | if (!has_capability_noaudit(current, CAP_SYSLOG) || | |
1435 | !uid_eq(cred->euid, cred->uid) || | |
1436 | !gid_eq(cred->egid, cred->gid)) | |
1437 | ptr = NULL; | |
1438 | break; | |
1439 | } | |
1440 | case 2: | |
1441 | default: | |
1442 | /* Always print 0's for %pK */ | |
1443 | ptr = NULL; | |
1444 | break; | |
1445 | } | |
1446 | break; | |
1447 | ||
1448 | case 'N': | |
1449 | switch (fmt[1]) { | |
1450 | case 'F': | |
1451 | return netdev_feature_string(buf, end, ptr, spec); | |
1452 | } | |
1453 | break; | |
1454 | case 'a': | |
1455 | return address_val(buf, end, ptr, spec, fmt); | |
1456 | case 'd': | |
1457 | return dentry_name(buf, end, ptr, spec, fmt); | |
1458 | case 'D': | |
1459 | return dentry_name(buf, end, | |
1460 | ((const struct file *)ptr)->f_path.dentry, | |
1461 | spec, fmt); | |
1462 | } | |
1463 | spec.flags |= SMALL; | |
1464 | if (spec.field_width == -1) { | |
1465 | spec.field_width = default_width; | |
1466 | spec.flags |= ZEROPAD; | |
1467 | } | |
1468 | spec.base = 16; | |
1469 | ||
1470 | return number(buf, end, (unsigned long) ptr, spec); | |
1471 | } | |
1472 | ||
1473 | /* | |
1474 | * Helper function to decode printf style format. | |
1475 | * Each call decode a token from the format and return the | |
1476 | * number of characters read (or likely the delta where it wants | |
1477 | * to go on the next call). | |
1478 | * The decoded token is returned through the parameters | |
1479 | * | |
1480 | * 'h', 'l', or 'L' for integer fields | |
1481 | * 'z' support added 23/7/1999 S.H. | |
1482 | * 'z' changed to 'Z' --davidm 1/25/99 | |
1483 | * 't' added for ptrdiff_t | |
1484 | * | |
1485 | * @fmt: the format string | |
1486 | * @type of the token returned | |
1487 | * @flags: various flags such as +, -, # tokens.. | |
1488 | * @field_width: overwritten width | |
1489 | * @base: base of the number (octal, hex, ...) | |
1490 | * @precision: precision of a number | |
1491 | * @qualifier: qualifier of a number (long, size_t, ...) | |
1492 | */ | |
1493 | static noinline_for_stack | |
1494 | int format_decode(const char *fmt, struct printf_spec *spec) | |
1495 | { | |
1496 | const char *start = fmt; | |
1497 | ||
1498 | /* we finished early by reading the field width */ | |
1499 | if (spec->type == FORMAT_TYPE_WIDTH) { | |
1500 | if (spec->field_width < 0) { | |
1501 | spec->field_width = -spec->field_width; | |
1502 | spec->flags |= LEFT; | |
1503 | } | |
1504 | spec->type = FORMAT_TYPE_NONE; | |
1505 | goto precision; | |
1506 | } | |
1507 | ||
1508 | /* we finished early by reading the precision */ | |
1509 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
1510 | if (spec->precision < 0) | |
1511 | spec->precision = 0; | |
1512 | ||
1513 | spec->type = FORMAT_TYPE_NONE; | |
1514 | goto qualifier; | |
1515 | } | |
1516 | ||
1517 | /* By default */ | |
1518 | spec->type = FORMAT_TYPE_NONE; | |
1519 | ||
1520 | for (; *fmt ; ++fmt) { | |
1521 | if (*fmt == '%') | |
1522 | break; | |
1523 | } | |
1524 | ||
1525 | /* Return the current non-format string */ | |
1526 | if (fmt != start || !*fmt) | |
1527 | return fmt - start; | |
1528 | ||
1529 | /* Process flags */ | |
1530 | spec->flags = 0; | |
1531 | ||
1532 | while (1) { /* this also skips first '%' */ | |
1533 | bool found = true; | |
1534 | ||
1535 | ++fmt; | |
1536 | ||
1537 | switch (*fmt) { | |
1538 | case '-': spec->flags |= LEFT; break; | |
1539 | case '+': spec->flags |= PLUS; break; | |
1540 | case ' ': spec->flags |= SPACE; break; | |
1541 | case '#': spec->flags |= SPECIAL; break; | |
1542 | case '0': spec->flags |= ZEROPAD; break; | |
1543 | default: found = false; | |
1544 | } | |
1545 | ||
1546 | if (!found) | |
1547 | break; | |
1548 | } | |
1549 | ||
1550 | /* get field width */ | |
1551 | spec->field_width = -1; | |
1552 | ||
1553 | if (isdigit(*fmt)) | |
1554 | spec->field_width = skip_atoi(&fmt); | |
1555 | else if (*fmt == '*') { | |
1556 | /* it's the next argument */ | |
1557 | spec->type = FORMAT_TYPE_WIDTH; | |
1558 | return ++fmt - start; | |
1559 | } | |
1560 | ||
1561 | precision: | |
1562 | /* get the precision */ | |
1563 | spec->precision = -1; | |
1564 | if (*fmt == '.') { | |
1565 | ++fmt; | |
1566 | if (isdigit(*fmt)) { | |
1567 | spec->precision = skip_atoi(&fmt); | |
1568 | if (spec->precision < 0) | |
1569 | spec->precision = 0; | |
1570 | } else if (*fmt == '*') { | |
1571 | /* it's the next argument */ | |
1572 | spec->type = FORMAT_TYPE_PRECISION; | |
1573 | return ++fmt - start; | |
1574 | } | |
1575 | } | |
1576 | ||
1577 | qualifier: | |
1578 | /* get the conversion qualifier */ | |
1579 | spec->qualifier = -1; | |
1580 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || | |
1581 | _tolower(*fmt) == 'z' || *fmt == 't') { | |
1582 | spec->qualifier = *fmt++; | |
1583 | if (unlikely(spec->qualifier == *fmt)) { | |
1584 | if (spec->qualifier == 'l') { | |
1585 | spec->qualifier = 'L'; | |
1586 | ++fmt; | |
1587 | } else if (spec->qualifier == 'h') { | |
1588 | spec->qualifier = 'H'; | |
1589 | ++fmt; | |
1590 | } | |
1591 | } | |
1592 | } | |
1593 | ||
1594 | /* default base */ | |
1595 | spec->base = 10; | |
1596 | switch (*fmt) { | |
1597 | case 'c': | |
1598 | spec->type = FORMAT_TYPE_CHAR; | |
1599 | return ++fmt - start; | |
1600 | ||
1601 | case 's': | |
1602 | spec->type = FORMAT_TYPE_STR; | |
1603 | return ++fmt - start; | |
1604 | ||
1605 | case 'p': | |
1606 | spec->type = FORMAT_TYPE_PTR; | |
1607 | return fmt - start; | |
1608 | /* skip alnum */ | |
1609 | ||
1610 | case '%': | |
1611 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
1612 | return ++fmt - start; | |
1613 | ||
1614 | /* integer number formats - set up the flags and "break" */ | |
1615 | case 'o': | |
1616 | spec->base = 8; | |
1617 | break; | |
1618 | ||
1619 | case 'x': | |
1620 | spec->flags |= SMALL; | |
1621 | ||
1622 | case 'X': | |
1623 | spec->base = 16; | |
1624 | break; | |
1625 | ||
1626 | case 'd': | |
1627 | case 'i': | |
1628 | spec->flags |= SIGN; | |
1629 | case 'u': | |
1630 | break; | |
1631 | ||
1632 | case 'n': | |
1633 | /* | |
1634 | * Since %n poses a greater security risk than utility, treat | |
1635 | * it as an invalid format specifier. Warn about its use so | |
1636 | * that new instances don't get added. | |
1637 | */ | |
1638 | WARN_ONCE(1, "Please remove ignored %%n in '%s'\n", fmt); | |
1639 | /* Fall-through */ | |
1640 | ||
1641 | default: | |
1642 | spec->type = FORMAT_TYPE_INVALID; | |
1643 | return fmt - start; | |
1644 | } | |
1645 | ||
1646 | if (spec->qualifier == 'L') | |
1647 | spec->type = FORMAT_TYPE_LONG_LONG; | |
1648 | else if (spec->qualifier == 'l') { | |
1649 | if (spec->flags & SIGN) | |
1650 | spec->type = FORMAT_TYPE_LONG; | |
1651 | else | |
1652 | spec->type = FORMAT_TYPE_ULONG; | |
1653 | } else if (_tolower(spec->qualifier) == 'z') { | |
1654 | spec->type = FORMAT_TYPE_SIZE_T; | |
1655 | } else if (spec->qualifier == 't') { | |
1656 | spec->type = FORMAT_TYPE_PTRDIFF; | |
1657 | } else if (spec->qualifier == 'H') { | |
1658 | if (spec->flags & SIGN) | |
1659 | spec->type = FORMAT_TYPE_BYTE; | |
1660 | else | |
1661 | spec->type = FORMAT_TYPE_UBYTE; | |
1662 | } else if (spec->qualifier == 'h') { | |
1663 | if (spec->flags & SIGN) | |
1664 | spec->type = FORMAT_TYPE_SHORT; | |
1665 | else | |
1666 | spec->type = FORMAT_TYPE_USHORT; | |
1667 | } else { | |
1668 | if (spec->flags & SIGN) | |
1669 | spec->type = FORMAT_TYPE_INT; | |
1670 | else | |
1671 | spec->type = FORMAT_TYPE_UINT; | |
1672 | } | |
1673 | ||
1674 | return ++fmt - start; | |
1675 | } | |
1676 | ||
1677 | /** | |
1678 | * vsnprintf - Format a string and place it in a buffer | |
1679 | * @buf: The buffer to place the result into | |
1680 | * @size: The size of the buffer, including the trailing null space | |
1681 | * @fmt: The format string to use | |
1682 | * @args: Arguments for the format string | |
1683 | * | |
1684 | * This function follows C99 vsnprintf, but has some extensions: | |
1685 | * %pS output the name of a text symbol with offset | |
1686 | * %ps output the name of a text symbol without offset | |
1687 | * %pF output the name of a function pointer with its offset | |
1688 | * %pf output the name of a function pointer without its offset | |
1689 | * %pB output the name of a backtrace symbol with its offset | |
1690 | * %pR output the address range in a struct resource with decoded flags | |
1691 | * %pr output the address range in a struct resource with raw flags | |
1692 | * %pM output a 6-byte MAC address with colons | |
1693 | * %pMR output a 6-byte MAC address with colons in reversed order | |
1694 | * %pMF output a 6-byte MAC address with dashes | |
1695 | * %pm output a 6-byte MAC address without colons | |
1696 | * %pmR output a 6-byte MAC address without colons in reversed order | |
1697 | * %pI4 print an IPv4 address without leading zeros | |
1698 | * %pi4 print an IPv4 address with leading zeros | |
1699 | * %pI6 print an IPv6 address with colons | |
1700 | * %pi6 print an IPv6 address without colons | |
1701 | * %pI6c print an IPv6 address as specified by RFC 5952 | |
1702 | * %pIS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address | |
1703 | * %piS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address | |
1704 | * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper | |
1705 | * case. | |
1706 | * %*pE[achnops] print an escaped buffer | |
1707 | * %*ph[CDN] a variable-length hex string with a separator (supports up to 64 | |
1708 | * bytes of the input) | |
1709 | * %n is ignored | |
1710 | * | |
1711 | * ** Please update Documentation/printk-formats.txt when making changes ** | |
1712 | * | |
1713 | * The return value is the number of characters which would | |
1714 | * be generated for the given input, excluding the trailing | |
1715 | * '\0', as per ISO C99. If you want to have the exact | |
1716 | * number of characters written into @buf as return value | |
1717 | * (not including the trailing '\0'), use vscnprintf(). If the | |
1718 | * return is greater than or equal to @size, the resulting | |
1719 | * string is truncated. | |
1720 | * | |
1721 | * If you're not already dealing with a va_list consider using snprintf(). | |
1722 | */ | |
1723 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1724 | { | |
1725 | unsigned long long num; | |
1726 | char *str, *end; | |
1727 | struct printf_spec spec = {0}; | |
1728 | ||
1729 | /* Reject out-of-range values early. Large positive sizes are | |
1730 | used for unknown buffer sizes. */ | |
1731 | if (WARN_ON_ONCE((int) size < 0)) | |
1732 | return 0; | |
1733 | ||
1734 | str = buf; | |
1735 | end = buf + size; | |
1736 | ||
1737 | /* Make sure end is always >= buf */ | |
1738 | if (end < buf) { | |
1739 | end = ((void *)-1); | |
1740 | size = end - buf; | |
1741 | } | |
1742 | ||
1743 | while (*fmt) { | |
1744 | const char *old_fmt = fmt; | |
1745 | int read = format_decode(fmt, &spec); | |
1746 | ||
1747 | fmt += read; | |
1748 | ||
1749 | switch (spec.type) { | |
1750 | case FORMAT_TYPE_NONE: { | |
1751 | int copy = read; | |
1752 | if (str < end) { | |
1753 | if (copy > end - str) | |
1754 | copy = end - str; | |
1755 | memcpy(str, old_fmt, copy); | |
1756 | } | |
1757 | str += read; | |
1758 | break; | |
1759 | } | |
1760 | ||
1761 | case FORMAT_TYPE_WIDTH: | |
1762 | spec.field_width = va_arg(args, int); | |
1763 | break; | |
1764 | ||
1765 | case FORMAT_TYPE_PRECISION: | |
1766 | spec.precision = va_arg(args, int); | |
1767 | break; | |
1768 | ||
1769 | case FORMAT_TYPE_CHAR: { | |
1770 | char c; | |
1771 | ||
1772 | if (!(spec.flags & LEFT)) { | |
1773 | while (--spec.field_width > 0) { | |
1774 | if (str < end) | |
1775 | *str = ' '; | |
1776 | ++str; | |
1777 | ||
1778 | } | |
1779 | } | |
1780 | c = (unsigned char) va_arg(args, int); | |
1781 | if (str < end) | |
1782 | *str = c; | |
1783 | ++str; | |
1784 | while (--spec.field_width > 0) { | |
1785 | if (str < end) | |
1786 | *str = ' '; | |
1787 | ++str; | |
1788 | } | |
1789 | break; | |
1790 | } | |
1791 | ||
1792 | case FORMAT_TYPE_STR: | |
1793 | str = string(str, end, va_arg(args, char *), spec); | |
1794 | break; | |
1795 | ||
1796 | case FORMAT_TYPE_PTR: | |
1797 | str = pointer(fmt+1, str, end, va_arg(args, void *), | |
1798 | spec); | |
1799 | while (isalnum(*fmt)) | |
1800 | fmt++; | |
1801 | break; | |
1802 | ||
1803 | case FORMAT_TYPE_PERCENT_CHAR: | |
1804 | if (str < end) | |
1805 | *str = '%'; | |
1806 | ++str; | |
1807 | break; | |
1808 | ||
1809 | case FORMAT_TYPE_INVALID: | |
1810 | if (str < end) | |
1811 | *str = '%'; | |
1812 | ++str; | |
1813 | break; | |
1814 | ||
1815 | default: | |
1816 | switch (spec.type) { | |
1817 | case FORMAT_TYPE_LONG_LONG: | |
1818 | num = va_arg(args, long long); | |
1819 | break; | |
1820 | case FORMAT_TYPE_ULONG: | |
1821 | num = va_arg(args, unsigned long); | |
1822 | break; | |
1823 | case FORMAT_TYPE_LONG: | |
1824 | num = va_arg(args, long); | |
1825 | break; | |
1826 | case FORMAT_TYPE_SIZE_T: | |
1827 | if (spec.flags & SIGN) | |
1828 | num = va_arg(args, ssize_t); | |
1829 | else | |
1830 | num = va_arg(args, size_t); | |
1831 | break; | |
1832 | case FORMAT_TYPE_PTRDIFF: | |
1833 | num = va_arg(args, ptrdiff_t); | |
1834 | break; | |
1835 | case FORMAT_TYPE_UBYTE: | |
1836 | num = (unsigned char) va_arg(args, int); | |
1837 | break; | |
1838 | case FORMAT_TYPE_BYTE: | |
1839 | num = (signed char) va_arg(args, int); | |
1840 | break; | |
1841 | case FORMAT_TYPE_USHORT: | |
1842 | num = (unsigned short) va_arg(args, int); | |
1843 | break; | |
1844 | case FORMAT_TYPE_SHORT: | |
1845 | num = (short) va_arg(args, int); | |
1846 | break; | |
1847 | case FORMAT_TYPE_INT: | |
1848 | num = (int) va_arg(args, int); | |
1849 | break; | |
1850 | default: | |
1851 | num = va_arg(args, unsigned int); | |
1852 | } | |
1853 | ||
1854 | str = number(str, end, num, spec); | |
1855 | } | |
1856 | } | |
1857 | ||
1858 | if (size > 0) { | |
1859 | if (str < end) | |
1860 | *str = '\0'; | |
1861 | else | |
1862 | end[-1] = '\0'; | |
1863 | } | |
1864 | ||
1865 | /* the trailing null byte doesn't count towards the total */ | |
1866 | return str-buf; | |
1867 | ||
1868 | } | |
1869 | EXPORT_SYMBOL(vsnprintf); | |
1870 | ||
1871 | /** | |
1872 | * vscnprintf - Format a string and place it in a buffer | |
1873 | * @buf: The buffer to place the result into | |
1874 | * @size: The size of the buffer, including the trailing null space | |
1875 | * @fmt: The format string to use | |
1876 | * @args: Arguments for the format string | |
1877 | * | |
1878 | * The return value is the number of characters which have been written into | |
1879 | * the @buf not including the trailing '\0'. If @size is == 0 the function | |
1880 | * returns 0. | |
1881 | * | |
1882 | * If you're not already dealing with a va_list consider using scnprintf(). | |
1883 | * | |
1884 | * See the vsnprintf() documentation for format string extensions over C99. | |
1885 | */ | |
1886 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1887 | { | |
1888 | int i; | |
1889 | ||
1890 | i = vsnprintf(buf, size, fmt, args); | |
1891 | ||
1892 | if (likely(i < size)) | |
1893 | return i; | |
1894 | if (size != 0) | |
1895 | return size - 1; | |
1896 | return 0; | |
1897 | } | |
1898 | EXPORT_SYMBOL(vscnprintf); | |
1899 | ||
1900 | /** | |
1901 | * snprintf - Format a string and place it in a buffer | |
1902 | * @buf: The buffer to place the result into | |
1903 | * @size: The size of the buffer, including the trailing null space | |
1904 | * @fmt: The format string to use | |
1905 | * @...: Arguments for the format string | |
1906 | * | |
1907 | * The return value is the number of characters which would be | |
1908 | * generated for the given input, excluding the trailing null, | |
1909 | * as per ISO C99. If the return is greater than or equal to | |
1910 | * @size, the resulting string is truncated. | |
1911 | * | |
1912 | * See the vsnprintf() documentation for format string extensions over C99. | |
1913 | */ | |
1914 | int snprintf(char *buf, size_t size, const char *fmt, ...) | |
1915 | { | |
1916 | va_list args; | |
1917 | int i; | |
1918 | ||
1919 | va_start(args, fmt); | |
1920 | i = vsnprintf(buf, size, fmt, args); | |
1921 | va_end(args); | |
1922 | ||
1923 | return i; | |
1924 | } | |
1925 | EXPORT_SYMBOL(snprintf); | |
1926 | ||
1927 | /** | |
1928 | * scnprintf - Format a string and place it in a buffer | |
1929 | * @buf: The buffer to place the result into | |
1930 | * @size: The size of the buffer, including the trailing null space | |
1931 | * @fmt: The format string to use | |
1932 | * @...: Arguments for the format string | |
1933 | * | |
1934 | * The return value is the number of characters written into @buf not including | |
1935 | * the trailing '\0'. If @size is == 0 the function returns 0. | |
1936 | */ | |
1937 | ||
1938 | int scnprintf(char *buf, size_t size, const char *fmt, ...) | |
1939 | { | |
1940 | va_list args; | |
1941 | int i; | |
1942 | ||
1943 | va_start(args, fmt); | |
1944 | i = vscnprintf(buf, size, fmt, args); | |
1945 | va_end(args); | |
1946 | ||
1947 | return i; | |
1948 | } | |
1949 | EXPORT_SYMBOL(scnprintf); | |
1950 | ||
1951 | /** | |
1952 | * vsprintf - Format a string and place it in a buffer | |
1953 | * @buf: The buffer to place the result into | |
1954 | * @fmt: The format string to use | |
1955 | * @args: Arguments for the format string | |
1956 | * | |
1957 | * The function returns the number of characters written | |
1958 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid | |
1959 | * buffer overflows. | |
1960 | * | |
1961 | * If you're not already dealing with a va_list consider using sprintf(). | |
1962 | * | |
1963 | * See the vsnprintf() documentation for format string extensions over C99. | |
1964 | */ | |
1965 | int vsprintf(char *buf, const char *fmt, va_list args) | |
1966 | { | |
1967 | return vsnprintf(buf, INT_MAX, fmt, args); | |
1968 | } | |
1969 | EXPORT_SYMBOL(vsprintf); | |
1970 | ||
1971 | /** | |
1972 | * sprintf - Format a string and place it in a buffer | |
1973 | * @buf: The buffer to place the result into | |
1974 | * @fmt: The format string to use | |
1975 | * @...: Arguments for the format string | |
1976 | * | |
1977 | * The function returns the number of characters written | |
1978 | * into @buf. Use snprintf() or scnprintf() in order to avoid | |
1979 | * buffer overflows. | |
1980 | * | |
1981 | * See the vsnprintf() documentation for format string extensions over C99. | |
1982 | */ | |
1983 | int sprintf(char *buf, const char *fmt, ...) | |
1984 | { | |
1985 | va_list args; | |
1986 | int i; | |
1987 | ||
1988 | va_start(args, fmt); | |
1989 | i = vsnprintf(buf, INT_MAX, fmt, args); | |
1990 | va_end(args); | |
1991 | ||
1992 | return i; | |
1993 | } | |
1994 | EXPORT_SYMBOL(sprintf); | |
1995 | ||
1996 | #ifdef CONFIG_BINARY_PRINTF | |
1997 | /* | |
1998 | * bprintf service: | |
1999 | * vbin_printf() - VA arguments to binary data | |
2000 | * bstr_printf() - Binary data to text string | |
2001 | */ | |
2002 | ||
2003 | /** | |
2004 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
2005 | * @bin_buf: The buffer to place args' binary value | |
2006 | * @size: The size of the buffer(by words(32bits), not characters) | |
2007 | * @fmt: The format string to use | |
2008 | * @args: Arguments for the format string | |
2009 | * | |
2010 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
2011 | * is skipped. | |
2012 | * | |
2013 | * The return value is the number of words(32bits) which would be generated for | |
2014 | * the given input. | |
2015 | * | |
2016 | * NOTE: | |
2017 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
2018 | * valid for bstr_printf(). | |
2019 | */ | |
2020 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
2021 | { | |
2022 | struct printf_spec spec = {0}; | |
2023 | char *str, *end; | |
2024 | ||
2025 | str = (char *)bin_buf; | |
2026 | end = (char *)(bin_buf + size); | |
2027 | ||
2028 | #define save_arg(type) \ | |
2029 | do { \ | |
2030 | if (sizeof(type) == 8) { \ | |
2031 | unsigned long long value; \ | |
2032 | str = PTR_ALIGN(str, sizeof(u32)); \ | |
2033 | value = va_arg(args, unsigned long long); \ | |
2034 | if (str + sizeof(type) <= end) { \ | |
2035 | *(u32 *)str = *(u32 *)&value; \ | |
2036 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ | |
2037 | } \ | |
2038 | } else { \ | |
2039 | unsigned long value; \ | |
2040 | str = PTR_ALIGN(str, sizeof(type)); \ | |
2041 | value = va_arg(args, int); \ | |
2042 | if (str + sizeof(type) <= end) \ | |
2043 | *(typeof(type) *)str = (type)value; \ | |
2044 | } \ | |
2045 | str += sizeof(type); \ | |
2046 | } while (0) | |
2047 | ||
2048 | while (*fmt) { | |
2049 | int read = format_decode(fmt, &spec); | |
2050 | ||
2051 | fmt += read; | |
2052 | ||
2053 | switch (spec.type) { | |
2054 | case FORMAT_TYPE_NONE: | |
2055 | case FORMAT_TYPE_INVALID: | |
2056 | case FORMAT_TYPE_PERCENT_CHAR: | |
2057 | break; | |
2058 | ||
2059 | case FORMAT_TYPE_WIDTH: | |
2060 | case FORMAT_TYPE_PRECISION: | |
2061 | save_arg(int); | |
2062 | break; | |
2063 | ||
2064 | case FORMAT_TYPE_CHAR: | |
2065 | save_arg(char); | |
2066 | break; | |
2067 | ||
2068 | case FORMAT_TYPE_STR: { | |
2069 | const char *save_str = va_arg(args, char *); | |
2070 | size_t len; | |
2071 | ||
2072 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE | |
2073 | || (unsigned long)save_str < PAGE_SIZE) | |
2074 | save_str = "(null)"; | |
2075 | len = strlen(save_str) + 1; | |
2076 | if (str + len < end) | |
2077 | memcpy(str, save_str, len); | |
2078 | str += len; | |
2079 | break; | |
2080 | } | |
2081 | ||
2082 | case FORMAT_TYPE_PTR: | |
2083 | save_arg(void *); | |
2084 | /* skip all alphanumeric pointer suffixes */ | |
2085 | while (isalnum(*fmt)) | |
2086 | fmt++; | |
2087 | break; | |
2088 | ||
2089 | default: | |
2090 | switch (spec.type) { | |
2091 | ||
2092 | case FORMAT_TYPE_LONG_LONG: | |
2093 | save_arg(long long); | |
2094 | break; | |
2095 | case FORMAT_TYPE_ULONG: | |
2096 | case FORMAT_TYPE_LONG: | |
2097 | save_arg(unsigned long); | |
2098 | break; | |
2099 | case FORMAT_TYPE_SIZE_T: | |
2100 | save_arg(size_t); | |
2101 | break; | |
2102 | case FORMAT_TYPE_PTRDIFF: | |
2103 | save_arg(ptrdiff_t); | |
2104 | break; | |
2105 | case FORMAT_TYPE_UBYTE: | |
2106 | case FORMAT_TYPE_BYTE: | |
2107 | save_arg(char); | |
2108 | break; | |
2109 | case FORMAT_TYPE_USHORT: | |
2110 | case FORMAT_TYPE_SHORT: | |
2111 | save_arg(short); | |
2112 | break; | |
2113 | default: | |
2114 | save_arg(int); | |
2115 | } | |
2116 | } | |
2117 | } | |
2118 | ||
2119 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; | |
2120 | #undef save_arg | |
2121 | } | |
2122 | EXPORT_SYMBOL_GPL(vbin_printf); | |
2123 | ||
2124 | /** | |
2125 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
2126 | * @buf: The buffer to place the result into | |
2127 | * @size: The size of the buffer, including the trailing null space | |
2128 | * @fmt: The format string to use | |
2129 | * @bin_buf: Binary arguments for the format string | |
2130 | * | |
2131 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
2132 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
2133 | * a binary buffer that generated by vbin_printf. | |
2134 | * | |
2135 | * The format follows C99 vsnprintf, but has some extensions: | |
2136 | * see vsnprintf comment for details. | |
2137 | * | |
2138 | * The return value is the number of characters which would | |
2139 | * be generated for the given input, excluding the trailing | |
2140 | * '\0', as per ISO C99. If you want to have the exact | |
2141 | * number of characters written into @buf as return value | |
2142 | * (not including the trailing '\0'), use vscnprintf(). If the | |
2143 | * return is greater than or equal to @size, the resulting | |
2144 | * string is truncated. | |
2145 | */ | |
2146 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
2147 | { | |
2148 | struct printf_spec spec = {0}; | |
2149 | char *str, *end; | |
2150 | const char *args = (const char *)bin_buf; | |
2151 | ||
2152 | if (WARN_ON_ONCE((int) size < 0)) | |
2153 | return 0; | |
2154 | ||
2155 | str = buf; | |
2156 | end = buf + size; | |
2157 | ||
2158 | #define get_arg(type) \ | |
2159 | ({ \ | |
2160 | typeof(type) value; \ | |
2161 | if (sizeof(type) == 8) { \ | |
2162 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
2163 | *(u32 *)&value = *(u32 *)args; \ | |
2164 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
2165 | } else { \ | |
2166 | args = PTR_ALIGN(args, sizeof(type)); \ | |
2167 | value = *(typeof(type) *)args; \ | |
2168 | } \ | |
2169 | args += sizeof(type); \ | |
2170 | value; \ | |
2171 | }) | |
2172 | ||
2173 | /* Make sure end is always >= buf */ | |
2174 | if (end < buf) { | |
2175 | end = ((void *)-1); | |
2176 | size = end - buf; | |
2177 | } | |
2178 | ||
2179 | while (*fmt) { | |
2180 | const char *old_fmt = fmt; | |
2181 | int read = format_decode(fmt, &spec); | |
2182 | ||
2183 | fmt += read; | |
2184 | ||
2185 | switch (spec.type) { | |
2186 | case FORMAT_TYPE_NONE: { | |
2187 | int copy = read; | |
2188 | if (str < end) { | |
2189 | if (copy > end - str) | |
2190 | copy = end - str; | |
2191 | memcpy(str, old_fmt, copy); | |
2192 | } | |
2193 | str += read; | |
2194 | break; | |
2195 | } | |
2196 | ||
2197 | case FORMAT_TYPE_WIDTH: | |
2198 | spec.field_width = get_arg(int); | |
2199 | break; | |
2200 | ||
2201 | case FORMAT_TYPE_PRECISION: | |
2202 | spec.precision = get_arg(int); | |
2203 | break; | |
2204 | ||
2205 | case FORMAT_TYPE_CHAR: { | |
2206 | char c; | |
2207 | ||
2208 | if (!(spec.flags & LEFT)) { | |
2209 | while (--spec.field_width > 0) { | |
2210 | if (str < end) | |
2211 | *str = ' '; | |
2212 | ++str; | |
2213 | } | |
2214 | } | |
2215 | c = (unsigned char) get_arg(char); | |
2216 | if (str < end) | |
2217 | *str = c; | |
2218 | ++str; | |
2219 | while (--spec.field_width > 0) { | |
2220 | if (str < end) | |
2221 | *str = ' '; | |
2222 | ++str; | |
2223 | } | |
2224 | break; | |
2225 | } | |
2226 | ||
2227 | case FORMAT_TYPE_STR: { | |
2228 | const char *str_arg = args; | |
2229 | args += strlen(str_arg) + 1; | |
2230 | str = string(str, end, (char *)str_arg, spec); | |
2231 | break; | |
2232 | } | |
2233 | ||
2234 | case FORMAT_TYPE_PTR: | |
2235 | str = pointer(fmt+1, str, end, get_arg(void *), spec); | |
2236 | while (isalnum(*fmt)) | |
2237 | fmt++; | |
2238 | break; | |
2239 | ||
2240 | case FORMAT_TYPE_PERCENT_CHAR: | |
2241 | case FORMAT_TYPE_INVALID: | |
2242 | if (str < end) | |
2243 | *str = '%'; | |
2244 | ++str; | |
2245 | break; | |
2246 | ||
2247 | default: { | |
2248 | unsigned long long num; | |
2249 | ||
2250 | switch (spec.type) { | |
2251 | ||
2252 | case FORMAT_TYPE_LONG_LONG: | |
2253 | num = get_arg(long long); | |
2254 | break; | |
2255 | case FORMAT_TYPE_ULONG: | |
2256 | case FORMAT_TYPE_LONG: | |
2257 | num = get_arg(unsigned long); | |
2258 | break; | |
2259 | case FORMAT_TYPE_SIZE_T: | |
2260 | num = get_arg(size_t); | |
2261 | break; | |
2262 | case FORMAT_TYPE_PTRDIFF: | |
2263 | num = get_arg(ptrdiff_t); | |
2264 | break; | |
2265 | case FORMAT_TYPE_UBYTE: | |
2266 | num = get_arg(unsigned char); | |
2267 | break; | |
2268 | case FORMAT_TYPE_BYTE: | |
2269 | num = get_arg(signed char); | |
2270 | break; | |
2271 | case FORMAT_TYPE_USHORT: | |
2272 | num = get_arg(unsigned short); | |
2273 | break; | |
2274 | case FORMAT_TYPE_SHORT: | |
2275 | num = get_arg(short); | |
2276 | break; | |
2277 | case FORMAT_TYPE_UINT: | |
2278 | num = get_arg(unsigned int); | |
2279 | break; | |
2280 | default: | |
2281 | num = get_arg(int); | |
2282 | } | |
2283 | ||
2284 | str = number(str, end, num, spec); | |
2285 | } /* default: */ | |
2286 | } /* switch(spec.type) */ | |
2287 | } /* while(*fmt) */ | |
2288 | ||
2289 | if (size > 0) { | |
2290 | if (str < end) | |
2291 | *str = '\0'; | |
2292 | else | |
2293 | end[-1] = '\0'; | |
2294 | } | |
2295 | ||
2296 | #undef get_arg | |
2297 | ||
2298 | /* the trailing null byte doesn't count towards the total */ | |
2299 | return str - buf; | |
2300 | } | |
2301 | EXPORT_SYMBOL_GPL(bstr_printf); | |
2302 | ||
2303 | /** | |
2304 | * bprintf - Parse a format string and place args' binary value in a buffer | |
2305 | * @bin_buf: The buffer to place args' binary value | |
2306 | * @size: The size of the buffer(by words(32bits), not characters) | |
2307 | * @fmt: The format string to use | |
2308 | * @...: Arguments for the format string | |
2309 | * | |
2310 | * The function returns the number of words(u32) written | |
2311 | * into @bin_buf. | |
2312 | */ | |
2313 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
2314 | { | |
2315 | va_list args; | |
2316 | int ret; | |
2317 | ||
2318 | va_start(args, fmt); | |
2319 | ret = vbin_printf(bin_buf, size, fmt, args); | |
2320 | va_end(args); | |
2321 | ||
2322 | return ret; | |
2323 | } | |
2324 | EXPORT_SYMBOL_GPL(bprintf); | |
2325 | ||
2326 | #endif /* CONFIG_BINARY_PRINTF */ | |
2327 | ||
2328 | /** | |
2329 | * vsscanf - Unformat a buffer into a list of arguments | |
2330 | * @buf: input buffer | |
2331 | * @fmt: format of buffer | |
2332 | * @args: arguments | |
2333 | */ | |
2334 | int vsscanf(const char *buf, const char *fmt, va_list args) | |
2335 | { | |
2336 | const char *str = buf; | |
2337 | char *next; | |
2338 | char digit; | |
2339 | int num = 0; | |
2340 | u8 qualifier; | |
2341 | unsigned int base; | |
2342 | union { | |
2343 | long long s; | |
2344 | unsigned long long u; | |
2345 | } val; | |
2346 | s16 field_width; | |
2347 | bool is_sign; | |
2348 | ||
2349 | while (*fmt) { | |
2350 | /* skip any white space in format */ | |
2351 | /* white space in format matchs any amount of | |
2352 | * white space, including none, in the input. | |
2353 | */ | |
2354 | if (isspace(*fmt)) { | |
2355 | fmt = skip_spaces(++fmt); | |
2356 | str = skip_spaces(str); | |
2357 | } | |
2358 | ||
2359 | /* anything that is not a conversion must match exactly */ | |
2360 | if (*fmt != '%' && *fmt) { | |
2361 | if (*fmt++ != *str++) | |
2362 | break; | |
2363 | continue; | |
2364 | } | |
2365 | ||
2366 | if (!*fmt) | |
2367 | break; | |
2368 | ++fmt; | |
2369 | ||
2370 | /* skip this conversion. | |
2371 | * advance both strings to next white space | |
2372 | */ | |
2373 | if (*fmt == '*') { | |
2374 | if (!*str) | |
2375 | break; | |
2376 | while (!isspace(*fmt) && *fmt != '%' && *fmt) | |
2377 | fmt++; | |
2378 | while (!isspace(*str) && *str) | |
2379 | str++; | |
2380 | continue; | |
2381 | } | |
2382 | ||
2383 | /* get field width */ | |
2384 | field_width = -1; | |
2385 | if (isdigit(*fmt)) { | |
2386 | field_width = skip_atoi(&fmt); | |
2387 | if (field_width <= 0) | |
2388 | break; | |
2389 | } | |
2390 | ||
2391 | /* get conversion qualifier */ | |
2392 | qualifier = -1; | |
2393 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || | |
2394 | _tolower(*fmt) == 'z') { | |
2395 | qualifier = *fmt++; | |
2396 | if (unlikely(qualifier == *fmt)) { | |
2397 | if (qualifier == 'h') { | |
2398 | qualifier = 'H'; | |
2399 | fmt++; | |
2400 | } else if (qualifier == 'l') { | |
2401 | qualifier = 'L'; | |
2402 | fmt++; | |
2403 | } | |
2404 | } | |
2405 | } | |
2406 | ||
2407 | if (!*fmt) | |
2408 | break; | |
2409 | ||
2410 | if (*fmt == 'n') { | |
2411 | /* return number of characters read so far */ | |
2412 | *va_arg(args, int *) = str - buf; | |
2413 | ++fmt; | |
2414 | continue; | |
2415 | } | |
2416 | ||
2417 | if (!*str) | |
2418 | break; | |
2419 | ||
2420 | base = 10; | |
2421 | is_sign = false; | |
2422 | ||
2423 | switch (*fmt++) { | |
2424 | case 'c': | |
2425 | { | |
2426 | char *s = (char *)va_arg(args, char*); | |
2427 | if (field_width == -1) | |
2428 | field_width = 1; | |
2429 | do { | |
2430 | *s++ = *str++; | |
2431 | } while (--field_width > 0 && *str); | |
2432 | num++; | |
2433 | } | |
2434 | continue; | |
2435 | case 's': | |
2436 | { | |
2437 | char *s = (char *)va_arg(args, char *); | |
2438 | if (field_width == -1) | |
2439 | field_width = SHRT_MAX; | |
2440 | /* first, skip leading white space in buffer */ | |
2441 | str = skip_spaces(str); | |
2442 | ||
2443 | /* now copy until next white space */ | |
2444 | while (*str && !isspace(*str) && field_width--) | |
2445 | *s++ = *str++; | |
2446 | *s = '\0'; | |
2447 | num++; | |
2448 | } | |
2449 | continue; | |
2450 | case 'o': | |
2451 | base = 8; | |
2452 | break; | |
2453 | case 'x': | |
2454 | case 'X': | |
2455 | base = 16; | |
2456 | break; | |
2457 | case 'i': | |
2458 | base = 0; | |
2459 | case 'd': | |
2460 | is_sign = true; | |
2461 | case 'u': | |
2462 | break; | |
2463 | case '%': | |
2464 | /* looking for '%' in str */ | |
2465 | if (*str++ != '%') | |
2466 | return num; | |
2467 | continue; | |
2468 | default: | |
2469 | /* invalid format; stop here */ | |
2470 | return num; | |
2471 | } | |
2472 | ||
2473 | /* have some sort of integer conversion. | |
2474 | * first, skip white space in buffer. | |
2475 | */ | |
2476 | str = skip_spaces(str); | |
2477 | ||
2478 | digit = *str; | |
2479 | if (is_sign && digit == '-') | |
2480 | digit = *(str + 1); | |
2481 | ||
2482 | if (!digit | |
2483 | || (base == 16 && !isxdigit(digit)) | |
2484 | || (base == 10 && !isdigit(digit)) | |
2485 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
2486 | || (base == 0 && !isdigit(digit))) | |
2487 | break; | |
2488 | ||
2489 | if (is_sign) | |
2490 | val.s = qualifier != 'L' ? | |
2491 | simple_strtol(str, &next, base) : | |
2492 | simple_strtoll(str, &next, base); | |
2493 | else | |
2494 | val.u = qualifier != 'L' ? | |
2495 | simple_strtoul(str, &next, base) : | |
2496 | simple_strtoull(str, &next, base); | |
2497 | ||
2498 | if (field_width > 0 && next - str > field_width) { | |
2499 | if (base == 0) | |
2500 | _parse_integer_fixup_radix(str, &base); | |
2501 | while (next - str > field_width) { | |
2502 | if (is_sign) | |
2503 | val.s = div_s64(val.s, base); | |
2504 | else | |
2505 | val.u = div_u64(val.u, base); | |
2506 | --next; | |
2507 | } | |
2508 | } | |
2509 | ||
2510 | switch (qualifier) { | |
2511 | case 'H': /* that's 'hh' in format */ | |
2512 | if (is_sign) | |
2513 | *va_arg(args, signed char *) = val.s; | |
2514 | else | |
2515 | *va_arg(args, unsigned char *) = val.u; | |
2516 | break; | |
2517 | case 'h': | |
2518 | if (is_sign) | |
2519 | *va_arg(args, short *) = val.s; | |
2520 | else | |
2521 | *va_arg(args, unsigned short *) = val.u; | |
2522 | break; | |
2523 | case 'l': | |
2524 | if (is_sign) | |
2525 | *va_arg(args, long *) = val.s; | |
2526 | else | |
2527 | *va_arg(args, unsigned long *) = val.u; | |
2528 | break; | |
2529 | case 'L': | |
2530 | if (is_sign) | |
2531 | *va_arg(args, long long *) = val.s; | |
2532 | else | |
2533 | *va_arg(args, unsigned long long *) = val.u; | |
2534 | break; | |
2535 | case 'Z': | |
2536 | case 'z': | |
2537 | *va_arg(args, size_t *) = val.u; | |
2538 | break; | |
2539 | default: | |
2540 | if (is_sign) | |
2541 | *va_arg(args, int *) = val.s; | |
2542 | else | |
2543 | *va_arg(args, unsigned int *) = val.u; | |
2544 | break; | |
2545 | } | |
2546 | num++; | |
2547 | ||
2548 | if (!next) | |
2549 | break; | |
2550 | str = next; | |
2551 | } | |
2552 | ||
2553 | return num; | |
2554 | } | |
2555 | EXPORT_SYMBOL(vsscanf); | |
2556 | ||
2557 | /** | |
2558 | * sscanf - Unformat a buffer into a list of arguments | |
2559 | * @buf: input buffer | |
2560 | * @fmt: formatting of buffer | |
2561 | * @...: resulting arguments | |
2562 | */ | |
2563 | int sscanf(const char *buf, const char *fmt, ...) | |
2564 | { | |
2565 | va_list args; | |
2566 | int i; | |
2567 | ||
2568 | va_start(args, fmt); | |
2569 | i = vsscanf(buf, fmt, args); | |
2570 | va_end(args); | |
2571 | ||
2572 | return i; | |
2573 | } | |
2574 | EXPORT_SYMBOL(sscanf); |