blob: dc16743770094e06761a1a5110e1560c731a0ebf [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/lib/vsprintf.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
6
7/* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
8/*
9 * Wirzenius wrote this portably, Torvalds fucked it up :-)
10 */
11
12/*
13 * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com>
14 * - changed to provide snprintf and vsnprintf functions
15 * So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de>
16 * - scnprintf and vscnprintf
17 */
18
19#include <stdarg.h>
20#include <linux/module.h>
21#include <linux/types.h>
22#include <linux/string.h>
23#include <linux/ctype.h>
24#include <linux/kernel.h>
Linus Torvalds0fe1ef22008-07-06 16:43:12 -070025#include <linux/kallsyms.h>
26#include <linux/uaccess.h>
Linus Torvalds332d2e72008-10-20 15:07:34 +110027#include <linux/ioport.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
Tim Schmielau4e57b682005-10-30 15:03:48 -080029#include <asm/page.h> /* for PAGE_SIZE */
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <asm/div64.h>
James Bottomleydeac93d2008-09-03 20:43:36 -050031#include <asm/sections.h> /* for dereference_function_descriptor() */
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
Denys Vlasenko9b706ae2008-02-09 23:24:09 +010033/* Works only for digits and letters, but small and fast */
34#define TOLOWER(x) ((x) | 0x20)
35
Harvey Harrisonaa46a632008-10-16 13:40:34 -070036static unsigned int simple_guess_base(const char *cp)
37{
38 if (cp[0] == '0') {
39 if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2]))
40 return 16;
41 else
42 return 8;
43 } else {
44 return 10;
45 }
46}
47
Linus Torvalds1da177e2005-04-16 15:20:36 -070048/**
49 * simple_strtoul - convert a string to an unsigned long
50 * @cp: The start of the string
51 * @endp: A pointer to the end of the parsed string will be placed here
52 * @base: The number base to use
53 */
Harvey Harrison22d27052008-10-16 13:40:35 -070054unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
Linus Torvalds1da177e2005-04-16 15:20:36 -070055{
Harvey Harrisonaa46a632008-10-16 13:40:34 -070056 unsigned long result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
Harvey Harrisonaa46a632008-10-16 13:40:34 -070058 if (!base)
59 base = simple_guess_base(cp);
60
61 if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x')
62 cp += 2;
63
64 while (isxdigit(*cp)) {
65 unsigned int value;
66
67 value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10;
68 if (value >= base)
69 break;
70 result = result * base + value;
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 cp++;
72 }
Harvey Harrisonaa46a632008-10-16 13:40:34 -070073
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 if (endp)
75 *endp = (char *)cp;
76 return result;
77}
Linus Torvalds1da177e2005-04-16 15:20:36 -070078EXPORT_SYMBOL(simple_strtoul);
79
80/**
81 * simple_strtol - convert a string to a signed long
82 * @cp: The start of the string
83 * @endp: A pointer to the end of the parsed string will be placed here
84 * @base: The number base to use
85 */
Harvey Harrison22d27052008-10-16 13:40:35 -070086long simple_strtol(const char *cp, char **endp, unsigned int base)
Linus Torvalds1da177e2005-04-16 15:20:36 -070087{
Harvey Harrison22d27052008-10-16 13:40:35 -070088 if(*cp == '-')
89 return -simple_strtoul(cp + 1, endp, base);
90 return simple_strtoul(cp, endp, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091}
Linus Torvalds1da177e2005-04-16 15:20:36 -070092EXPORT_SYMBOL(simple_strtol);
93
94/**
95 * simple_strtoull - convert a string to an unsigned long long
96 * @cp: The start of the string
97 * @endp: A pointer to the end of the parsed string will be placed here
98 * @base: The number base to use
99 */
Harvey Harrison22d27052008-10-16 13:40:35 -0700100unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101{
Harvey Harrisonaa46a632008-10-16 13:40:34 -0700102 unsigned long long result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
Harvey Harrisonaa46a632008-10-16 13:40:34 -0700104 if (!base)
105 base = simple_guess_base(cp);
106
107 if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x')
108 cp += 2;
109
110 while (isxdigit(*cp)) {
111 unsigned int value;
112
113 value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10;
114 if (value >= base)
115 break;
116 result = result * base + value;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 cp++;
118 }
Harvey Harrisonaa46a632008-10-16 13:40:34 -0700119
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 if (endp)
121 *endp = (char *)cp;
122 return result;
123}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124EXPORT_SYMBOL(simple_strtoull);
125
126/**
127 * simple_strtoll - convert a string to a signed long long
128 * @cp: The start of the string
129 * @endp: A pointer to the end of the parsed string will be placed here
130 * @base: The number base to use
131 */
Harvey Harrison22d27052008-10-16 13:40:35 -0700132long long simple_strtoll(const char *cp, char **endp, unsigned int base)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133{
134 if(*cp=='-')
Harvey Harrison22d27052008-10-16 13:40:35 -0700135 return -simple_strtoull(cp + 1, endp, base);
136 return simple_strtoull(cp, endp, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137}
138
Yi Yang06b2a762008-02-08 04:21:57 -0800139/**
140 * strict_strtoul - convert a string to an unsigned long strictly
141 * @cp: The string to be converted
142 * @base: The number base to use
143 * @res: The converted result value
144 *
145 * strict_strtoul converts a string to an unsigned long only if the
146 * string is really an unsigned long string, any string containing
147 * any invalid char at the tail will be rejected and -EINVAL is returned,
148 * only a newline char at the tail is acceptible because people generally
149 * change a module parameter in the following way:
150 *
151 * echo 1024 > /sys/module/e1000/parameters/copybreak
152 *
153 * echo will append a newline to the tail.
154 *
155 * It returns 0 if conversion is successful and *res is set to the converted
156 * value, otherwise it returns -EINVAL and *res is set to 0.
157 *
158 * simple_strtoul just ignores the successive invalid characters and
159 * return the converted value of prefix part of the string.
160 */
Harvey Harrison9d85db22008-10-16 13:40:35 -0700161int strict_strtoul(const char *cp, unsigned int base, unsigned long *res)
162{
163 char *tail;
164 unsigned long val;
165 size_t len;
166
167 *res = 0;
168 len = strlen(cp);
169 if (len == 0)
170 return -EINVAL;
171
172 val = simple_strtoul(cp, &tail, base);
Pavel Macheke899aa82009-01-06 14:40:53 -0800173 if (tail == cp)
174 return -EINVAL;
Harvey Harrison9d85db22008-10-16 13:40:35 -0700175 if ((*tail == '\0') ||
176 ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {
177 *res = val;
178 return 0;
179 }
180
181 return -EINVAL;
182}
183EXPORT_SYMBOL(strict_strtoul);
Yi Yang06b2a762008-02-08 04:21:57 -0800184
185/**
186 * strict_strtol - convert a string to a long strictly
187 * @cp: The string to be converted
188 * @base: The number base to use
189 * @res: The converted result value
190 *
191 * strict_strtol is similiar to strict_strtoul, but it allows the first
192 * character of a string is '-'.
193 *
194 * It returns 0 if conversion is successful and *res is set to the converted
195 * value, otherwise it returns -EINVAL and *res is set to 0.
196 */
Harvey Harrison9d85db22008-10-16 13:40:35 -0700197int strict_strtol(const char *cp, unsigned int base, long *res)
198{
199 int ret;
200 if (*cp == '-') {
201 ret = strict_strtoul(cp + 1, base, (unsigned long *)res);
202 if (!ret)
203 *res = -(*res);
204 } else {
205 ret = strict_strtoul(cp, base, (unsigned long *)res);
206 }
207
208 return ret;
209}
210EXPORT_SYMBOL(strict_strtol);
Yi Yang06b2a762008-02-08 04:21:57 -0800211
212/**
213 * strict_strtoull - convert a string to an unsigned long long strictly
214 * @cp: The string to be converted
215 * @base: The number base to use
216 * @res: The converted result value
217 *
218 * strict_strtoull converts a string to an unsigned long long only if the
219 * string is really an unsigned long long string, any string containing
220 * any invalid char at the tail will be rejected and -EINVAL is returned,
221 * only a newline char at the tail is acceptible because people generally
222 * change a module parameter in the following way:
223 *
224 * echo 1024 > /sys/module/e1000/parameters/copybreak
225 *
226 * echo will append a newline to the tail of the string.
227 *
228 * It returns 0 if conversion is successful and *res is set to the converted
229 * value, otherwise it returns -EINVAL and *res is set to 0.
230 *
231 * simple_strtoull just ignores the successive invalid characters and
232 * return the converted value of prefix part of the string.
233 */
Harvey Harrison9d85db22008-10-16 13:40:35 -0700234int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res)
235{
236 char *tail;
237 unsigned long long val;
238 size_t len;
239
240 *res = 0;
241 len = strlen(cp);
242 if (len == 0)
243 return -EINVAL;
244
245 val = simple_strtoull(cp, &tail, base);
Pavel Macheke899aa82009-01-06 14:40:53 -0800246 if (tail == cp)
247 return -EINVAL;
Harvey Harrison9d85db22008-10-16 13:40:35 -0700248 if ((*tail == '\0') ||
249 ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {
250 *res = val;
251 return 0;
252 }
253
254 return -EINVAL;
255}
256EXPORT_SYMBOL(strict_strtoull);
Yi Yang06b2a762008-02-08 04:21:57 -0800257
258/**
259 * strict_strtoll - convert a string to a long long strictly
260 * @cp: The string to be converted
261 * @base: The number base to use
262 * @res: The converted result value
263 *
264 * strict_strtoll is similiar to strict_strtoull, but it allows the first
265 * character of a string is '-'.
266 *
267 * It returns 0 if conversion is successful and *res is set to the converted
268 * value, otherwise it returns -EINVAL and *res is set to 0.
269 */
Harvey Harrison9d85db22008-10-16 13:40:35 -0700270int strict_strtoll(const char *cp, unsigned int base, long long *res)
271{
272 int ret;
273 if (*cp == '-') {
274 ret = strict_strtoull(cp + 1, base, (unsigned long long *)res);
275 if (!ret)
276 *res = -(*res);
277 } else {
278 ret = strict_strtoull(cp, base, (unsigned long long *)res);
279 }
Yi Yang06b2a762008-02-08 04:21:57 -0800280
Harvey Harrison9d85db22008-10-16 13:40:35 -0700281 return ret;
282}
Yi Yang06b2a762008-02-08 04:21:57 -0800283EXPORT_SYMBOL(strict_strtoll);
Yi Yang06b2a762008-02-08 04:21:57 -0800284
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285static int skip_atoi(const char **s)
286{
287 int i=0;
288
289 while (isdigit(**s))
290 i = i*10 + *((*s)++) - '0';
291 return i;
292}
293
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700294/* Decimal conversion is by far the most typical, and is used
295 * for /proc and /sys data. This directly impacts e.g. top performance
296 * with many processes running. We optimize it for speed
297 * using code from
298 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
299 * (with permission from the author, Douglas W. Jones). */
300
301/* Formats correctly any integer in [0,99999].
302 * Outputs from one to five digits depending on input.
303 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
304static char* put_dec_trunc(char *buf, unsigned q)
305{
306 unsigned d3, d2, d1, d0;
307 d1 = (q>>4) & 0xf;
308 d2 = (q>>8) & 0xf;
309 d3 = (q>>12);
310
311 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
312 q = (d0 * 0xcd) >> 11;
313 d0 = d0 - 10*q;
314 *buf++ = d0 + '0'; /* least significant digit */
315 d1 = q + 9*d3 + 5*d2 + d1;
316 if (d1 != 0) {
317 q = (d1 * 0xcd) >> 11;
318 d1 = d1 - 10*q;
319 *buf++ = d1 + '0'; /* next digit */
320
321 d2 = q + 2*d2;
322 if ((d2 != 0) || (d3 != 0)) {
323 q = (d2 * 0xd) >> 7;
324 d2 = d2 - 10*q;
325 *buf++ = d2 + '0'; /* next digit */
326
327 d3 = q + 4*d3;
328 if (d3 != 0) {
329 q = (d3 * 0xcd) >> 11;
330 d3 = d3 - 10*q;
331 *buf++ = d3 + '0'; /* next digit */
332 if (q != 0)
333 *buf++ = q + '0'; /* most sign. digit */
334 }
335 }
336 }
337 return buf;
338}
339/* Same with if's removed. Always emits five digits */
340static char* put_dec_full(char *buf, unsigned q)
341{
342 /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
343 /* but anyway, gcc produces better code with full-sized ints */
344 unsigned d3, d2, d1, d0;
345 d1 = (q>>4) & 0xf;
346 d2 = (q>>8) & 0xf;
347 d3 = (q>>12);
348
349 /* Possible ways to approx. divide by 10 */
350 /* gcc -O2 replaces multiply with shifts and adds */
351 // (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
352 // (x * 0x67) >> 10: 1100111
353 // (x * 0x34) >> 9: 110100 - same
354 // (x * 0x1a) >> 8: 11010 - same
355 // (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
356
357 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
358 q = (d0 * 0xcd) >> 11;
359 d0 = d0 - 10*q;
360 *buf++ = d0 + '0';
361 d1 = q + 9*d3 + 5*d2 + d1;
362 q = (d1 * 0xcd) >> 11;
363 d1 = d1 - 10*q;
364 *buf++ = d1 + '0';
365
366 d2 = q + 2*d2;
367 q = (d2 * 0xd) >> 7;
368 d2 = d2 - 10*q;
369 *buf++ = d2 + '0';
370
371 d3 = q + 4*d3;
372 q = (d3 * 0xcd) >> 11; /* - shorter code */
373 /* q = (d3 * 0x67) >> 10; - would also work */
374 d3 = d3 - 10*q;
375 *buf++ = d3 + '0';
376 *buf++ = q + '0';
377 return buf;
378}
379/* No inlining helps gcc to use registers better */
380static noinline char* put_dec(char *buf, unsigned long long num)
381{
382 while (1) {
383 unsigned rem;
384 if (num < 100000)
385 return put_dec_trunc(buf, num);
386 rem = do_div(num, 100000);
387 buf = put_dec_full(buf, rem);
388 }
389}
390
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391#define ZEROPAD 1 /* pad with zero */
392#define SIGN 2 /* unsigned/signed long */
393#define PLUS 4 /* show plus */
394#define SPACE 8 /* space if plus */
395#define LEFT 16 /* left justified */
Denys Vlasenko9b706ae2008-02-09 23:24:09 +0100396#define SMALL 32 /* Must be 32 == 0x20 */
397#define SPECIAL 64 /* 0x */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100399enum format_type {
400 FORMAT_TYPE_NONE, /* Just a string part */
401 FORMAT_TYPE_WITDH,
402 FORMAT_TYPE_PRECISION,
403 FORMAT_TYPE_CHAR,
404 FORMAT_TYPE_STR,
405 FORMAT_TYPE_PTR,
406 FORMAT_TYPE_PERCENT_CHAR,
407 FORMAT_TYPE_INVALID,
408 FORMAT_TYPE_LONG_LONG,
409 FORMAT_TYPE_ULONG,
410 FORMAT_TYPE_LONG,
411 FORMAT_TYPE_USHORT,
412 FORMAT_TYPE_SHORT,
413 FORMAT_TYPE_UINT,
414 FORMAT_TYPE_INT,
415 FORMAT_TYPE_NRCHARS,
416 FORMAT_TYPE_SIZE_T,
417 FORMAT_TYPE_PTRDIFF
418};
419
420struct printf_spec {
421 enum format_type type;
422 int flags; /* flags to number() */
423 int field_width; /* width of output field */
424 int base;
425 int precision; /* # of digits/chars */
426 int qualifier;
427};
428
429static char *number(char *buf, char *end, unsigned long long num,
430 struct printf_spec spec)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431{
Denys Vlasenko9b706ae2008-02-09 23:24:09 +0100432 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
433 static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
434
435 char tmp[66];
436 char sign;
437 char locase;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100438 int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 int i;
440
Denys Vlasenko9b706ae2008-02-09 23:24:09 +0100441 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
442 * produces same digits or (maybe lowercased) letters */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100443 locase = (spec.flags & SMALL);
444 if (spec.flags & LEFT)
445 spec.flags &= ~ZEROPAD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 sign = 0;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100447 if (spec.flags & SIGN) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 if ((signed long long) num < 0) {
449 sign = '-';
450 num = - (signed long long) num;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100451 spec.field_width--;
452 } else if (spec.flags & PLUS) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 sign = '+';
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100454 spec.field_width--;
455 } else if (spec.flags & SPACE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 sign = ' ';
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100457 spec.field_width--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 }
459 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700460 if (need_pfx) {
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100461 spec.field_width--;
462 if (spec.base == 16)
463 spec.field_width--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700465
466 /* generate full string in tmp[], in reverse order */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 i = 0;
468 if (num == 0)
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700469 tmp[i++] = '0';
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700470 /* Generic code, for any base:
471 else do {
Denys Vlasenko9b706ae2008-02-09 23:24:09 +0100472 tmp[i++] = (digits[do_div(num,base)] | locase);
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700473 } while (num != 0);
474 */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100475 else if (spec.base != 10) { /* 8 or 16 */
476 int mask = spec.base - 1;
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700477 int shift = 3;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100478 if (spec.base == 16) shift = 4;
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700479 do {
Denys Vlasenko9b706ae2008-02-09 23:24:09 +0100480 tmp[i++] = (digits[((unsigned char)num) & mask] | locase);
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700481 num >>= shift;
482 } while (num);
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700483 } else { /* base 10 */
484 i = put_dec(tmp, num) - tmp;
485 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700486
487 /* printing 100 using %2d gives "100", not "00" */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100488 if (i > spec.precision)
489 spec.precision = i;
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700490 /* leading space padding */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100491 spec.field_width -= spec.precision;
492 if (!(spec.flags & (ZEROPAD+LEFT))) {
493 while(--spec.field_width >= 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700494 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 *buf = ' ';
496 ++buf;
497 }
498 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700499 /* sign */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 if (sign) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700501 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 *buf = sign;
503 ++buf;
504 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700505 /* "0x" / "0" prefix */
506 if (need_pfx) {
507 if (buf < end)
508 *buf = '0';
509 ++buf;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100510 if (spec.base == 16) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700511 if (buf < end)
Denys Vlasenko9b706ae2008-02-09 23:24:09 +0100512 *buf = ('X' | locase);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 ++buf;
514 }
515 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700516 /* zero or space padding */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100517 if (!(spec.flags & LEFT)) {
518 char c = (spec.flags & ZEROPAD) ? '0' : ' ';
519 while (--spec.field_width >= 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700520 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 *buf = c;
522 ++buf;
523 }
524 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700525 /* hmm even more zero padding? */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100526 while (i <= --spec.precision) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700527 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 *buf = '0';
529 ++buf;
530 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700531 /* actual digits of result */
532 while (--i >= 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700533 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 *buf = tmp[i];
535 ++buf;
536 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700537 /* trailing space padding */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100538 while (--spec.field_width >= 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700539 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 *buf = ' ';
541 ++buf;
542 }
543 return buf;
544}
545
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100546static char *string(char *buf, char *end, char *s, struct printf_spec spec)
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700547{
548 int len, i;
549
550 if ((unsigned long)s < PAGE_SIZE)
551 s = "<NULL>";
552
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100553 len = strnlen(s, spec.precision);
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700554
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100555 if (!(spec.flags & LEFT)) {
556 while (len < spec.field_width--) {
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700557 if (buf < end)
558 *buf = ' ';
559 ++buf;
560 }
561 }
562 for (i = 0; i < len; ++i) {
563 if (buf < end)
564 *buf = *s;
565 ++buf; ++s;
566 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100567 while (len < spec.field_width--) {
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700568 if (buf < end)
569 *buf = ' ';
570 ++buf;
571 }
572 return buf;
573}
574
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100575static char *symbol_string(char *buf, char *end, void *ptr,
576 struct printf_spec spec)
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700577{
578 unsigned long value = (unsigned long) ptr;
579#ifdef CONFIG_KALLSYMS
580 char sym[KSYM_SYMBOL_LEN];
581 sprint_symbol(sym, value);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100582 return string(buf, end, sym, spec);
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700583#else
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100584 spec.field_width = 2*sizeof(void *);
585 spec.flags |= SPECIAL | SMALL | ZEROPAD;
586 spec.base = 16;
587 return number(buf, end, value, spec);
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700588#endif
589}
590
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100591static char *resource_string(char *buf, char *end, struct resource *res,
592 struct printf_spec spec)
Linus Torvalds332d2e72008-10-20 15:07:34 +1100593{
594#ifndef IO_RSRC_PRINTK_SIZE
595#define IO_RSRC_PRINTK_SIZE 4
596#endif
597
598#ifndef MEM_RSRC_PRINTK_SIZE
599#define MEM_RSRC_PRINTK_SIZE 8
600#endif
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100601 struct printf_spec num_spec = {
602 .base = 16,
603 .precision = -1,
604 .flags = SPECIAL | SMALL | ZEROPAD,
605 };
Linus Torvalds332d2e72008-10-20 15:07:34 +1100606 /* room for the actual numbers, the two "0x", -, [, ] and the final zero */
607 char sym[4*sizeof(resource_size_t) + 8];
608 char *p = sym, *pend = sym + sizeof(sym);
609 int size = -1;
610
611 if (res->flags & IORESOURCE_IO)
612 size = IO_RSRC_PRINTK_SIZE;
613 else if (res->flags & IORESOURCE_MEM)
614 size = MEM_RSRC_PRINTK_SIZE;
615
616 *p++ = '[';
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100617 num_spec.field_width = size;
618 p = number(p, pend, res->start, num_spec);
Linus Torvalds332d2e72008-10-20 15:07:34 +1100619 *p++ = '-';
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100620 p = number(p, pend, res->end, num_spec);
Linus Torvalds332d2e72008-10-20 15:07:34 +1100621 *p++ = ']';
622 *p = 0;
623
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100624 return string(buf, end, sym, spec);
Linus Torvalds332d2e72008-10-20 15:07:34 +1100625}
626
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100627static char *mac_address_string(char *buf, char *end, u8 *addr,
628 struct printf_spec spec)
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700629{
630 char mac_addr[6 * 3]; /* (6 * 2 hex digits), 5 colons and trailing zero */
631 char *p = mac_addr;
632 int i;
633
634 for (i = 0; i < 6; i++) {
635 p = pack_hex_byte(p, addr[i]);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100636 if (!(spec.flags & SPECIAL) && i != 5)
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700637 *p++ = ':';
638 }
639 *p = '\0';
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100640 spec.flags &= ~SPECIAL;
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700641
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100642 return string(buf, end, mac_addr, spec);
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700643}
644
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100645static char *ip6_addr_string(char *buf, char *end, u8 *addr,
646 struct printf_spec spec)
Harvey Harrison689afa72008-10-28 16:04:44 -0700647{
648 char ip6_addr[8 * 5]; /* (8 * 4 hex digits), 7 colons and trailing zero */
649 char *p = ip6_addr;
650 int i;
651
652 for (i = 0; i < 8; i++) {
653 p = pack_hex_byte(p, addr[2 * i]);
654 p = pack_hex_byte(p, addr[2 * i + 1]);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100655 if (!(spec.flags & SPECIAL) && i != 7)
Harvey Harrison689afa72008-10-28 16:04:44 -0700656 *p++ = ':';
657 }
658 *p = '\0';
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100659 spec.flags &= ~SPECIAL;
Harvey Harrison689afa72008-10-28 16:04:44 -0700660
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100661 return string(buf, end, ip6_addr, spec);
Harvey Harrison689afa72008-10-28 16:04:44 -0700662}
663
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100664static char *ip4_addr_string(char *buf, char *end, u8 *addr,
665 struct printf_spec spec)
Harvey Harrison4aa99602008-10-29 12:49:58 -0700666{
667 char ip4_addr[4 * 4]; /* (4 * 3 decimal digits), 3 dots and trailing zero */
Harvey Harrisonb9ac9982008-11-03 17:09:55 -0800668 char temp[3]; /* hold each IP quad in reverse order */
Harvey Harrison4aa99602008-10-29 12:49:58 -0700669 char *p = ip4_addr;
Harvey Harrisonb9ac9982008-11-03 17:09:55 -0800670 int i, digits;
Harvey Harrison4aa99602008-10-29 12:49:58 -0700671
672 for (i = 0; i < 4; i++) {
Harvey Harrisonb9ac9982008-11-03 17:09:55 -0800673 digits = put_dec_trunc(temp, addr[i]) - temp;
674 /* reverse the digits in the quad */
675 while (digits--)
676 *p++ = temp[digits];
Harvey Harrison4aa99602008-10-29 12:49:58 -0700677 if (i != 3)
678 *p++ = '.';
679 }
680 *p = '\0';
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100681 spec.flags &= ~SPECIAL;
Harvey Harrison4aa99602008-10-29 12:49:58 -0700682
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100683 return string(buf, end, ip4_addr, spec);
Harvey Harrison4aa99602008-10-29 12:49:58 -0700684}
685
Linus Torvalds4d8a7432008-07-06 16:24:57 -0700686/*
687 * Show a '%p' thing. A kernel extension is that the '%p' is followed
688 * by an extra set of alphanumeric characters that are extended format
689 * specifiers.
690 *
Linus Torvalds332d2e72008-10-20 15:07:34 +1100691 * Right now we handle:
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700692 *
Linus Torvalds332d2e72008-10-20 15:07:34 +1100693 * - 'F' For symbolic function descriptor pointers
694 * - 'S' For symbolic direct pointers
695 * - 'R' For a struct resource pointer, it prints the range of
696 * addresses (not the name nor the flags)
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700697 * - 'M' For a 6-byte MAC address, it prints the address in the
698 * usual colon-separated hex notation
Harvey Harrison4aa99602008-10-29 12:49:58 -0700699 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
700 * decimal for v4 and colon separated network-order 16 bit hex for v6)
701 * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
Harvey Harrison6b9a1062008-10-29 12:53:10 -0700702 * currently the same
Linus Torvalds332d2e72008-10-20 15:07:34 +1100703 *
704 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
705 * function pointers are really function descriptors, which contain a
706 * pointer to the real address.
Linus Torvalds4d8a7432008-07-06 16:24:57 -0700707 */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100708static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
709 struct printf_spec spec)
Linus Torvalds78a8bf62008-07-06 16:16:15 -0700710{
Linus Torvaldsd97106a2009-01-03 11:46:17 -0800711 if (!ptr)
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100712 return string(buf, end, "(null)", spec);
Linus Torvaldsd97106a2009-01-03 11:46:17 -0800713
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700714 switch (*fmt) {
715 case 'F':
716 ptr = dereference_function_descriptor(ptr);
717 /* Fallthrough */
718 case 'S':
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100719 return symbol_string(buf, end, ptr, spec);
Linus Torvalds332d2e72008-10-20 15:07:34 +1100720 case 'R':
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100721 return resource_string(buf, end, ptr, spec);
Harvey Harrison411c41e2008-11-25 00:40:37 -0800722 case 'm':
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100723 spec.flags |= SPECIAL;
Harvey Harrison411c41e2008-11-25 00:40:37 -0800724 /* Fallthrough */
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700725 case 'M':
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100726 return mac_address_string(buf, end, ptr, spec);
Harvey Harrison4aa99602008-10-29 12:49:58 -0700727 case 'i':
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100728 spec.flags |= SPECIAL;
Harvey Harrison4aa99602008-10-29 12:49:58 -0700729 /* Fallthrough */
730 case 'I':
731 if (fmt[1] == '6')
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100732 return ip6_addr_string(buf, end, ptr, spec);
Harvey Harrison4aa99602008-10-29 12:49:58 -0700733 if (fmt[1] == '4')
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100734 return ip4_addr_string(buf, end, ptr, spec);
735 spec.flags &= ~SPECIAL;
Harvey Harrison4aa99602008-10-29 12:49:58 -0700736 break;
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700737 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100738 spec.flags |= SMALL;
739 if (spec.field_width == -1) {
740 spec.field_width = 2*sizeof(void *);
741 spec.flags |= ZEROPAD;
Linus Torvalds78a8bf62008-07-06 16:16:15 -0700742 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100743 spec.base = 16;
744
745 return number(buf, end, (unsigned long) ptr, spec);
746}
747
748/*
749 * Helper function to decode printf style format.
750 * Each call decode a token from the format and return the
751 * number of characters read (or likely the delta where it wants
752 * to go on the next call).
753 * The decoded token is returned through the parameters
754 *
755 * 'h', 'l', or 'L' for integer fields
756 * 'z' support added 23/7/1999 S.H.
757 * 'z' changed to 'Z' --davidm 1/25/99
758 * 't' added for ptrdiff_t
759 *
760 * @fmt: the format string
761 * @type of the token returned
762 * @flags: various flags such as +, -, # tokens..
763 * @field_width: overwritten width
764 * @base: base of the number (octal, hex, ...)
765 * @precision: precision of a number
766 * @qualifier: qualifier of a number (long, size_t, ...)
767 */
768static int format_decode(const char *fmt, struct printf_spec *spec)
769{
770 const char *start = fmt;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100771
772 /* we finished early by reading the field width */
773 if (spec->type == FORMAT_TYPE_WITDH) {
774 if (spec->field_width < 0) {
775 spec->field_width = -spec->field_width;
776 spec->flags |= LEFT;
777 }
778 spec->type = FORMAT_TYPE_NONE;
779 goto precision;
780 }
781
782 /* we finished early by reading the precision */
783 if (spec->type == FORMAT_TYPE_PRECISION) {
784 if (spec->precision < 0)
785 spec->precision = 0;
786
787 spec->type = FORMAT_TYPE_NONE;
788 goto qualifier;
789 }
790
791 /* By default */
792 spec->type = FORMAT_TYPE_NONE;
793
794 for (; *fmt ; ++fmt) {
795 if (*fmt == '%')
796 break;
797 }
798
799 /* Return the current non-format string */
800 if (fmt != start || !*fmt)
801 return fmt - start;
802
803 /* Process flags */
804 spec->flags = 0;
805
806 while (1) { /* this also skips first '%' */
807 bool found = true;
808
809 ++fmt;
810
811 switch (*fmt) {
812 case '-': spec->flags |= LEFT; break;
813 case '+': spec->flags |= PLUS; break;
814 case ' ': spec->flags |= SPACE; break;
815 case '#': spec->flags |= SPECIAL; break;
816 case '0': spec->flags |= ZEROPAD; break;
817 default: found = false;
818 }
819
820 if (!found)
821 break;
822 }
823
824 /* get field width */
825 spec->field_width = -1;
826
827 if (isdigit(*fmt))
828 spec->field_width = skip_atoi(&fmt);
829 else if (*fmt == '*') {
830 /* it's the next argument */
831 spec->type = FORMAT_TYPE_WITDH;
832 return ++fmt - start;
833 }
834
835precision:
836 /* get the precision */
837 spec->precision = -1;
838 if (*fmt == '.') {
839 ++fmt;
840 if (isdigit(*fmt)) {
841 spec->precision = skip_atoi(&fmt);
842 if (spec->precision < 0)
843 spec->precision = 0;
844 } else if (*fmt == '*') {
845 /* it's the next argument */
846 spec->type = FORMAT_TYPE_WITDH;
847 return ++fmt - start;
848 }
849 }
850
851qualifier:
852 /* get the conversion qualifier */
853 spec->qualifier = -1;
854 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
855 *fmt == 'Z' || *fmt == 'z' || *fmt == 't') {
856 spec->qualifier = *fmt;
857 ++fmt;
858 if (spec->qualifier == 'l' && *fmt == 'l') {
859 spec->qualifier = 'L';
860 ++fmt;
861 }
862 }
863
864 /* default base */
865 spec->base = 10;
866 switch (*fmt) {
867 case 'c':
868 spec->type = FORMAT_TYPE_CHAR;
869 return ++fmt - start;
870
871 case 's':
872 spec->type = FORMAT_TYPE_STR;
873 return ++fmt - start;
874
875 case 'p':
876 spec->type = FORMAT_TYPE_PTR;
877 return fmt - start;
878 /* skip alnum */
879
880 case 'n':
881 spec->type = FORMAT_TYPE_NRCHARS;
882 return ++fmt - start;
883
884 case '%':
885 spec->type = FORMAT_TYPE_PERCENT_CHAR;
886 return ++fmt - start;
887
888 /* integer number formats - set up the flags and "break" */
889 case 'o':
890 spec->base = 8;
891 break;
892
893 case 'x':
894 spec->flags |= SMALL;
895
896 case 'X':
897 spec->base = 16;
898 break;
899
900 case 'd':
901 case 'i':
Frederic Weisbecker39e874f2009-03-09 21:15:04 +0100902 spec->flags |= SIGN;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100903 case 'u':
904 break;
905
906 default:
907 spec->type = FORMAT_TYPE_INVALID;
908 return fmt - start;
909 }
910
911 if (spec->qualifier == 'L')
912 spec->type = FORMAT_TYPE_LONG_LONG;
913 else if (spec->qualifier == 'l') {
Frederic Weisbecker39e874f2009-03-09 21:15:04 +0100914 if (spec->flags & SIGN)
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100915 spec->type = FORMAT_TYPE_LONG;
916 else
917 spec->type = FORMAT_TYPE_ULONG;
918 } else if (spec->qualifier == 'Z' || spec->qualifier == 'z') {
919 spec->type = FORMAT_TYPE_SIZE_T;
920 } else if (spec->qualifier == 't') {
921 spec->type = FORMAT_TYPE_PTRDIFF;
922 } else if (spec->qualifier == 'h') {
Frederic Weisbecker39e874f2009-03-09 21:15:04 +0100923 if (spec->flags & SIGN)
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100924 spec->type = FORMAT_TYPE_SHORT;
925 else
926 spec->type = FORMAT_TYPE_USHORT;
927 } else {
Frederic Weisbecker39e874f2009-03-09 21:15:04 +0100928 if (spec->flags & SIGN)
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100929 spec->type = FORMAT_TYPE_INT;
930 else
931 spec->type = FORMAT_TYPE_UINT;
932 }
933
934 return ++fmt - start;
Linus Torvalds78a8bf62008-07-06 16:16:15 -0700935}
936
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937/**
938 * vsnprintf - Format a string and place it in a buffer
939 * @buf: The buffer to place the result into
940 * @size: The size of the buffer, including the trailing null space
941 * @fmt: The format string to use
942 * @args: Arguments for the format string
943 *
Andi Kleen20036fd2008-10-15 22:02:02 -0700944 * This function follows C99 vsnprintf, but has some extensions:
945 * %pS output the name of a text symbol
946 * %pF output the name of a function pointer
Linus Torvalds332d2e72008-10-20 15:07:34 +1100947 * %pR output the address range in a struct resource
Andi Kleen20036fd2008-10-15 22:02:02 -0700948 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949 * The return value is the number of characters which would
950 * be generated for the given input, excluding the trailing
951 * '\0', as per ISO C99. If you want to have the exact
952 * number of characters written into @buf as return value
Robert P. J. Day72fd4a32007-02-10 01:45:59 -0800953 * (not including the trailing '\0'), use vscnprintf(). If the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954 * return is greater than or equal to @size, the resulting
955 * string is truncated.
956 *
957 * Call this function if you are already dealing with a va_list.
Robert P. J. Day72fd4a32007-02-10 01:45:59 -0800958 * You probably want snprintf() instead.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959 */
960int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
961{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962 unsigned long long num;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 char *str, *end, c;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100964 int read;
965 struct printf_spec spec = {0};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700967 /* Reject out-of-range values early. Large positive sizes are
968 used for unknown buffer sizes. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969 if (unlikely((int) size < 0)) {
970 /* There can be only one.. */
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700971 static char warn = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 WARN_ON(warn);
973 warn = 0;
974 return 0;
975 }
976
977 str = buf;
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700978 end = buf + size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700980 /* Make sure end is always >= buf */
981 if (end < buf) {
982 end = ((void *)-1);
983 size = end - buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 }
985
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100986 while (*fmt) {
987 const char *old_fmt = fmt;
988
989 read = format_decode(fmt, &spec);
990
991 fmt += read;
992
993 switch (spec.type) {
994 case FORMAT_TYPE_NONE: {
995 int copy = read;
996 if (str < end) {
997 if (copy > end - str)
998 copy = end - str;
999 memcpy(str, old_fmt, copy);
1000 }
1001 str += read;
1002 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003 }
1004
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001005 case FORMAT_TYPE_WITDH:
1006 spec.field_width = va_arg(args, int);
1007 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001009 case FORMAT_TYPE_PRECISION:
1010 spec.precision = va_arg(args, int);
1011 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001013 case FORMAT_TYPE_CHAR:
1014 if (!(spec.flags & LEFT)) {
1015 while (--spec.field_width > 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001016 if (str < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 *str = ' ';
1018 ++str;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001019
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001021 }
1022 c = (unsigned char) va_arg(args, int);
1023 if (str < end)
1024 *str = c;
1025 ++str;
1026 while (--spec.field_width > 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001027 if (str < end)
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001028 *str = ' ';
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 ++str;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001030 }
1031 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001033 case FORMAT_TYPE_STR:
1034 str = string(str, end, va_arg(args, char *), spec);
1035 break;
1036
1037 case FORMAT_TYPE_PTR:
1038 str = pointer(fmt+1, str, end, va_arg(args, void *),
1039 spec);
1040 while (isalnum(*fmt))
1041 fmt++;
1042 break;
1043
1044 case FORMAT_TYPE_PERCENT_CHAR:
1045 if (str < end)
1046 *str = '%';
1047 ++str;
1048 break;
1049
1050 case FORMAT_TYPE_INVALID:
1051 if (str < end)
1052 *str = '%';
1053 ++str;
1054 if (*fmt) {
1055 if (str < end)
1056 *str = *fmt;
1057 ++str;
1058 } else {
1059 --fmt;
1060 }
1061 break;
1062
1063 case FORMAT_TYPE_NRCHARS: {
1064 int qualifier = spec.qualifier;
1065
1066 if (qualifier == 'l') {
1067 long *ip = va_arg(args, long *);
1068 *ip = (str - buf);
1069 } else if (qualifier == 'Z' ||
1070 qualifier == 'z') {
1071 size_t *ip = va_arg(args, size_t *);
1072 *ip = (str - buf);
1073 } else {
1074 int *ip = va_arg(args, int *);
1075 *ip = (str - buf);
1076 }
1077 break;
1078 }
1079
1080 default:
1081 switch (spec.type) {
1082 case FORMAT_TYPE_LONG_LONG:
1083 num = va_arg(args, long long);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084 break;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001085 case FORMAT_TYPE_ULONG:
1086 num = va_arg(args, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087 break;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001088 case FORMAT_TYPE_LONG:
1089 num = va_arg(args, long);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090 break;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001091 case FORMAT_TYPE_SIZE_T:
1092 num = va_arg(args, size_t);
1093 break;
1094 case FORMAT_TYPE_PTRDIFF:
1095 num = va_arg(args, ptrdiff_t);
1096 break;
1097 case FORMAT_TYPE_USHORT:
1098 num = (unsigned short) va_arg(args, int);
1099 break;
1100 case FORMAT_TYPE_SHORT:
1101 num = (short) va_arg(args, int);
1102 break;
Frederic Weisbecker39e874f2009-03-09 21:15:04 +01001103 case FORMAT_TYPE_INT:
1104 num = (int) va_arg(args, int);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001105 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 default:
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001107 num = va_arg(args, unsigned int);
1108 }
1109
1110 str = number(str, end, num, spec);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001113
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001114 if (size > 0) {
1115 if (str < end)
1116 *str = '\0';
1117 else
Linus Torvalds0a6047e2006-06-28 17:09:34 -07001118 end[-1] = '\0';
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001119 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001120
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001121 /* the trailing null byte doesn't count towards the total */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122 return str-buf;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001123
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125EXPORT_SYMBOL(vsnprintf);
1126
1127/**
1128 * vscnprintf - Format a string and place it in a buffer
1129 * @buf: The buffer to place the result into
1130 * @size: The size of the buffer, including the trailing null space
1131 * @fmt: The format string to use
1132 * @args: Arguments for the format string
1133 *
1134 * The return value is the number of characters which have been written into
1135 * the @buf not including the trailing '\0'. If @size is <= 0 the function
1136 * returns 0.
1137 *
1138 * Call this function if you are already dealing with a va_list.
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001139 * You probably want scnprintf() instead.
Andi Kleen20036fd2008-10-15 22:02:02 -07001140 *
1141 * See the vsnprintf() documentation for format string extensions over C99.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142 */
1143int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
1144{
1145 int i;
1146
1147 i=vsnprintf(buf,size,fmt,args);
1148 return (i >= size) ? (size - 1) : i;
1149}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150EXPORT_SYMBOL(vscnprintf);
1151
1152/**
1153 * snprintf - Format a string and place it in a buffer
1154 * @buf: The buffer to place the result into
1155 * @size: The size of the buffer, including the trailing null space
1156 * @fmt: The format string to use
1157 * @...: Arguments for the format string
1158 *
1159 * The return value is the number of characters which would be
1160 * generated for the given input, excluding the trailing null,
1161 * as per ISO C99. If the return is greater than or equal to
1162 * @size, the resulting string is truncated.
Andi Kleen20036fd2008-10-15 22:02:02 -07001163 *
1164 * See the vsnprintf() documentation for format string extensions over C99.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165 */
1166int snprintf(char * buf, size_t size, const char *fmt, ...)
1167{
1168 va_list args;
1169 int i;
1170
1171 va_start(args, fmt);
1172 i=vsnprintf(buf,size,fmt,args);
1173 va_end(args);
1174 return i;
1175}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176EXPORT_SYMBOL(snprintf);
1177
1178/**
1179 * scnprintf - Format a string and place it in a buffer
1180 * @buf: The buffer to place the result into
1181 * @size: The size of the buffer, including the trailing null space
1182 * @fmt: The format string to use
1183 * @...: Arguments for the format string
1184 *
1185 * The return value is the number of characters written into @buf not including
Martin Peschkeea6f3282007-02-12 00:51:56 -08001186 * the trailing '\0'. If @size is <= 0 the function returns 0.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187 */
1188
1189int scnprintf(char * buf, size_t size, const char *fmt, ...)
1190{
1191 va_list args;
1192 int i;
1193
1194 va_start(args, fmt);
1195 i = vsnprintf(buf, size, fmt, args);
1196 va_end(args);
1197 return (i >= size) ? (size - 1) : i;
1198}
1199EXPORT_SYMBOL(scnprintf);
1200
1201/**
1202 * vsprintf - Format a string and place it in a buffer
1203 * @buf: The buffer to place the result into
1204 * @fmt: The format string to use
1205 * @args: Arguments for the format string
1206 *
1207 * The function returns the number of characters written
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001208 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209 * buffer overflows.
1210 *
1211 * Call this function if you are already dealing with a va_list.
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001212 * You probably want sprintf() instead.
Andi Kleen20036fd2008-10-15 22:02:02 -07001213 *
1214 * See the vsnprintf() documentation for format string extensions over C99.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215 */
1216int vsprintf(char *buf, const char *fmt, va_list args)
1217{
1218 return vsnprintf(buf, INT_MAX, fmt, args);
1219}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220EXPORT_SYMBOL(vsprintf);
1221
1222/**
1223 * sprintf - Format a string and place it in a buffer
1224 * @buf: The buffer to place the result into
1225 * @fmt: The format string to use
1226 * @...: Arguments for the format string
1227 *
1228 * The function returns the number of characters written
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001229 * into @buf. Use snprintf() or scnprintf() in order to avoid
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230 * buffer overflows.
Andi Kleen20036fd2008-10-15 22:02:02 -07001231 *
1232 * See the vsnprintf() documentation for format string extensions over C99.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233 */
1234int sprintf(char * buf, const char *fmt, ...)
1235{
1236 va_list args;
1237 int i;
1238
1239 va_start(args, fmt);
1240 i=vsnprintf(buf, INT_MAX, fmt, args);
1241 va_end(args);
1242 return i;
1243}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244EXPORT_SYMBOL(sprintf);
1245
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001246#ifdef CONFIG_BINARY_PRINTF
1247/*
1248 * bprintf service:
1249 * vbin_printf() - VA arguments to binary data
1250 * bstr_printf() - Binary data to text string
1251 */
1252
1253/**
1254 * vbin_printf - Parse a format string and place args' binary value in a buffer
1255 * @bin_buf: The buffer to place args' binary value
1256 * @size: The size of the buffer(by words(32bits), not characters)
1257 * @fmt: The format string to use
1258 * @args: Arguments for the format string
1259 *
1260 * The format follows C99 vsnprintf, except %n is ignored, and its argument
1261 * is skiped.
1262 *
1263 * The return value is the number of words(32bits) which would be generated for
1264 * the given input.
1265 *
1266 * NOTE:
1267 * If the return value is greater than @size, the resulting bin_buf is NOT
1268 * valid for bstr_printf().
1269 */
1270int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
1271{
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001272 struct printf_spec spec = {0};
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001273 char *str, *end;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001274 int read;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001275
1276 str = (char *)bin_buf;
1277 end = (char *)(bin_buf + size);
1278
1279#define save_arg(type) \
1280do { \
1281 if (sizeof(type) == 8) { \
1282 unsigned long long value; \
1283 str = PTR_ALIGN(str, sizeof(u32)); \
1284 value = va_arg(args, unsigned long long); \
1285 if (str + sizeof(type) <= end) { \
1286 *(u32 *)str = *(u32 *)&value; \
1287 *(u32 *)(str + 4) = *((u32 *)&value + 1); \
1288 } \
1289 } else { \
1290 unsigned long value; \
1291 str = PTR_ALIGN(str, sizeof(type)); \
1292 value = va_arg(args, int); \
1293 if (str + sizeof(type) <= end) \
1294 *(typeof(type) *)str = (type)value; \
1295 } \
1296 str += sizeof(type); \
1297} while (0)
1298
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001299
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001300 while (*fmt) {
1301 read = format_decode(fmt, &spec);
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001302
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001303 fmt += read;
1304
1305 switch (spec.type) {
1306 case FORMAT_TYPE_NONE:
1307 break;
1308
1309 case FORMAT_TYPE_WITDH:
1310 case FORMAT_TYPE_PRECISION:
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001311 save_arg(int);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001312 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001313
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001314 case FORMAT_TYPE_CHAR:
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001315 save_arg(char);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001316 break;
1317
1318 case FORMAT_TYPE_STR: {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001319 const char *save_str = va_arg(args, char *);
1320 size_t len;
1321 if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
1322 || (unsigned long)save_str < PAGE_SIZE)
1323 save_str = "<NULL>";
1324 len = strlen(save_str);
1325 if (str + len + 1 < end)
1326 memcpy(str, save_str, len + 1);
1327 str += len + 1;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001328 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001329 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001330
1331 case FORMAT_TYPE_PTR:
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001332 save_arg(void *);
1333 /* skip all alphanumeric pointer suffixes */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001334 while (isalnum(*fmt))
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001335 fmt++;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001336 break;
1337
1338 case FORMAT_TYPE_PERCENT_CHAR:
1339 break;
1340
1341 case FORMAT_TYPE_INVALID:
1342 if (!*fmt)
1343 --fmt;
1344 break;
1345
1346 case FORMAT_TYPE_NRCHARS: {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001347 /* skip %n 's argument */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001348 int qualifier = spec.qualifier;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001349 void *skip_arg;
1350 if (qualifier == 'l')
1351 skip_arg = va_arg(args, long *);
1352 else if (qualifier == 'Z' || qualifier == 'z')
1353 skip_arg = va_arg(args, size_t *);
1354 else
1355 skip_arg = va_arg(args, int *);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001356 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001357 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001358
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001359 default:
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001360 switch (spec.type) {
1361
1362 case FORMAT_TYPE_LONG_LONG:
1363 save_arg(long long);
1364 break;
1365 case FORMAT_TYPE_ULONG:
1366 case FORMAT_TYPE_LONG:
1367 save_arg(unsigned long);
1368 break;
1369 case FORMAT_TYPE_SIZE_T:
1370 save_arg(size_t);
1371 break;
1372 case FORMAT_TYPE_PTRDIFF:
1373 save_arg(ptrdiff_t);
1374 break;
1375 case FORMAT_TYPE_USHORT:
1376 case FORMAT_TYPE_SHORT:
1377 save_arg(short);
1378 break;
1379 default:
1380 save_arg(int);
1381 }
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001382 }
1383 }
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001384 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001385
1386#undef save_arg
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001387}
1388EXPORT_SYMBOL_GPL(vbin_printf);
1389
1390/**
1391 * bstr_printf - Format a string from binary arguments and place it in a buffer
1392 * @buf: The buffer to place the result into
1393 * @size: The size of the buffer, including the trailing null space
1394 * @fmt: The format string to use
1395 * @bin_buf: Binary arguments for the format string
1396 *
1397 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
1398 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
1399 * a binary buffer that generated by vbin_printf.
1400 *
1401 * The format follows C99 vsnprintf, but has some extensions:
1402 * %pS output the name of a text symbol
1403 * %pF output the name of a function pointer
1404 * %pR output the address range in a struct resource
1405 * %n is ignored
1406 *
1407 * The return value is the number of characters which would
1408 * be generated for the given input, excluding the trailing
1409 * '\0', as per ISO C99. If you want to have the exact
1410 * number of characters written into @buf as return value
1411 * (not including the trailing '\0'), use vscnprintf(). If the
1412 * return is greater than or equal to @size, the resulting
1413 * string is truncated.
1414 */
1415int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
1416{
1417 unsigned long long num;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001418 char *str, *end, c;
1419 const char *args = (const char *)bin_buf;
1420
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001421 struct printf_spec spec = {0};
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001422
1423 if (unlikely((int) size < 0)) {
1424 /* There can be only one.. */
1425 static char warn = 1;
1426 WARN_ON(warn);
1427 warn = 0;
1428 return 0;
1429 }
1430
1431 str = buf;
1432 end = buf + size;
1433
1434#define get_arg(type) \
1435({ \
1436 typeof(type) value; \
1437 if (sizeof(type) == 8) { \
1438 args = PTR_ALIGN(args, sizeof(u32)); \
1439 *(u32 *)&value = *(u32 *)args; \
1440 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
1441 } else { \
1442 args = PTR_ALIGN(args, sizeof(type)); \
1443 value = *(typeof(type) *)args; \
1444 } \
1445 args += sizeof(type); \
1446 value; \
1447})
1448
1449 /* Make sure end is always >= buf */
1450 if (end < buf) {
1451 end = ((void *)-1);
1452 size = end - buf;
1453 }
1454
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001455 while (*fmt) {
1456 int read;
1457 const char *old_fmt = fmt;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001458
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001459 read = format_decode(fmt, &spec);
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001460
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001461 fmt += read;
1462
1463 switch (spec.type) {
1464 case FORMAT_TYPE_NONE: {
1465 int copy = read;
1466 if (str < end) {
1467 if (copy > end - str)
1468 copy = end - str;
1469 memcpy(str, old_fmt, copy);
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001470 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001471 str += read;
1472 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001473 }
1474
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001475 case FORMAT_TYPE_WITDH:
1476 spec.field_width = get_arg(int);
1477 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001478
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001479 case FORMAT_TYPE_PRECISION:
1480 spec.precision = get_arg(int);
1481 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001482
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001483 case FORMAT_TYPE_CHAR:
1484 if (!(spec.flags & LEFT)) {
1485 while (--spec.field_width > 0) {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001486 if (str < end)
1487 *str = ' ';
1488 ++str;
1489 }
1490 }
1491 c = (unsigned char) get_arg(char);
1492 if (str < end)
1493 *str = c;
1494 ++str;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001495 while (--spec.field_width > 0) {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001496 if (str < end)
1497 *str = ' ';
1498 ++str;
1499 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001500 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001501
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001502 case FORMAT_TYPE_STR: {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001503 const char *str_arg = args;
1504 size_t len = strlen(str_arg);
1505 args += len + 1;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001506 str = string(str, end, (char *)str_arg, spec);
1507 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001508 }
1509
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001510 case FORMAT_TYPE_PTR:
1511 str = pointer(fmt+1, str, end, get_arg(void *), spec);
1512 while (isalnum(*fmt))
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001513 fmt++;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001514 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001515
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001516 case FORMAT_TYPE_PERCENT_CHAR:
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001517 if (str < end)
1518 *str = '%';
1519 ++str;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001520 break;
1521
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001522 case FORMAT_TYPE_INVALID:
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001523 if (str < end)
1524 *str = '%';
1525 ++str;
1526 if (*fmt) {
1527 if (str < end)
1528 *str = *fmt;
1529 ++str;
1530 } else {
1531 --fmt;
1532 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001533 break;
1534
1535 case FORMAT_TYPE_NRCHARS:
1536 /* skip */
1537 break;
1538
1539 default:
1540 switch (spec.type) {
1541
1542 case FORMAT_TYPE_LONG_LONG:
1543 num = get_arg(long long);
1544 break;
1545 case FORMAT_TYPE_ULONG:
1546 num = get_arg(unsigned long);
1547 break;
1548 case FORMAT_TYPE_LONG:
1549 num = get_arg(unsigned long);
1550 break;
1551 case FORMAT_TYPE_SIZE_T:
1552 num = get_arg(size_t);
1553 break;
1554 case FORMAT_TYPE_PTRDIFF:
1555 num = get_arg(ptrdiff_t);
1556 break;
1557 case FORMAT_TYPE_USHORT:
1558 num = get_arg(unsigned short);
1559 break;
1560 case FORMAT_TYPE_SHORT:
1561 num = get_arg(short);
1562 break;
1563 case FORMAT_TYPE_UINT:
1564 num = get_arg(unsigned int);
1565 break;
1566 default:
1567 num = get_arg(int);
1568 }
1569
1570 str = number(str, end, num, spec);
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001571 }
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001572 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001573
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001574 if (size > 0) {
1575 if (str < end)
1576 *str = '\0';
1577 else
1578 end[-1] = '\0';
1579 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001580
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001581#undef get_arg
1582
1583 /* the trailing null byte doesn't count towards the total */
1584 return str - buf;
1585}
1586EXPORT_SYMBOL_GPL(bstr_printf);
1587
1588/**
1589 * bprintf - Parse a format string and place args' binary value in a buffer
1590 * @bin_buf: The buffer to place args' binary value
1591 * @size: The size of the buffer(by words(32bits), not characters)
1592 * @fmt: The format string to use
1593 * @...: Arguments for the format string
1594 *
1595 * The function returns the number of words(u32) written
1596 * into @bin_buf.
1597 */
1598int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
1599{
1600 va_list args;
1601 int ret;
1602
1603 va_start(args, fmt);
1604 ret = vbin_printf(bin_buf, size, fmt, args);
1605 va_end(args);
1606 return ret;
1607}
1608EXPORT_SYMBOL_GPL(bprintf);
1609
1610#endif /* CONFIG_BINARY_PRINTF */
1611
Linus Torvalds1da177e2005-04-16 15:20:36 -07001612/**
1613 * vsscanf - Unformat a buffer into a list of arguments
1614 * @buf: input buffer
1615 * @fmt: format of buffer
1616 * @args: arguments
1617 */
1618int vsscanf(const char * buf, const char * fmt, va_list args)
1619{
1620 const char *str = buf;
1621 char *next;
1622 char digit;
1623 int num = 0;
1624 int qualifier;
1625 int base;
1626 int field_width;
1627 int is_sign = 0;
1628
1629 while(*fmt && *str) {
1630 /* skip any white space in format */
1631 /* white space in format matchs any amount of
1632 * white space, including none, in the input.
1633 */
1634 if (isspace(*fmt)) {
1635 while (isspace(*fmt))
1636 ++fmt;
1637 while (isspace(*str))
1638 ++str;
1639 }
1640
1641 /* anything that is not a conversion must match exactly */
1642 if (*fmt != '%' && *fmt) {
1643 if (*fmt++ != *str++)
1644 break;
1645 continue;
1646 }
1647
1648 if (!*fmt)
1649 break;
1650 ++fmt;
1651
1652 /* skip this conversion.
1653 * advance both strings to next white space
1654 */
1655 if (*fmt == '*') {
1656 while (!isspace(*fmt) && *fmt)
1657 fmt++;
1658 while (!isspace(*str) && *str)
1659 str++;
1660 continue;
1661 }
1662
1663 /* get field width */
1664 field_width = -1;
1665 if (isdigit(*fmt))
1666 field_width = skip_atoi(&fmt);
1667
1668 /* get conversion qualifier */
1669 qualifier = -1;
1670 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
1671 *fmt == 'Z' || *fmt == 'z') {
1672 qualifier = *fmt++;
1673 if (unlikely(qualifier == *fmt)) {
1674 if (qualifier == 'h') {
1675 qualifier = 'H';
1676 fmt++;
1677 } else if (qualifier == 'l') {
1678 qualifier = 'L';
1679 fmt++;
1680 }
1681 }
1682 }
1683 base = 10;
1684 is_sign = 0;
1685
1686 if (!*fmt || !*str)
1687 break;
1688
1689 switch(*fmt++) {
1690 case 'c':
1691 {
1692 char *s = (char *) va_arg(args,char*);
1693 if (field_width == -1)
1694 field_width = 1;
1695 do {
1696 *s++ = *str++;
1697 } while (--field_width > 0 && *str);
1698 num++;
1699 }
1700 continue;
1701 case 's':
1702 {
1703 char *s = (char *) va_arg(args, char *);
1704 if(field_width == -1)
1705 field_width = INT_MAX;
1706 /* first, skip leading white space in buffer */
1707 while (isspace(*str))
1708 str++;
1709
1710 /* now copy until next white space */
1711 while (*str && !isspace(*str) && field_width--) {
1712 *s++ = *str++;
1713 }
1714 *s = '\0';
1715 num++;
1716 }
1717 continue;
1718 case 'n':
1719 /* return number of characters read so far */
1720 {
1721 int *i = (int *)va_arg(args,int*);
1722 *i = str - buf;
1723 }
1724 continue;
1725 case 'o':
1726 base = 8;
1727 break;
1728 case 'x':
1729 case 'X':
1730 base = 16;
1731 break;
1732 case 'i':
1733 base = 0;
1734 case 'd':
1735 is_sign = 1;
1736 case 'u':
1737 break;
1738 case '%':
1739 /* looking for '%' in str */
1740 if (*str++ != '%')
1741 return num;
1742 continue;
1743 default:
1744 /* invalid format; stop here */
1745 return num;
1746 }
1747
1748 /* have some sort of integer conversion.
1749 * first, skip white space in buffer.
1750 */
1751 while (isspace(*str))
1752 str++;
1753
1754 digit = *str;
1755 if (is_sign && digit == '-')
1756 digit = *(str + 1);
1757
1758 if (!digit
1759 || (base == 16 && !isxdigit(digit))
1760 || (base == 10 && !isdigit(digit))
1761 || (base == 8 && (!isdigit(digit) || digit > '7'))
1762 || (base == 0 && !isdigit(digit)))
1763 break;
1764
1765 switch(qualifier) {
1766 case 'H': /* that's 'hh' in format */
1767 if (is_sign) {
1768 signed char *s = (signed char *) va_arg(args,signed char *);
1769 *s = (signed char) simple_strtol(str,&next,base);
1770 } else {
1771 unsigned char *s = (unsigned char *) va_arg(args, unsigned char *);
1772 *s = (unsigned char) simple_strtoul(str, &next, base);
1773 }
1774 break;
1775 case 'h':
1776 if (is_sign) {
1777 short *s = (short *) va_arg(args,short *);
1778 *s = (short) simple_strtol(str,&next,base);
1779 } else {
1780 unsigned short *s = (unsigned short *) va_arg(args, unsigned short *);
1781 *s = (unsigned short) simple_strtoul(str, &next, base);
1782 }
1783 break;
1784 case 'l':
1785 if (is_sign) {
1786 long *l = (long *) va_arg(args,long *);
1787 *l = simple_strtol(str,&next,base);
1788 } else {
1789 unsigned long *l = (unsigned long*) va_arg(args,unsigned long*);
1790 *l = simple_strtoul(str,&next,base);
1791 }
1792 break;
1793 case 'L':
1794 if (is_sign) {
1795 long long *l = (long long*) va_arg(args,long long *);
1796 *l = simple_strtoll(str,&next,base);
1797 } else {
1798 unsigned long long *l = (unsigned long long*) va_arg(args,unsigned long long*);
1799 *l = simple_strtoull(str,&next,base);
1800 }
1801 break;
1802 case 'Z':
1803 case 'z':
1804 {
1805 size_t *s = (size_t*) va_arg(args,size_t*);
1806 *s = (size_t) simple_strtoul(str,&next,base);
1807 }
1808 break;
1809 default:
1810 if (is_sign) {
1811 int *i = (int *) va_arg(args, int*);
1812 *i = (int) simple_strtol(str,&next,base);
1813 } else {
1814 unsigned int *i = (unsigned int*) va_arg(args, unsigned int*);
1815 *i = (unsigned int) simple_strtoul(str,&next,base);
1816 }
1817 break;
1818 }
1819 num++;
1820
1821 if (!next)
1822 break;
1823 str = next;
1824 }
Johannes Bergc6b40d12007-05-08 00:27:20 -07001825
1826 /*
1827 * Now we've come all the way through so either the input string or the
1828 * format ended. In the former case, there can be a %n at the current
1829 * position in the format that needs to be filled.
1830 */
1831 if (*fmt == '%' && *(fmt + 1) == 'n') {
1832 int *p = (int *)va_arg(args, int *);
1833 *p = str - buf;
1834 }
1835
Linus Torvalds1da177e2005-04-16 15:20:36 -07001836 return num;
1837}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001838EXPORT_SYMBOL(vsscanf);
1839
1840/**
1841 * sscanf - Unformat a buffer into a list of arguments
1842 * @buf: input buffer
1843 * @fmt: formatting of buffer
1844 * @...: resulting arguments
1845 */
1846int sscanf(const char * buf, const char * fmt, ...)
1847{
1848 va_list args;
1849 int i;
1850
1851 va_start(args,fmt);
1852 i = vsscanf(buf,fmt,args);
1853 va_end(args);
1854 return i;
1855}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001856EXPORT_SYMBOL(sscanf);