4 * Copyright (C) 1991, 1992 Linus Torvalds
7 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
9 * Wirzenius wrote this portably, Torvalds fucked it up :-)
14 * - changed to provide snprintf and vsnprintf functions
16 * - scnprintf and vscnprintf
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>
30 #include <asm/page.h> /* for PAGE_SIZE */
31 #include <asm/div64.h>
32 #include <asm/sections.h> /* for dereference_function_descriptor() */
34 /* Works only for digits and letters, but small and fast */
35 #define TOLOWER(x) ((x) | 0x20)
37 static unsigned int simple_guess_base(const char *cp)
40 if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2]))
50 * simple_strtoull - convert a string to an unsigned long 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
55 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
57 unsigned long long result = 0;
60 base = simple_guess_base(cp);
62 if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x')
65 while (isxdigit(*cp)) {
68 value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10;
71 result = result * base + value;
79 EXPORT_SYMBOL(simple_strtoull);
82 * simple_strtoul - convert a string to an unsigned 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
87 unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
89 return simple_strtoull(cp, endp, base);
91 EXPORT_SYMBOL(simple_strtoul);
94 * simple_strtol - convert a string to a signed long
95 * @cp: The start of the string
96 * @endp: A pointer to the end of the parsed string will be placed here
97 * @base: The number base to use
99 long simple_strtol(const char *cp, char **endp, unsigned int base)
102 return -simple_strtoul(cp + 1, endp, base);
104 return simple_strtoul(cp, endp, base);
106 EXPORT_SYMBOL(simple_strtol);
109 * simple_strtoll - convert a string to a signed long long
110 * @cp: The start of the string
111 * @endp: A pointer to the end of the parsed string will be placed here
112 * @base: The number base to use
114 long long simple_strtoll(const char *cp, char **endp, unsigned int base)
117 return -simple_strtoull(cp + 1, endp, base);
119 return simple_strtoull(cp, endp, base);
121 EXPORT_SYMBOL(simple_strtoll);
124 * strict_strtoul - convert a string to an unsigned long strictly
125 * @cp: The string to be converted
126 * @base: The number base to use
127 * @res: The converted result value
129 * strict_strtoul converts a string to an unsigned long only if the
130 * string is really an unsigned long string, any string containing
131 * any invalid char at the tail will be rejected and -EINVAL is returned,
132 * only a newline char at the tail is acceptible because people generally
133 * change a module parameter in the following way:
135 * echo 1024 > /sys/module/e1000/parameters/copybreak
137 * echo will append a newline to the tail.
139 * It returns 0 if conversion is successful and *res is set to the converted
140 * value, otherwise it returns -EINVAL and *res is set to 0.
142 * simple_strtoul just ignores the successive invalid characters and
143 * return the converted value of prefix part of the string.
145 int strict_strtoul(const char *cp, unsigned int base, unsigned long *res)
154 val = simple_strtoul(cp, &tail, base);
158 if ((tail[0] == '\0') || (tail[0] == '\n' && tail[1] == '\0')) {
165 EXPORT_SYMBOL(strict_strtoul);
168 * strict_strtol - convert a string to a long strictly
169 * @cp: The string to be converted
170 * @base: The number base to use
171 * @res: The converted result value
173 * strict_strtol is similiar to strict_strtoul, but it allows the first
174 * character of a string is '-'.
176 * It returns 0 if conversion is successful and *res is set to the converted
177 * value, otherwise it returns -EINVAL and *res is set to 0.
179 int strict_strtol(const char *cp, unsigned int base, long *res)
183 ret = strict_strtoul(cp + 1, base, (unsigned long *)res);
187 ret = strict_strtoul(cp, base, (unsigned long *)res);
192 EXPORT_SYMBOL(strict_strtol);
195 * strict_strtoull - convert a string to an unsigned long long strictly
196 * @cp: The string to be converted
197 * @base: The number base to use
198 * @res: The converted result value
200 * strict_strtoull converts a string to an unsigned long long only if the
201 * string is really an unsigned long long string, any string containing
202 * any invalid char at the tail will be rejected and -EINVAL is returned,
203 * only a newline char at the tail is acceptible because people generally
204 * change a module parameter in the following way:
206 * echo 1024 > /sys/module/e1000/parameters/copybreak
208 * echo will append a newline to the tail of the string.
210 * It returns 0 if conversion is successful and *res is set to the converted
211 * value, otherwise it returns -EINVAL and *res is set to 0.
213 * simple_strtoull just ignores the successive invalid characters and
214 * return the converted value of prefix part of the string.
216 int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res)
219 unsigned long long val;
225 val = simple_strtoull(cp, &tail, base);
228 if ((tail[0] == '\0') || (tail[0] == '\n' && tail[1] == '\0')) {
235 EXPORT_SYMBOL(strict_strtoull);
238 * strict_strtoll - convert a string to a long long strictly
239 * @cp: The string to be converted
240 * @base: The number base to use
241 * @res: The converted result value
243 * strict_strtoll is similiar to strict_strtoull, but it allows the first
244 * character of a string is '-'.
246 * It returns 0 if conversion is successful and *res is set to the converted
247 * value, otherwise it returns -EINVAL and *res is set to 0.
249 int strict_strtoll(const char *cp, unsigned int base, long long *res)
253 ret = strict_strtoull(cp + 1, base, (unsigned long long *)res);
257 ret = strict_strtoull(cp, base, (unsigned long long *)res);
262 EXPORT_SYMBOL(strict_strtoll);
264 static noinline_for_stack
265 int skip_atoi(const char **s)
270 i = i*10 + *((*s)++) - '0';
275 /* Decimal conversion is by far the most typical, and is used
276 * for /proc and /sys data. This directly impacts e.g. top performance
277 * with many processes running. We optimize it for speed
279 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
280 * (with permission from the author, Douglas W. Jones). */
282 /* Formats correctly any integer in [0,99999].
283 * Outputs from one to five digits depending on input.
284 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
285 static noinline_for_stack
286 char *put_dec_trunc(char *buf, unsigned q)
288 unsigned d3, d2, d1, d0;
293 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
294 q = (d0 * 0xcd) >> 11;
296 *buf++ = d0 + '0'; /* least significant digit */
297 d1 = q + 9*d3 + 5*d2 + d1;
299 q = (d1 * 0xcd) >> 11;
301 *buf++ = d1 + '0'; /* next digit */
304 if ((d2 != 0) || (d3 != 0)) {
307 *buf++ = d2 + '0'; /* next digit */
311 q = (d3 * 0xcd) >> 11;
313 *buf++ = d3 + '0'; /* next digit */
315 *buf++ = q + '0'; /* most sign. digit */
322 /* Same with if's removed. Always emits five digits */
323 static noinline_for_stack
324 char *put_dec_full(char *buf, unsigned q)
326 /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
327 /* but anyway, gcc produces better code with full-sized ints */
328 unsigned d3, d2, d1, d0;
334 * Possible ways to approx. divide by 10
335 * gcc -O2 replaces multiply with shifts and adds
336 * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
337 * (x * 0x67) >> 10: 1100111
338 * (x * 0x34) >> 9: 110100 - same
339 * (x * 0x1a) >> 8: 11010 - same
340 * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
342 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
343 q = (d0 * 0xcd) >> 11;
346 d1 = q + 9*d3 + 5*d2 + d1;
347 q = (d1 * 0xcd) >> 11;
357 q = (d3 * 0xcd) >> 11; /* - shorter code */
358 /* q = (d3 * 0x67) >> 10; - would also work */
365 /* No inlining helps gcc to use registers better */
366 static noinline_for_stack
367 char *put_dec(char *buf, unsigned long long num)
372 return put_dec_trunc(buf, num);
373 rem = do_div(num, 100000);
374 buf = put_dec_full(buf, rem);
378 #define ZEROPAD 1 /* pad with zero */
379 #define SIGN 2 /* unsigned/signed long */
380 #define PLUS 4 /* show plus */
381 #define SPACE 8 /* space if plus */
382 #define LEFT 16 /* left justified */
383 #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
384 #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
387 FORMAT_TYPE_NONE, /* Just a string part */
389 FORMAT_TYPE_PRECISION,
393 FORMAT_TYPE_PERCENT_CHAR,
395 FORMAT_TYPE_LONG_LONG,
410 u8 type; /* format_type enum */
411 u8 flags; /* flags to number() */
412 u8 base; /* number base, 8, 10 or 16 only */
413 u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */
414 s16 field_width; /* width of output field */
415 s16 precision; /* # of digits/chars */
418 static noinline_for_stack
419 char *number(char *buf, char *end, unsigned long long num,
420 struct printf_spec spec)
422 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
423 static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
428 int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
431 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
432 * produces same digits or (maybe lowercased) letters */
433 locase = (spec.flags & SMALL);
434 if (spec.flags & LEFT)
435 spec.flags &= ~ZEROPAD;
437 if (spec.flags & SIGN) {
438 if ((signed long long)num < 0) {
440 num = -(signed long long)num;
442 } else if (spec.flags & PLUS) {
445 } else if (spec.flags & SPACE) {
456 /* generate full string in tmp[], in reverse order */
460 /* Generic code, for any base:
462 tmp[i++] = (digits[do_div(num,base)] | locase);
465 else if (spec.base != 10) { /* 8 or 16 */
466 int mask = spec.base - 1;
472 tmp[i++] = (digits[((unsigned char)num) & mask] | locase);
475 } else { /* base 10 */
476 i = put_dec(tmp, num) - tmp;
479 /* printing 100 using %2d gives "100", not "00" */
480 if (i > spec.precision)
482 /* leading space padding */
483 spec.field_width -= spec.precision;
484 if (!(spec.flags & (ZEROPAD+LEFT))) {
485 while (--spec.field_width >= 0) {
497 /* "0x" / "0" prefix */
502 if (spec.base == 16) {
504 *buf = ('X' | locase);
508 /* zero or space padding */
509 if (!(spec.flags & LEFT)) {
510 char c = (spec.flags & ZEROPAD) ? '0' : ' ';
511 while (--spec.field_width >= 0) {
517 /* hmm even more zero padding? */
518 while (i <= --spec.precision) {
523 /* actual digits of result */
529 /* trailing space padding */
530 while (--spec.field_width >= 0) {
539 static noinline_for_stack
540 char *string(char *buf, char *end, const char *s, struct printf_spec spec)
544 if ((unsigned long)s < PAGE_SIZE)
547 len = strnlen(s, spec.precision);
549 if (!(spec.flags & LEFT)) {
550 while (len < spec.field_width--) {
556 for (i = 0; i < len; ++i) {
561 while (len < spec.field_width--) {
570 static noinline_for_stack
571 char *symbol_string(char *buf, char *end, void *ptr,
572 struct printf_spec spec, char ext)
574 unsigned long value = (unsigned long) ptr;
575 #ifdef CONFIG_KALLSYMS
576 char sym[KSYM_SYMBOL_LEN];
578 sprint_backtrace(sym, value);
579 else if (ext != 'f' && ext != 's')
580 sprint_symbol(sym, value);
582 kallsyms_lookup(value, NULL, NULL, NULL, sym);
584 return string(buf, end, sym, spec);
586 spec.field_width = 2 * sizeof(void *);
587 spec.flags |= SPECIAL | SMALL | ZEROPAD;
590 return number(buf, end, value, spec);
594 static noinline_for_stack
595 char *resource_string(char *buf, char *end, struct resource *res,
596 struct printf_spec spec, const char *fmt)
598 #ifndef IO_RSRC_PRINTK_SIZE
599 #define IO_RSRC_PRINTK_SIZE 6
602 #ifndef MEM_RSRC_PRINTK_SIZE
603 #define MEM_RSRC_PRINTK_SIZE 10
605 static const struct printf_spec io_spec = {
607 .field_width = IO_RSRC_PRINTK_SIZE,
609 .flags = SPECIAL | SMALL | ZEROPAD,
611 static const struct printf_spec mem_spec = {
613 .field_width = MEM_RSRC_PRINTK_SIZE,
615 .flags = SPECIAL | SMALL | ZEROPAD,
617 static const struct printf_spec bus_spec = {
621 .flags = SMALL | ZEROPAD,
623 static const struct printf_spec dec_spec = {
628 static const struct printf_spec str_spec = {
633 static const struct printf_spec flag_spec = {
636 .flags = SPECIAL | SMALL,
639 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
640 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
641 #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
642 #define FLAG_BUF_SIZE (2 * sizeof(res->flags))
643 #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
644 #define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
645 char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
646 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
648 char *p = sym, *pend = sym + sizeof(sym);
649 int decode = (fmt[0] == 'R') ? 1 : 0;
650 const struct printf_spec *specp;
653 if (res->flags & IORESOURCE_IO) {
654 p = string(p, pend, "io ", str_spec);
656 } else if (res->flags & IORESOURCE_MEM) {
657 p = string(p, pend, "mem ", str_spec);
659 } else if (res->flags & IORESOURCE_IRQ) {
660 p = string(p, pend, "irq ", str_spec);
662 } else if (res->flags & IORESOURCE_DMA) {
663 p = string(p, pend, "dma ", str_spec);
665 } else if (res->flags & IORESOURCE_BUS) {
666 p = string(p, pend, "bus ", str_spec);
669 p = string(p, pend, "??? ", str_spec);
673 p = number(p, pend, res->start, *specp);
674 if (res->start != res->end) {
676 p = number(p, pend, res->end, *specp);
679 if (res->flags & IORESOURCE_MEM_64)
680 p = string(p, pend, " 64bit", str_spec);
681 if (res->flags & IORESOURCE_PREFETCH)
682 p = string(p, pend, " pref", str_spec);
683 if (res->flags & IORESOURCE_WINDOW)
684 p = string(p, pend, " window", str_spec);
685 if (res->flags & IORESOURCE_DISABLED)
686 p = string(p, pend, " disabled", str_spec);
688 p = string(p, pend, " flags ", str_spec);
689 p = number(p, pend, res->flags, flag_spec);
694 return string(buf, end, sym, spec);
697 static noinline_for_stack
698 char *mac_address_string(char *buf, char *end, u8 *addr,
699 struct printf_spec spec, const char *fmt)
701 char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
706 if (fmt[1] == 'F') { /* FDDI canonical format */
712 for (i = 0; i < 6; i++) {
713 p = pack_hex_byte(p, addr[i]);
714 if (fmt[0] == 'M' && i != 5)
719 return string(buf, end, mac_addr, spec);
722 static noinline_for_stack
723 char *ip4_string(char *p, const u8 *addr, const char *fmt)
726 bool leading_zeros = (fmt[0] == 'i');
751 for (i = 0; i < 4; i++) {
752 char temp[3]; /* hold each IP quad in reverse order */
753 int digits = put_dec_trunc(temp, addr[index]) - temp;
760 /* reverse the digits in the quad */
772 static noinline_for_stack
773 char *ip6_compressed_string(char *p, const char *addr)
776 unsigned char zerolength[8];
781 bool needcolon = false;
785 memcpy(&in6, addr, sizeof(struct in6_addr));
787 useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
789 memset(zerolength, 0, sizeof(zerolength));
796 /* find position of longest 0 run */
797 for (i = 0; i < range; i++) {
798 for (j = i; j < range; j++) {
799 if (in6.s6_addr16[j] != 0)
804 for (i = 0; i < range; i++) {
805 if (zerolength[i] > longest) {
806 longest = zerolength[i];
812 for (i = 0; i < range; i++) {
814 if (needcolon || i == 0)
825 /* hex u16 without leading 0s */
826 word = ntohs(in6.s6_addr16[i]);
831 p = pack_hex_byte(p, hi);
833 *p++ = hex_asc_lo(hi);
834 p = pack_hex_byte(p, lo);
837 p = pack_hex_byte(p, lo);
839 *p++ = hex_asc_lo(lo);
846 p = ip4_string(p, &in6.s6_addr[12], "I4");
853 static noinline_for_stack
854 char *ip6_string(char *p, const char *addr, const char *fmt)
858 for (i = 0; i < 8; i++) {
859 p = pack_hex_byte(p, *addr++);
860 p = pack_hex_byte(p, *addr++);
861 if (fmt[0] == 'I' && i != 7)
869 static noinline_for_stack
870 char *ip6_addr_string(char *buf, char *end, const u8 *addr,
871 struct printf_spec spec, const char *fmt)
873 char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
875 if (fmt[0] == 'I' && fmt[2] == 'c')
876 ip6_compressed_string(ip6_addr, addr);
878 ip6_string(ip6_addr, addr, fmt);
880 return string(buf, end, ip6_addr, spec);
883 static noinline_for_stack
884 char *ip4_addr_string(char *buf, char *end, const u8 *addr,
885 struct printf_spec spec, const char *fmt)
887 char ip4_addr[sizeof("255.255.255.255")];
889 ip4_string(ip4_addr, addr, fmt);
891 return string(buf, end, ip4_addr, spec);
894 static noinline_for_stack
895 char *uuid_string(char *buf, char *end, const u8 *addr,
896 struct printf_spec spec, const char *fmt)
898 char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")];
901 static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
902 static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15};
903 const u8 *index = be;
908 uc = true; /* fall-through */
917 for (i = 0; i < 16; i++) {
918 p = pack_hex_byte(p, addr[index[i]]);
938 return string(buf, end, uuid, spec);
941 int kptr_restrict = 1;
944 * Show a '%p' thing. A kernel extension is that the '%p' is followed
945 * by an extra set of alphanumeric characters that are extended format
948 * Right now we handle:
950 * - 'F' For symbolic function descriptor pointers with offset
951 * - 'f' For simple symbolic function names without offset
952 * - 'S' For symbolic direct pointers with offset
953 * - 's' For symbolic direct pointers without offset
954 * - 'B' For backtraced symbolic direct pointers with offset
955 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
956 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
957 * - 'M' For a 6-byte MAC address, it prints the address in the
958 * usual colon-separated hex notation
959 * - 'm' For a 6-byte MAC address, it prints the hex address without colons
960 * - 'MF' For a 6-byte MAC FDDI address, it prints the address
961 * with a dash-separated hex notation
962 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
963 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
964 * IPv6 uses colon separated network-order 16 bit hex with leading 0's
965 * - 'i' [46] for 'raw' IPv4/IPv6 addresses
966 * IPv6 omits the colons (01020304...0f)
967 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
968 * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order
969 * - 'I6c' for IPv6 addresses printed as specified by
970 * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00
971 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
972 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
973 * Options for %pU are:
974 * b big endian lower case hex (default)
975 * B big endian UPPER case hex
976 * l little endian lower case hex
977 * L little endian UPPER case hex
978 * big endian output byte order is:
979 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
980 * little endian output byte order is:
981 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
982 * - 'V' For a struct va_format which contains a format string * and va_list *,
983 * call vsnprintf(->format, *->va_list).
984 * Implements a "recursive vsnprintf".
985 * Do not use this feature without some mechanism to verify the
986 * correctness of the format string and va_list arguments.
987 * - 'K' For a kernel pointer that should be hidden from unprivileged users
989 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
990 * function pointers are really function descriptors, which contain a
991 * pointer to the real address.
993 static noinline_for_stack
994 char *pointer(const char *fmt, char *buf, char *end, void *ptr,
995 struct printf_spec spec)
999 * Print (null) with the same width as a pointer so it makes
1000 * tabular output look nice.
1002 if (spec.field_width == -1)
1003 spec.field_width = 2 * sizeof(void *);
1004 return string(buf, end, "(null)", spec);
1010 ptr = dereference_function_descriptor(ptr);
1015 return symbol_string(buf, end, ptr, spec, *fmt);
1018 return resource_string(buf, end, ptr, spec, fmt);
1019 case 'M': /* Colon separated: 00:01:02:03:04:05 */
1020 case 'm': /* Contiguous: 000102030405 */
1021 /* [mM]F (FDDI, bit reversed) */
1022 return mac_address_string(buf, end, ptr, spec, fmt);
1023 case 'I': /* Formatted IP supported
1025 * 6: 0001:0203:...:0708
1026 * 6c: 1::708 or 1::1.2.3.4
1028 case 'i': /* Contiguous:
1029 * 4: 001.002.003.004
1034 return ip6_addr_string(buf, end, ptr, spec, fmt);
1036 return ip4_addr_string(buf, end, ptr, spec, fmt);
1040 return uuid_string(buf, end, ptr, spec, fmt);
1042 return buf + vsnprintf(buf, end - buf,
1043 ((struct va_format *)ptr)->fmt,
1044 *(((struct va_format *)ptr)->va));
1047 * %pK cannot be used in IRQ context because its test
1048 * for CAP_SYSLOG would be meaningless.
1050 if (in_irq() || in_serving_softirq() || in_nmi()) {
1051 if (spec.field_width == -1)
1052 spec.field_width = 2 * sizeof(void *);
1053 return string(buf, end, "pK-error", spec);
1054 } else if ((kptr_restrict == 0) ||
1055 (kptr_restrict == 1 &&
1056 has_capability_noaudit(current, CAP_SYSLOG)))
1059 if (spec.field_width == -1) {
1060 spec.field_width = 2 * sizeof(void *);
1061 spec.flags |= ZEROPAD;
1063 return number(buf, end, 0, spec);
1065 spec.flags |= SMALL;
1066 if (spec.field_width == -1) {
1067 spec.field_width = 2 * sizeof(void *);
1068 spec.flags |= ZEROPAD;
1072 return number(buf, end, (unsigned long) ptr, spec);
1076 * Helper function to decode printf style format.
1077 * Each call decode a token from the format and return the
1078 * number of characters read (or likely the delta where it wants
1079 * to go on the next call).
1080 * The decoded token is returned through the parameters
1082 * 'h', 'l', or 'L' for integer fields
1083 * 'z' support added 23/7/1999 S.H.
1084 * 'z' changed to 'Z' --davidm 1/25/99
1085 * 't' added for ptrdiff_t
1087 * @fmt: the format string
1088 * @type of the token returned
1089 * @flags: various flags such as +, -, # tokens..
1090 * @field_width: overwritten width
1091 * @base: base of the number (octal, hex, ...)
1092 * @precision: precision of a number
1093 * @qualifier: qualifier of a number (long, size_t, ...)
1095 static noinline_for_stack
1096 int format_decode(const char *fmt, struct printf_spec *spec)
1098 const char *start = fmt;
1100 /* we finished early by reading the field width */
1101 if (spec->type == FORMAT_TYPE_WIDTH) {
1102 if (spec->field_width < 0) {
1103 spec->field_width = -spec->field_width;
1104 spec->flags |= LEFT;
1106 spec->type = FORMAT_TYPE_NONE;
1110 /* we finished early by reading the precision */
1111 if (spec->type == FORMAT_TYPE_PRECISION) {
1112 if (spec->precision < 0)
1113 spec->precision = 0;
1115 spec->type = FORMAT_TYPE_NONE;
1120 spec->type = FORMAT_TYPE_NONE;
1122 for (; *fmt ; ++fmt) {
1127 /* Return the current non-format string */
1128 if (fmt != start || !*fmt)
1134 while (1) { /* this also skips first '%' */
1140 case '-': spec->flags |= LEFT; break;
1141 case '+': spec->flags |= PLUS; break;
1142 case ' ': spec->flags |= SPACE; break;
1143 case '#': spec->flags |= SPECIAL; break;
1144 case '0': spec->flags |= ZEROPAD; break;
1145 default: found = false;
1152 /* get field width */
1153 spec->field_width = -1;
1156 spec->field_width = skip_atoi(&fmt);
1157 else if (*fmt == '*') {
1158 /* it's the next argument */
1159 spec->type = FORMAT_TYPE_WIDTH;
1160 return ++fmt - start;
1164 /* get the precision */
1165 spec->precision = -1;
1168 if (isdigit(*fmt)) {
1169 spec->precision = skip_atoi(&fmt);
1170 if (spec->precision < 0)
1171 spec->precision = 0;
1172 } else if (*fmt == '*') {
1173 /* it's the next argument */
1174 spec->type = FORMAT_TYPE_PRECISION;
1175 return ++fmt - start;
1180 /* get the conversion qualifier */
1181 spec->qualifier = -1;
1182 if (*fmt == 'h' || TOLOWER(*fmt) == 'l' ||
1183 TOLOWER(*fmt) == 'z' || *fmt == 't') {
1184 spec->qualifier = *fmt++;
1185 if (unlikely(spec->qualifier == *fmt)) {
1186 if (spec->qualifier == 'l') {
1187 spec->qualifier = 'L';
1189 } else if (spec->qualifier == 'h') {
1190 spec->qualifier = 'H';
1200 spec->type = FORMAT_TYPE_CHAR;
1201 return ++fmt - start;
1204 spec->type = FORMAT_TYPE_STR;
1205 return ++fmt - start;
1208 spec->type = FORMAT_TYPE_PTR;
1213 spec->type = FORMAT_TYPE_NRCHARS;
1214 return ++fmt - start;
1217 spec->type = FORMAT_TYPE_PERCENT_CHAR;
1218 return ++fmt - start;
1220 /* integer number formats - set up the flags and "break" */
1226 spec->flags |= SMALL;
1234 spec->flags |= SIGN;
1239 spec->type = FORMAT_TYPE_INVALID;
1243 if (spec->qualifier == 'L')
1244 spec->type = FORMAT_TYPE_LONG_LONG;
1245 else if (spec->qualifier == 'l') {
1246 if (spec->flags & SIGN)
1247 spec->type = FORMAT_TYPE_LONG;
1249 spec->type = FORMAT_TYPE_ULONG;
1250 } else if (TOLOWER(spec->qualifier) == 'z') {
1251 spec->type = FORMAT_TYPE_SIZE_T;
1252 } else if (spec->qualifier == 't') {
1253 spec->type = FORMAT_TYPE_PTRDIFF;
1254 } else if (spec->qualifier == 'H') {
1255 if (spec->flags & SIGN)
1256 spec->type = FORMAT_TYPE_BYTE;
1258 spec->type = FORMAT_TYPE_UBYTE;
1259 } else if (spec->qualifier == 'h') {
1260 if (spec->flags & SIGN)
1261 spec->type = FORMAT_TYPE_SHORT;
1263 spec->type = FORMAT_TYPE_USHORT;
1265 if (spec->flags & SIGN)
1266 spec->type = FORMAT_TYPE_INT;
1268 spec->type = FORMAT_TYPE_UINT;
1271 return ++fmt - start;
1275 * vsnprintf - Format a string and place it in a buffer
1276 * @buf: The buffer to place the result into
1277 * @size: The size of the buffer, including the trailing null space
1278 * @fmt: The format string to use
1279 * @args: Arguments for the format string
1281 * This function follows C99 vsnprintf, but has some extensions:
1282 * %pS output the name of a text symbol with offset
1283 * %ps output the name of a text symbol without offset
1284 * %pF output the name of a function pointer with its offset
1285 * %pf output the name of a function pointer without its offset
1286 * %pB output the name of a backtrace symbol with its offset
1287 * %pR output the address range in a struct resource with decoded flags
1288 * %pr output the address range in a struct resource with raw flags
1289 * %pM output a 6-byte MAC address with colons
1290 * %pm output a 6-byte MAC address without colons
1291 * %pI4 print an IPv4 address without leading zeros
1292 * %pi4 print an IPv4 address with leading zeros
1293 * %pI6 print an IPv6 address with colons
1294 * %pi6 print an IPv6 address without colons
1295 * %pI6c print an IPv6 address as specified by
1296 * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00
1297 * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
1301 * The return value is the number of characters which would
1302 * be generated for the given input, excluding the trailing
1303 * '\0', as per ISO C99. If you want to have the exact
1304 * number of characters written into @buf as return value
1305 * (not including the trailing '\0'), use vscnprintf(). If the
1306 * return is greater than or equal to @size, the resulting
1307 * string is truncated.
1309 * Call this function if you are already dealing with a va_list.
1310 * You probably want snprintf() instead.
1312 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
1314 unsigned long long num;
1316 struct printf_spec spec = {0};
1318 /* Reject out-of-range values early. Large positive sizes are
1319 used for unknown buffer sizes. */
1320 if (WARN_ON_ONCE((int) size < 0))
1326 /* Make sure end is always >= buf */
1333 const char *old_fmt = fmt;
1334 int read = format_decode(fmt, &spec);
1338 switch (spec.type) {
1339 case FORMAT_TYPE_NONE: {
1342 if (copy > end - str)
1344 memcpy(str, old_fmt, copy);
1350 case FORMAT_TYPE_WIDTH:
1351 spec.field_width = va_arg(args, int);
1354 case FORMAT_TYPE_PRECISION:
1355 spec.precision = va_arg(args, int);
1358 case FORMAT_TYPE_CHAR: {
1361 if (!(spec.flags & LEFT)) {
1362 while (--spec.field_width > 0) {
1369 c = (unsigned char) va_arg(args, int);
1373 while (--spec.field_width > 0) {
1381 case FORMAT_TYPE_STR:
1382 str = string(str, end, va_arg(args, char *), spec);
1385 case FORMAT_TYPE_PTR:
1386 str = pointer(fmt+1, str, end, va_arg(args, void *),
1388 while (isalnum(*fmt))
1392 case FORMAT_TYPE_PERCENT_CHAR:
1398 case FORMAT_TYPE_INVALID:
1404 case FORMAT_TYPE_NRCHARS: {
1405 u8 qualifier = spec.qualifier;
1407 if (qualifier == 'l') {
1408 long *ip = va_arg(args, long *);
1410 } else if (TOLOWER(qualifier) == 'z') {
1411 size_t *ip = va_arg(args, size_t *);
1414 int *ip = va_arg(args, int *);
1421 switch (spec.type) {
1422 case FORMAT_TYPE_LONG_LONG:
1423 num = va_arg(args, long long);
1425 case FORMAT_TYPE_ULONG:
1426 num = va_arg(args, unsigned long);
1428 case FORMAT_TYPE_LONG:
1429 num = va_arg(args, long);
1431 case FORMAT_TYPE_SIZE_T:
1432 num = va_arg(args, size_t);
1434 case FORMAT_TYPE_PTRDIFF:
1435 num = va_arg(args, ptrdiff_t);
1437 case FORMAT_TYPE_UBYTE:
1438 num = (unsigned char) va_arg(args, int);
1440 case FORMAT_TYPE_BYTE:
1441 num = (signed char) va_arg(args, int);
1443 case FORMAT_TYPE_USHORT:
1444 num = (unsigned short) va_arg(args, int);
1446 case FORMAT_TYPE_SHORT:
1447 num = (short) va_arg(args, int);
1449 case FORMAT_TYPE_INT:
1450 num = (int) va_arg(args, int);
1453 num = va_arg(args, unsigned int);
1456 str = number(str, end, num, spec);
1467 /* the trailing null byte doesn't count towards the total */
1471 EXPORT_SYMBOL(vsnprintf);
1474 * vscnprintf - Format a string and place it in a buffer
1475 * @buf: The buffer to place the result into
1476 * @size: The size of the buffer, including the trailing null space
1477 * @fmt: The format string to use
1478 * @args: Arguments for the format string
1480 * The return value is the number of characters which have been written into
1481 * the @buf not including the trailing '\0'. If @size is == 0 the function
1484 * Call this function if you are already dealing with a va_list.
1485 * You probably want scnprintf() instead.
1487 * See the vsnprintf() documentation for format string extensions over C99.
1489 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
1493 i = vsnprintf(buf, size, fmt, args);
1495 if (likely(i < size))
1501 EXPORT_SYMBOL(vscnprintf);
1504 * snprintf - Format a string and place it in a buffer
1505 * @buf: The buffer to place the result into
1506 * @size: The size of the buffer, including the trailing null space
1507 * @fmt: The format string to use
1508 * @...: Arguments for the format string
1510 * The return value is the number of characters which would be
1511 * generated for the given input, excluding the trailing null,
1512 * as per ISO C99. If the return is greater than or equal to
1513 * @size, the resulting string is truncated.
1515 * See the vsnprintf() documentation for format string extensions over C99.
1517 int snprintf(char *buf, size_t size, const char *fmt, ...)
1522 va_start(args, fmt);
1523 i = vsnprintf(buf, size, fmt, args);
1528 EXPORT_SYMBOL(snprintf);
1531 * scnprintf - Format a string and place it in a buffer
1532 * @buf: The buffer to place the result into
1533 * @size: The size of the buffer, including the trailing null space
1534 * @fmt: The format string to use
1535 * @...: Arguments for the format string
1537 * The return value is the number of characters written into @buf not including
1538 * the trailing '\0'. If @size is == 0 the function returns 0.
1541 int scnprintf(char *buf, size_t size, const char *fmt, ...)
1546 va_start(args, fmt);
1547 i = vscnprintf(buf, size, fmt, args);
1552 EXPORT_SYMBOL(scnprintf);
1555 * vsprintf - Format a string and place it in a buffer
1556 * @buf: The buffer to place the result into
1557 * @fmt: The format string to use
1558 * @args: Arguments for the format string
1560 * The function returns the number of characters written
1561 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
1564 * Call this function if you are already dealing with a va_list.
1565 * You probably want sprintf() instead.
1567 * See the vsnprintf() documentation for format string extensions over C99.
1569 int vsprintf(char *buf, const char *fmt, va_list args)
1571 return vsnprintf(buf, INT_MAX, fmt, args);
1573 EXPORT_SYMBOL(vsprintf);
1576 * sprintf - Format a string and place it in a buffer
1577 * @buf: The buffer to place the result into
1578 * @fmt: The format string to use
1579 * @...: Arguments for the format string
1581 * The function returns the number of characters written
1582 * into @buf. Use snprintf() or scnprintf() in order to avoid
1585 * See the vsnprintf() documentation for format string extensions over C99.
1587 int sprintf(char *buf, const char *fmt, ...)
1592 va_start(args, fmt);
1593 i = vsnprintf(buf, INT_MAX, fmt, args);
1598 EXPORT_SYMBOL(sprintf);
1600 #ifdef CONFIG_BINARY_PRINTF
1603 * vbin_printf() - VA arguments to binary data
1604 * bstr_printf() - Binary data to text string
1608 * vbin_printf - Parse a format string and place args' binary value in a buffer
1609 * @bin_buf: The buffer to place args' binary value
1610 * @size: The size of the buffer(by words(32bits), not characters)
1611 * @fmt: The format string to use
1612 * @args: Arguments for the format string
1614 * The format follows C99 vsnprintf, except %n is ignored, and its argument
1617 * The return value is the number of words(32bits) which would be generated for
1621 * If the return value is greater than @size, the resulting bin_buf is NOT
1622 * valid for bstr_printf().
1624 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
1626 struct printf_spec spec = {0};
1629 str = (char *)bin_buf;
1630 end = (char *)(bin_buf + size);
1632 #define save_arg(type) \
1634 if (sizeof(type) == 8) { \
1635 unsigned long long value; \
1636 str = PTR_ALIGN(str, sizeof(u32)); \
1637 value = va_arg(args, unsigned long long); \
1638 if (str + sizeof(type) <= end) { \
1639 *(u32 *)str = *(u32 *)&value; \
1640 *(u32 *)(str + 4) = *((u32 *)&value + 1); \
1643 unsigned long value; \
1644 str = PTR_ALIGN(str, sizeof(type)); \
1645 value = va_arg(args, int); \
1646 if (str + sizeof(type) <= end) \
1647 *(typeof(type) *)str = (type)value; \
1649 str += sizeof(type); \
1653 int read = format_decode(fmt, &spec);
1657 switch (spec.type) {
1658 case FORMAT_TYPE_NONE:
1659 case FORMAT_TYPE_INVALID:
1660 case FORMAT_TYPE_PERCENT_CHAR:
1663 case FORMAT_TYPE_WIDTH:
1664 case FORMAT_TYPE_PRECISION:
1668 case FORMAT_TYPE_CHAR:
1672 case FORMAT_TYPE_STR: {
1673 const char *save_str = va_arg(args, char *);
1676 if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
1677 || (unsigned long)save_str < PAGE_SIZE)
1678 save_str = "(null)";
1679 len = strlen(save_str) + 1;
1680 if (str + len < end)
1681 memcpy(str, save_str, len);
1686 case FORMAT_TYPE_PTR:
1688 /* skip all alphanumeric pointer suffixes */
1689 while (isalnum(*fmt))
1693 case FORMAT_TYPE_NRCHARS: {
1694 /* skip %n 's argument */
1695 u8 qualifier = spec.qualifier;
1697 if (qualifier == 'l')
1698 skip_arg = va_arg(args, long *);
1699 else if (TOLOWER(qualifier) == 'z')
1700 skip_arg = va_arg(args, size_t *);
1702 skip_arg = va_arg(args, int *);
1707 switch (spec.type) {
1709 case FORMAT_TYPE_LONG_LONG:
1710 save_arg(long long);
1712 case FORMAT_TYPE_ULONG:
1713 case FORMAT_TYPE_LONG:
1714 save_arg(unsigned long);
1716 case FORMAT_TYPE_SIZE_T:
1719 case FORMAT_TYPE_PTRDIFF:
1720 save_arg(ptrdiff_t);
1722 case FORMAT_TYPE_UBYTE:
1723 case FORMAT_TYPE_BYTE:
1726 case FORMAT_TYPE_USHORT:
1727 case FORMAT_TYPE_SHORT:
1736 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
1739 EXPORT_SYMBOL_GPL(vbin_printf);
1742 * bstr_printf - Format a string from binary arguments and place it in a buffer
1743 * @buf: The buffer to place the result into
1744 * @size: The size of the buffer, including the trailing null space
1745 * @fmt: The format string to use
1746 * @bin_buf: Binary arguments for the format string
1748 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
1749 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
1750 * a binary buffer that generated by vbin_printf.
1752 * The format follows C99 vsnprintf, but has some extensions:
1753 * see vsnprintf comment for details.
1755 * The return value is the number of characters which would
1756 * be generated for the given input, excluding the trailing
1757 * '\0', as per ISO C99. If you want to have the exact
1758 * number of characters written into @buf as return value
1759 * (not including the trailing '\0'), use vscnprintf(). If the
1760 * return is greater than or equal to @size, the resulting
1761 * string is truncated.
1763 int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
1765 struct printf_spec spec = {0};
1767 const char *args = (const char *)bin_buf;
1769 if (WARN_ON_ONCE((int) size < 0))
1775 #define get_arg(type) \
1777 typeof(type) value; \
1778 if (sizeof(type) == 8) { \
1779 args = PTR_ALIGN(args, sizeof(u32)); \
1780 *(u32 *)&value = *(u32 *)args; \
1781 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
1783 args = PTR_ALIGN(args, sizeof(type)); \
1784 value = *(typeof(type) *)args; \
1786 args += sizeof(type); \
1790 /* Make sure end is always >= buf */
1797 const char *old_fmt = fmt;
1798 int read = format_decode(fmt, &spec);
1802 switch (spec.type) {
1803 case FORMAT_TYPE_NONE: {
1806 if (copy > end - str)
1808 memcpy(str, old_fmt, copy);
1814 case FORMAT_TYPE_WIDTH:
1815 spec.field_width = get_arg(int);
1818 case FORMAT_TYPE_PRECISION:
1819 spec.precision = get_arg(int);
1822 case FORMAT_TYPE_CHAR: {
1825 if (!(spec.flags & LEFT)) {
1826 while (--spec.field_width > 0) {
1832 c = (unsigned char) get_arg(char);
1836 while (--spec.field_width > 0) {
1844 case FORMAT_TYPE_STR: {
1845 const char *str_arg = args;
1846 args += strlen(str_arg) + 1;
1847 str = string(str, end, (char *)str_arg, spec);
1851 case FORMAT_TYPE_PTR:
1852 str = pointer(fmt+1, str, end, get_arg(void *), spec);
1853 while (isalnum(*fmt))
1857 case FORMAT_TYPE_PERCENT_CHAR:
1858 case FORMAT_TYPE_INVALID:
1864 case FORMAT_TYPE_NRCHARS:
1869 unsigned long long num;
1871 switch (spec.type) {
1873 case FORMAT_TYPE_LONG_LONG:
1874 num = get_arg(long long);
1876 case FORMAT_TYPE_ULONG:
1877 case FORMAT_TYPE_LONG:
1878 num = get_arg(unsigned long);
1880 case FORMAT_TYPE_SIZE_T:
1881 num = get_arg(size_t);
1883 case FORMAT_TYPE_PTRDIFF:
1884 num = get_arg(ptrdiff_t);
1886 case FORMAT_TYPE_UBYTE:
1887 num = get_arg(unsigned char);
1889 case FORMAT_TYPE_BYTE:
1890 num = get_arg(signed char);
1892 case FORMAT_TYPE_USHORT:
1893 num = get_arg(unsigned short);
1895 case FORMAT_TYPE_SHORT:
1896 num = get_arg(short);
1898 case FORMAT_TYPE_UINT:
1899 num = get_arg(unsigned int);
1905 str = number(str, end, num, spec);
1907 } /* switch(spec.type) */
1919 /* the trailing null byte doesn't count towards the total */
1922 EXPORT_SYMBOL_GPL(bstr_printf);
1925 * bprintf - Parse a format string and place args' binary value in a buffer
1926 * @bin_buf: The buffer to place args' binary value
1927 * @size: The size of the buffer(by words(32bits), not characters)
1928 * @fmt: The format string to use
1929 * @...: Arguments for the format string
1931 * The function returns the number of words(u32) written
1934 int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
1939 va_start(args, fmt);
1940 ret = vbin_printf(bin_buf, size, fmt, args);
1945 EXPORT_SYMBOL_GPL(bprintf);
1947 #endif /* CONFIG_BINARY_PRINTF */
1950 * vsscanf - Unformat a buffer into a list of arguments
1951 * @buf: input buffer
1952 * @fmt: format of buffer
1955 int vsscanf(const char *buf, const char *fmt, va_list args)
1957 const char *str = buf;
1966 while (*fmt && *str) {
1967 /* skip any white space in format */
1968 /* white space in format matchs any amount of
1969 * white space, including none, in the input.
1971 if (isspace(*fmt)) {
1972 fmt = skip_spaces(++fmt);
1973 str = skip_spaces(str);
1976 /* anything that is not a conversion must match exactly */
1977 if (*fmt != '%' && *fmt) {
1978 if (*fmt++ != *str++)
1987 /* skip this conversion.
1988 * advance both strings to next white space
1991 while (!isspace(*fmt) && *fmt != '%' && *fmt)
1993 while (!isspace(*str) && *str)
1998 /* get field width */
2001 field_width = skip_atoi(&fmt);
2003 /* get conversion qualifier */
2005 if (*fmt == 'h' || TOLOWER(*fmt) == 'l' ||
2006 TOLOWER(*fmt) == 'z') {
2008 if (unlikely(qualifier == *fmt)) {
2009 if (qualifier == 'h') {
2012 } else if (qualifier == 'l') {
2028 char *s = (char *)va_arg(args, char*);
2029 if (field_width == -1)
2033 } while (--field_width > 0 && *str);
2039 char *s = (char *)va_arg(args, char *);
2040 if (field_width == -1)
2041 field_width = SHRT_MAX;
2042 /* first, skip leading white space in buffer */
2043 str = skip_spaces(str);
2045 /* now copy until next white space */
2046 while (*str && !isspace(*str) && field_width--)
2053 /* return number of characters read so far */
2055 int *i = (int *)va_arg(args, int*);
2073 /* looking for '%' in str */
2078 /* invalid format; stop here */
2082 /* have some sort of integer conversion.
2083 * first, skip white space in buffer.
2085 str = skip_spaces(str);
2088 if (is_sign && digit == '-')
2092 || (base == 16 && !isxdigit(digit))
2093 || (base == 10 && !isdigit(digit))
2094 || (base == 8 && (!isdigit(digit) || digit > '7'))
2095 || (base == 0 && !isdigit(digit)))
2098 switch (qualifier) {
2099 case 'H': /* that's 'hh' in format */
2101 signed char *s = (signed char *)va_arg(args, signed char *);
2102 *s = (signed char)simple_strtol(str, &next, base);
2104 unsigned char *s = (unsigned char *)va_arg(args, unsigned char *);
2105 *s = (unsigned char)simple_strtoul(str, &next, base);
2110 short *s = (short *)va_arg(args, short *);
2111 *s = (short)simple_strtol(str, &next, base);
2113 unsigned short *s = (unsigned short *)va_arg(args, unsigned short *);
2114 *s = (unsigned short)simple_strtoul(str, &next, base);
2119 long *l = (long *)va_arg(args, long *);
2120 *l = simple_strtol(str, &next, base);
2122 unsigned long *l = (unsigned long *)va_arg(args, unsigned long *);
2123 *l = simple_strtoul(str, &next, base);
2128 long long *l = (long long *)va_arg(args, long long *);
2129 *l = simple_strtoll(str, &next, base);
2131 unsigned long long *l = (unsigned long long *)va_arg(args, unsigned long long *);
2132 *l = simple_strtoull(str, &next, base);
2138 size_t *s = (size_t *)va_arg(args, size_t *);
2139 *s = (size_t)simple_strtoul(str, &next, base);
2144 int *i = (int *)va_arg(args, int *);
2145 *i = (int)simple_strtol(str, &next, base);
2147 unsigned int *i = (unsigned int *)va_arg(args, unsigned int*);
2148 *i = (unsigned int)simple_strtoul(str, &next, base);
2160 * Now we've come all the way through so either the input string or the
2161 * format ended. In the former case, there can be a %n at the current
2162 * position in the format that needs to be filled.
2164 if (*fmt == '%' && *(fmt + 1) == 'n') {
2165 int *p = (int *)va_arg(args, int *);
2171 EXPORT_SYMBOL(vsscanf);
2174 * sscanf - Unformat a buffer into a list of arguments
2175 * @buf: input buffer
2176 * @fmt: formatting of buffer
2177 * @...: resulting arguments
2179 int sscanf(const char *buf, const char *fmt, ...)
2184 va_start(args, fmt);
2185 i = vsscanf(buf, fmt, args);
2190 EXPORT_SYMBOL(sscanf);