4 * Copyright (C) 1991, 1992 Linus Torvalds
7 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
9 * Wirzenius wrote this portably, Torvalds fucked it up :-)
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
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
);
123 static noinline_for_stack
124 int skip_atoi(const char **s
)
129 i
= i
*10 + *((*s
)++) - '0';
134 /* Decimal conversion is by far the most typical, and is used
135 * for /proc and /sys data. This directly impacts e.g. top performance
136 * with many processes running. We optimize it for speed
138 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
139 * (with permission from the author, Douglas W. Jones). */
141 /* Formats correctly any integer in [0,99999].
142 * Outputs from one to five digits depending on input.
143 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
144 static noinline_for_stack
145 char *put_dec_trunc(char *buf
, unsigned q
)
147 unsigned d3
, d2
, d1
, d0
;
152 d0
= 6*(d3
+ d2
+ d1
) + (q
& 0xf);
153 q
= (d0
* 0xcd) >> 11;
155 *buf
++ = d0
+ '0'; /* least significant digit */
156 d1
= q
+ 9*d3
+ 5*d2
+ d1
;
158 q
= (d1
* 0xcd) >> 11;
160 *buf
++ = d1
+ '0'; /* next digit */
163 if ((d2
!= 0) || (d3
!= 0)) {
166 *buf
++ = d2
+ '0'; /* next digit */
170 q
= (d3
* 0xcd) >> 11;
172 *buf
++ = d3
+ '0'; /* next digit */
174 *buf
++ = q
+ '0'; /* most sign. digit */
181 /* Same with if's removed. Always emits five digits */
182 static noinline_for_stack
183 char *put_dec_full(char *buf
, unsigned q
)
185 /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
186 /* but anyway, gcc produces better code with full-sized ints */
187 unsigned d3
, d2
, d1
, d0
;
193 * Possible ways to approx. divide by 10
194 * gcc -O2 replaces multiply with shifts and adds
195 * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
196 * (x * 0x67) >> 10: 1100111
197 * (x * 0x34) >> 9: 110100 - same
198 * (x * 0x1a) >> 8: 11010 - same
199 * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
201 d0
= 6*(d3
+ d2
+ d1
) + (q
& 0xf);
202 q
= (d0
* 0xcd) >> 11;
205 d1
= q
+ 9*d3
+ 5*d2
+ d1
;
206 q
= (d1
* 0xcd) >> 11;
216 q
= (d3
* 0xcd) >> 11; /* - shorter code */
217 /* q = (d3 * 0x67) >> 10; - would also work */
224 /* No inlining helps gcc to use registers better */
225 static noinline_for_stack
226 char *put_dec(char *buf
, unsigned long long num
)
231 return put_dec_trunc(buf
, num
);
232 rem
= do_div(num
, 100000);
233 buf
= put_dec_full(buf
, rem
);
237 #define ZEROPAD 1 /* pad with zero */
238 #define SIGN 2 /* unsigned/signed long */
239 #define PLUS 4 /* show plus */
240 #define SPACE 8 /* space if plus */
241 #define LEFT 16 /* left justified */
242 #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
243 #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
246 FORMAT_TYPE_NONE
, /* Just a string part */
248 FORMAT_TYPE_PRECISION
,
252 FORMAT_TYPE_PERCENT_CHAR
,
254 FORMAT_TYPE_LONG_LONG
,
269 u8 type
; /* format_type enum */
270 u8 flags
; /* flags to number() */
271 u8 base
; /* number base, 8, 10 or 16 only */
272 u8 qualifier
; /* number qualifier, one of 'hHlLtzZ' */
273 s16 field_width
; /* width of output field */
274 s16 precision
; /* # of digits/chars */
277 static noinline_for_stack
278 char *number(char *buf
, char *end
, unsigned long long num
,
279 struct printf_spec spec
)
281 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
282 static const char digits
[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
287 int need_pfx
= ((spec
.flags
& SPECIAL
) && spec
.base
!= 10);
290 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
291 * produces same digits or (maybe lowercased) letters */
292 locase
= (spec
.flags
& SMALL
);
293 if (spec
.flags
& LEFT
)
294 spec
.flags
&= ~ZEROPAD
;
296 if (spec
.flags
& SIGN
) {
297 if ((signed long long)num
< 0) {
299 num
= -(signed long long)num
;
301 } else if (spec
.flags
& PLUS
) {
304 } else if (spec
.flags
& SPACE
) {
315 /* generate full string in tmp[], in reverse order */
319 /* Generic code, for any base:
321 tmp[i++] = (digits[do_div(num,base)] | locase);
324 else if (spec
.base
!= 10) { /* 8 or 16 */
325 int mask
= spec
.base
- 1;
331 tmp
[i
++] = (digits
[((unsigned char)num
) & mask
] | locase
);
334 } else { /* base 10 */
335 i
= put_dec(tmp
, num
) - tmp
;
338 /* printing 100 using %2d gives "100", not "00" */
339 if (i
> spec
.precision
)
341 /* leading space padding */
342 spec
.field_width
-= spec
.precision
;
343 if (!(spec
.flags
& (ZEROPAD
+LEFT
))) {
344 while (--spec
.field_width
>= 0) {
356 /* "0x" / "0" prefix */
361 if (spec
.base
== 16) {
363 *buf
= ('X' | locase
);
367 /* zero or space padding */
368 if (!(spec
.flags
& LEFT
)) {
369 char c
= (spec
.flags
& ZEROPAD
) ? '0' : ' ';
370 while (--spec
.field_width
>= 0) {
376 /* hmm even more zero padding? */
377 while (i
<= --spec
.precision
) {
382 /* actual digits of result */
388 /* trailing space padding */
389 while (--spec
.field_width
>= 0) {
398 static noinline_for_stack
399 char *string(char *buf
, char *end
, const char *s
, struct printf_spec spec
)
403 if ((unsigned long)s
< PAGE_SIZE
)
406 len
= strnlen(s
, spec
.precision
);
408 if (!(spec
.flags
& LEFT
)) {
409 while (len
< spec
.field_width
--) {
415 for (i
= 0; i
< len
; ++i
) {
420 while (len
< spec
.field_width
--) {
429 static noinline_for_stack
430 char *symbol_string(char *buf
, char *end
, void *ptr
,
431 struct printf_spec spec
, char ext
)
433 unsigned long value
= (unsigned long) ptr
;
434 #ifdef CONFIG_KALLSYMS
435 char sym
[KSYM_SYMBOL_LEN
];
437 sprint_backtrace(sym
, value
);
438 else if (ext
!= 'f' && ext
!= 's')
439 sprint_symbol(sym
, value
);
441 kallsyms_lookup(value
, NULL
, NULL
, NULL
, sym
);
443 return string(buf
, end
, sym
, spec
);
445 spec
.field_width
= 2 * sizeof(void *);
446 spec
.flags
|= SPECIAL
| SMALL
| ZEROPAD
;
449 return number(buf
, end
, value
, spec
);
453 static noinline_for_stack
454 char *resource_string(char *buf
, char *end
, struct resource
*res
,
455 struct printf_spec spec
, const char *fmt
)
457 #ifndef IO_RSRC_PRINTK_SIZE
458 #define IO_RSRC_PRINTK_SIZE 6
461 #ifndef MEM_RSRC_PRINTK_SIZE
462 #define MEM_RSRC_PRINTK_SIZE 10
464 static const struct printf_spec io_spec
= {
466 .field_width
= IO_RSRC_PRINTK_SIZE
,
468 .flags
= SPECIAL
| SMALL
| ZEROPAD
,
470 static const struct printf_spec mem_spec
= {
472 .field_width
= MEM_RSRC_PRINTK_SIZE
,
474 .flags
= SPECIAL
| SMALL
| ZEROPAD
,
476 static const struct printf_spec bus_spec
= {
480 .flags
= SMALL
| ZEROPAD
,
482 static const struct printf_spec dec_spec
= {
487 static const struct printf_spec str_spec
= {
492 static const struct printf_spec flag_spec
= {
495 .flags
= SPECIAL
| SMALL
,
498 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
499 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
500 #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
501 #define FLAG_BUF_SIZE (2 * sizeof(res->flags))
502 #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
503 #define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
504 char sym
[max(2*RSRC_BUF_SIZE
+ DECODED_BUF_SIZE
,
505 2*RSRC_BUF_SIZE
+ FLAG_BUF_SIZE
+ RAW_BUF_SIZE
)];
507 char *p
= sym
, *pend
= sym
+ sizeof(sym
);
508 int decode
= (fmt
[0] == 'R') ? 1 : 0;
509 const struct printf_spec
*specp
;
512 if (res
->flags
& IORESOURCE_IO
) {
513 p
= string(p
, pend
, "io ", str_spec
);
515 } else if (res
->flags
& IORESOURCE_MEM
) {
516 p
= string(p
, pend
, "mem ", str_spec
);
518 } else if (res
->flags
& IORESOURCE_IRQ
) {
519 p
= string(p
, pend
, "irq ", str_spec
);
521 } else if (res
->flags
& IORESOURCE_DMA
) {
522 p
= string(p
, pend
, "dma ", str_spec
);
524 } else if (res
->flags
& IORESOURCE_BUS
) {
525 p
= string(p
, pend
, "bus ", str_spec
);
528 p
= string(p
, pend
, "??? ", str_spec
);
532 p
= number(p
, pend
, res
->start
, *specp
);
533 if (res
->start
!= res
->end
) {
535 p
= number(p
, pend
, res
->end
, *specp
);
538 if (res
->flags
& IORESOURCE_MEM_64
)
539 p
= string(p
, pend
, " 64bit", str_spec
);
540 if (res
->flags
& IORESOURCE_PREFETCH
)
541 p
= string(p
, pend
, " pref", str_spec
);
542 if (res
->flags
& IORESOURCE_WINDOW
)
543 p
= string(p
, pend
, " window", str_spec
);
544 if (res
->flags
& IORESOURCE_DISABLED
)
545 p
= string(p
, pend
, " disabled", str_spec
);
547 p
= string(p
, pend
, " flags ", str_spec
);
548 p
= number(p
, pend
, res
->flags
, flag_spec
);
553 return string(buf
, end
, sym
, spec
);
556 static noinline_for_stack
557 char *mac_address_string(char *buf
, char *end
, u8
*addr
,
558 struct printf_spec spec
, const char *fmt
)
560 char mac_addr
[sizeof("xx:xx:xx:xx:xx:xx")];
565 if (fmt
[1] == 'F') { /* FDDI canonical format */
571 for (i
= 0; i
< 6; i
++) {
572 p
= pack_hex_byte(p
, addr
[i
]);
573 if (fmt
[0] == 'M' && i
!= 5)
578 return string(buf
, end
, mac_addr
, spec
);
581 static noinline_for_stack
582 char *ip4_string(char *p
, const u8
*addr
, const char *fmt
)
585 bool leading_zeros
= (fmt
[0] == 'i');
610 for (i
= 0; i
< 4; i
++) {
611 char temp
[3]; /* hold each IP quad in reverse order */
612 int digits
= put_dec_trunc(temp
, addr
[index
]) - temp
;
619 /* reverse the digits in the quad */
631 static noinline_for_stack
632 char *ip6_compressed_string(char *p
, const char *addr
)
635 unsigned char zerolength
[8];
640 bool needcolon
= false;
644 memcpy(&in6
, addr
, sizeof(struct in6_addr
));
646 useIPv4
= ipv6_addr_v4mapped(&in6
) || ipv6_addr_is_isatap(&in6
);
648 memset(zerolength
, 0, sizeof(zerolength
));
655 /* find position of longest 0 run */
656 for (i
= 0; i
< range
; i
++) {
657 for (j
= i
; j
< range
; j
++) {
658 if (in6
.s6_addr16
[j
] != 0)
663 for (i
= 0; i
< range
; i
++) {
664 if (zerolength
[i
] > longest
) {
665 longest
= zerolength
[i
];
671 for (i
= 0; i
< range
; i
++) {
673 if (needcolon
|| i
== 0)
684 /* hex u16 without leading 0s */
685 word
= ntohs(in6
.s6_addr16
[i
]);
690 p
= pack_hex_byte(p
, hi
);
692 *p
++ = hex_asc_lo(hi
);
693 p
= pack_hex_byte(p
, lo
);
696 p
= pack_hex_byte(p
, lo
);
698 *p
++ = hex_asc_lo(lo
);
705 p
= ip4_string(p
, &in6
.s6_addr
[12], "I4");
712 static noinline_for_stack
713 char *ip6_string(char *p
, const char *addr
, const char *fmt
)
717 for (i
= 0; i
< 8; i
++) {
718 p
= pack_hex_byte(p
, *addr
++);
719 p
= pack_hex_byte(p
, *addr
++);
720 if (fmt
[0] == 'I' && i
!= 7)
728 static noinline_for_stack
729 char *ip6_addr_string(char *buf
, char *end
, const u8
*addr
,
730 struct printf_spec spec
, const char *fmt
)
732 char ip6_addr
[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
734 if (fmt
[0] == 'I' && fmt
[2] == 'c')
735 ip6_compressed_string(ip6_addr
, addr
);
737 ip6_string(ip6_addr
, addr
, fmt
);
739 return string(buf
, end
, ip6_addr
, spec
);
742 static noinline_for_stack
743 char *ip4_addr_string(char *buf
, char *end
, const u8
*addr
,
744 struct printf_spec spec
, const char *fmt
)
746 char ip4_addr
[sizeof("255.255.255.255")];
748 ip4_string(ip4_addr
, addr
, fmt
);
750 return string(buf
, end
, ip4_addr
, spec
);
753 static noinline_for_stack
754 char *uuid_string(char *buf
, char *end
, const u8
*addr
,
755 struct printf_spec spec
, const char *fmt
)
757 char uuid
[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")];
760 static const u8 be
[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
761 static const u8 le
[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15};
762 const u8
*index
= be
;
767 uc
= true; /* fall-through */
776 for (i
= 0; i
< 16; i
++) {
777 p
= pack_hex_byte(p
, addr
[index
[i
]]);
797 return string(buf
, end
, uuid
, spec
);
800 int kptr_restrict
= 1;
803 * Show a '%p' thing. A kernel extension is that the '%p' is followed
804 * by an extra set of alphanumeric characters that are extended format
807 * Right now we handle:
809 * - 'F' For symbolic function descriptor pointers with offset
810 * - 'f' For simple symbolic function names without offset
811 * - 'S' For symbolic direct pointers with offset
812 * - 's' For symbolic direct pointers without offset
813 * - 'B' For backtraced symbolic direct pointers with offset
814 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
815 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
816 * - 'M' For a 6-byte MAC address, it prints the address in the
817 * usual colon-separated hex notation
818 * - 'm' For a 6-byte MAC address, it prints the hex address without colons
819 * - 'MF' For a 6-byte MAC FDDI address, it prints the address
820 * with a dash-separated hex notation
821 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
822 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
823 * IPv6 uses colon separated network-order 16 bit hex with leading 0's
824 * - 'i' [46] for 'raw' IPv4/IPv6 addresses
825 * IPv6 omits the colons (01020304...0f)
826 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
827 * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order
828 * - 'I6c' for IPv6 addresses printed as specified by
829 * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00
830 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
831 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
832 * Options for %pU are:
833 * b big endian lower case hex (default)
834 * B big endian UPPER case hex
835 * l little endian lower case hex
836 * L little endian UPPER case hex
837 * big endian output byte order is:
838 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
839 * little endian output byte order is:
840 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
841 * - 'V' For a struct va_format which contains a format string * and va_list *,
842 * call vsnprintf(->format, *->va_list).
843 * Implements a "recursive vsnprintf".
844 * Do not use this feature without some mechanism to verify the
845 * correctness of the format string and va_list arguments.
846 * - 'K' For a kernel pointer that should be hidden from unprivileged users
848 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
849 * function pointers are really function descriptors, which contain a
850 * pointer to the real address.
852 static noinline_for_stack
853 char *pointer(const char *fmt
, char *buf
, char *end
, void *ptr
,
854 struct printf_spec spec
)
856 if (!ptr
&& *fmt
!= 'K') {
858 * Print (null) with the same width as a pointer so it makes
859 * tabular output look nice.
861 if (spec
.field_width
== -1)
862 spec
.field_width
= 2 * sizeof(void *);
863 return string(buf
, end
, "(null)", spec
);
869 ptr
= dereference_function_descriptor(ptr
);
874 return symbol_string(buf
, end
, ptr
, spec
, *fmt
);
877 return resource_string(buf
, end
, ptr
, spec
, fmt
);
878 case 'M': /* Colon separated: 00:01:02:03:04:05 */
879 case 'm': /* Contiguous: 000102030405 */
880 /* [mM]F (FDDI, bit reversed) */
881 return mac_address_string(buf
, end
, ptr
, spec
, fmt
);
882 case 'I': /* Formatted IP supported
884 * 6: 0001:0203:...:0708
885 * 6c: 1::708 or 1::1.2.3.4
887 case 'i': /* Contiguous:
893 return ip6_addr_string(buf
, end
, ptr
, spec
, fmt
);
895 return ip4_addr_string(buf
, end
, ptr
, spec
, fmt
);
899 return uuid_string(buf
, end
, ptr
, spec
, fmt
);
901 return buf
+ vsnprintf(buf
, end
- buf
,
902 ((struct va_format
*)ptr
)->fmt
,
903 *(((struct va_format
*)ptr
)->va
));
906 * %pK cannot be used in IRQ context because its test
907 * for CAP_SYSLOG would be meaningless.
909 if (in_irq() || in_serving_softirq() || in_nmi()) {
910 if (spec
.field_width
== -1)
911 spec
.field_width
= 2 * sizeof(void *);
912 return string(buf
, end
, "pK-error", spec
);
914 if (!((kptr_restrict
== 0) ||
915 (kptr_restrict
== 1 &&
916 has_capability_noaudit(current
, CAP_SYSLOG
))))
921 if (spec
.field_width
== -1) {
922 spec
.field_width
= 2 * sizeof(void *);
923 spec
.flags
|= ZEROPAD
;
927 return number(buf
, end
, (unsigned long) ptr
, spec
);
931 * Helper function to decode printf style format.
932 * Each call decode a token from the format and return the
933 * number of characters read (or likely the delta where it wants
934 * to go on the next call).
935 * The decoded token is returned through the parameters
937 * 'h', 'l', or 'L' for integer fields
938 * 'z' support added 23/7/1999 S.H.
939 * 'z' changed to 'Z' --davidm 1/25/99
940 * 't' added for ptrdiff_t
942 * @fmt: the format string
943 * @type of the token returned
944 * @flags: various flags such as +, -, # tokens..
945 * @field_width: overwritten width
946 * @base: base of the number (octal, hex, ...)
947 * @precision: precision of a number
948 * @qualifier: qualifier of a number (long, size_t, ...)
950 static noinline_for_stack
951 int format_decode(const char *fmt
, struct printf_spec
*spec
)
953 const char *start
= fmt
;
955 /* we finished early by reading the field width */
956 if (spec
->type
== FORMAT_TYPE_WIDTH
) {
957 if (spec
->field_width
< 0) {
958 spec
->field_width
= -spec
->field_width
;
961 spec
->type
= FORMAT_TYPE_NONE
;
965 /* we finished early by reading the precision */
966 if (spec
->type
== FORMAT_TYPE_PRECISION
) {
967 if (spec
->precision
< 0)
970 spec
->type
= FORMAT_TYPE_NONE
;
975 spec
->type
= FORMAT_TYPE_NONE
;
977 for (; *fmt
; ++fmt
) {
982 /* Return the current non-format string */
983 if (fmt
!= start
|| !*fmt
)
989 while (1) { /* this also skips first '%' */
995 case '-': spec
->flags
|= LEFT
; break;
996 case '+': spec
->flags
|= PLUS
; break;
997 case ' ': spec
->flags
|= SPACE
; break;
998 case '#': spec
->flags
|= SPECIAL
; break;
999 case '0': spec
->flags
|= ZEROPAD
; break;
1000 default: found
= false;
1007 /* get field width */
1008 spec
->field_width
= -1;
1011 spec
->field_width
= skip_atoi(&fmt
);
1012 else if (*fmt
== '*') {
1013 /* it's the next argument */
1014 spec
->type
= FORMAT_TYPE_WIDTH
;
1015 return ++fmt
- start
;
1019 /* get the precision */
1020 spec
->precision
= -1;
1023 if (isdigit(*fmt
)) {
1024 spec
->precision
= skip_atoi(&fmt
);
1025 if (spec
->precision
< 0)
1026 spec
->precision
= 0;
1027 } else if (*fmt
== '*') {
1028 /* it's the next argument */
1029 spec
->type
= FORMAT_TYPE_PRECISION
;
1030 return ++fmt
- start
;
1035 /* get the conversion qualifier */
1036 spec
->qualifier
= -1;
1037 if (*fmt
== 'h' || TOLOWER(*fmt
) == 'l' ||
1038 TOLOWER(*fmt
) == 'z' || *fmt
== 't') {
1039 spec
->qualifier
= *fmt
++;
1040 if (unlikely(spec
->qualifier
== *fmt
)) {
1041 if (spec
->qualifier
== 'l') {
1042 spec
->qualifier
= 'L';
1044 } else if (spec
->qualifier
== 'h') {
1045 spec
->qualifier
= 'H';
1055 spec
->type
= FORMAT_TYPE_CHAR
;
1056 return ++fmt
- start
;
1059 spec
->type
= FORMAT_TYPE_STR
;
1060 return ++fmt
- start
;
1063 spec
->type
= FORMAT_TYPE_PTR
;
1068 spec
->type
= FORMAT_TYPE_NRCHARS
;
1069 return ++fmt
- start
;
1072 spec
->type
= FORMAT_TYPE_PERCENT_CHAR
;
1073 return ++fmt
- start
;
1075 /* integer number formats - set up the flags and "break" */
1081 spec
->flags
|= SMALL
;
1089 spec
->flags
|= SIGN
;
1094 spec
->type
= FORMAT_TYPE_INVALID
;
1098 if (spec
->qualifier
== 'L')
1099 spec
->type
= FORMAT_TYPE_LONG_LONG
;
1100 else if (spec
->qualifier
== 'l') {
1101 if (spec
->flags
& SIGN
)
1102 spec
->type
= FORMAT_TYPE_LONG
;
1104 spec
->type
= FORMAT_TYPE_ULONG
;
1105 } else if (TOLOWER(spec
->qualifier
) == 'z') {
1106 spec
->type
= FORMAT_TYPE_SIZE_T
;
1107 } else if (spec
->qualifier
== 't') {
1108 spec
->type
= FORMAT_TYPE_PTRDIFF
;
1109 } else if (spec
->qualifier
== 'H') {
1110 if (spec
->flags
& SIGN
)
1111 spec
->type
= FORMAT_TYPE_BYTE
;
1113 spec
->type
= FORMAT_TYPE_UBYTE
;
1114 } else if (spec
->qualifier
== 'h') {
1115 if (spec
->flags
& SIGN
)
1116 spec
->type
= FORMAT_TYPE_SHORT
;
1118 spec
->type
= FORMAT_TYPE_USHORT
;
1120 if (spec
->flags
& SIGN
)
1121 spec
->type
= FORMAT_TYPE_INT
;
1123 spec
->type
= FORMAT_TYPE_UINT
;
1126 return ++fmt
- start
;
1130 * vsnprintf - Format a string and place it in a buffer
1131 * @buf: The buffer to place the result into
1132 * @size: The size of the buffer, including the trailing null space
1133 * @fmt: The format string to use
1134 * @args: Arguments for the format string
1136 * This function follows C99 vsnprintf, but has some extensions:
1137 * %pS output the name of a text symbol with offset
1138 * %ps output the name of a text symbol without offset
1139 * %pF output the name of a function pointer with its offset
1140 * %pf output the name of a function pointer without its offset
1141 * %pB output the name of a backtrace symbol with its offset
1142 * %pR output the address range in a struct resource with decoded flags
1143 * %pr output the address range in a struct resource with raw flags
1144 * %pM output a 6-byte MAC address with colons
1145 * %pm output a 6-byte MAC address without colons
1146 * %pI4 print an IPv4 address without leading zeros
1147 * %pi4 print an IPv4 address with leading zeros
1148 * %pI6 print an IPv6 address with colons
1149 * %pi6 print an IPv6 address without colons
1150 * %pI6c print an IPv6 address as specified by
1151 * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00
1152 * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
1156 * The return value is the number of characters which would
1157 * be generated for the given input, excluding the trailing
1158 * '\0', as per ISO C99. If you want to have the exact
1159 * number of characters written into @buf as return value
1160 * (not including the trailing '\0'), use vscnprintf(). If the
1161 * return is greater than or equal to @size, the resulting
1162 * string is truncated.
1164 * Call this function if you are already dealing with a va_list.
1165 * You probably want snprintf() instead.
1167 int vsnprintf(char *buf
, size_t size
, const char *fmt
, va_list args
)
1169 unsigned long long num
;
1171 struct printf_spec spec
= {0};
1173 /* Reject out-of-range values early. Large positive sizes are
1174 used for unknown buffer sizes. */
1175 if (WARN_ON_ONCE((int) size
< 0))
1181 /* Make sure end is always >= buf */
1188 const char *old_fmt
= fmt
;
1189 int read
= format_decode(fmt
, &spec
);
1193 switch (spec
.type
) {
1194 case FORMAT_TYPE_NONE
: {
1197 if (copy
> end
- str
)
1199 memcpy(str
, old_fmt
, copy
);
1205 case FORMAT_TYPE_WIDTH
:
1206 spec
.field_width
= va_arg(args
, int);
1209 case FORMAT_TYPE_PRECISION
:
1210 spec
.precision
= va_arg(args
, int);
1213 case FORMAT_TYPE_CHAR
: {
1216 if (!(spec
.flags
& LEFT
)) {
1217 while (--spec
.field_width
> 0) {
1224 c
= (unsigned char) va_arg(args
, int);
1228 while (--spec
.field_width
> 0) {
1236 case FORMAT_TYPE_STR
:
1237 str
= string(str
, end
, va_arg(args
, char *), spec
);
1240 case FORMAT_TYPE_PTR
:
1241 str
= pointer(fmt
+1, str
, end
, va_arg(args
, void *),
1243 while (isalnum(*fmt
))
1247 case FORMAT_TYPE_PERCENT_CHAR
:
1253 case FORMAT_TYPE_INVALID
:
1259 case FORMAT_TYPE_NRCHARS
: {
1260 u8 qualifier
= spec
.qualifier
;
1262 if (qualifier
== 'l') {
1263 long *ip
= va_arg(args
, long *);
1265 } else if (TOLOWER(qualifier
) == 'z') {
1266 size_t *ip
= va_arg(args
, size_t *);
1269 int *ip
= va_arg(args
, int *);
1276 switch (spec
.type
) {
1277 case FORMAT_TYPE_LONG_LONG
:
1278 num
= va_arg(args
, long long);
1280 case FORMAT_TYPE_ULONG
:
1281 num
= va_arg(args
, unsigned long);
1283 case FORMAT_TYPE_LONG
:
1284 num
= va_arg(args
, long);
1286 case FORMAT_TYPE_SIZE_T
:
1287 num
= va_arg(args
, size_t);
1289 case FORMAT_TYPE_PTRDIFF
:
1290 num
= va_arg(args
, ptrdiff_t);
1292 case FORMAT_TYPE_UBYTE
:
1293 num
= (unsigned char) va_arg(args
, int);
1295 case FORMAT_TYPE_BYTE
:
1296 num
= (signed char) va_arg(args
, int);
1298 case FORMAT_TYPE_USHORT
:
1299 num
= (unsigned short) va_arg(args
, int);
1301 case FORMAT_TYPE_SHORT
:
1302 num
= (short) va_arg(args
, int);
1304 case FORMAT_TYPE_INT
:
1305 num
= (int) va_arg(args
, int);
1308 num
= va_arg(args
, unsigned int);
1311 str
= number(str
, end
, num
, spec
);
1322 /* the trailing null byte doesn't count towards the total */
1326 EXPORT_SYMBOL(vsnprintf
);
1329 * vscnprintf - Format a string and place it in a buffer
1330 * @buf: The buffer to place the result into
1331 * @size: The size of the buffer, including the trailing null space
1332 * @fmt: The format string to use
1333 * @args: Arguments for the format string
1335 * The return value is the number of characters which have been written into
1336 * the @buf not including the trailing '\0'. If @size is == 0 the function
1339 * Call this function if you are already dealing with a va_list.
1340 * You probably want scnprintf() instead.
1342 * See the vsnprintf() documentation for format string extensions over C99.
1344 int vscnprintf(char *buf
, size_t size
, const char *fmt
, va_list args
)
1348 i
= vsnprintf(buf
, size
, fmt
, args
);
1350 if (likely(i
< size
))
1356 EXPORT_SYMBOL(vscnprintf
);
1359 * snprintf - Format a string and place it in a buffer
1360 * @buf: The buffer to place the result into
1361 * @size: The size of the buffer, including the trailing null space
1362 * @fmt: The format string to use
1363 * @...: Arguments for the format string
1365 * The return value is the number of characters which would be
1366 * generated for the given input, excluding the trailing null,
1367 * as per ISO C99. If the return is greater than or equal to
1368 * @size, the resulting string is truncated.
1370 * See the vsnprintf() documentation for format string extensions over C99.
1372 int snprintf(char *buf
, size_t size
, const char *fmt
, ...)
1377 va_start(args
, fmt
);
1378 i
= vsnprintf(buf
, size
, fmt
, args
);
1383 EXPORT_SYMBOL(snprintf
);
1386 * scnprintf - Format a string and place it in a buffer
1387 * @buf: The buffer to place the result into
1388 * @size: The size of the buffer, including the trailing null space
1389 * @fmt: The format string to use
1390 * @...: Arguments for the format string
1392 * The return value is the number of characters written into @buf not including
1393 * the trailing '\0'. If @size is == 0 the function returns 0.
1396 int scnprintf(char *buf
, size_t size
, const char *fmt
, ...)
1401 va_start(args
, fmt
);
1402 i
= vscnprintf(buf
, size
, fmt
, args
);
1407 EXPORT_SYMBOL(scnprintf
);
1410 * vsprintf - Format a string and place it in a buffer
1411 * @buf: The buffer to place the result into
1412 * @fmt: The format string to use
1413 * @args: Arguments for the format string
1415 * The function returns the number of characters written
1416 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
1419 * Call this function if you are already dealing with a va_list.
1420 * You probably want sprintf() instead.
1422 * See the vsnprintf() documentation for format string extensions over C99.
1424 int vsprintf(char *buf
, const char *fmt
, va_list args
)
1426 return vsnprintf(buf
, INT_MAX
, fmt
, args
);
1428 EXPORT_SYMBOL(vsprintf
);
1431 * sprintf - Format a string and place it in a buffer
1432 * @buf: The buffer to place the result into
1433 * @fmt: The format string to use
1434 * @...: Arguments for the format string
1436 * The function returns the number of characters written
1437 * into @buf. Use snprintf() or scnprintf() in order to avoid
1440 * See the vsnprintf() documentation for format string extensions over C99.
1442 int sprintf(char *buf
, const char *fmt
, ...)
1447 va_start(args
, fmt
);
1448 i
= vsnprintf(buf
, INT_MAX
, fmt
, args
);
1453 EXPORT_SYMBOL(sprintf
);
1455 #ifdef CONFIG_BINARY_PRINTF
1458 * vbin_printf() - VA arguments to binary data
1459 * bstr_printf() - Binary data to text string
1463 * vbin_printf - Parse a format string and place args' binary value in a buffer
1464 * @bin_buf: The buffer to place args' binary value
1465 * @size: The size of the buffer(by words(32bits), not characters)
1466 * @fmt: The format string to use
1467 * @args: Arguments for the format string
1469 * The format follows C99 vsnprintf, except %n is ignored, and its argument
1472 * The return value is the number of words(32bits) which would be generated for
1476 * If the return value is greater than @size, the resulting bin_buf is NOT
1477 * valid for bstr_printf().
1479 int vbin_printf(u32
*bin_buf
, size_t size
, const char *fmt
, va_list args
)
1481 struct printf_spec spec
= {0};
1484 str
= (char *)bin_buf
;
1485 end
= (char *)(bin_buf
+ size
);
1487 #define save_arg(type) \
1489 if (sizeof(type) == 8) { \
1490 unsigned long long value; \
1491 str = PTR_ALIGN(str, sizeof(u32)); \
1492 value = va_arg(args, unsigned long long); \
1493 if (str + sizeof(type) <= end) { \
1494 *(u32 *)str = *(u32 *)&value; \
1495 *(u32 *)(str + 4) = *((u32 *)&value + 1); \
1498 unsigned long value; \
1499 str = PTR_ALIGN(str, sizeof(type)); \
1500 value = va_arg(args, int); \
1501 if (str + sizeof(type) <= end) \
1502 *(typeof(type) *)str = (type)value; \
1504 str += sizeof(type); \
1508 int read
= format_decode(fmt
, &spec
);
1512 switch (spec
.type
) {
1513 case FORMAT_TYPE_NONE
:
1514 case FORMAT_TYPE_INVALID
:
1515 case FORMAT_TYPE_PERCENT_CHAR
:
1518 case FORMAT_TYPE_WIDTH
:
1519 case FORMAT_TYPE_PRECISION
:
1523 case FORMAT_TYPE_CHAR
:
1527 case FORMAT_TYPE_STR
: {
1528 const char *save_str
= va_arg(args
, char *);
1531 if ((unsigned long)save_str
> (unsigned long)-PAGE_SIZE
1532 || (unsigned long)save_str
< PAGE_SIZE
)
1533 save_str
= "(null)";
1534 len
= strlen(save_str
) + 1;
1535 if (str
+ len
< end
)
1536 memcpy(str
, save_str
, len
);
1541 case FORMAT_TYPE_PTR
:
1543 /* skip all alphanumeric pointer suffixes */
1544 while (isalnum(*fmt
))
1548 case FORMAT_TYPE_NRCHARS
: {
1549 /* skip %n 's argument */
1550 u8 qualifier
= spec
.qualifier
;
1552 if (qualifier
== 'l')
1553 skip_arg
= va_arg(args
, long *);
1554 else if (TOLOWER(qualifier
) == 'z')
1555 skip_arg
= va_arg(args
, size_t *);
1557 skip_arg
= va_arg(args
, int *);
1562 switch (spec
.type
) {
1564 case FORMAT_TYPE_LONG_LONG
:
1565 save_arg(long long);
1567 case FORMAT_TYPE_ULONG
:
1568 case FORMAT_TYPE_LONG
:
1569 save_arg(unsigned long);
1571 case FORMAT_TYPE_SIZE_T
:
1574 case FORMAT_TYPE_PTRDIFF
:
1575 save_arg(ptrdiff_t);
1577 case FORMAT_TYPE_UBYTE
:
1578 case FORMAT_TYPE_BYTE
:
1581 case FORMAT_TYPE_USHORT
:
1582 case FORMAT_TYPE_SHORT
:
1591 return (u32
*)(PTR_ALIGN(str
, sizeof(u32
))) - bin_buf
;
1594 EXPORT_SYMBOL_GPL(vbin_printf
);
1597 * bstr_printf - Format a string from binary arguments and place it in a buffer
1598 * @buf: The buffer to place the result into
1599 * @size: The size of the buffer, including the trailing null space
1600 * @fmt: The format string to use
1601 * @bin_buf: Binary arguments for the format string
1603 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
1604 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
1605 * a binary buffer that generated by vbin_printf.
1607 * The format follows C99 vsnprintf, but has some extensions:
1608 * see vsnprintf comment for details.
1610 * The return value is the number of characters which would
1611 * be generated for the given input, excluding the trailing
1612 * '\0', as per ISO C99. If you want to have the exact
1613 * number of characters written into @buf as return value
1614 * (not including the trailing '\0'), use vscnprintf(). If the
1615 * return is greater than or equal to @size, the resulting
1616 * string is truncated.
1618 int bstr_printf(char *buf
, size_t size
, const char *fmt
, const u32
*bin_buf
)
1620 struct printf_spec spec
= {0};
1622 const char *args
= (const char *)bin_buf
;
1624 if (WARN_ON_ONCE((int) size
< 0))
1630 #define get_arg(type) \
1632 typeof(type) value; \
1633 if (sizeof(type) == 8) { \
1634 args = PTR_ALIGN(args, sizeof(u32)); \
1635 *(u32 *)&value = *(u32 *)args; \
1636 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
1638 args = PTR_ALIGN(args, sizeof(type)); \
1639 value = *(typeof(type) *)args; \
1641 args += sizeof(type); \
1645 /* Make sure end is always >= buf */
1652 const char *old_fmt
= fmt
;
1653 int read
= format_decode(fmt
, &spec
);
1657 switch (spec
.type
) {
1658 case FORMAT_TYPE_NONE
: {
1661 if (copy
> end
- str
)
1663 memcpy(str
, old_fmt
, copy
);
1669 case FORMAT_TYPE_WIDTH
:
1670 spec
.field_width
= get_arg(int);
1673 case FORMAT_TYPE_PRECISION
:
1674 spec
.precision
= get_arg(int);
1677 case FORMAT_TYPE_CHAR
: {
1680 if (!(spec
.flags
& LEFT
)) {
1681 while (--spec
.field_width
> 0) {
1687 c
= (unsigned char) get_arg(char);
1691 while (--spec
.field_width
> 0) {
1699 case FORMAT_TYPE_STR
: {
1700 const char *str_arg
= args
;
1701 args
+= strlen(str_arg
) + 1;
1702 str
= string(str
, end
, (char *)str_arg
, spec
);
1706 case FORMAT_TYPE_PTR
:
1707 str
= pointer(fmt
+1, str
, end
, get_arg(void *), spec
);
1708 while (isalnum(*fmt
))
1712 case FORMAT_TYPE_PERCENT_CHAR
:
1713 case FORMAT_TYPE_INVALID
:
1719 case FORMAT_TYPE_NRCHARS
:
1724 unsigned long long num
;
1726 switch (spec
.type
) {
1728 case FORMAT_TYPE_LONG_LONG
:
1729 num
= get_arg(long long);
1731 case FORMAT_TYPE_ULONG
:
1732 case FORMAT_TYPE_LONG
:
1733 num
= get_arg(unsigned long);
1735 case FORMAT_TYPE_SIZE_T
:
1736 num
= get_arg(size_t);
1738 case FORMAT_TYPE_PTRDIFF
:
1739 num
= get_arg(ptrdiff_t);
1741 case FORMAT_TYPE_UBYTE
:
1742 num
= get_arg(unsigned char);
1744 case FORMAT_TYPE_BYTE
:
1745 num
= get_arg(signed char);
1747 case FORMAT_TYPE_USHORT
:
1748 num
= get_arg(unsigned short);
1750 case FORMAT_TYPE_SHORT
:
1751 num
= get_arg(short);
1753 case FORMAT_TYPE_UINT
:
1754 num
= get_arg(unsigned int);
1760 str
= number(str
, end
, num
, spec
);
1762 } /* switch(spec.type) */
1774 /* the trailing null byte doesn't count towards the total */
1777 EXPORT_SYMBOL_GPL(bstr_printf
);
1780 * bprintf - Parse a format string and place args' binary value in a buffer
1781 * @bin_buf: The buffer to place args' binary value
1782 * @size: The size of the buffer(by words(32bits), not characters)
1783 * @fmt: The format string to use
1784 * @...: Arguments for the format string
1786 * The function returns the number of words(u32) written
1789 int bprintf(u32
*bin_buf
, size_t size
, const char *fmt
, ...)
1794 va_start(args
, fmt
);
1795 ret
= vbin_printf(bin_buf
, size
, fmt
, args
);
1800 EXPORT_SYMBOL_GPL(bprintf
);
1802 #endif /* CONFIG_BINARY_PRINTF */
1805 * vsscanf - Unformat a buffer into a list of arguments
1806 * @buf: input buffer
1807 * @fmt: format of buffer
1810 int vsscanf(const char *buf
, const char *fmt
, va_list args
)
1812 const char *str
= buf
;
1821 while (*fmt
&& *str
) {
1822 /* skip any white space in format */
1823 /* white space in format matchs any amount of
1824 * white space, including none, in the input.
1826 if (isspace(*fmt
)) {
1827 fmt
= skip_spaces(++fmt
);
1828 str
= skip_spaces(str
);
1831 /* anything that is not a conversion must match exactly */
1832 if (*fmt
!= '%' && *fmt
) {
1833 if (*fmt
++ != *str
++)
1842 /* skip this conversion.
1843 * advance both strings to next white space
1846 while (!isspace(*fmt
) && *fmt
!= '%' && *fmt
)
1848 while (!isspace(*str
) && *str
)
1853 /* get field width */
1856 field_width
= skip_atoi(&fmt
);
1858 /* get conversion qualifier */
1860 if (*fmt
== 'h' || TOLOWER(*fmt
) == 'l' ||
1861 TOLOWER(*fmt
) == 'z') {
1863 if (unlikely(qualifier
== *fmt
)) {
1864 if (qualifier
== 'h') {
1867 } else if (qualifier
== 'l') {
1883 char *s
= (char *)va_arg(args
, char*);
1884 if (field_width
== -1)
1888 } while (--field_width
> 0 && *str
);
1894 char *s
= (char *)va_arg(args
, char *);
1895 if (field_width
== -1)
1896 field_width
= SHRT_MAX
;
1897 /* first, skip leading white space in buffer */
1898 str
= skip_spaces(str
);
1900 /* now copy until next white space */
1901 while (*str
&& !isspace(*str
) && field_width
--)
1908 /* return number of characters read so far */
1910 int *i
= (int *)va_arg(args
, int*);
1928 /* looking for '%' in str */
1933 /* invalid format; stop here */
1937 /* have some sort of integer conversion.
1938 * first, skip white space in buffer.
1940 str
= skip_spaces(str
);
1943 if (is_sign
&& digit
== '-')
1947 || (base
== 16 && !isxdigit(digit
))
1948 || (base
== 10 && !isdigit(digit
))
1949 || (base
== 8 && (!isdigit(digit
) || digit
> '7'))
1950 || (base
== 0 && !isdigit(digit
)))
1953 switch (qualifier
) {
1954 case 'H': /* that's 'hh' in format */
1956 signed char *s
= (signed char *)va_arg(args
, signed char *);
1957 *s
= (signed char)simple_strtol(str
, &next
, base
);
1959 unsigned char *s
= (unsigned char *)va_arg(args
, unsigned char *);
1960 *s
= (unsigned char)simple_strtoul(str
, &next
, base
);
1965 short *s
= (short *)va_arg(args
, short *);
1966 *s
= (short)simple_strtol(str
, &next
, base
);
1968 unsigned short *s
= (unsigned short *)va_arg(args
, unsigned short *);
1969 *s
= (unsigned short)simple_strtoul(str
, &next
, base
);
1974 long *l
= (long *)va_arg(args
, long *);
1975 *l
= simple_strtol(str
, &next
, base
);
1977 unsigned long *l
= (unsigned long *)va_arg(args
, unsigned long *);
1978 *l
= simple_strtoul(str
, &next
, base
);
1983 long long *l
= (long long *)va_arg(args
, long long *);
1984 *l
= simple_strtoll(str
, &next
, base
);
1986 unsigned long long *l
= (unsigned long long *)va_arg(args
, unsigned long long *);
1987 *l
= simple_strtoull(str
, &next
, base
);
1993 size_t *s
= (size_t *)va_arg(args
, size_t *);
1994 *s
= (size_t)simple_strtoul(str
, &next
, base
);
1999 int *i
= (int *)va_arg(args
, int *);
2000 *i
= (int)simple_strtol(str
, &next
, base
);
2002 unsigned int *i
= (unsigned int *)va_arg(args
, unsigned int*);
2003 *i
= (unsigned int)simple_strtoul(str
, &next
, base
);
2015 * Now we've come all the way through so either the input string or the
2016 * format ended. In the former case, there can be a %n at the current
2017 * position in the format that needs to be filled.
2019 if (*fmt
== '%' && *(fmt
+ 1) == 'n') {
2020 int *p
= (int *)va_arg(args
, int *);
2026 EXPORT_SYMBOL(vsscanf
);
2029 * sscanf - Unformat a buffer into a list of arguments
2030 * @buf: input buffer
2031 * @fmt: formatting of buffer
2032 * @...: resulting arguments
2034 int sscanf(const char *buf
, const char *fmt
, ...)
2039 va_start(args
, fmt
);
2040 i
= vsscanf(buf
, fmt
, args
);
2045 EXPORT_SYMBOL(sscanf
);
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