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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/lib/vsprintf.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | */ | |
6 | ||
7 | /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */ | |
8 | /* | |
9 | * Wirzenius wrote this portably, Torvalds fucked it up :-) | |
10 | */ | |
11 | ||
7b9186f5 | 12 | /* |
1da177e4 LT |
13 | * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com> |
14 | * - changed to provide snprintf and vsnprintf functions | |
15 | * So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de> | |
16 | * - scnprintf and vscnprintf | |
17 | */ | |
18 | ||
19 | #include <stdarg.h> | |
8bc3bcc9 | 20 | #include <linux/module.h> /* for KSYM_SYMBOL_LEN */ |
1da177e4 LT |
21 | #include <linux/types.h> |
22 | #include <linux/string.h> | |
23 | #include <linux/ctype.h> | |
24 | #include <linux/kernel.h> | |
0fe1ef24 | 25 | #include <linux/kallsyms.h> |
53809751 | 26 | #include <linux/math64.h> |
0fe1ef24 | 27 | #include <linux/uaccess.h> |
332d2e78 | 28 | #include <linux/ioport.h> |
4b6ccca7 | 29 | #include <linux/dcache.h> |
312b4e22 | 30 | #include <linux/cred.h> |
8a27f7c9 | 31 | #include <net/addrconf.h> |
1da177e4 | 32 | |
4e57b681 | 33 | #include <asm/page.h> /* for PAGE_SIZE */ |
deac93df | 34 | #include <asm/sections.h> /* for dereference_function_descriptor() */ |
1da177e4 | 35 | |
71dca95d | 36 | #include <linux/string_helpers.h> |
1dff46d6 | 37 | #include "kstrtox.h" |
aa46a63e | 38 | |
1da177e4 | 39 | /** |
922ac25c | 40 | * simple_strtoull - convert a string to an unsigned long long |
1da177e4 LT |
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 | |
462e4711 EZ |
44 | * |
45 | * This function is obsolete. Please use kstrtoull instead. | |
1da177e4 | 46 | */ |
922ac25c | 47 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
1da177e4 | 48 | { |
1dff46d6 AD |
49 | unsigned long long result; |
50 | unsigned int rv; | |
aa46a63e | 51 | |
1dff46d6 AD |
52 | cp = _parse_integer_fixup_radix(cp, &base); |
53 | rv = _parse_integer(cp, base, &result); | |
54 | /* FIXME */ | |
55 | cp += (rv & ~KSTRTOX_OVERFLOW); | |
aa46a63e | 56 | |
1da177e4 LT |
57 | if (endp) |
58 | *endp = (char *)cp; | |
7b9186f5 | 59 | |
1da177e4 LT |
60 | return result; |
61 | } | |
922ac25c | 62 | EXPORT_SYMBOL(simple_strtoull); |
1da177e4 LT |
63 | |
64 | /** | |
922ac25c | 65 | * simple_strtoul - convert a string to an unsigned long |
1da177e4 LT |
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 | |
462e4711 EZ |
69 | * |
70 | * This function is obsolete. Please use kstrtoul instead. | |
1da177e4 | 71 | */ |
922ac25c | 72 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
1da177e4 | 73 | { |
922ac25c | 74 | return simple_strtoull(cp, endp, base); |
1da177e4 | 75 | } |
922ac25c | 76 | EXPORT_SYMBOL(simple_strtoul); |
1da177e4 LT |
77 | |
78 | /** | |
922ac25c | 79 | * simple_strtol - convert a string to a signed long |
1da177e4 LT |
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 | |
462e4711 EZ |
83 | * |
84 | * This function is obsolete. Please use kstrtol instead. | |
1da177e4 | 85 | */ |
922ac25c | 86 | long simple_strtol(const char *cp, char **endp, unsigned int base) |
1da177e4 | 87 | { |
922ac25c AGR |
88 | if (*cp == '-') |
89 | return -simple_strtoul(cp + 1, endp, base); | |
7b9186f5 | 90 | |
922ac25c | 91 | return simple_strtoul(cp, endp, base); |
1da177e4 | 92 | } |
922ac25c | 93 | EXPORT_SYMBOL(simple_strtol); |
1da177e4 LT |
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 | |
462e4711 EZ |
100 | * |
101 | * This function is obsolete. Please use kstrtoll instead. | |
1da177e4 | 102 | */ |
22d27051 | 103 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
1da177e4 | 104 | { |
7b9186f5 | 105 | if (*cp == '-') |
22d27051 | 106 | return -simple_strtoull(cp + 1, endp, base); |
7b9186f5 | 107 | |
22d27051 | 108 | return simple_strtoull(cp, endp, base); |
1da177e4 | 109 | } |
98d5ce0d | 110 | EXPORT_SYMBOL(simple_strtoll); |
1da177e4 | 111 | |
cf3b429b JP |
112 | static noinline_for_stack |
113 | int skip_atoi(const char **s) | |
1da177e4 | 114 | { |
7b9186f5 | 115 | int i = 0; |
1da177e4 | 116 | |
43e5b666 | 117 | do { |
1da177e4 | 118 | i = i*10 + *((*s)++) - '0'; |
43e5b666 | 119 | } while (isdigit(**s)); |
7b9186f5 | 120 | |
1da177e4 LT |
121 | return i; |
122 | } | |
123 | ||
4277eedd DV |
124 | /* Decimal conversion is by far the most typical, and is used |
125 | * for /proc and /sys data. This directly impacts e.g. top performance | |
126 | * with many processes running. We optimize it for speed | |
133fd9f5 DV |
127 | * using ideas described at <http://www.cs.uiowa.edu/~jones/bcd/divide.html> |
128 | * (with permission from the author, Douglas W. Jones). | |
129 | */ | |
4277eedd | 130 | |
133fd9f5 DV |
131 | #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64 |
132 | /* Formats correctly any integer in [0, 999999999] */ | |
cf3b429b | 133 | static noinline_for_stack |
133fd9f5 | 134 | char *put_dec_full9(char *buf, unsigned q) |
4277eedd | 135 | { |
133fd9f5 | 136 | unsigned r; |
7b9186f5 | 137 | |
133fd9f5 DV |
138 | /* |
139 | * Possible ways to approx. divide by 10 | |
140 | * (x * 0x1999999a) >> 32 x < 1073741829 (multiply must be 64-bit) | |
141 | * (x * 0xcccd) >> 19 x < 81920 (x < 262149 when 64-bit mul) | |
142 | * (x * 0x6667) >> 18 x < 43699 | |
143 | * (x * 0x3334) >> 17 x < 16389 | |
144 | * (x * 0x199a) >> 16 x < 16389 | |
145 | * (x * 0x0ccd) >> 15 x < 16389 | |
146 | * (x * 0x0667) >> 14 x < 2739 | |
147 | * (x * 0x0334) >> 13 x < 1029 | |
148 | * (x * 0x019a) >> 12 x < 1029 | |
149 | * (x * 0x00cd) >> 11 x < 1029 shorter code than * 0x67 (on i386) | |
150 | * (x * 0x0067) >> 10 x < 179 | |
151 | * (x * 0x0034) >> 9 x < 69 same | |
152 | * (x * 0x001a) >> 8 x < 69 same | |
153 | * (x * 0x000d) >> 7 x < 69 same, shortest code (on i386) | |
154 | * (x * 0x0007) >> 6 x < 19 | |
155 | * See <http://www.cs.uiowa.edu/~jones/bcd/divide.html> | |
156 | */ | |
157 | r = (q * (uint64_t)0x1999999a) >> 32; | |
158 | *buf++ = (q - 10 * r) + '0'; /* 1 */ | |
159 | q = (r * (uint64_t)0x1999999a) >> 32; | |
160 | *buf++ = (r - 10 * q) + '0'; /* 2 */ | |
161 | r = (q * (uint64_t)0x1999999a) >> 32; | |
162 | *buf++ = (q - 10 * r) + '0'; /* 3 */ | |
163 | q = (r * (uint64_t)0x1999999a) >> 32; | |
164 | *buf++ = (r - 10 * q) + '0'; /* 4 */ | |
165 | r = (q * (uint64_t)0x1999999a) >> 32; | |
166 | *buf++ = (q - 10 * r) + '0'; /* 5 */ | |
167 | /* Now value is under 10000, can avoid 64-bit multiply */ | |
168 | q = (r * 0x199a) >> 16; | |
169 | *buf++ = (r - 10 * q) + '0'; /* 6 */ | |
170 | r = (q * 0xcd) >> 11; | |
171 | *buf++ = (q - 10 * r) + '0'; /* 7 */ | |
172 | q = (r * 0xcd) >> 11; | |
173 | *buf++ = (r - 10 * q) + '0'; /* 8 */ | |
174 | *buf++ = q + '0'; /* 9 */ | |
4277eedd DV |
175 | return buf; |
176 | } | |
133fd9f5 DV |
177 | #endif |
178 | ||
179 | /* Similar to above but do not pad with zeros. | |
180 | * Code can be easily arranged to print 9 digits too, but our callers | |
181 | * always call put_dec_full9() instead when the number has 9 decimal digits. | |
182 | */ | |
cf3b429b | 183 | static noinline_for_stack |
133fd9f5 | 184 | char *put_dec_trunc8(char *buf, unsigned r) |
4277eedd | 185 | { |
133fd9f5 DV |
186 | unsigned q; |
187 | ||
188 | /* Copy of previous function's body with added early returns */ | |
cb239d0a GS |
189 | while (r >= 10000) { |
190 | q = r + '0'; | |
191 | r = (r * (uint64_t)0x1999999a) >> 32; | |
192 | *buf++ = q - 10*r; | |
193 | } | |
194 | ||
f4000516 GS |
195 | q = (r * 0x199a) >> 16; /* r <= 9999 */ |
196 | *buf++ = (r - 10 * q) + '0'; | |
133fd9f5 DV |
197 | if (q == 0) |
198 | return buf; | |
f4000516 GS |
199 | r = (q * 0xcd) >> 11; /* q <= 999 */ |
200 | *buf++ = (q - 10 * r) + '0'; | |
133fd9f5 DV |
201 | if (r == 0) |
202 | return buf; | |
f4000516 GS |
203 | q = (r * 0xcd) >> 11; /* r <= 99 */ |
204 | *buf++ = (r - 10 * q) + '0'; | |
133fd9f5 DV |
205 | if (q == 0) |
206 | return buf; | |
f4000516 | 207 | *buf++ = q + '0'; /* q <= 9 */ |
133fd9f5 DV |
208 | return buf; |
209 | } | |
4277eedd | 210 | |
133fd9f5 DV |
211 | /* There are two algorithms to print larger numbers. |
212 | * One is generic: divide by 1000000000 and repeatedly print | |
213 | * groups of (up to) 9 digits. It's conceptually simple, | |
214 | * but requires a (unsigned long long) / 1000000000 division. | |
215 | * | |
216 | * Second algorithm splits 64-bit unsigned long long into 16-bit chunks, | |
217 | * manipulates them cleverly and generates groups of 4 decimal digits. | |
218 | * It so happens that it does NOT require long long division. | |
219 | * | |
220 | * If long is > 32 bits, division of 64-bit values is relatively easy, | |
221 | * and we will use the first algorithm. | |
222 | * If long long is > 64 bits (strange architecture with VERY large long long), | |
223 | * second algorithm can't be used, and we again use the first one. | |
224 | * | |
225 | * Else (if long is 32 bits and long long is 64 bits) we use second one. | |
226 | */ | |
7b9186f5 | 227 | |
133fd9f5 DV |
228 | #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64 |
229 | ||
230 | /* First algorithm: generic */ | |
231 | ||
232 | static | |
233 | char *put_dec(char *buf, unsigned long long n) | |
234 | { | |
235 | if (n >= 100*1000*1000) { | |
236 | while (n >= 1000*1000*1000) | |
237 | buf = put_dec_full9(buf, do_div(n, 1000*1000*1000)); | |
238 | if (n >= 100*1000*1000) | |
239 | return put_dec_full9(buf, n); | |
240 | } | |
241 | return put_dec_trunc8(buf, n); | |
4277eedd | 242 | } |
133fd9f5 DV |
243 | |
244 | #else | |
245 | ||
246 | /* Second algorithm: valid only for 64-bit long longs */ | |
247 | ||
e49317d4 | 248 | /* See comment in put_dec_full9 for choice of constants */ |
cf3b429b | 249 | static noinline_for_stack |
2359172a | 250 | void put_dec_full4(char *buf, unsigned q) |
4277eedd | 251 | { |
133fd9f5 | 252 | unsigned r; |
e49317d4 | 253 | r = (q * 0xccd) >> 15; |
2359172a | 254 | buf[0] = (q - 10 * r) + '0'; |
e49317d4 | 255 | q = (r * 0xcd) >> 11; |
2359172a | 256 | buf[1] = (r - 10 * q) + '0'; |
133fd9f5 | 257 | r = (q * 0xcd) >> 11; |
2359172a GS |
258 | buf[2] = (q - 10 * r) + '0'; |
259 | buf[3] = r + '0'; | |
260 | } | |
261 | ||
262 | /* | |
263 | * Call put_dec_full4 on x % 10000, return x / 10000. | |
264 | * The approximation x/10000 == (x * 0x346DC5D7) >> 43 | |
265 | * holds for all x < 1,128,869,999. The largest value this | |
266 | * helper will ever be asked to convert is 1,125,520,955. | |
267 | * (d1 in the put_dec code, assuming n is all-ones). | |
268 | */ | |
269 | static | |
270 | unsigned put_dec_helper4(char *buf, unsigned x) | |
271 | { | |
272 | uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43; | |
273 | ||
274 | put_dec_full4(buf, x - q * 10000); | |
275 | return q; | |
4277eedd DV |
276 | } |
277 | ||
133fd9f5 DV |
278 | /* Based on code by Douglas W. Jones found at |
279 | * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour> | |
280 | * (with permission from the author). | |
281 | * Performs no 64-bit division and hence should be fast on 32-bit machines. | |
282 | */ | |
283 | static | |
284 | char *put_dec(char *buf, unsigned long long n) | |
285 | { | |
286 | uint32_t d3, d2, d1, q, h; | |
287 | ||
288 | if (n < 100*1000*1000) | |
289 | return put_dec_trunc8(buf, n); | |
290 | ||
291 | d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */ | |
292 | h = (n >> 32); | |
293 | d2 = (h ) & 0xffff; | |
294 | d3 = (h >> 16); /* implicit "& 0xffff" */ | |
295 | ||
296 | q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff); | |
2359172a GS |
297 | q = put_dec_helper4(buf, q); |
298 | ||
299 | q += 7671 * d3 + 9496 * d2 + 6 * d1; | |
300 | q = put_dec_helper4(buf+4, q); | |
301 | ||
302 | q += 4749 * d3 + 42 * d2; | |
303 | q = put_dec_helper4(buf+8, q); | |
133fd9f5 | 304 | |
2359172a GS |
305 | q += 281 * d3; |
306 | buf += 12; | |
307 | if (q) | |
308 | buf = put_dec_trunc8(buf, q); | |
309 | else while (buf[-1] == '0') | |
133fd9f5 DV |
310 | --buf; |
311 | ||
312 | return buf; | |
313 | } | |
314 | ||
315 | #endif | |
316 | ||
1ac101a5 KH |
317 | /* |
318 | * Convert passed number to decimal string. | |
319 | * Returns the length of string. On buffer overflow, returns 0. | |
320 | * | |
321 | * If speed is not important, use snprintf(). It's easy to read the code. | |
322 | */ | |
323 | int num_to_str(char *buf, int size, unsigned long long num) | |
324 | { | |
133fd9f5 | 325 | char tmp[sizeof(num) * 3]; |
1ac101a5 KH |
326 | int idx, len; |
327 | ||
133fd9f5 DV |
328 | /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */ |
329 | if (num <= 9) { | |
330 | tmp[0] = '0' + num; | |
331 | len = 1; | |
332 | } else { | |
333 | len = put_dec(tmp, num) - tmp; | |
334 | } | |
1ac101a5 KH |
335 | |
336 | if (len > size) | |
337 | return 0; | |
338 | for (idx = 0; idx < len; ++idx) | |
339 | buf[idx] = tmp[len - idx - 1]; | |
133fd9f5 | 340 | return len; |
1ac101a5 KH |
341 | } |
342 | ||
51be17df RV |
343 | #define SIGN 1 /* unsigned/signed, must be 1 */ |
344 | #define ZEROPAD 2 /* pad with zero */ | |
1da177e4 LT |
345 | #define PLUS 4 /* show plus */ |
346 | #define SPACE 8 /* space if plus */ | |
347 | #define LEFT 16 /* left justified */ | |
b89dc5d6 BH |
348 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ |
349 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ | |
1da177e4 | 350 | |
fef20d9c FW |
351 | enum format_type { |
352 | FORMAT_TYPE_NONE, /* Just a string part */ | |
ed681a91 | 353 | FORMAT_TYPE_WIDTH, |
fef20d9c FW |
354 | FORMAT_TYPE_PRECISION, |
355 | FORMAT_TYPE_CHAR, | |
356 | FORMAT_TYPE_STR, | |
357 | FORMAT_TYPE_PTR, | |
358 | FORMAT_TYPE_PERCENT_CHAR, | |
359 | FORMAT_TYPE_INVALID, | |
360 | FORMAT_TYPE_LONG_LONG, | |
361 | FORMAT_TYPE_ULONG, | |
362 | FORMAT_TYPE_LONG, | |
a4e94ef0 Z |
363 | FORMAT_TYPE_UBYTE, |
364 | FORMAT_TYPE_BYTE, | |
fef20d9c FW |
365 | FORMAT_TYPE_USHORT, |
366 | FORMAT_TYPE_SHORT, | |
367 | FORMAT_TYPE_UINT, | |
368 | FORMAT_TYPE_INT, | |
fef20d9c FW |
369 | FORMAT_TYPE_SIZE_T, |
370 | FORMAT_TYPE_PTRDIFF | |
371 | }; | |
372 | ||
373 | struct printf_spec { | |
4e310fda | 374 | u8 type; /* format_type enum */ |
ef0658f3 | 375 | u8 flags; /* flags to number() */ |
4e310fda JP |
376 | u8 base; /* number base, 8, 10 or 16 only */ |
377 | u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */ | |
378 | s16 field_width; /* width of output field */ | |
379 | s16 precision; /* # of digits/chars */ | |
fef20d9c FW |
380 | }; |
381 | ||
cf3b429b JP |
382 | static noinline_for_stack |
383 | char *number(char *buf, char *end, unsigned long long num, | |
384 | struct printf_spec spec) | |
1da177e4 | 385 | { |
e26c12c7 | 386 | char tmp[3 * sizeof(num)]; |
9b706aee DV |
387 | char sign; |
388 | char locase; | |
fef20d9c | 389 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
1da177e4 | 390 | int i; |
7c203422 | 391 | bool is_zero = num == 0LL; |
1da177e4 | 392 | |
9b706aee DV |
393 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
394 | * produces same digits or (maybe lowercased) letters */ | |
fef20d9c FW |
395 | locase = (spec.flags & SMALL); |
396 | if (spec.flags & LEFT) | |
397 | spec.flags &= ~ZEROPAD; | |
1da177e4 | 398 | sign = 0; |
fef20d9c | 399 | if (spec.flags & SIGN) { |
7b9186f5 | 400 | if ((signed long long)num < 0) { |
1da177e4 | 401 | sign = '-'; |
7b9186f5 | 402 | num = -(signed long long)num; |
fef20d9c FW |
403 | spec.field_width--; |
404 | } else if (spec.flags & PLUS) { | |
1da177e4 | 405 | sign = '+'; |
fef20d9c FW |
406 | spec.field_width--; |
407 | } else if (spec.flags & SPACE) { | |
1da177e4 | 408 | sign = ' '; |
fef20d9c | 409 | spec.field_width--; |
1da177e4 LT |
410 | } |
411 | } | |
b39a7340 | 412 | if (need_pfx) { |
fef20d9c | 413 | if (spec.base == 16) |
7c203422 PC |
414 | spec.field_width -= 2; |
415 | else if (!is_zero) | |
fef20d9c | 416 | spec.field_width--; |
1da177e4 | 417 | } |
b39a7340 DV |
418 | |
419 | /* generate full string in tmp[], in reverse order */ | |
1da177e4 | 420 | i = 0; |
133fd9f5 | 421 | if (num < spec.base) |
3ea8d440 | 422 | tmp[i++] = hex_asc_upper[num] | locase; |
fef20d9c FW |
423 | else if (spec.base != 10) { /* 8 or 16 */ |
424 | int mask = spec.base - 1; | |
b39a7340 | 425 | int shift = 3; |
7b9186f5 AGR |
426 | |
427 | if (spec.base == 16) | |
428 | shift = 4; | |
b39a7340 | 429 | do { |
3ea8d440 | 430 | tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase); |
b39a7340 DV |
431 | num >>= shift; |
432 | } while (num); | |
4277eedd DV |
433 | } else { /* base 10 */ |
434 | i = put_dec(tmp, num) - tmp; | |
435 | } | |
b39a7340 DV |
436 | |
437 | /* printing 100 using %2d gives "100", not "00" */ | |
fef20d9c FW |
438 | if (i > spec.precision) |
439 | spec.precision = i; | |
b39a7340 | 440 | /* leading space padding */ |
fef20d9c | 441 | spec.field_width -= spec.precision; |
51be17df | 442 | if (!(spec.flags & (ZEROPAD | LEFT))) { |
7b9186f5 | 443 | while (--spec.field_width >= 0) { |
f796937a | 444 | if (buf < end) |
1da177e4 LT |
445 | *buf = ' '; |
446 | ++buf; | |
447 | } | |
448 | } | |
b39a7340 | 449 | /* sign */ |
1da177e4 | 450 | if (sign) { |
f796937a | 451 | if (buf < end) |
1da177e4 LT |
452 | *buf = sign; |
453 | ++buf; | |
454 | } | |
b39a7340 DV |
455 | /* "0x" / "0" prefix */ |
456 | if (need_pfx) { | |
7c203422 PC |
457 | if (spec.base == 16 || !is_zero) { |
458 | if (buf < end) | |
459 | *buf = '0'; | |
460 | ++buf; | |
461 | } | |
fef20d9c | 462 | if (spec.base == 16) { |
f796937a | 463 | if (buf < end) |
9b706aee | 464 | *buf = ('X' | locase); |
1da177e4 LT |
465 | ++buf; |
466 | } | |
467 | } | |
b39a7340 | 468 | /* zero or space padding */ |
fef20d9c FW |
469 | if (!(spec.flags & LEFT)) { |
470 | char c = (spec.flags & ZEROPAD) ? '0' : ' '; | |
471 | while (--spec.field_width >= 0) { | |
f796937a | 472 | if (buf < end) |
1da177e4 LT |
473 | *buf = c; |
474 | ++buf; | |
475 | } | |
476 | } | |
b39a7340 | 477 | /* hmm even more zero padding? */ |
fef20d9c | 478 | while (i <= --spec.precision) { |
f796937a | 479 | if (buf < end) |
1da177e4 LT |
480 | *buf = '0'; |
481 | ++buf; | |
482 | } | |
b39a7340 DV |
483 | /* actual digits of result */ |
484 | while (--i >= 0) { | |
f796937a | 485 | if (buf < end) |
1da177e4 LT |
486 | *buf = tmp[i]; |
487 | ++buf; | |
488 | } | |
b39a7340 | 489 | /* trailing space padding */ |
fef20d9c | 490 | while (--spec.field_width >= 0) { |
f796937a | 491 | if (buf < end) |
1da177e4 LT |
492 | *buf = ' '; |
493 | ++buf; | |
494 | } | |
7b9186f5 | 495 | |
1da177e4 LT |
496 | return buf; |
497 | } | |
498 | ||
cf3b429b JP |
499 | static noinline_for_stack |
500 | char *string(char *buf, char *end, const char *s, struct printf_spec spec) | |
0f9bfa56 LT |
501 | { |
502 | int len, i; | |
503 | ||
504 | if ((unsigned long)s < PAGE_SIZE) | |
0f4f81dc | 505 | s = "(null)"; |
0f9bfa56 | 506 | |
fef20d9c | 507 | len = strnlen(s, spec.precision); |
0f9bfa56 | 508 | |
fef20d9c FW |
509 | if (!(spec.flags & LEFT)) { |
510 | while (len < spec.field_width--) { | |
0f9bfa56 LT |
511 | if (buf < end) |
512 | *buf = ' '; | |
513 | ++buf; | |
514 | } | |
515 | } | |
516 | for (i = 0; i < len; ++i) { | |
517 | if (buf < end) | |
518 | *buf = *s; | |
519 | ++buf; ++s; | |
520 | } | |
fef20d9c | 521 | while (len < spec.field_width--) { |
0f9bfa56 LT |
522 | if (buf < end) |
523 | *buf = ' '; | |
524 | ++buf; | |
525 | } | |
7b9186f5 | 526 | |
0f9bfa56 LT |
527 | return buf; |
528 | } | |
529 | ||
4b6ccca7 AV |
530 | static void widen(char *buf, char *end, unsigned len, unsigned spaces) |
531 | { | |
532 | size_t size; | |
533 | if (buf >= end) /* nowhere to put anything */ | |
534 | return; | |
535 | size = end - buf; | |
536 | if (size <= spaces) { | |
537 | memset(buf, ' ', size); | |
538 | return; | |
539 | } | |
540 | if (len) { | |
541 | if (len > size - spaces) | |
542 | len = size - spaces; | |
543 | memmove(buf + spaces, buf, len); | |
544 | } | |
545 | memset(buf, ' ', spaces); | |
546 | } | |
547 | ||
548 | static noinline_for_stack | |
549 | char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec, | |
550 | const char *fmt) | |
551 | { | |
552 | const char *array[4], *s; | |
553 | const struct dentry *p; | |
554 | int depth; | |
555 | int i, n; | |
556 | ||
557 | switch (fmt[1]) { | |
558 | case '2': case '3': case '4': | |
559 | depth = fmt[1] - '0'; | |
560 | break; | |
561 | default: | |
562 | depth = 1; | |
563 | } | |
564 | ||
565 | rcu_read_lock(); | |
566 | for (i = 0; i < depth; i++, d = p) { | |
567 | p = ACCESS_ONCE(d->d_parent); | |
568 | array[i] = ACCESS_ONCE(d->d_name.name); | |
569 | if (p == d) { | |
570 | if (i) | |
571 | array[i] = ""; | |
572 | i++; | |
573 | break; | |
574 | } | |
575 | } | |
576 | s = array[--i]; | |
577 | for (n = 0; n != spec.precision; n++, buf++) { | |
578 | char c = *s++; | |
579 | if (!c) { | |
580 | if (!i) | |
581 | break; | |
582 | c = '/'; | |
583 | s = array[--i]; | |
584 | } | |
585 | if (buf < end) | |
586 | *buf = c; | |
587 | } | |
588 | rcu_read_unlock(); | |
589 | if (n < spec.field_width) { | |
590 | /* we want to pad the sucker */ | |
591 | unsigned spaces = spec.field_width - n; | |
592 | if (!(spec.flags & LEFT)) { | |
593 | widen(buf - n, end, n, spaces); | |
594 | return buf + spaces; | |
595 | } | |
596 | while (spaces--) { | |
597 | if (buf < end) | |
598 | *buf = ' '; | |
599 | ++buf; | |
600 | } | |
601 | } | |
602 | return buf; | |
603 | } | |
604 | ||
cf3b429b JP |
605 | static noinline_for_stack |
606 | char *symbol_string(char *buf, char *end, void *ptr, | |
b0d33c2b | 607 | struct printf_spec spec, const char *fmt) |
0fe1ef24 | 608 | { |
b0d33c2b | 609 | unsigned long value; |
0fe1ef24 LT |
610 | #ifdef CONFIG_KALLSYMS |
611 | char sym[KSYM_SYMBOL_LEN]; | |
b0d33c2b JP |
612 | #endif |
613 | ||
614 | if (fmt[1] == 'R') | |
615 | ptr = __builtin_extract_return_addr(ptr); | |
616 | value = (unsigned long)ptr; | |
617 | ||
618 | #ifdef CONFIG_KALLSYMS | |
619 | if (*fmt == 'B') | |
0f77a8d3 | 620 | sprint_backtrace(sym, value); |
b0d33c2b | 621 | else if (*fmt != 'f' && *fmt != 's') |
0c8b946e FW |
622 | sprint_symbol(sym, value); |
623 | else | |
4796dd20 | 624 | sprint_symbol_no_offset(sym, value); |
7b9186f5 | 625 | |
fef20d9c | 626 | return string(buf, end, sym, spec); |
0fe1ef24 | 627 | #else |
7b9186f5 | 628 | spec.field_width = 2 * sizeof(void *); |
fef20d9c FW |
629 | spec.flags |= SPECIAL | SMALL | ZEROPAD; |
630 | spec.base = 16; | |
7b9186f5 | 631 | |
fef20d9c | 632 | return number(buf, end, value, spec); |
0fe1ef24 LT |
633 | #endif |
634 | } | |
635 | ||
cf3b429b JP |
636 | static noinline_for_stack |
637 | char *resource_string(char *buf, char *end, struct resource *res, | |
638 | struct printf_spec spec, const char *fmt) | |
332d2e78 LT |
639 | { |
640 | #ifndef IO_RSRC_PRINTK_SIZE | |
28405372 | 641 | #define IO_RSRC_PRINTK_SIZE 6 |
332d2e78 LT |
642 | #endif |
643 | ||
644 | #ifndef MEM_RSRC_PRINTK_SIZE | |
28405372 | 645 | #define MEM_RSRC_PRINTK_SIZE 10 |
332d2e78 | 646 | #endif |
4da0b66c | 647 | static const struct printf_spec io_spec = { |
fef20d9c | 648 | .base = 16, |
4da0b66c | 649 | .field_width = IO_RSRC_PRINTK_SIZE, |
fef20d9c FW |
650 | .precision = -1, |
651 | .flags = SPECIAL | SMALL | ZEROPAD, | |
652 | }; | |
4da0b66c BH |
653 | static const struct printf_spec mem_spec = { |
654 | .base = 16, | |
655 | .field_width = MEM_RSRC_PRINTK_SIZE, | |
656 | .precision = -1, | |
657 | .flags = SPECIAL | SMALL | ZEROPAD, | |
658 | }; | |
0f4050c7 BH |
659 | static const struct printf_spec bus_spec = { |
660 | .base = 16, | |
661 | .field_width = 2, | |
662 | .precision = -1, | |
663 | .flags = SMALL | ZEROPAD, | |
664 | }; | |
4da0b66c | 665 | static const struct printf_spec dec_spec = { |
c91d3376 BH |
666 | .base = 10, |
667 | .precision = -1, | |
668 | .flags = 0, | |
669 | }; | |
4da0b66c | 670 | static const struct printf_spec str_spec = { |
fd95541e BH |
671 | .field_width = -1, |
672 | .precision = 10, | |
673 | .flags = LEFT, | |
674 | }; | |
4da0b66c | 675 | static const struct printf_spec flag_spec = { |
fd95541e BH |
676 | .base = 16, |
677 | .precision = -1, | |
678 | .flags = SPECIAL | SMALL, | |
679 | }; | |
c7dabef8 BH |
680 | |
681 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) | |
682 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ | |
683 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) | |
684 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) | |
9d7cca04 | 685 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") |
c7dabef8 BH |
686 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") |
687 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, | |
688 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; | |
689 | ||
332d2e78 | 690 | char *p = sym, *pend = sym + sizeof(sym); |
c7dabef8 | 691 | int decode = (fmt[0] == 'R') ? 1 : 0; |
4da0b66c | 692 | const struct printf_spec *specp; |
332d2e78 LT |
693 | |
694 | *p++ = '['; | |
4da0b66c | 695 | if (res->flags & IORESOURCE_IO) { |
c7dabef8 | 696 | p = string(p, pend, "io ", str_spec); |
4da0b66c BH |
697 | specp = &io_spec; |
698 | } else if (res->flags & IORESOURCE_MEM) { | |
c7dabef8 | 699 | p = string(p, pend, "mem ", str_spec); |
4da0b66c BH |
700 | specp = &mem_spec; |
701 | } else if (res->flags & IORESOURCE_IRQ) { | |
c7dabef8 | 702 | p = string(p, pend, "irq ", str_spec); |
4da0b66c BH |
703 | specp = &dec_spec; |
704 | } else if (res->flags & IORESOURCE_DMA) { | |
c7dabef8 | 705 | p = string(p, pend, "dma ", str_spec); |
4da0b66c | 706 | specp = &dec_spec; |
0f4050c7 BH |
707 | } else if (res->flags & IORESOURCE_BUS) { |
708 | p = string(p, pend, "bus ", str_spec); | |
709 | specp = &bus_spec; | |
4da0b66c | 710 | } else { |
c7dabef8 | 711 | p = string(p, pend, "??? ", str_spec); |
4da0b66c | 712 | specp = &mem_spec; |
c7dabef8 | 713 | decode = 0; |
fd95541e | 714 | } |
d19cb803 BH |
715 | if (decode && res->flags & IORESOURCE_UNSET) { |
716 | p = string(p, pend, "size ", str_spec); | |
717 | p = number(p, pend, resource_size(res), *specp); | |
718 | } else { | |
719 | p = number(p, pend, res->start, *specp); | |
720 | if (res->start != res->end) { | |
721 | *p++ = '-'; | |
722 | p = number(p, pend, res->end, *specp); | |
723 | } | |
c91d3376 | 724 | } |
c7dabef8 | 725 | if (decode) { |
fd95541e BH |
726 | if (res->flags & IORESOURCE_MEM_64) |
727 | p = string(p, pend, " 64bit", str_spec); | |
728 | if (res->flags & IORESOURCE_PREFETCH) | |
729 | p = string(p, pend, " pref", str_spec); | |
9d7cca04 BH |
730 | if (res->flags & IORESOURCE_WINDOW) |
731 | p = string(p, pend, " window", str_spec); | |
fd95541e BH |
732 | if (res->flags & IORESOURCE_DISABLED) |
733 | p = string(p, pend, " disabled", str_spec); | |
c7dabef8 BH |
734 | } else { |
735 | p = string(p, pend, " flags ", str_spec); | |
736 | p = number(p, pend, res->flags, flag_spec); | |
fd95541e | 737 | } |
332d2e78 | 738 | *p++ = ']'; |
c7dabef8 | 739 | *p = '\0'; |
332d2e78 | 740 | |
fef20d9c | 741 | return string(buf, end, sym, spec); |
332d2e78 LT |
742 | } |
743 | ||
31550a16 AS |
744 | static noinline_for_stack |
745 | char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
746 | const char *fmt) | |
747 | { | |
360603a1 | 748 | int i, len = 1; /* if we pass '%ph[CDN]', field width remains |
31550a16 AS |
749 | negative value, fallback to the default */ |
750 | char separator; | |
751 | ||
752 | if (spec.field_width == 0) | |
753 | /* nothing to print */ | |
754 | return buf; | |
755 | ||
756 | if (ZERO_OR_NULL_PTR(addr)) | |
757 | /* NULL pointer */ | |
758 | return string(buf, end, NULL, spec); | |
759 | ||
760 | switch (fmt[1]) { | |
761 | case 'C': | |
762 | separator = ':'; | |
763 | break; | |
764 | case 'D': | |
765 | separator = '-'; | |
766 | break; | |
767 | case 'N': | |
768 | separator = 0; | |
769 | break; | |
770 | default: | |
771 | separator = ' '; | |
772 | break; | |
773 | } | |
774 | ||
775 | if (spec.field_width > 0) | |
776 | len = min_t(int, spec.field_width, 64); | |
777 | ||
778 | for (i = 0; i < len && buf < end - 1; i++) { | |
779 | buf = hex_byte_pack(buf, addr[i]); | |
780 | ||
781 | if (buf < end && separator && i != len - 1) | |
782 | *buf++ = separator; | |
783 | } | |
784 | ||
785 | return buf; | |
786 | } | |
787 | ||
dbc760bc TH |
788 | static noinline_for_stack |
789 | char *bitmap_string(char *buf, char *end, unsigned long *bitmap, | |
790 | struct printf_spec spec, const char *fmt) | |
791 | { | |
792 | const int CHUNKSZ = 32; | |
793 | int nr_bits = max_t(int, spec.field_width, 0); | |
794 | int i, chunksz; | |
795 | bool first = true; | |
796 | ||
797 | /* reused to print numbers */ | |
798 | spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 }; | |
799 | ||
800 | chunksz = nr_bits & (CHUNKSZ - 1); | |
801 | if (chunksz == 0) | |
802 | chunksz = CHUNKSZ; | |
803 | ||
804 | i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ; | |
805 | for (; i >= 0; i -= CHUNKSZ) { | |
806 | u32 chunkmask, val; | |
807 | int word, bit; | |
808 | ||
809 | chunkmask = ((1ULL << chunksz) - 1); | |
810 | word = i / BITS_PER_LONG; | |
811 | bit = i % BITS_PER_LONG; | |
812 | val = (bitmap[word] >> bit) & chunkmask; | |
813 | ||
814 | if (!first) { | |
815 | if (buf < end) | |
816 | *buf = ','; | |
817 | buf++; | |
818 | } | |
819 | first = false; | |
820 | ||
821 | spec.field_width = DIV_ROUND_UP(chunksz, 4); | |
822 | buf = number(buf, end, val, spec); | |
823 | ||
824 | chunksz = CHUNKSZ; | |
825 | } | |
826 | return buf; | |
827 | } | |
828 | ||
829 | static noinline_for_stack | |
830 | char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap, | |
831 | struct printf_spec spec, const char *fmt) | |
832 | { | |
833 | int nr_bits = max_t(int, spec.field_width, 0); | |
834 | /* current bit is 'cur', most recently seen range is [rbot, rtop] */ | |
835 | int cur, rbot, rtop; | |
836 | bool first = true; | |
837 | ||
838 | /* reused to print numbers */ | |
839 | spec = (struct printf_spec){ .base = 10 }; | |
840 | ||
841 | rbot = cur = find_first_bit(bitmap, nr_bits); | |
842 | while (cur < nr_bits) { | |
843 | rtop = cur; | |
844 | cur = find_next_bit(bitmap, nr_bits, cur + 1); | |
845 | if (cur < nr_bits && cur <= rtop + 1) | |
846 | continue; | |
847 | ||
848 | if (!first) { | |
849 | if (buf < end) | |
850 | *buf = ','; | |
851 | buf++; | |
852 | } | |
853 | first = false; | |
854 | ||
855 | buf = number(buf, end, rbot, spec); | |
856 | if (rbot < rtop) { | |
857 | if (buf < end) | |
858 | *buf = '-'; | |
859 | buf++; | |
860 | ||
861 | buf = number(buf, end, rtop, spec); | |
862 | } | |
863 | ||
864 | rbot = cur; | |
865 | } | |
866 | return buf; | |
867 | } | |
868 | ||
cf3b429b JP |
869 | static noinline_for_stack |
870 | char *mac_address_string(char *buf, char *end, u8 *addr, | |
871 | struct printf_spec spec, const char *fmt) | |
dd45c9cf | 872 | { |
8a27f7c9 | 873 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; |
dd45c9cf HH |
874 | char *p = mac_addr; |
875 | int i; | |
bc7259a2 | 876 | char separator; |
76597ff9 | 877 | bool reversed = false; |
bc7259a2 | 878 | |
76597ff9 AE |
879 | switch (fmt[1]) { |
880 | case 'F': | |
bc7259a2 | 881 | separator = '-'; |
76597ff9 AE |
882 | break; |
883 | ||
884 | case 'R': | |
885 | reversed = true; | |
886 | /* fall through */ | |
887 | ||
888 | default: | |
bc7259a2 | 889 | separator = ':'; |
76597ff9 | 890 | break; |
bc7259a2 | 891 | } |
dd45c9cf HH |
892 | |
893 | for (i = 0; i < 6; i++) { | |
76597ff9 AE |
894 | if (reversed) |
895 | p = hex_byte_pack(p, addr[5 - i]); | |
896 | else | |
897 | p = hex_byte_pack(p, addr[i]); | |
898 | ||
8a27f7c9 | 899 | if (fmt[0] == 'M' && i != 5) |
bc7259a2 | 900 | *p++ = separator; |
dd45c9cf HH |
901 | } |
902 | *p = '\0'; | |
903 | ||
fef20d9c | 904 | return string(buf, end, mac_addr, spec); |
dd45c9cf HH |
905 | } |
906 | ||
cf3b429b JP |
907 | static noinline_for_stack |
908 | char *ip4_string(char *p, const u8 *addr, const char *fmt) | |
8a27f7c9 JP |
909 | { |
910 | int i; | |
0159f24e JP |
911 | bool leading_zeros = (fmt[0] == 'i'); |
912 | int index; | |
913 | int step; | |
914 | ||
915 | switch (fmt[2]) { | |
916 | case 'h': | |
917 | #ifdef __BIG_ENDIAN | |
918 | index = 0; | |
919 | step = 1; | |
920 | #else | |
921 | index = 3; | |
922 | step = -1; | |
923 | #endif | |
924 | break; | |
925 | case 'l': | |
926 | index = 3; | |
927 | step = -1; | |
928 | break; | |
929 | case 'n': | |
930 | case 'b': | |
931 | default: | |
932 | index = 0; | |
933 | step = 1; | |
934 | break; | |
935 | } | |
8a27f7c9 JP |
936 | for (i = 0; i < 4; i++) { |
937 | char temp[3]; /* hold each IP quad in reverse order */ | |
133fd9f5 | 938 | int digits = put_dec_trunc8(temp, addr[index]) - temp; |
8a27f7c9 JP |
939 | if (leading_zeros) { |
940 | if (digits < 3) | |
941 | *p++ = '0'; | |
942 | if (digits < 2) | |
943 | *p++ = '0'; | |
944 | } | |
945 | /* reverse the digits in the quad */ | |
946 | while (digits--) | |
947 | *p++ = temp[digits]; | |
948 | if (i < 3) | |
949 | *p++ = '.'; | |
0159f24e | 950 | index += step; |
8a27f7c9 | 951 | } |
8a27f7c9 | 952 | *p = '\0'; |
7b9186f5 | 953 | |
8a27f7c9 JP |
954 | return p; |
955 | } | |
956 | ||
cf3b429b JP |
957 | static noinline_for_stack |
958 | char *ip6_compressed_string(char *p, const char *addr) | |
689afa7d | 959 | { |
7b9186f5 | 960 | int i, j, range; |
8a27f7c9 JP |
961 | unsigned char zerolength[8]; |
962 | int longest = 1; | |
963 | int colonpos = -1; | |
964 | u16 word; | |
7b9186f5 | 965 | u8 hi, lo; |
8a27f7c9 | 966 | bool needcolon = false; |
eb78cd26 JP |
967 | bool useIPv4; |
968 | struct in6_addr in6; | |
969 | ||
970 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
971 | ||
972 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
8a27f7c9 JP |
973 | |
974 | memset(zerolength, 0, sizeof(zerolength)); | |
975 | ||
976 | if (useIPv4) | |
977 | range = 6; | |
978 | else | |
979 | range = 8; | |
980 | ||
981 | /* find position of longest 0 run */ | |
982 | for (i = 0; i < range; i++) { | |
983 | for (j = i; j < range; j++) { | |
eb78cd26 | 984 | if (in6.s6_addr16[j] != 0) |
8a27f7c9 JP |
985 | break; |
986 | zerolength[i]++; | |
987 | } | |
988 | } | |
989 | for (i = 0; i < range; i++) { | |
990 | if (zerolength[i] > longest) { | |
991 | longest = zerolength[i]; | |
992 | colonpos = i; | |
993 | } | |
994 | } | |
29cf519e JP |
995 | if (longest == 1) /* don't compress a single 0 */ |
996 | colonpos = -1; | |
689afa7d | 997 | |
8a27f7c9 JP |
998 | /* emit address */ |
999 | for (i = 0; i < range; i++) { | |
1000 | if (i == colonpos) { | |
1001 | if (needcolon || i == 0) | |
1002 | *p++ = ':'; | |
1003 | *p++ = ':'; | |
1004 | needcolon = false; | |
1005 | i += longest - 1; | |
1006 | continue; | |
1007 | } | |
1008 | if (needcolon) { | |
1009 | *p++ = ':'; | |
1010 | needcolon = false; | |
1011 | } | |
1012 | /* hex u16 without leading 0s */ | |
eb78cd26 | 1013 | word = ntohs(in6.s6_addr16[i]); |
8a27f7c9 JP |
1014 | hi = word >> 8; |
1015 | lo = word & 0xff; | |
1016 | if (hi) { | |
1017 | if (hi > 0x0f) | |
55036ba7 | 1018 | p = hex_byte_pack(p, hi); |
8a27f7c9 JP |
1019 | else |
1020 | *p++ = hex_asc_lo(hi); | |
55036ba7 | 1021 | p = hex_byte_pack(p, lo); |
8a27f7c9 | 1022 | } |
b5ff992b | 1023 | else if (lo > 0x0f) |
55036ba7 | 1024 | p = hex_byte_pack(p, lo); |
8a27f7c9 JP |
1025 | else |
1026 | *p++ = hex_asc_lo(lo); | |
1027 | needcolon = true; | |
1028 | } | |
1029 | ||
1030 | if (useIPv4) { | |
1031 | if (needcolon) | |
1032 | *p++ = ':'; | |
0159f24e | 1033 | p = ip4_string(p, &in6.s6_addr[12], "I4"); |
8a27f7c9 | 1034 | } |
8a27f7c9 | 1035 | *p = '\0'; |
7b9186f5 | 1036 | |
8a27f7c9 JP |
1037 | return p; |
1038 | } | |
1039 | ||
cf3b429b JP |
1040 | static noinline_for_stack |
1041 | char *ip6_string(char *p, const char *addr, const char *fmt) | |
8a27f7c9 JP |
1042 | { |
1043 | int i; | |
7b9186f5 | 1044 | |
689afa7d | 1045 | for (i = 0; i < 8; i++) { |
55036ba7 AS |
1046 | p = hex_byte_pack(p, *addr++); |
1047 | p = hex_byte_pack(p, *addr++); | |
8a27f7c9 | 1048 | if (fmt[0] == 'I' && i != 7) |
689afa7d HH |
1049 | *p++ = ':'; |
1050 | } | |
1051 | *p = '\0'; | |
7b9186f5 | 1052 | |
8a27f7c9 JP |
1053 | return p; |
1054 | } | |
1055 | ||
cf3b429b JP |
1056 | static noinline_for_stack |
1057 | char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
1058 | struct printf_spec spec, const char *fmt) | |
8a27f7c9 JP |
1059 | { |
1060 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
1061 | ||
1062 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
eb78cd26 | 1063 | ip6_compressed_string(ip6_addr, addr); |
8a27f7c9 | 1064 | else |
eb78cd26 | 1065 | ip6_string(ip6_addr, addr, fmt); |
689afa7d | 1066 | |
fef20d9c | 1067 | return string(buf, end, ip6_addr, spec); |
689afa7d HH |
1068 | } |
1069 | ||
cf3b429b JP |
1070 | static noinline_for_stack |
1071 | char *ip4_addr_string(char *buf, char *end, const u8 *addr, | |
1072 | struct printf_spec spec, const char *fmt) | |
4aa99606 | 1073 | { |
8a27f7c9 | 1074 | char ip4_addr[sizeof("255.255.255.255")]; |
4aa99606 | 1075 | |
0159f24e | 1076 | ip4_string(ip4_addr, addr, fmt); |
4aa99606 | 1077 | |
fef20d9c | 1078 | return string(buf, end, ip4_addr, spec); |
4aa99606 HH |
1079 | } |
1080 | ||
10679643 DB |
1081 | static noinline_for_stack |
1082 | char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa, | |
1083 | struct printf_spec spec, const char *fmt) | |
1084 | { | |
1085 | bool have_p = false, have_s = false, have_f = false, have_c = false; | |
1086 | char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") + | |
1087 | sizeof(":12345") + sizeof("/123456789") + | |
1088 | sizeof("%1234567890")]; | |
1089 | char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr); | |
1090 | const u8 *addr = (const u8 *) &sa->sin6_addr; | |
1091 | char fmt6[2] = { fmt[0], '6' }; | |
1092 | u8 off = 0; | |
1093 | ||
1094 | fmt++; | |
1095 | while (isalpha(*++fmt)) { | |
1096 | switch (*fmt) { | |
1097 | case 'p': | |
1098 | have_p = true; | |
1099 | break; | |
1100 | case 'f': | |
1101 | have_f = true; | |
1102 | break; | |
1103 | case 's': | |
1104 | have_s = true; | |
1105 | break; | |
1106 | case 'c': | |
1107 | have_c = true; | |
1108 | break; | |
1109 | } | |
1110 | } | |
1111 | ||
1112 | if (have_p || have_s || have_f) { | |
1113 | *p = '['; | |
1114 | off = 1; | |
1115 | } | |
1116 | ||
1117 | if (fmt6[0] == 'I' && have_c) | |
1118 | p = ip6_compressed_string(ip6_addr + off, addr); | |
1119 | else | |
1120 | p = ip6_string(ip6_addr + off, addr, fmt6); | |
1121 | ||
1122 | if (have_p || have_s || have_f) | |
1123 | *p++ = ']'; | |
1124 | ||
1125 | if (have_p) { | |
1126 | *p++ = ':'; | |
1127 | p = number(p, pend, ntohs(sa->sin6_port), spec); | |
1128 | } | |
1129 | if (have_f) { | |
1130 | *p++ = '/'; | |
1131 | p = number(p, pend, ntohl(sa->sin6_flowinfo & | |
1132 | IPV6_FLOWINFO_MASK), spec); | |
1133 | } | |
1134 | if (have_s) { | |
1135 | *p++ = '%'; | |
1136 | p = number(p, pend, sa->sin6_scope_id, spec); | |
1137 | } | |
1138 | *p = '\0'; | |
1139 | ||
1140 | return string(buf, end, ip6_addr, spec); | |
1141 | } | |
1142 | ||
1143 | static noinline_for_stack | |
1144 | char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa, | |
1145 | struct printf_spec spec, const char *fmt) | |
1146 | { | |
1147 | bool have_p = false; | |
1148 | char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")]; | |
1149 | char *pend = ip4_addr + sizeof(ip4_addr); | |
1150 | const u8 *addr = (const u8 *) &sa->sin_addr.s_addr; | |
1151 | char fmt4[3] = { fmt[0], '4', 0 }; | |
1152 | ||
1153 | fmt++; | |
1154 | while (isalpha(*++fmt)) { | |
1155 | switch (*fmt) { | |
1156 | case 'p': | |
1157 | have_p = true; | |
1158 | break; | |
1159 | case 'h': | |
1160 | case 'l': | |
1161 | case 'n': | |
1162 | case 'b': | |
1163 | fmt4[2] = *fmt; | |
1164 | break; | |
1165 | } | |
1166 | } | |
1167 | ||
1168 | p = ip4_string(ip4_addr, addr, fmt4); | |
1169 | if (have_p) { | |
1170 | *p++ = ':'; | |
1171 | p = number(p, pend, ntohs(sa->sin_port), spec); | |
1172 | } | |
1173 | *p = '\0'; | |
1174 | ||
1175 | return string(buf, end, ip4_addr, spec); | |
1176 | } | |
1177 | ||
71dca95d AS |
1178 | static noinline_for_stack |
1179 | char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
1180 | const char *fmt) | |
1181 | { | |
1182 | bool found = true; | |
1183 | int count = 1; | |
1184 | unsigned int flags = 0; | |
1185 | int len; | |
1186 | ||
1187 | if (spec.field_width == 0) | |
1188 | return buf; /* nothing to print */ | |
1189 | ||
1190 | if (ZERO_OR_NULL_PTR(addr)) | |
1191 | return string(buf, end, NULL, spec); /* NULL pointer */ | |
1192 | ||
1193 | ||
1194 | do { | |
1195 | switch (fmt[count++]) { | |
1196 | case 'a': | |
1197 | flags |= ESCAPE_ANY; | |
1198 | break; | |
1199 | case 'c': | |
1200 | flags |= ESCAPE_SPECIAL; | |
1201 | break; | |
1202 | case 'h': | |
1203 | flags |= ESCAPE_HEX; | |
1204 | break; | |
1205 | case 'n': | |
1206 | flags |= ESCAPE_NULL; | |
1207 | break; | |
1208 | case 'o': | |
1209 | flags |= ESCAPE_OCTAL; | |
1210 | break; | |
1211 | case 'p': | |
1212 | flags |= ESCAPE_NP; | |
1213 | break; | |
1214 | case 's': | |
1215 | flags |= ESCAPE_SPACE; | |
1216 | break; | |
1217 | default: | |
1218 | found = false; | |
1219 | break; | |
1220 | } | |
1221 | } while (found); | |
1222 | ||
1223 | if (!flags) | |
1224 | flags = ESCAPE_ANY_NP; | |
1225 | ||
1226 | len = spec.field_width < 0 ? 1 : spec.field_width; | |
1227 | ||
1228 | /* Ignore the error. We print as many characters as we can */ | |
1229 | string_escape_mem(addr, len, &buf, end - buf, flags, NULL); | |
1230 | ||
1231 | return buf; | |
1232 | } | |
1233 | ||
cf3b429b JP |
1234 | static noinline_for_stack |
1235 | char *uuid_string(char *buf, char *end, const u8 *addr, | |
1236 | struct printf_spec spec, const char *fmt) | |
9ac6e44e JP |
1237 | { |
1238 | char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; | |
1239 | char *p = uuid; | |
1240 | int i; | |
1241 | static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; | |
1242 | static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; | |
1243 | const u8 *index = be; | |
1244 | bool uc = false; | |
1245 | ||
1246 | switch (*(++fmt)) { | |
1247 | case 'L': | |
1248 | uc = true; /* fall-through */ | |
1249 | case 'l': | |
1250 | index = le; | |
1251 | break; | |
1252 | case 'B': | |
1253 | uc = true; | |
1254 | break; | |
1255 | } | |
1256 | ||
1257 | for (i = 0; i < 16; i++) { | |
55036ba7 | 1258 | p = hex_byte_pack(p, addr[index[i]]); |
9ac6e44e JP |
1259 | switch (i) { |
1260 | case 3: | |
1261 | case 5: | |
1262 | case 7: | |
1263 | case 9: | |
1264 | *p++ = '-'; | |
1265 | break; | |
1266 | } | |
1267 | } | |
1268 | ||
1269 | *p = 0; | |
1270 | ||
1271 | if (uc) { | |
1272 | p = uuid; | |
1273 | do { | |
1274 | *p = toupper(*p); | |
1275 | } while (*(++p)); | |
1276 | } | |
1277 | ||
1278 | return string(buf, end, uuid, spec); | |
1279 | } | |
1280 | ||
c8f44aff MM |
1281 | static |
1282 | char *netdev_feature_string(char *buf, char *end, const u8 *addr, | |
1283 | struct printf_spec spec) | |
1284 | { | |
1285 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
1286 | if (spec.field_width == -1) | |
1287 | spec.field_width = 2 + 2 * sizeof(netdev_features_t); | |
1288 | spec.base = 16; | |
1289 | ||
1290 | return number(buf, end, *(const netdev_features_t *)addr, spec); | |
1291 | } | |
1292 | ||
aaf07621 JP |
1293 | static noinline_for_stack |
1294 | char *address_val(char *buf, char *end, const void *addr, | |
1295 | struct printf_spec spec, const char *fmt) | |
1296 | { | |
1297 | unsigned long long num; | |
1298 | ||
1299 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
1300 | spec.base = 16; | |
1301 | ||
1302 | switch (fmt[1]) { | |
1303 | case 'd': | |
1304 | num = *(const dma_addr_t *)addr; | |
1305 | spec.field_width = sizeof(dma_addr_t) * 2 + 2; | |
1306 | break; | |
1307 | case 'p': | |
1308 | default: | |
1309 | num = *(const phys_addr_t *)addr; | |
1310 | spec.field_width = sizeof(phys_addr_t) * 2 + 2; | |
1311 | break; | |
1312 | } | |
1313 | ||
1314 | return number(buf, end, num, spec); | |
1315 | } | |
1316 | ||
411f05f1 | 1317 | int kptr_restrict __read_mostly; |
455cd5ab | 1318 | |
4d8a743c LT |
1319 | /* |
1320 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
1321 | * by an extra set of alphanumeric characters that are extended format | |
1322 | * specifiers. | |
1323 | * | |
332d2e78 LT |
1324 | * Right now we handle: |
1325 | * | |
0c8b946e FW |
1326 | * - 'F' For symbolic function descriptor pointers with offset |
1327 | * - 'f' For simple symbolic function names without offset | |
0efb4d20 SR |
1328 | * - 'S' For symbolic direct pointers with offset |
1329 | * - 's' For symbolic direct pointers without offset | |
b0d33c2b | 1330 | * - '[FfSs]R' as above with __builtin_extract_return_addr() translation |
0f77a8d3 | 1331 | * - 'B' For backtraced symbolic direct pointers with offset |
c7dabef8 BH |
1332 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] |
1333 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] | |
dbc760bc TH |
1334 | * - 'b[l]' For a bitmap, the number of bits is determined by the field |
1335 | * width which must be explicitly specified either as part of the | |
1336 | * format string '%32b[l]' or through '%*b[l]', [l] selects | |
1337 | * range-list format instead of hex format | |
dd45c9cf HH |
1338 | * - 'M' For a 6-byte MAC address, it prints the address in the |
1339 | * usual colon-separated hex notation | |
8a27f7c9 | 1340 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons |
bc7259a2 | 1341 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address |
c8e00060 | 1342 | * with a dash-separated hex notation |
7c59154e | 1343 | * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth) |
8a27f7c9 JP |
1344 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way |
1345 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
1346 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
10679643 DB |
1347 | * [S][pfs] |
1348 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1349 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
8a27f7c9 JP |
1350 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses |
1351 | * IPv6 omits the colons (01020304...0f) | |
1352 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
10679643 DB |
1353 | * [S][pfs] |
1354 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1355 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
1356 | * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order | |
1357 | * - 'I[6S]c' for IPv6 addresses printed as specified by | |
29cf519e | 1358 | * http://tools.ietf.org/html/rfc5952 |
71dca95d AS |
1359 | * - 'E[achnops]' For an escaped buffer, where rules are defined by combination |
1360 | * of the following flags (see string_escape_mem() for the | |
1361 | * details): | |
1362 | * a - ESCAPE_ANY | |
1363 | * c - ESCAPE_SPECIAL | |
1364 | * h - ESCAPE_HEX | |
1365 | * n - ESCAPE_NULL | |
1366 | * o - ESCAPE_OCTAL | |
1367 | * p - ESCAPE_NP | |
1368 | * s - ESCAPE_SPACE | |
1369 | * By default ESCAPE_ANY_NP is used. | |
9ac6e44e JP |
1370 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form |
1371 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" | |
1372 | * Options for %pU are: | |
1373 | * b big endian lower case hex (default) | |
1374 | * B big endian UPPER case hex | |
1375 | * l little endian lower case hex | |
1376 | * L little endian UPPER case hex | |
1377 | * big endian output byte order is: | |
1378 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] | |
1379 | * little endian output byte order is: | |
1380 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] | |
7db6f5fb JP |
1381 | * - 'V' For a struct va_format which contains a format string * and va_list *, |
1382 | * call vsnprintf(->format, *->va_list). | |
1383 | * Implements a "recursive vsnprintf". | |
1384 | * Do not use this feature without some mechanism to verify the | |
1385 | * correctness of the format string and va_list arguments. | |
455cd5ab | 1386 | * - 'K' For a kernel pointer that should be hidden from unprivileged users |
c8f44aff | 1387 | * - 'NF' For a netdev_features_t |
31550a16 AS |
1388 | * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with |
1389 | * a certain separator (' ' by default): | |
1390 | * C colon | |
1391 | * D dash | |
1392 | * N no separator | |
1393 | * The maximum supported length is 64 bytes of the input. Consider | |
1394 | * to use print_hex_dump() for the larger input. | |
aaf07621 JP |
1395 | * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives |
1396 | * (default assumed to be phys_addr_t, passed by reference) | |
c0d92a57 OJ |
1397 | * - 'd[234]' For a dentry name (optionally 2-4 last components) |
1398 | * - 'D[234]' Same as 'd' but for a struct file | |
9ac6e44e | 1399 | * |
332d2e78 LT |
1400 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 |
1401 | * function pointers are really function descriptors, which contain a | |
1402 | * pointer to the real address. | |
4d8a743c | 1403 | */ |
cf3b429b JP |
1404 | static noinline_for_stack |
1405 | char *pointer(const char *fmt, char *buf, char *end, void *ptr, | |
1406 | struct printf_spec spec) | |
78a8bf69 | 1407 | { |
725fe002 GL |
1408 | int default_width = 2 * sizeof(void *) + (spec.flags & SPECIAL ? 2 : 0); |
1409 | ||
9f36e2c4 | 1410 | if (!ptr && *fmt != 'K') { |
5e057981 JP |
1411 | /* |
1412 | * Print (null) with the same width as a pointer so it makes | |
1413 | * tabular output look nice. | |
1414 | */ | |
1415 | if (spec.field_width == -1) | |
725fe002 | 1416 | spec.field_width = default_width; |
fef20d9c | 1417 | return string(buf, end, "(null)", spec); |
5e057981 | 1418 | } |
d97106ab | 1419 | |
0fe1ef24 LT |
1420 | switch (*fmt) { |
1421 | case 'F': | |
0c8b946e | 1422 | case 'f': |
0fe1ef24 LT |
1423 | ptr = dereference_function_descriptor(ptr); |
1424 | /* Fallthrough */ | |
1425 | case 'S': | |
9ac6e44e | 1426 | case 's': |
0f77a8d3 | 1427 | case 'B': |
b0d33c2b | 1428 | return symbol_string(buf, end, ptr, spec, fmt); |
332d2e78 | 1429 | case 'R': |
c7dabef8 | 1430 | case 'r': |
fd95541e | 1431 | return resource_string(buf, end, ptr, spec, fmt); |
31550a16 AS |
1432 | case 'h': |
1433 | return hex_string(buf, end, ptr, spec, fmt); | |
dbc760bc TH |
1434 | case 'b': |
1435 | switch (fmt[1]) { | |
1436 | case 'l': | |
1437 | return bitmap_list_string(buf, end, ptr, spec, fmt); | |
1438 | default: | |
1439 | return bitmap_string(buf, end, ptr, spec, fmt); | |
1440 | } | |
8a27f7c9 JP |
1441 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
1442 | case 'm': /* Contiguous: 000102030405 */ | |
76597ff9 AE |
1443 | /* [mM]F (FDDI) */ |
1444 | /* [mM]R (Reverse order; Bluetooth) */ | |
8a27f7c9 JP |
1445 | return mac_address_string(buf, end, ptr, spec, fmt); |
1446 | case 'I': /* Formatted IP supported | |
1447 | * 4: 1.2.3.4 | |
1448 | * 6: 0001:0203:...:0708 | |
1449 | * 6c: 1::708 or 1::1.2.3.4 | |
1450 | */ | |
1451 | case 'i': /* Contiguous: | |
1452 | * 4: 001.002.003.004 | |
1453 | * 6: 000102...0f | |
1454 | */ | |
1455 | switch (fmt[1]) { | |
1456 | case '6': | |
1457 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
1458 | case '4': | |
1459 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
10679643 DB |
1460 | case 'S': { |
1461 | const union { | |
1462 | struct sockaddr raw; | |
1463 | struct sockaddr_in v4; | |
1464 | struct sockaddr_in6 v6; | |
1465 | } *sa = ptr; | |
1466 | ||
1467 | switch (sa->raw.sa_family) { | |
1468 | case AF_INET: | |
1469 | return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt); | |
1470 | case AF_INET6: | |
1471 | return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt); | |
1472 | default: | |
1473 | return string(buf, end, "(invalid address)", spec); | |
1474 | }} | |
8a27f7c9 | 1475 | } |
fef20d9c | 1476 | break; |
71dca95d AS |
1477 | case 'E': |
1478 | return escaped_string(buf, end, ptr, spec, fmt); | |
9ac6e44e JP |
1479 | case 'U': |
1480 | return uuid_string(buf, end, ptr, spec, fmt); | |
7db6f5fb | 1481 | case 'V': |
5756b76e JB |
1482 | { |
1483 | va_list va; | |
1484 | ||
1485 | va_copy(va, *((struct va_format *)ptr)->va); | |
1486 | buf += vsnprintf(buf, end > buf ? end - buf : 0, | |
1487 | ((struct va_format *)ptr)->fmt, va); | |
1488 | va_end(va); | |
1489 | return buf; | |
1490 | } | |
455cd5ab DR |
1491 | case 'K': |
1492 | /* | |
1493 | * %pK cannot be used in IRQ context because its test | |
1494 | * for CAP_SYSLOG would be meaningless. | |
1495 | */ | |
3715c530 DR |
1496 | if (kptr_restrict && (in_irq() || in_serving_softirq() || |
1497 | in_nmi())) { | |
455cd5ab | 1498 | if (spec.field_width == -1) |
725fe002 | 1499 | spec.field_width = default_width; |
455cd5ab | 1500 | return string(buf, end, "pK-error", spec); |
455cd5ab | 1501 | } |
312b4e22 RM |
1502 | |
1503 | switch (kptr_restrict) { | |
1504 | case 0: | |
1505 | /* Always print %pK values */ | |
1506 | break; | |
1507 | case 1: { | |
1508 | /* | |
1509 | * Only print the real pointer value if the current | |
1510 | * process has CAP_SYSLOG and is running with the | |
1511 | * same credentials it started with. This is because | |
1512 | * access to files is checked at open() time, but %pK | |
1513 | * checks permission at read() time. We don't want to | |
1514 | * leak pointer values if a binary opens a file using | |
1515 | * %pK and then elevates privileges before reading it. | |
1516 | */ | |
1517 | const struct cred *cred = current_cred(); | |
1518 | ||
1519 | if (!has_capability_noaudit(current, CAP_SYSLOG) || | |
1520 | !uid_eq(cred->euid, cred->uid) || | |
1521 | !gid_eq(cred->egid, cred->gid)) | |
1522 | ptr = NULL; | |
1523 | break; | |
1524 | } | |
1525 | case 2: | |
1526 | default: | |
1527 | /* Always print 0's for %pK */ | |
26297607 | 1528 | ptr = NULL; |
312b4e22 RM |
1529 | break; |
1530 | } | |
26297607 | 1531 | break; |
312b4e22 | 1532 | |
c8f44aff MM |
1533 | case 'N': |
1534 | switch (fmt[1]) { | |
1535 | case 'F': | |
1536 | return netdev_feature_string(buf, end, ptr, spec); | |
1537 | } | |
1538 | break; | |
7d799210 | 1539 | case 'a': |
aaf07621 | 1540 | return address_val(buf, end, ptr, spec, fmt); |
4b6ccca7 AV |
1541 | case 'd': |
1542 | return dentry_name(buf, end, ptr, spec, fmt); | |
1543 | case 'D': | |
1544 | return dentry_name(buf, end, | |
1545 | ((const struct file *)ptr)->f_path.dentry, | |
1546 | spec, fmt); | |
fef20d9c FW |
1547 | } |
1548 | spec.flags |= SMALL; | |
1549 | if (spec.field_width == -1) { | |
725fe002 | 1550 | spec.field_width = default_width; |
fef20d9c FW |
1551 | spec.flags |= ZEROPAD; |
1552 | } | |
1553 | spec.base = 16; | |
1554 | ||
1555 | return number(buf, end, (unsigned long) ptr, spec); | |
1556 | } | |
1557 | ||
1558 | /* | |
1559 | * Helper function to decode printf style format. | |
1560 | * Each call decode a token from the format and return the | |
1561 | * number of characters read (or likely the delta where it wants | |
1562 | * to go on the next call). | |
1563 | * The decoded token is returned through the parameters | |
1564 | * | |
1565 | * 'h', 'l', or 'L' for integer fields | |
1566 | * 'z' support added 23/7/1999 S.H. | |
1567 | * 'z' changed to 'Z' --davidm 1/25/99 | |
1568 | * 't' added for ptrdiff_t | |
1569 | * | |
1570 | * @fmt: the format string | |
1571 | * @type of the token returned | |
1572 | * @flags: various flags such as +, -, # tokens.. | |
1573 | * @field_width: overwritten width | |
1574 | * @base: base of the number (octal, hex, ...) | |
1575 | * @precision: precision of a number | |
1576 | * @qualifier: qualifier of a number (long, size_t, ...) | |
1577 | */ | |
cf3b429b JP |
1578 | static noinline_for_stack |
1579 | int format_decode(const char *fmt, struct printf_spec *spec) | |
fef20d9c FW |
1580 | { |
1581 | const char *start = fmt; | |
fef20d9c FW |
1582 | |
1583 | /* we finished early by reading the field width */ | |
ed681a91 | 1584 | if (spec->type == FORMAT_TYPE_WIDTH) { |
fef20d9c FW |
1585 | if (spec->field_width < 0) { |
1586 | spec->field_width = -spec->field_width; | |
1587 | spec->flags |= LEFT; | |
1588 | } | |
1589 | spec->type = FORMAT_TYPE_NONE; | |
1590 | goto precision; | |
1591 | } | |
1592 | ||
1593 | /* we finished early by reading the precision */ | |
1594 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
1595 | if (spec->precision < 0) | |
1596 | spec->precision = 0; | |
1597 | ||
1598 | spec->type = FORMAT_TYPE_NONE; | |
1599 | goto qualifier; | |
1600 | } | |
1601 | ||
1602 | /* By default */ | |
1603 | spec->type = FORMAT_TYPE_NONE; | |
1604 | ||
1605 | for (; *fmt ; ++fmt) { | |
1606 | if (*fmt == '%') | |
1607 | break; | |
1608 | } | |
1609 | ||
1610 | /* Return the current non-format string */ | |
1611 | if (fmt != start || !*fmt) | |
1612 | return fmt - start; | |
1613 | ||
1614 | /* Process flags */ | |
1615 | spec->flags = 0; | |
1616 | ||
1617 | while (1) { /* this also skips first '%' */ | |
1618 | bool found = true; | |
1619 | ||
1620 | ++fmt; | |
1621 | ||
1622 | switch (*fmt) { | |
1623 | case '-': spec->flags |= LEFT; break; | |
1624 | case '+': spec->flags |= PLUS; break; | |
1625 | case ' ': spec->flags |= SPACE; break; | |
1626 | case '#': spec->flags |= SPECIAL; break; | |
1627 | case '0': spec->flags |= ZEROPAD; break; | |
1628 | default: found = false; | |
1629 | } | |
1630 | ||
1631 | if (!found) | |
1632 | break; | |
1633 | } | |
1634 | ||
1635 | /* get field width */ | |
1636 | spec->field_width = -1; | |
1637 | ||
1638 | if (isdigit(*fmt)) | |
1639 | spec->field_width = skip_atoi(&fmt); | |
1640 | else if (*fmt == '*') { | |
1641 | /* it's the next argument */ | |
ed681a91 | 1642 | spec->type = FORMAT_TYPE_WIDTH; |
fef20d9c FW |
1643 | return ++fmt - start; |
1644 | } | |
1645 | ||
1646 | precision: | |
1647 | /* get the precision */ | |
1648 | spec->precision = -1; | |
1649 | if (*fmt == '.') { | |
1650 | ++fmt; | |
1651 | if (isdigit(*fmt)) { | |
1652 | spec->precision = skip_atoi(&fmt); | |
1653 | if (spec->precision < 0) | |
1654 | spec->precision = 0; | |
1655 | } else if (*fmt == '*') { | |
1656 | /* it's the next argument */ | |
adf26f84 | 1657 | spec->type = FORMAT_TYPE_PRECISION; |
fef20d9c FW |
1658 | return ++fmt - start; |
1659 | } | |
1660 | } | |
1661 | ||
1662 | qualifier: | |
1663 | /* get the conversion qualifier */ | |
1664 | spec->qualifier = -1; | |
75fb8f26 AS |
1665 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
1666 | _tolower(*fmt) == 'z' || *fmt == 't') { | |
a4e94ef0 Z |
1667 | spec->qualifier = *fmt++; |
1668 | if (unlikely(spec->qualifier == *fmt)) { | |
1669 | if (spec->qualifier == 'l') { | |
1670 | spec->qualifier = 'L'; | |
1671 | ++fmt; | |
1672 | } else if (spec->qualifier == 'h') { | |
1673 | spec->qualifier = 'H'; | |
1674 | ++fmt; | |
1675 | } | |
fef20d9c FW |
1676 | } |
1677 | } | |
1678 | ||
1679 | /* default base */ | |
1680 | spec->base = 10; | |
1681 | switch (*fmt) { | |
1682 | case 'c': | |
1683 | spec->type = FORMAT_TYPE_CHAR; | |
1684 | return ++fmt - start; | |
1685 | ||
1686 | case 's': | |
1687 | spec->type = FORMAT_TYPE_STR; | |
1688 | return ++fmt - start; | |
1689 | ||
1690 | case 'p': | |
1691 | spec->type = FORMAT_TYPE_PTR; | |
ffbfed03 | 1692 | return ++fmt - start; |
fef20d9c | 1693 | |
fef20d9c FW |
1694 | case '%': |
1695 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
1696 | return ++fmt - start; | |
1697 | ||
1698 | /* integer number formats - set up the flags and "break" */ | |
1699 | case 'o': | |
1700 | spec->base = 8; | |
1701 | break; | |
1702 | ||
1703 | case 'x': | |
1704 | spec->flags |= SMALL; | |
1705 | ||
1706 | case 'X': | |
1707 | spec->base = 16; | |
1708 | break; | |
1709 | ||
1710 | case 'd': | |
1711 | case 'i': | |
39e874f8 | 1712 | spec->flags |= SIGN; |
fef20d9c | 1713 | case 'u': |
4aa99606 | 1714 | break; |
fef20d9c | 1715 | |
708d96fd RM |
1716 | case 'n': |
1717 | /* | |
1718 | * Since %n poses a greater security risk than utility, treat | |
1719 | * it as an invalid format specifier. Warn about its use so | |
1720 | * that new instances don't get added. | |
1721 | */ | |
1722 | WARN_ONCE(1, "Please remove ignored %%n in '%s'\n", fmt); | |
1723 | /* Fall-through */ | |
1724 | ||
fef20d9c FW |
1725 | default: |
1726 | spec->type = FORMAT_TYPE_INVALID; | |
1727 | return fmt - start; | |
0fe1ef24 | 1728 | } |
fef20d9c FW |
1729 | |
1730 | if (spec->qualifier == 'L') | |
1731 | spec->type = FORMAT_TYPE_LONG_LONG; | |
1732 | else if (spec->qualifier == 'l') { | |
51be17df RV |
1733 | BUILD_BUG_ON(FORMAT_TYPE_ULONG + SIGN != FORMAT_TYPE_LONG); |
1734 | spec->type = FORMAT_TYPE_ULONG + (spec->flags & SIGN); | |
75fb8f26 | 1735 | } else if (_tolower(spec->qualifier) == 'z') { |
fef20d9c FW |
1736 | spec->type = FORMAT_TYPE_SIZE_T; |
1737 | } else if (spec->qualifier == 't') { | |
1738 | spec->type = FORMAT_TYPE_PTRDIFF; | |
a4e94ef0 | 1739 | } else if (spec->qualifier == 'H') { |
51be17df RV |
1740 | BUILD_BUG_ON(FORMAT_TYPE_UBYTE + SIGN != FORMAT_TYPE_BYTE); |
1741 | spec->type = FORMAT_TYPE_UBYTE + (spec->flags & SIGN); | |
fef20d9c | 1742 | } else if (spec->qualifier == 'h') { |
51be17df RV |
1743 | BUILD_BUG_ON(FORMAT_TYPE_USHORT + SIGN != FORMAT_TYPE_SHORT); |
1744 | spec->type = FORMAT_TYPE_USHORT + (spec->flags & SIGN); | |
fef20d9c | 1745 | } else { |
51be17df RV |
1746 | BUILD_BUG_ON(FORMAT_TYPE_UINT + SIGN != FORMAT_TYPE_INT); |
1747 | spec->type = FORMAT_TYPE_UINT + (spec->flags & SIGN); | |
78a8bf69 | 1748 | } |
fef20d9c FW |
1749 | |
1750 | return ++fmt - start; | |
78a8bf69 LT |
1751 | } |
1752 | ||
1da177e4 LT |
1753 | /** |
1754 | * vsnprintf - Format a string and place it in a buffer | |
1755 | * @buf: The buffer to place the result into | |
1756 | * @size: The size of the buffer, including the trailing null space | |
1757 | * @fmt: The format string to use | |
1758 | * @args: Arguments for the format string | |
1759 | * | |
20036fdc | 1760 | * This function follows C99 vsnprintf, but has some extensions: |
91adcd2c SR |
1761 | * %pS output the name of a text symbol with offset |
1762 | * %ps output the name of a text symbol without offset | |
0c8b946e FW |
1763 | * %pF output the name of a function pointer with its offset |
1764 | * %pf output the name of a function pointer without its offset | |
0f77a8d3 | 1765 | * %pB output the name of a backtrace symbol with its offset |
8a79503a UKK |
1766 | * %pR output the address range in a struct resource with decoded flags |
1767 | * %pr output the address range in a struct resource with raw flags | |
dbc760bc TH |
1768 | * %pb output the bitmap with field width as the number of bits |
1769 | * %pbl output the bitmap as range list with field width as the number of bits | |
8a79503a | 1770 | * %pM output a 6-byte MAC address with colons |
7c59154e AS |
1771 | * %pMR output a 6-byte MAC address with colons in reversed order |
1772 | * %pMF output a 6-byte MAC address with dashes | |
8a79503a | 1773 | * %pm output a 6-byte MAC address without colons |
7c59154e | 1774 | * %pmR output a 6-byte MAC address without colons in reversed order |
8a79503a UKK |
1775 | * %pI4 print an IPv4 address without leading zeros |
1776 | * %pi4 print an IPv4 address with leading zeros | |
1777 | * %pI6 print an IPv6 address with colons | |
1778 | * %pi6 print an IPv6 address without colons | |
f996f208 | 1779 | * %pI6c print an IPv6 address as specified by RFC 5952 |
10679643 DB |
1780 | * %pIS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address |
1781 | * %piS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address | |
8a79503a UKK |
1782 | * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper |
1783 | * case. | |
71dca95d | 1784 | * %*pE[achnops] print an escaped buffer |
31550a16 AS |
1785 | * %*ph[CDN] a variable-length hex string with a separator (supports up to 64 |
1786 | * bytes of the input) | |
0efb4d20 | 1787 | * %n is ignored |
20036fdc | 1788 | * |
80f548e0 AM |
1789 | * ** Please update Documentation/printk-formats.txt when making changes ** |
1790 | * | |
1da177e4 LT |
1791 | * The return value is the number of characters which would |
1792 | * be generated for the given input, excluding the trailing | |
1793 | * '\0', as per ISO C99. If you want to have the exact | |
1794 | * number of characters written into @buf as return value | |
72fd4a35 | 1795 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
1796 | * return is greater than or equal to @size, the resulting |
1797 | * string is truncated. | |
1798 | * | |
ba1835eb | 1799 | * If you're not already dealing with a va_list consider using snprintf(). |
1da177e4 LT |
1800 | */ |
1801 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1802 | { | |
1da177e4 | 1803 | unsigned long long num; |
d4be151b | 1804 | char *str, *end; |
fef20d9c | 1805 | struct printf_spec spec = {0}; |
1da177e4 | 1806 | |
f796937a JF |
1807 | /* Reject out-of-range values early. Large positive sizes are |
1808 | used for unknown buffer sizes. */ | |
2aa2f9e2 | 1809 | if (WARN_ON_ONCE(size > INT_MAX)) |
1da177e4 | 1810 | return 0; |
1da177e4 LT |
1811 | |
1812 | str = buf; | |
f796937a | 1813 | end = buf + size; |
1da177e4 | 1814 | |
f796937a JF |
1815 | /* Make sure end is always >= buf */ |
1816 | if (end < buf) { | |
1817 | end = ((void *)-1); | |
1818 | size = end - buf; | |
1da177e4 LT |
1819 | } |
1820 | ||
fef20d9c FW |
1821 | while (*fmt) { |
1822 | const char *old_fmt = fmt; | |
d4be151b | 1823 | int read = format_decode(fmt, &spec); |
1da177e4 | 1824 | |
fef20d9c | 1825 | fmt += read; |
1da177e4 | 1826 | |
fef20d9c FW |
1827 | switch (spec.type) { |
1828 | case FORMAT_TYPE_NONE: { | |
1829 | int copy = read; | |
1830 | if (str < end) { | |
1831 | if (copy > end - str) | |
1832 | copy = end - str; | |
1833 | memcpy(str, old_fmt, copy); | |
1da177e4 | 1834 | } |
fef20d9c FW |
1835 | str += read; |
1836 | break; | |
1da177e4 LT |
1837 | } |
1838 | ||
ed681a91 | 1839 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1840 | spec.field_width = va_arg(args, int); |
1841 | break; | |
1da177e4 | 1842 | |
fef20d9c FW |
1843 | case FORMAT_TYPE_PRECISION: |
1844 | spec.precision = va_arg(args, int); | |
1845 | break; | |
1da177e4 | 1846 | |
d4be151b AGR |
1847 | case FORMAT_TYPE_CHAR: { |
1848 | char c; | |
1849 | ||
fef20d9c FW |
1850 | if (!(spec.flags & LEFT)) { |
1851 | while (--spec.field_width > 0) { | |
f796937a | 1852 | if (str < end) |
1da177e4 LT |
1853 | *str = ' '; |
1854 | ++str; | |
1da177e4 | 1855 | |
fef20d9c FW |
1856 | } |
1857 | } | |
1858 | c = (unsigned char) va_arg(args, int); | |
1859 | if (str < end) | |
1860 | *str = c; | |
1861 | ++str; | |
1862 | while (--spec.field_width > 0) { | |
f796937a | 1863 | if (str < end) |
fef20d9c | 1864 | *str = ' '; |
1da177e4 | 1865 | ++str; |
fef20d9c FW |
1866 | } |
1867 | break; | |
d4be151b | 1868 | } |
1da177e4 | 1869 | |
fef20d9c FW |
1870 | case FORMAT_TYPE_STR: |
1871 | str = string(str, end, va_arg(args, char *), spec); | |
1872 | break; | |
1da177e4 | 1873 | |
fef20d9c | 1874 | case FORMAT_TYPE_PTR: |
ffbfed03 | 1875 | str = pointer(fmt, str, end, va_arg(args, void *), |
fef20d9c FW |
1876 | spec); |
1877 | while (isalnum(*fmt)) | |
1878 | fmt++; | |
1879 | break; | |
1da177e4 | 1880 | |
fef20d9c FW |
1881 | case FORMAT_TYPE_PERCENT_CHAR: |
1882 | if (str < end) | |
1883 | *str = '%'; | |
1884 | ++str; | |
1885 | break; | |
1da177e4 | 1886 | |
fef20d9c FW |
1887 | case FORMAT_TYPE_INVALID: |
1888 | if (str < end) | |
1889 | *str = '%'; | |
1890 | ++str; | |
fef20d9c FW |
1891 | break; |
1892 | ||
fef20d9c FW |
1893 | default: |
1894 | switch (spec.type) { | |
1895 | case FORMAT_TYPE_LONG_LONG: | |
1896 | num = va_arg(args, long long); | |
1897 | break; | |
1898 | case FORMAT_TYPE_ULONG: | |
1899 | num = va_arg(args, unsigned long); | |
1900 | break; | |
1901 | case FORMAT_TYPE_LONG: | |
1902 | num = va_arg(args, long); | |
1903 | break; | |
1904 | case FORMAT_TYPE_SIZE_T: | |
ef124960 JG |
1905 | if (spec.flags & SIGN) |
1906 | num = va_arg(args, ssize_t); | |
1907 | else | |
1908 | num = va_arg(args, size_t); | |
fef20d9c FW |
1909 | break; |
1910 | case FORMAT_TYPE_PTRDIFF: | |
1911 | num = va_arg(args, ptrdiff_t); | |
1912 | break; | |
a4e94ef0 Z |
1913 | case FORMAT_TYPE_UBYTE: |
1914 | num = (unsigned char) va_arg(args, int); | |
1915 | break; | |
1916 | case FORMAT_TYPE_BYTE: | |
1917 | num = (signed char) va_arg(args, int); | |
1918 | break; | |
fef20d9c FW |
1919 | case FORMAT_TYPE_USHORT: |
1920 | num = (unsigned short) va_arg(args, int); | |
1921 | break; | |
1922 | case FORMAT_TYPE_SHORT: | |
1923 | num = (short) va_arg(args, int); | |
1924 | break; | |
39e874f8 FW |
1925 | case FORMAT_TYPE_INT: |
1926 | num = (int) va_arg(args, int); | |
fef20d9c FW |
1927 | break; |
1928 | default: | |
1929 | num = va_arg(args, unsigned int); | |
1930 | } | |
1931 | ||
1932 | str = number(str, end, num, spec); | |
1da177e4 | 1933 | } |
1da177e4 | 1934 | } |
fef20d9c | 1935 | |
f796937a JF |
1936 | if (size > 0) { |
1937 | if (str < end) | |
1938 | *str = '\0'; | |
1939 | else | |
0a6047ee | 1940 | end[-1] = '\0'; |
f796937a | 1941 | } |
fef20d9c | 1942 | |
f796937a | 1943 | /* the trailing null byte doesn't count towards the total */ |
1da177e4 | 1944 | return str-buf; |
fef20d9c | 1945 | |
1da177e4 | 1946 | } |
1da177e4 LT |
1947 | EXPORT_SYMBOL(vsnprintf); |
1948 | ||
1949 | /** | |
1950 | * vscnprintf - Format a string and place it in a buffer | |
1951 | * @buf: The buffer to place the result into | |
1952 | * @size: The size of the buffer, including the trailing null space | |
1953 | * @fmt: The format string to use | |
1954 | * @args: Arguments for the format string | |
1955 | * | |
1956 | * The return value is the number of characters which have been written into | |
b921c69f | 1957 | * the @buf not including the trailing '\0'. If @size is == 0 the function |
1da177e4 LT |
1958 | * returns 0. |
1959 | * | |
ba1835eb | 1960 | * If you're not already dealing with a va_list consider using scnprintf(). |
20036fdc AK |
1961 | * |
1962 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1963 | */ |
1964 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1965 | { | |
1966 | int i; | |
1967 | ||
7b9186f5 AGR |
1968 | i = vsnprintf(buf, size, fmt, args); |
1969 | ||
b921c69f AA |
1970 | if (likely(i < size)) |
1971 | return i; | |
1972 | if (size != 0) | |
1973 | return size - 1; | |
1974 | return 0; | |
1da177e4 | 1975 | } |
1da177e4 LT |
1976 | EXPORT_SYMBOL(vscnprintf); |
1977 | ||
1978 | /** | |
1979 | * snprintf - Format a string and place it in a buffer | |
1980 | * @buf: The buffer to place the result into | |
1981 | * @size: The size of the buffer, including the trailing null space | |
1982 | * @fmt: The format string to use | |
1983 | * @...: Arguments for the format string | |
1984 | * | |
1985 | * The return value is the number of characters which would be | |
1986 | * generated for the given input, excluding the trailing null, | |
1987 | * as per ISO C99. If the return is greater than or equal to | |
1988 | * @size, the resulting string is truncated. | |
20036fdc AK |
1989 | * |
1990 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 1991 | */ |
7b9186f5 | 1992 | int snprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
1993 | { |
1994 | va_list args; | |
1995 | int i; | |
1996 | ||
1997 | va_start(args, fmt); | |
7b9186f5 | 1998 | i = vsnprintf(buf, size, fmt, args); |
1da177e4 | 1999 | va_end(args); |
7b9186f5 | 2000 | |
1da177e4 LT |
2001 | return i; |
2002 | } | |
1da177e4 LT |
2003 | EXPORT_SYMBOL(snprintf); |
2004 | ||
2005 | /** | |
2006 | * scnprintf - Format a string and place it in a buffer | |
2007 | * @buf: The buffer to place the result into | |
2008 | * @size: The size of the buffer, including the trailing null space | |
2009 | * @fmt: The format string to use | |
2010 | * @...: Arguments for the format string | |
2011 | * | |
2012 | * The return value is the number of characters written into @buf not including | |
b903c0b8 | 2013 | * the trailing '\0'. If @size is == 0 the function returns 0. |
1da177e4 LT |
2014 | */ |
2015 | ||
7b9186f5 | 2016 | int scnprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
2017 | { |
2018 | va_list args; | |
2019 | int i; | |
2020 | ||
2021 | va_start(args, fmt); | |
b921c69f | 2022 | i = vscnprintf(buf, size, fmt, args); |
1da177e4 | 2023 | va_end(args); |
7b9186f5 | 2024 | |
b921c69f | 2025 | return i; |
1da177e4 LT |
2026 | } |
2027 | EXPORT_SYMBOL(scnprintf); | |
2028 | ||
2029 | /** | |
2030 | * vsprintf - Format a string and place it in a buffer | |
2031 | * @buf: The buffer to place the result into | |
2032 | * @fmt: The format string to use | |
2033 | * @args: Arguments for the format string | |
2034 | * | |
2035 | * The function returns the number of characters written | |
72fd4a35 | 2036 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
2037 | * buffer overflows. |
2038 | * | |
ba1835eb | 2039 | * If you're not already dealing with a va_list consider using sprintf(). |
20036fdc AK |
2040 | * |
2041 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
2042 | */ |
2043 | int vsprintf(char *buf, const char *fmt, va_list args) | |
2044 | { | |
2045 | return vsnprintf(buf, INT_MAX, fmt, args); | |
2046 | } | |
1da177e4 LT |
2047 | EXPORT_SYMBOL(vsprintf); |
2048 | ||
2049 | /** | |
2050 | * sprintf - Format a string and place it in a buffer | |
2051 | * @buf: The buffer to place the result into | |
2052 | * @fmt: The format string to use | |
2053 | * @...: Arguments for the format string | |
2054 | * | |
2055 | * The function returns the number of characters written | |
72fd4a35 | 2056 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 | 2057 | * buffer overflows. |
20036fdc AK |
2058 | * |
2059 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 2060 | */ |
7b9186f5 | 2061 | int sprintf(char *buf, const char *fmt, ...) |
1da177e4 LT |
2062 | { |
2063 | va_list args; | |
2064 | int i; | |
2065 | ||
2066 | va_start(args, fmt); | |
7b9186f5 | 2067 | i = vsnprintf(buf, INT_MAX, fmt, args); |
1da177e4 | 2068 | va_end(args); |
7b9186f5 | 2069 | |
1da177e4 LT |
2070 | return i; |
2071 | } | |
1da177e4 LT |
2072 | EXPORT_SYMBOL(sprintf); |
2073 | ||
4370aa4a LJ |
2074 | #ifdef CONFIG_BINARY_PRINTF |
2075 | /* | |
2076 | * bprintf service: | |
2077 | * vbin_printf() - VA arguments to binary data | |
2078 | * bstr_printf() - Binary data to text string | |
2079 | */ | |
2080 | ||
2081 | /** | |
2082 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
2083 | * @bin_buf: The buffer to place args' binary value | |
2084 | * @size: The size of the buffer(by words(32bits), not characters) | |
2085 | * @fmt: The format string to use | |
2086 | * @args: Arguments for the format string | |
2087 | * | |
2088 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
da3dae54 | 2089 | * is skipped. |
4370aa4a LJ |
2090 | * |
2091 | * The return value is the number of words(32bits) which would be generated for | |
2092 | * the given input. | |
2093 | * | |
2094 | * NOTE: | |
2095 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
2096 | * valid for bstr_printf(). | |
2097 | */ | |
2098 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
2099 | { | |
fef20d9c | 2100 | struct printf_spec spec = {0}; |
4370aa4a | 2101 | char *str, *end; |
4370aa4a LJ |
2102 | |
2103 | str = (char *)bin_buf; | |
2104 | end = (char *)(bin_buf + size); | |
2105 | ||
2106 | #define save_arg(type) \ | |
2107 | do { \ | |
2108 | if (sizeof(type) == 8) { \ | |
2109 | unsigned long long value; \ | |
2110 | str = PTR_ALIGN(str, sizeof(u32)); \ | |
2111 | value = va_arg(args, unsigned long long); \ | |
2112 | if (str + sizeof(type) <= end) { \ | |
2113 | *(u32 *)str = *(u32 *)&value; \ | |
2114 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ | |
2115 | } \ | |
2116 | } else { \ | |
2117 | unsigned long value; \ | |
2118 | str = PTR_ALIGN(str, sizeof(type)); \ | |
2119 | value = va_arg(args, int); \ | |
2120 | if (str + sizeof(type) <= end) \ | |
2121 | *(typeof(type) *)str = (type)value; \ | |
2122 | } \ | |
2123 | str += sizeof(type); \ | |
2124 | } while (0) | |
2125 | ||
fef20d9c | 2126 | while (*fmt) { |
d4be151b | 2127 | int read = format_decode(fmt, &spec); |
4370aa4a | 2128 | |
fef20d9c | 2129 | fmt += read; |
4370aa4a | 2130 | |
fef20d9c FW |
2131 | switch (spec.type) { |
2132 | case FORMAT_TYPE_NONE: | |
d4be151b AGR |
2133 | case FORMAT_TYPE_INVALID: |
2134 | case FORMAT_TYPE_PERCENT_CHAR: | |
fef20d9c FW |
2135 | break; |
2136 | ||
ed681a91 | 2137 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
2138 | case FORMAT_TYPE_PRECISION: |
2139 | save_arg(int); | |
2140 | break; | |
2141 | ||
2142 | case FORMAT_TYPE_CHAR: | |
4370aa4a | 2143 | save_arg(char); |
fef20d9c FW |
2144 | break; |
2145 | ||
2146 | case FORMAT_TYPE_STR: { | |
4370aa4a LJ |
2147 | const char *save_str = va_arg(args, char *); |
2148 | size_t len; | |
6c356634 | 2149 | |
4370aa4a LJ |
2150 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE |
2151 | || (unsigned long)save_str < PAGE_SIZE) | |
0f4f81dc | 2152 | save_str = "(null)"; |
6c356634 AGR |
2153 | len = strlen(save_str) + 1; |
2154 | if (str + len < end) | |
2155 | memcpy(str, save_str, len); | |
2156 | str += len; | |
fef20d9c | 2157 | break; |
4370aa4a | 2158 | } |
fef20d9c FW |
2159 | |
2160 | case FORMAT_TYPE_PTR: | |
4370aa4a LJ |
2161 | save_arg(void *); |
2162 | /* skip all alphanumeric pointer suffixes */ | |
fef20d9c | 2163 | while (isalnum(*fmt)) |
4370aa4a | 2164 | fmt++; |
fef20d9c FW |
2165 | break; |
2166 | ||
fef20d9c FW |
2167 | default: |
2168 | switch (spec.type) { | |
2169 | ||
2170 | case FORMAT_TYPE_LONG_LONG: | |
4370aa4a | 2171 | save_arg(long long); |
fef20d9c FW |
2172 | break; |
2173 | case FORMAT_TYPE_ULONG: | |
2174 | case FORMAT_TYPE_LONG: | |
4370aa4a | 2175 | save_arg(unsigned long); |
fef20d9c FW |
2176 | break; |
2177 | case FORMAT_TYPE_SIZE_T: | |
4370aa4a | 2178 | save_arg(size_t); |
fef20d9c FW |
2179 | break; |
2180 | case FORMAT_TYPE_PTRDIFF: | |
4370aa4a | 2181 | save_arg(ptrdiff_t); |
fef20d9c | 2182 | break; |
a4e94ef0 Z |
2183 | case FORMAT_TYPE_UBYTE: |
2184 | case FORMAT_TYPE_BYTE: | |
2185 | save_arg(char); | |
2186 | break; | |
fef20d9c FW |
2187 | case FORMAT_TYPE_USHORT: |
2188 | case FORMAT_TYPE_SHORT: | |
4370aa4a | 2189 | save_arg(short); |
fef20d9c FW |
2190 | break; |
2191 | default: | |
4370aa4a | 2192 | save_arg(int); |
fef20d9c | 2193 | } |
4370aa4a LJ |
2194 | } |
2195 | } | |
fef20d9c | 2196 | |
7b9186f5 | 2197 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
fef20d9c | 2198 | #undef save_arg |
4370aa4a LJ |
2199 | } |
2200 | EXPORT_SYMBOL_GPL(vbin_printf); | |
2201 | ||
2202 | /** | |
2203 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
2204 | * @buf: The buffer to place the result into | |
2205 | * @size: The size of the buffer, including the trailing null space | |
2206 | * @fmt: The format string to use | |
2207 | * @bin_buf: Binary arguments for the format string | |
2208 | * | |
2209 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
2210 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
2211 | * a binary buffer that generated by vbin_printf. | |
2212 | * | |
2213 | * The format follows C99 vsnprintf, but has some extensions: | |
0efb4d20 | 2214 | * see vsnprintf comment for details. |
4370aa4a LJ |
2215 | * |
2216 | * The return value is the number of characters which would | |
2217 | * be generated for the given input, excluding the trailing | |
2218 | * '\0', as per ISO C99. If you want to have the exact | |
2219 | * number of characters written into @buf as return value | |
2220 | * (not including the trailing '\0'), use vscnprintf(). If the | |
2221 | * return is greater than or equal to @size, the resulting | |
2222 | * string is truncated. | |
2223 | */ | |
2224 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
2225 | { | |
fef20d9c | 2226 | struct printf_spec spec = {0}; |
d4be151b AGR |
2227 | char *str, *end; |
2228 | const char *args = (const char *)bin_buf; | |
4370aa4a | 2229 | |
2f30b1f9 | 2230 | if (WARN_ON_ONCE((int) size < 0)) |
4370aa4a | 2231 | return 0; |
4370aa4a LJ |
2232 | |
2233 | str = buf; | |
2234 | end = buf + size; | |
2235 | ||
2236 | #define get_arg(type) \ | |
2237 | ({ \ | |
2238 | typeof(type) value; \ | |
2239 | if (sizeof(type) == 8) { \ | |
2240 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
2241 | *(u32 *)&value = *(u32 *)args; \ | |
2242 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
2243 | } else { \ | |
2244 | args = PTR_ALIGN(args, sizeof(type)); \ | |
2245 | value = *(typeof(type) *)args; \ | |
2246 | } \ | |
2247 | args += sizeof(type); \ | |
2248 | value; \ | |
2249 | }) | |
2250 | ||
2251 | /* Make sure end is always >= buf */ | |
2252 | if (end < buf) { | |
2253 | end = ((void *)-1); | |
2254 | size = end - buf; | |
2255 | } | |
2256 | ||
fef20d9c | 2257 | while (*fmt) { |
fef20d9c | 2258 | const char *old_fmt = fmt; |
d4be151b | 2259 | int read = format_decode(fmt, &spec); |
4370aa4a | 2260 | |
fef20d9c | 2261 | fmt += read; |
4370aa4a | 2262 | |
fef20d9c FW |
2263 | switch (spec.type) { |
2264 | case FORMAT_TYPE_NONE: { | |
2265 | int copy = read; | |
2266 | if (str < end) { | |
2267 | if (copy > end - str) | |
2268 | copy = end - str; | |
2269 | memcpy(str, old_fmt, copy); | |
4370aa4a | 2270 | } |
fef20d9c FW |
2271 | str += read; |
2272 | break; | |
4370aa4a LJ |
2273 | } |
2274 | ||
ed681a91 | 2275 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
2276 | spec.field_width = get_arg(int); |
2277 | break; | |
4370aa4a | 2278 | |
fef20d9c FW |
2279 | case FORMAT_TYPE_PRECISION: |
2280 | spec.precision = get_arg(int); | |
2281 | break; | |
4370aa4a | 2282 | |
d4be151b AGR |
2283 | case FORMAT_TYPE_CHAR: { |
2284 | char c; | |
2285 | ||
fef20d9c FW |
2286 | if (!(spec.flags & LEFT)) { |
2287 | while (--spec.field_width > 0) { | |
4370aa4a LJ |
2288 | if (str < end) |
2289 | *str = ' '; | |
2290 | ++str; | |
2291 | } | |
2292 | } | |
2293 | c = (unsigned char) get_arg(char); | |
2294 | if (str < end) | |
2295 | *str = c; | |
2296 | ++str; | |
fef20d9c | 2297 | while (--spec.field_width > 0) { |
4370aa4a LJ |
2298 | if (str < end) |
2299 | *str = ' '; | |
2300 | ++str; | |
2301 | } | |
fef20d9c | 2302 | break; |
d4be151b | 2303 | } |
4370aa4a | 2304 | |
fef20d9c | 2305 | case FORMAT_TYPE_STR: { |
4370aa4a | 2306 | const char *str_arg = args; |
d4be151b | 2307 | args += strlen(str_arg) + 1; |
fef20d9c FW |
2308 | str = string(str, end, (char *)str_arg, spec); |
2309 | break; | |
4370aa4a LJ |
2310 | } |
2311 | ||
fef20d9c | 2312 | case FORMAT_TYPE_PTR: |
ffbfed03 | 2313 | str = pointer(fmt, str, end, get_arg(void *), spec); |
fef20d9c | 2314 | while (isalnum(*fmt)) |
4370aa4a | 2315 | fmt++; |
fef20d9c | 2316 | break; |
4370aa4a | 2317 | |
fef20d9c | 2318 | case FORMAT_TYPE_PERCENT_CHAR: |
fef20d9c | 2319 | case FORMAT_TYPE_INVALID: |
4370aa4a LJ |
2320 | if (str < end) |
2321 | *str = '%'; | |
2322 | ++str; | |
fef20d9c FW |
2323 | break; |
2324 | ||
d4be151b AGR |
2325 | default: { |
2326 | unsigned long long num; | |
2327 | ||
fef20d9c FW |
2328 | switch (spec.type) { |
2329 | ||
2330 | case FORMAT_TYPE_LONG_LONG: | |
2331 | num = get_arg(long long); | |
2332 | break; | |
2333 | case FORMAT_TYPE_ULONG: | |
fef20d9c FW |
2334 | case FORMAT_TYPE_LONG: |
2335 | num = get_arg(unsigned long); | |
2336 | break; | |
2337 | case FORMAT_TYPE_SIZE_T: | |
2338 | num = get_arg(size_t); | |
2339 | break; | |
2340 | case FORMAT_TYPE_PTRDIFF: | |
2341 | num = get_arg(ptrdiff_t); | |
2342 | break; | |
a4e94ef0 Z |
2343 | case FORMAT_TYPE_UBYTE: |
2344 | num = get_arg(unsigned char); | |
2345 | break; | |
2346 | case FORMAT_TYPE_BYTE: | |
2347 | num = get_arg(signed char); | |
2348 | break; | |
fef20d9c FW |
2349 | case FORMAT_TYPE_USHORT: |
2350 | num = get_arg(unsigned short); | |
2351 | break; | |
2352 | case FORMAT_TYPE_SHORT: | |
2353 | num = get_arg(short); | |
2354 | break; | |
2355 | case FORMAT_TYPE_UINT: | |
2356 | num = get_arg(unsigned int); | |
2357 | break; | |
2358 | default: | |
2359 | num = get_arg(int); | |
2360 | } | |
2361 | ||
2362 | str = number(str, end, num, spec); | |
d4be151b AGR |
2363 | } /* default: */ |
2364 | } /* switch(spec.type) */ | |
2365 | } /* while(*fmt) */ | |
fef20d9c | 2366 | |
4370aa4a LJ |
2367 | if (size > 0) { |
2368 | if (str < end) | |
2369 | *str = '\0'; | |
2370 | else | |
2371 | end[-1] = '\0'; | |
2372 | } | |
fef20d9c | 2373 | |
4370aa4a LJ |
2374 | #undef get_arg |
2375 | ||
2376 | /* the trailing null byte doesn't count towards the total */ | |
2377 | return str - buf; | |
2378 | } | |
2379 | EXPORT_SYMBOL_GPL(bstr_printf); | |
2380 | ||
2381 | /** | |
2382 | * bprintf - Parse a format string and place args' binary value in a buffer | |
2383 | * @bin_buf: The buffer to place args' binary value | |
2384 | * @size: The size of the buffer(by words(32bits), not characters) | |
2385 | * @fmt: The format string to use | |
2386 | * @...: Arguments for the format string | |
2387 | * | |
2388 | * The function returns the number of words(u32) written | |
2389 | * into @bin_buf. | |
2390 | */ | |
2391 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
2392 | { | |
2393 | va_list args; | |
2394 | int ret; | |
2395 | ||
2396 | va_start(args, fmt); | |
2397 | ret = vbin_printf(bin_buf, size, fmt, args); | |
2398 | va_end(args); | |
7b9186f5 | 2399 | |
4370aa4a LJ |
2400 | return ret; |
2401 | } | |
2402 | EXPORT_SYMBOL_GPL(bprintf); | |
2403 | ||
2404 | #endif /* CONFIG_BINARY_PRINTF */ | |
2405 | ||
1da177e4 LT |
2406 | /** |
2407 | * vsscanf - Unformat a buffer into a list of arguments | |
2408 | * @buf: input buffer | |
2409 | * @fmt: format of buffer | |
2410 | * @args: arguments | |
2411 | */ | |
7b9186f5 | 2412 | int vsscanf(const char *buf, const char *fmt, va_list args) |
1da177e4 LT |
2413 | { |
2414 | const char *str = buf; | |
2415 | char *next; | |
2416 | char digit; | |
2417 | int num = 0; | |
ef0658f3 | 2418 | u8 qualifier; |
53809751 JB |
2419 | unsigned int base; |
2420 | union { | |
2421 | long long s; | |
2422 | unsigned long long u; | |
2423 | } val; | |
ef0658f3 | 2424 | s16 field_width; |
d4be151b | 2425 | bool is_sign; |
1da177e4 | 2426 | |
da99075c | 2427 | while (*fmt) { |
1da177e4 LT |
2428 | /* skip any white space in format */ |
2429 | /* white space in format matchs any amount of | |
2430 | * white space, including none, in the input. | |
2431 | */ | |
2432 | if (isspace(*fmt)) { | |
e7d2860b AGR |
2433 | fmt = skip_spaces(++fmt); |
2434 | str = skip_spaces(str); | |
1da177e4 LT |
2435 | } |
2436 | ||
2437 | /* anything that is not a conversion must match exactly */ | |
2438 | if (*fmt != '%' && *fmt) { | |
2439 | if (*fmt++ != *str++) | |
2440 | break; | |
2441 | continue; | |
2442 | } | |
2443 | ||
2444 | if (!*fmt) | |
2445 | break; | |
2446 | ++fmt; | |
7b9186f5 | 2447 | |
1da177e4 LT |
2448 | /* skip this conversion. |
2449 | * advance both strings to next white space | |
2450 | */ | |
2451 | if (*fmt == '*') { | |
da99075c JB |
2452 | if (!*str) |
2453 | break; | |
8fccae2c | 2454 | while (!isspace(*fmt) && *fmt != '%' && *fmt) |
1da177e4 LT |
2455 | fmt++; |
2456 | while (!isspace(*str) && *str) | |
2457 | str++; | |
2458 | continue; | |
2459 | } | |
2460 | ||
2461 | /* get field width */ | |
2462 | field_width = -1; | |
53809751 | 2463 | if (isdigit(*fmt)) { |
1da177e4 | 2464 | field_width = skip_atoi(&fmt); |
53809751 JB |
2465 | if (field_width <= 0) |
2466 | break; | |
2467 | } | |
1da177e4 LT |
2468 | |
2469 | /* get conversion qualifier */ | |
2470 | qualifier = -1; | |
75fb8f26 AS |
2471 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
2472 | _tolower(*fmt) == 'z') { | |
1da177e4 LT |
2473 | qualifier = *fmt++; |
2474 | if (unlikely(qualifier == *fmt)) { | |
2475 | if (qualifier == 'h') { | |
2476 | qualifier = 'H'; | |
2477 | fmt++; | |
2478 | } else if (qualifier == 'l') { | |
2479 | qualifier = 'L'; | |
2480 | fmt++; | |
2481 | } | |
2482 | } | |
2483 | } | |
1da177e4 | 2484 | |
da99075c JB |
2485 | if (!*fmt) |
2486 | break; | |
2487 | ||
2488 | if (*fmt == 'n') { | |
2489 | /* return number of characters read so far */ | |
2490 | *va_arg(args, int *) = str - buf; | |
2491 | ++fmt; | |
2492 | continue; | |
2493 | } | |
2494 | ||
2495 | if (!*str) | |
1da177e4 LT |
2496 | break; |
2497 | ||
d4be151b | 2498 | base = 10; |
3f623eba | 2499 | is_sign = false; |
d4be151b | 2500 | |
7b9186f5 | 2501 | switch (*fmt++) { |
1da177e4 LT |
2502 | case 'c': |
2503 | { | |
7b9186f5 | 2504 | char *s = (char *)va_arg(args, char*); |
1da177e4 LT |
2505 | if (field_width == -1) |
2506 | field_width = 1; | |
2507 | do { | |
2508 | *s++ = *str++; | |
2509 | } while (--field_width > 0 && *str); | |
2510 | num++; | |
2511 | } | |
2512 | continue; | |
2513 | case 's': | |
2514 | { | |
7b9186f5 AGR |
2515 | char *s = (char *)va_arg(args, char *); |
2516 | if (field_width == -1) | |
4be929be | 2517 | field_width = SHRT_MAX; |
1da177e4 | 2518 | /* first, skip leading white space in buffer */ |
e7d2860b | 2519 | str = skip_spaces(str); |
1da177e4 LT |
2520 | |
2521 | /* now copy until next white space */ | |
7b9186f5 | 2522 | while (*str && !isspace(*str) && field_width--) |
1da177e4 | 2523 | *s++ = *str++; |
1da177e4 LT |
2524 | *s = '\0'; |
2525 | num++; | |
2526 | } | |
2527 | continue; | |
1da177e4 LT |
2528 | case 'o': |
2529 | base = 8; | |
2530 | break; | |
2531 | case 'x': | |
2532 | case 'X': | |
2533 | base = 16; | |
2534 | break; | |
2535 | case 'i': | |
7b9186f5 | 2536 | base = 0; |
1da177e4 | 2537 | case 'd': |
3f623eba | 2538 | is_sign = true; |
1da177e4 LT |
2539 | case 'u': |
2540 | break; | |
2541 | case '%': | |
2542 | /* looking for '%' in str */ | |
7b9186f5 | 2543 | if (*str++ != '%') |
1da177e4 LT |
2544 | return num; |
2545 | continue; | |
2546 | default: | |
2547 | /* invalid format; stop here */ | |
2548 | return num; | |
2549 | } | |
2550 | ||
2551 | /* have some sort of integer conversion. | |
2552 | * first, skip white space in buffer. | |
2553 | */ | |
e7d2860b | 2554 | str = skip_spaces(str); |
1da177e4 LT |
2555 | |
2556 | digit = *str; | |
2557 | if (is_sign && digit == '-') | |
2558 | digit = *(str + 1); | |
2559 | ||
2560 | if (!digit | |
7b9186f5 AGR |
2561 | || (base == 16 && !isxdigit(digit)) |
2562 | || (base == 10 && !isdigit(digit)) | |
2563 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
2564 | || (base == 0 && !isdigit(digit))) | |
2565 | break; | |
1da177e4 | 2566 | |
53809751 JB |
2567 | if (is_sign) |
2568 | val.s = qualifier != 'L' ? | |
2569 | simple_strtol(str, &next, base) : | |
2570 | simple_strtoll(str, &next, base); | |
2571 | else | |
2572 | val.u = qualifier != 'L' ? | |
2573 | simple_strtoul(str, &next, base) : | |
2574 | simple_strtoull(str, &next, base); | |
2575 | ||
2576 | if (field_width > 0 && next - str > field_width) { | |
2577 | if (base == 0) | |
2578 | _parse_integer_fixup_radix(str, &base); | |
2579 | while (next - str > field_width) { | |
2580 | if (is_sign) | |
2581 | val.s = div_s64(val.s, base); | |
2582 | else | |
2583 | val.u = div_u64(val.u, base); | |
2584 | --next; | |
2585 | } | |
2586 | } | |
2587 | ||
7b9186f5 | 2588 | switch (qualifier) { |
1da177e4 | 2589 | case 'H': /* that's 'hh' in format */ |
53809751 JB |
2590 | if (is_sign) |
2591 | *va_arg(args, signed char *) = val.s; | |
2592 | else | |
2593 | *va_arg(args, unsigned char *) = val.u; | |
1da177e4 LT |
2594 | break; |
2595 | case 'h': | |
53809751 JB |
2596 | if (is_sign) |
2597 | *va_arg(args, short *) = val.s; | |
2598 | else | |
2599 | *va_arg(args, unsigned short *) = val.u; | |
1da177e4 LT |
2600 | break; |
2601 | case 'l': | |
53809751 JB |
2602 | if (is_sign) |
2603 | *va_arg(args, long *) = val.s; | |
2604 | else | |
2605 | *va_arg(args, unsigned long *) = val.u; | |
1da177e4 LT |
2606 | break; |
2607 | case 'L': | |
53809751 JB |
2608 | if (is_sign) |
2609 | *va_arg(args, long long *) = val.s; | |
2610 | else | |
2611 | *va_arg(args, unsigned long long *) = val.u; | |
1da177e4 LT |
2612 | break; |
2613 | case 'Z': | |
2614 | case 'z': | |
53809751 JB |
2615 | *va_arg(args, size_t *) = val.u; |
2616 | break; | |
1da177e4 | 2617 | default: |
53809751 JB |
2618 | if (is_sign) |
2619 | *va_arg(args, int *) = val.s; | |
2620 | else | |
2621 | *va_arg(args, unsigned int *) = val.u; | |
1da177e4 LT |
2622 | break; |
2623 | } | |
2624 | num++; | |
2625 | ||
2626 | if (!next) | |
2627 | break; | |
2628 | str = next; | |
2629 | } | |
c6b40d16 | 2630 | |
1da177e4 LT |
2631 | return num; |
2632 | } | |
1da177e4 LT |
2633 | EXPORT_SYMBOL(vsscanf); |
2634 | ||
2635 | /** | |
2636 | * sscanf - Unformat a buffer into a list of arguments | |
2637 | * @buf: input buffer | |
2638 | * @fmt: formatting of buffer | |
2639 | * @...: resulting arguments | |
2640 | */ | |
7b9186f5 | 2641 | int sscanf(const char *buf, const char *fmt, ...) |
1da177e4 LT |
2642 | { |
2643 | va_list args; | |
2644 | int i; | |
2645 | ||
7b9186f5 AGR |
2646 | va_start(args, fmt); |
2647 | i = vsscanf(buf, fmt, args); | |
1da177e4 | 2648 | va_end(args); |
7b9186f5 | 2649 | |
1da177e4 LT |
2650 | return i; |
2651 | } | |
1da177e4 | 2652 | EXPORT_SYMBOL(sscanf); |