Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/lib/vsprintf.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | */ | |
6 | ||
7 | /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */ | |
8 | /* | |
9 | * Wirzenius wrote this portably, Torvalds fucked it up :-) | |
10 | */ | |
11 | ||
7b9186f5 | 12 | /* |
1da177e4 LT |
13 | * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com> |
14 | * - changed to provide snprintf and vsnprintf functions | |
15 | * So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de> | |
16 | * - scnprintf and vscnprintf | |
17 | */ | |
18 | ||
19 | #include <stdarg.h> | |
8bc3bcc9 | 20 | #include <linux/module.h> /* for KSYM_SYMBOL_LEN */ |
1da177e4 LT |
21 | #include <linux/types.h> |
22 | #include <linux/string.h> | |
23 | #include <linux/ctype.h> | |
24 | #include <linux/kernel.h> | |
0fe1ef24 | 25 | #include <linux/kallsyms.h> |
53809751 | 26 | #include <linux/math64.h> |
0fe1ef24 | 27 | #include <linux/uaccess.h> |
332d2e78 | 28 | #include <linux/ioport.h> |
8a27f7c9 | 29 | #include <net/addrconf.h> |
1da177e4 | 30 | |
4e57b681 | 31 | #include <asm/page.h> /* for PAGE_SIZE */ |
deac93df | 32 | #include <asm/sections.h> /* for dereference_function_descriptor() */ |
1da177e4 | 33 | |
1dff46d6 | 34 | #include "kstrtox.h" |
aa46a63e | 35 | |
1da177e4 | 36 | /** |
922ac25c | 37 | * simple_strtoull - convert a string to an unsigned long long |
1da177e4 LT |
38 | * @cp: The start of the string |
39 | * @endp: A pointer to the end of the parsed string will be placed here | |
40 | * @base: The number base to use | |
462e4711 EZ |
41 | * |
42 | * This function is obsolete. Please use kstrtoull instead. | |
1da177e4 | 43 | */ |
922ac25c | 44 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
1da177e4 | 45 | { |
1dff46d6 AD |
46 | unsigned long long result; |
47 | unsigned int rv; | |
aa46a63e | 48 | |
1dff46d6 AD |
49 | cp = _parse_integer_fixup_radix(cp, &base); |
50 | rv = _parse_integer(cp, base, &result); | |
51 | /* FIXME */ | |
52 | cp += (rv & ~KSTRTOX_OVERFLOW); | |
aa46a63e | 53 | |
1da177e4 LT |
54 | if (endp) |
55 | *endp = (char *)cp; | |
7b9186f5 | 56 | |
1da177e4 LT |
57 | return result; |
58 | } | |
922ac25c | 59 | EXPORT_SYMBOL(simple_strtoull); |
1da177e4 LT |
60 | |
61 | /** | |
922ac25c | 62 | * simple_strtoul - convert a string to an unsigned long |
1da177e4 LT |
63 | * @cp: The start of the string |
64 | * @endp: A pointer to the end of the parsed string will be placed here | |
65 | * @base: The number base to use | |
462e4711 EZ |
66 | * |
67 | * This function is obsolete. Please use kstrtoul instead. | |
1da177e4 | 68 | */ |
922ac25c | 69 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
1da177e4 | 70 | { |
922ac25c | 71 | return simple_strtoull(cp, endp, base); |
1da177e4 | 72 | } |
922ac25c | 73 | EXPORT_SYMBOL(simple_strtoul); |
1da177e4 LT |
74 | |
75 | /** | |
922ac25c | 76 | * simple_strtol - convert a string to a signed long |
1da177e4 LT |
77 | * @cp: The start of the string |
78 | * @endp: A pointer to the end of the parsed string will be placed here | |
79 | * @base: The number base to use | |
462e4711 EZ |
80 | * |
81 | * This function is obsolete. Please use kstrtol instead. | |
1da177e4 | 82 | */ |
922ac25c | 83 | long simple_strtol(const char *cp, char **endp, unsigned int base) |
1da177e4 | 84 | { |
922ac25c AGR |
85 | if (*cp == '-') |
86 | return -simple_strtoul(cp + 1, endp, base); | |
7b9186f5 | 87 | |
922ac25c | 88 | return simple_strtoul(cp, endp, base); |
1da177e4 | 89 | } |
922ac25c | 90 | EXPORT_SYMBOL(simple_strtol); |
1da177e4 LT |
91 | |
92 | /** | |
93 | * simple_strtoll - convert a string to a signed long long | |
94 | * @cp: The start of the string | |
95 | * @endp: A pointer to the end of the parsed string will be placed here | |
96 | * @base: The number base to use | |
462e4711 EZ |
97 | * |
98 | * This function is obsolete. Please use kstrtoll instead. | |
1da177e4 | 99 | */ |
22d27051 | 100 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
1da177e4 | 101 | { |
7b9186f5 | 102 | if (*cp == '-') |
22d27051 | 103 | return -simple_strtoull(cp + 1, endp, base); |
7b9186f5 | 104 | |
22d27051 | 105 | return simple_strtoull(cp, endp, base); |
1da177e4 | 106 | } |
98d5ce0d | 107 | EXPORT_SYMBOL(simple_strtoll); |
1da177e4 | 108 | |
cf3b429b JP |
109 | static noinline_for_stack |
110 | int skip_atoi(const char **s) | |
1da177e4 | 111 | { |
7b9186f5 | 112 | int i = 0; |
1da177e4 LT |
113 | |
114 | while (isdigit(**s)) | |
115 | i = i*10 + *((*s)++) - '0'; | |
7b9186f5 | 116 | |
1da177e4 LT |
117 | return i; |
118 | } | |
119 | ||
4277eedd DV |
120 | /* Decimal conversion is by far the most typical, and is used |
121 | * for /proc and /sys data. This directly impacts e.g. top performance | |
122 | * with many processes running. We optimize it for speed | |
133fd9f5 DV |
123 | * using ideas described at <http://www.cs.uiowa.edu/~jones/bcd/divide.html> |
124 | * (with permission from the author, Douglas W. Jones). | |
125 | */ | |
4277eedd | 126 | |
133fd9f5 DV |
127 | #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64 |
128 | /* Formats correctly any integer in [0, 999999999] */ | |
cf3b429b | 129 | static noinline_for_stack |
133fd9f5 | 130 | char *put_dec_full9(char *buf, unsigned q) |
4277eedd | 131 | { |
133fd9f5 | 132 | unsigned r; |
7b9186f5 | 133 | |
133fd9f5 DV |
134 | /* |
135 | * Possible ways to approx. divide by 10 | |
136 | * (x * 0x1999999a) >> 32 x < 1073741829 (multiply must be 64-bit) | |
137 | * (x * 0xcccd) >> 19 x < 81920 (x < 262149 when 64-bit mul) | |
138 | * (x * 0x6667) >> 18 x < 43699 | |
139 | * (x * 0x3334) >> 17 x < 16389 | |
140 | * (x * 0x199a) >> 16 x < 16389 | |
141 | * (x * 0x0ccd) >> 15 x < 16389 | |
142 | * (x * 0x0667) >> 14 x < 2739 | |
143 | * (x * 0x0334) >> 13 x < 1029 | |
144 | * (x * 0x019a) >> 12 x < 1029 | |
145 | * (x * 0x00cd) >> 11 x < 1029 shorter code than * 0x67 (on i386) | |
146 | * (x * 0x0067) >> 10 x < 179 | |
147 | * (x * 0x0034) >> 9 x < 69 same | |
148 | * (x * 0x001a) >> 8 x < 69 same | |
149 | * (x * 0x000d) >> 7 x < 69 same, shortest code (on i386) | |
150 | * (x * 0x0007) >> 6 x < 19 | |
151 | * See <http://www.cs.uiowa.edu/~jones/bcd/divide.html> | |
152 | */ | |
153 | r = (q * (uint64_t)0x1999999a) >> 32; | |
154 | *buf++ = (q - 10 * r) + '0'; /* 1 */ | |
155 | q = (r * (uint64_t)0x1999999a) >> 32; | |
156 | *buf++ = (r - 10 * q) + '0'; /* 2 */ | |
157 | r = (q * (uint64_t)0x1999999a) >> 32; | |
158 | *buf++ = (q - 10 * r) + '0'; /* 3 */ | |
159 | q = (r * (uint64_t)0x1999999a) >> 32; | |
160 | *buf++ = (r - 10 * q) + '0'; /* 4 */ | |
161 | r = (q * (uint64_t)0x1999999a) >> 32; | |
162 | *buf++ = (q - 10 * r) + '0'; /* 5 */ | |
163 | /* Now value is under 10000, can avoid 64-bit multiply */ | |
164 | q = (r * 0x199a) >> 16; | |
165 | *buf++ = (r - 10 * q) + '0'; /* 6 */ | |
166 | r = (q * 0xcd) >> 11; | |
167 | *buf++ = (q - 10 * r) + '0'; /* 7 */ | |
168 | q = (r * 0xcd) >> 11; | |
169 | *buf++ = (r - 10 * q) + '0'; /* 8 */ | |
170 | *buf++ = q + '0'; /* 9 */ | |
4277eedd DV |
171 | return buf; |
172 | } | |
133fd9f5 DV |
173 | #endif |
174 | ||
175 | /* Similar to above but do not pad with zeros. | |
176 | * Code can be easily arranged to print 9 digits too, but our callers | |
177 | * always call put_dec_full9() instead when the number has 9 decimal digits. | |
178 | */ | |
cf3b429b | 179 | static noinline_for_stack |
133fd9f5 | 180 | char *put_dec_trunc8(char *buf, unsigned r) |
4277eedd | 181 | { |
133fd9f5 DV |
182 | unsigned q; |
183 | ||
184 | /* Copy of previous function's body with added early returns */ | |
cb239d0a GS |
185 | while (r >= 10000) { |
186 | q = r + '0'; | |
187 | r = (r * (uint64_t)0x1999999a) >> 32; | |
188 | *buf++ = q - 10*r; | |
189 | } | |
190 | ||
f4000516 GS |
191 | q = (r * 0x199a) >> 16; /* r <= 9999 */ |
192 | *buf++ = (r - 10 * q) + '0'; | |
133fd9f5 DV |
193 | if (q == 0) |
194 | return buf; | |
f4000516 GS |
195 | r = (q * 0xcd) >> 11; /* q <= 999 */ |
196 | *buf++ = (q - 10 * r) + '0'; | |
133fd9f5 DV |
197 | if (r == 0) |
198 | return buf; | |
f4000516 GS |
199 | q = (r * 0xcd) >> 11; /* r <= 99 */ |
200 | *buf++ = (r - 10 * q) + '0'; | |
133fd9f5 DV |
201 | if (q == 0) |
202 | return buf; | |
f4000516 | 203 | *buf++ = q + '0'; /* q <= 9 */ |
133fd9f5 DV |
204 | return buf; |
205 | } | |
4277eedd | 206 | |
133fd9f5 DV |
207 | /* There are two algorithms to print larger numbers. |
208 | * One is generic: divide by 1000000000 and repeatedly print | |
209 | * groups of (up to) 9 digits. It's conceptually simple, | |
210 | * but requires a (unsigned long long) / 1000000000 division. | |
211 | * | |
212 | * Second algorithm splits 64-bit unsigned long long into 16-bit chunks, | |
213 | * manipulates them cleverly and generates groups of 4 decimal digits. | |
214 | * It so happens that it does NOT require long long division. | |
215 | * | |
216 | * If long is > 32 bits, division of 64-bit values is relatively easy, | |
217 | * and we will use the first algorithm. | |
218 | * If long long is > 64 bits (strange architecture with VERY large long long), | |
219 | * second algorithm can't be used, and we again use the first one. | |
220 | * | |
221 | * Else (if long is 32 bits and long long is 64 bits) we use second one. | |
222 | */ | |
7b9186f5 | 223 | |
133fd9f5 DV |
224 | #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64 |
225 | ||
226 | /* First algorithm: generic */ | |
227 | ||
228 | static | |
229 | char *put_dec(char *buf, unsigned long long n) | |
230 | { | |
231 | if (n >= 100*1000*1000) { | |
232 | while (n >= 1000*1000*1000) | |
233 | buf = put_dec_full9(buf, do_div(n, 1000*1000*1000)); | |
234 | if (n >= 100*1000*1000) | |
235 | return put_dec_full9(buf, n); | |
236 | } | |
237 | return put_dec_trunc8(buf, n); | |
4277eedd | 238 | } |
133fd9f5 DV |
239 | |
240 | #else | |
241 | ||
242 | /* Second algorithm: valid only for 64-bit long longs */ | |
243 | ||
e49317d4 | 244 | /* See comment in put_dec_full9 for choice of constants */ |
cf3b429b | 245 | static noinline_for_stack |
2359172a | 246 | void put_dec_full4(char *buf, unsigned q) |
4277eedd | 247 | { |
133fd9f5 | 248 | unsigned r; |
e49317d4 | 249 | r = (q * 0xccd) >> 15; |
2359172a | 250 | buf[0] = (q - 10 * r) + '0'; |
e49317d4 | 251 | q = (r * 0xcd) >> 11; |
2359172a | 252 | buf[1] = (r - 10 * q) + '0'; |
133fd9f5 | 253 | r = (q * 0xcd) >> 11; |
2359172a GS |
254 | buf[2] = (q - 10 * r) + '0'; |
255 | buf[3] = r + '0'; | |
256 | } | |
257 | ||
258 | /* | |
259 | * Call put_dec_full4 on x % 10000, return x / 10000. | |
260 | * The approximation x/10000 == (x * 0x346DC5D7) >> 43 | |
261 | * holds for all x < 1,128,869,999. The largest value this | |
262 | * helper will ever be asked to convert is 1,125,520,955. | |
263 | * (d1 in the put_dec code, assuming n is all-ones). | |
264 | */ | |
265 | static | |
266 | unsigned put_dec_helper4(char *buf, unsigned x) | |
267 | { | |
268 | uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43; | |
269 | ||
270 | put_dec_full4(buf, x - q * 10000); | |
271 | return q; | |
4277eedd DV |
272 | } |
273 | ||
133fd9f5 DV |
274 | /* Based on code by Douglas W. Jones found at |
275 | * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour> | |
276 | * (with permission from the author). | |
277 | * Performs no 64-bit division and hence should be fast on 32-bit machines. | |
278 | */ | |
279 | static | |
280 | char *put_dec(char *buf, unsigned long long n) | |
281 | { | |
282 | uint32_t d3, d2, d1, q, h; | |
283 | ||
284 | if (n < 100*1000*1000) | |
285 | return put_dec_trunc8(buf, n); | |
286 | ||
287 | d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */ | |
288 | h = (n >> 32); | |
289 | d2 = (h ) & 0xffff; | |
290 | d3 = (h >> 16); /* implicit "& 0xffff" */ | |
291 | ||
292 | q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff); | |
2359172a GS |
293 | q = put_dec_helper4(buf, q); |
294 | ||
295 | q += 7671 * d3 + 9496 * d2 + 6 * d1; | |
296 | q = put_dec_helper4(buf+4, q); | |
297 | ||
298 | q += 4749 * d3 + 42 * d2; | |
299 | q = put_dec_helper4(buf+8, q); | |
133fd9f5 | 300 | |
2359172a GS |
301 | q += 281 * d3; |
302 | buf += 12; | |
303 | if (q) | |
304 | buf = put_dec_trunc8(buf, q); | |
305 | else while (buf[-1] == '0') | |
133fd9f5 DV |
306 | --buf; |
307 | ||
308 | return buf; | |
309 | } | |
310 | ||
311 | #endif | |
312 | ||
1ac101a5 KH |
313 | /* |
314 | * Convert passed number to decimal string. | |
315 | * Returns the length of string. On buffer overflow, returns 0. | |
316 | * | |
317 | * If speed is not important, use snprintf(). It's easy to read the code. | |
318 | */ | |
319 | int num_to_str(char *buf, int size, unsigned long long num) | |
320 | { | |
133fd9f5 | 321 | char tmp[sizeof(num) * 3]; |
1ac101a5 KH |
322 | int idx, len; |
323 | ||
133fd9f5 DV |
324 | /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */ |
325 | if (num <= 9) { | |
326 | tmp[0] = '0' + num; | |
327 | len = 1; | |
328 | } else { | |
329 | len = put_dec(tmp, num) - tmp; | |
330 | } | |
1ac101a5 KH |
331 | |
332 | if (len > size) | |
333 | return 0; | |
334 | for (idx = 0; idx < len; ++idx) | |
335 | buf[idx] = tmp[len - idx - 1]; | |
133fd9f5 | 336 | return len; |
1ac101a5 KH |
337 | } |
338 | ||
1da177e4 LT |
339 | #define ZEROPAD 1 /* pad with zero */ |
340 | #define SIGN 2 /* unsigned/signed long */ | |
341 | #define PLUS 4 /* show plus */ | |
342 | #define SPACE 8 /* space if plus */ | |
343 | #define LEFT 16 /* left justified */ | |
b89dc5d6 BH |
344 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ |
345 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ | |
1da177e4 | 346 | |
fef20d9c FW |
347 | enum format_type { |
348 | FORMAT_TYPE_NONE, /* Just a string part */ | |
ed681a91 | 349 | FORMAT_TYPE_WIDTH, |
fef20d9c FW |
350 | FORMAT_TYPE_PRECISION, |
351 | FORMAT_TYPE_CHAR, | |
352 | FORMAT_TYPE_STR, | |
353 | FORMAT_TYPE_PTR, | |
354 | FORMAT_TYPE_PERCENT_CHAR, | |
355 | FORMAT_TYPE_INVALID, | |
356 | FORMAT_TYPE_LONG_LONG, | |
357 | FORMAT_TYPE_ULONG, | |
358 | FORMAT_TYPE_LONG, | |
a4e94ef0 Z |
359 | FORMAT_TYPE_UBYTE, |
360 | FORMAT_TYPE_BYTE, | |
fef20d9c FW |
361 | FORMAT_TYPE_USHORT, |
362 | FORMAT_TYPE_SHORT, | |
363 | FORMAT_TYPE_UINT, | |
364 | FORMAT_TYPE_INT, | |
365 | FORMAT_TYPE_NRCHARS, | |
366 | FORMAT_TYPE_SIZE_T, | |
367 | FORMAT_TYPE_PTRDIFF | |
368 | }; | |
369 | ||
370 | struct printf_spec { | |
4e310fda | 371 | u8 type; /* format_type enum */ |
ef0658f3 | 372 | u8 flags; /* flags to number() */ |
4e310fda JP |
373 | u8 base; /* number base, 8, 10 or 16 only */ |
374 | u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */ | |
375 | s16 field_width; /* width of output field */ | |
376 | s16 precision; /* # of digits/chars */ | |
fef20d9c FW |
377 | }; |
378 | ||
cf3b429b JP |
379 | static noinline_for_stack |
380 | char *number(char *buf, char *end, unsigned long long num, | |
381 | struct printf_spec spec) | |
1da177e4 | 382 | { |
9b706aee DV |
383 | /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ |
384 | static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ | |
385 | ||
386 | char tmp[66]; | |
387 | char sign; | |
388 | char locase; | |
fef20d9c | 389 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
1da177e4 | 390 | int i; |
7c203422 | 391 | bool is_zero = num == 0LL; |
1da177e4 | 392 | |
9b706aee DV |
393 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
394 | * produces same digits or (maybe lowercased) letters */ | |
fef20d9c FW |
395 | locase = (spec.flags & SMALL); |
396 | if (spec.flags & LEFT) | |
397 | spec.flags &= ~ZEROPAD; | |
1da177e4 | 398 | sign = 0; |
fef20d9c | 399 | if (spec.flags & SIGN) { |
7b9186f5 | 400 | if ((signed long long)num < 0) { |
1da177e4 | 401 | sign = '-'; |
7b9186f5 | 402 | num = -(signed long long)num; |
fef20d9c FW |
403 | spec.field_width--; |
404 | } else if (spec.flags & PLUS) { | |
1da177e4 | 405 | sign = '+'; |
fef20d9c FW |
406 | spec.field_width--; |
407 | } else if (spec.flags & SPACE) { | |
1da177e4 | 408 | sign = ' '; |
fef20d9c | 409 | spec.field_width--; |
1da177e4 LT |
410 | } |
411 | } | |
b39a7340 | 412 | if (need_pfx) { |
fef20d9c | 413 | if (spec.base == 16) |
7c203422 PC |
414 | spec.field_width -= 2; |
415 | else if (!is_zero) | |
fef20d9c | 416 | spec.field_width--; |
1da177e4 | 417 | } |
b39a7340 DV |
418 | |
419 | /* generate full string in tmp[], in reverse order */ | |
1da177e4 | 420 | i = 0; |
133fd9f5 DV |
421 | if (num < spec.base) |
422 | tmp[i++] = digits[num] | locase; | |
4277eedd DV |
423 | /* Generic code, for any base: |
424 | else do { | |
9b706aee | 425 | tmp[i++] = (digits[do_div(num,base)] | locase); |
4277eedd DV |
426 | } while (num != 0); |
427 | */ | |
fef20d9c FW |
428 | else if (spec.base != 10) { /* 8 or 16 */ |
429 | int mask = spec.base - 1; | |
b39a7340 | 430 | int shift = 3; |
7b9186f5 AGR |
431 | |
432 | if (spec.base == 16) | |
433 | shift = 4; | |
b39a7340 | 434 | do { |
9b706aee | 435 | tmp[i++] = (digits[((unsigned char)num) & mask] | locase); |
b39a7340 DV |
436 | num >>= shift; |
437 | } while (num); | |
4277eedd DV |
438 | } else { /* base 10 */ |
439 | i = put_dec(tmp, num) - tmp; | |
440 | } | |
b39a7340 DV |
441 | |
442 | /* printing 100 using %2d gives "100", not "00" */ | |
fef20d9c FW |
443 | if (i > spec.precision) |
444 | spec.precision = i; | |
b39a7340 | 445 | /* leading space padding */ |
fef20d9c FW |
446 | spec.field_width -= spec.precision; |
447 | if (!(spec.flags & (ZEROPAD+LEFT))) { | |
7b9186f5 | 448 | while (--spec.field_width >= 0) { |
f796937a | 449 | if (buf < end) |
1da177e4 LT |
450 | *buf = ' '; |
451 | ++buf; | |
452 | } | |
453 | } | |
b39a7340 | 454 | /* sign */ |
1da177e4 | 455 | if (sign) { |
f796937a | 456 | if (buf < end) |
1da177e4 LT |
457 | *buf = sign; |
458 | ++buf; | |
459 | } | |
b39a7340 DV |
460 | /* "0x" / "0" prefix */ |
461 | if (need_pfx) { | |
7c203422 PC |
462 | if (spec.base == 16 || !is_zero) { |
463 | if (buf < end) | |
464 | *buf = '0'; | |
465 | ++buf; | |
466 | } | |
fef20d9c | 467 | if (spec.base == 16) { |
f796937a | 468 | if (buf < end) |
9b706aee | 469 | *buf = ('X' | locase); |
1da177e4 LT |
470 | ++buf; |
471 | } | |
472 | } | |
b39a7340 | 473 | /* zero or space padding */ |
fef20d9c FW |
474 | if (!(spec.flags & LEFT)) { |
475 | char c = (spec.flags & ZEROPAD) ? '0' : ' '; | |
476 | while (--spec.field_width >= 0) { | |
f796937a | 477 | if (buf < end) |
1da177e4 LT |
478 | *buf = c; |
479 | ++buf; | |
480 | } | |
481 | } | |
b39a7340 | 482 | /* hmm even more zero padding? */ |
fef20d9c | 483 | while (i <= --spec.precision) { |
f796937a | 484 | if (buf < end) |
1da177e4 LT |
485 | *buf = '0'; |
486 | ++buf; | |
487 | } | |
b39a7340 DV |
488 | /* actual digits of result */ |
489 | while (--i >= 0) { | |
f796937a | 490 | if (buf < end) |
1da177e4 LT |
491 | *buf = tmp[i]; |
492 | ++buf; | |
493 | } | |
b39a7340 | 494 | /* trailing space padding */ |
fef20d9c | 495 | while (--spec.field_width >= 0) { |
f796937a | 496 | if (buf < end) |
1da177e4 LT |
497 | *buf = ' '; |
498 | ++buf; | |
499 | } | |
7b9186f5 | 500 | |
1da177e4 LT |
501 | return buf; |
502 | } | |
503 | ||
cf3b429b JP |
504 | static noinline_for_stack |
505 | char *string(char *buf, char *end, const char *s, struct printf_spec spec) | |
0f9bfa56 LT |
506 | { |
507 | int len, i; | |
508 | ||
509 | if ((unsigned long)s < PAGE_SIZE) | |
0f4f81dc | 510 | s = "(null)"; |
0f9bfa56 | 511 | |
fef20d9c | 512 | len = strnlen(s, spec.precision); |
0f9bfa56 | 513 | |
fef20d9c FW |
514 | if (!(spec.flags & LEFT)) { |
515 | while (len < spec.field_width--) { | |
0f9bfa56 LT |
516 | if (buf < end) |
517 | *buf = ' '; | |
518 | ++buf; | |
519 | } | |
520 | } | |
521 | for (i = 0; i < len; ++i) { | |
522 | if (buf < end) | |
523 | *buf = *s; | |
524 | ++buf; ++s; | |
525 | } | |
fef20d9c | 526 | while (len < spec.field_width--) { |
0f9bfa56 LT |
527 | if (buf < end) |
528 | *buf = ' '; | |
529 | ++buf; | |
530 | } | |
7b9186f5 | 531 | |
0f9bfa56 LT |
532 | return buf; |
533 | } | |
534 | ||
cf3b429b JP |
535 | static noinline_for_stack |
536 | char *symbol_string(char *buf, char *end, void *ptr, | |
537 | struct printf_spec spec, char ext) | |
0fe1ef24 LT |
538 | { |
539 | unsigned long value = (unsigned long) ptr; | |
540 | #ifdef CONFIG_KALLSYMS | |
541 | char sym[KSYM_SYMBOL_LEN]; | |
0f77a8d3 NK |
542 | if (ext == 'B') |
543 | sprint_backtrace(sym, value); | |
544 | else if (ext != 'f' && ext != 's') | |
0c8b946e FW |
545 | sprint_symbol(sym, value); |
546 | else | |
4796dd20 | 547 | sprint_symbol_no_offset(sym, value); |
7b9186f5 | 548 | |
fef20d9c | 549 | return string(buf, end, sym, spec); |
0fe1ef24 | 550 | #else |
7b9186f5 | 551 | spec.field_width = 2 * sizeof(void *); |
fef20d9c FW |
552 | spec.flags |= SPECIAL | SMALL | ZEROPAD; |
553 | spec.base = 16; | |
7b9186f5 | 554 | |
fef20d9c | 555 | return number(buf, end, value, spec); |
0fe1ef24 LT |
556 | #endif |
557 | } | |
558 | ||
cf3b429b JP |
559 | static noinline_for_stack |
560 | char *resource_string(char *buf, char *end, struct resource *res, | |
561 | struct printf_spec spec, const char *fmt) | |
332d2e78 LT |
562 | { |
563 | #ifndef IO_RSRC_PRINTK_SIZE | |
28405372 | 564 | #define IO_RSRC_PRINTK_SIZE 6 |
332d2e78 LT |
565 | #endif |
566 | ||
567 | #ifndef MEM_RSRC_PRINTK_SIZE | |
28405372 | 568 | #define MEM_RSRC_PRINTK_SIZE 10 |
332d2e78 | 569 | #endif |
4da0b66c | 570 | static const struct printf_spec io_spec = { |
fef20d9c | 571 | .base = 16, |
4da0b66c | 572 | .field_width = IO_RSRC_PRINTK_SIZE, |
fef20d9c FW |
573 | .precision = -1, |
574 | .flags = SPECIAL | SMALL | ZEROPAD, | |
575 | }; | |
4da0b66c BH |
576 | static const struct printf_spec mem_spec = { |
577 | .base = 16, | |
578 | .field_width = MEM_RSRC_PRINTK_SIZE, | |
579 | .precision = -1, | |
580 | .flags = SPECIAL | SMALL | ZEROPAD, | |
581 | }; | |
0f4050c7 BH |
582 | static const struct printf_spec bus_spec = { |
583 | .base = 16, | |
584 | .field_width = 2, | |
585 | .precision = -1, | |
586 | .flags = SMALL | ZEROPAD, | |
587 | }; | |
4da0b66c | 588 | static const struct printf_spec dec_spec = { |
c91d3376 BH |
589 | .base = 10, |
590 | .precision = -1, | |
591 | .flags = 0, | |
592 | }; | |
4da0b66c | 593 | static const struct printf_spec str_spec = { |
fd95541e BH |
594 | .field_width = -1, |
595 | .precision = 10, | |
596 | .flags = LEFT, | |
597 | }; | |
4da0b66c | 598 | static const struct printf_spec flag_spec = { |
fd95541e BH |
599 | .base = 16, |
600 | .precision = -1, | |
601 | .flags = SPECIAL | SMALL, | |
602 | }; | |
c7dabef8 BH |
603 | |
604 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) | |
605 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ | |
606 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) | |
607 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) | |
9d7cca04 | 608 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") |
c7dabef8 BH |
609 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") |
610 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, | |
611 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; | |
612 | ||
332d2e78 | 613 | char *p = sym, *pend = sym + sizeof(sym); |
c7dabef8 | 614 | int decode = (fmt[0] == 'R') ? 1 : 0; |
4da0b66c | 615 | const struct printf_spec *specp; |
332d2e78 LT |
616 | |
617 | *p++ = '['; | |
4da0b66c | 618 | if (res->flags & IORESOURCE_IO) { |
c7dabef8 | 619 | p = string(p, pend, "io ", str_spec); |
4da0b66c BH |
620 | specp = &io_spec; |
621 | } else if (res->flags & IORESOURCE_MEM) { | |
c7dabef8 | 622 | p = string(p, pend, "mem ", str_spec); |
4da0b66c BH |
623 | specp = &mem_spec; |
624 | } else if (res->flags & IORESOURCE_IRQ) { | |
c7dabef8 | 625 | p = string(p, pend, "irq ", str_spec); |
4da0b66c BH |
626 | specp = &dec_spec; |
627 | } else if (res->flags & IORESOURCE_DMA) { | |
c7dabef8 | 628 | p = string(p, pend, "dma ", str_spec); |
4da0b66c | 629 | specp = &dec_spec; |
0f4050c7 BH |
630 | } else if (res->flags & IORESOURCE_BUS) { |
631 | p = string(p, pend, "bus ", str_spec); | |
632 | specp = &bus_spec; | |
4da0b66c | 633 | } else { |
c7dabef8 | 634 | p = string(p, pend, "??? ", str_spec); |
4da0b66c | 635 | specp = &mem_spec; |
c7dabef8 | 636 | decode = 0; |
fd95541e | 637 | } |
4da0b66c | 638 | p = number(p, pend, res->start, *specp); |
c91d3376 BH |
639 | if (res->start != res->end) { |
640 | *p++ = '-'; | |
4da0b66c | 641 | p = number(p, pend, res->end, *specp); |
c91d3376 | 642 | } |
c7dabef8 | 643 | if (decode) { |
fd95541e BH |
644 | if (res->flags & IORESOURCE_MEM_64) |
645 | p = string(p, pend, " 64bit", str_spec); | |
646 | if (res->flags & IORESOURCE_PREFETCH) | |
647 | p = string(p, pend, " pref", str_spec); | |
9d7cca04 BH |
648 | if (res->flags & IORESOURCE_WINDOW) |
649 | p = string(p, pend, " window", str_spec); | |
fd95541e BH |
650 | if (res->flags & IORESOURCE_DISABLED) |
651 | p = string(p, pend, " disabled", str_spec); | |
c7dabef8 BH |
652 | } else { |
653 | p = string(p, pend, " flags ", str_spec); | |
654 | p = number(p, pend, res->flags, flag_spec); | |
fd95541e | 655 | } |
332d2e78 | 656 | *p++ = ']'; |
c7dabef8 | 657 | *p = '\0'; |
332d2e78 | 658 | |
fef20d9c | 659 | return string(buf, end, sym, spec); |
332d2e78 LT |
660 | } |
661 | ||
31550a16 AS |
662 | static noinline_for_stack |
663 | char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
664 | const char *fmt) | |
665 | { | |
666 | int i, len = 1; /* if we pass '%ph[CDN]', field witdh remains | |
667 | negative value, fallback to the default */ | |
668 | char separator; | |
669 | ||
670 | if (spec.field_width == 0) | |
671 | /* nothing to print */ | |
672 | return buf; | |
673 | ||
674 | if (ZERO_OR_NULL_PTR(addr)) | |
675 | /* NULL pointer */ | |
676 | return string(buf, end, NULL, spec); | |
677 | ||
678 | switch (fmt[1]) { | |
679 | case 'C': | |
680 | separator = ':'; | |
681 | break; | |
682 | case 'D': | |
683 | separator = '-'; | |
684 | break; | |
685 | case 'N': | |
686 | separator = 0; | |
687 | break; | |
688 | default: | |
689 | separator = ' '; | |
690 | break; | |
691 | } | |
692 | ||
693 | if (spec.field_width > 0) | |
694 | len = min_t(int, spec.field_width, 64); | |
695 | ||
696 | for (i = 0; i < len && buf < end - 1; i++) { | |
697 | buf = hex_byte_pack(buf, addr[i]); | |
698 | ||
699 | if (buf < end && separator && i != len - 1) | |
700 | *buf++ = separator; | |
701 | } | |
702 | ||
703 | return buf; | |
704 | } | |
705 | ||
cf3b429b JP |
706 | static noinline_for_stack |
707 | char *mac_address_string(char *buf, char *end, u8 *addr, | |
708 | struct printf_spec spec, const char *fmt) | |
dd45c9cf | 709 | { |
8a27f7c9 | 710 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; |
dd45c9cf HH |
711 | char *p = mac_addr; |
712 | int i; | |
bc7259a2 | 713 | char separator; |
76597ff9 | 714 | bool reversed = false; |
bc7259a2 | 715 | |
76597ff9 AE |
716 | switch (fmt[1]) { |
717 | case 'F': | |
bc7259a2 | 718 | separator = '-'; |
76597ff9 AE |
719 | break; |
720 | ||
721 | case 'R': | |
722 | reversed = true; | |
723 | /* fall through */ | |
724 | ||
725 | default: | |
bc7259a2 | 726 | separator = ':'; |
76597ff9 | 727 | break; |
bc7259a2 | 728 | } |
dd45c9cf HH |
729 | |
730 | for (i = 0; i < 6; i++) { | |
76597ff9 AE |
731 | if (reversed) |
732 | p = hex_byte_pack(p, addr[5 - i]); | |
733 | else | |
734 | p = hex_byte_pack(p, addr[i]); | |
735 | ||
8a27f7c9 | 736 | if (fmt[0] == 'M' && i != 5) |
bc7259a2 | 737 | *p++ = separator; |
dd45c9cf HH |
738 | } |
739 | *p = '\0'; | |
740 | ||
fef20d9c | 741 | return string(buf, end, mac_addr, spec); |
dd45c9cf HH |
742 | } |
743 | ||
cf3b429b JP |
744 | static noinline_for_stack |
745 | char *ip4_string(char *p, const u8 *addr, const char *fmt) | |
8a27f7c9 JP |
746 | { |
747 | int i; | |
0159f24e JP |
748 | bool leading_zeros = (fmt[0] == 'i'); |
749 | int index; | |
750 | int step; | |
751 | ||
752 | switch (fmt[2]) { | |
753 | case 'h': | |
754 | #ifdef __BIG_ENDIAN | |
755 | index = 0; | |
756 | step = 1; | |
757 | #else | |
758 | index = 3; | |
759 | step = -1; | |
760 | #endif | |
761 | break; | |
762 | case 'l': | |
763 | index = 3; | |
764 | step = -1; | |
765 | break; | |
766 | case 'n': | |
767 | case 'b': | |
768 | default: | |
769 | index = 0; | |
770 | step = 1; | |
771 | break; | |
772 | } | |
8a27f7c9 JP |
773 | for (i = 0; i < 4; i++) { |
774 | char temp[3]; /* hold each IP quad in reverse order */ | |
133fd9f5 | 775 | int digits = put_dec_trunc8(temp, addr[index]) - temp; |
8a27f7c9 JP |
776 | if (leading_zeros) { |
777 | if (digits < 3) | |
778 | *p++ = '0'; | |
779 | if (digits < 2) | |
780 | *p++ = '0'; | |
781 | } | |
782 | /* reverse the digits in the quad */ | |
783 | while (digits--) | |
784 | *p++ = temp[digits]; | |
785 | if (i < 3) | |
786 | *p++ = '.'; | |
0159f24e | 787 | index += step; |
8a27f7c9 | 788 | } |
8a27f7c9 | 789 | *p = '\0'; |
7b9186f5 | 790 | |
8a27f7c9 JP |
791 | return p; |
792 | } | |
793 | ||
cf3b429b JP |
794 | static noinline_for_stack |
795 | char *ip6_compressed_string(char *p, const char *addr) | |
689afa7d | 796 | { |
7b9186f5 | 797 | int i, j, range; |
8a27f7c9 JP |
798 | unsigned char zerolength[8]; |
799 | int longest = 1; | |
800 | int colonpos = -1; | |
801 | u16 word; | |
7b9186f5 | 802 | u8 hi, lo; |
8a27f7c9 | 803 | bool needcolon = false; |
eb78cd26 JP |
804 | bool useIPv4; |
805 | struct in6_addr in6; | |
806 | ||
807 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
808 | ||
809 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
8a27f7c9 JP |
810 | |
811 | memset(zerolength, 0, sizeof(zerolength)); | |
812 | ||
813 | if (useIPv4) | |
814 | range = 6; | |
815 | else | |
816 | range = 8; | |
817 | ||
818 | /* find position of longest 0 run */ | |
819 | for (i = 0; i < range; i++) { | |
820 | for (j = i; j < range; j++) { | |
eb78cd26 | 821 | if (in6.s6_addr16[j] != 0) |
8a27f7c9 JP |
822 | break; |
823 | zerolength[i]++; | |
824 | } | |
825 | } | |
826 | for (i = 0; i < range; i++) { | |
827 | if (zerolength[i] > longest) { | |
828 | longest = zerolength[i]; | |
829 | colonpos = i; | |
830 | } | |
831 | } | |
29cf519e JP |
832 | if (longest == 1) /* don't compress a single 0 */ |
833 | colonpos = -1; | |
689afa7d | 834 | |
8a27f7c9 JP |
835 | /* emit address */ |
836 | for (i = 0; i < range; i++) { | |
837 | if (i == colonpos) { | |
838 | if (needcolon || i == 0) | |
839 | *p++ = ':'; | |
840 | *p++ = ':'; | |
841 | needcolon = false; | |
842 | i += longest - 1; | |
843 | continue; | |
844 | } | |
845 | if (needcolon) { | |
846 | *p++ = ':'; | |
847 | needcolon = false; | |
848 | } | |
849 | /* hex u16 without leading 0s */ | |
eb78cd26 | 850 | word = ntohs(in6.s6_addr16[i]); |
8a27f7c9 JP |
851 | hi = word >> 8; |
852 | lo = word & 0xff; | |
853 | if (hi) { | |
854 | if (hi > 0x0f) | |
55036ba7 | 855 | p = hex_byte_pack(p, hi); |
8a27f7c9 JP |
856 | else |
857 | *p++ = hex_asc_lo(hi); | |
55036ba7 | 858 | p = hex_byte_pack(p, lo); |
8a27f7c9 | 859 | } |
b5ff992b | 860 | else if (lo > 0x0f) |
55036ba7 | 861 | p = hex_byte_pack(p, lo); |
8a27f7c9 JP |
862 | else |
863 | *p++ = hex_asc_lo(lo); | |
864 | needcolon = true; | |
865 | } | |
866 | ||
867 | if (useIPv4) { | |
868 | if (needcolon) | |
869 | *p++ = ':'; | |
0159f24e | 870 | p = ip4_string(p, &in6.s6_addr[12], "I4"); |
8a27f7c9 | 871 | } |
8a27f7c9 | 872 | *p = '\0'; |
7b9186f5 | 873 | |
8a27f7c9 JP |
874 | return p; |
875 | } | |
876 | ||
cf3b429b JP |
877 | static noinline_for_stack |
878 | char *ip6_string(char *p, const char *addr, const char *fmt) | |
8a27f7c9 JP |
879 | { |
880 | int i; | |
7b9186f5 | 881 | |
689afa7d | 882 | for (i = 0; i < 8; i++) { |
55036ba7 AS |
883 | p = hex_byte_pack(p, *addr++); |
884 | p = hex_byte_pack(p, *addr++); | |
8a27f7c9 | 885 | if (fmt[0] == 'I' && i != 7) |
689afa7d HH |
886 | *p++ = ':'; |
887 | } | |
888 | *p = '\0'; | |
7b9186f5 | 889 | |
8a27f7c9 JP |
890 | return p; |
891 | } | |
892 | ||
cf3b429b JP |
893 | static noinline_for_stack |
894 | char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
895 | struct printf_spec spec, const char *fmt) | |
8a27f7c9 JP |
896 | { |
897 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
898 | ||
899 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
eb78cd26 | 900 | ip6_compressed_string(ip6_addr, addr); |
8a27f7c9 | 901 | else |
eb78cd26 | 902 | ip6_string(ip6_addr, addr, fmt); |
689afa7d | 903 | |
fef20d9c | 904 | return string(buf, end, ip6_addr, spec); |
689afa7d HH |
905 | } |
906 | ||
cf3b429b JP |
907 | static noinline_for_stack |
908 | char *ip4_addr_string(char *buf, char *end, const u8 *addr, | |
909 | struct printf_spec spec, const char *fmt) | |
4aa99606 | 910 | { |
8a27f7c9 | 911 | char ip4_addr[sizeof("255.255.255.255")]; |
4aa99606 | 912 | |
0159f24e | 913 | ip4_string(ip4_addr, addr, fmt); |
4aa99606 | 914 | |
fef20d9c | 915 | return string(buf, end, ip4_addr, spec); |
4aa99606 HH |
916 | } |
917 | ||
cf3b429b JP |
918 | static noinline_for_stack |
919 | char *uuid_string(char *buf, char *end, const u8 *addr, | |
920 | struct printf_spec spec, const char *fmt) | |
9ac6e44e JP |
921 | { |
922 | char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; | |
923 | char *p = uuid; | |
924 | int i; | |
925 | static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; | |
926 | static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; | |
927 | const u8 *index = be; | |
928 | bool uc = false; | |
929 | ||
930 | switch (*(++fmt)) { | |
931 | case 'L': | |
932 | uc = true; /* fall-through */ | |
933 | case 'l': | |
934 | index = le; | |
935 | break; | |
936 | case 'B': | |
937 | uc = true; | |
938 | break; | |
939 | } | |
940 | ||
941 | for (i = 0; i < 16; i++) { | |
55036ba7 | 942 | p = hex_byte_pack(p, addr[index[i]]); |
9ac6e44e JP |
943 | switch (i) { |
944 | case 3: | |
945 | case 5: | |
946 | case 7: | |
947 | case 9: | |
948 | *p++ = '-'; | |
949 | break; | |
950 | } | |
951 | } | |
952 | ||
953 | *p = 0; | |
954 | ||
955 | if (uc) { | |
956 | p = uuid; | |
957 | do { | |
958 | *p = toupper(*p); | |
959 | } while (*(++p)); | |
960 | } | |
961 | ||
962 | return string(buf, end, uuid, spec); | |
963 | } | |
964 | ||
c8f44aff MM |
965 | static |
966 | char *netdev_feature_string(char *buf, char *end, const u8 *addr, | |
967 | struct printf_spec spec) | |
968 | { | |
969 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
970 | if (spec.field_width == -1) | |
971 | spec.field_width = 2 + 2 * sizeof(netdev_features_t); | |
972 | spec.base = 16; | |
973 | ||
974 | return number(buf, end, *(const netdev_features_t *)addr, spec); | |
975 | } | |
976 | ||
411f05f1 | 977 | int kptr_restrict __read_mostly; |
455cd5ab | 978 | |
4d8a743c LT |
979 | /* |
980 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
981 | * by an extra set of alphanumeric characters that are extended format | |
982 | * specifiers. | |
983 | * | |
332d2e78 LT |
984 | * Right now we handle: |
985 | * | |
0c8b946e FW |
986 | * - 'F' For symbolic function descriptor pointers with offset |
987 | * - 'f' For simple symbolic function names without offset | |
0efb4d20 SR |
988 | * - 'S' For symbolic direct pointers with offset |
989 | * - 's' For symbolic direct pointers without offset | |
0f77a8d3 | 990 | * - 'B' For backtraced symbolic direct pointers with offset |
c7dabef8 BH |
991 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] |
992 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] | |
dd45c9cf HH |
993 | * - 'M' For a 6-byte MAC address, it prints the address in the |
994 | * usual colon-separated hex notation | |
8a27f7c9 | 995 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons |
bc7259a2 | 996 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address |
c8e00060 | 997 | * with a dash-separated hex notation |
7c59154e | 998 | * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth) |
8a27f7c9 JP |
999 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way |
1000 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
1001 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
1002 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses | |
1003 | * IPv6 omits the colons (01020304...0f) | |
1004 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
0159f24e | 1005 | * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order |
8a27f7c9 | 1006 | * - 'I6c' for IPv6 addresses printed as specified by |
29cf519e | 1007 | * http://tools.ietf.org/html/rfc5952 |
9ac6e44e JP |
1008 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form |
1009 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" | |
1010 | * Options for %pU are: | |
1011 | * b big endian lower case hex (default) | |
1012 | * B big endian UPPER case hex | |
1013 | * l little endian lower case hex | |
1014 | * L little endian UPPER case hex | |
1015 | * big endian output byte order is: | |
1016 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] | |
1017 | * little endian output byte order is: | |
1018 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] | |
7db6f5fb JP |
1019 | * - 'V' For a struct va_format which contains a format string * and va_list *, |
1020 | * call vsnprintf(->format, *->va_list). | |
1021 | * Implements a "recursive vsnprintf". | |
1022 | * Do not use this feature without some mechanism to verify the | |
1023 | * correctness of the format string and va_list arguments. | |
455cd5ab | 1024 | * - 'K' For a kernel pointer that should be hidden from unprivileged users |
c8f44aff | 1025 | * - 'NF' For a netdev_features_t |
31550a16 AS |
1026 | * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with |
1027 | * a certain separator (' ' by default): | |
1028 | * C colon | |
1029 | * D dash | |
1030 | * N no separator | |
1031 | * The maximum supported length is 64 bytes of the input. Consider | |
1032 | * to use print_hex_dump() for the larger input. | |
7d799210 | 1033 | * - 'a' For a phys_addr_t type and its derivative types (passed by reference) |
9ac6e44e | 1034 | * |
332d2e78 LT |
1035 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 |
1036 | * function pointers are really function descriptors, which contain a | |
1037 | * pointer to the real address. | |
4d8a743c | 1038 | */ |
cf3b429b JP |
1039 | static noinline_for_stack |
1040 | char *pointer(const char *fmt, char *buf, char *end, void *ptr, | |
1041 | struct printf_spec spec) | |
78a8bf69 | 1042 | { |
725fe002 GL |
1043 | int default_width = 2 * sizeof(void *) + (spec.flags & SPECIAL ? 2 : 0); |
1044 | ||
9f36e2c4 | 1045 | if (!ptr && *fmt != 'K') { |
5e057981 JP |
1046 | /* |
1047 | * Print (null) with the same width as a pointer so it makes | |
1048 | * tabular output look nice. | |
1049 | */ | |
1050 | if (spec.field_width == -1) | |
725fe002 | 1051 | spec.field_width = default_width; |
fef20d9c | 1052 | return string(buf, end, "(null)", spec); |
5e057981 | 1053 | } |
d97106ab | 1054 | |
0fe1ef24 LT |
1055 | switch (*fmt) { |
1056 | case 'F': | |
0c8b946e | 1057 | case 'f': |
0fe1ef24 LT |
1058 | ptr = dereference_function_descriptor(ptr); |
1059 | /* Fallthrough */ | |
1060 | case 'S': | |
9ac6e44e | 1061 | case 's': |
0f77a8d3 | 1062 | case 'B': |
0c8b946e | 1063 | return symbol_string(buf, end, ptr, spec, *fmt); |
332d2e78 | 1064 | case 'R': |
c7dabef8 | 1065 | case 'r': |
fd95541e | 1066 | return resource_string(buf, end, ptr, spec, fmt); |
31550a16 AS |
1067 | case 'h': |
1068 | return hex_string(buf, end, ptr, spec, fmt); | |
8a27f7c9 JP |
1069 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
1070 | case 'm': /* Contiguous: 000102030405 */ | |
76597ff9 AE |
1071 | /* [mM]F (FDDI) */ |
1072 | /* [mM]R (Reverse order; Bluetooth) */ | |
8a27f7c9 JP |
1073 | return mac_address_string(buf, end, ptr, spec, fmt); |
1074 | case 'I': /* Formatted IP supported | |
1075 | * 4: 1.2.3.4 | |
1076 | * 6: 0001:0203:...:0708 | |
1077 | * 6c: 1::708 or 1::1.2.3.4 | |
1078 | */ | |
1079 | case 'i': /* Contiguous: | |
1080 | * 4: 001.002.003.004 | |
1081 | * 6: 000102...0f | |
1082 | */ | |
1083 | switch (fmt[1]) { | |
1084 | case '6': | |
1085 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
1086 | case '4': | |
1087 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
1088 | } | |
fef20d9c | 1089 | break; |
9ac6e44e JP |
1090 | case 'U': |
1091 | return uuid_string(buf, end, ptr, spec, fmt); | |
7db6f5fb | 1092 | case 'V': |
5756b76e JB |
1093 | { |
1094 | va_list va; | |
1095 | ||
1096 | va_copy(va, *((struct va_format *)ptr)->va); | |
1097 | buf += vsnprintf(buf, end > buf ? end - buf : 0, | |
1098 | ((struct va_format *)ptr)->fmt, va); | |
1099 | va_end(va); | |
1100 | return buf; | |
1101 | } | |
455cd5ab DR |
1102 | case 'K': |
1103 | /* | |
1104 | * %pK cannot be used in IRQ context because its test | |
1105 | * for CAP_SYSLOG would be meaningless. | |
1106 | */ | |
3715c530 DR |
1107 | if (kptr_restrict && (in_irq() || in_serving_softirq() || |
1108 | in_nmi())) { | |
455cd5ab | 1109 | if (spec.field_width == -1) |
725fe002 | 1110 | spec.field_width = default_width; |
455cd5ab | 1111 | return string(buf, end, "pK-error", spec); |
455cd5ab | 1112 | } |
26297607 JP |
1113 | if (!((kptr_restrict == 0) || |
1114 | (kptr_restrict == 1 && | |
1115 | has_capability_noaudit(current, CAP_SYSLOG)))) | |
1116 | ptr = NULL; | |
1117 | break; | |
c8f44aff MM |
1118 | case 'N': |
1119 | switch (fmt[1]) { | |
1120 | case 'F': | |
1121 | return netdev_feature_string(buf, end, ptr, spec); | |
1122 | } | |
1123 | break; | |
7d799210 SM |
1124 | case 'a': |
1125 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
1126 | spec.field_width = sizeof(phys_addr_t) * 2 + 2; | |
1127 | spec.base = 16; | |
1128 | return number(buf, end, | |
1129 | (unsigned long long) *((phys_addr_t *)ptr), spec); | |
fef20d9c FW |
1130 | } |
1131 | spec.flags |= SMALL; | |
1132 | if (spec.field_width == -1) { | |
725fe002 | 1133 | spec.field_width = default_width; |
fef20d9c FW |
1134 | spec.flags |= ZEROPAD; |
1135 | } | |
1136 | spec.base = 16; | |
1137 | ||
1138 | return number(buf, end, (unsigned long) ptr, spec); | |
1139 | } | |
1140 | ||
1141 | /* | |
1142 | * Helper function to decode printf style format. | |
1143 | * Each call decode a token from the format and return the | |
1144 | * number of characters read (or likely the delta where it wants | |
1145 | * to go on the next call). | |
1146 | * The decoded token is returned through the parameters | |
1147 | * | |
1148 | * 'h', 'l', or 'L' for integer fields | |
1149 | * 'z' support added 23/7/1999 S.H. | |
1150 | * 'z' changed to 'Z' --davidm 1/25/99 | |
1151 | * 't' added for ptrdiff_t | |
1152 | * | |
1153 | * @fmt: the format string | |
1154 | * @type of the token returned | |
1155 | * @flags: various flags such as +, -, # tokens.. | |
1156 | * @field_width: overwritten width | |
1157 | * @base: base of the number (octal, hex, ...) | |
1158 | * @precision: precision of a number | |
1159 | * @qualifier: qualifier of a number (long, size_t, ...) | |
1160 | */ | |
cf3b429b JP |
1161 | static noinline_for_stack |
1162 | int format_decode(const char *fmt, struct printf_spec *spec) | |
fef20d9c FW |
1163 | { |
1164 | const char *start = fmt; | |
fef20d9c FW |
1165 | |
1166 | /* we finished early by reading the field width */ | |
ed681a91 | 1167 | if (spec->type == FORMAT_TYPE_WIDTH) { |
fef20d9c FW |
1168 | if (spec->field_width < 0) { |
1169 | spec->field_width = -spec->field_width; | |
1170 | spec->flags |= LEFT; | |
1171 | } | |
1172 | spec->type = FORMAT_TYPE_NONE; | |
1173 | goto precision; | |
1174 | } | |
1175 | ||
1176 | /* we finished early by reading the precision */ | |
1177 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
1178 | if (spec->precision < 0) | |
1179 | spec->precision = 0; | |
1180 | ||
1181 | spec->type = FORMAT_TYPE_NONE; | |
1182 | goto qualifier; | |
1183 | } | |
1184 | ||
1185 | /* By default */ | |
1186 | spec->type = FORMAT_TYPE_NONE; | |
1187 | ||
1188 | for (; *fmt ; ++fmt) { | |
1189 | if (*fmt == '%') | |
1190 | break; | |
1191 | } | |
1192 | ||
1193 | /* Return the current non-format string */ | |
1194 | if (fmt != start || !*fmt) | |
1195 | return fmt - start; | |
1196 | ||
1197 | /* Process flags */ | |
1198 | spec->flags = 0; | |
1199 | ||
1200 | while (1) { /* this also skips first '%' */ | |
1201 | bool found = true; | |
1202 | ||
1203 | ++fmt; | |
1204 | ||
1205 | switch (*fmt) { | |
1206 | case '-': spec->flags |= LEFT; break; | |
1207 | case '+': spec->flags |= PLUS; break; | |
1208 | case ' ': spec->flags |= SPACE; break; | |
1209 | case '#': spec->flags |= SPECIAL; break; | |
1210 | case '0': spec->flags |= ZEROPAD; break; | |
1211 | default: found = false; | |
1212 | } | |
1213 | ||
1214 | if (!found) | |
1215 | break; | |
1216 | } | |
1217 | ||
1218 | /* get field width */ | |
1219 | spec->field_width = -1; | |
1220 | ||
1221 | if (isdigit(*fmt)) | |
1222 | spec->field_width = skip_atoi(&fmt); | |
1223 | else if (*fmt == '*') { | |
1224 | /* it's the next argument */ | |
ed681a91 | 1225 | spec->type = FORMAT_TYPE_WIDTH; |
fef20d9c FW |
1226 | return ++fmt - start; |
1227 | } | |
1228 | ||
1229 | precision: | |
1230 | /* get the precision */ | |
1231 | spec->precision = -1; | |
1232 | if (*fmt == '.') { | |
1233 | ++fmt; | |
1234 | if (isdigit(*fmt)) { | |
1235 | spec->precision = skip_atoi(&fmt); | |
1236 | if (spec->precision < 0) | |
1237 | spec->precision = 0; | |
1238 | } else if (*fmt == '*') { | |
1239 | /* it's the next argument */ | |
adf26f84 | 1240 | spec->type = FORMAT_TYPE_PRECISION; |
fef20d9c FW |
1241 | return ++fmt - start; |
1242 | } | |
1243 | } | |
1244 | ||
1245 | qualifier: | |
1246 | /* get the conversion qualifier */ | |
1247 | spec->qualifier = -1; | |
75fb8f26 AS |
1248 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
1249 | _tolower(*fmt) == 'z' || *fmt == 't') { | |
a4e94ef0 Z |
1250 | spec->qualifier = *fmt++; |
1251 | if (unlikely(spec->qualifier == *fmt)) { | |
1252 | if (spec->qualifier == 'l') { | |
1253 | spec->qualifier = 'L'; | |
1254 | ++fmt; | |
1255 | } else if (spec->qualifier == 'h') { | |
1256 | spec->qualifier = 'H'; | |
1257 | ++fmt; | |
1258 | } | |
fef20d9c FW |
1259 | } |
1260 | } | |
1261 | ||
1262 | /* default base */ | |
1263 | spec->base = 10; | |
1264 | switch (*fmt) { | |
1265 | case 'c': | |
1266 | spec->type = FORMAT_TYPE_CHAR; | |
1267 | return ++fmt - start; | |
1268 | ||
1269 | case 's': | |
1270 | spec->type = FORMAT_TYPE_STR; | |
1271 | return ++fmt - start; | |
1272 | ||
1273 | case 'p': | |
1274 | spec->type = FORMAT_TYPE_PTR; | |
1275 | return fmt - start; | |
1276 | /* skip alnum */ | |
1277 | ||
1278 | case 'n': | |
1279 | spec->type = FORMAT_TYPE_NRCHARS; | |
1280 | return ++fmt - start; | |
1281 | ||
1282 | case '%': | |
1283 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
1284 | return ++fmt - start; | |
1285 | ||
1286 | /* integer number formats - set up the flags and "break" */ | |
1287 | case 'o': | |
1288 | spec->base = 8; | |
1289 | break; | |
1290 | ||
1291 | case 'x': | |
1292 | spec->flags |= SMALL; | |
1293 | ||
1294 | case 'X': | |
1295 | spec->base = 16; | |
1296 | break; | |
1297 | ||
1298 | case 'd': | |
1299 | case 'i': | |
39e874f8 | 1300 | spec->flags |= SIGN; |
fef20d9c | 1301 | case 'u': |
4aa99606 | 1302 | break; |
fef20d9c FW |
1303 | |
1304 | default: | |
1305 | spec->type = FORMAT_TYPE_INVALID; | |
1306 | return fmt - start; | |
0fe1ef24 | 1307 | } |
fef20d9c FW |
1308 | |
1309 | if (spec->qualifier == 'L') | |
1310 | spec->type = FORMAT_TYPE_LONG_LONG; | |
1311 | else if (spec->qualifier == 'l') { | |
39e874f8 | 1312 | if (spec->flags & SIGN) |
fef20d9c FW |
1313 | spec->type = FORMAT_TYPE_LONG; |
1314 | else | |
1315 | spec->type = FORMAT_TYPE_ULONG; | |
75fb8f26 | 1316 | } else if (_tolower(spec->qualifier) == 'z') { |
fef20d9c FW |
1317 | spec->type = FORMAT_TYPE_SIZE_T; |
1318 | } else if (spec->qualifier == 't') { | |
1319 | spec->type = FORMAT_TYPE_PTRDIFF; | |
a4e94ef0 Z |
1320 | } else if (spec->qualifier == 'H') { |
1321 | if (spec->flags & SIGN) | |
1322 | spec->type = FORMAT_TYPE_BYTE; | |
1323 | else | |
1324 | spec->type = FORMAT_TYPE_UBYTE; | |
fef20d9c | 1325 | } else if (spec->qualifier == 'h') { |
39e874f8 | 1326 | if (spec->flags & SIGN) |
fef20d9c FW |
1327 | spec->type = FORMAT_TYPE_SHORT; |
1328 | else | |
1329 | spec->type = FORMAT_TYPE_USHORT; | |
1330 | } else { | |
39e874f8 | 1331 | if (spec->flags & SIGN) |
fef20d9c FW |
1332 | spec->type = FORMAT_TYPE_INT; |
1333 | else | |
1334 | spec->type = FORMAT_TYPE_UINT; | |
78a8bf69 | 1335 | } |
fef20d9c FW |
1336 | |
1337 | return ++fmt - start; | |
78a8bf69 LT |
1338 | } |
1339 | ||
1da177e4 LT |
1340 | /** |
1341 | * vsnprintf - Format a string and place it in a buffer | |
1342 | * @buf: The buffer to place the result into | |
1343 | * @size: The size of the buffer, including the trailing null space | |
1344 | * @fmt: The format string to use | |
1345 | * @args: Arguments for the format string | |
1346 | * | |
20036fdc | 1347 | * This function follows C99 vsnprintf, but has some extensions: |
91adcd2c SR |
1348 | * %pS output the name of a text symbol with offset |
1349 | * %ps output the name of a text symbol without offset | |
0c8b946e FW |
1350 | * %pF output the name of a function pointer with its offset |
1351 | * %pf output the name of a function pointer without its offset | |
0f77a8d3 | 1352 | * %pB output the name of a backtrace symbol with its offset |
8a79503a UKK |
1353 | * %pR output the address range in a struct resource with decoded flags |
1354 | * %pr output the address range in a struct resource with raw flags | |
1355 | * %pM output a 6-byte MAC address with colons | |
7c59154e AS |
1356 | * %pMR output a 6-byte MAC address with colons in reversed order |
1357 | * %pMF output a 6-byte MAC address with dashes | |
8a79503a | 1358 | * %pm output a 6-byte MAC address without colons |
7c59154e | 1359 | * %pmR output a 6-byte MAC address without colons in reversed order |
8a79503a UKK |
1360 | * %pI4 print an IPv4 address without leading zeros |
1361 | * %pi4 print an IPv4 address with leading zeros | |
1362 | * %pI6 print an IPv6 address with colons | |
1363 | * %pi6 print an IPv6 address without colons | |
f996f208 | 1364 | * %pI6c print an IPv6 address as specified by RFC 5952 |
8a79503a UKK |
1365 | * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper |
1366 | * case. | |
31550a16 AS |
1367 | * %*ph[CDN] a variable-length hex string with a separator (supports up to 64 |
1368 | * bytes of the input) | |
0efb4d20 | 1369 | * %n is ignored |
20036fdc | 1370 | * |
80f548e0 AM |
1371 | * ** Please update Documentation/printk-formats.txt when making changes ** |
1372 | * | |
1da177e4 LT |
1373 | * The return value is the number of characters which would |
1374 | * be generated for the given input, excluding the trailing | |
1375 | * '\0', as per ISO C99. If you want to have the exact | |
1376 | * number of characters written into @buf as return value | |
72fd4a35 | 1377 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
1378 | * return is greater than or equal to @size, the resulting |
1379 | * string is truncated. | |
1380 | * | |
ba1835eb | 1381 | * If you're not already dealing with a va_list consider using snprintf(). |
1da177e4 LT |
1382 | */ |
1383 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1384 | { | |
1da177e4 | 1385 | unsigned long long num; |
d4be151b | 1386 | char *str, *end; |
fef20d9c | 1387 | struct printf_spec spec = {0}; |
1da177e4 | 1388 | |
f796937a JF |
1389 | /* Reject out-of-range values early. Large positive sizes are |
1390 | used for unknown buffer sizes. */ | |
2f30b1f9 | 1391 | if (WARN_ON_ONCE((int) size < 0)) |
1da177e4 | 1392 | return 0; |
1da177e4 LT |
1393 | |
1394 | str = buf; | |
f796937a | 1395 | end = buf + size; |
1da177e4 | 1396 | |
f796937a JF |
1397 | /* Make sure end is always >= buf */ |
1398 | if (end < buf) { | |
1399 | end = ((void *)-1); | |
1400 | size = end - buf; | |
1da177e4 LT |
1401 | } |
1402 | ||
fef20d9c FW |
1403 | while (*fmt) { |
1404 | const char *old_fmt = fmt; | |
d4be151b | 1405 | int read = format_decode(fmt, &spec); |
1da177e4 | 1406 | |
fef20d9c | 1407 | fmt += read; |
1da177e4 | 1408 | |
fef20d9c FW |
1409 | switch (spec.type) { |
1410 | case FORMAT_TYPE_NONE: { | |
1411 | int copy = read; | |
1412 | if (str < end) { | |
1413 | if (copy > end - str) | |
1414 | copy = end - str; | |
1415 | memcpy(str, old_fmt, copy); | |
1da177e4 | 1416 | } |
fef20d9c FW |
1417 | str += read; |
1418 | break; | |
1da177e4 LT |
1419 | } |
1420 | ||
ed681a91 | 1421 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1422 | spec.field_width = va_arg(args, int); |
1423 | break; | |
1da177e4 | 1424 | |
fef20d9c FW |
1425 | case FORMAT_TYPE_PRECISION: |
1426 | spec.precision = va_arg(args, int); | |
1427 | break; | |
1da177e4 | 1428 | |
d4be151b AGR |
1429 | case FORMAT_TYPE_CHAR: { |
1430 | char c; | |
1431 | ||
fef20d9c FW |
1432 | if (!(spec.flags & LEFT)) { |
1433 | while (--spec.field_width > 0) { | |
f796937a | 1434 | if (str < end) |
1da177e4 LT |
1435 | *str = ' '; |
1436 | ++str; | |
1da177e4 | 1437 | |
fef20d9c FW |
1438 | } |
1439 | } | |
1440 | c = (unsigned char) va_arg(args, int); | |
1441 | if (str < end) | |
1442 | *str = c; | |
1443 | ++str; | |
1444 | while (--spec.field_width > 0) { | |
f796937a | 1445 | if (str < end) |
fef20d9c | 1446 | *str = ' '; |
1da177e4 | 1447 | ++str; |
fef20d9c FW |
1448 | } |
1449 | break; | |
d4be151b | 1450 | } |
1da177e4 | 1451 | |
fef20d9c FW |
1452 | case FORMAT_TYPE_STR: |
1453 | str = string(str, end, va_arg(args, char *), spec); | |
1454 | break; | |
1da177e4 | 1455 | |
fef20d9c FW |
1456 | case FORMAT_TYPE_PTR: |
1457 | str = pointer(fmt+1, str, end, va_arg(args, void *), | |
1458 | spec); | |
1459 | while (isalnum(*fmt)) | |
1460 | fmt++; | |
1461 | break; | |
1da177e4 | 1462 | |
fef20d9c FW |
1463 | case FORMAT_TYPE_PERCENT_CHAR: |
1464 | if (str < end) | |
1465 | *str = '%'; | |
1466 | ++str; | |
1467 | break; | |
1da177e4 | 1468 | |
fef20d9c FW |
1469 | case FORMAT_TYPE_INVALID: |
1470 | if (str < end) | |
1471 | *str = '%'; | |
1472 | ++str; | |
fef20d9c FW |
1473 | break; |
1474 | ||
1475 | case FORMAT_TYPE_NRCHARS: { | |
ef0658f3 | 1476 | u8 qualifier = spec.qualifier; |
fef20d9c FW |
1477 | |
1478 | if (qualifier == 'l') { | |
1479 | long *ip = va_arg(args, long *); | |
1480 | *ip = (str - buf); | |
75fb8f26 | 1481 | } else if (_tolower(qualifier) == 'z') { |
fef20d9c FW |
1482 | size_t *ip = va_arg(args, size_t *); |
1483 | *ip = (str - buf); | |
1484 | } else { | |
1485 | int *ip = va_arg(args, int *); | |
1486 | *ip = (str - buf); | |
1487 | } | |
1488 | break; | |
1da177e4 | 1489 | } |
fef20d9c FW |
1490 | |
1491 | default: | |
1492 | switch (spec.type) { | |
1493 | case FORMAT_TYPE_LONG_LONG: | |
1494 | num = va_arg(args, long long); | |
1495 | break; | |
1496 | case FORMAT_TYPE_ULONG: | |
1497 | num = va_arg(args, unsigned long); | |
1498 | break; | |
1499 | case FORMAT_TYPE_LONG: | |
1500 | num = va_arg(args, long); | |
1501 | break; | |
1502 | case FORMAT_TYPE_SIZE_T: | |
ef124960 JG |
1503 | if (spec.flags & SIGN) |
1504 | num = va_arg(args, ssize_t); | |
1505 | else | |
1506 | num = va_arg(args, size_t); | |
fef20d9c FW |
1507 | break; |
1508 | case FORMAT_TYPE_PTRDIFF: | |
1509 | num = va_arg(args, ptrdiff_t); | |
1510 | break; | |
a4e94ef0 Z |
1511 | case FORMAT_TYPE_UBYTE: |
1512 | num = (unsigned char) va_arg(args, int); | |
1513 | break; | |
1514 | case FORMAT_TYPE_BYTE: | |
1515 | num = (signed char) va_arg(args, int); | |
1516 | break; | |
fef20d9c FW |
1517 | case FORMAT_TYPE_USHORT: |
1518 | num = (unsigned short) va_arg(args, int); | |
1519 | break; | |
1520 | case FORMAT_TYPE_SHORT: | |
1521 | num = (short) va_arg(args, int); | |
1522 | break; | |
39e874f8 FW |
1523 | case FORMAT_TYPE_INT: |
1524 | num = (int) va_arg(args, int); | |
fef20d9c FW |
1525 | break; |
1526 | default: | |
1527 | num = va_arg(args, unsigned int); | |
1528 | } | |
1529 | ||
1530 | str = number(str, end, num, spec); | |
1da177e4 | 1531 | } |
1da177e4 | 1532 | } |
fef20d9c | 1533 | |
f796937a JF |
1534 | if (size > 0) { |
1535 | if (str < end) | |
1536 | *str = '\0'; | |
1537 | else | |
0a6047ee | 1538 | end[-1] = '\0'; |
f796937a | 1539 | } |
fef20d9c | 1540 | |
f796937a | 1541 | /* the trailing null byte doesn't count towards the total */ |
1da177e4 | 1542 | return str-buf; |
fef20d9c | 1543 | |
1da177e4 | 1544 | } |
1da177e4 LT |
1545 | EXPORT_SYMBOL(vsnprintf); |
1546 | ||
1547 | /** | |
1548 | * vscnprintf - Format a string and place it in a buffer | |
1549 | * @buf: The buffer to place the result into | |
1550 | * @size: The size of the buffer, including the trailing null space | |
1551 | * @fmt: The format string to use | |
1552 | * @args: Arguments for the format string | |
1553 | * | |
1554 | * The return value is the number of characters which have been written into | |
b921c69f | 1555 | * the @buf not including the trailing '\0'. If @size is == 0 the function |
1da177e4 LT |
1556 | * returns 0. |
1557 | * | |
ba1835eb | 1558 | * If you're not already dealing with a va_list consider using scnprintf(). |
20036fdc AK |
1559 | * |
1560 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1561 | */ |
1562 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1563 | { | |
1564 | int i; | |
1565 | ||
7b9186f5 AGR |
1566 | i = vsnprintf(buf, size, fmt, args); |
1567 | ||
b921c69f AA |
1568 | if (likely(i < size)) |
1569 | return i; | |
1570 | if (size != 0) | |
1571 | return size - 1; | |
1572 | return 0; | |
1da177e4 | 1573 | } |
1da177e4 LT |
1574 | EXPORT_SYMBOL(vscnprintf); |
1575 | ||
1576 | /** | |
1577 | * snprintf - Format a string and place it in a buffer | |
1578 | * @buf: The buffer to place the result into | |
1579 | * @size: The size of the buffer, including the trailing null space | |
1580 | * @fmt: The format string to use | |
1581 | * @...: Arguments for the format string | |
1582 | * | |
1583 | * The return value is the number of characters which would be | |
1584 | * generated for the given input, excluding the trailing null, | |
1585 | * as per ISO C99. If the return is greater than or equal to | |
1586 | * @size, the resulting string is truncated. | |
20036fdc AK |
1587 | * |
1588 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 1589 | */ |
7b9186f5 | 1590 | int snprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
1591 | { |
1592 | va_list args; | |
1593 | int i; | |
1594 | ||
1595 | va_start(args, fmt); | |
7b9186f5 | 1596 | i = vsnprintf(buf, size, fmt, args); |
1da177e4 | 1597 | va_end(args); |
7b9186f5 | 1598 | |
1da177e4 LT |
1599 | return i; |
1600 | } | |
1da177e4 LT |
1601 | EXPORT_SYMBOL(snprintf); |
1602 | ||
1603 | /** | |
1604 | * scnprintf - Format a string and place it in a buffer | |
1605 | * @buf: The buffer to place the result into | |
1606 | * @size: The size of the buffer, including the trailing null space | |
1607 | * @fmt: The format string to use | |
1608 | * @...: Arguments for the format string | |
1609 | * | |
1610 | * The return value is the number of characters written into @buf not including | |
b903c0b8 | 1611 | * the trailing '\0'. If @size is == 0 the function returns 0. |
1da177e4 LT |
1612 | */ |
1613 | ||
7b9186f5 | 1614 | int scnprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
1615 | { |
1616 | va_list args; | |
1617 | int i; | |
1618 | ||
1619 | va_start(args, fmt); | |
b921c69f | 1620 | i = vscnprintf(buf, size, fmt, args); |
1da177e4 | 1621 | va_end(args); |
7b9186f5 | 1622 | |
b921c69f | 1623 | return i; |
1da177e4 LT |
1624 | } |
1625 | EXPORT_SYMBOL(scnprintf); | |
1626 | ||
1627 | /** | |
1628 | * vsprintf - Format a string and place it in a buffer | |
1629 | * @buf: The buffer to place the result into | |
1630 | * @fmt: The format string to use | |
1631 | * @args: Arguments for the format string | |
1632 | * | |
1633 | * The function returns the number of characters written | |
72fd4a35 | 1634 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
1635 | * buffer overflows. |
1636 | * | |
ba1835eb | 1637 | * If you're not already dealing with a va_list consider using sprintf(). |
20036fdc AK |
1638 | * |
1639 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1640 | */ |
1641 | int vsprintf(char *buf, const char *fmt, va_list args) | |
1642 | { | |
1643 | return vsnprintf(buf, INT_MAX, fmt, args); | |
1644 | } | |
1da177e4 LT |
1645 | EXPORT_SYMBOL(vsprintf); |
1646 | ||
1647 | /** | |
1648 | * sprintf - Format a string and place it in a buffer | |
1649 | * @buf: The buffer to place the result into | |
1650 | * @fmt: The format string to use | |
1651 | * @...: Arguments for the format string | |
1652 | * | |
1653 | * The function returns the number of characters written | |
72fd4a35 | 1654 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 | 1655 | * buffer overflows. |
20036fdc AK |
1656 | * |
1657 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 1658 | */ |
7b9186f5 | 1659 | int sprintf(char *buf, const char *fmt, ...) |
1da177e4 LT |
1660 | { |
1661 | va_list args; | |
1662 | int i; | |
1663 | ||
1664 | va_start(args, fmt); | |
7b9186f5 | 1665 | i = vsnprintf(buf, INT_MAX, fmt, args); |
1da177e4 | 1666 | va_end(args); |
7b9186f5 | 1667 | |
1da177e4 LT |
1668 | return i; |
1669 | } | |
1da177e4 LT |
1670 | EXPORT_SYMBOL(sprintf); |
1671 | ||
4370aa4a LJ |
1672 | #ifdef CONFIG_BINARY_PRINTF |
1673 | /* | |
1674 | * bprintf service: | |
1675 | * vbin_printf() - VA arguments to binary data | |
1676 | * bstr_printf() - Binary data to text string | |
1677 | */ | |
1678 | ||
1679 | /** | |
1680 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
1681 | * @bin_buf: The buffer to place args' binary value | |
1682 | * @size: The size of the buffer(by words(32bits), not characters) | |
1683 | * @fmt: The format string to use | |
1684 | * @args: Arguments for the format string | |
1685 | * | |
1686 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
1687 | * is skiped. | |
1688 | * | |
1689 | * The return value is the number of words(32bits) which would be generated for | |
1690 | * the given input. | |
1691 | * | |
1692 | * NOTE: | |
1693 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
1694 | * valid for bstr_printf(). | |
1695 | */ | |
1696 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
1697 | { | |
fef20d9c | 1698 | struct printf_spec spec = {0}; |
4370aa4a | 1699 | char *str, *end; |
4370aa4a LJ |
1700 | |
1701 | str = (char *)bin_buf; | |
1702 | end = (char *)(bin_buf + size); | |
1703 | ||
1704 | #define save_arg(type) \ | |
1705 | do { \ | |
1706 | if (sizeof(type) == 8) { \ | |
1707 | unsigned long long value; \ | |
1708 | str = PTR_ALIGN(str, sizeof(u32)); \ | |
1709 | value = va_arg(args, unsigned long long); \ | |
1710 | if (str + sizeof(type) <= end) { \ | |
1711 | *(u32 *)str = *(u32 *)&value; \ | |
1712 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ | |
1713 | } \ | |
1714 | } else { \ | |
1715 | unsigned long value; \ | |
1716 | str = PTR_ALIGN(str, sizeof(type)); \ | |
1717 | value = va_arg(args, int); \ | |
1718 | if (str + sizeof(type) <= end) \ | |
1719 | *(typeof(type) *)str = (type)value; \ | |
1720 | } \ | |
1721 | str += sizeof(type); \ | |
1722 | } while (0) | |
1723 | ||
fef20d9c | 1724 | while (*fmt) { |
d4be151b | 1725 | int read = format_decode(fmt, &spec); |
4370aa4a | 1726 | |
fef20d9c | 1727 | fmt += read; |
4370aa4a | 1728 | |
fef20d9c FW |
1729 | switch (spec.type) { |
1730 | case FORMAT_TYPE_NONE: | |
d4be151b AGR |
1731 | case FORMAT_TYPE_INVALID: |
1732 | case FORMAT_TYPE_PERCENT_CHAR: | |
fef20d9c FW |
1733 | break; |
1734 | ||
ed681a91 | 1735 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1736 | case FORMAT_TYPE_PRECISION: |
1737 | save_arg(int); | |
1738 | break; | |
1739 | ||
1740 | case FORMAT_TYPE_CHAR: | |
4370aa4a | 1741 | save_arg(char); |
fef20d9c FW |
1742 | break; |
1743 | ||
1744 | case FORMAT_TYPE_STR: { | |
4370aa4a LJ |
1745 | const char *save_str = va_arg(args, char *); |
1746 | size_t len; | |
6c356634 | 1747 | |
4370aa4a LJ |
1748 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE |
1749 | || (unsigned long)save_str < PAGE_SIZE) | |
0f4f81dc | 1750 | save_str = "(null)"; |
6c356634 AGR |
1751 | len = strlen(save_str) + 1; |
1752 | if (str + len < end) | |
1753 | memcpy(str, save_str, len); | |
1754 | str += len; | |
fef20d9c | 1755 | break; |
4370aa4a | 1756 | } |
fef20d9c FW |
1757 | |
1758 | case FORMAT_TYPE_PTR: | |
4370aa4a LJ |
1759 | save_arg(void *); |
1760 | /* skip all alphanumeric pointer suffixes */ | |
fef20d9c | 1761 | while (isalnum(*fmt)) |
4370aa4a | 1762 | fmt++; |
fef20d9c FW |
1763 | break; |
1764 | ||
fef20d9c | 1765 | case FORMAT_TYPE_NRCHARS: { |
4370aa4a | 1766 | /* skip %n 's argument */ |
ef0658f3 | 1767 | u8 qualifier = spec.qualifier; |
4370aa4a LJ |
1768 | void *skip_arg; |
1769 | if (qualifier == 'l') | |
1770 | skip_arg = va_arg(args, long *); | |
75fb8f26 | 1771 | else if (_tolower(qualifier) == 'z') |
4370aa4a LJ |
1772 | skip_arg = va_arg(args, size_t *); |
1773 | else | |
1774 | skip_arg = va_arg(args, int *); | |
fef20d9c | 1775 | break; |
4370aa4a | 1776 | } |
fef20d9c FW |
1777 | |
1778 | default: | |
1779 | switch (spec.type) { | |
1780 | ||
1781 | case FORMAT_TYPE_LONG_LONG: | |
4370aa4a | 1782 | save_arg(long long); |
fef20d9c FW |
1783 | break; |
1784 | case FORMAT_TYPE_ULONG: | |
1785 | case FORMAT_TYPE_LONG: | |
4370aa4a | 1786 | save_arg(unsigned long); |
fef20d9c FW |
1787 | break; |
1788 | case FORMAT_TYPE_SIZE_T: | |
4370aa4a | 1789 | save_arg(size_t); |
fef20d9c FW |
1790 | break; |
1791 | case FORMAT_TYPE_PTRDIFF: | |
4370aa4a | 1792 | save_arg(ptrdiff_t); |
fef20d9c | 1793 | break; |
a4e94ef0 Z |
1794 | case FORMAT_TYPE_UBYTE: |
1795 | case FORMAT_TYPE_BYTE: | |
1796 | save_arg(char); | |
1797 | break; | |
fef20d9c FW |
1798 | case FORMAT_TYPE_USHORT: |
1799 | case FORMAT_TYPE_SHORT: | |
4370aa4a | 1800 | save_arg(short); |
fef20d9c FW |
1801 | break; |
1802 | default: | |
4370aa4a | 1803 | save_arg(int); |
fef20d9c | 1804 | } |
4370aa4a LJ |
1805 | } |
1806 | } | |
fef20d9c | 1807 | |
7b9186f5 | 1808 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
fef20d9c | 1809 | #undef save_arg |
4370aa4a LJ |
1810 | } |
1811 | EXPORT_SYMBOL_GPL(vbin_printf); | |
1812 | ||
1813 | /** | |
1814 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
1815 | * @buf: The buffer to place the result into | |
1816 | * @size: The size of the buffer, including the trailing null space | |
1817 | * @fmt: The format string to use | |
1818 | * @bin_buf: Binary arguments for the format string | |
1819 | * | |
1820 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
1821 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
1822 | * a binary buffer that generated by vbin_printf. | |
1823 | * | |
1824 | * The format follows C99 vsnprintf, but has some extensions: | |
0efb4d20 | 1825 | * see vsnprintf comment for details. |
4370aa4a LJ |
1826 | * |
1827 | * The return value is the number of characters which would | |
1828 | * be generated for the given input, excluding the trailing | |
1829 | * '\0', as per ISO C99. If you want to have the exact | |
1830 | * number of characters written into @buf as return value | |
1831 | * (not including the trailing '\0'), use vscnprintf(). If the | |
1832 | * return is greater than or equal to @size, the resulting | |
1833 | * string is truncated. | |
1834 | */ | |
1835 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
1836 | { | |
fef20d9c | 1837 | struct printf_spec spec = {0}; |
d4be151b AGR |
1838 | char *str, *end; |
1839 | const char *args = (const char *)bin_buf; | |
4370aa4a | 1840 | |
2f30b1f9 | 1841 | if (WARN_ON_ONCE((int) size < 0)) |
4370aa4a | 1842 | return 0; |
4370aa4a LJ |
1843 | |
1844 | str = buf; | |
1845 | end = buf + size; | |
1846 | ||
1847 | #define get_arg(type) \ | |
1848 | ({ \ | |
1849 | typeof(type) value; \ | |
1850 | if (sizeof(type) == 8) { \ | |
1851 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
1852 | *(u32 *)&value = *(u32 *)args; \ | |
1853 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
1854 | } else { \ | |
1855 | args = PTR_ALIGN(args, sizeof(type)); \ | |
1856 | value = *(typeof(type) *)args; \ | |
1857 | } \ | |
1858 | args += sizeof(type); \ | |
1859 | value; \ | |
1860 | }) | |
1861 | ||
1862 | /* Make sure end is always >= buf */ | |
1863 | if (end < buf) { | |
1864 | end = ((void *)-1); | |
1865 | size = end - buf; | |
1866 | } | |
1867 | ||
fef20d9c | 1868 | while (*fmt) { |
fef20d9c | 1869 | const char *old_fmt = fmt; |
d4be151b | 1870 | int read = format_decode(fmt, &spec); |
4370aa4a | 1871 | |
fef20d9c | 1872 | fmt += read; |
4370aa4a | 1873 | |
fef20d9c FW |
1874 | switch (spec.type) { |
1875 | case FORMAT_TYPE_NONE: { | |
1876 | int copy = read; | |
1877 | if (str < end) { | |
1878 | if (copy > end - str) | |
1879 | copy = end - str; | |
1880 | memcpy(str, old_fmt, copy); | |
4370aa4a | 1881 | } |
fef20d9c FW |
1882 | str += read; |
1883 | break; | |
4370aa4a LJ |
1884 | } |
1885 | ||
ed681a91 | 1886 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1887 | spec.field_width = get_arg(int); |
1888 | break; | |
4370aa4a | 1889 | |
fef20d9c FW |
1890 | case FORMAT_TYPE_PRECISION: |
1891 | spec.precision = get_arg(int); | |
1892 | break; | |
4370aa4a | 1893 | |
d4be151b AGR |
1894 | case FORMAT_TYPE_CHAR: { |
1895 | char c; | |
1896 | ||
fef20d9c FW |
1897 | if (!(spec.flags & LEFT)) { |
1898 | while (--spec.field_width > 0) { | |
4370aa4a LJ |
1899 | if (str < end) |
1900 | *str = ' '; | |
1901 | ++str; | |
1902 | } | |
1903 | } | |
1904 | c = (unsigned char) get_arg(char); | |
1905 | if (str < end) | |
1906 | *str = c; | |
1907 | ++str; | |
fef20d9c | 1908 | while (--spec.field_width > 0) { |
4370aa4a LJ |
1909 | if (str < end) |
1910 | *str = ' '; | |
1911 | ++str; | |
1912 | } | |
fef20d9c | 1913 | break; |
d4be151b | 1914 | } |
4370aa4a | 1915 | |
fef20d9c | 1916 | case FORMAT_TYPE_STR: { |
4370aa4a | 1917 | const char *str_arg = args; |
d4be151b | 1918 | args += strlen(str_arg) + 1; |
fef20d9c FW |
1919 | str = string(str, end, (char *)str_arg, spec); |
1920 | break; | |
4370aa4a LJ |
1921 | } |
1922 | ||
fef20d9c FW |
1923 | case FORMAT_TYPE_PTR: |
1924 | str = pointer(fmt+1, str, end, get_arg(void *), spec); | |
1925 | while (isalnum(*fmt)) | |
4370aa4a | 1926 | fmt++; |
fef20d9c | 1927 | break; |
4370aa4a | 1928 | |
fef20d9c | 1929 | case FORMAT_TYPE_PERCENT_CHAR: |
fef20d9c | 1930 | case FORMAT_TYPE_INVALID: |
4370aa4a LJ |
1931 | if (str < end) |
1932 | *str = '%'; | |
1933 | ++str; | |
fef20d9c FW |
1934 | break; |
1935 | ||
1936 | case FORMAT_TYPE_NRCHARS: | |
1937 | /* skip */ | |
1938 | break; | |
1939 | ||
d4be151b AGR |
1940 | default: { |
1941 | unsigned long long num; | |
1942 | ||
fef20d9c FW |
1943 | switch (spec.type) { |
1944 | ||
1945 | case FORMAT_TYPE_LONG_LONG: | |
1946 | num = get_arg(long long); | |
1947 | break; | |
1948 | case FORMAT_TYPE_ULONG: | |
fef20d9c FW |
1949 | case FORMAT_TYPE_LONG: |
1950 | num = get_arg(unsigned long); | |
1951 | break; | |
1952 | case FORMAT_TYPE_SIZE_T: | |
1953 | num = get_arg(size_t); | |
1954 | break; | |
1955 | case FORMAT_TYPE_PTRDIFF: | |
1956 | num = get_arg(ptrdiff_t); | |
1957 | break; | |
a4e94ef0 Z |
1958 | case FORMAT_TYPE_UBYTE: |
1959 | num = get_arg(unsigned char); | |
1960 | break; | |
1961 | case FORMAT_TYPE_BYTE: | |
1962 | num = get_arg(signed char); | |
1963 | break; | |
fef20d9c FW |
1964 | case FORMAT_TYPE_USHORT: |
1965 | num = get_arg(unsigned short); | |
1966 | break; | |
1967 | case FORMAT_TYPE_SHORT: | |
1968 | num = get_arg(short); | |
1969 | break; | |
1970 | case FORMAT_TYPE_UINT: | |
1971 | num = get_arg(unsigned int); | |
1972 | break; | |
1973 | default: | |
1974 | num = get_arg(int); | |
1975 | } | |
1976 | ||
1977 | str = number(str, end, num, spec); | |
d4be151b AGR |
1978 | } /* default: */ |
1979 | } /* switch(spec.type) */ | |
1980 | } /* while(*fmt) */ | |
fef20d9c | 1981 | |
4370aa4a LJ |
1982 | if (size > 0) { |
1983 | if (str < end) | |
1984 | *str = '\0'; | |
1985 | else | |
1986 | end[-1] = '\0'; | |
1987 | } | |
fef20d9c | 1988 | |
4370aa4a LJ |
1989 | #undef get_arg |
1990 | ||
1991 | /* the trailing null byte doesn't count towards the total */ | |
1992 | return str - buf; | |
1993 | } | |
1994 | EXPORT_SYMBOL_GPL(bstr_printf); | |
1995 | ||
1996 | /** | |
1997 | * bprintf - Parse a format string and place args' binary value in a buffer | |
1998 | * @bin_buf: The buffer to place args' binary value | |
1999 | * @size: The size of the buffer(by words(32bits), not characters) | |
2000 | * @fmt: The format string to use | |
2001 | * @...: Arguments for the format string | |
2002 | * | |
2003 | * The function returns the number of words(u32) written | |
2004 | * into @bin_buf. | |
2005 | */ | |
2006 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
2007 | { | |
2008 | va_list args; | |
2009 | int ret; | |
2010 | ||
2011 | va_start(args, fmt); | |
2012 | ret = vbin_printf(bin_buf, size, fmt, args); | |
2013 | va_end(args); | |
7b9186f5 | 2014 | |
4370aa4a LJ |
2015 | return ret; |
2016 | } | |
2017 | EXPORT_SYMBOL_GPL(bprintf); | |
2018 | ||
2019 | #endif /* CONFIG_BINARY_PRINTF */ | |
2020 | ||
1da177e4 LT |
2021 | /** |
2022 | * vsscanf - Unformat a buffer into a list of arguments | |
2023 | * @buf: input buffer | |
2024 | * @fmt: format of buffer | |
2025 | * @args: arguments | |
2026 | */ | |
7b9186f5 | 2027 | int vsscanf(const char *buf, const char *fmt, va_list args) |
1da177e4 LT |
2028 | { |
2029 | const char *str = buf; | |
2030 | char *next; | |
2031 | char digit; | |
2032 | int num = 0; | |
ef0658f3 | 2033 | u8 qualifier; |
53809751 JB |
2034 | unsigned int base; |
2035 | union { | |
2036 | long long s; | |
2037 | unsigned long long u; | |
2038 | } val; | |
ef0658f3 | 2039 | s16 field_width; |
d4be151b | 2040 | bool is_sign; |
1da177e4 | 2041 | |
da99075c | 2042 | while (*fmt) { |
1da177e4 LT |
2043 | /* skip any white space in format */ |
2044 | /* white space in format matchs any amount of | |
2045 | * white space, including none, in the input. | |
2046 | */ | |
2047 | if (isspace(*fmt)) { | |
e7d2860b AGR |
2048 | fmt = skip_spaces(++fmt); |
2049 | str = skip_spaces(str); | |
1da177e4 LT |
2050 | } |
2051 | ||
2052 | /* anything that is not a conversion must match exactly */ | |
2053 | if (*fmt != '%' && *fmt) { | |
2054 | if (*fmt++ != *str++) | |
2055 | break; | |
2056 | continue; | |
2057 | } | |
2058 | ||
2059 | if (!*fmt) | |
2060 | break; | |
2061 | ++fmt; | |
7b9186f5 | 2062 | |
1da177e4 LT |
2063 | /* skip this conversion. |
2064 | * advance both strings to next white space | |
2065 | */ | |
2066 | if (*fmt == '*') { | |
da99075c JB |
2067 | if (!*str) |
2068 | break; | |
8fccae2c | 2069 | while (!isspace(*fmt) && *fmt != '%' && *fmt) |
1da177e4 LT |
2070 | fmt++; |
2071 | while (!isspace(*str) && *str) | |
2072 | str++; | |
2073 | continue; | |
2074 | } | |
2075 | ||
2076 | /* get field width */ | |
2077 | field_width = -1; | |
53809751 | 2078 | if (isdigit(*fmt)) { |
1da177e4 | 2079 | field_width = skip_atoi(&fmt); |
53809751 JB |
2080 | if (field_width <= 0) |
2081 | break; | |
2082 | } | |
1da177e4 LT |
2083 | |
2084 | /* get conversion qualifier */ | |
2085 | qualifier = -1; | |
75fb8f26 AS |
2086 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
2087 | _tolower(*fmt) == 'z') { | |
1da177e4 LT |
2088 | qualifier = *fmt++; |
2089 | if (unlikely(qualifier == *fmt)) { | |
2090 | if (qualifier == 'h') { | |
2091 | qualifier = 'H'; | |
2092 | fmt++; | |
2093 | } else if (qualifier == 'l') { | |
2094 | qualifier = 'L'; | |
2095 | fmt++; | |
2096 | } | |
2097 | } | |
2098 | } | |
1da177e4 | 2099 | |
da99075c JB |
2100 | if (!*fmt) |
2101 | break; | |
2102 | ||
2103 | if (*fmt == 'n') { | |
2104 | /* return number of characters read so far */ | |
2105 | *va_arg(args, int *) = str - buf; | |
2106 | ++fmt; | |
2107 | continue; | |
2108 | } | |
2109 | ||
2110 | if (!*str) | |
1da177e4 LT |
2111 | break; |
2112 | ||
d4be151b AGR |
2113 | base = 10; |
2114 | is_sign = 0; | |
2115 | ||
7b9186f5 | 2116 | switch (*fmt++) { |
1da177e4 LT |
2117 | case 'c': |
2118 | { | |
7b9186f5 | 2119 | char *s = (char *)va_arg(args, char*); |
1da177e4 LT |
2120 | if (field_width == -1) |
2121 | field_width = 1; | |
2122 | do { | |
2123 | *s++ = *str++; | |
2124 | } while (--field_width > 0 && *str); | |
2125 | num++; | |
2126 | } | |
2127 | continue; | |
2128 | case 's': | |
2129 | { | |
7b9186f5 AGR |
2130 | char *s = (char *)va_arg(args, char *); |
2131 | if (field_width == -1) | |
4be929be | 2132 | field_width = SHRT_MAX; |
1da177e4 | 2133 | /* first, skip leading white space in buffer */ |
e7d2860b | 2134 | str = skip_spaces(str); |
1da177e4 LT |
2135 | |
2136 | /* now copy until next white space */ | |
7b9186f5 | 2137 | while (*str && !isspace(*str) && field_width--) |
1da177e4 | 2138 | *s++ = *str++; |
1da177e4 LT |
2139 | *s = '\0'; |
2140 | num++; | |
2141 | } | |
2142 | continue; | |
1da177e4 LT |
2143 | case 'o': |
2144 | base = 8; | |
2145 | break; | |
2146 | case 'x': | |
2147 | case 'X': | |
2148 | base = 16; | |
2149 | break; | |
2150 | case 'i': | |
7b9186f5 | 2151 | base = 0; |
1da177e4 LT |
2152 | case 'd': |
2153 | is_sign = 1; | |
2154 | case 'u': | |
2155 | break; | |
2156 | case '%': | |
2157 | /* looking for '%' in str */ | |
7b9186f5 | 2158 | if (*str++ != '%') |
1da177e4 LT |
2159 | return num; |
2160 | continue; | |
2161 | default: | |
2162 | /* invalid format; stop here */ | |
2163 | return num; | |
2164 | } | |
2165 | ||
2166 | /* have some sort of integer conversion. | |
2167 | * first, skip white space in buffer. | |
2168 | */ | |
e7d2860b | 2169 | str = skip_spaces(str); |
1da177e4 LT |
2170 | |
2171 | digit = *str; | |
2172 | if (is_sign && digit == '-') | |
2173 | digit = *(str + 1); | |
2174 | ||
2175 | if (!digit | |
7b9186f5 AGR |
2176 | || (base == 16 && !isxdigit(digit)) |
2177 | || (base == 10 && !isdigit(digit)) | |
2178 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
2179 | || (base == 0 && !isdigit(digit))) | |
2180 | break; | |
1da177e4 | 2181 | |
53809751 JB |
2182 | if (is_sign) |
2183 | val.s = qualifier != 'L' ? | |
2184 | simple_strtol(str, &next, base) : | |
2185 | simple_strtoll(str, &next, base); | |
2186 | else | |
2187 | val.u = qualifier != 'L' ? | |
2188 | simple_strtoul(str, &next, base) : | |
2189 | simple_strtoull(str, &next, base); | |
2190 | ||
2191 | if (field_width > 0 && next - str > field_width) { | |
2192 | if (base == 0) | |
2193 | _parse_integer_fixup_radix(str, &base); | |
2194 | while (next - str > field_width) { | |
2195 | if (is_sign) | |
2196 | val.s = div_s64(val.s, base); | |
2197 | else | |
2198 | val.u = div_u64(val.u, base); | |
2199 | --next; | |
2200 | } | |
2201 | } | |
2202 | ||
7b9186f5 | 2203 | switch (qualifier) { |
1da177e4 | 2204 | case 'H': /* that's 'hh' in format */ |
53809751 JB |
2205 | if (is_sign) |
2206 | *va_arg(args, signed char *) = val.s; | |
2207 | else | |
2208 | *va_arg(args, unsigned char *) = val.u; | |
1da177e4 LT |
2209 | break; |
2210 | case 'h': | |
53809751 JB |
2211 | if (is_sign) |
2212 | *va_arg(args, short *) = val.s; | |
2213 | else | |
2214 | *va_arg(args, unsigned short *) = val.u; | |
1da177e4 LT |
2215 | break; |
2216 | case 'l': | |
53809751 JB |
2217 | if (is_sign) |
2218 | *va_arg(args, long *) = val.s; | |
2219 | else | |
2220 | *va_arg(args, unsigned long *) = val.u; | |
1da177e4 LT |
2221 | break; |
2222 | case 'L': | |
53809751 JB |
2223 | if (is_sign) |
2224 | *va_arg(args, long long *) = val.s; | |
2225 | else | |
2226 | *va_arg(args, unsigned long long *) = val.u; | |
1da177e4 LT |
2227 | break; |
2228 | case 'Z': | |
2229 | case 'z': | |
53809751 JB |
2230 | *va_arg(args, size_t *) = val.u; |
2231 | break; | |
1da177e4 | 2232 | default: |
53809751 JB |
2233 | if (is_sign) |
2234 | *va_arg(args, int *) = val.s; | |
2235 | else | |
2236 | *va_arg(args, unsigned int *) = val.u; | |
1da177e4 LT |
2237 | break; |
2238 | } | |
2239 | num++; | |
2240 | ||
2241 | if (!next) | |
2242 | break; | |
2243 | str = next; | |
2244 | } | |
c6b40d16 | 2245 | |
1da177e4 LT |
2246 | return num; |
2247 | } | |
1da177e4 LT |
2248 | EXPORT_SYMBOL(vsscanf); |
2249 | ||
2250 | /** | |
2251 | * sscanf - Unformat a buffer into a list of arguments | |
2252 | * @buf: input buffer | |
2253 | * @fmt: formatting of buffer | |
2254 | * @...: resulting arguments | |
2255 | */ | |
7b9186f5 | 2256 | int sscanf(const char *buf, const char *fmt, ...) |
1da177e4 LT |
2257 | { |
2258 | va_list args; | |
2259 | int i; | |
2260 | ||
7b9186f5 AGR |
2261 | va_start(args, fmt); |
2262 | i = vsscanf(buf, fmt, args); | |
1da177e4 | 2263 | va_end(args); |
7b9186f5 | 2264 | |
1da177e4 LT |
2265 | return i; |
2266 | } | |
1da177e4 | 2267 | EXPORT_SYMBOL(sscanf); |