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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>
Joe Perches8a27f7c2009-08-17 12:29:44 +000028#include <net/addrconf.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Tim Schmielau4e57b682005-10-30 15:03:48 -080030#include <asm/page.h> /* for PAGE_SIZE */
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <asm/div64.h>
James Bottomleydeac93d2008-09-03 20:43:36 -050032#include <asm/sections.h> /* for dereference_function_descriptor() */
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
Denys Vlasenko9b706ae2008-02-09 23:24:09 +010034/* Works only for digits and letters, but small and fast */
35#define TOLOWER(x) ((x) | 0x20)
36
Harvey Harrisonaa46a632008-10-16 13:40:34 -070037static unsigned int simple_guess_base(const char *cp)
38{
39 if (cp[0] == '0') {
40 if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2]))
41 return 16;
42 else
43 return 8;
44 } else {
45 return 10;
46 }
47}
48
Linus Torvalds1da177e2005-04-16 15:20:36 -070049/**
50 * simple_strtoul - convert a string to an unsigned long
51 * @cp: The start of the string
52 * @endp: A pointer to the end of the parsed string will be placed here
53 * @base: The number base to use
54 */
Harvey Harrison22d27052008-10-16 13:40:35 -070055unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
Linus Torvalds1da177e2005-04-16 15:20:36 -070056{
Harvey Harrisonaa46a632008-10-16 13:40:34 -070057 unsigned long result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
Harvey Harrisonaa46a632008-10-16 13:40:34 -070059 if (!base)
60 base = simple_guess_base(cp);
61
62 if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x')
63 cp += 2;
64
65 while (isxdigit(*cp)) {
66 unsigned int value;
67
68 value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10;
69 if (value >= base)
70 break;
71 result = result * base + value;
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 cp++;
73 }
Harvey Harrisonaa46a632008-10-16 13:40:34 -070074
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 if (endp)
76 *endp = (char *)cp;
77 return result;
78}
Linus Torvalds1da177e2005-04-16 15:20:36 -070079EXPORT_SYMBOL(simple_strtoul);
80
81/**
82 * simple_strtol - convert a string to a signed long
83 * @cp: The start of the string
84 * @endp: A pointer to the end of the parsed string will be placed here
85 * @base: The number base to use
86 */
Harvey Harrison22d27052008-10-16 13:40:35 -070087long simple_strtol(const char *cp, char **endp, unsigned int base)
Linus Torvalds1da177e2005-04-16 15:20:36 -070088{
Harvey Harrison22d27052008-10-16 13:40:35 -070089 if(*cp == '-')
90 return -simple_strtoul(cp + 1, endp, base);
91 return simple_strtoul(cp, endp, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092}
Linus Torvalds1da177e2005-04-16 15:20:36 -070093EXPORT_SYMBOL(simple_strtol);
94
95/**
96 * simple_strtoull - convert a string to an unsigned long long
97 * @cp: The start of the string
98 * @endp: A pointer to the end of the parsed string will be placed here
99 * @base: The number base to use
100 */
Harvey Harrison22d27052008-10-16 13:40:35 -0700101unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102{
Harvey Harrisonaa46a632008-10-16 13:40:34 -0700103 unsigned long long result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104
Harvey Harrisonaa46a632008-10-16 13:40:34 -0700105 if (!base)
106 base = simple_guess_base(cp);
107
108 if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x')
109 cp += 2;
110
111 while (isxdigit(*cp)) {
112 unsigned int value;
113
114 value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10;
115 if (value >= base)
116 break;
117 result = result * base + value;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 cp++;
119 }
Harvey Harrisonaa46a632008-10-16 13:40:34 -0700120
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 if (endp)
122 *endp = (char *)cp;
123 return result;
124}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125EXPORT_SYMBOL(simple_strtoull);
126
127/**
128 * simple_strtoll - convert a string to a signed long long
129 * @cp: The start of the string
130 * @endp: A pointer to the end of the parsed string will be placed here
131 * @base: The number base to use
132 */
Harvey Harrison22d27052008-10-16 13:40:35 -0700133long long simple_strtoll(const char *cp, char **endp, unsigned int base)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134{
135 if(*cp=='-')
Harvey Harrison22d27052008-10-16 13:40:35 -0700136 return -simple_strtoull(cp + 1, endp, base);
137 return simple_strtoull(cp, endp, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138}
139
Yi Yang06b2a762008-02-08 04:21:57 -0800140/**
141 * strict_strtoul - convert a string to an unsigned long strictly
142 * @cp: The string to be converted
143 * @base: The number base to use
144 * @res: The converted result value
145 *
146 * strict_strtoul converts a string to an unsigned long only if the
147 * string is really an unsigned long string, any string containing
148 * any invalid char at the tail will be rejected and -EINVAL is returned,
149 * only a newline char at the tail is acceptible because people generally
150 * change a module parameter in the following way:
151 *
152 * echo 1024 > /sys/module/e1000/parameters/copybreak
153 *
154 * echo will append a newline to the tail.
155 *
156 * It returns 0 if conversion is successful and *res is set to the converted
157 * value, otherwise it returns -EINVAL and *res is set to 0.
158 *
159 * simple_strtoul just ignores the successive invalid characters and
160 * return the converted value of prefix part of the string.
161 */
Harvey Harrison9d85db22008-10-16 13:40:35 -0700162int strict_strtoul(const char *cp, unsigned int base, unsigned long *res)
163{
164 char *tail;
165 unsigned long val;
166 size_t len;
167
168 *res = 0;
169 len = strlen(cp);
170 if (len == 0)
171 return -EINVAL;
172
173 val = simple_strtoul(cp, &tail, base);
Pavel Macheke899aa82009-01-06 14:40:53 -0800174 if (tail == cp)
175 return -EINVAL;
Harvey Harrison9d85db22008-10-16 13:40:35 -0700176 if ((*tail == '\0') ||
177 ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {
178 *res = val;
179 return 0;
180 }
181
182 return -EINVAL;
183}
184EXPORT_SYMBOL(strict_strtoul);
Yi Yang06b2a762008-02-08 04:21:57 -0800185
186/**
187 * strict_strtol - convert a string to a long strictly
188 * @cp: The string to be converted
189 * @base: The number base to use
190 * @res: The converted result value
191 *
192 * strict_strtol is similiar to strict_strtoul, but it allows the first
193 * character of a string is '-'.
194 *
195 * It returns 0 if conversion is successful and *res is set to the converted
196 * value, otherwise it returns -EINVAL and *res is set to 0.
197 */
Harvey Harrison9d85db22008-10-16 13:40:35 -0700198int strict_strtol(const char *cp, unsigned int base, long *res)
199{
200 int ret;
201 if (*cp == '-') {
202 ret = strict_strtoul(cp + 1, base, (unsigned long *)res);
203 if (!ret)
204 *res = -(*res);
205 } else {
206 ret = strict_strtoul(cp, base, (unsigned long *)res);
207 }
208
209 return ret;
210}
211EXPORT_SYMBOL(strict_strtol);
Yi Yang06b2a762008-02-08 04:21:57 -0800212
213/**
214 * strict_strtoull - convert a string to an unsigned long long strictly
215 * @cp: The string to be converted
216 * @base: The number base to use
217 * @res: The converted result value
218 *
219 * strict_strtoull converts a string to an unsigned long long only if the
220 * string is really an unsigned long long string, any string containing
221 * any invalid char at the tail will be rejected and -EINVAL is returned,
222 * only a newline char at the tail is acceptible because people generally
223 * change a module parameter in the following way:
224 *
225 * echo 1024 > /sys/module/e1000/parameters/copybreak
226 *
227 * echo will append a newline to the tail of the string.
228 *
229 * It returns 0 if conversion is successful and *res is set to the converted
230 * value, otherwise it returns -EINVAL and *res is set to 0.
231 *
232 * simple_strtoull just ignores the successive invalid characters and
233 * return the converted value of prefix part of the string.
234 */
Harvey Harrison9d85db22008-10-16 13:40:35 -0700235int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res)
236{
237 char *tail;
238 unsigned long long val;
239 size_t len;
240
241 *res = 0;
242 len = strlen(cp);
243 if (len == 0)
244 return -EINVAL;
245
246 val = simple_strtoull(cp, &tail, base);
Pavel Macheke899aa82009-01-06 14:40:53 -0800247 if (tail == cp)
248 return -EINVAL;
Harvey Harrison9d85db22008-10-16 13:40:35 -0700249 if ((*tail == '\0') ||
250 ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {
251 *res = val;
252 return 0;
253 }
254
255 return -EINVAL;
256}
257EXPORT_SYMBOL(strict_strtoull);
Yi Yang06b2a762008-02-08 04:21:57 -0800258
259/**
260 * strict_strtoll - convert a string to a long long strictly
261 * @cp: The string to be converted
262 * @base: The number base to use
263 * @res: The converted result value
264 *
265 * strict_strtoll is similiar to strict_strtoull, but it allows the first
266 * character of a string is '-'.
267 *
268 * It returns 0 if conversion is successful and *res is set to the converted
269 * value, otherwise it returns -EINVAL and *res is set to 0.
270 */
Harvey Harrison9d85db22008-10-16 13:40:35 -0700271int strict_strtoll(const char *cp, unsigned int base, long long *res)
272{
273 int ret;
274 if (*cp == '-') {
275 ret = strict_strtoull(cp + 1, base, (unsigned long long *)res);
276 if (!ret)
277 *res = -(*res);
278 } else {
279 ret = strict_strtoull(cp, base, (unsigned long long *)res);
280 }
Yi Yang06b2a762008-02-08 04:21:57 -0800281
Harvey Harrison9d85db22008-10-16 13:40:35 -0700282 return ret;
283}
Yi Yang06b2a762008-02-08 04:21:57 -0800284EXPORT_SYMBOL(strict_strtoll);
Yi Yang06b2a762008-02-08 04:21:57 -0800285
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286static int skip_atoi(const char **s)
287{
288 int i=0;
289
290 while (isdigit(**s))
291 i = i*10 + *((*s)++) - '0';
292 return i;
293}
294
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700295/* Decimal conversion is by far the most typical, and is used
296 * for /proc and /sys data. This directly impacts e.g. top performance
297 * with many processes running. We optimize it for speed
298 * using code from
299 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
300 * (with permission from the author, Douglas W. Jones). */
301
302/* Formats correctly any integer in [0,99999].
303 * Outputs from one to five digits depending on input.
304 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
305static char* put_dec_trunc(char *buf, unsigned q)
306{
307 unsigned d3, d2, d1, d0;
308 d1 = (q>>4) & 0xf;
309 d2 = (q>>8) & 0xf;
310 d3 = (q>>12);
311
312 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
313 q = (d0 * 0xcd) >> 11;
314 d0 = d0 - 10*q;
315 *buf++ = d0 + '0'; /* least significant digit */
316 d1 = q + 9*d3 + 5*d2 + d1;
317 if (d1 != 0) {
318 q = (d1 * 0xcd) >> 11;
319 d1 = d1 - 10*q;
320 *buf++ = d1 + '0'; /* next digit */
321
322 d2 = q + 2*d2;
323 if ((d2 != 0) || (d3 != 0)) {
324 q = (d2 * 0xd) >> 7;
325 d2 = d2 - 10*q;
326 *buf++ = d2 + '0'; /* next digit */
327
328 d3 = q + 4*d3;
329 if (d3 != 0) {
330 q = (d3 * 0xcd) >> 11;
331 d3 = d3 - 10*q;
332 *buf++ = d3 + '0'; /* next digit */
333 if (q != 0)
334 *buf++ = q + '0'; /* most sign. digit */
335 }
336 }
337 }
338 return buf;
339}
340/* Same with if's removed. Always emits five digits */
341static char* put_dec_full(char *buf, unsigned q)
342{
343 /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
344 /* but anyway, gcc produces better code with full-sized ints */
345 unsigned d3, d2, d1, d0;
346 d1 = (q>>4) & 0xf;
347 d2 = (q>>8) & 0xf;
348 d3 = (q>>12);
349
350 /* Possible ways to approx. divide by 10 */
351 /* gcc -O2 replaces multiply with shifts and adds */
352 // (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
353 // (x * 0x67) >> 10: 1100111
354 // (x * 0x34) >> 9: 110100 - same
355 // (x * 0x1a) >> 8: 11010 - same
356 // (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
357
358 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
359 q = (d0 * 0xcd) >> 11;
360 d0 = d0 - 10*q;
361 *buf++ = d0 + '0';
362 d1 = q + 9*d3 + 5*d2 + d1;
363 q = (d1 * 0xcd) >> 11;
364 d1 = d1 - 10*q;
365 *buf++ = d1 + '0';
366
367 d2 = q + 2*d2;
368 q = (d2 * 0xd) >> 7;
369 d2 = d2 - 10*q;
370 *buf++ = d2 + '0';
371
372 d3 = q + 4*d3;
373 q = (d3 * 0xcd) >> 11; /* - shorter code */
374 /* q = (d3 * 0x67) >> 10; - would also work */
375 d3 = d3 - 10*q;
376 *buf++ = d3 + '0';
377 *buf++ = q + '0';
378 return buf;
379}
380/* No inlining helps gcc to use registers better */
381static noinline char* put_dec(char *buf, unsigned long long num)
382{
383 while (1) {
384 unsigned rem;
385 if (num < 100000)
386 return put_dec_trunc(buf, num);
387 rem = do_div(num, 100000);
388 buf = put_dec_full(buf, rem);
389 }
390}
391
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392#define ZEROPAD 1 /* pad with zero */
393#define SIGN 2 /* unsigned/signed long */
394#define PLUS 4 /* show plus */
395#define SPACE 8 /* space if plus */
396#define LEFT 16 /* left justified */
Denys Vlasenko9b706ae2008-02-09 23:24:09 +0100397#define SMALL 32 /* Must be 32 == 0x20 */
398#define SPECIAL 64 /* 0x */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100400enum format_type {
401 FORMAT_TYPE_NONE, /* Just a string part */
Vegard Nossumed681a92009-03-14 12:08:50 +0100402 FORMAT_TYPE_WIDTH,
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100403 FORMAT_TYPE_PRECISION,
404 FORMAT_TYPE_CHAR,
405 FORMAT_TYPE_STR,
406 FORMAT_TYPE_PTR,
407 FORMAT_TYPE_PERCENT_CHAR,
408 FORMAT_TYPE_INVALID,
409 FORMAT_TYPE_LONG_LONG,
410 FORMAT_TYPE_ULONG,
411 FORMAT_TYPE_LONG,
Zhaoleia4e94ef2009-03-27 17:07:05 +0800412 FORMAT_TYPE_UBYTE,
413 FORMAT_TYPE_BYTE,
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100414 FORMAT_TYPE_USHORT,
415 FORMAT_TYPE_SHORT,
416 FORMAT_TYPE_UINT,
417 FORMAT_TYPE_INT,
418 FORMAT_TYPE_NRCHARS,
419 FORMAT_TYPE_SIZE_T,
420 FORMAT_TYPE_PTRDIFF
421};
422
423struct printf_spec {
424 enum format_type type;
425 int flags; /* flags to number() */
426 int field_width; /* width of output field */
427 int base;
428 int precision; /* # of digits/chars */
429 int qualifier;
430};
431
432static char *number(char *buf, char *end, unsigned long long num,
433 struct printf_spec spec)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434{
Denys Vlasenko9b706ae2008-02-09 23:24:09 +0100435 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
436 static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
437
438 char tmp[66];
439 char sign;
440 char locase;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100441 int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 int i;
443
Denys Vlasenko9b706ae2008-02-09 23:24:09 +0100444 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
445 * produces same digits or (maybe lowercased) letters */
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100446 locase = (spec.flags & SMALL);
447 if (spec.flags & LEFT)
448 spec.flags &= ~ZEROPAD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 sign = 0;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100450 if (spec.flags & SIGN) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 if ((signed long long) num < 0) {
452 sign = '-';
453 num = - (signed long long) num;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100454 spec.field_width--;
455 } else if (spec.flags & PLUS) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 sign = '+';
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100457 spec.field_width--;
458 } else if (spec.flags & SPACE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 sign = ' ';
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100460 spec.field_width--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 }
462 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700463 if (need_pfx) {
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100464 spec.field_width--;
465 if (spec.base == 16)
466 spec.field_width--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700468
469 /* generate full string in tmp[], in reverse order */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 i = 0;
471 if (num == 0)
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700472 tmp[i++] = '0';
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700473 /* Generic code, for any base:
474 else do {
Denys Vlasenko9b706ae2008-02-09 23:24:09 +0100475 tmp[i++] = (digits[do_div(num,base)] | locase);
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700476 } while (num != 0);
477 */
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100478 else if (spec.base != 10) { /* 8 or 16 */
479 int mask = spec.base - 1;
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700480 int shift = 3;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100481 if (spec.base == 16) shift = 4;
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700482 do {
Denys Vlasenko9b706ae2008-02-09 23:24:09 +0100483 tmp[i++] = (digits[((unsigned char)num) & mask] | locase);
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700484 num >>= shift;
485 } while (num);
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700486 } else { /* base 10 */
487 i = put_dec(tmp, num) - tmp;
488 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700489
490 /* printing 100 using %2d gives "100", not "00" */
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100491 if (i > spec.precision)
492 spec.precision = i;
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700493 /* leading space padding */
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100494 spec.field_width -= spec.precision;
495 if (!(spec.flags & (ZEROPAD+LEFT))) {
496 while(--spec.field_width >= 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700497 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 *buf = ' ';
499 ++buf;
500 }
501 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700502 /* sign */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 if (sign) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700504 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 *buf = sign;
506 ++buf;
507 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700508 /* "0x" / "0" prefix */
509 if (need_pfx) {
510 if (buf < end)
511 *buf = '0';
512 ++buf;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100513 if (spec.base == 16) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700514 if (buf < end)
Denys Vlasenko9b706ae2008-02-09 23:24:09 +0100515 *buf = ('X' | locase);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 ++buf;
517 }
518 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700519 /* zero or space padding */
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100520 if (!(spec.flags & LEFT)) {
521 char c = (spec.flags & ZEROPAD) ? '0' : ' ';
522 while (--spec.field_width >= 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700523 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 *buf = c;
525 ++buf;
526 }
527 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700528 /* hmm even more zero padding? */
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100529 while (i <= --spec.precision) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700530 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 *buf = '0';
532 ++buf;
533 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700534 /* actual digits of result */
535 while (--i >= 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700536 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 *buf = tmp[i];
538 ++buf;
539 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700540 /* trailing space padding */
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100541 while (--spec.field_width >= 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700542 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 *buf = ' ';
544 ++buf;
545 }
546 return buf;
547}
548
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100549static char *string(char *buf, char *end, char *s, struct printf_spec spec)
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700550{
551 int len, i;
552
553 if ((unsigned long)s < PAGE_SIZE)
554 s = "<NULL>";
555
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100556 len = strnlen(s, spec.precision);
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700557
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100558 if (!(spec.flags & LEFT)) {
559 while (len < spec.field_width--) {
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700560 if (buf < end)
561 *buf = ' ';
562 ++buf;
563 }
564 }
565 for (i = 0; i < len; ++i) {
566 if (buf < end)
567 *buf = *s;
568 ++buf; ++s;
569 }
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100570 while (len < spec.field_width--) {
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700571 if (buf < end)
572 *buf = ' ';
573 ++buf;
574 }
575 return buf;
576}
577
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100578static char *symbol_string(char *buf, char *end, void *ptr,
Frederic Weisbecker0c8b9462009-04-15 17:48:18 +0200579 struct printf_spec spec, char ext)
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700580{
581 unsigned long value = (unsigned long) ptr;
582#ifdef CONFIG_KALLSYMS
583 char sym[KSYM_SYMBOL_LEN];
Frederic Weisbecker0c8b9462009-04-15 17:48:18 +0200584 if (ext != 'f')
585 sprint_symbol(sym, value);
586 else
587 kallsyms_lookup(value, NULL, NULL, NULL, sym);
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100588 return string(buf, end, sym, spec);
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700589#else
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100590 spec.field_width = 2*sizeof(void *);
591 spec.flags |= SPECIAL | SMALL | ZEROPAD;
592 spec.base = 16;
593 return number(buf, end, value, spec);
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700594#endif
595}
596
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100597static char *resource_string(char *buf, char *end, struct resource *res,
598 struct printf_spec spec)
Linus Torvalds332d2e72008-10-20 15:07:34 +1100599{
600#ifndef IO_RSRC_PRINTK_SIZE
601#define IO_RSRC_PRINTK_SIZE 4
602#endif
603
604#ifndef MEM_RSRC_PRINTK_SIZE
605#define MEM_RSRC_PRINTK_SIZE 8
606#endif
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100607 struct printf_spec num_spec = {
608 .base = 16,
609 .precision = -1,
610 .flags = SPECIAL | SMALL | ZEROPAD,
611 };
Linus Torvalds332d2e72008-10-20 15:07:34 +1100612 /* room for the actual numbers, the two "0x", -, [, ] and the final zero */
613 char sym[4*sizeof(resource_size_t) + 8];
614 char *p = sym, *pend = sym + sizeof(sym);
615 int size = -1;
616
617 if (res->flags & IORESOURCE_IO)
618 size = IO_RSRC_PRINTK_SIZE;
619 else if (res->flags & IORESOURCE_MEM)
620 size = MEM_RSRC_PRINTK_SIZE;
621
622 *p++ = '[';
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100623 num_spec.field_width = size;
624 p = number(p, pend, res->start, num_spec);
Linus Torvalds332d2e72008-10-20 15:07:34 +1100625 *p++ = '-';
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100626 p = number(p, pend, res->end, num_spec);
Linus Torvalds332d2e72008-10-20 15:07:34 +1100627 *p++ = ']';
628 *p = 0;
629
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100630 return string(buf, end, sym, spec);
Linus Torvalds332d2e72008-10-20 15:07:34 +1100631}
632
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100633static char *mac_address_string(char *buf, char *end, u8 *addr,
Joe Perches8a27f7c2009-08-17 12:29:44 +0000634 struct printf_spec spec, const char *fmt)
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700635{
Joe Perches8a27f7c2009-08-17 12:29:44 +0000636 char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700637 char *p = mac_addr;
638 int i;
639
640 for (i = 0; i < 6; i++) {
641 p = pack_hex_byte(p, addr[i]);
Joe Perches8a27f7c2009-08-17 12:29:44 +0000642 if (fmt[0] == 'M' && i != 5)
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700643 *p++ = ':';
644 }
645 *p = '\0';
646
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100647 return string(buf, end, mac_addr, spec);
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700648}
649
Joe Perches8a27f7c2009-08-17 12:29:44 +0000650static char *ip4_string(char *p, const u8 *addr, bool leading_zeros)
Harvey Harrison689afa72008-10-28 16:04:44 -0700651{
Harvey Harrison689afa72008-10-28 16:04:44 -0700652 int i;
653
Joe Perches8a27f7c2009-08-17 12:29:44 +0000654 for (i = 0; i < 4; i++) {
655 char temp[3]; /* hold each IP quad in reverse order */
656 int digits = put_dec_trunc(temp, addr[i]) - temp;
657 if (leading_zeros) {
658 if (digits < 3)
659 *p++ = '0';
660 if (digits < 2)
661 *p++ = '0';
662 }
663 /* reverse the digits in the quad */
664 while (digits--)
665 *p++ = temp[digits];
666 if (i < 3)
667 *p++ = '.';
668 }
669
670 *p = '\0';
671 return p;
672}
673
674static char *ip6_compressed_string(char *p, const struct in6_addr *addr)
675{
676 int i;
677 int j;
678 int range;
679 unsigned char zerolength[8];
680 int longest = 1;
681 int colonpos = -1;
682 u16 word;
683 u8 hi;
684 u8 lo;
685 bool needcolon = false;
686 bool useIPv4 = ipv6_addr_v4mapped(addr) || ipv6_addr_is_isatap(addr);
687
688 memset(zerolength, 0, sizeof(zerolength));
689
690 if (useIPv4)
691 range = 6;
692 else
693 range = 8;
694
695 /* find position of longest 0 run */
696 for (i = 0; i < range; i++) {
697 for (j = i; j < range; j++) {
698 if (addr->s6_addr16[j] != 0)
699 break;
700 zerolength[i]++;
701 }
702 }
703 for (i = 0; i < range; i++) {
704 if (zerolength[i] > longest) {
705 longest = zerolength[i];
706 colonpos = i;
707 }
708 }
709
710 /* emit address */
711 for (i = 0; i < range; i++) {
712 if (i == colonpos) {
713 if (needcolon || i == 0)
714 *p++ = ':';
715 *p++ = ':';
716 needcolon = false;
717 i += longest - 1;
718 continue;
719 }
720 if (needcolon) {
721 *p++ = ':';
722 needcolon = false;
723 }
724 /* hex u16 without leading 0s */
725 word = ntohs(addr->s6_addr16[i]);
726 hi = word >> 8;
727 lo = word & 0xff;
728 if (hi) {
729 if (hi > 0x0f)
730 p = pack_hex_byte(p, hi);
731 else
732 *p++ = hex_asc_lo(hi);
733 }
734 if (hi || lo > 0x0f)
735 p = pack_hex_byte(p, lo);
736 else
737 *p++ = hex_asc_lo(lo);
738 needcolon = true;
739 }
740
741 if (useIPv4) {
742 if (needcolon)
743 *p++ = ':';
744 p = ip4_string(p, &addr->s6_addr[12], false);
745 }
746
747 *p = '\0';
748 return p;
749}
750
751static char *ip6_string(char *p, const struct in6_addr *addr, const char *fmt)
752{
753 int i;
Harvey Harrison689afa72008-10-28 16:04:44 -0700754 for (i = 0; i < 8; i++) {
Joe Perches8a27f7c2009-08-17 12:29:44 +0000755 p = pack_hex_byte(p, addr->s6_addr[2 * i]);
756 p = pack_hex_byte(p, addr->s6_addr[2 * i + 1]);
757 if (fmt[0] == 'I' && i != 7)
Harvey Harrison689afa72008-10-28 16:04:44 -0700758 *p++ = ':';
759 }
Joe Perches8a27f7c2009-08-17 12:29:44 +0000760
Harvey Harrison689afa72008-10-28 16:04:44 -0700761 *p = '\0';
Joe Perches8a27f7c2009-08-17 12:29:44 +0000762 return p;
763}
764
765static char *ip6_addr_string(char *buf, char *end, const u8 *addr,
766 struct printf_spec spec, const char *fmt)
767{
768 char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
769
770 if (fmt[0] == 'I' && fmt[2] == 'c')
771 ip6_compressed_string(ip6_addr, (const struct in6_addr *)addr);
772 else
773 ip6_string(ip6_addr, (const struct in6_addr *)addr, fmt);
Harvey Harrison689afa72008-10-28 16:04:44 -0700774
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100775 return string(buf, end, ip6_addr, spec);
Harvey Harrison689afa72008-10-28 16:04:44 -0700776}
777
Joe Perches8a27f7c2009-08-17 12:29:44 +0000778static char *ip4_addr_string(char *buf, char *end, const u8 *addr,
779 struct printf_spec spec, const char *fmt)
Harvey Harrison4aa99602008-10-29 12:49:58 -0700780{
Joe Perches8a27f7c2009-08-17 12:29:44 +0000781 char ip4_addr[sizeof("255.255.255.255")];
Harvey Harrison4aa99602008-10-29 12:49:58 -0700782
Joe Perches8a27f7c2009-08-17 12:29:44 +0000783 ip4_string(ip4_addr, addr, fmt[0] == 'i');
Harvey Harrison4aa99602008-10-29 12:49:58 -0700784
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100785 return string(buf, end, ip4_addr, spec);
Harvey Harrison4aa99602008-10-29 12:49:58 -0700786}
787
Linus Torvalds4d8a7432008-07-06 16:24:57 -0700788/*
789 * Show a '%p' thing. A kernel extension is that the '%p' is followed
790 * by an extra set of alphanumeric characters that are extended format
791 * specifiers.
792 *
Linus Torvalds332d2e72008-10-20 15:07:34 +1100793 * Right now we handle:
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700794 *
Frederic Weisbecker0c8b9462009-04-15 17:48:18 +0200795 * - 'F' For symbolic function descriptor pointers with offset
796 * - 'f' For simple symbolic function names without offset
Linus Torvalds332d2e72008-10-20 15:07:34 +1100797 * - 'S' For symbolic direct pointers
798 * - 'R' For a struct resource pointer, it prints the range of
799 * addresses (not the name nor the flags)
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700800 * - 'M' For a 6-byte MAC address, it prints the address in the
801 * usual colon-separated hex notation
Joe Perches8a27f7c2009-08-17 12:29:44 +0000802 * - 'm' For a 6-byte MAC address, it prints the hex address without colons
803 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
804 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
805 * IPv6 uses colon separated network-order 16 bit hex with leading 0's
806 * - 'i' [46] for 'raw' IPv4/IPv6 addresses
807 * IPv6 omits the colons (01020304...0f)
808 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
809 * - 'I6c' for IPv6 addresses printed as specified by
810 * http://www.ietf.org/id/draft-kawamura-ipv6-text-representation-03.txt
Linus Torvalds332d2e72008-10-20 15:07:34 +1100811 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
812 * function pointers are really function descriptors, which contain a
813 * pointer to the real address.
Linus Torvalds4d8a7432008-07-06 16:24:57 -0700814 */
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100815static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
816 struct printf_spec spec)
Linus Torvalds78a8bf62008-07-06 16:16:15 -0700817{
Linus Torvaldsd97106a2009-01-03 11:46:17 -0800818 if (!ptr)
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100819 return string(buf, end, "(null)", spec);
Linus Torvaldsd97106a2009-01-03 11:46:17 -0800820
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700821 switch (*fmt) {
822 case 'F':
Frederic Weisbecker0c8b9462009-04-15 17:48:18 +0200823 case 'f':
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700824 ptr = dereference_function_descriptor(ptr);
825 /* Fallthrough */
826 case 'S':
Frederic Weisbecker0c8b9462009-04-15 17:48:18 +0200827 return symbol_string(buf, end, ptr, spec, *fmt);
Linus Torvalds332d2e72008-10-20 15:07:34 +1100828 case 'R':
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100829 return resource_string(buf, end, ptr, spec);
Joe Perches8a27f7c2009-08-17 12:29:44 +0000830 case 'M': /* Colon separated: 00:01:02:03:04:05 */
831 case 'm': /* Contiguous: 000102030405 */
832 return mac_address_string(buf, end, ptr, spec, fmt);
833 case 'I': /* Formatted IP supported
834 * 4: 1.2.3.4
835 * 6: 0001:0203:...:0708
836 * 6c: 1::708 or 1::1.2.3.4
837 */
838 case 'i': /* Contiguous:
839 * 4: 001.002.003.004
840 * 6: 000102...0f
841 */
842 switch (fmt[1]) {
843 case '6':
844 return ip6_addr_string(buf, end, ptr, spec, fmt);
845 case '4':
846 return ip4_addr_string(buf, end, ptr, spec, fmt);
847 }
Harvey Harrison4aa99602008-10-29 12:49:58 -0700848 break;
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700849 }
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100850 spec.flags |= SMALL;
851 if (spec.field_width == -1) {
852 spec.field_width = 2*sizeof(void *);
853 spec.flags |= ZEROPAD;
Linus Torvalds78a8bf62008-07-06 16:16:15 -0700854 }
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100855 spec.base = 16;
856
857 return number(buf, end, (unsigned long) ptr, spec);
858}
859
860/*
861 * Helper function to decode printf style format.
862 * Each call decode a token from the format and return the
863 * number of characters read (or likely the delta where it wants
864 * to go on the next call).
865 * The decoded token is returned through the parameters
866 *
867 * 'h', 'l', or 'L' for integer fields
868 * 'z' support added 23/7/1999 S.H.
869 * 'z' changed to 'Z' --davidm 1/25/99
870 * 't' added for ptrdiff_t
871 *
872 * @fmt: the format string
873 * @type of the token returned
874 * @flags: various flags such as +, -, # tokens..
875 * @field_width: overwritten width
876 * @base: base of the number (octal, hex, ...)
877 * @precision: precision of a number
878 * @qualifier: qualifier of a number (long, size_t, ...)
879 */
880static int format_decode(const char *fmt, struct printf_spec *spec)
881{
882 const char *start = fmt;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100883
884 /* we finished early by reading the field width */
Vegard Nossumed681a92009-03-14 12:08:50 +0100885 if (spec->type == FORMAT_TYPE_WIDTH) {
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100886 if (spec->field_width < 0) {
887 spec->field_width = -spec->field_width;
888 spec->flags |= LEFT;
889 }
890 spec->type = FORMAT_TYPE_NONE;
891 goto precision;
892 }
893
894 /* we finished early by reading the precision */
895 if (spec->type == FORMAT_TYPE_PRECISION) {
896 if (spec->precision < 0)
897 spec->precision = 0;
898
899 spec->type = FORMAT_TYPE_NONE;
900 goto qualifier;
901 }
902
903 /* By default */
904 spec->type = FORMAT_TYPE_NONE;
905
906 for (; *fmt ; ++fmt) {
907 if (*fmt == '%')
908 break;
909 }
910
911 /* Return the current non-format string */
912 if (fmt != start || !*fmt)
913 return fmt - start;
914
915 /* Process flags */
916 spec->flags = 0;
917
918 while (1) { /* this also skips first '%' */
919 bool found = true;
920
921 ++fmt;
922
923 switch (*fmt) {
924 case '-': spec->flags |= LEFT; break;
925 case '+': spec->flags |= PLUS; break;
926 case ' ': spec->flags |= SPACE; break;
927 case '#': spec->flags |= SPECIAL; break;
928 case '0': spec->flags |= ZEROPAD; break;
929 default: found = false;
930 }
931
932 if (!found)
933 break;
934 }
935
936 /* get field width */
937 spec->field_width = -1;
938
939 if (isdigit(*fmt))
940 spec->field_width = skip_atoi(&fmt);
941 else if (*fmt == '*') {
942 /* it's the next argument */
Vegard Nossumed681a92009-03-14 12:08:50 +0100943 spec->type = FORMAT_TYPE_WIDTH;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100944 return ++fmt - start;
945 }
946
947precision:
948 /* get the precision */
949 spec->precision = -1;
950 if (*fmt == '.') {
951 ++fmt;
952 if (isdigit(*fmt)) {
953 spec->precision = skip_atoi(&fmt);
954 if (spec->precision < 0)
955 spec->precision = 0;
956 } else if (*fmt == '*') {
957 /* it's the next argument */
Vegard Nossumadf26f82009-03-14 12:08:50 +0100958 spec->type = FORMAT_TYPE_PRECISION;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100959 return ++fmt - start;
960 }
961 }
962
963qualifier:
964 /* get the conversion qualifier */
965 spec->qualifier = -1;
966 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
967 *fmt == 'Z' || *fmt == 'z' || *fmt == 't') {
Zhaoleia4e94ef2009-03-27 17:07:05 +0800968 spec->qualifier = *fmt++;
969 if (unlikely(spec->qualifier == *fmt)) {
970 if (spec->qualifier == 'l') {
971 spec->qualifier = 'L';
972 ++fmt;
973 } else if (spec->qualifier == 'h') {
974 spec->qualifier = 'H';
975 ++fmt;
976 }
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100977 }
978 }
979
980 /* default base */
981 spec->base = 10;
982 switch (*fmt) {
983 case 'c':
984 spec->type = FORMAT_TYPE_CHAR;
985 return ++fmt - start;
986
987 case 's':
988 spec->type = FORMAT_TYPE_STR;
989 return ++fmt - start;
990
991 case 'p':
992 spec->type = FORMAT_TYPE_PTR;
993 return fmt - start;
994 /* skip alnum */
995
996 case 'n':
997 spec->type = FORMAT_TYPE_NRCHARS;
998 return ++fmt - start;
999
1000 case '%':
1001 spec->type = FORMAT_TYPE_PERCENT_CHAR;
1002 return ++fmt - start;
1003
1004 /* integer number formats - set up the flags and "break" */
1005 case 'o':
1006 spec->base = 8;
1007 break;
1008
1009 case 'x':
1010 spec->flags |= SMALL;
1011
1012 case 'X':
1013 spec->base = 16;
1014 break;
1015
1016 case 'd':
1017 case 'i':
Frederic Weisbecker39e874f2009-03-09 21:15:04 +01001018 spec->flags |= SIGN;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001019 case 'u':
1020 break;
1021
1022 default:
1023 spec->type = FORMAT_TYPE_INVALID;
1024 return fmt - start;
1025 }
1026
1027 if (spec->qualifier == 'L')
1028 spec->type = FORMAT_TYPE_LONG_LONG;
1029 else if (spec->qualifier == 'l') {
Frederic Weisbecker39e874f2009-03-09 21:15:04 +01001030 if (spec->flags & SIGN)
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001031 spec->type = FORMAT_TYPE_LONG;
1032 else
1033 spec->type = FORMAT_TYPE_ULONG;
1034 } else if (spec->qualifier == 'Z' || spec->qualifier == 'z') {
1035 spec->type = FORMAT_TYPE_SIZE_T;
1036 } else if (spec->qualifier == 't') {
1037 spec->type = FORMAT_TYPE_PTRDIFF;
Zhaoleia4e94ef2009-03-27 17:07:05 +08001038 } else if (spec->qualifier == 'H') {
1039 if (spec->flags & SIGN)
1040 spec->type = FORMAT_TYPE_BYTE;
1041 else
1042 spec->type = FORMAT_TYPE_UBYTE;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001043 } else if (spec->qualifier == 'h') {
Frederic Weisbecker39e874f2009-03-09 21:15:04 +01001044 if (spec->flags & SIGN)
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001045 spec->type = FORMAT_TYPE_SHORT;
1046 else
1047 spec->type = FORMAT_TYPE_USHORT;
1048 } else {
Frederic Weisbecker39e874f2009-03-09 21:15:04 +01001049 if (spec->flags & SIGN)
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001050 spec->type = FORMAT_TYPE_INT;
1051 else
1052 spec->type = FORMAT_TYPE_UINT;
1053 }
1054
1055 return ++fmt - start;
Linus Torvalds78a8bf62008-07-06 16:16:15 -07001056}
1057
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058/**
1059 * vsnprintf - Format a string and place it in a buffer
1060 * @buf: The buffer to place the result into
1061 * @size: The size of the buffer, including the trailing null space
1062 * @fmt: The format string to use
1063 * @args: Arguments for the format string
1064 *
Andi Kleen20036fd2008-10-15 22:02:02 -07001065 * This function follows C99 vsnprintf, but has some extensions:
1066 * %pS output the name of a text symbol
Frederic Weisbecker0c8b9462009-04-15 17:48:18 +02001067 * %pF output the name of a function pointer with its offset
1068 * %pf output the name of a function pointer without its offset
Linus Torvalds332d2e72008-10-20 15:07:34 +11001069 * %pR output the address range in a struct resource
Andi Kleen20036fd2008-10-15 22:02:02 -07001070 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071 * The return value is the number of characters which would
1072 * be generated for the given input, excluding the trailing
1073 * '\0', as per ISO C99. If you want to have the exact
1074 * number of characters written into @buf as return value
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001075 * (not including the trailing '\0'), use vscnprintf(). If the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076 * return is greater than or equal to @size, the resulting
1077 * string is truncated.
1078 *
1079 * Call this function if you are already dealing with a va_list.
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001080 * You probably want snprintf() instead.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 */
1082int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
1083{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084 unsigned long long num;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 char *str, *end, c;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001086 int read;
1087 struct printf_spec spec = {0};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001089 /* Reject out-of-range values early. Large positive sizes are
1090 used for unknown buffer sizes. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091 if (unlikely((int) size < 0)) {
1092 /* There can be only one.. */
Denis Vlasenkob39a7342007-07-15 23:41:54 -07001093 static char warn = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094 WARN_ON(warn);
1095 warn = 0;
1096 return 0;
1097 }
1098
1099 str = buf;
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001100 end = buf + size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001102 /* Make sure end is always >= buf */
1103 if (end < buf) {
1104 end = ((void *)-1);
1105 size = end - buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 }
1107
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001108 while (*fmt) {
1109 const char *old_fmt = fmt;
1110
1111 read = format_decode(fmt, &spec);
1112
1113 fmt += read;
1114
1115 switch (spec.type) {
1116 case FORMAT_TYPE_NONE: {
1117 int copy = read;
1118 if (str < end) {
1119 if (copy > end - str)
1120 copy = end - str;
1121 memcpy(str, old_fmt, copy);
1122 }
1123 str += read;
1124 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125 }
1126
Vegard Nossumed681a92009-03-14 12:08:50 +01001127 case FORMAT_TYPE_WIDTH:
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001128 spec.field_width = va_arg(args, int);
1129 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001131 case FORMAT_TYPE_PRECISION:
1132 spec.precision = va_arg(args, int);
1133 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001135 case FORMAT_TYPE_CHAR:
1136 if (!(spec.flags & LEFT)) {
1137 while (--spec.field_width > 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001138 if (str < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139 *str = ' ';
1140 ++str;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001141
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142 }
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001143 }
1144 c = (unsigned char) va_arg(args, int);
1145 if (str < end)
1146 *str = c;
1147 ++str;
1148 while (--spec.field_width > 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001149 if (str < end)
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001150 *str = ' ';
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151 ++str;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001152 }
1153 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001155 case FORMAT_TYPE_STR:
1156 str = string(str, end, va_arg(args, char *), spec);
1157 break;
1158
1159 case FORMAT_TYPE_PTR:
1160 str = pointer(fmt+1, str, end, va_arg(args, void *),
1161 spec);
1162 while (isalnum(*fmt))
1163 fmt++;
1164 break;
1165
1166 case FORMAT_TYPE_PERCENT_CHAR:
1167 if (str < end)
1168 *str = '%';
1169 ++str;
1170 break;
1171
1172 case FORMAT_TYPE_INVALID:
1173 if (str < end)
1174 *str = '%';
1175 ++str;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001176 break;
1177
1178 case FORMAT_TYPE_NRCHARS: {
1179 int qualifier = spec.qualifier;
1180
1181 if (qualifier == 'l') {
1182 long *ip = va_arg(args, long *);
1183 *ip = (str - buf);
1184 } else if (qualifier == 'Z' ||
1185 qualifier == 'z') {
1186 size_t *ip = va_arg(args, size_t *);
1187 *ip = (str - buf);
1188 } else {
1189 int *ip = va_arg(args, int *);
1190 *ip = (str - buf);
1191 }
1192 break;
1193 }
1194
1195 default:
1196 switch (spec.type) {
1197 case FORMAT_TYPE_LONG_LONG:
1198 num = va_arg(args, long long);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199 break;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001200 case FORMAT_TYPE_ULONG:
1201 num = va_arg(args, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202 break;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001203 case FORMAT_TYPE_LONG:
1204 num = va_arg(args, long);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 break;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001206 case FORMAT_TYPE_SIZE_T:
1207 num = va_arg(args, size_t);
1208 break;
1209 case FORMAT_TYPE_PTRDIFF:
1210 num = va_arg(args, ptrdiff_t);
1211 break;
Zhaoleia4e94ef2009-03-27 17:07:05 +08001212 case FORMAT_TYPE_UBYTE:
1213 num = (unsigned char) va_arg(args, int);
1214 break;
1215 case FORMAT_TYPE_BYTE:
1216 num = (signed char) va_arg(args, int);
1217 break;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001218 case FORMAT_TYPE_USHORT:
1219 num = (unsigned short) va_arg(args, int);
1220 break;
1221 case FORMAT_TYPE_SHORT:
1222 num = (short) va_arg(args, int);
1223 break;
Frederic Weisbecker39e874f2009-03-09 21:15:04 +01001224 case FORMAT_TYPE_INT:
1225 num = (int) va_arg(args, int);
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001226 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227 default:
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001228 num = va_arg(args, unsigned int);
1229 }
1230
1231 str = number(str, end, num, spec);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233 }
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001234
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001235 if (size > 0) {
1236 if (str < end)
1237 *str = '\0';
1238 else
Linus Torvalds0a6047e2006-06-28 17:09:34 -07001239 end[-1] = '\0';
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001240 }
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001241
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001242 /* the trailing null byte doesn't count towards the total */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243 return str-buf;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001244
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246EXPORT_SYMBOL(vsnprintf);
1247
1248/**
1249 * vscnprintf - Format a string and place it in a buffer
1250 * @buf: The buffer to place the result into
1251 * @size: The size of the buffer, including the trailing null space
1252 * @fmt: The format string to use
1253 * @args: Arguments for the format string
1254 *
1255 * The return value is the number of characters which have been written into
1256 * the @buf not including the trailing '\0'. If @size is <= 0 the function
1257 * returns 0.
1258 *
1259 * Call this function if you are already dealing with a va_list.
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001260 * You probably want scnprintf() instead.
Andi Kleen20036fd2008-10-15 22:02:02 -07001261 *
1262 * See the vsnprintf() documentation for format string extensions over C99.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001263 */
1264int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
1265{
1266 int i;
1267
1268 i=vsnprintf(buf,size,fmt,args);
1269 return (i >= size) ? (size - 1) : i;
1270}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271EXPORT_SYMBOL(vscnprintf);
1272
1273/**
1274 * snprintf - Format a string and place it in a buffer
1275 * @buf: The buffer to place the result into
1276 * @size: The size of the buffer, including the trailing null space
1277 * @fmt: The format string to use
1278 * @...: Arguments for the format string
1279 *
1280 * The return value is the number of characters which would be
1281 * generated for the given input, excluding the trailing null,
1282 * as per ISO C99. If the return is greater than or equal to
1283 * @size, the resulting string is truncated.
Andi Kleen20036fd2008-10-15 22:02:02 -07001284 *
1285 * See the vsnprintf() documentation for format string extensions over C99.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286 */
1287int snprintf(char * buf, size_t size, const char *fmt, ...)
1288{
1289 va_list args;
1290 int i;
1291
1292 va_start(args, fmt);
1293 i=vsnprintf(buf,size,fmt,args);
1294 va_end(args);
1295 return i;
1296}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297EXPORT_SYMBOL(snprintf);
1298
1299/**
1300 * scnprintf - Format a string and place it in a buffer
1301 * @buf: The buffer to place the result into
1302 * @size: The size of the buffer, including the trailing null space
1303 * @fmt: The format string to use
1304 * @...: Arguments for the format string
1305 *
1306 * The return value is the number of characters written into @buf not including
Martin Peschkeea6f3282007-02-12 00:51:56 -08001307 * the trailing '\0'. If @size is <= 0 the function returns 0.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308 */
1309
1310int scnprintf(char * buf, size_t size, const char *fmt, ...)
1311{
1312 va_list args;
1313 int i;
1314
1315 va_start(args, fmt);
1316 i = vsnprintf(buf, size, fmt, args);
1317 va_end(args);
1318 return (i >= size) ? (size - 1) : i;
1319}
1320EXPORT_SYMBOL(scnprintf);
1321
1322/**
1323 * vsprintf - Format a string and place it in a buffer
1324 * @buf: The buffer to place the result into
1325 * @fmt: The format string to use
1326 * @args: Arguments for the format string
1327 *
1328 * The function returns the number of characters written
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001329 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330 * buffer overflows.
1331 *
1332 * Call this function if you are already dealing with a va_list.
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001333 * You probably want sprintf() instead.
Andi Kleen20036fd2008-10-15 22:02:02 -07001334 *
1335 * See the vsnprintf() documentation for format string extensions over C99.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336 */
1337int vsprintf(char *buf, const char *fmt, va_list args)
1338{
1339 return vsnprintf(buf, INT_MAX, fmt, args);
1340}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341EXPORT_SYMBOL(vsprintf);
1342
1343/**
1344 * sprintf - Format a string and place it in a buffer
1345 * @buf: The buffer to place the result into
1346 * @fmt: The format string to use
1347 * @...: Arguments for the format string
1348 *
1349 * The function returns the number of characters written
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001350 * into @buf. Use snprintf() or scnprintf() in order to avoid
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351 * buffer overflows.
Andi Kleen20036fd2008-10-15 22:02:02 -07001352 *
1353 * See the vsnprintf() documentation for format string extensions over C99.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354 */
1355int sprintf(char * buf, const char *fmt, ...)
1356{
1357 va_list args;
1358 int i;
1359
1360 va_start(args, fmt);
1361 i=vsnprintf(buf, INT_MAX, fmt, args);
1362 va_end(args);
1363 return i;
1364}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365EXPORT_SYMBOL(sprintf);
1366
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001367#ifdef CONFIG_BINARY_PRINTF
1368/*
1369 * bprintf service:
1370 * vbin_printf() - VA arguments to binary data
1371 * bstr_printf() - Binary data to text string
1372 */
1373
1374/**
1375 * vbin_printf - Parse a format string and place args' binary value in a buffer
1376 * @bin_buf: The buffer to place args' binary value
1377 * @size: The size of the buffer(by words(32bits), not characters)
1378 * @fmt: The format string to use
1379 * @args: Arguments for the format string
1380 *
1381 * The format follows C99 vsnprintf, except %n is ignored, and its argument
1382 * is skiped.
1383 *
1384 * The return value is the number of words(32bits) which would be generated for
1385 * the given input.
1386 *
1387 * NOTE:
1388 * If the return value is greater than @size, the resulting bin_buf is NOT
1389 * valid for bstr_printf().
1390 */
1391int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
1392{
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001393 struct printf_spec spec = {0};
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001394 char *str, *end;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001395 int read;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001396
1397 str = (char *)bin_buf;
1398 end = (char *)(bin_buf + size);
1399
1400#define save_arg(type) \
1401do { \
1402 if (sizeof(type) == 8) { \
1403 unsigned long long value; \
1404 str = PTR_ALIGN(str, sizeof(u32)); \
1405 value = va_arg(args, unsigned long long); \
1406 if (str + sizeof(type) <= end) { \
1407 *(u32 *)str = *(u32 *)&value; \
1408 *(u32 *)(str + 4) = *((u32 *)&value + 1); \
1409 } \
1410 } else { \
1411 unsigned long value; \
1412 str = PTR_ALIGN(str, sizeof(type)); \
1413 value = va_arg(args, int); \
1414 if (str + sizeof(type) <= end) \
1415 *(typeof(type) *)str = (type)value; \
1416 } \
1417 str += sizeof(type); \
1418} while (0)
1419
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001420
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001421 while (*fmt) {
1422 read = format_decode(fmt, &spec);
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001423
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001424 fmt += read;
1425
1426 switch (spec.type) {
1427 case FORMAT_TYPE_NONE:
1428 break;
1429
Vegard Nossumed681a92009-03-14 12:08:50 +01001430 case FORMAT_TYPE_WIDTH:
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001431 case FORMAT_TYPE_PRECISION:
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001432 save_arg(int);
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001433 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001434
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001435 case FORMAT_TYPE_CHAR:
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001436 save_arg(char);
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001437 break;
1438
1439 case FORMAT_TYPE_STR: {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001440 const char *save_str = va_arg(args, char *);
1441 size_t len;
1442 if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
1443 || (unsigned long)save_str < PAGE_SIZE)
1444 save_str = "<NULL>";
1445 len = strlen(save_str);
1446 if (str + len + 1 < end)
1447 memcpy(str, save_str, len + 1);
1448 str += len + 1;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001449 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001450 }
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001451
1452 case FORMAT_TYPE_PTR:
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001453 save_arg(void *);
1454 /* skip all alphanumeric pointer suffixes */
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001455 while (isalnum(*fmt))
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001456 fmt++;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001457 break;
1458
1459 case FORMAT_TYPE_PERCENT_CHAR:
1460 break;
1461
1462 case FORMAT_TYPE_INVALID:
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001463 break;
1464
1465 case FORMAT_TYPE_NRCHARS: {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001466 /* skip %n 's argument */
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001467 int qualifier = spec.qualifier;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001468 void *skip_arg;
1469 if (qualifier == 'l')
1470 skip_arg = va_arg(args, long *);
1471 else if (qualifier == 'Z' || qualifier == 'z')
1472 skip_arg = va_arg(args, size_t *);
1473 else
1474 skip_arg = va_arg(args, int *);
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001475 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001476 }
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001477
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001478 default:
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001479 switch (spec.type) {
1480
1481 case FORMAT_TYPE_LONG_LONG:
1482 save_arg(long long);
1483 break;
1484 case FORMAT_TYPE_ULONG:
1485 case FORMAT_TYPE_LONG:
1486 save_arg(unsigned long);
1487 break;
1488 case FORMAT_TYPE_SIZE_T:
1489 save_arg(size_t);
1490 break;
1491 case FORMAT_TYPE_PTRDIFF:
1492 save_arg(ptrdiff_t);
1493 break;
Zhaoleia4e94ef2009-03-27 17:07:05 +08001494 case FORMAT_TYPE_UBYTE:
1495 case FORMAT_TYPE_BYTE:
1496 save_arg(char);
1497 break;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001498 case FORMAT_TYPE_USHORT:
1499 case FORMAT_TYPE_SHORT:
1500 save_arg(short);
1501 break;
1502 default:
1503 save_arg(int);
1504 }
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001505 }
1506 }
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001507 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001508
1509#undef save_arg
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001510}
1511EXPORT_SYMBOL_GPL(vbin_printf);
1512
1513/**
1514 * bstr_printf - Format a string from binary arguments and place it in a buffer
1515 * @buf: The buffer to place the result into
1516 * @size: The size of the buffer, including the trailing null space
1517 * @fmt: The format string to use
1518 * @bin_buf: Binary arguments for the format string
1519 *
1520 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
1521 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
1522 * a binary buffer that generated by vbin_printf.
1523 *
1524 * The format follows C99 vsnprintf, but has some extensions:
1525 * %pS output the name of a text symbol
Frederic Weisbecker0c8b9462009-04-15 17:48:18 +02001526 * %pF output the name of a function pointer with its offset
1527 * %pf output the name of a function pointer without its offset
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001528 * %pR output the address range in a struct resource
1529 * %n is ignored
1530 *
1531 * The return value is the number of characters which would
1532 * be generated for the given input, excluding the trailing
1533 * '\0', as per ISO C99. If you want to have the exact
1534 * number of characters written into @buf as return value
1535 * (not including the trailing '\0'), use vscnprintf(). If the
1536 * return is greater than or equal to @size, the resulting
1537 * string is truncated.
1538 */
1539int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
1540{
1541 unsigned long long num;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001542 char *str, *end, c;
1543 const char *args = (const char *)bin_buf;
1544
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001545 struct printf_spec spec = {0};
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001546
1547 if (unlikely((int) size < 0)) {
1548 /* There can be only one.. */
1549 static char warn = 1;
1550 WARN_ON(warn);
1551 warn = 0;
1552 return 0;
1553 }
1554
1555 str = buf;
1556 end = buf + size;
1557
1558#define get_arg(type) \
1559({ \
1560 typeof(type) value; \
1561 if (sizeof(type) == 8) { \
1562 args = PTR_ALIGN(args, sizeof(u32)); \
1563 *(u32 *)&value = *(u32 *)args; \
1564 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
1565 } else { \
1566 args = PTR_ALIGN(args, sizeof(type)); \
1567 value = *(typeof(type) *)args; \
1568 } \
1569 args += sizeof(type); \
1570 value; \
1571})
1572
1573 /* Make sure end is always >= buf */
1574 if (end < buf) {
1575 end = ((void *)-1);
1576 size = end - buf;
1577 }
1578
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001579 while (*fmt) {
1580 int read;
1581 const char *old_fmt = fmt;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001582
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001583 read = format_decode(fmt, &spec);
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001584
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001585 fmt += read;
1586
1587 switch (spec.type) {
1588 case FORMAT_TYPE_NONE: {
1589 int copy = read;
1590 if (str < end) {
1591 if (copy > end - str)
1592 copy = end - str;
1593 memcpy(str, old_fmt, copy);
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001594 }
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001595 str += read;
1596 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001597 }
1598
Vegard Nossumed681a92009-03-14 12:08:50 +01001599 case FORMAT_TYPE_WIDTH:
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001600 spec.field_width = get_arg(int);
1601 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001602
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001603 case FORMAT_TYPE_PRECISION:
1604 spec.precision = get_arg(int);
1605 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001606
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001607 case FORMAT_TYPE_CHAR:
1608 if (!(spec.flags & LEFT)) {
1609 while (--spec.field_width > 0) {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001610 if (str < end)
1611 *str = ' ';
1612 ++str;
1613 }
1614 }
1615 c = (unsigned char) get_arg(char);
1616 if (str < end)
1617 *str = c;
1618 ++str;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001619 while (--spec.field_width > 0) {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001620 if (str < end)
1621 *str = ' ';
1622 ++str;
1623 }
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001624 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001625
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001626 case FORMAT_TYPE_STR: {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001627 const char *str_arg = args;
1628 size_t len = strlen(str_arg);
1629 args += len + 1;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001630 str = string(str, end, (char *)str_arg, spec);
1631 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001632 }
1633
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001634 case FORMAT_TYPE_PTR:
1635 str = pointer(fmt+1, str, end, get_arg(void *), spec);
1636 while (isalnum(*fmt))
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001637 fmt++;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001638 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001639
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001640 case FORMAT_TYPE_PERCENT_CHAR:
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001641 if (str < end)
1642 *str = '%';
1643 ++str;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001644 break;
1645
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001646 case FORMAT_TYPE_INVALID:
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001647 if (str < end)
1648 *str = '%';
1649 ++str;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001650 break;
1651
1652 case FORMAT_TYPE_NRCHARS:
1653 /* skip */
1654 break;
1655
1656 default:
1657 switch (spec.type) {
1658
1659 case FORMAT_TYPE_LONG_LONG:
1660 num = get_arg(long long);
1661 break;
1662 case FORMAT_TYPE_ULONG:
1663 num = get_arg(unsigned long);
1664 break;
1665 case FORMAT_TYPE_LONG:
1666 num = get_arg(unsigned long);
1667 break;
1668 case FORMAT_TYPE_SIZE_T:
1669 num = get_arg(size_t);
1670 break;
1671 case FORMAT_TYPE_PTRDIFF:
1672 num = get_arg(ptrdiff_t);
1673 break;
Zhaoleia4e94ef2009-03-27 17:07:05 +08001674 case FORMAT_TYPE_UBYTE:
1675 num = get_arg(unsigned char);
1676 break;
1677 case FORMAT_TYPE_BYTE:
1678 num = get_arg(signed char);
1679 break;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001680 case FORMAT_TYPE_USHORT:
1681 num = get_arg(unsigned short);
1682 break;
1683 case FORMAT_TYPE_SHORT:
1684 num = get_arg(short);
1685 break;
1686 case FORMAT_TYPE_UINT:
1687 num = get_arg(unsigned int);
1688 break;
1689 default:
1690 num = get_arg(int);
1691 }
1692
1693 str = number(str, end, num, spec);
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001694 }
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001695 }
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001696
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001697 if (size > 0) {
1698 if (str < end)
1699 *str = '\0';
1700 else
1701 end[-1] = '\0';
1702 }
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001703
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001704#undef get_arg
1705
1706 /* the trailing null byte doesn't count towards the total */
1707 return str - buf;
1708}
1709EXPORT_SYMBOL_GPL(bstr_printf);
1710
1711/**
1712 * bprintf - Parse a format string and place args' binary value in a buffer
1713 * @bin_buf: The buffer to place args' binary value
1714 * @size: The size of the buffer(by words(32bits), not characters)
1715 * @fmt: The format string to use
1716 * @...: Arguments for the format string
1717 *
1718 * The function returns the number of words(u32) written
1719 * into @bin_buf.
1720 */
1721int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
1722{
1723 va_list args;
1724 int ret;
1725
1726 va_start(args, fmt);
1727 ret = vbin_printf(bin_buf, size, fmt, args);
1728 va_end(args);
1729 return ret;
1730}
1731EXPORT_SYMBOL_GPL(bprintf);
1732
1733#endif /* CONFIG_BINARY_PRINTF */
1734
Linus Torvalds1da177e2005-04-16 15:20:36 -07001735/**
1736 * vsscanf - Unformat a buffer into a list of arguments
1737 * @buf: input buffer
1738 * @fmt: format of buffer
1739 * @args: arguments
1740 */
1741int vsscanf(const char * buf, const char * fmt, va_list args)
1742{
1743 const char *str = buf;
1744 char *next;
1745 char digit;
1746 int num = 0;
1747 int qualifier;
1748 int base;
1749 int field_width;
1750 int is_sign = 0;
1751
1752 while(*fmt && *str) {
1753 /* skip any white space in format */
1754 /* white space in format matchs any amount of
1755 * white space, including none, in the input.
1756 */
1757 if (isspace(*fmt)) {
1758 while (isspace(*fmt))
1759 ++fmt;
1760 while (isspace(*str))
1761 ++str;
1762 }
1763
1764 /* anything that is not a conversion must match exactly */
1765 if (*fmt != '%' && *fmt) {
1766 if (*fmt++ != *str++)
1767 break;
1768 continue;
1769 }
1770
1771 if (!*fmt)
1772 break;
1773 ++fmt;
1774
1775 /* skip this conversion.
1776 * advance both strings to next white space
1777 */
1778 if (*fmt == '*') {
1779 while (!isspace(*fmt) && *fmt)
1780 fmt++;
1781 while (!isspace(*str) && *str)
1782 str++;
1783 continue;
1784 }
1785
1786 /* get field width */
1787 field_width = -1;
1788 if (isdigit(*fmt))
1789 field_width = skip_atoi(&fmt);
1790
1791 /* get conversion qualifier */
1792 qualifier = -1;
1793 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
1794 *fmt == 'Z' || *fmt == 'z') {
1795 qualifier = *fmt++;
1796 if (unlikely(qualifier == *fmt)) {
1797 if (qualifier == 'h') {
1798 qualifier = 'H';
1799 fmt++;
1800 } else if (qualifier == 'l') {
1801 qualifier = 'L';
1802 fmt++;
1803 }
1804 }
1805 }
1806 base = 10;
1807 is_sign = 0;
1808
1809 if (!*fmt || !*str)
1810 break;
1811
1812 switch(*fmt++) {
1813 case 'c':
1814 {
1815 char *s = (char *) va_arg(args,char*);
1816 if (field_width == -1)
1817 field_width = 1;
1818 do {
1819 *s++ = *str++;
1820 } while (--field_width > 0 && *str);
1821 num++;
1822 }
1823 continue;
1824 case 's':
1825 {
1826 char *s = (char *) va_arg(args, char *);
1827 if(field_width == -1)
1828 field_width = INT_MAX;
1829 /* first, skip leading white space in buffer */
1830 while (isspace(*str))
1831 str++;
1832
1833 /* now copy until next white space */
1834 while (*str && !isspace(*str) && field_width--) {
1835 *s++ = *str++;
1836 }
1837 *s = '\0';
1838 num++;
1839 }
1840 continue;
1841 case 'n':
1842 /* return number of characters read so far */
1843 {
1844 int *i = (int *)va_arg(args,int*);
1845 *i = str - buf;
1846 }
1847 continue;
1848 case 'o':
1849 base = 8;
1850 break;
1851 case 'x':
1852 case 'X':
1853 base = 16;
1854 break;
1855 case 'i':
1856 base = 0;
1857 case 'd':
1858 is_sign = 1;
1859 case 'u':
1860 break;
1861 case '%':
1862 /* looking for '%' in str */
1863 if (*str++ != '%')
1864 return num;
1865 continue;
1866 default:
1867 /* invalid format; stop here */
1868 return num;
1869 }
1870
1871 /* have some sort of integer conversion.
1872 * first, skip white space in buffer.
1873 */
1874 while (isspace(*str))
1875 str++;
1876
1877 digit = *str;
1878 if (is_sign && digit == '-')
1879 digit = *(str + 1);
1880
1881 if (!digit
1882 || (base == 16 && !isxdigit(digit))
1883 || (base == 10 && !isdigit(digit))
1884 || (base == 8 && (!isdigit(digit) || digit > '7'))
1885 || (base == 0 && !isdigit(digit)))
1886 break;
1887
1888 switch(qualifier) {
1889 case 'H': /* that's 'hh' in format */
1890 if (is_sign) {
1891 signed char *s = (signed char *) va_arg(args,signed char *);
1892 *s = (signed char) simple_strtol(str,&next,base);
1893 } else {
1894 unsigned char *s = (unsigned char *) va_arg(args, unsigned char *);
1895 *s = (unsigned char) simple_strtoul(str, &next, base);
1896 }
1897 break;
1898 case 'h':
1899 if (is_sign) {
1900 short *s = (short *) va_arg(args,short *);
1901 *s = (short) simple_strtol(str,&next,base);
1902 } else {
1903 unsigned short *s = (unsigned short *) va_arg(args, unsigned short *);
1904 *s = (unsigned short) simple_strtoul(str, &next, base);
1905 }
1906 break;
1907 case 'l':
1908 if (is_sign) {
1909 long *l = (long *) va_arg(args,long *);
1910 *l = simple_strtol(str,&next,base);
1911 } else {
1912 unsigned long *l = (unsigned long*) va_arg(args,unsigned long*);
1913 *l = simple_strtoul(str,&next,base);
1914 }
1915 break;
1916 case 'L':
1917 if (is_sign) {
1918 long long *l = (long long*) va_arg(args,long long *);
1919 *l = simple_strtoll(str,&next,base);
1920 } else {
1921 unsigned long long *l = (unsigned long long*) va_arg(args,unsigned long long*);
1922 *l = simple_strtoull(str,&next,base);
1923 }
1924 break;
1925 case 'Z':
1926 case 'z':
1927 {
1928 size_t *s = (size_t*) va_arg(args,size_t*);
1929 *s = (size_t) simple_strtoul(str,&next,base);
1930 }
1931 break;
1932 default:
1933 if (is_sign) {
1934 int *i = (int *) va_arg(args, int*);
1935 *i = (int) simple_strtol(str,&next,base);
1936 } else {
1937 unsigned int *i = (unsigned int*) va_arg(args, unsigned int*);
1938 *i = (unsigned int) simple_strtoul(str,&next,base);
1939 }
1940 break;
1941 }
1942 num++;
1943
1944 if (!next)
1945 break;
1946 str = next;
1947 }
Johannes Bergc6b40d12007-05-08 00:27:20 -07001948
1949 /*
1950 * Now we've come all the way through so either the input string or the
1951 * format ended. In the former case, there can be a %n at the current
1952 * position in the format that needs to be filled.
1953 */
1954 if (*fmt == '%' && *(fmt + 1) == 'n') {
1955 int *p = (int *)va_arg(args, int *);
1956 *p = str - buf;
1957 }
1958
Linus Torvalds1da177e2005-04-16 15:20:36 -07001959 return num;
1960}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001961EXPORT_SYMBOL(vsscanf);
1962
1963/**
1964 * sscanf - Unformat a buffer into a list of arguments
1965 * @buf: input buffer
1966 * @fmt: formatting of buffer
1967 * @...: resulting arguments
1968 */
1969int sscanf(const char * buf, const char * fmt, ...)
1970{
1971 va_list args;
1972 int i;
1973
1974 va_start(args,fmt);
1975 i = vsscanf(buf,fmt,args);
1976 va_end(args);
1977 return i;
1978}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001979EXPORT_SYMBOL(sscanf);