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vsprintf: factor out skip_space code in a separate function
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / lib / vsprintf.c
bloba315138ece55ffd73e5787198545145af5ab540c
1 /*
2 * linux/lib/vsprintf.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
6
7 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
8 /*
9 * Wirzenius wrote this portably, Torvalds fucked it up :-)
10 */
11
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>
25 #include <linux/kallsyms.h>
26 #include <linux/uaccess.h>
27 #include <linux/ioport.h>
28 #include <net/addrconf.h>
29
30 #include <asm/page.h> /* for PAGE_SIZE */
31 #include <asm/div64.h>
32 #include <asm/sections.h> /* for dereference_function_descriptor() */
33
34 /* Works only for digits and letters, but small and fast */
35 #define TOLOWER(x) ((x) | 0x20)
36
37 static 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
49 /**
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 */
55 unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
56 {
57 unsigned long result = 0;
58
59 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;
72 cp++;
73 }
74 if (endp)
75 *endp = (char *)cp;
76
77 return result;
78 }
79 EXPORT_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 */
87 long simple_strtol(const char *cp, char **endp, unsigned int base)
88 {
89 if (*cp == '-')
90 return -simple_strtoul(cp + 1, endp, base);
91
92 return simple_strtoul(cp, endp, base);
93 }
94 EXPORT_SYMBOL(simple_strtol);
95
96 /**
97 * simple_strtoull - convert a string to an unsigned long long
98 * @cp: The start of the string
99 * @endp: A pointer to the end of the parsed string will be placed here
100 * @base: The number base to use
101 */
102 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
103 {
104 unsigned long long result = 0;
105
106 if (!base)
107 base = simple_guess_base(cp);
108
109 if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x')
110 cp += 2;
111
112 while (isxdigit(*cp)) {
113 unsigned int value;
114
115 value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10;
116 if (value >= base)
117 break;
118 result = result * base + value;
119 cp++;
120 }
121 if (endp)
122 *endp = (char *)cp;
123
124 return result;
125 }
126 EXPORT_SYMBOL(simple_strtoull);
127
128 /**
129 * simple_strtoll - convert a string to a signed long long
130 * @cp: The start of the string
131 * @endp: A pointer to the end of the parsed string will be placed here
132 * @base: The number base to use
133 */
134 long long simple_strtoll(const char *cp, char **endp, unsigned int base)
135 {
136 if (*cp == '-')
137 return -simple_strtoull(cp + 1, endp, base);
138
139 return simple_strtoull(cp, endp, base);
140 }
141
142 /**
143 * strict_strtoul - convert a string to an unsigned long strictly
144 * @cp: The string to be converted
145 * @base: The number base to use
146 * @res: The converted result value
147 *
148 * strict_strtoul converts a string to an unsigned long only if the
149 * string is really an unsigned long string, any string containing
150 * any invalid char at the tail will be rejected and -EINVAL is returned,
151 * only a newline char at the tail is acceptible because people generally
152 * change a module parameter in the following way:
153 *
154 * echo 1024 > /sys/module/e1000/parameters/copybreak
155 *
156 * echo will append a newline to the tail.
157 *
158 * It returns 0 if conversion is successful and *res is set to the converted
159 * value, otherwise it returns -EINVAL and *res is set to 0.
160 *
161 * simple_strtoul just ignores the successive invalid characters and
162 * return the converted value of prefix part of the string.
163 */
164 int strict_strtoul(const char *cp, unsigned int base, unsigned long *res)
165 {
166 char *tail;
167 unsigned long val;
168 size_t len;
169
170 *res = 0;
171 len = strlen(cp);
172 if (len == 0)
173 return -EINVAL;
174
175 val = simple_strtoul(cp, &tail, base);
176 if (tail == cp)
177 return -EINVAL;
178
179 if ((*tail == '\0') ||
180 ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {
181 *res = val;
182 return 0;
183 }
184
185 return -EINVAL;
186 }
187 EXPORT_SYMBOL(strict_strtoul);
188
189 /**
190 * strict_strtol - convert a string to a long strictly
191 * @cp: The string to be converted
192 * @base: The number base to use
193 * @res: The converted result value
194 *
195 * strict_strtol is similiar to strict_strtoul, but it allows the first
196 * character of a string is '-'.
197 *
198 * It returns 0 if conversion is successful and *res is set to the converted
199 * value, otherwise it returns -EINVAL and *res is set to 0.
200 */
201 int strict_strtol(const char *cp, unsigned int base, long *res)
202 {
203 int ret;
204 if (*cp == '-') {
205 ret = strict_strtoul(cp + 1, base, (unsigned long *)res);
206 if (!ret)
207 *res = -(*res);
208 } else {
209 ret = strict_strtoul(cp, base, (unsigned long *)res);
210 }
211
212 return ret;
213 }
214 EXPORT_SYMBOL(strict_strtol);
215
216 /**
217 * strict_strtoull - convert a string to an unsigned long long strictly
218 * @cp: The string to be converted
219 * @base: The number base to use
220 * @res: The converted result value
221 *
222 * strict_strtoull converts a string to an unsigned long long only if the
223 * string is really an unsigned long long string, any string containing
224 * any invalid char at the tail will be rejected and -EINVAL is returned,
225 * only a newline char at the tail is acceptible because people generally
226 * change a module parameter in the following way:
227 *
228 * echo 1024 > /sys/module/e1000/parameters/copybreak
229 *
230 * echo will append a newline to the tail of the string.
231 *
232 * It returns 0 if conversion is successful and *res is set to the converted
233 * value, otherwise it returns -EINVAL and *res is set to 0.
234 *
235 * simple_strtoull just ignores the successive invalid characters and
236 * return the converted value of prefix part of the string.
237 */
238 int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res)
239 {
240 char *tail;
241 unsigned long long val;
242 size_t len;
243
244 *res = 0;
245 len = strlen(cp);
246 if (len == 0)
247 return -EINVAL;
248
249 val = simple_strtoull(cp, &tail, base);
250 if (tail == cp)
251 return -EINVAL;
252 if ((*tail == '\0') ||
253 ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {
254 *res = val;
255 return 0;
256 }
257
258 return -EINVAL;
259 }
260 EXPORT_SYMBOL(strict_strtoull);
261
262 /**
263 * strict_strtoll - convert a string to a long long strictly
264 * @cp: The string to be converted
265 * @base: The number base to use
266 * @res: The converted result value
267 *
268 * strict_strtoll is similiar to strict_strtoull, but it allows the first
269 * character of a string is '-'.
270 *
271 * It returns 0 if conversion is successful and *res is set to the converted
272 * value, otherwise it returns -EINVAL and *res is set to 0.
273 */
274 int strict_strtoll(const char *cp, unsigned int base, long long *res)
275 {
276 int ret;
277 if (*cp == '-') {
278 ret = strict_strtoull(cp + 1, base, (unsigned long long *)res);
279 if (!ret)
280 *res = -(*res);
281 } else {
282 ret = strict_strtoull(cp, base, (unsigned long long *)res);
283 }
284
285 return ret;
286 }
287 EXPORT_SYMBOL(strict_strtoll);
288
289 static int skip_atoi(const char **s)
290 {
291 int i = 0;
292
293 while (isdigit(**s))
294 i = i*10 + *((*s)++) - '0';
295
296 return i;
297 }
298
299 /* Decimal conversion is by far the most typical, and is used
300 * for /proc and /sys data. This directly impacts e.g. top performance
301 * with many processes running. We optimize it for speed
302 * using code from
303 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
304 * (with permission from the author, Douglas W. Jones). */
305
306 /* Formats correctly any integer in [0,99999].
307 * Outputs from one to five digits depending on input.
308 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
309 static char *put_dec_trunc(char *buf, unsigned q)
310 {
311 unsigned d3, d2, d1, d0;
312 d1 = (q>>4) & 0xf;
313 d2 = (q>>8) & 0xf;
314 d3 = (q>>12);
315
316 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
317 q = (d0 * 0xcd) >> 11;
318 d0 = d0 - 10*q;
319 *buf++ = d0 + '0'; /* least significant digit */
320 d1 = q + 9*d3 + 5*d2 + d1;
321 if (d1 != 0) {
322 q = (d1 * 0xcd) >> 11;
323 d1 = d1 - 10*q;
324 *buf++ = d1 + '0'; /* next digit */
325
326 d2 = q + 2*d2;
327 if ((d2 != 0) || (d3 != 0)) {
328 q = (d2 * 0xd) >> 7;
329 d2 = d2 - 10*q;
330 *buf++ = d2 + '0'; /* next digit */
331
332 d3 = q + 4*d3;
333 if (d3 != 0) {
334 q = (d3 * 0xcd) >> 11;
335 d3 = d3 - 10*q;
336 *buf++ = d3 + '0'; /* next digit */
337 if (q != 0)
338 *buf++ = q + '0'; /* most sign. digit */
339 }
340 }
341 }
342
343 return buf;
344 }
345 /* Same with if's removed. Always emits five digits */
346 static char *put_dec_full(char *buf, unsigned q)
347 {
348 /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
349 /* but anyway, gcc produces better code with full-sized ints */
350 unsigned d3, d2, d1, d0;
351 d1 = (q>>4) & 0xf;
352 d2 = (q>>8) & 0xf;
353 d3 = (q>>12);
354
355 /*
356 * Possible ways to approx. divide by 10
357 * gcc -O2 replaces multiply with shifts and adds
358 * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
359 * (x * 0x67) >> 10: 1100111
360 * (x * 0x34) >> 9: 110100 - same
361 * (x * 0x1a) >> 8: 11010 - same
362 * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
363 */
364 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
365 q = (d0 * 0xcd) >> 11;
366 d0 = d0 - 10*q;
367 *buf++ = d0 + '0';
368 d1 = q + 9*d3 + 5*d2 + d1;
369 q = (d1 * 0xcd) >> 11;
370 d1 = d1 - 10*q;
371 *buf++ = d1 + '0';
372
373 d2 = q + 2*d2;
374 q = (d2 * 0xd) >> 7;
375 d2 = d2 - 10*q;
376 *buf++ = d2 + '0';
377
378 d3 = q + 4*d3;
379 q = (d3 * 0xcd) >> 11; /* - shorter code */
380 /* q = (d3 * 0x67) >> 10; - would also work */
381 d3 = d3 - 10*q;
382 *buf++ = d3 + '0';
383 *buf++ = q + '0';
384
385 return buf;
386 }
387 /* No inlining helps gcc to use registers better */
388 static noinline char *put_dec(char *buf, unsigned long long num)
389 {
390 while (1) {
391 unsigned rem;
392 if (num < 100000)
393 return put_dec_trunc(buf, num);
394 rem = do_div(num, 100000);
395 buf = put_dec_full(buf, rem);
396 }
397 }
398
399 #define ZEROPAD 1 /* pad with zero */
400 #define SIGN 2 /* unsigned/signed long */
401 #define PLUS 4 /* show plus */
402 #define SPACE 8 /* space if plus */
403 #define LEFT 16 /* left justified */
404 #define SMALL 32 /* Must be 32 == 0x20 */
405 #define SPECIAL 64 /* 0x */
406
407 enum format_type {
408 FORMAT_TYPE_NONE, /* Just a string part */
409 FORMAT_TYPE_WIDTH,
410 FORMAT_TYPE_PRECISION,
411 FORMAT_TYPE_CHAR,
412 FORMAT_TYPE_STR,
413 FORMAT_TYPE_PTR,
414 FORMAT_TYPE_PERCENT_CHAR,
415 FORMAT_TYPE_INVALID,
416 FORMAT_TYPE_LONG_LONG,
417 FORMAT_TYPE_ULONG,
418 FORMAT_TYPE_LONG,
419 FORMAT_TYPE_UBYTE,
420 FORMAT_TYPE_BYTE,
421 FORMAT_TYPE_USHORT,
422 FORMAT_TYPE_SHORT,
423 FORMAT_TYPE_UINT,
424 FORMAT_TYPE_INT,
425 FORMAT_TYPE_NRCHARS,
426 FORMAT_TYPE_SIZE_T,
427 FORMAT_TYPE_PTRDIFF
428 };
429
430 struct printf_spec {
431 enum format_type type;
432 int flags; /* flags to number() */
433 int field_width; /* width of output field */
434 int base;
435 int precision; /* # of digits/chars */
436 int qualifier;
437 };
438
439 static char *number(char *buf, char *end, unsigned long long num,
440 struct printf_spec spec)
441 {
442 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
443 static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
444
445 char tmp[66];
446 char sign;
447 char locase;
448 int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
449 int i;
450
451 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
452 * produces same digits or (maybe lowercased) letters */
453 locase = (spec.flags & SMALL);
454 if (spec.flags & LEFT)
455 spec.flags &= ~ZEROPAD;
456 sign = 0;
457 if (spec.flags & SIGN) {
458 if ((signed long long)num < 0) {
459 sign = '-';
460 num = -(signed long long)num;
461 spec.field_width--;
462 } else if (spec.flags & PLUS) {
463 sign = '+';
464 spec.field_width--;
465 } else if (spec.flags & SPACE) {
466 sign = ' ';
467 spec.field_width--;
468 }
469 }
470 if (need_pfx) {
471 spec.field_width--;
472 if (spec.base == 16)
473 spec.field_width--;
474 }
475
476 /* generate full string in tmp[], in reverse order */
477 i = 0;
478 if (num == 0)
479 tmp[i++] = '0';
480 /* Generic code, for any base:
481 else do {
482 tmp[i++] = (digits[do_div(num,base)] | locase);
483 } while (num != 0);
484 */
485 else if (spec.base != 10) { /* 8 or 16 */
486 int mask = spec.base - 1;
487 int shift = 3;
488
489 if (spec.base == 16)
490 shift = 4;
491 do {
492 tmp[i++] = (digits[((unsigned char)num) & mask] | locase);
493 num >>= shift;
494 } while (num);
495 } else { /* base 10 */
496 i = put_dec(tmp, num) - tmp;
497 }
498
499 /* printing 100 using %2d gives "100", not "00" */
500 if (i > spec.precision)
501 spec.precision = i;
502 /* leading space padding */
503 spec.field_width -= spec.precision;
504 if (!(spec.flags & (ZEROPAD+LEFT))) {
505 while (--spec.field_width >= 0) {
506 if (buf < end)
507 *buf = ' ';
508 ++buf;
509 }
510 }
511 /* sign */
512 if (sign) {
513 if (buf < end)
514 *buf = sign;
515 ++buf;
516 }
517 /* "0x" / "0" prefix */
518 if (need_pfx) {
519 if (buf < end)
520 *buf = '0';
521 ++buf;
522 if (spec.base == 16) {
523 if (buf < end)
524 *buf = ('X' | locase);
525 ++buf;
526 }
527 }
528 /* zero or space padding */
529 if (!(spec.flags & LEFT)) {
530 char c = (spec.flags & ZEROPAD) ? '0' : ' ';
531 while (--spec.field_width >= 0) {
532 if (buf < end)
533 *buf = c;
534 ++buf;
535 }
536 }
537 /* hmm even more zero padding? */
538 while (i <= --spec.precision) {
539 if (buf < end)
540 *buf = '0';
541 ++buf;
542 }
543 /* actual digits of result */
544 while (--i >= 0) {
545 if (buf < end)
546 *buf = tmp[i];
547 ++buf;
548 }
549 /* trailing space padding */
550 while (--spec.field_width >= 0) {
551 if (buf < end)
552 *buf = ' ';
553 ++buf;
554 }
555
556 return buf;
557 }
558
559 static char *string(char *buf, char *end, const char *s, struct printf_spec spec)
560 {
561 int len, i;
562
563 if ((unsigned long)s < PAGE_SIZE)
564 s = "(null)";
565
566 len = strnlen(s, spec.precision);
567
568 if (!(spec.flags & LEFT)) {
569 while (len < spec.field_width--) {
570 if (buf < end)
571 *buf = ' ';
572 ++buf;
573 }
574 }
575 for (i = 0; i < len; ++i) {
576 if (buf < end)
577 *buf = *s;
578 ++buf; ++s;
579 }
580 while (len < spec.field_width--) {
581 if (buf < end)
582 *buf = ' ';
583 ++buf;
584 }
585
586 return buf;
587 }
588
589 static char *symbol_string(char *buf, char *end, void *ptr,
590 struct printf_spec spec, char ext)
591 {
592 unsigned long value = (unsigned long) ptr;
593 #ifdef CONFIG_KALLSYMS
594 char sym[KSYM_SYMBOL_LEN];
595 if (ext != 'f' && ext != 's')
596 sprint_symbol(sym, value);
597 else
598 kallsyms_lookup(value, NULL, NULL, NULL, sym);
599
600 return string(buf, end, sym, spec);
601 #else
602 spec.field_width = 2 * sizeof(void *);
603 spec.flags |= SPECIAL | SMALL | ZEROPAD;
604 spec.base = 16;
605
606 return number(buf, end, value, spec);
607 #endif
608 }
609
610 static char *resource_string(char *buf, char *end, struct resource *res,
611 struct printf_spec spec, const char *fmt)
612 {
613 #ifndef IO_RSRC_PRINTK_SIZE
614 #define IO_RSRC_PRINTK_SIZE 6
615 #endif
616
617 #ifndef MEM_RSRC_PRINTK_SIZE
618 #define MEM_RSRC_PRINTK_SIZE 10
619 #endif
620 struct printf_spec hex_spec = {
621 .base = 16,
622 .precision = -1,
623 .flags = SPECIAL | SMALL | ZEROPAD,
624 };
625 struct printf_spec dec_spec = {
626 .base = 10,
627 .precision = -1,
628 .flags = 0,
629 };
630 struct printf_spec str_spec = {
631 .field_width = -1,
632 .precision = 10,
633 .flags = LEFT,
634 };
635 struct printf_spec flag_spec = {
636 .base = 16,
637 .precision = -1,
638 .flags = SPECIAL | SMALL,
639 };
640
641 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
642 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
643 #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
644 #define FLAG_BUF_SIZE (2 * sizeof(res->flags))
645 #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref disabled]")
646 #define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
647 char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
648 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
649
650 char *p = sym, *pend = sym + sizeof(sym);
651 int size = -1, addr = 0;
652 int decode = (fmt[0] == 'R') ? 1 : 0;
653
654 if (res->flags & IORESOURCE_IO) {
655 size = IO_RSRC_PRINTK_SIZE;
656 addr = 1;
657 } else if (res->flags & IORESOURCE_MEM) {
658 size = MEM_RSRC_PRINTK_SIZE;
659 addr = 1;
660 }
661
662 *p++ = '[';
663 if (res->flags & IORESOURCE_IO)
664 p = string(p, pend, "io ", str_spec);
665 else if (res->flags & IORESOURCE_MEM)
666 p = string(p, pend, "mem ", str_spec);
667 else if (res->flags & IORESOURCE_IRQ)
668 p = string(p, pend, "irq ", str_spec);
669 else if (res->flags & IORESOURCE_DMA)
670 p = string(p, pend, "dma ", str_spec);
671 else {
672 p = string(p, pend, "??? ", str_spec);
673 decode = 0;
674 }
675 hex_spec.field_width = size;
676 p = number(p, pend, res->start, addr ? hex_spec : dec_spec);
677 if (res->start != res->end) {
678 *p++ = '-';
679 p = number(p, pend, res->end, addr ? hex_spec : dec_spec);
680 }
681 if (decode) {
682 if (res->flags & IORESOURCE_MEM_64)
683 p = string(p, pend, " 64bit", str_spec);
684 if (res->flags & IORESOURCE_PREFETCH)
685 p = string(p, pend, " pref", str_spec);
686 if (res->flags & IORESOURCE_DISABLED)
687 p = string(p, pend, " disabled", str_spec);
688 } else {
689 p = string(p, pend, " flags ", str_spec);
690 p = number(p, pend, res->flags, flag_spec);
691 }
692 *p++ = ']';
693 *p = '\0';
694
695 return string(buf, end, sym, spec);
696 }
697
698 static char *mac_address_string(char *buf, char *end, u8 *addr,
699 struct printf_spec spec, const char *fmt)
700 {
701 char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
702 char *p = mac_addr;
703 int i;
704
705 for (i = 0; i < 6; i++) {
706 p = pack_hex_byte(p, addr[i]);
707 if (fmt[0] == 'M' && i != 5)
708 *p++ = ':';
709 }
710 *p = '\0';
711
712 return string(buf, end, mac_addr, spec);
713 }
714
715 static char *ip4_string(char *p, const u8 *addr, bool leading_zeros)
716 {
717 int i;
718
719 for (i = 0; i < 4; i++) {
720 char temp[3]; /* hold each IP quad in reverse order */
721 int digits = put_dec_trunc(temp, addr[i]) - temp;
722 if (leading_zeros) {
723 if (digits < 3)
724 *p++ = '0';
725 if (digits < 2)
726 *p++ = '0';
727 }
728 /* reverse the digits in the quad */
729 while (digits--)
730 *p++ = temp[digits];
731 if (i < 3)
732 *p++ = '.';
733 }
734 *p = '\0';
735
736 return p;
737 }
738
739 static char *ip6_compressed_string(char *p, const char *addr)
740 {
741 int i, j, range;
742 unsigned char zerolength[8];
743 int longest = 1;
744 int colonpos = -1;
745 u16 word;
746 u8 hi, lo;
747 bool needcolon = false;
748 bool useIPv4;
749 struct in6_addr in6;
750
751 memcpy(&in6, addr, sizeof(struct in6_addr));
752
753 useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
754
755 memset(zerolength, 0, sizeof(zerolength));
756
757 if (useIPv4)
758 range = 6;
759 else
760 range = 8;
761
762 /* find position of longest 0 run */
763 for (i = 0; i < range; i++) {
764 for (j = i; j < range; j++) {
765 if (in6.s6_addr16[j] != 0)
766 break;
767 zerolength[i]++;
768 }
769 }
770 for (i = 0; i < range; i++) {
771 if (zerolength[i] > longest) {
772 longest = zerolength[i];
773 colonpos = i;
774 }
775 }
776
777 /* emit address */
778 for (i = 0; i < range; i++) {
779 if (i == colonpos) {
780 if (needcolon || i == 0)
781 *p++ = ':';
782 *p++ = ':';
783 needcolon = false;
784 i += longest - 1;
785 continue;
786 }
787 if (needcolon) {
788 *p++ = ':';
789 needcolon = false;
790 }
791 /* hex u16 without leading 0s */
792 word = ntohs(in6.s6_addr16[i]);
793 hi = word >> 8;
794 lo = word & 0xff;
795 if (hi) {
796 if (hi > 0x0f)
797 p = pack_hex_byte(p, hi);
798 else
799 *p++ = hex_asc_lo(hi);
800 p = pack_hex_byte(p, lo);
801 }
802 else if (lo > 0x0f)
803 p = pack_hex_byte(p, lo);
804 else
805 *p++ = hex_asc_lo(lo);
806 needcolon = true;
807 }
808
809 if (useIPv4) {
810 if (needcolon)
811 *p++ = ':';
812 p = ip4_string(p, &in6.s6_addr[12], false);
813 }
814 *p = '\0';
815
816 return p;
817 }
818
819 static char *ip6_string(char *p, const char *addr, const char *fmt)
820 {
821 int i;
822
823 for (i = 0; i < 8; i++) {
824 p = pack_hex_byte(p, *addr++);
825 p = pack_hex_byte(p, *addr++);
826 if (fmt[0] == 'I' && i != 7)
827 *p++ = ':';
828 }
829 *p = '\0';
830
831 return p;
832 }
833
834 static char *ip6_addr_string(char *buf, char *end, const u8 *addr,
835 struct printf_spec spec, const char *fmt)
836 {
837 char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
838
839 if (fmt[0] == 'I' && fmt[2] == 'c')
840 ip6_compressed_string(ip6_addr, addr);
841 else
842 ip6_string(ip6_addr, addr, fmt);
843
844 return string(buf, end, ip6_addr, spec);
845 }
846
847 static char *ip4_addr_string(char *buf, char *end, const u8 *addr,
848 struct printf_spec spec, const char *fmt)
849 {
850 char ip4_addr[sizeof("255.255.255.255")];
851
852 ip4_string(ip4_addr, addr, fmt[0] == 'i');
853
854 return string(buf, end, ip4_addr, spec);
855 }
856
857 /*
858 * Show a '%p' thing. A kernel extension is that the '%p' is followed
859 * by an extra set of alphanumeric characters that are extended format
860 * specifiers.
861 *
862 * Right now we handle:
863 *
864 * - 'F' For symbolic function descriptor pointers with offset
865 * - 'f' For simple symbolic function names without offset
866 * - 'S' For symbolic direct pointers with offset
867 * - 's' For symbolic direct pointers without offset
868 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
869 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
870 * - 'M' For a 6-byte MAC address, it prints the address in the
871 * usual colon-separated hex notation
872 * - 'm' For a 6-byte MAC address, it prints the hex address without colons
873 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
874 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
875 * IPv6 uses colon separated network-order 16 bit hex with leading 0's
876 * - 'i' [46] for 'raw' IPv4/IPv6 addresses
877 * IPv6 omits the colons (01020304...0f)
878 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
879 * - 'I6c' for IPv6 addresses printed as specified by
880 * http://www.ietf.org/id/draft-kawamura-ipv6-text-representation-03.txt
881 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
882 * function pointers are really function descriptors, which contain a
883 * pointer to the real address.
884 */
885 static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
886 struct printf_spec spec)
887 {
888 if (!ptr)
889 return string(buf, end, "(null)", spec);
890
891 switch (*fmt) {
892 case 'F':
893 case 'f':
894 ptr = dereference_function_descriptor(ptr);
895 /* Fallthrough */
896 case 's':
897 case 'S':
898 return symbol_string(buf, end, ptr, spec, *fmt);
899 case 'R':
900 case 'r':
901 return resource_string(buf, end, ptr, spec, fmt);
902 case 'M': /* Colon separated: 00:01:02:03:04:05 */
903 case 'm': /* Contiguous: 000102030405 */
904 return mac_address_string(buf, end, ptr, spec, fmt);
905 case 'I': /* Formatted IP supported
906 * 4: 1.2.3.4
907 * 6: 0001:0203:...:0708
908 * 6c: 1::708 or 1::1.2.3.4
909 */
910 case 'i': /* Contiguous:
911 * 4: 001.002.003.004
912 * 6: 000102...0f
913 */
914 switch (fmt[1]) {
915 case '6':
916 return ip6_addr_string(buf, end, ptr, spec, fmt);
917 case '4':
918 return ip4_addr_string(buf, end, ptr, spec, fmt);
919 }
920 break;
921 }
922 spec.flags |= SMALL;
923 if (spec.field_width == -1) {
924 spec.field_width = 2*sizeof(void *);
925 spec.flags |= ZEROPAD;
926 }
927 spec.base = 16;
928
929 return number(buf, end, (unsigned long) ptr, spec);
930 }
931
932 /*
933 * Helper function to decode printf style format.
934 * Each call decode a token from the format and return the
935 * number of characters read (or likely the delta where it wants
936 * to go on the next call).
937 * The decoded token is returned through the parameters
938 *
939 * 'h', 'l', or 'L' for integer fields
940 * 'z' support added 23/7/1999 S.H.
941 * 'z' changed to 'Z' --davidm 1/25/99
942 * 't' added for ptrdiff_t
943 *
944 * @fmt: the format string
945 * @type of the token returned
946 * @flags: various flags such as +, -, # tokens..
947 * @field_width: overwritten width
948 * @base: base of the number (octal, hex, ...)
949 * @precision: precision of a number
950 * @qualifier: qualifier of a number (long, size_t, ...)
951 */
952 static int format_decode(const char *fmt, struct printf_spec *spec)
953 {
954 const char *start = fmt;
955
956 /* we finished early by reading the field width */
957 if (spec->type == FORMAT_TYPE_WIDTH) {
958 if (spec->field_width < 0) {
959 spec->field_width = -spec->field_width;
960 spec->flags |= LEFT;
961 }
962 spec->type = FORMAT_TYPE_NONE;
963 goto precision;
964 }
965
966 /* we finished early by reading the precision */
967 if (spec->type == FORMAT_TYPE_PRECISION) {
968 if (spec->precision < 0)
969 spec->precision = 0;
970
971 spec->type = FORMAT_TYPE_NONE;
972 goto qualifier;
973 }
974
975 /* By default */
976 spec->type = FORMAT_TYPE_NONE;
977
978 for (; *fmt ; ++fmt) {
979 if (*fmt == '%')
980 break;
981 }
982
983 /* Return the current non-format string */
984 if (fmt != start || !*fmt)
985 return fmt - start;
986
987 /* Process flags */
988 spec->flags = 0;
989
990 while (1) { /* this also skips first '%' */
991 bool found = true;
992
993 ++fmt;
994
995 switch (*fmt) {
996 case '-': spec->flags |= LEFT; break;
997 case '+': spec->flags |= PLUS; break;
998 case ' ': spec->flags |= SPACE; break;
999 case '#': spec->flags |= SPECIAL; break;
1000 case '0': spec->flags |= ZEROPAD; break;
1001 default: found = false;
1002 }
1003
1004 if (!found)
1005 break;
1006 }
1007
1008 /* get field width */
1009 spec->field_width = -1;
1010
1011 if (isdigit(*fmt))
1012 spec->field_width = skip_atoi(&fmt);
1013 else if (*fmt == '*') {
1014 /* it's the next argument */
1015 spec->type = FORMAT_TYPE_WIDTH;
1016 return ++fmt - start;
1017 }
1018
1019 precision:
1020 /* get the precision */
1021 spec->precision = -1;
1022 if (*fmt == '.') {
1023 ++fmt;
1024 if (isdigit(*fmt)) {
1025 spec->precision = skip_atoi(&fmt);
1026 if (spec->precision < 0)
1027 spec->precision = 0;
1028 } else if (*fmt == '*') {
1029 /* it's the next argument */
1030 spec->type = FORMAT_TYPE_PRECISION;
1031 return ++fmt - start;
1032 }
1033 }
1034
1035 qualifier:
1036 /* get the conversion qualifier */
1037 spec->qualifier = -1;
1038 if (*fmt == 'h' || TOLOWER(*fmt) == 'l' ||
1039 TOLOWER(*fmt) == 'z' || *fmt == 't') {
1040 spec->qualifier = *fmt++;
1041 if (unlikely(spec->qualifier == *fmt)) {
1042 if (spec->qualifier == 'l') {
1043 spec->qualifier = 'L';
1044 ++fmt;
1045 } else if (spec->qualifier == 'h') {
1046 spec->qualifier = 'H';
1047 ++fmt;
1048 }
1049 }
1050 }
1051
1052 /* default base */
1053 spec->base = 10;
1054 switch (*fmt) {
1055 case 'c':
1056 spec->type = FORMAT_TYPE_CHAR;
1057 return ++fmt - start;
1058
1059 case 's':
1060 spec->type = FORMAT_TYPE_STR;
1061 return ++fmt - start;
1062
1063 case 'p':
1064 spec->type = FORMAT_TYPE_PTR;
1065 return fmt - start;
1066 /* skip alnum */
1067
1068 case 'n':
1069 spec->type = FORMAT_TYPE_NRCHARS;
1070 return ++fmt - start;
1071
1072 case '%':
1073 spec->type = FORMAT_TYPE_PERCENT_CHAR;
1074 return ++fmt - start;
1075
1076 /* integer number formats - set up the flags and "break" */
1077 case 'o':
1078 spec->base = 8;
1079 break;
1080
1081 case 'x':
1082 spec->flags |= SMALL;
1083
1084 case 'X':
1085 spec->base = 16;
1086 break;
1087
1088 case 'd':
1089 case 'i':
1090 spec->flags |= SIGN;
1091 case 'u':
1092 break;
1093
1094 default:
1095 spec->type = FORMAT_TYPE_INVALID;
1096 return fmt - start;
1097 }
1098
1099 if (spec->qualifier == 'L')
1100 spec->type = FORMAT_TYPE_LONG_LONG;
1101 else if (spec->qualifier == 'l') {
1102 if (spec->flags & SIGN)
1103 spec->type = FORMAT_TYPE_LONG;
1104 else
1105 spec->type = FORMAT_TYPE_ULONG;
1106 } else if (TOLOWER(spec->qualifier) == 'z') {
1107 spec->type = FORMAT_TYPE_SIZE_T;
1108 } else if (spec->qualifier == 't') {
1109 spec->type = FORMAT_TYPE_PTRDIFF;
1110 } else if (spec->qualifier == 'H') {
1111 if (spec->flags & SIGN)
1112 spec->type = FORMAT_TYPE_BYTE;
1113 else
1114 spec->type = FORMAT_TYPE_UBYTE;
1115 } else if (spec->qualifier == 'h') {
1116 if (spec->flags & SIGN)
1117 spec->type = FORMAT_TYPE_SHORT;
1118 else
1119 spec->type = FORMAT_TYPE_USHORT;
1120 } else {
1121 if (spec->flags & SIGN)
1122 spec->type = FORMAT_TYPE_INT;
1123 else
1124 spec->type = FORMAT_TYPE_UINT;
1125 }
1126
1127 return ++fmt - start;
1128 }
1129
1130 /**
1131 * vsnprintf - Format a string and place it in a buffer
1132 * @buf: The buffer to place the result into
1133 * @size: The size of the buffer, including the trailing null space
1134 * @fmt: The format string to use
1135 * @args: Arguments for the format string
1136 *
1137 * This function follows C99 vsnprintf, but has some extensions:
1138 * %pS output the name of a text symbol with offset
1139 * %ps output the name of a text symbol without offset
1140 * %pF output the name of a function pointer with its offset
1141 * %pf output the name of a function pointer without its offset
1142 * %pR output the address range in a struct resource
1143 * %n is ignored
1144 *
1145 * The return value is the number of characters which would
1146 * be generated for the given input, excluding the trailing
1147 * '\0', as per ISO C99. If you want to have the exact
1148 * number of characters written into @buf as return value
1149 * (not including the trailing '\0'), use vscnprintf(). If the
1150 * return is greater than or equal to @size, the resulting
1151 * string is truncated.
1152 *
1153 * Call this function if you are already dealing with a va_list.
1154 * You probably want snprintf() instead.
1155 */
1156 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
1157 {
1158 unsigned long long num;
1159 char *str, *end;
1160 struct printf_spec spec = {0};
1161
1162 /* Reject out-of-range values early. Large positive sizes are
1163 used for unknown buffer sizes. */
1164 if (WARN_ON_ONCE((int) size < 0))
1165 return 0;
1166
1167 str = buf;
1168 end = buf + size;
1169
1170 /* Make sure end is always >= buf */
1171 if (end < buf) {
1172 end = ((void *)-1);
1173 size = end - buf;
1174 }
1175
1176 while (*fmt) {
1177 const char *old_fmt = fmt;
1178 int read = format_decode(fmt, &spec);
1179
1180 fmt += read;
1181
1182 switch (spec.type) {
1183 case FORMAT_TYPE_NONE: {
1184 int copy = read;
1185 if (str < end) {
1186 if (copy > end - str)
1187 copy = end - str;
1188 memcpy(str, old_fmt, copy);
1189 }
1190 str += read;
1191 break;
1192 }
1193
1194 case FORMAT_TYPE_WIDTH:
1195 spec.field_width = va_arg(args, int);
1196 break;
1197
1198 case FORMAT_TYPE_PRECISION:
1199 spec.precision = va_arg(args, int);
1200 break;
1201
1202 case FORMAT_TYPE_CHAR: {
1203 char c;
1204
1205 if (!(spec.flags & LEFT)) {
1206 while (--spec.field_width > 0) {
1207 if (str < end)
1208 *str = ' ';
1209 ++str;
1210
1211 }
1212 }
1213 c = (unsigned char) va_arg(args, int);
1214 if (str < end)
1215 *str = c;
1216 ++str;
1217 while (--spec.field_width > 0) {
1218 if (str < end)
1219 *str = ' ';
1220 ++str;
1221 }
1222 break;
1223 }
1224
1225 case FORMAT_TYPE_STR:
1226 str = string(str, end, va_arg(args, char *), spec);
1227 break;
1228
1229 case FORMAT_TYPE_PTR:
1230 str = pointer(fmt+1, str, end, va_arg(args, void *),
1231 spec);
1232 while (isalnum(*fmt))
1233 fmt++;
1234 break;
1235
1236 case FORMAT_TYPE_PERCENT_CHAR:
1237 if (str < end)
1238 *str = '%';
1239 ++str;
1240 break;
1241
1242 case FORMAT_TYPE_INVALID:
1243 if (str < end)
1244 *str = '%';
1245 ++str;
1246 break;
1247
1248 case FORMAT_TYPE_NRCHARS: {
1249 int qualifier = spec.qualifier;
1250
1251 if (qualifier == 'l') {
1252 long *ip = va_arg(args, long *);
1253 *ip = (str - buf);
1254 } else if (TOLOWER(qualifier) == 'z') {
1255 size_t *ip = va_arg(args, size_t *);
1256 *ip = (str - buf);
1257 } else {
1258 int *ip = va_arg(args, int *);
1259 *ip = (str - buf);
1260 }
1261 break;
1262 }
1263
1264 default:
1265 switch (spec.type) {
1266 case FORMAT_TYPE_LONG_LONG:
1267 num = va_arg(args, long long);
1268 break;
1269 case FORMAT_TYPE_ULONG:
1270 num = va_arg(args, unsigned long);
1271 break;
1272 case FORMAT_TYPE_LONG:
1273 num = va_arg(args, long);
1274 break;
1275 case FORMAT_TYPE_SIZE_T:
1276 num = va_arg(args, size_t);
1277 break;
1278 case FORMAT_TYPE_PTRDIFF:
1279 num = va_arg(args, ptrdiff_t);
1280 break;
1281 case FORMAT_TYPE_UBYTE:
1282 num = (unsigned char) va_arg(args, int);
1283 break;
1284 case FORMAT_TYPE_BYTE:
1285 num = (signed char) va_arg(args, int);
1286 break;
1287 case FORMAT_TYPE_USHORT:
1288 num = (unsigned short) va_arg(args, int);
1289 break;
1290 case FORMAT_TYPE_SHORT:
1291 num = (short) va_arg(args, int);
1292 break;
1293 case FORMAT_TYPE_INT:
1294 num = (int) va_arg(args, int);
1295 break;
1296 default:
1297 num = va_arg(args, unsigned int);
1298 }
1299
1300 str = number(str, end, num, spec);
1301 }
1302 }
1303
1304 if (size > 0) {
1305 if (str < end)
1306 *str = '\0';
1307 else
1308 end[-1] = '\0';
1309 }
1310
1311 /* the trailing null byte doesn't count towards the total */
1312 return str-buf;
1313
1314 }
1315 EXPORT_SYMBOL(vsnprintf);
1316
1317 /**
1318 * vscnprintf - Format a string and place it in a buffer
1319 * @buf: The buffer to place the result into
1320 * @size: The size of the buffer, including the trailing null space
1321 * @fmt: The format string to use
1322 * @args: Arguments for the format string
1323 *
1324 * The return value is the number of characters which have been written into
1325 * the @buf not including the trailing '\0'. If @size is <= 0 the function
1326 * returns 0.
1327 *
1328 * Call this function if you are already dealing with a va_list.
1329 * You probably want scnprintf() instead.
1330 *
1331 * See the vsnprintf() documentation for format string extensions over C99.
1332 */
1333 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
1334 {
1335 int i;
1336
1337 i = vsnprintf(buf, size, fmt, args);
1338
1339 return (i >= size) ? (size - 1) : i;
1340 }
1341 EXPORT_SYMBOL(vscnprintf);
1342
1343 /**
1344 * snprintf - Format a string and place it in a buffer
1345 * @buf: The buffer to place the result into
1346 * @size: The size of the buffer, including the trailing null space
1347 * @fmt: The format string to use
1348 * @...: Arguments for the format string
1349 *
1350 * The return value is the number of characters which would be
1351 * generated for the given input, excluding the trailing null,
1352 * as per ISO C99. If the return is greater than or equal to
1353 * @size, the resulting string is truncated.
1354 *
1355 * See the vsnprintf() documentation for format string extensions over C99.
1356 */
1357 int snprintf(char *buf, size_t size, const char *fmt, ...)
1358 {
1359 va_list args;
1360 int i;
1361
1362 va_start(args, fmt);
1363 i = vsnprintf(buf, size, fmt, args);
1364 va_end(args);
1365
1366 return i;
1367 }
1368 EXPORT_SYMBOL(snprintf);
1369
1370 /**
1371 * scnprintf - Format a string and place it in a buffer
1372 * @buf: The buffer to place the result into
1373 * @size: The size of the buffer, including the trailing null space
1374 * @fmt: The format string to use
1375 * @...: Arguments for the format string
1376 *
1377 * The return value is the number of characters written into @buf not including
1378 * the trailing '\0'. If @size is <= 0 the function returns 0.
1379 */
1380
1381 int scnprintf(char *buf, size_t size, const char *fmt, ...)
1382 {
1383 va_list args;
1384 int i;
1385
1386 va_start(args, fmt);
1387 i = vsnprintf(buf, size, fmt, args);
1388 va_end(args);
1389
1390 return (i >= size) ? (size - 1) : i;
1391 }
1392 EXPORT_SYMBOL(scnprintf);
1393
1394 /**
1395 * vsprintf - Format a string and place it in a buffer
1396 * @buf: The buffer to place the result into
1397 * @fmt: The format string to use
1398 * @args: Arguments for the format string
1399 *
1400 * The function returns the number of characters written
1401 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
1402 * buffer overflows.
1403 *
1404 * Call this function if you are already dealing with a va_list.
1405 * You probably want sprintf() instead.
1406 *
1407 * See the vsnprintf() documentation for format string extensions over C99.
1408 */
1409 int vsprintf(char *buf, const char *fmt, va_list args)
1410 {
1411 return vsnprintf(buf, INT_MAX, fmt, args);
1412 }
1413 EXPORT_SYMBOL(vsprintf);
1414
1415 /**
1416 * sprintf - Format a string and place it in a buffer
1417 * @buf: The buffer to place the result into
1418 * @fmt: The format string to use
1419 * @...: Arguments for the format string
1420 *
1421 * The function returns the number of characters written
1422 * into @buf. Use snprintf() or scnprintf() in order to avoid
1423 * buffer overflows.
1424 *
1425 * See the vsnprintf() documentation for format string extensions over C99.
1426 */
1427 int sprintf(char *buf, const char *fmt, ...)
1428 {
1429 va_list args;
1430 int i;
1431
1432 va_start(args, fmt);
1433 i = vsnprintf(buf, INT_MAX, fmt, args);
1434 va_end(args);
1435
1436 return i;
1437 }
1438 EXPORT_SYMBOL(sprintf);
1439
1440 #ifdef CONFIG_BINARY_PRINTF
1441 /*
1442 * bprintf service:
1443 * vbin_printf() - VA arguments to binary data
1444 * bstr_printf() - Binary data to text string
1445 */
1446
1447 /**
1448 * vbin_printf - Parse a format string and place args' binary value in a buffer
1449 * @bin_buf: The buffer to place args' binary value
1450 * @size: The size of the buffer(by words(32bits), not characters)
1451 * @fmt: The format string to use
1452 * @args: Arguments for the format string
1453 *
1454 * The format follows C99 vsnprintf, except %n is ignored, and its argument
1455 * is skiped.
1456 *
1457 * The return value is the number of words(32bits) which would be generated for
1458 * the given input.
1459 *
1460 * NOTE:
1461 * If the return value is greater than @size, the resulting bin_buf is NOT
1462 * valid for bstr_printf().
1463 */
1464 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
1465 {
1466 struct printf_spec spec = {0};
1467 char *str, *end;
1468
1469 str = (char *)bin_buf;
1470 end = (char *)(bin_buf + size);
1471
1472 #define save_arg(type) \
1473 do { \
1474 if (sizeof(type) == 8) { \
1475 unsigned long long value; \
1476 str = PTR_ALIGN(str, sizeof(u32)); \
1477 value = va_arg(args, unsigned long long); \
1478 if (str + sizeof(type) <= end) { \
1479 *(u32 *)str = *(u32 *)&value; \
1480 *(u32 *)(str + 4) = *((u32 *)&value + 1); \
1481 } \
1482 } else { \
1483 unsigned long value; \
1484 str = PTR_ALIGN(str, sizeof(type)); \
1485 value = va_arg(args, int); \
1486 if (str + sizeof(type) <= end) \
1487 *(typeof(type) *)str = (type)value; \
1488 } \
1489 str += sizeof(type); \
1490 } while (0)
1491
1492 while (*fmt) {
1493 int read = format_decode(fmt, &spec);
1494
1495 fmt += read;
1496
1497 switch (spec.type) {
1498 case FORMAT_TYPE_NONE:
1499 case FORMAT_TYPE_INVALID:
1500 case FORMAT_TYPE_PERCENT_CHAR:
1501 break;
1502
1503 case FORMAT_TYPE_WIDTH:
1504 case FORMAT_TYPE_PRECISION:
1505 save_arg(int);
1506 break;
1507
1508 case FORMAT_TYPE_CHAR:
1509 save_arg(char);
1510 break;
1511
1512 case FORMAT_TYPE_STR: {
1513 const char *save_str = va_arg(args, char *);
1514 size_t len;
1515
1516 if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
1517 || (unsigned long)save_str < PAGE_SIZE)
1518 save_str = "(null)";
1519 len = strlen(save_str) + 1;
1520 if (str + len < end)
1521 memcpy(str, save_str, len);
1522 str += len;
1523 break;
1524 }
1525
1526 case FORMAT_TYPE_PTR:
1527 save_arg(void *);
1528 /* skip all alphanumeric pointer suffixes */
1529 while (isalnum(*fmt))
1530 fmt++;
1531 break;
1532
1533 case FORMAT_TYPE_NRCHARS: {
1534 /* skip %n 's argument */
1535 int qualifier = spec.qualifier;
1536 void *skip_arg;
1537 if (qualifier == 'l')
1538 skip_arg = va_arg(args, long *);
1539 else if (TOLOWER(qualifier) == 'z')
1540 skip_arg = va_arg(args, size_t *);
1541 else
1542 skip_arg = va_arg(args, int *);
1543 break;
1544 }
1545
1546 default:
1547 switch (spec.type) {
1548
1549 case FORMAT_TYPE_LONG_LONG:
1550 save_arg(long long);
1551 break;
1552 case FORMAT_TYPE_ULONG:
1553 case FORMAT_TYPE_LONG:
1554 save_arg(unsigned long);
1555 break;
1556 case FORMAT_TYPE_SIZE_T:
1557 save_arg(size_t);
1558 break;
1559 case FORMAT_TYPE_PTRDIFF:
1560 save_arg(ptrdiff_t);
1561 break;
1562 case FORMAT_TYPE_UBYTE:
1563 case FORMAT_TYPE_BYTE:
1564 save_arg(char);
1565 break;
1566 case FORMAT_TYPE_USHORT:
1567 case FORMAT_TYPE_SHORT:
1568 save_arg(short);
1569 break;
1570 default:
1571 save_arg(int);
1572 }
1573 }
1574 }
1575
1576 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
1577 #undef save_arg
1578 }
1579 EXPORT_SYMBOL_GPL(vbin_printf);
1580
1581 /**
1582 * bstr_printf - Format a string from binary arguments and place it in a buffer
1583 * @buf: The buffer to place the result into
1584 * @size: The size of the buffer, including the trailing null space
1585 * @fmt: The format string to use
1586 * @bin_buf: Binary arguments for the format string
1587 *
1588 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
1589 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
1590 * a binary buffer that generated by vbin_printf.
1591 *
1592 * The format follows C99 vsnprintf, but has some extensions:
1593 * see vsnprintf comment for details.
1594 *
1595 * The return value is the number of characters which would
1596 * be generated for the given input, excluding the trailing
1597 * '\0', as per ISO C99. If you want to have the exact
1598 * number of characters written into @buf as return value
1599 * (not including the trailing '\0'), use vscnprintf(). If the
1600 * return is greater than or equal to @size, the resulting
1601 * string is truncated.
1602 */
1603 int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
1604 {
1605 struct printf_spec spec = {0};
1606 char *str, *end;
1607 const char *args = (const char *)bin_buf;
1608
1609 if (WARN_ON_ONCE((int) size < 0))
1610 return 0;
1611
1612 str = buf;
1613 end = buf + size;
1614
1615 #define get_arg(type) \
1616 ({ \
1617 typeof(type) value; \
1618 if (sizeof(type) == 8) { \
1619 args = PTR_ALIGN(args, sizeof(u32)); \
1620 *(u32 *)&value = *(u32 *)args; \
1621 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
1622 } else { \
1623 args = PTR_ALIGN(args, sizeof(type)); \
1624 value = *(typeof(type) *)args; \
1625 } \
1626 args += sizeof(type); \
1627 value; \
1628 })
1629
1630 /* Make sure end is always >= buf */
1631 if (end < buf) {
1632 end = ((void *)-1);
1633 size = end - buf;
1634 }
1635
1636 while (*fmt) {
1637 const char *old_fmt = fmt;
1638 int read = format_decode(fmt, &spec);
1639
1640 fmt += read;
1641
1642 switch (spec.type) {
1643 case FORMAT_TYPE_NONE: {
1644 int copy = read;
1645 if (str < end) {
1646 if (copy > end - str)
1647 copy = end - str;
1648 memcpy(str, old_fmt, copy);
1649 }
1650 str += read;
1651 break;
1652 }
1653
1654 case FORMAT_TYPE_WIDTH:
1655 spec.field_width = get_arg(int);
1656 break;
1657
1658 case FORMAT_TYPE_PRECISION:
1659 spec.precision = get_arg(int);
1660 break;
1661
1662 case FORMAT_TYPE_CHAR: {
1663 char c;
1664
1665 if (!(spec.flags & LEFT)) {
1666 while (--spec.field_width > 0) {
1667 if (str < end)
1668 *str = ' ';
1669 ++str;
1670 }
1671 }
1672 c = (unsigned char) get_arg(char);
1673 if (str < end)
1674 *str = c;
1675 ++str;
1676 while (--spec.field_width > 0) {
1677 if (str < end)
1678 *str = ' ';
1679 ++str;
1680 }
1681 break;
1682 }
1683
1684 case FORMAT_TYPE_STR: {
1685 const char *str_arg = args;
1686 args += strlen(str_arg) + 1;
1687 str = string(str, end, (char *)str_arg, spec);
1688 break;
1689 }
1690
1691 case FORMAT_TYPE_PTR:
1692 str = pointer(fmt+1, str, end, get_arg(void *), spec);
1693 while (isalnum(*fmt))
1694 fmt++;
1695 break;
1696
1697 case FORMAT_TYPE_PERCENT_CHAR:
1698 case FORMAT_TYPE_INVALID:
1699 if (str < end)
1700 *str = '%';
1701 ++str;
1702 break;
1703
1704 case FORMAT_TYPE_NRCHARS:
1705 /* skip */
1706 break;
1707
1708 default: {
1709 unsigned long long num;
1710
1711 switch (spec.type) {
1712
1713 case FORMAT_TYPE_LONG_LONG:
1714 num = get_arg(long long);
1715 break;
1716 case FORMAT_TYPE_ULONG:
1717 case FORMAT_TYPE_LONG:
1718 num = get_arg(unsigned long);
1719 break;
1720 case FORMAT_TYPE_SIZE_T:
1721 num = get_arg(size_t);
1722 break;
1723 case FORMAT_TYPE_PTRDIFF:
1724 num = get_arg(ptrdiff_t);
1725 break;
1726 case FORMAT_TYPE_UBYTE:
1727 num = get_arg(unsigned char);
1728 break;
1729 case FORMAT_TYPE_BYTE:
1730 num = get_arg(signed char);
1731 break;
1732 case FORMAT_TYPE_USHORT:
1733 num = get_arg(unsigned short);
1734 break;
1735 case FORMAT_TYPE_SHORT:
1736 num = get_arg(short);
1737 break;
1738 case FORMAT_TYPE_UINT:
1739 num = get_arg(unsigned int);
1740 break;
1741 default:
1742 num = get_arg(int);
1743 }
1744
1745 str = number(str, end, num, spec);
1746 } /* default: */
1747 } /* switch(spec.type) */
1748 } /* while(*fmt) */
1749
1750 if (size > 0) {
1751 if (str < end)
1752 *str = '\0';
1753 else
1754 end[-1] = '\0';
1755 }
1756
1757 #undef get_arg
1758
1759 /* the trailing null byte doesn't count towards the total */
1760 return str - buf;
1761 }
1762 EXPORT_SYMBOL_GPL(bstr_printf);
1763
1764 /**
1765 * bprintf - Parse a format string and place args' binary value in a buffer
1766 * @bin_buf: The buffer to place args' binary value
1767 * @size: The size of the buffer(by words(32bits), not characters)
1768 * @fmt: The format string to use
1769 * @...: Arguments for the format string
1770 *
1771 * The function returns the number of words(u32) written
1772 * into @bin_buf.
1773 */
1774 int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
1775 {
1776 va_list args;
1777 int ret;
1778
1779 va_start(args, fmt);
1780 ret = vbin_printf(bin_buf, size, fmt, args);
1781 va_end(args);
1782
1783 return ret;
1784 }
1785 EXPORT_SYMBOL_GPL(bprintf);
1786
1787 #endif /* CONFIG_BINARY_PRINTF */
1788
1789 static noinline char *skip_space(const char *str)
1790 {
1791 while (isspace(*str))
1792 ++str;
1793 return (char *)str;
1794 }
1795
1796 /**
1797 * vsscanf - Unformat a buffer into a list of arguments
1798 * @buf: input buffer
1799 * @fmt: format of buffer
1800 * @args: arguments
1801 */
1802 int vsscanf(const char *buf, const char *fmt, va_list args)
1803 {
1804 const char *str = buf;
1805 char *next;
1806 char digit;
1807 int num = 0;
1808 int qualifier, base, field_width;
1809 bool is_sign;
1810
1811 while (*fmt && *str) {
1812 /* skip any white space in format */
1813 /* white space in format matchs any amount of
1814 * white space, including none, in the input.
1815 */
1816 if (isspace(*fmt)) {
1817 fmt = skip_space(fmt);
1818 str = skip_space(str);
1819 }
1820
1821 /* anything that is not a conversion must match exactly */
1822 if (*fmt != '%' && *fmt) {
1823 if (*fmt++ != *str++)
1824 break;
1825 continue;
1826 }
1827
1828 if (!*fmt)
1829 break;
1830 ++fmt;
1831
1832 /* skip this conversion.
1833 * advance both strings to next white space
1834 */
1835 if (*fmt == '*') {
1836 while (!isspace(*fmt) && *fmt != '%' && *fmt)
1837 fmt++;
1838 while (!isspace(*str) && *str)
1839 str++;
1840 continue;
1841 }
1842
1843 /* get field width */
1844 field_width = -1;
1845 if (isdigit(*fmt))
1846 field_width = skip_atoi(&fmt);
1847
1848 /* get conversion qualifier */
1849 qualifier = -1;
1850 if (*fmt == 'h' || TOLOWER(*fmt) == 'l' ||
1851 TOLOWER(*fmt) == 'z') {
1852 qualifier = *fmt++;
1853 if (unlikely(qualifier == *fmt)) {
1854 if (qualifier == 'h') {
1855 qualifier = 'H';
1856 fmt++;
1857 } else if (qualifier == 'l') {
1858 qualifier = 'L';
1859 fmt++;
1860 }
1861 }
1862 }
1863
1864 if (!*fmt || !*str)
1865 break;
1866
1867 base = 10;
1868 is_sign = 0;
1869
1870 switch (*fmt++) {
1871 case 'c':
1872 {
1873 char *s = (char *)va_arg(args, char*);
1874 if (field_width == -1)
1875 field_width = 1;
1876 do {
1877 *s++ = *str++;
1878 } while (--field_width > 0 && *str);
1879 num++;
1880 }
1881 continue;
1882 case 's':
1883 {
1884 char *s = (char *)va_arg(args, char *);
1885 if (field_width == -1)
1886 field_width = INT_MAX;
1887 /* first, skip leading white space in buffer */
1888 str = skip_space(str);
1889
1890 /* now copy until next white space */
1891 while (*str && !isspace(*str) && field_width--)
1892 *s++ = *str++;
1893 *s = '\0';
1894 num++;
1895 }
1896 continue;
1897 case 'n':
1898 /* return number of characters read so far */
1899 {
1900 int *i = (int *)va_arg(args, int*);
1901 *i = str - buf;
1902 }
1903 continue;
1904 case 'o':
1905 base = 8;
1906 break;
1907 case 'x':
1908 case 'X':
1909 base = 16;
1910 break;
1911 case 'i':
1912 base = 0;
1913 case 'd':
1914 is_sign = 1;
1915 case 'u':
1916 break;
1917 case '%':
1918 /* looking for '%' in str */
1919 if (*str++ != '%')
1920 return num;
1921 continue;
1922 default:
1923 /* invalid format; stop here */
1924 return num;
1925 }
1926
1927 /* have some sort of integer conversion.
1928 * first, skip white space in buffer.
1929 */
1930 str = skip_space(str);
1931
1932 digit = *str;
1933 if (is_sign && digit == '-')
1934 digit = *(str + 1);
1935
1936 if (!digit
1937 || (base == 16 && !isxdigit(digit))
1938 || (base == 10 && !isdigit(digit))
1939 || (base == 8 && (!isdigit(digit) || digit > '7'))
1940 || (base == 0 && !isdigit(digit)))
1941 break;
1942
1943 switch (qualifier) {
1944 case 'H': /* that's 'hh' in format */
1945 if (is_sign) {
1946 signed char *s = (signed char *)va_arg(args, signed char *);
1947 *s = (signed char)simple_strtol(str, &next, base);
1948 } else {
1949 unsigned char *s = (unsigned char *)va_arg(args, unsigned char *);
1950 *s = (unsigned char)simple_strtoul(str, &next, base);
1951 }
1952 break;
1953 case 'h':
1954 if (is_sign) {
1955 short *s = (short *)va_arg(args, short *);
1956 *s = (short)simple_strtol(str, &next, base);
1957 } else {
1958 unsigned short *s = (unsigned short *)va_arg(args, unsigned short *);
1959 *s = (unsigned short)simple_strtoul(str, &next, base);
1960 }
1961 break;
1962 case 'l':
1963 if (is_sign) {
1964 long *l = (long *)va_arg(args, long *);
1965 *l = simple_strtol(str, &next, base);
1966 } else {
1967 unsigned long *l = (unsigned long *)va_arg(args, unsigned long *);
1968 *l = simple_strtoul(str, &next, base);
1969 }
1970 break;
1971 case 'L':
1972 if (is_sign) {
1973 long long *l = (long long *)va_arg(args, long long *);
1974 *l = simple_strtoll(str, &next, base);
1975 } else {
1976 unsigned long long *l = (unsigned long long *)va_arg(args, unsigned long long *);
1977 *l = simple_strtoull(str, &next, base);
1978 }
1979 break;
1980 case 'Z':
1981 case 'z':
1982 {
1983 size_t *s = (size_t *)va_arg(args, size_t *);
1984 *s = (size_t)simple_strtoul(str, &next, base);
1985 }
1986 break;
1987 default:
1988 if (is_sign) {
1989 int *i = (int *)va_arg(args, int *);
1990 *i = (int)simple_strtol(str, &next, base);
1991 } else {
1992 unsigned int *i = (unsigned int *)va_arg(args, unsigned int*);
1993 *i = (unsigned int)simple_strtoul(str, &next, base);
1994 }
1995 break;
1996 }
1997 num++;
1998
1999 if (!next)
2000 break;
2001 str = next;
2002 }
2003
2004 /*
2005 * Now we've come all the way through so either the input string or the
2006 * format ended. In the former case, there can be a %n at the current
2007 * position in the format that needs to be filled.
2008 */
2009 if (*fmt == '%' && *(fmt + 1) == 'n') {
2010 int *p = (int *)va_arg(args, int *);
2011 *p = str - buf;
2012 }
2013
2014 return num;
2015 }
2016 EXPORT_SYMBOL(vsscanf);
2017
2018 /**
2019 * sscanf - Unformat a buffer into a list of arguments
2020 * @buf: input buffer
2021 * @fmt: formatting of buffer
2022 * @...: resulting arguments
2023 */
2024 int sscanf(const char *buf, const char *fmt, ...)
2025 {
2026 va_list args;
2027 int i;
2028
2029 va_start(args, fmt);
2030 i = vsscanf(buf, fmt, args);
2031 va_end(args);
2032
2033 return i;
2034 }
2035 EXPORT_SYMBOL(sscanf);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree