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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> | |
900cca29 | 20 | #include <linux/clk-provider.h> |
8bc3bcc9 | 21 | #include <linux/module.h> /* for KSYM_SYMBOL_LEN */ |
1da177e4 LT |
22 | #include <linux/types.h> |
23 | #include <linux/string.h> | |
24 | #include <linux/ctype.h> | |
25 | #include <linux/kernel.h> | |
0fe1ef24 | 26 | #include <linux/kallsyms.h> |
53809751 | 27 | #include <linux/math64.h> |
0fe1ef24 | 28 | #include <linux/uaccess.h> |
332d2e78 | 29 | #include <linux/ioport.h> |
4b6ccca7 | 30 | #include <linux/dcache.h> |
312b4e22 | 31 | #include <linux/cred.h> |
8a27f7c9 | 32 | #include <net/addrconf.h> |
1da177e4 | 33 | |
4e57b681 | 34 | #include <asm/page.h> /* for PAGE_SIZE */ |
deac93df | 35 | #include <asm/sections.h> /* for dereference_function_descriptor() */ |
1da177e4 | 36 | |
71dca95d | 37 | #include <linux/string_helpers.h> |
1dff46d6 | 38 | #include "kstrtox.h" |
aa46a63e | 39 | |
1da177e4 | 40 | /** |
922ac25c | 41 | * simple_strtoull - convert a string to an unsigned long long |
1da177e4 LT |
42 | * @cp: The start of the string |
43 | * @endp: A pointer to the end of the parsed string will be placed here | |
44 | * @base: The number base to use | |
462e4711 EZ |
45 | * |
46 | * This function is obsolete. Please use kstrtoull instead. | |
1da177e4 | 47 | */ |
922ac25c | 48 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
1da177e4 | 49 | { |
1dff46d6 AD |
50 | unsigned long long result; |
51 | unsigned int rv; | |
aa46a63e | 52 | |
1dff46d6 AD |
53 | cp = _parse_integer_fixup_radix(cp, &base); |
54 | rv = _parse_integer(cp, base, &result); | |
55 | /* FIXME */ | |
56 | cp += (rv & ~KSTRTOX_OVERFLOW); | |
aa46a63e | 57 | |
1da177e4 LT |
58 | if (endp) |
59 | *endp = (char *)cp; | |
7b9186f5 | 60 | |
1da177e4 LT |
61 | return result; |
62 | } | |
922ac25c | 63 | EXPORT_SYMBOL(simple_strtoull); |
1da177e4 LT |
64 | |
65 | /** | |
922ac25c | 66 | * simple_strtoul - convert a string to an unsigned long |
1da177e4 LT |
67 | * @cp: The start of the string |
68 | * @endp: A pointer to the end of the parsed string will be placed here | |
69 | * @base: The number base to use | |
462e4711 EZ |
70 | * |
71 | * This function is obsolete. Please use kstrtoul instead. | |
1da177e4 | 72 | */ |
922ac25c | 73 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
1da177e4 | 74 | { |
922ac25c | 75 | return simple_strtoull(cp, endp, base); |
1da177e4 | 76 | } |
922ac25c | 77 | EXPORT_SYMBOL(simple_strtoul); |
1da177e4 LT |
78 | |
79 | /** | |
922ac25c | 80 | * simple_strtol - convert a string to a signed long |
1da177e4 LT |
81 | * @cp: The start of the string |
82 | * @endp: A pointer to the end of the parsed string will be placed here | |
83 | * @base: The number base to use | |
462e4711 EZ |
84 | * |
85 | * This function is obsolete. Please use kstrtol instead. | |
1da177e4 | 86 | */ |
922ac25c | 87 | long simple_strtol(const char *cp, char **endp, unsigned int base) |
1da177e4 | 88 | { |
922ac25c AGR |
89 | if (*cp == '-') |
90 | return -simple_strtoul(cp + 1, endp, base); | |
7b9186f5 | 91 | |
922ac25c | 92 | return simple_strtoul(cp, endp, base); |
1da177e4 | 93 | } |
922ac25c | 94 | EXPORT_SYMBOL(simple_strtol); |
1da177e4 LT |
95 | |
96 | /** | |
97 | * simple_strtoll - convert a string to a signed long long | |
98 | * @cp: The start of the string | |
99 | * @endp: A pointer to the end of the parsed string will be placed here | |
100 | * @base: The number base to use | |
462e4711 EZ |
101 | * |
102 | * This function is obsolete. Please use kstrtoll instead. | |
1da177e4 | 103 | */ |
22d27051 | 104 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
1da177e4 | 105 | { |
7b9186f5 | 106 | if (*cp == '-') |
22d27051 | 107 | return -simple_strtoull(cp + 1, endp, base); |
7b9186f5 | 108 | |
22d27051 | 109 | return simple_strtoull(cp, endp, base); |
1da177e4 | 110 | } |
98d5ce0d | 111 | EXPORT_SYMBOL(simple_strtoll); |
1da177e4 | 112 | |
cf3b429b JP |
113 | static noinline_for_stack |
114 | int skip_atoi(const char **s) | |
1da177e4 | 115 | { |
7b9186f5 | 116 | int i = 0; |
1da177e4 | 117 | |
43e5b666 | 118 | do { |
1da177e4 | 119 | i = i*10 + *((*s)++) - '0'; |
43e5b666 | 120 | } while (isdigit(**s)); |
7b9186f5 | 121 | |
1da177e4 LT |
122 | return i; |
123 | } | |
124 | ||
4277eedd DV |
125 | /* Decimal conversion is by far the most typical, and is used |
126 | * for /proc and /sys data. This directly impacts e.g. top performance | |
127 | * with many processes running. We optimize it for speed | |
133fd9f5 DV |
128 | * using ideas described at <http://www.cs.uiowa.edu/~jones/bcd/divide.html> |
129 | * (with permission from the author, Douglas W. Jones). | |
130 | */ | |
4277eedd | 131 | |
133fd9f5 DV |
132 | #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64 |
133 | /* Formats correctly any integer in [0, 999999999] */ | |
cf3b429b | 134 | static noinline_for_stack |
133fd9f5 | 135 | char *put_dec_full9(char *buf, unsigned q) |
4277eedd | 136 | { |
133fd9f5 | 137 | unsigned r; |
7b9186f5 | 138 | |
133fd9f5 DV |
139 | /* |
140 | * Possible ways to approx. divide by 10 | |
141 | * (x * 0x1999999a) >> 32 x < 1073741829 (multiply must be 64-bit) | |
142 | * (x * 0xcccd) >> 19 x < 81920 (x < 262149 when 64-bit mul) | |
143 | * (x * 0x6667) >> 18 x < 43699 | |
144 | * (x * 0x3334) >> 17 x < 16389 | |
145 | * (x * 0x199a) >> 16 x < 16389 | |
146 | * (x * 0x0ccd) >> 15 x < 16389 | |
147 | * (x * 0x0667) >> 14 x < 2739 | |
148 | * (x * 0x0334) >> 13 x < 1029 | |
149 | * (x * 0x019a) >> 12 x < 1029 | |
150 | * (x * 0x00cd) >> 11 x < 1029 shorter code than * 0x67 (on i386) | |
151 | * (x * 0x0067) >> 10 x < 179 | |
152 | * (x * 0x0034) >> 9 x < 69 same | |
153 | * (x * 0x001a) >> 8 x < 69 same | |
154 | * (x * 0x000d) >> 7 x < 69 same, shortest code (on i386) | |
155 | * (x * 0x0007) >> 6 x < 19 | |
156 | * See <http://www.cs.uiowa.edu/~jones/bcd/divide.html> | |
157 | */ | |
158 | r = (q * (uint64_t)0x1999999a) >> 32; | |
159 | *buf++ = (q - 10 * r) + '0'; /* 1 */ | |
160 | q = (r * (uint64_t)0x1999999a) >> 32; | |
161 | *buf++ = (r - 10 * q) + '0'; /* 2 */ | |
162 | r = (q * (uint64_t)0x1999999a) >> 32; | |
163 | *buf++ = (q - 10 * r) + '0'; /* 3 */ | |
164 | q = (r * (uint64_t)0x1999999a) >> 32; | |
165 | *buf++ = (r - 10 * q) + '0'; /* 4 */ | |
166 | r = (q * (uint64_t)0x1999999a) >> 32; | |
167 | *buf++ = (q - 10 * r) + '0'; /* 5 */ | |
168 | /* Now value is under 10000, can avoid 64-bit multiply */ | |
169 | q = (r * 0x199a) >> 16; | |
170 | *buf++ = (r - 10 * q) + '0'; /* 6 */ | |
171 | r = (q * 0xcd) >> 11; | |
172 | *buf++ = (q - 10 * r) + '0'; /* 7 */ | |
173 | q = (r * 0xcd) >> 11; | |
174 | *buf++ = (r - 10 * q) + '0'; /* 8 */ | |
175 | *buf++ = q + '0'; /* 9 */ | |
4277eedd DV |
176 | return buf; |
177 | } | |
133fd9f5 DV |
178 | #endif |
179 | ||
180 | /* Similar to above but do not pad with zeros. | |
181 | * Code can be easily arranged to print 9 digits too, but our callers | |
182 | * always call put_dec_full9() instead when the number has 9 decimal digits. | |
183 | */ | |
cf3b429b | 184 | static noinline_for_stack |
133fd9f5 | 185 | char *put_dec_trunc8(char *buf, unsigned r) |
4277eedd | 186 | { |
133fd9f5 DV |
187 | unsigned q; |
188 | ||
189 | /* Copy of previous function's body with added early returns */ | |
cb239d0a GS |
190 | while (r >= 10000) { |
191 | q = r + '0'; | |
192 | r = (r * (uint64_t)0x1999999a) >> 32; | |
193 | *buf++ = q - 10*r; | |
194 | } | |
195 | ||
f4000516 GS |
196 | q = (r * 0x199a) >> 16; /* r <= 9999 */ |
197 | *buf++ = (r - 10 * q) + '0'; | |
133fd9f5 DV |
198 | if (q == 0) |
199 | return buf; | |
f4000516 GS |
200 | r = (q * 0xcd) >> 11; /* q <= 999 */ |
201 | *buf++ = (q - 10 * r) + '0'; | |
133fd9f5 DV |
202 | if (r == 0) |
203 | return buf; | |
f4000516 GS |
204 | q = (r * 0xcd) >> 11; /* r <= 99 */ |
205 | *buf++ = (r - 10 * q) + '0'; | |
133fd9f5 DV |
206 | if (q == 0) |
207 | return buf; | |
f4000516 | 208 | *buf++ = q + '0'; /* q <= 9 */ |
133fd9f5 DV |
209 | return buf; |
210 | } | |
4277eedd | 211 | |
133fd9f5 DV |
212 | /* There are two algorithms to print larger numbers. |
213 | * One is generic: divide by 1000000000 and repeatedly print | |
214 | * groups of (up to) 9 digits. It's conceptually simple, | |
215 | * but requires a (unsigned long long) / 1000000000 division. | |
216 | * | |
217 | * Second algorithm splits 64-bit unsigned long long into 16-bit chunks, | |
218 | * manipulates them cleverly and generates groups of 4 decimal digits. | |
219 | * It so happens that it does NOT require long long division. | |
220 | * | |
221 | * If long is > 32 bits, division of 64-bit values is relatively easy, | |
222 | * and we will use the first algorithm. | |
223 | * If long long is > 64 bits (strange architecture with VERY large long long), | |
224 | * second algorithm can't be used, and we again use the first one. | |
225 | * | |
226 | * Else (if long is 32 bits and long long is 64 bits) we use second one. | |
227 | */ | |
7b9186f5 | 228 | |
133fd9f5 DV |
229 | #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64 |
230 | ||
231 | /* First algorithm: generic */ | |
232 | ||
233 | static | |
234 | char *put_dec(char *buf, unsigned long long n) | |
235 | { | |
236 | if (n >= 100*1000*1000) { | |
237 | while (n >= 1000*1000*1000) | |
238 | buf = put_dec_full9(buf, do_div(n, 1000*1000*1000)); | |
239 | if (n >= 100*1000*1000) | |
240 | return put_dec_full9(buf, n); | |
241 | } | |
242 | return put_dec_trunc8(buf, n); | |
4277eedd | 243 | } |
133fd9f5 DV |
244 | |
245 | #else | |
246 | ||
247 | /* Second algorithm: valid only for 64-bit long longs */ | |
248 | ||
e49317d4 | 249 | /* See comment in put_dec_full9 for choice of constants */ |
cf3b429b | 250 | static noinline_for_stack |
2359172a | 251 | void put_dec_full4(char *buf, unsigned q) |
4277eedd | 252 | { |
133fd9f5 | 253 | unsigned r; |
e49317d4 | 254 | r = (q * 0xccd) >> 15; |
2359172a | 255 | buf[0] = (q - 10 * r) + '0'; |
e49317d4 | 256 | q = (r * 0xcd) >> 11; |
2359172a | 257 | buf[1] = (r - 10 * q) + '0'; |
133fd9f5 | 258 | r = (q * 0xcd) >> 11; |
2359172a GS |
259 | buf[2] = (q - 10 * r) + '0'; |
260 | buf[3] = r + '0'; | |
261 | } | |
262 | ||
263 | /* | |
264 | * Call put_dec_full4 on x % 10000, return x / 10000. | |
265 | * The approximation x/10000 == (x * 0x346DC5D7) >> 43 | |
266 | * holds for all x < 1,128,869,999. The largest value this | |
267 | * helper will ever be asked to convert is 1,125,520,955. | |
268 | * (d1 in the put_dec code, assuming n is all-ones). | |
269 | */ | |
270 | static | |
271 | unsigned put_dec_helper4(char *buf, unsigned x) | |
272 | { | |
273 | uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43; | |
274 | ||
275 | put_dec_full4(buf, x - q * 10000); | |
276 | return q; | |
4277eedd DV |
277 | } |
278 | ||
133fd9f5 DV |
279 | /* Based on code by Douglas W. Jones found at |
280 | * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour> | |
281 | * (with permission from the author). | |
282 | * Performs no 64-bit division and hence should be fast on 32-bit machines. | |
283 | */ | |
284 | static | |
285 | char *put_dec(char *buf, unsigned long long n) | |
286 | { | |
287 | uint32_t d3, d2, d1, q, h; | |
288 | ||
289 | if (n < 100*1000*1000) | |
290 | return put_dec_trunc8(buf, n); | |
291 | ||
292 | d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */ | |
293 | h = (n >> 32); | |
294 | d2 = (h ) & 0xffff; | |
295 | d3 = (h >> 16); /* implicit "& 0xffff" */ | |
296 | ||
297 | q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff); | |
2359172a GS |
298 | q = put_dec_helper4(buf, q); |
299 | ||
300 | q += 7671 * d3 + 9496 * d2 + 6 * d1; | |
301 | q = put_dec_helper4(buf+4, q); | |
302 | ||
303 | q += 4749 * d3 + 42 * d2; | |
304 | q = put_dec_helper4(buf+8, q); | |
133fd9f5 | 305 | |
2359172a GS |
306 | q += 281 * d3; |
307 | buf += 12; | |
308 | if (q) | |
309 | buf = put_dec_trunc8(buf, q); | |
310 | else while (buf[-1] == '0') | |
133fd9f5 DV |
311 | --buf; |
312 | ||
313 | return buf; | |
314 | } | |
315 | ||
316 | #endif | |
317 | ||
1ac101a5 KH |
318 | /* |
319 | * Convert passed number to decimal string. | |
320 | * Returns the length of string. On buffer overflow, returns 0. | |
321 | * | |
322 | * If speed is not important, use snprintf(). It's easy to read the code. | |
323 | */ | |
324 | int num_to_str(char *buf, int size, unsigned long long num) | |
325 | { | |
133fd9f5 | 326 | char tmp[sizeof(num) * 3]; |
1ac101a5 KH |
327 | int idx, len; |
328 | ||
133fd9f5 DV |
329 | /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */ |
330 | if (num <= 9) { | |
331 | tmp[0] = '0' + num; | |
332 | len = 1; | |
333 | } else { | |
334 | len = put_dec(tmp, num) - tmp; | |
335 | } | |
1ac101a5 KH |
336 | |
337 | if (len > size) | |
338 | return 0; | |
339 | for (idx = 0; idx < len; ++idx) | |
340 | buf[idx] = tmp[len - idx - 1]; | |
133fd9f5 | 341 | return len; |
1ac101a5 KH |
342 | } |
343 | ||
51be17df | 344 | #define SIGN 1 /* unsigned/signed, must be 1 */ |
d1c1b121 | 345 | #define LEFT 2 /* left justified */ |
1da177e4 LT |
346 | #define PLUS 4 /* show plus */ |
347 | #define SPACE 8 /* space if plus */ | |
d1c1b121 | 348 | #define ZEROPAD 16 /* pad with zero, must be 16 == '0' - ' ' */ |
b89dc5d6 BH |
349 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ |
350 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ | |
1da177e4 | 351 | |
fef20d9c FW |
352 | enum format_type { |
353 | FORMAT_TYPE_NONE, /* Just a string part */ | |
ed681a91 | 354 | FORMAT_TYPE_WIDTH, |
fef20d9c FW |
355 | FORMAT_TYPE_PRECISION, |
356 | FORMAT_TYPE_CHAR, | |
357 | FORMAT_TYPE_STR, | |
358 | FORMAT_TYPE_PTR, | |
359 | FORMAT_TYPE_PERCENT_CHAR, | |
360 | FORMAT_TYPE_INVALID, | |
361 | FORMAT_TYPE_LONG_LONG, | |
362 | FORMAT_TYPE_ULONG, | |
363 | FORMAT_TYPE_LONG, | |
a4e94ef0 Z |
364 | FORMAT_TYPE_UBYTE, |
365 | FORMAT_TYPE_BYTE, | |
fef20d9c FW |
366 | FORMAT_TYPE_USHORT, |
367 | FORMAT_TYPE_SHORT, | |
368 | FORMAT_TYPE_UINT, | |
369 | FORMAT_TYPE_INT, | |
fef20d9c FW |
370 | FORMAT_TYPE_SIZE_T, |
371 | FORMAT_TYPE_PTRDIFF | |
372 | }; | |
373 | ||
374 | struct printf_spec { | |
4e310fda | 375 | u8 type; /* format_type enum */ |
ef0658f3 | 376 | u8 flags; /* flags to number() */ |
4e310fda JP |
377 | u8 base; /* number base, 8, 10 or 16 only */ |
378 | u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */ | |
379 | s16 field_width; /* width of output field */ | |
380 | s16 precision; /* # of digits/chars */ | |
fef20d9c FW |
381 | }; |
382 | ||
cf3b429b JP |
383 | static noinline_for_stack |
384 | char *number(char *buf, char *end, unsigned long long num, | |
385 | struct printf_spec spec) | |
1da177e4 | 386 | { |
e26c12c7 | 387 | char tmp[3 * sizeof(num)]; |
9b706aee DV |
388 | char sign; |
389 | char locase; | |
fef20d9c | 390 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
1da177e4 | 391 | int i; |
7c203422 | 392 | bool is_zero = num == 0LL; |
1da177e4 | 393 | |
9b706aee DV |
394 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
395 | * produces same digits or (maybe lowercased) letters */ | |
fef20d9c FW |
396 | locase = (spec.flags & SMALL); |
397 | if (spec.flags & LEFT) | |
398 | spec.flags &= ~ZEROPAD; | |
1da177e4 | 399 | sign = 0; |
fef20d9c | 400 | if (spec.flags & SIGN) { |
7b9186f5 | 401 | if ((signed long long)num < 0) { |
1da177e4 | 402 | sign = '-'; |
7b9186f5 | 403 | num = -(signed long long)num; |
fef20d9c FW |
404 | spec.field_width--; |
405 | } else if (spec.flags & PLUS) { | |
1da177e4 | 406 | sign = '+'; |
fef20d9c FW |
407 | spec.field_width--; |
408 | } else if (spec.flags & SPACE) { | |
1da177e4 | 409 | sign = ' '; |
fef20d9c | 410 | spec.field_width--; |
1da177e4 LT |
411 | } |
412 | } | |
b39a7340 | 413 | if (need_pfx) { |
fef20d9c | 414 | if (spec.base == 16) |
7c203422 PC |
415 | spec.field_width -= 2; |
416 | else if (!is_zero) | |
fef20d9c | 417 | spec.field_width--; |
1da177e4 | 418 | } |
b39a7340 DV |
419 | |
420 | /* generate full string in tmp[], in reverse order */ | |
1da177e4 | 421 | i = 0; |
133fd9f5 | 422 | if (num < spec.base) |
3ea8d440 | 423 | tmp[i++] = hex_asc_upper[num] | locase; |
fef20d9c FW |
424 | else if (spec.base != 10) { /* 8 or 16 */ |
425 | int mask = spec.base - 1; | |
b39a7340 | 426 | int shift = 3; |
7b9186f5 AGR |
427 | |
428 | if (spec.base == 16) | |
429 | shift = 4; | |
b39a7340 | 430 | do { |
3ea8d440 | 431 | tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase); |
b39a7340 DV |
432 | num >>= shift; |
433 | } while (num); | |
4277eedd DV |
434 | } else { /* base 10 */ |
435 | i = put_dec(tmp, num) - tmp; | |
436 | } | |
b39a7340 DV |
437 | |
438 | /* printing 100 using %2d gives "100", not "00" */ | |
fef20d9c FW |
439 | if (i > spec.precision) |
440 | spec.precision = i; | |
b39a7340 | 441 | /* leading space padding */ |
fef20d9c | 442 | spec.field_width -= spec.precision; |
51be17df | 443 | if (!(spec.flags & (ZEROPAD | LEFT))) { |
7b9186f5 | 444 | while (--spec.field_width >= 0) { |
f796937a | 445 | if (buf < end) |
1da177e4 LT |
446 | *buf = ' '; |
447 | ++buf; | |
448 | } | |
449 | } | |
b39a7340 | 450 | /* sign */ |
1da177e4 | 451 | if (sign) { |
f796937a | 452 | if (buf < end) |
1da177e4 LT |
453 | *buf = sign; |
454 | ++buf; | |
455 | } | |
b39a7340 DV |
456 | /* "0x" / "0" prefix */ |
457 | if (need_pfx) { | |
7c203422 PC |
458 | if (spec.base == 16 || !is_zero) { |
459 | if (buf < end) | |
460 | *buf = '0'; | |
461 | ++buf; | |
462 | } | |
fef20d9c | 463 | if (spec.base == 16) { |
f796937a | 464 | if (buf < end) |
9b706aee | 465 | *buf = ('X' | locase); |
1da177e4 LT |
466 | ++buf; |
467 | } | |
468 | } | |
b39a7340 | 469 | /* zero or space padding */ |
fef20d9c | 470 | if (!(spec.flags & LEFT)) { |
d1c1b121 RV |
471 | char c = ' ' + (spec.flags & ZEROPAD); |
472 | BUILD_BUG_ON(' ' + ZEROPAD != '0'); | |
fef20d9c | 473 | while (--spec.field_width >= 0) { |
f796937a | 474 | if (buf < end) |
1da177e4 LT |
475 | *buf = c; |
476 | ++buf; | |
477 | } | |
478 | } | |
b39a7340 | 479 | /* hmm even more zero padding? */ |
fef20d9c | 480 | while (i <= --spec.precision) { |
f796937a | 481 | if (buf < end) |
1da177e4 LT |
482 | *buf = '0'; |
483 | ++buf; | |
484 | } | |
b39a7340 DV |
485 | /* actual digits of result */ |
486 | while (--i >= 0) { | |
f796937a | 487 | if (buf < end) |
1da177e4 LT |
488 | *buf = tmp[i]; |
489 | ++buf; | |
490 | } | |
b39a7340 | 491 | /* trailing space padding */ |
fef20d9c | 492 | while (--spec.field_width >= 0) { |
f796937a | 493 | if (buf < end) |
1da177e4 LT |
494 | *buf = ' '; |
495 | ++buf; | |
496 | } | |
7b9186f5 | 497 | |
1da177e4 LT |
498 | return buf; |
499 | } | |
500 | ||
cf3b429b JP |
501 | static noinline_for_stack |
502 | char *string(char *buf, char *end, const char *s, struct printf_spec spec) | |
0f9bfa56 LT |
503 | { |
504 | int len, i; | |
505 | ||
506 | if ((unsigned long)s < PAGE_SIZE) | |
0f4f81dc | 507 | s = "(null)"; |
0f9bfa56 | 508 | |
fef20d9c | 509 | len = strnlen(s, spec.precision); |
0f9bfa56 | 510 | |
fef20d9c FW |
511 | if (!(spec.flags & LEFT)) { |
512 | while (len < spec.field_width--) { | |
0f9bfa56 LT |
513 | if (buf < end) |
514 | *buf = ' '; | |
515 | ++buf; | |
516 | } | |
517 | } | |
518 | for (i = 0; i < len; ++i) { | |
519 | if (buf < end) | |
520 | *buf = *s; | |
521 | ++buf; ++s; | |
522 | } | |
fef20d9c | 523 | while (len < spec.field_width--) { |
0f9bfa56 LT |
524 | if (buf < end) |
525 | *buf = ' '; | |
526 | ++buf; | |
527 | } | |
7b9186f5 | 528 | |
0f9bfa56 LT |
529 | return buf; |
530 | } | |
531 | ||
4b6ccca7 AV |
532 | static void widen(char *buf, char *end, unsigned len, unsigned spaces) |
533 | { | |
534 | size_t size; | |
535 | if (buf >= end) /* nowhere to put anything */ | |
536 | return; | |
537 | size = end - buf; | |
538 | if (size <= spaces) { | |
539 | memset(buf, ' ', size); | |
540 | return; | |
541 | } | |
542 | if (len) { | |
543 | if (len > size - spaces) | |
544 | len = size - spaces; | |
545 | memmove(buf + spaces, buf, len); | |
546 | } | |
547 | memset(buf, ' ', spaces); | |
548 | } | |
549 | ||
550 | static noinline_for_stack | |
551 | char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec, | |
552 | const char *fmt) | |
553 | { | |
554 | const char *array[4], *s; | |
555 | const struct dentry *p; | |
556 | int depth; | |
557 | int i, n; | |
558 | ||
559 | switch (fmt[1]) { | |
560 | case '2': case '3': case '4': | |
561 | depth = fmt[1] - '0'; | |
562 | break; | |
563 | default: | |
564 | depth = 1; | |
565 | } | |
566 | ||
567 | rcu_read_lock(); | |
568 | for (i = 0; i < depth; i++, d = p) { | |
569 | p = ACCESS_ONCE(d->d_parent); | |
570 | array[i] = ACCESS_ONCE(d->d_name.name); | |
571 | if (p == d) { | |
572 | if (i) | |
573 | array[i] = ""; | |
574 | i++; | |
575 | break; | |
576 | } | |
577 | } | |
578 | s = array[--i]; | |
579 | for (n = 0; n != spec.precision; n++, buf++) { | |
580 | char c = *s++; | |
581 | if (!c) { | |
582 | if (!i) | |
583 | break; | |
584 | c = '/'; | |
585 | s = array[--i]; | |
586 | } | |
587 | if (buf < end) | |
588 | *buf = c; | |
589 | } | |
590 | rcu_read_unlock(); | |
591 | if (n < spec.field_width) { | |
592 | /* we want to pad the sucker */ | |
593 | unsigned spaces = spec.field_width - n; | |
594 | if (!(spec.flags & LEFT)) { | |
595 | widen(buf - n, end, n, spaces); | |
596 | return buf + spaces; | |
597 | } | |
598 | while (spaces--) { | |
599 | if (buf < end) | |
600 | *buf = ' '; | |
601 | ++buf; | |
602 | } | |
603 | } | |
604 | return buf; | |
605 | } | |
606 | ||
cf3b429b JP |
607 | static noinline_for_stack |
608 | char *symbol_string(char *buf, char *end, void *ptr, | |
b0d33c2b | 609 | struct printf_spec spec, const char *fmt) |
0fe1ef24 | 610 | { |
b0d33c2b | 611 | unsigned long value; |
0fe1ef24 LT |
612 | #ifdef CONFIG_KALLSYMS |
613 | char sym[KSYM_SYMBOL_LEN]; | |
b0d33c2b JP |
614 | #endif |
615 | ||
616 | if (fmt[1] == 'R') | |
617 | ptr = __builtin_extract_return_addr(ptr); | |
618 | value = (unsigned long)ptr; | |
619 | ||
620 | #ifdef CONFIG_KALLSYMS | |
621 | if (*fmt == 'B') | |
0f77a8d3 | 622 | sprint_backtrace(sym, value); |
b0d33c2b | 623 | else if (*fmt != 'f' && *fmt != 's') |
0c8b946e FW |
624 | sprint_symbol(sym, value); |
625 | else | |
4796dd20 | 626 | sprint_symbol_no_offset(sym, value); |
7b9186f5 | 627 | |
fef20d9c | 628 | return string(buf, end, sym, spec); |
0fe1ef24 | 629 | #else |
7b9186f5 | 630 | spec.field_width = 2 * sizeof(void *); |
fef20d9c FW |
631 | spec.flags |= SPECIAL | SMALL | ZEROPAD; |
632 | spec.base = 16; | |
7b9186f5 | 633 | |
fef20d9c | 634 | return number(buf, end, value, spec); |
0fe1ef24 LT |
635 | #endif |
636 | } | |
637 | ||
cf3b429b JP |
638 | static noinline_for_stack |
639 | char *resource_string(char *buf, char *end, struct resource *res, | |
640 | struct printf_spec spec, const char *fmt) | |
332d2e78 LT |
641 | { |
642 | #ifndef IO_RSRC_PRINTK_SIZE | |
28405372 | 643 | #define IO_RSRC_PRINTK_SIZE 6 |
332d2e78 LT |
644 | #endif |
645 | ||
646 | #ifndef MEM_RSRC_PRINTK_SIZE | |
28405372 | 647 | #define MEM_RSRC_PRINTK_SIZE 10 |
332d2e78 | 648 | #endif |
4da0b66c | 649 | static const struct printf_spec io_spec = { |
fef20d9c | 650 | .base = 16, |
4da0b66c | 651 | .field_width = IO_RSRC_PRINTK_SIZE, |
fef20d9c FW |
652 | .precision = -1, |
653 | .flags = SPECIAL | SMALL | ZEROPAD, | |
654 | }; | |
4da0b66c BH |
655 | static const struct printf_spec mem_spec = { |
656 | .base = 16, | |
657 | .field_width = MEM_RSRC_PRINTK_SIZE, | |
658 | .precision = -1, | |
659 | .flags = SPECIAL | SMALL | ZEROPAD, | |
660 | }; | |
0f4050c7 BH |
661 | static const struct printf_spec bus_spec = { |
662 | .base = 16, | |
663 | .field_width = 2, | |
664 | .precision = -1, | |
665 | .flags = SMALL | ZEROPAD, | |
666 | }; | |
4da0b66c | 667 | static const struct printf_spec dec_spec = { |
c91d3376 BH |
668 | .base = 10, |
669 | .precision = -1, | |
670 | .flags = 0, | |
671 | }; | |
4da0b66c | 672 | static const struct printf_spec str_spec = { |
fd95541e BH |
673 | .field_width = -1, |
674 | .precision = 10, | |
675 | .flags = LEFT, | |
676 | }; | |
4da0b66c | 677 | static const struct printf_spec flag_spec = { |
fd95541e BH |
678 | .base = 16, |
679 | .precision = -1, | |
680 | .flags = SPECIAL | SMALL, | |
681 | }; | |
c7dabef8 BH |
682 | |
683 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) | |
684 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ | |
685 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) | |
686 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) | |
9d7cca04 | 687 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") |
c7dabef8 BH |
688 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") |
689 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, | |
690 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; | |
691 | ||
332d2e78 | 692 | char *p = sym, *pend = sym + sizeof(sym); |
c7dabef8 | 693 | int decode = (fmt[0] == 'R') ? 1 : 0; |
4da0b66c | 694 | const struct printf_spec *specp; |
332d2e78 LT |
695 | |
696 | *p++ = '['; | |
4da0b66c | 697 | if (res->flags & IORESOURCE_IO) { |
c7dabef8 | 698 | p = string(p, pend, "io ", str_spec); |
4da0b66c BH |
699 | specp = &io_spec; |
700 | } else if (res->flags & IORESOURCE_MEM) { | |
c7dabef8 | 701 | p = string(p, pend, "mem ", str_spec); |
4da0b66c BH |
702 | specp = &mem_spec; |
703 | } else if (res->flags & IORESOURCE_IRQ) { | |
c7dabef8 | 704 | p = string(p, pend, "irq ", str_spec); |
4da0b66c BH |
705 | specp = &dec_spec; |
706 | } else if (res->flags & IORESOURCE_DMA) { | |
c7dabef8 | 707 | p = string(p, pend, "dma ", str_spec); |
4da0b66c | 708 | specp = &dec_spec; |
0f4050c7 BH |
709 | } else if (res->flags & IORESOURCE_BUS) { |
710 | p = string(p, pend, "bus ", str_spec); | |
711 | specp = &bus_spec; | |
4da0b66c | 712 | } else { |
c7dabef8 | 713 | p = string(p, pend, "??? ", str_spec); |
4da0b66c | 714 | specp = &mem_spec; |
c7dabef8 | 715 | decode = 0; |
fd95541e | 716 | } |
d19cb803 BH |
717 | if (decode && res->flags & IORESOURCE_UNSET) { |
718 | p = string(p, pend, "size ", str_spec); | |
719 | p = number(p, pend, resource_size(res), *specp); | |
720 | } else { | |
721 | p = number(p, pend, res->start, *specp); | |
722 | if (res->start != res->end) { | |
723 | *p++ = '-'; | |
724 | p = number(p, pend, res->end, *specp); | |
725 | } | |
c91d3376 | 726 | } |
c7dabef8 | 727 | if (decode) { |
fd95541e BH |
728 | if (res->flags & IORESOURCE_MEM_64) |
729 | p = string(p, pend, " 64bit", str_spec); | |
730 | if (res->flags & IORESOURCE_PREFETCH) | |
731 | p = string(p, pend, " pref", str_spec); | |
9d7cca04 BH |
732 | if (res->flags & IORESOURCE_WINDOW) |
733 | p = string(p, pend, " window", str_spec); | |
fd95541e BH |
734 | if (res->flags & IORESOURCE_DISABLED) |
735 | p = string(p, pend, " disabled", str_spec); | |
c7dabef8 BH |
736 | } else { |
737 | p = string(p, pend, " flags ", str_spec); | |
738 | p = number(p, pend, res->flags, flag_spec); | |
fd95541e | 739 | } |
332d2e78 | 740 | *p++ = ']'; |
c7dabef8 | 741 | *p = '\0'; |
332d2e78 | 742 | |
fef20d9c | 743 | return string(buf, end, sym, spec); |
332d2e78 LT |
744 | } |
745 | ||
31550a16 AS |
746 | static noinline_for_stack |
747 | char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
748 | const char *fmt) | |
749 | { | |
360603a1 | 750 | int i, len = 1; /* if we pass '%ph[CDN]', field width remains |
31550a16 AS |
751 | negative value, fallback to the default */ |
752 | char separator; | |
753 | ||
754 | if (spec.field_width == 0) | |
755 | /* nothing to print */ | |
756 | return buf; | |
757 | ||
758 | if (ZERO_OR_NULL_PTR(addr)) | |
759 | /* NULL pointer */ | |
760 | return string(buf, end, NULL, spec); | |
761 | ||
762 | switch (fmt[1]) { | |
763 | case 'C': | |
764 | separator = ':'; | |
765 | break; | |
766 | case 'D': | |
767 | separator = '-'; | |
768 | break; | |
769 | case 'N': | |
770 | separator = 0; | |
771 | break; | |
772 | default: | |
773 | separator = ' '; | |
774 | break; | |
775 | } | |
776 | ||
777 | if (spec.field_width > 0) | |
778 | len = min_t(int, spec.field_width, 64); | |
779 | ||
780 | for (i = 0; i < len && buf < end - 1; i++) { | |
781 | buf = hex_byte_pack(buf, addr[i]); | |
782 | ||
783 | if (buf < end && separator && i != len - 1) | |
784 | *buf++ = separator; | |
785 | } | |
786 | ||
787 | return buf; | |
788 | } | |
789 | ||
dbc760bc TH |
790 | static noinline_for_stack |
791 | char *bitmap_string(char *buf, char *end, unsigned long *bitmap, | |
792 | struct printf_spec spec, const char *fmt) | |
793 | { | |
794 | const int CHUNKSZ = 32; | |
795 | int nr_bits = max_t(int, spec.field_width, 0); | |
796 | int i, chunksz; | |
797 | bool first = true; | |
798 | ||
799 | /* reused to print numbers */ | |
800 | spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 }; | |
801 | ||
802 | chunksz = nr_bits & (CHUNKSZ - 1); | |
803 | if (chunksz == 0) | |
804 | chunksz = CHUNKSZ; | |
805 | ||
806 | i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ; | |
807 | for (; i >= 0; i -= CHUNKSZ) { | |
808 | u32 chunkmask, val; | |
809 | int word, bit; | |
810 | ||
811 | chunkmask = ((1ULL << chunksz) - 1); | |
812 | word = i / BITS_PER_LONG; | |
813 | bit = i % BITS_PER_LONG; | |
814 | val = (bitmap[word] >> bit) & chunkmask; | |
815 | ||
816 | if (!first) { | |
817 | if (buf < end) | |
818 | *buf = ','; | |
819 | buf++; | |
820 | } | |
821 | first = false; | |
822 | ||
823 | spec.field_width = DIV_ROUND_UP(chunksz, 4); | |
824 | buf = number(buf, end, val, spec); | |
825 | ||
826 | chunksz = CHUNKSZ; | |
827 | } | |
828 | return buf; | |
829 | } | |
830 | ||
831 | static noinline_for_stack | |
832 | char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap, | |
833 | struct printf_spec spec, const char *fmt) | |
834 | { | |
835 | int nr_bits = max_t(int, spec.field_width, 0); | |
836 | /* current bit is 'cur', most recently seen range is [rbot, rtop] */ | |
837 | int cur, rbot, rtop; | |
838 | bool first = true; | |
839 | ||
840 | /* reused to print numbers */ | |
841 | spec = (struct printf_spec){ .base = 10 }; | |
842 | ||
843 | rbot = cur = find_first_bit(bitmap, nr_bits); | |
844 | while (cur < nr_bits) { | |
845 | rtop = cur; | |
846 | cur = find_next_bit(bitmap, nr_bits, cur + 1); | |
847 | if (cur < nr_bits && cur <= rtop + 1) | |
848 | continue; | |
849 | ||
850 | if (!first) { | |
851 | if (buf < end) | |
852 | *buf = ','; | |
853 | buf++; | |
854 | } | |
855 | first = false; | |
856 | ||
857 | buf = number(buf, end, rbot, spec); | |
858 | if (rbot < rtop) { | |
859 | if (buf < end) | |
860 | *buf = '-'; | |
861 | buf++; | |
862 | ||
863 | buf = number(buf, end, rtop, spec); | |
864 | } | |
865 | ||
866 | rbot = cur; | |
867 | } | |
868 | return buf; | |
869 | } | |
870 | ||
cf3b429b JP |
871 | static noinline_for_stack |
872 | char *mac_address_string(char *buf, char *end, u8 *addr, | |
873 | struct printf_spec spec, const char *fmt) | |
dd45c9cf | 874 | { |
8a27f7c9 | 875 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; |
dd45c9cf HH |
876 | char *p = mac_addr; |
877 | int i; | |
bc7259a2 | 878 | char separator; |
76597ff9 | 879 | bool reversed = false; |
bc7259a2 | 880 | |
76597ff9 AE |
881 | switch (fmt[1]) { |
882 | case 'F': | |
bc7259a2 | 883 | separator = '-'; |
76597ff9 AE |
884 | break; |
885 | ||
886 | case 'R': | |
887 | reversed = true; | |
888 | /* fall through */ | |
889 | ||
890 | default: | |
bc7259a2 | 891 | separator = ':'; |
76597ff9 | 892 | break; |
bc7259a2 | 893 | } |
dd45c9cf HH |
894 | |
895 | for (i = 0; i < 6; i++) { | |
76597ff9 AE |
896 | if (reversed) |
897 | p = hex_byte_pack(p, addr[5 - i]); | |
898 | else | |
899 | p = hex_byte_pack(p, addr[i]); | |
900 | ||
8a27f7c9 | 901 | if (fmt[0] == 'M' && i != 5) |
bc7259a2 | 902 | *p++ = separator; |
dd45c9cf HH |
903 | } |
904 | *p = '\0'; | |
905 | ||
fef20d9c | 906 | return string(buf, end, mac_addr, spec); |
dd45c9cf HH |
907 | } |
908 | ||
cf3b429b JP |
909 | static noinline_for_stack |
910 | char *ip4_string(char *p, const u8 *addr, const char *fmt) | |
8a27f7c9 JP |
911 | { |
912 | int i; | |
0159f24e JP |
913 | bool leading_zeros = (fmt[0] == 'i'); |
914 | int index; | |
915 | int step; | |
916 | ||
917 | switch (fmt[2]) { | |
918 | case 'h': | |
919 | #ifdef __BIG_ENDIAN | |
920 | index = 0; | |
921 | step = 1; | |
922 | #else | |
923 | index = 3; | |
924 | step = -1; | |
925 | #endif | |
926 | break; | |
927 | case 'l': | |
928 | index = 3; | |
929 | step = -1; | |
930 | break; | |
931 | case 'n': | |
932 | case 'b': | |
933 | default: | |
934 | index = 0; | |
935 | step = 1; | |
936 | break; | |
937 | } | |
8a27f7c9 JP |
938 | for (i = 0; i < 4; i++) { |
939 | char temp[3]; /* hold each IP quad in reverse order */ | |
133fd9f5 | 940 | int digits = put_dec_trunc8(temp, addr[index]) - temp; |
8a27f7c9 JP |
941 | if (leading_zeros) { |
942 | if (digits < 3) | |
943 | *p++ = '0'; | |
944 | if (digits < 2) | |
945 | *p++ = '0'; | |
946 | } | |
947 | /* reverse the digits in the quad */ | |
948 | while (digits--) | |
949 | *p++ = temp[digits]; | |
950 | if (i < 3) | |
951 | *p++ = '.'; | |
0159f24e | 952 | index += step; |
8a27f7c9 | 953 | } |
8a27f7c9 | 954 | *p = '\0'; |
7b9186f5 | 955 | |
8a27f7c9 JP |
956 | return p; |
957 | } | |
958 | ||
cf3b429b JP |
959 | static noinline_for_stack |
960 | char *ip6_compressed_string(char *p, const char *addr) | |
689afa7d | 961 | { |
7b9186f5 | 962 | int i, j, range; |
8a27f7c9 JP |
963 | unsigned char zerolength[8]; |
964 | int longest = 1; | |
965 | int colonpos = -1; | |
966 | u16 word; | |
7b9186f5 | 967 | u8 hi, lo; |
8a27f7c9 | 968 | bool needcolon = false; |
eb78cd26 JP |
969 | bool useIPv4; |
970 | struct in6_addr in6; | |
971 | ||
972 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
973 | ||
974 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
8a27f7c9 JP |
975 | |
976 | memset(zerolength, 0, sizeof(zerolength)); | |
977 | ||
978 | if (useIPv4) | |
979 | range = 6; | |
980 | else | |
981 | range = 8; | |
982 | ||
983 | /* find position of longest 0 run */ | |
984 | for (i = 0; i < range; i++) { | |
985 | for (j = i; j < range; j++) { | |
eb78cd26 | 986 | if (in6.s6_addr16[j] != 0) |
8a27f7c9 JP |
987 | break; |
988 | zerolength[i]++; | |
989 | } | |
990 | } | |
991 | for (i = 0; i < range; i++) { | |
992 | if (zerolength[i] > longest) { | |
993 | longest = zerolength[i]; | |
994 | colonpos = i; | |
995 | } | |
996 | } | |
29cf519e JP |
997 | if (longest == 1) /* don't compress a single 0 */ |
998 | colonpos = -1; | |
689afa7d | 999 | |
8a27f7c9 JP |
1000 | /* emit address */ |
1001 | for (i = 0; i < range; i++) { | |
1002 | if (i == colonpos) { | |
1003 | if (needcolon || i == 0) | |
1004 | *p++ = ':'; | |
1005 | *p++ = ':'; | |
1006 | needcolon = false; | |
1007 | i += longest - 1; | |
1008 | continue; | |
1009 | } | |
1010 | if (needcolon) { | |
1011 | *p++ = ':'; | |
1012 | needcolon = false; | |
1013 | } | |
1014 | /* hex u16 without leading 0s */ | |
eb78cd26 | 1015 | word = ntohs(in6.s6_addr16[i]); |
8a27f7c9 JP |
1016 | hi = word >> 8; |
1017 | lo = word & 0xff; | |
1018 | if (hi) { | |
1019 | if (hi > 0x0f) | |
55036ba7 | 1020 | p = hex_byte_pack(p, hi); |
8a27f7c9 JP |
1021 | else |
1022 | *p++ = hex_asc_lo(hi); | |
55036ba7 | 1023 | p = hex_byte_pack(p, lo); |
8a27f7c9 | 1024 | } |
b5ff992b | 1025 | else if (lo > 0x0f) |
55036ba7 | 1026 | p = hex_byte_pack(p, lo); |
8a27f7c9 JP |
1027 | else |
1028 | *p++ = hex_asc_lo(lo); | |
1029 | needcolon = true; | |
1030 | } | |
1031 | ||
1032 | if (useIPv4) { | |
1033 | if (needcolon) | |
1034 | *p++ = ':'; | |
0159f24e | 1035 | p = ip4_string(p, &in6.s6_addr[12], "I4"); |
8a27f7c9 | 1036 | } |
8a27f7c9 | 1037 | *p = '\0'; |
7b9186f5 | 1038 | |
8a27f7c9 JP |
1039 | return p; |
1040 | } | |
1041 | ||
cf3b429b JP |
1042 | static noinline_for_stack |
1043 | char *ip6_string(char *p, const char *addr, const char *fmt) | |
8a27f7c9 JP |
1044 | { |
1045 | int i; | |
7b9186f5 | 1046 | |
689afa7d | 1047 | for (i = 0; i < 8; i++) { |
55036ba7 AS |
1048 | p = hex_byte_pack(p, *addr++); |
1049 | p = hex_byte_pack(p, *addr++); | |
8a27f7c9 | 1050 | if (fmt[0] == 'I' && i != 7) |
689afa7d HH |
1051 | *p++ = ':'; |
1052 | } | |
1053 | *p = '\0'; | |
7b9186f5 | 1054 | |
8a27f7c9 JP |
1055 | return p; |
1056 | } | |
1057 | ||
cf3b429b JP |
1058 | static noinline_for_stack |
1059 | char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
1060 | struct printf_spec spec, const char *fmt) | |
8a27f7c9 JP |
1061 | { |
1062 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
1063 | ||
1064 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
eb78cd26 | 1065 | ip6_compressed_string(ip6_addr, addr); |
8a27f7c9 | 1066 | else |
eb78cd26 | 1067 | ip6_string(ip6_addr, addr, fmt); |
689afa7d | 1068 | |
fef20d9c | 1069 | return string(buf, end, ip6_addr, spec); |
689afa7d HH |
1070 | } |
1071 | ||
cf3b429b JP |
1072 | static noinline_for_stack |
1073 | char *ip4_addr_string(char *buf, char *end, const u8 *addr, | |
1074 | struct printf_spec spec, const char *fmt) | |
4aa99606 | 1075 | { |
8a27f7c9 | 1076 | char ip4_addr[sizeof("255.255.255.255")]; |
4aa99606 | 1077 | |
0159f24e | 1078 | ip4_string(ip4_addr, addr, fmt); |
4aa99606 | 1079 | |
fef20d9c | 1080 | return string(buf, end, ip4_addr, spec); |
4aa99606 HH |
1081 | } |
1082 | ||
10679643 DB |
1083 | static noinline_for_stack |
1084 | char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa, | |
1085 | struct printf_spec spec, const char *fmt) | |
1086 | { | |
1087 | bool have_p = false, have_s = false, have_f = false, have_c = false; | |
1088 | char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") + | |
1089 | sizeof(":12345") + sizeof("/123456789") + | |
1090 | sizeof("%1234567890")]; | |
1091 | char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr); | |
1092 | const u8 *addr = (const u8 *) &sa->sin6_addr; | |
1093 | char fmt6[2] = { fmt[0], '6' }; | |
1094 | u8 off = 0; | |
1095 | ||
1096 | fmt++; | |
1097 | while (isalpha(*++fmt)) { | |
1098 | switch (*fmt) { | |
1099 | case 'p': | |
1100 | have_p = true; | |
1101 | break; | |
1102 | case 'f': | |
1103 | have_f = true; | |
1104 | break; | |
1105 | case 's': | |
1106 | have_s = true; | |
1107 | break; | |
1108 | case 'c': | |
1109 | have_c = true; | |
1110 | break; | |
1111 | } | |
1112 | } | |
1113 | ||
1114 | if (have_p || have_s || have_f) { | |
1115 | *p = '['; | |
1116 | off = 1; | |
1117 | } | |
1118 | ||
1119 | if (fmt6[0] == 'I' && have_c) | |
1120 | p = ip6_compressed_string(ip6_addr + off, addr); | |
1121 | else | |
1122 | p = ip6_string(ip6_addr + off, addr, fmt6); | |
1123 | ||
1124 | if (have_p || have_s || have_f) | |
1125 | *p++ = ']'; | |
1126 | ||
1127 | if (have_p) { | |
1128 | *p++ = ':'; | |
1129 | p = number(p, pend, ntohs(sa->sin6_port), spec); | |
1130 | } | |
1131 | if (have_f) { | |
1132 | *p++ = '/'; | |
1133 | p = number(p, pend, ntohl(sa->sin6_flowinfo & | |
1134 | IPV6_FLOWINFO_MASK), spec); | |
1135 | } | |
1136 | if (have_s) { | |
1137 | *p++ = '%'; | |
1138 | p = number(p, pend, sa->sin6_scope_id, spec); | |
1139 | } | |
1140 | *p = '\0'; | |
1141 | ||
1142 | return string(buf, end, ip6_addr, spec); | |
1143 | } | |
1144 | ||
1145 | static noinline_for_stack | |
1146 | char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa, | |
1147 | struct printf_spec spec, const char *fmt) | |
1148 | { | |
1149 | bool have_p = false; | |
1150 | char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")]; | |
1151 | char *pend = ip4_addr + sizeof(ip4_addr); | |
1152 | const u8 *addr = (const u8 *) &sa->sin_addr.s_addr; | |
1153 | char fmt4[3] = { fmt[0], '4', 0 }; | |
1154 | ||
1155 | fmt++; | |
1156 | while (isalpha(*++fmt)) { | |
1157 | switch (*fmt) { | |
1158 | case 'p': | |
1159 | have_p = true; | |
1160 | break; | |
1161 | case 'h': | |
1162 | case 'l': | |
1163 | case 'n': | |
1164 | case 'b': | |
1165 | fmt4[2] = *fmt; | |
1166 | break; | |
1167 | } | |
1168 | } | |
1169 | ||
1170 | p = ip4_string(ip4_addr, addr, fmt4); | |
1171 | if (have_p) { | |
1172 | *p++ = ':'; | |
1173 | p = number(p, pend, ntohs(sa->sin_port), spec); | |
1174 | } | |
1175 | *p = '\0'; | |
1176 | ||
1177 | return string(buf, end, ip4_addr, spec); | |
1178 | } | |
1179 | ||
71dca95d AS |
1180 | static noinline_for_stack |
1181 | char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
1182 | const char *fmt) | |
1183 | { | |
1184 | bool found = true; | |
1185 | int count = 1; | |
1186 | unsigned int flags = 0; | |
1187 | int len; | |
1188 | ||
1189 | if (spec.field_width == 0) | |
1190 | return buf; /* nothing to print */ | |
1191 | ||
1192 | if (ZERO_OR_NULL_PTR(addr)) | |
1193 | return string(buf, end, NULL, spec); /* NULL pointer */ | |
1194 | ||
1195 | ||
1196 | do { | |
1197 | switch (fmt[count++]) { | |
1198 | case 'a': | |
1199 | flags |= ESCAPE_ANY; | |
1200 | break; | |
1201 | case 'c': | |
1202 | flags |= ESCAPE_SPECIAL; | |
1203 | break; | |
1204 | case 'h': | |
1205 | flags |= ESCAPE_HEX; | |
1206 | break; | |
1207 | case 'n': | |
1208 | flags |= ESCAPE_NULL; | |
1209 | break; | |
1210 | case 'o': | |
1211 | flags |= ESCAPE_OCTAL; | |
1212 | break; | |
1213 | case 'p': | |
1214 | flags |= ESCAPE_NP; | |
1215 | break; | |
1216 | case 's': | |
1217 | flags |= ESCAPE_SPACE; | |
1218 | break; | |
1219 | default: | |
1220 | found = false; | |
1221 | break; | |
1222 | } | |
1223 | } while (found); | |
1224 | ||
1225 | if (!flags) | |
1226 | flags = ESCAPE_ANY_NP; | |
1227 | ||
1228 | len = spec.field_width < 0 ? 1 : spec.field_width; | |
1229 | ||
1230 | /* Ignore the error. We print as many characters as we can */ | |
1231 | string_escape_mem(addr, len, &buf, end - buf, flags, NULL); | |
1232 | ||
1233 | return buf; | |
1234 | } | |
1235 | ||
cf3b429b JP |
1236 | static noinline_for_stack |
1237 | char *uuid_string(char *buf, char *end, const u8 *addr, | |
1238 | struct printf_spec spec, const char *fmt) | |
9ac6e44e JP |
1239 | { |
1240 | char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; | |
1241 | char *p = uuid; | |
1242 | int i; | |
1243 | static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; | |
1244 | static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; | |
1245 | const u8 *index = be; | |
1246 | bool uc = false; | |
1247 | ||
1248 | switch (*(++fmt)) { | |
1249 | case 'L': | |
1250 | uc = true; /* fall-through */ | |
1251 | case 'l': | |
1252 | index = le; | |
1253 | break; | |
1254 | case 'B': | |
1255 | uc = true; | |
1256 | break; | |
1257 | } | |
1258 | ||
1259 | for (i = 0; i < 16; i++) { | |
55036ba7 | 1260 | p = hex_byte_pack(p, addr[index[i]]); |
9ac6e44e JP |
1261 | switch (i) { |
1262 | case 3: | |
1263 | case 5: | |
1264 | case 7: | |
1265 | case 9: | |
1266 | *p++ = '-'; | |
1267 | break; | |
1268 | } | |
1269 | } | |
1270 | ||
1271 | *p = 0; | |
1272 | ||
1273 | if (uc) { | |
1274 | p = uuid; | |
1275 | do { | |
1276 | *p = toupper(*p); | |
1277 | } while (*(++p)); | |
1278 | } | |
1279 | ||
1280 | return string(buf, end, uuid, spec); | |
1281 | } | |
1282 | ||
c8f44aff MM |
1283 | static |
1284 | char *netdev_feature_string(char *buf, char *end, const u8 *addr, | |
1285 | struct printf_spec spec) | |
1286 | { | |
1287 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
1288 | if (spec.field_width == -1) | |
1289 | spec.field_width = 2 + 2 * sizeof(netdev_features_t); | |
1290 | spec.base = 16; | |
1291 | ||
1292 | return number(buf, end, *(const netdev_features_t *)addr, spec); | |
1293 | } | |
1294 | ||
aaf07621 JP |
1295 | static noinline_for_stack |
1296 | char *address_val(char *buf, char *end, const void *addr, | |
1297 | struct printf_spec spec, const char *fmt) | |
1298 | { | |
1299 | unsigned long long num; | |
1300 | ||
1301 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
1302 | spec.base = 16; | |
1303 | ||
1304 | switch (fmt[1]) { | |
1305 | case 'd': | |
1306 | num = *(const dma_addr_t *)addr; | |
1307 | spec.field_width = sizeof(dma_addr_t) * 2 + 2; | |
1308 | break; | |
1309 | case 'p': | |
1310 | default: | |
1311 | num = *(const phys_addr_t *)addr; | |
1312 | spec.field_width = sizeof(phys_addr_t) * 2 + 2; | |
1313 | break; | |
1314 | } | |
1315 | ||
1316 | return number(buf, end, num, spec); | |
1317 | } | |
1318 | ||
900cca29 GU |
1319 | static noinline_for_stack |
1320 | char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec, | |
1321 | const char *fmt) | |
1322 | { | |
1323 | if (!IS_ENABLED(CONFIG_HAVE_CLK) || !clk) | |
1324 | return string(buf, end, NULL, spec); | |
1325 | ||
1326 | switch (fmt[1]) { | |
1327 | case 'r': | |
1328 | return number(buf, end, clk_get_rate(clk), spec); | |
1329 | ||
1330 | case 'n': | |
1331 | default: | |
1332 | #ifdef CONFIG_COMMON_CLK | |
1333 | return string(buf, end, __clk_get_name(clk), spec); | |
1334 | #else | |
1335 | spec.base = 16; | |
1336 | spec.field_width = sizeof(unsigned long) * 2 + 2; | |
1337 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
1338 | return number(buf, end, (unsigned long)clk, spec); | |
1339 | #endif | |
1340 | } | |
1341 | } | |
1342 | ||
411f05f1 | 1343 | int kptr_restrict __read_mostly; |
455cd5ab | 1344 | |
4d8a743c LT |
1345 | /* |
1346 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
1347 | * by an extra set of alphanumeric characters that are extended format | |
1348 | * specifiers. | |
1349 | * | |
332d2e78 LT |
1350 | * Right now we handle: |
1351 | * | |
0c8b946e FW |
1352 | * - 'F' For symbolic function descriptor pointers with offset |
1353 | * - 'f' For simple symbolic function names without offset | |
0efb4d20 SR |
1354 | * - 'S' For symbolic direct pointers with offset |
1355 | * - 's' For symbolic direct pointers without offset | |
b0d33c2b | 1356 | * - '[FfSs]R' as above with __builtin_extract_return_addr() translation |
0f77a8d3 | 1357 | * - 'B' For backtraced symbolic direct pointers with offset |
c7dabef8 BH |
1358 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] |
1359 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] | |
dbc760bc TH |
1360 | * - 'b[l]' For a bitmap, the number of bits is determined by the field |
1361 | * width which must be explicitly specified either as part of the | |
1362 | * format string '%32b[l]' or through '%*b[l]', [l] selects | |
1363 | * range-list format instead of hex format | |
dd45c9cf HH |
1364 | * - 'M' For a 6-byte MAC address, it prints the address in the |
1365 | * usual colon-separated hex notation | |
8a27f7c9 | 1366 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons |
bc7259a2 | 1367 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address |
c8e00060 | 1368 | * with a dash-separated hex notation |
7c59154e | 1369 | * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth) |
8a27f7c9 JP |
1370 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way |
1371 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
1372 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
10679643 DB |
1373 | * [S][pfs] |
1374 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1375 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
8a27f7c9 JP |
1376 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses |
1377 | * IPv6 omits the colons (01020304...0f) | |
1378 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
10679643 DB |
1379 | * [S][pfs] |
1380 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1381 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
1382 | * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order | |
1383 | * - 'I[6S]c' for IPv6 addresses printed as specified by | |
29cf519e | 1384 | * http://tools.ietf.org/html/rfc5952 |
71dca95d AS |
1385 | * - 'E[achnops]' For an escaped buffer, where rules are defined by combination |
1386 | * of the following flags (see string_escape_mem() for the | |
1387 | * details): | |
1388 | * a - ESCAPE_ANY | |
1389 | * c - ESCAPE_SPECIAL | |
1390 | * h - ESCAPE_HEX | |
1391 | * n - ESCAPE_NULL | |
1392 | * o - ESCAPE_OCTAL | |
1393 | * p - ESCAPE_NP | |
1394 | * s - ESCAPE_SPACE | |
1395 | * By default ESCAPE_ANY_NP is used. | |
9ac6e44e JP |
1396 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form |
1397 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" | |
1398 | * Options for %pU are: | |
1399 | * b big endian lower case hex (default) | |
1400 | * B big endian UPPER case hex | |
1401 | * l little endian lower case hex | |
1402 | * L little endian UPPER case hex | |
1403 | * big endian output byte order is: | |
1404 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] | |
1405 | * little endian output byte order is: | |
1406 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] | |
7db6f5fb JP |
1407 | * - 'V' For a struct va_format which contains a format string * and va_list *, |
1408 | * call vsnprintf(->format, *->va_list). | |
1409 | * Implements a "recursive vsnprintf". | |
1410 | * Do not use this feature without some mechanism to verify the | |
1411 | * correctness of the format string and va_list arguments. | |
455cd5ab | 1412 | * - 'K' For a kernel pointer that should be hidden from unprivileged users |
c8f44aff | 1413 | * - 'NF' For a netdev_features_t |
31550a16 AS |
1414 | * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with |
1415 | * a certain separator (' ' by default): | |
1416 | * C colon | |
1417 | * D dash | |
1418 | * N no separator | |
1419 | * The maximum supported length is 64 bytes of the input. Consider | |
1420 | * to use print_hex_dump() for the larger input. | |
aaf07621 JP |
1421 | * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives |
1422 | * (default assumed to be phys_addr_t, passed by reference) | |
c0d92a57 OJ |
1423 | * - 'd[234]' For a dentry name (optionally 2-4 last components) |
1424 | * - 'D[234]' Same as 'd' but for a struct file | |
900cca29 GU |
1425 | * - 'C' For a clock, it prints the name (Common Clock Framework) or address |
1426 | * (legacy clock framework) of the clock | |
1427 | * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address | |
1428 | * (legacy clock framework) of the clock | |
1429 | * - 'Cr' For a clock, it prints the current rate of the clock | |
9ac6e44e | 1430 | * |
332d2e78 LT |
1431 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 |
1432 | * function pointers are really function descriptors, which contain a | |
1433 | * pointer to the real address. | |
4d8a743c | 1434 | */ |
cf3b429b JP |
1435 | static noinline_for_stack |
1436 | char *pointer(const char *fmt, char *buf, char *end, void *ptr, | |
1437 | struct printf_spec spec) | |
78a8bf69 | 1438 | { |
725fe002 GL |
1439 | int default_width = 2 * sizeof(void *) + (spec.flags & SPECIAL ? 2 : 0); |
1440 | ||
9f36e2c4 | 1441 | if (!ptr && *fmt != 'K') { |
5e057981 JP |
1442 | /* |
1443 | * Print (null) with the same width as a pointer so it makes | |
1444 | * tabular output look nice. | |
1445 | */ | |
1446 | if (spec.field_width == -1) | |
725fe002 | 1447 | spec.field_width = default_width; |
fef20d9c | 1448 | return string(buf, end, "(null)", spec); |
5e057981 | 1449 | } |
d97106ab | 1450 | |
0fe1ef24 LT |
1451 | switch (*fmt) { |
1452 | case 'F': | |
0c8b946e | 1453 | case 'f': |
0fe1ef24 LT |
1454 | ptr = dereference_function_descriptor(ptr); |
1455 | /* Fallthrough */ | |
1456 | case 'S': | |
9ac6e44e | 1457 | case 's': |
0f77a8d3 | 1458 | case 'B': |
b0d33c2b | 1459 | return symbol_string(buf, end, ptr, spec, fmt); |
332d2e78 | 1460 | case 'R': |
c7dabef8 | 1461 | case 'r': |
fd95541e | 1462 | return resource_string(buf, end, ptr, spec, fmt); |
31550a16 AS |
1463 | case 'h': |
1464 | return hex_string(buf, end, ptr, spec, fmt); | |
dbc760bc TH |
1465 | case 'b': |
1466 | switch (fmt[1]) { | |
1467 | case 'l': | |
1468 | return bitmap_list_string(buf, end, ptr, spec, fmt); | |
1469 | default: | |
1470 | return bitmap_string(buf, end, ptr, spec, fmt); | |
1471 | } | |
8a27f7c9 JP |
1472 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
1473 | case 'm': /* Contiguous: 000102030405 */ | |
76597ff9 AE |
1474 | /* [mM]F (FDDI) */ |
1475 | /* [mM]R (Reverse order; Bluetooth) */ | |
8a27f7c9 JP |
1476 | return mac_address_string(buf, end, ptr, spec, fmt); |
1477 | case 'I': /* Formatted IP supported | |
1478 | * 4: 1.2.3.4 | |
1479 | * 6: 0001:0203:...:0708 | |
1480 | * 6c: 1::708 or 1::1.2.3.4 | |
1481 | */ | |
1482 | case 'i': /* Contiguous: | |
1483 | * 4: 001.002.003.004 | |
1484 | * 6: 000102...0f | |
1485 | */ | |
1486 | switch (fmt[1]) { | |
1487 | case '6': | |
1488 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
1489 | case '4': | |
1490 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
10679643 DB |
1491 | case 'S': { |
1492 | const union { | |
1493 | struct sockaddr raw; | |
1494 | struct sockaddr_in v4; | |
1495 | struct sockaddr_in6 v6; | |
1496 | } *sa = ptr; | |
1497 | ||
1498 | switch (sa->raw.sa_family) { | |
1499 | case AF_INET: | |
1500 | return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt); | |
1501 | case AF_INET6: | |
1502 | return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt); | |
1503 | default: | |
1504 | return string(buf, end, "(invalid address)", spec); | |
1505 | }} | |
8a27f7c9 | 1506 | } |
fef20d9c | 1507 | break; |
71dca95d AS |
1508 | case 'E': |
1509 | return escaped_string(buf, end, ptr, spec, fmt); | |
9ac6e44e JP |
1510 | case 'U': |
1511 | return uuid_string(buf, end, ptr, spec, fmt); | |
7db6f5fb | 1512 | case 'V': |
5756b76e JB |
1513 | { |
1514 | va_list va; | |
1515 | ||
1516 | va_copy(va, *((struct va_format *)ptr)->va); | |
1517 | buf += vsnprintf(buf, end > buf ? end - buf : 0, | |
1518 | ((struct va_format *)ptr)->fmt, va); | |
1519 | va_end(va); | |
1520 | return buf; | |
1521 | } | |
455cd5ab DR |
1522 | case 'K': |
1523 | /* | |
1524 | * %pK cannot be used in IRQ context because its test | |
1525 | * for CAP_SYSLOG would be meaningless. | |
1526 | */ | |
3715c530 DR |
1527 | if (kptr_restrict && (in_irq() || in_serving_softirq() || |
1528 | in_nmi())) { | |
455cd5ab | 1529 | if (spec.field_width == -1) |
725fe002 | 1530 | spec.field_width = default_width; |
455cd5ab | 1531 | return string(buf, end, "pK-error", spec); |
455cd5ab | 1532 | } |
312b4e22 RM |
1533 | |
1534 | switch (kptr_restrict) { | |
1535 | case 0: | |
1536 | /* Always print %pK values */ | |
1537 | break; | |
1538 | case 1: { | |
1539 | /* | |
1540 | * Only print the real pointer value if the current | |
1541 | * process has CAP_SYSLOG and is running with the | |
1542 | * same credentials it started with. This is because | |
1543 | * access to files is checked at open() time, but %pK | |
1544 | * checks permission at read() time. We don't want to | |
1545 | * leak pointer values if a binary opens a file using | |
1546 | * %pK and then elevates privileges before reading it. | |
1547 | */ | |
1548 | const struct cred *cred = current_cred(); | |
1549 | ||
1550 | if (!has_capability_noaudit(current, CAP_SYSLOG) || | |
1551 | !uid_eq(cred->euid, cred->uid) || | |
1552 | !gid_eq(cred->egid, cred->gid)) | |
1553 | ptr = NULL; | |
1554 | break; | |
1555 | } | |
1556 | case 2: | |
1557 | default: | |
1558 | /* Always print 0's for %pK */ | |
26297607 | 1559 | ptr = NULL; |
312b4e22 RM |
1560 | break; |
1561 | } | |
26297607 | 1562 | break; |
312b4e22 | 1563 | |
c8f44aff MM |
1564 | case 'N': |
1565 | switch (fmt[1]) { | |
1566 | case 'F': | |
1567 | return netdev_feature_string(buf, end, ptr, spec); | |
1568 | } | |
1569 | break; | |
7d799210 | 1570 | case 'a': |
aaf07621 | 1571 | return address_val(buf, end, ptr, spec, fmt); |
4b6ccca7 AV |
1572 | case 'd': |
1573 | return dentry_name(buf, end, ptr, spec, fmt); | |
900cca29 GU |
1574 | case 'C': |
1575 | return clock(buf, end, ptr, spec, fmt); | |
4b6ccca7 AV |
1576 | case 'D': |
1577 | return dentry_name(buf, end, | |
1578 | ((const struct file *)ptr)->f_path.dentry, | |
1579 | spec, fmt); | |
fef20d9c FW |
1580 | } |
1581 | spec.flags |= SMALL; | |
1582 | if (spec.field_width == -1) { | |
725fe002 | 1583 | spec.field_width = default_width; |
fef20d9c FW |
1584 | spec.flags |= ZEROPAD; |
1585 | } | |
1586 | spec.base = 16; | |
1587 | ||
1588 | return number(buf, end, (unsigned long) ptr, spec); | |
1589 | } | |
1590 | ||
1591 | /* | |
1592 | * Helper function to decode printf style format. | |
1593 | * Each call decode a token from the format and return the | |
1594 | * number of characters read (or likely the delta where it wants | |
1595 | * to go on the next call). | |
1596 | * The decoded token is returned through the parameters | |
1597 | * | |
1598 | * 'h', 'l', or 'L' for integer fields | |
1599 | * 'z' support added 23/7/1999 S.H. | |
1600 | * 'z' changed to 'Z' --davidm 1/25/99 | |
1601 | * 't' added for ptrdiff_t | |
1602 | * | |
1603 | * @fmt: the format string | |
1604 | * @type of the token returned | |
1605 | * @flags: various flags such as +, -, # tokens.. | |
1606 | * @field_width: overwritten width | |
1607 | * @base: base of the number (octal, hex, ...) | |
1608 | * @precision: precision of a number | |
1609 | * @qualifier: qualifier of a number (long, size_t, ...) | |
1610 | */ | |
cf3b429b JP |
1611 | static noinline_for_stack |
1612 | int format_decode(const char *fmt, struct printf_spec *spec) | |
fef20d9c FW |
1613 | { |
1614 | const char *start = fmt; | |
fef20d9c FW |
1615 | |
1616 | /* we finished early by reading the field width */ | |
ed681a91 | 1617 | if (spec->type == FORMAT_TYPE_WIDTH) { |
fef20d9c FW |
1618 | if (spec->field_width < 0) { |
1619 | spec->field_width = -spec->field_width; | |
1620 | spec->flags |= LEFT; | |
1621 | } | |
1622 | spec->type = FORMAT_TYPE_NONE; | |
1623 | goto precision; | |
1624 | } | |
1625 | ||
1626 | /* we finished early by reading the precision */ | |
1627 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
1628 | if (spec->precision < 0) | |
1629 | spec->precision = 0; | |
1630 | ||
1631 | spec->type = FORMAT_TYPE_NONE; | |
1632 | goto qualifier; | |
1633 | } | |
1634 | ||
1635 | /* By default */ | |
1636 | spec->type = FORMAT_TYPE_NONE; | |
1637 | ||
1638 | for (; *fmt ; ++fmt) { | |
1639 | if (*fmt == '%') | |
1640 | break; | |
1641 | } | |
1642 | ||
1643 | /* Return the current non-format string */ | |
1644 | if (fmt != start || !*fmt) | |
1645 | return fmt - start; | |
1646 | ||
1647 | /* Process flags */ | |
1648 | spec->flags = 0; | |
1649 | ||
1650 | while (1) { /* this also skips first '%' */ | |
1651 | bool found = true; | |
1652 | ||
1653 | ++fmt; | |
1654 | ||
1655 | switch (*fmt) { | |
1656 | case '-': spec->flags |= LEFT; break; | |
1657 | case '+': spec->flags |= PLUS; break; | |
1658 | case ' ': spec->flags |= SPACE; break; | |
1659 | case '#': spec->flags |= SPECIAL; break; | |
1660 | case '0': spec->flags |= ZEROPAD; break; | |
1661 | default: found = false; | |
1662 | } | |
1663 | ||
1664 | if (!found) | |
1665 | break; | |
1666 | } | |
1667 | ||
1668 | /* get field width */ | |
1669 | spec->field_width = -1; | |
1670 | ||
1671 | if (isdigit(*fmt)) | |
1672 | spec->field_width = skip_atoi(&fmt); | |
1673 | else if (*fmt == '*') { | |
1674 | /* it's the next argument */ | |
ed681a91 | 1675 | spec->type = FORMAT_TYPE_WIDTH; |
fef20d9c FW |
1676 | return ++fmt - start; |
1677 | } | |
1678 | ||
1679 | precision: | |
1680 | /* get the precision */ | |
1681 | spec->precision = -1; | |
1682 | if (*fmt == '.') { | |
1683 | ++fmt; | |
1684 | if (isdigit(*fmt)) { | |
1685 | spec->precision = skip_atoi(&fmt); | |
1686 | if (spec->precision < 0) | |
1687 | spec->precision = 0; | |
1688 | } else if (*fmt == '*') { | |
1689 | /* it's the next argument */ | |
adf26f84 | 1690 | spec->type = FORMAT_TYPE_PRECISION; |
fef20d9c FW |
1691 | return ++fmt - start; |
1692 | } | |
1693 | } | |
1694 | ||
1695 | qualifier: | |
1696 | /* get the conversion qualifier */ | |
1697 | spec->qualifier = -1; | |
75fb8f26 AS |
1698 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
1699 | _tolower(*fmt) == 'z' || *fmt == 't') { | |
a4e94ef0 Z |
1700 | spec->qualifier = *fmt++; |
1701 | if (unlikely(spec->qualifier == *fmt)) { | |
1702 | if (spec->qualifier == 'l') { | |
1703 | spec->qualifier = 'L'; | |
1704 | ++fmt; | |
1705 | } else if (spec->qualifier == 'h') { | |
1706 | spec->qualifier = 'H'; | |
1707 | ++fmt; | |
1708 | } | |
fef20d9c FW |
1709 | } |
1710 | } | |
1711 | ||
1712 | /* default base */ | |
1713 | spec->base = 10; | |
1714 | switch (*fmt) { | |
1715 | case 'c': | |
1716 | spec->type = FORMAT_TYPE_CHAR; | |
1717 | return ++fmt - start; | |
1718 | ||
1719 | case 's': | |
1720 | spec->type = FORMAT_TYPE_STR; | |
1721 | return ++fmt - start; | |
1722 | ||
1723 | case 'p': | |
1724 | spec->type = FORMAT_TYPE_PTR; | |
ffbfed03 | 1725 | return ++fmt - start; |
fef20d9c | 1726 | |
fef20d9c FW |
1727 | case '%': |
1728 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
1729 | return ++fmt - start; | |
1730 | ||
1731 | /* integer number formats - set up the flags and "break" */ | |
1732 | case 'o': | |
1733 | spec->base = 8; | |
1734 | break; | |
1735 | ||
1736 | case 'x': | |
1737 | spec->flags |= SMALL; | |
1738 | ||
1739 | case 'X': | |
1740 | spec->base = 16; | |
1741 | break; | |
1742 | ||
1743 | case 'd': | |
1744 | case 'i': | |
39e874f8 | 1745 | spec->flags |= SIGN; |
fef20d9c | 1746 | case 'u': |
4aa99606 | 1747 | break; |
fef20d9c | 1748 | |
708d96fd RM |
1749 | case 'n': |
1750 | /* | |
1751 | * Since %n poses a greater security risk than utility, treat | |
1752 | * it as an invalid format specifier. Warn about its use so | |
1753 | * that new instances don't get added. | |
1754 | */ | |
1755 | WARN_ONCE(1, "Please remove ignored %%n in '%s'\n", fmt); | |
1756 | /* Fall-through */ | |
1757 | ||
fef20d9c FW |
1758 | default: |
1759 | spec->type = FORMAT_TYPE_INVALID; | |
1760 | return fmt - start; | |
0fe1ef24 | 1761 | } |
fef20d9c FW |
1762 | |
1763 | if (spec->qualifier == 'L') | |
1764 | spec->type = FORMAT_TYPE_LONG_LONG; | |
1765 | else if (spec->qualifier == 'l') { | |
51be17df RV |
1766 | BUILD_BUG_ON(FORMAT_TYPE_ULONG + SIGN != FORMAT_TYPE_LONG); |
1767 | spec->type = FORMAT_TYPE_ULONG + (spec->flags & SIGN); | |
75fb8f26 | 1768 | } else if (_tolower(spec->qualifier) == 'z') { |
fef20d9c FW |
1769 | spec->type = FORMAT_TYPE_SIZE_T; |
1770 | } else if (spec->qualifier == 't') { | |
1771 | spec->type = FORMAT_TYPE_PTRDIFF; | |
a4e94ef0 | 1772 | } else if (spec->qualifier == 'H') { |
51be17df RV |
1773 | BUILD_BUG_ON(FORMAT_TYPE_UBYTE + SIGN != FORMAT_TYPE_BYTE); |
1774 | spec->type = FORMAT_TYPE_UBYTE + (spec->flags & SIGN); | |
fef20d9c | 1775 | } else if (spec->qualifier == 'h') { |
51be17df RV |
1776 | BUILD_BUG_ON(FORMAT_TYPE_USHORT + SIGN != FORMAT_TYPE_SHORT); |
1777 | spec->type = FORMAT_TYPE_USHORT + (spec->flags & SIGN); | |
fef20d9c | 1778 | } else { |
51be17df RV |
1779 | BUILD_BUG_ON(FORMAT_TYPE_UINT + SIGN != FORMAT_TYPE_INT); |
1780 | spec->type = FORMAT_TYPE_UINT + (spec->flags & SIGN); | |
78a8bf69 | 1781 | } |
fef20d9c FW |
1782 | |
1783 | return ++fmt - start; | |
78a8bf69 LT |
1784 | } |
1785 | ||
1da177e4 LT |
1786 | /** |
1787 | * vsnprintf - Format a string and place it in a buffer | |
1788 | * @buf: The buffer to place the result into | |
1789 | * @size: The size of the buffer, including the trailing null space | |
1790 | * @fmt: The format string to use | |
1791 | * @args: Arguments for the format string | |
1792 | * | |
20036fdc | 1793 | * This function follows C99 vsnprintf, but has some extensions: |
91adcd2c SR |
1794 | * %pS output the name of a text symbol with offset |
1795 | * %ps output the name of a text symbol without offset | |
0c8b946e FW |
1796 | * %pF output the name of a function pointer with its offset |
1797 | * %pf output the name of a function pointer without its offset | |
0f77a8d3 | 1798 | * %pB output the name of a backtrace symbol with its offset |
8a79503a UKK |
1799 | * %pR output the address range in a struct resource with decoded flags |
1800 | * %pr output the address range in a struct resource with raw flags | |
dbc760bc TH |
1801 | * %pb output the bitmap with field width as the number of bits |
1802 | * %pbl output the bitmap as range list with field width as the number of bits | |
8a79503a | 1803 | * %pM output a 6-byte MAC address with colons |
7c59154e AS |
1804 | * %pMR output a 6-byte MAC address with colons in reversed order |
1805 | * %pMF output a 6-byte MAC address with dashes | |
8a79503a | 1806 | * %pm output a 6-byte MAC address without colons |
7c59154e | 1807 | * %pmR output a 6-byte MAC address without colons in reversed order |
8a79503a UKK |
1808 | * %pI4 print an IPv4 address without leading zeros |
1809 | * %pi4 print an IPv4 address with leading zeros | |
1810 | * %pI6 print an IPv6 address with colons | |
1811 | * %pi6 print an IPv6 address without colons | |
f996f208 | 1812 | * %pI6c print an IPv6 address as specified by RFC 5952 |
10679643 DB |
1813 | * %pIS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address |
1814 | * %piS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address | |
8a79503a UKK |
1815 | * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper |
1816 | * case. | |
71dca95d | 1817 | * %*pE[achnops] print an escaped buffer |
31550a16 AS |
1818 | * %*ph[CDN] a variable-length hex string with a separator (supports up to 64 |
1819 | * bytes of the input) | |
900cca29 GU |
1820 | * %pC output the name (Common Clock Framework) or address (legacy clock |
1821 | * framework) of a clock | |
1822 | * %pCn output the name (Common Clock Framework) or address (legacy clock | |
1823 | * framework) of a clock | |
1824 | * %pCr output the current rate of a clock | |
0efb4d20 | 1825 | * %n is ignored |
20036fdc | 1826 | * |
80f548e0 AM |
1827 | * ** Please update Documentation/printk-formats.txt when making changes ** |
1828 | * | |
1da177e4 LT |
1829 | * The return value is the number of characters which would |
1830 | * be generated for the given input, excluding the trailing | |
1831 | * '\0', as per ISO C99. If you want to have the exact | |
1832 | * number of characters written into @buf as return value | |
72fd4a35 | 1833 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
1834 | * return is greater than or equal to @size, the resulting |
1835 | * string is truncated. | |
1836 | * | |
ba1835eb | 1837 | * If you're not already dealing with a va_list consider using snprintf(). |
1da177e4 LT |
1838 | */ |
1839 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1840 | { | |
1da177e4 | 1841 | unsigned long long num; |
d4be151b | 1842 | char *str, *end; |
fef20d9c | 1843 | struct printf_spec spec = {0}; |
1da177e4 | 1844 | |
f796937a JF |
1845 | /* Reject out-of-range values early. Large positive sizes are |
1846 | used for unknown buffer sizes. */ | |
2aa2f9e2 | 1847 | if (WARN_ON_ONCE(size > INT_MAX)) |
1da177e4 | 1848 | return 0; |
1da177e4 LT |
1849 | |
1850 | str = buf; | |
f796937a | 1851 | end = buf + size; |
1da177e4 | 1852 | |
f796937a JF |
1853 | /* Make sure end is always >= buf */ |
1854 | if (end < buf) { | |
1855 | end = ((void *)-1); | |
1856 | size = end - buf; | |
1da177e4 LT |
1857 | } |
1858 | ||
fef20d9c FW |
1859 | while (*fmt) { |
1860 | const char *old_fmt = fmt; | |
d4be151b | 1861 | int read = format_decode(fmt, &spec); |
1da177e4 | 1862 | |
fef20d9c | 1863 | fmt += read; |
1da177e4 | 1864 | |
fef20d9c FW |
1865 | switch (spec.type) { |
1866 | case FORMAT_TYPE_NONE: { | |
1867 | int copy = read; | |
1868 | if (str < end) { | |
1869 | if (copy > end - str) | |
1870 | copy = end - str; | |
1871 | memcpy(str, old_fmt, copy); | |
1da177e4 | 1872 | } |
fef20d9c FW |
1873 | str += read; |
1874 | break; | |
1da177e4 LT |
1875 | } |
1876 | ||
ed681a91 | 1877 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1878 | spec.field_width = va_arg(args, int); |
1879 | break; | |
1da177e4 | 1880 | |
fef20d9c FW |
1881 | case FORMAT_TYPE_PRECISION: |
1882 | spec.precision = va_arg(args, int); | |
1883 | break; | |
1da177e4 | 1884 | |
d4be151b AGR |
1885 | case FORMAT_TYPE_CHAR: { |
1886 | char c; | |
1887 | ||
fef20d9c FW |
1888 | if (!(spec.flags & LEFT)) { |
1889 | while (--spec.field_width > 0) { | |
f796937a | 1890 | if (str < end) |
1da177e4 LT |
1891 | *str = ' '; |
1892 | ++str; | |
1da177e4 | 1893 | |
fef20d9c FW |
1894 | } |
1895 | } | |
1896 | c = (unsigned char) va_arg(args, int); | |
1897 | if (str < end) | |
1898 | *str = c; | |
1899 | ++str; | |
1900 | while (--spec.field_width > 0) { | |
f796937a | 1901 | if (str < end) |
fef20d9c | 1902 | *str = ' '; |
1da177e4 | 1903 | ++str; |
fef20d9c FW |
1904 | } |
1905 | break; | |
d4be151b | 1906 | } |
1da177e4 | 1907 | |
fef20d9c FW |
1908 | case FORMAT_TYPE_STR: |
1909 | str = string(str, end, va_arg(args, char *), spec); | |
1910 | break; | |
1da177e4 | 1911 | |
fef20d9c | 1912 | case FORMAT_TYPE_PTR: |
ffbfed03 | 1913 | str = pointer(fmt, str, end, va_arg(args, void *), |
fef20d9c FW |
1914 | spec); |
1915 | while (isalnum(*fmt)) | |
1916 | fmt++; | |
1917 | break; | |
1da177e4 | 1918 | |
fef20d9c FW |
1919 | case FORMAT_TYPE_PERCENT_CHAR: |
1920 | if (str < end) | |
1921 | *str = '%'; | |
1922 | ++str; | |
1923 | break; | |
1da177e4 | 1924 | |
fef20d9c FW |
1925 | case FORMAT_TYPE_INVALID: |
1926 | if (str < end) | |
1927 | *str = '%'; | |
1928 | ++str; | |
fef20d9c FW |
1929 | break; |
1930 | ||
fef20d9c FW |
1931 | default: |
1932 | switch (spec.type) { | |
1933 | case FORMAT_TYPE_LONG_LONG: | |
1934 | num = va_arg(args, long long); | |
1935 | break; | |
1936 | case FORMAT_TYPE_ULONG: | |
1937 | num = va_arg(args, unsigned long); | |
1938 | break; | |
1939 | case FORMAT_TYPE_LONG: | |
1940 | num = va_arg(args, long); | |
1941 | break; | |
1942 | case FORMAT_TYPE_SIZE_T: | |
ef124960 JG |
1943 | if (spec.flags & SIGN) |
1944 | num = va_arg(args, ssize_t); | |
1945 | else | |
1946 | num = va_arg(args, size_t); | |
fef20d9c FW |
1947 | break; |
1948 | case FORMAT_TYPE_PTRDIFF: | |
1949 | num = va_arg(args, ptrdiff_t); | |
1950 | break; | |
a4e94ef0 Z |
1951 | case FORMAT_TYPE_UBYTE: |
1952 | num = (unsigned char) va_arg(args, int); | |
1953 | break; | |
1954 | case FORMAT_TYPE_BYTE: | |
1955 | num = (signed char) va_arg(args, int); | |
1956 | break; | |
fef20d9c FW |
1957 | case FORMAT_TYPE_USHORT: |
1958 | num = (unsigned short) va_arg(args, int); | |
1959 | break; | |
1960 | case FORMAT_TYPE_SHORT: | |
1961 | num = (short) va_arg(args, int); | |
1962 | break; | |
39e874f8 FW |
1963 | case FORMAT_TYPE_INT: |
1964 | num = (int) va_arg(args, int); | |
fef20d9c FW |
1965 | break; |
1966 | default: | |
1967 | num = va_arg(args, unsigned int); | |
1968 | } | |
1969 | ||
1970 | str = number(str, end, num, spec); | |
1da177e4 | 1971 | } |
1da177e4 | 1972 | } |
fef20d9c | 1973 | |
f796937a JF |
1974 | if (size > 0) { |
1975 | if (str < end) | |
1976 | *str = '\0'; | |
1977 | else | |
0a6047ee | 1978 | end[-1] = '\0'; |
f796937a | 1979 | } |
fef20d9c | 1980 | |
f796937a | 1981 | /* the trailing null byte doesn't count towards the total */ |
1da177e4 | 1982 | return str-buf; |
fef20d9c | 1983 | |
1da177e4 | 1984 | } |
1da177e4 LT |
1985 | EXPORT_SYMBOL(vsnprintf); |
1986 | ||
1987 | /** | |
1988 | * vscnprintf - Format a string and place it in a buffer | |
1989 | * @buf: The buffer to place the result into | |
1990 | * @size: The size of the buffer, including the trailing null space | |
1991 | * @fmt: The format string to use | |
1992 | * @args: Arguments for the format string | |
1993 | * | |
1994 | * The return value is the number of characters which have been written into | |
b921c69f | 1995 | * the @buf not including the trailing '\0'. If @size is == 0 the function |
1da177e4 LT |
1996 | * returns 0. |
1997 | * | |
ba1835eb | 1998 | * If you're not already dealing with a va_list consider using scnprintf(). |
20036fdc AK |
1999 | * |
2000 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
2001 | */ |
2002 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
2003 | { | |
2004 | int i; | |
2005 | ||
7b9186f5 AGR |
2006 | i = vsnprintf(buf, size, fmt, args); |
2007 | ||
b921c69f AA |
2008 | if (likely(i < size)) |
2009 | return i; | |
2010 | if (size != 0) | |
2011 | return size - 1; | |
2012 | return 0; | |
1da177e4 | 2013 | } |
1da177e4 LT |
2014 | EXPORT_SYMBOL(vscnprintf); |
2015 | ||
2016 | /** | |
2017 | * snprintf - Format a string and place it in a buffer | |
2018 | * @buf: The buffer to place the result into | |
2019 | * @size: The size of the buffer, including the trailing null space | |
2020 | * @fmt: The format string to use | |
2021 | * @...: Arguments for the format string | |
2022 | * | |
2023 | * The return value is the number of characters which would be | |
2024 | * generated for the given input, excluding the trailing null, | |
2025 | * as per ISO C99. If the return is greater than or equal to | |
2026 | * @size, the resulting string is truncated. | |
20036fdc AK |
2027 | * |
2028 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 2029 | */ |
7b9186f5 | 2030 | int snprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
2031 | { |
2032 | va_list args; | |
2033 | int i; | |
2034 | ||
2035 | va_start(args, fmt); | |
7b9186f5 | 2036 | i = vsnprintf(buf, size, fmt, args); |
1da177e4 | 2037 | va_end(args); |
7b9186f5 | 2038 | |
1da177e4 LT |
2039 | return i; |
2040 | } | |
1da177e4 LT |
2041 | EXPORT_SYMBOL(snprintf); |
2042 | ||
2043 | /** | |
2044 | * scnprintf - Format a string and place it in a buffer | |
2045 | * @buf: The buffer to place the result into | |
2046 | * @size: The size of the buffer, including the trailing null space | |
2047 | * @fmt: The format string to use | |
2048 | * @...: Arguments for the format string | |
2049 | * | |
2050 | * The return value is the number of characters written into @buf not including | |
b903c0b8 | 2051 | * the trailing '\0'. If @size is == 0 the function returns 0. |
1da177e4 LT |
2052 | */ |
2053 | ||
7b9186f5 | 2054 | int scnprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
2055 | { |
2056 | va_list args; | |
2057 | int i; | |
2058 | ||
2059 | va_start(args, fmt); | |
b921c69f | 2060 | i = vscnprintf(buf, size, fmt, args); |
1da177e4 | 2061 | va_end(args); |
7b9186f5 | 2062 | |
b921c69f | 2063 | return i; |
1da177e4 LT |
2064 | } |
2065 | EXPORT_SYMBOL(scnprintf); | |
2066 | ||
2067 | /** | |
2068 | * vsprintf - Format a string and place it in a buffer | |
2069 | * @buf: The buffer to place the result into | |
2070 | * @fmt: The format string to use | |
2071 | * @args: Arguments for the format string | |
2072 | * | |
2073 | * The function returns the number of characters written | |
72fd4a35 | 2074 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
2075 | * buffer overflows. |
2076 | * | |
ba1835eb | 2077 | * If you're not already dealing with a va_list consider using sprintf(). |
20036fdc AK |
2078 | * |
2079 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
2080 | */ |
2081 | int vsprintf(char *buf, const char *fmt, va_list args) | |
2082 | { | |
2083 | return vsnprintf(buf, INT_MAX, fmt, args); | |
2084 | } | |
1da177e4 LT |
2085 | EXPORT_SYMBOL(vsprintf); |
2086 | ||
2087 | /** | |
2088 | * sprintf - Format a string and place it in a buffer | |
2089 | * @buf: The buffer to place the result into | |
2090 | * @fmt: The format string to use | |
2091 | * @...: Arguments for the format string | |
2092 | * | |
2093 | * The function returns the number of characters written | |
72fd4a35 | 2094 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 | 2095 | * buffer overflows. |
20036fdc AK |
2096 | * |
2097 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 2098 | */ |
7b9186f5 | 2099 | int sprintf(char *buf, const char *fmt, ...) |
1da177e4 LT |
2100 | { |
2101 | va_list args; | |
2102 | int i; | |
2103 | ||
2104 | va_start(args, fmt); | |
7b9186f5 | 2105 | i = vsnprintf(buf, INT_MAX, fmt, args); |
1da177e4 | 2106 | va_end(args); |
7b9186f5 | 2107 | |
1da177e4 LT |
2108 | return i; |
2109 | } | |
1da177e4 LT |
2110 | EXPORT_SYMBOL(sprintf); |
2111 | ||
4370aa4a LJ |
2112 | #ifdef CONFIG_BINARY_PRINTF |
2113 | /* | |
2114 | * bprintf service: | |
2115 | * vbin_printf() - VA arguments to binary data | |
2116 | * bstr_printf() - Binary data to text string | |
2117 | */ | |
2118 | ||
2119 | /** | |
2120 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
2121 | * @bin_buf: The buffer to place args' binary value | |
2122 | * @size: The size of the buffer(by words(32bits), not characters) | |
2123 | * @fmt: The format string to use | |
2124 | * @args: Arguments for the format string | |
2125 | * | |
2126 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
da3dae54 | 2127 | * is skipped. |
4370aa4a LJ |
2128 | * |
2129 | * The return value is the number of words(32bits) which would be generated for | |
2130 | * the given input. | |
2131 | * | |
2132 | * NOTE: | |
2133 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
2134 | * valid for bstr_printf(). | |
2135 | */ | |
2136 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
2137 | { | |
fef20d9c | 2138 | struct printf_spec spec = {0}; |
4370aa4a | 2139 | char *str, *end; |
4370aa4a LJ |
2140 | |
2141 | str = (char *)bin_buf; | |
2142 | end = (char *)(bin_buf + size); | |
2143 | ||
2144 | #define save_arg(type) \ | |
2145 | do { \ | |
2146 | if (sizeof(type) == 8) { \ | |
2147 | unsigned long long value; \ | |
2148 | str = PTR_ALIGN(str, sizeof(u32)); \ | |
2149 | value = va_arg(args, unsigned long long); \ | |
2150 | if (str + sizeof(type) <= end) { \ | |
2151 | *(u32 *)str = *(u32 *)&value; \ | |
2152 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ | |
2153 | } \ | |
2154 | } else { \ | |
2155 | unsigned long value; \ | |
2156 | str = PTR_ALIGN(str, sizeof(type)); \ | |
2157 | value = va_arg(args, int); \ | |
2158 | if (str + sizeof(type) <= end) \ | |
2159 | *(typeof(type) *)str = (type)value; \ | |
2160 | } \ | |
2161 | str += sizeof(type); \ | |
2162 | } while (0) | |
2163 | ||
fef20d9c | 2164 | while (*fmt) { |
d4be151b | 2165 | int read = format_decode(fmt, &spec); |
4370aa4a | 2166 | |
fef20d9c | 2167 | fmt += read; |
4370aa4a | 2168 | |
fef20d9c FW |
2169 | switch (spec.type) { |
2170 | case FORMAT_TYPE_NONE: | |
d4be151b AGR |
2171 | case FORMAT_TYPE_INVALID: |
2172 | case FORMAT_TYPE_PERCENT_CHAR: | |
fef20d9c FW |
2173 | break; |
2174 | ||
ed681a91 | 2175 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
2176 | case FORMAT_TYPE_PRECISION: |
2177 | save_arg(int); | |
2178 | break; | |
2179 | ||
2180 | case FORMAT_TYPE_CHAR: | |
4370aa4a | 2181 | save_arg(char); |
fef20d9c FW |
2182 | break; |
2183 | ||
2184 | case FORMAT_TYPE_STR: { | |
4370aa4a LJ |
2185 | const char *save_str = va_arg(args, char *); |
2186 | size_t len; | |
6c356634 | 2187 | |
4370aa4a LJ |
2188 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE |
2189 | || (unsigned long)save_str < PAGE_SIZE) | |
0f4f81dc | 2190 | save_str = "(null)"; |
6c356634 AGR |
2191 | len = strlen(save_str) + 1; |
2192 | if (str + len < end) | |
2193 | memcpy(str, save_str, len); | |
2194 | str += len; | |
fef20d9c | 2195 | break; |
4370aa4a | 2196 | } |
fef20d9c FW |
2197 | |
2198 | case FORMAT_TYPE_PTR: | |
4370aa4a LJ |
2199 | save_arg(void *); |
2200 | /* skip all alphanumeric pointer suffixes */ | |
fef20d9c | 2201 | while (isalnum(*fmt)) |
4370aa4a | 2202 | fmt++; |
fef20d9c FW |
2203 | break; |
2204 | ||
fef20d9c FW |
2205 | default: |
2206 | switch (spec.type) { | |
2207 | ||
2208 | case FORMAT_TYPE_LONG_LONG: | |
4370aa4a | 2209 | save_arg(long long); |
fef20d9c FW |
2210 | break; |
2211 | case FORMAT_TYPE_ULONG: | |
2212 | case FORMAT_TYPE_LONG: | |
4370aa4a | 2213 | save_arg(unsigned long); |
fef20d9c FW |
2214 | break; |
2215 | case FORMAT_TYPE_SIZE_T: | |
4370aa4a | 2216 | save_arg(size_t); |
fef20d9c FW |
2217 | break; |
2218 | case FORMAT_TYPE_PTRDIFF: | |
4370aa4a | 2219 | save_arg(ptrdiff_t); |
fef20d9c | 2220 | break; |
a4e94ef0 Z |
2221 | case FORMAT_TYPE_UBYTE: |
2222 | case FORMAT_TYPE_BYTE: | |
2223 | save_arg(char); | |
2224 | break; | |
fef20d9c FW |
2225 | case FORMAT_TYPE_USHORT: |
2226 | case FORMAT_TYPE_SHORT: | |
4370aa4a | 2227 | save_arg(short); |
fef20d9c FW |
2228 | break; |
2229 | default: | |
4370aa4a | 2230 | save_arg(int); |
fef20d9c | 2231 | } |
4370aa4a LJ |
2232 | } |
2233 | } | |
fef20d9c | 2234 | |
7b9186f5 | 2235 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
fef20d9c | 2236 | #undef save_arg |
4370aa4a LJ |
2237 | } |
2238 | EXPORT_SYMBOL_GPL(vbin_printf); | |
2239 | ||
2240 | /** | |
2241 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
2242 | * @buf: The buffer to place the result into | |
2243 | * @size: The size of the buffer, including the trailing null space | |
2244 | * @fmt: The format string to use | |
2245 | * @bin_buf: Binary arguments for the format string | |
2246 | * | |
2247 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
2248 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
2249 | * a binary buffer that generated by vbin_printf. | |
2250 | * | |
2251 | * The format follows C99 vsnprintf, but has some extensions: | |
0efb4d20 | 2252 | * see vsnprintf comment for details. |
4370aa4a LJ |
2253 | * |
2254 | * The return value is the number of characters which would | |
2255 | * be generated for the given input, excluding the trailing | |
2256 | * '\0', as per ISO C99. If you want to have the exact | |
2257 | * number of characters written into @buf as return value | |
2258 | * (not including the trailing '\0'), use vscnprintf(). If the | |
2259 | * return is greater than or equal to @size, the resulting | |
2260 | * string is truncated. | |
2261 | */ | |
2262 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
2263 | { | |
fef20d9c | 2264 | struct printf_spec spec = {0}; |
d4be151b AGR |
2265 | char *str, *end; |
2266 | const char *args = (const char *)bin_buf; | |
4370aa4a | 2267 | |
2f30b1f9 | 2268 | if (WARN_ON_ONCE((int) size < 0)) |
4370aa4a | 2269 | return 0; |
4370aa4a LJ |
2270 | |
2271 | str = buf; | |
2272 | end = buf + size; | |
2273 | ||
2274 | #define get_arg(type) \ | |
2275 | ({ \ | |
2276 | typeof(type) value; \ | |
2277 | if (sizeof(type) == 8) { \ | |
2278 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
2279 | *(u32 *)&value = *(u32 *)args; \ | |
2280 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
2281 | } else { \ | |
2282 | args = PTR_ALIGN(args, sizeof(type)); \ | |
2283 | value = *(typeof(type) *)args; \ | |
2284 | } \ | |
2285 | args += sizeof(type); \ | |
2286 | value; \ | |
2287 | }) | |
2288 | ||
2289 | /* Make sure end is always >= buf */ | |
2290 | if (end < buf) { | |
2291 | end = ((void *)-1); | |
2292 | size = end - buf; | |
2293 | } | |
2294 | ||
fef20d9c | 2295 | while (*fmt) { |
fef20d9c | 2296 | const char *old_fmt = fmt; |
d4be151b | 2297 | int read = format_decode(fmt, &spec); |
4370aa4a | 2298 | |
fef20d9c | 2299 | fmt += read; |
4370aa4a | 2300 | |
fef20d9c FW |
2301 | switch (spec.type) { |
2302 | case FORMAT_TYPE_NONE: { | |
2303 | int copy = read; | |
2304 | if (str < end) { | |
2305 | if (copy > end - str) | |
2306 | copy = end - str; | |
2307 | memcpy(str, old_fmt, copy); | |
4370aa4a | 2308 | } |
fef20d9c FW |
2309 | str += read; |
2310 | break; | |
4370aa4a LJ |
2311 | } |
2312 | ||
ed681a91 | 2313 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
2314 | spec.field_width = get_arg(int); |
2315 | break; | |
4370aa4a | 2316 | |
fef20d9c FW |
2317 | case FORMAT_TYPE_PRECISION: |
2318 | spec.precision = get_arg(int); | |
2319 | break; | |
4370aa4a | 2320 | |
d4be151b AGR |
2321 | case FORMAT_TYPE_CHAR: { |
2322 | char c; | |
2323 | ||
fef20d9c FW |
2324 | if (!(spec.flags & LEFT)) { |
2325 | while (--spec.field_width > 0) { | |
4370aa4a LJ |
2326 | if (str < end) |
2327 | *str = ' '; | |
2328 | ++str; | |
2329 | } | |
2330 | } | |
2331 | c = (unsigned char) get_arg(char); | |
2332 | if (str < end) | |
2333 | *str = c; | |
2334 | ++str; | |
fef20d9c | 2335 | while (--spec.field_width > 0) { |
4370aa4a LJ |
2336 | if (str < end) |
2337 | *str = ' '; | |
2338 | ++str; | |
2339 | } | |
fef20d9c | 2340 | break; |
d4be151b | 2341 | } |
4370aa4a | 2342 | |
fef20d9c | 2343 | case FORMAT_TYPE_STR: { |
4370aa4a | 2344 | const char *str_arg = args; |
d4be151b | 2345 | args += strlen(str_arg) + 1; |
fef20d9c FW |
2346 | str = string(str, end, (char *)str_arg, spec); |
2347 | break; | |
4370aa4a LJ |
2348 | } |
2349 | ||
fef20d9c | 2350 | case FORMAT_TYPE_PTR: |
ffbfed03 | 2351 | str = pointer(fmt, str, end, get_arg(void *), spec); |
fef20d9c | 2352 | while (isalnum(*fmt)) |
4370aa4a | 2353 | fmt++; |
fef20d9c | 2354 | break; |
4370aa4a | 2355 | |
fef20d9c | 2356 | case FORMAT_TYPE_PERCENT_CHAR: |
fef20d9c | 2357 | case FORMAT_TYPE_INVALID: |
4370aa4a LJ |
2358 | if (str < end) |
2359 | *str = '%'; | |
2360 | ++str; | |
fef20d9c FW |
2361 | break; |
2362 | ||
d4be151b AGR |
2363 | default: { |
2364 | unsigned long long num; | |
2365 | ||
fef20d9c FW |
2366 | switch (spec.type) { |
2367 | ||
2368 | case FORMAT_TYPE_LONG_LONG: | |
2369 | num = get_arg(long long); | |
2370 | break; | |
2371 | case FORMAT_TYPE_ULONG: | |
fef20d9c FW |
2372 | case FORMAT_TYPE_LONG: |
2373 | num = get_arg(unsigned long); | |
2374 | break; | |
2375 | case FORMAT_TYPE_SIZE_T: | |
2376 | num = get_arg(size_t); | |
2377 | break; | |
2378 | case FORMAT_TYPE_PTRDIFF: | |
2379 | num = get_arg(ptrdiff_t); | |
2380 | break; | |
a4e94ef0 Z |
2381 | case FORMAT_TYPE_UBYTE: |
2382 | num = get_arg(unsigned char); | |
2383 | break; | |
2384 | case FORMAT_TYPE_BYTE: | |
2385 | num = get_arg(signed char); | |
2386 | break; | |
fef20d9c FW |
2387 | case FORMAT_TYPE_USHORT: |
2388 | num = get_arg(unsigned short); | |
2389 | break; | |
2390 | case FORMAT_TYPE_SHORT: | |
2391 | num = get_arg(short); | |
2392 | break; | |
2393 | case FORMAT_TYPE_UINT: | |
2394 | num = get_arg(unsigned int); | |
2395 | break; | |
2396 | default: | |
2397 | num = get_arg(int); | |
2398 | } | |
2399 | ||
2400 | str = number(str, end, num, spec); | |
d4be151b AGR |
2401 | } /* default: */ |
2402 | } /* switch(spec.type) */ | |
2403 | } /* while(*fmt) */ | |
fef20d9c | 2404 | |
4370aa4a LJ |
2405 | if (size > 0) { |
2406 | if (str < end) | |
2407 | *str = '\0'; | |
2408 | else | |
2409 | end[-1] = '\0'; | |
2410 | } | |
fef20d9c | 2411 | |
4370aa4a LJ |
2412 | #undef get_arg |
2413 | ||
2414 | /* the trailing null byte doesn't count towards the total */ | |
2415 | return str - buf; | |
2416 | } | |
2417 | EXPORT_SYMBOL_GPL(bstr_printf); | |
2418 | ||
2419 | /** | |
2420 | * bprintf - Parse a format string and place args' binary value in a buffer | |
2421 | * @bin_buf: The buffer to place args' binary value | |
2422 | * @size: The size of the buffer(by words(32bits), not characters) | |
2423 | * @fmt: The format string to use | |
2424 | * @...: Arguments for the format string | |
2425 | * | |
2426 | * The function returns the number of words(u32) written | |
2427 | * into @bin_buf. | |
2428 | */ | |
2429 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
2430 | { | |
2431 | va_list args; | |
2432 | int ret; | |
2433 | ||
2434 | va_start(args, fmt); | |
2435 | ret = vbin_printf(bin_buf, size, fmt, args); | |
2436 | va_end(args); | |
7b9186f5 | 2437 | |
4370aa4a LJ |
2438 | return ret; |
2439 | } | |
2440 | EXPORT_SYMBOL_GPL(bprintf); | |
2441 | ||
2442 | #endif /* CONFIG_BINARY_PRINTF */ | |
2443 | ||
1da177e4 LT |
2444 | /** |
2445 | * vsscanf - Unformat a buffer into a list of arguments | |
2446 | * @buf: input buffer | |
2447 | * @fmt: format of buffer | |
2448 | * @args: arguments | |
2449 | */ | |
7b9186f5 | 2450 | int vsscanf(const char *buf, const char *fmt, va_list args) |
1da177e4 LT |
2451 | { |
2452 | const char *str = buf; | |
2453 | char *next; | |
2454 | char digit; | |
2455 | int num = 0; | |
ef0658f3 | 2456 | u8 qualifier; |
53809751 JB |
2457 | unsigned int base; |
2458 | union { | |
2459 | long long s; | |
2460 | unsigned long long u; | |
2461 | } val; | |
ef0658f3 | 2462 | s16 field_width; |
d4be151b | 2463 | bool is_sign; |
1da177e4 | 2464 | |
da99075c | 2465 | while (*fmt) { |
1da177e4 LT |
2466 | /* skip any white space in format */ |
2467 | /* white space in format matchs any amount of | |
2468 | * white space, including none, in the input. | |
2469 | */ | |
2470 | if (isspace(*fmt)) { | |
e7d2860b AGR |
2471 | fmt = skip_spaces(++fmt); |
2472 | str = skip_spaces(str); | |
1da177e4 LT |
2473 | } |
2474 | ||
2475 | /* anything that is not a conversion must match exactly */ | |
2476 | if (*fmt != '%' && *fmt) { | |
2477 | if (*fmt++ != *str++) | |
2478 | break; | |
2479 | continue; | |
2480 | } | |
2481 | ||
2482 | if (!*fmt) | |
2483 | break; | |
2484 | ++fmt; | |
7b9186f5 | 2485 | |
1da177e4 LT |
2486 | /* skip this conversion. |
2487 | * advance both strings to next white space | |
2488 | */ | |
2489 | if (*fmt == '*') { | |
da99075c JB |
2490 | if (!*str) |
2491 | break; | |
8fccae2c | 2492 | while (!isspace(*fmt) && *fmt != '%' && *fmt) |
1da177e4 LT |
2493 | fmt++; |
2494 | while (!isspace(*str) && *str) | |
2495 | str++; | |
2496 | continue; | |
2497 | } | |
2498 | ||
2499 | /* get field width */ | |
2500 | field_width = -1; | |
53809751 | 2501 | if (isdigit(*fmt)) { |
1da177e4 | 2502 | field_width = skip_atoi(&fmt); |
53809751 JB |
2503 | if (field_width <= 0) |
2504 | break; | |
2505 | } | |
1da177e4 LT |
2506 | |
2507 | /* get conversion qualifier */ | |
2508 | qualifier = -1; | |
75fb8f26 AS |
2509 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
2510 | _tolower(*fmt) == 'z') { | |
1da177e4 LT |
2511 | qualifier = *fmt++; |
2512 | if (unlikely(qualifier == *fmt)) { | |
2513 | if (qualifier == 'h') { | |
2514 | qualifier = 'H'; | |
2515 | fmt++; | |
2516 | } else if (qualifier == 'l') { | |
2517 | qualifier = 'L'; | |
2518 | fmt++; | |
2519 | } | |
2520 | } | |
2521 | } | |
1da177e4 | 2522 | |
da99075c JB |
2523 | if (!*fmt) |
2524 | break; | |
2525 | ||
2526 | if (*fmt == 'n') { | |
2527 | /* return number of characters read so far */ | |
2528 | *va_arg(args, int *) = str - buf; | |
2529 | ++fmt; | |
2530 | continue; | |
2531 | } | |
2532 | ||
2533 | if (!*str) | |
1da177e4 LT |
2534 | break; |
2535 | ||
d4be151b | 2536 | base = 10; |
3f623eba | 2537 | is_sign = false; |
d4be151b | 2538 | |
7b9186f5 | 2539 | switch (*fmt++) { |
1da177e4 LT |
2540 | case 'c': |
2541 | { | |
7b9186f5 | 2542 | char *s = (char *)va_arg(args, char*); |
1da177e4 LT |
2543 | if (field_width == -1) |
2544 | field_width = 1; | |
2545 | do { | |
2546 | *s++ = *str++; | |
2547 | } while (--field_width > 0 && *str); | |
2548 | num++; | |
2549 | } | |
2550 | continue; | |
2551 | case 's': | |
2552 | { | |
7b9186f5 AGR |
2553 | char *s = (char *)va_arg(args, char *); |
2554 | if (field_width == -1) | |
4be929be | 2555 | field_width = SHRT_MAX; |
1da177e4 | 2556 | /* first, skip leading white space in buffer */ |
e7d2860b | 2557 | str = skip_spaces(str); |
1da177e4 LT |
2558 | |
2559 | /* now copy until next white space */ | |
7b9186f5 | 2560 | while (*str && !isspace(*str) && field_width--) |
1da177e4 | 2561 | *s++ = *str++; |
1da177e4 LT |
2562 | *s = '\0'; |
2563 | num++; | |
2564 | } | |
2565 | continue; | |
1da177e4 LT |
2566 | case 'o': |
2567 | base = 8; | |
2568 | break; | |
2569 | case 'x': | |
2570 | case 'X': | |
2571 | base = 16; | |
2572 | break; | |
2573 | case 'i': | |
7b9186f5 | 2574 | base = 0; |
1da177e4 | 2575 | case 'd': |
3f623eba | 2576 | is_sign = true; |
1da177e4 LT |
2577 | case 'u': |
2578 | break; | |
2579 | case '%': | |
2580 | /* looking for '%' in str */ | |
7b9186f5 | 2581 | if (*str++ != '%') |
1da177e4 LT |
2582 | return num; |
2583 | continue; | |
2584 | default: | |
2585 | /* invalid format; stop here */ | |
2586 | return num; | |
2587 | } | |
2588 | ||
2589 | /* have some sort of integer conversion. | |
2590 | * first, skip white space in buffer. | |
2591 | */ | |
e7d2860b | 2592 | str = skip_spaces(str); |
1da177e4 LT |
2593 | |
2594 | digit = *str; | |
2595 | if (is_sign && digit == '-') | |
2596 | digit = *(str + 1); | |
2597 | ||
2598 | if (!digit | |
7b9186f5 AGR |
2599 | || (base == 16 && !isxdigit(digit)) |
2600 | || (base == 10 && !isdigit(digit)) | |
2601 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
2602 | || (base == 0 && !isdigit(digit))) | |
2603 | break; | |
1da177e4 | 2604 | |
53809751 JB |
2605 | if (is_sign) |
2606 | val.s = qualifier != 'L' ? | |
2607 | simple_strtol(str, &next, base) : | |
2608 | simple_strtoll(str, &next, base); | |
2609 | else | |
2610 | val.u = qualifier != 'L' ? | |
2611 | simple_strtoul(str, &next, base) : | |
2612 | simple_strtoull(str, &next, base); | |
2613 | ||
2614 | if (field_width > 0 && next - str > field_width) { | |
2615 | if (base == 0) | |
2616 | _parse_integer_fixup_radix(str, &base); | |
2617 | while (next - str > field_width) { | |
2618 | if (is_sign) | |
2619 | val.s = div_s64(val.s, base); | |
2620 | else | |
2621 | val.u = div_u64(val.u, base); | |
2622 | --next; | |
2623 | } | |
2624 | } | |
2625 | ||
7b9186f5 | 2626 | switch (qualifier) { |
1da177e4 | 2627 | case 'H': /* that's 'hh' in format */ |
53809751 JB |
2628 | if (is_sign) |
2629 | *va_arg(args, signed char *) = val.s; | |
2630 | else | |
2631 | *va_arg(args, unsigned char *) = val.u; | |
1da177e4 LT |
2632 | break; |
2633 | case 'h': | |
53809751 JB |
2634 | if (is_sign) |
2635 | *va_arg(args, short *) = val.s; | |
2636 | else | |
2637 | *va_arg(args, unsigned short *) = val.u; | |
1da177e4 LT |
2638 | break; |
2639 | case 'l': | |
53809751 JB |
2640 | if (is_sign) |
2641 | *va_arg(args, long *) = val.s; | |
2642 | else | |
2643 | *va_arg(args, unsigned long *) = val.u; | |
1da177e4 LT |
2644 | break; |
2645 | case 'L': | |
53809751 JB |
2646 | if (is_sign) |
2647 | *va_arg(args, long long *) = val.s; | |
2648 | else | |
2649 | *va_arg(args, unsigned long long *) = val.u; | |
1da177e4 LT |
2650 | break; |
2651 | case 'Z': | |
2652 | case 'z': | |
53809751 JB |
2653 | *va_arg(args, size_t *) = val.u; |
2654 | break; | |
1da177e4 | 2655 | default: |
53809751 JB |
2656 | if (is_sign) |
2657 | *va_arg(args, int *) = val.s; | |
2658 | else | |
2659 | *va_arg(args, unsigned int *) = val.u; | |
1da177e4 LT |
2660 | break; |
2661 | } | |
2662 | num++; | |
2663 | ||
2664 | if (!next) | |
2665 | break; | |
2666 | str = next; | |
2667 | } | |
c6b40d16 | 2668 | |
1da177e4 LT |
2669 | return num; |
2670 | } | |
1da177e4 LT |
2671 | EXPORT_SYMBOL(vsscanf); |
2672 | ||
2673 | /** | |
2674 | * sscanf - Unformat a buffer into a list of arguments | |
2675 | * @buf: input buffer | |
2676 | * @fmt: formatting of buffer | |
2677 | * @...: resulting arguments | |
2678 | */ | |
7b9186f5 | 2679 | int sscanf(const char *buf, const char *fmt, ...) |
1da177e4 LT |
2680 | { |
2681 | va_list args; | |
2682 | int i; | |
2683 | ||
7b9186f5 AGR |
2684 | va_start(args, fmt); |
2685 | i = vsscanf(buf, fmt, args); | |
1da177e4 | 2686 | va_end(args); |
7b9186f5 | 2687 | |
1da177e4 LT |
2688 | return i; |
2689 | } | |
1da177e4 | 2690 | EXPORT_SYMBOL(sscanf); |