]>
git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - lib/vsprintf.c
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
);
123 * strict_strtoul - convert a string to an unsigned long strictly
124 * @cp: The string to be converted
125 * @base: The number base to use
126 * @res: The converted result value
128 * strict_strtoul converts a string to an unsigned long only if the
129 * string is really an unsigned long string, any string containing
130 * any invalid char at the tail will be rejected and -EINVAL is returned,
131 * only a newline char at the tail is acceptible because people generally
132 * change a module parameter in the following way:
134 * echo 1024 > /sys/module/e1000/parameters/copybreak
136 * echo will append a newline to the tail.
138 * It returns 0 if conversion is successful and *res is set to the converted
139 * value, otherwise it returns -EINVAL and *res is set to 0.
141 * simple_strtoul just ignores the successive invalid characters and
142 * return the converted value of prefix part of the string.
144 int strict_strtoul(const char *cp
, unsigned int base
, unsigned long *res
)
155 val
= simple_strtoul(cp
, &tail
, base
);
159 if ((*tail
== '\0') ||
160 ((len
== (size_t)(tail
- cp
) + 1) && (*tail
== '\n'))) {
167 EXPORT_SYMBOL(strict_strtoul
);
170 * strict_strtol - convert a string to a long strictly
171 * @cp: The string to be converted
172 * @base: The number base to use
173 * @res: The converted result value
175 * strict_strtol is similiar to strict_strtoul, but it allows the first
176 * character of a string is '-'.
178 * It returns 0 if conversion is successful and *res is set to the converted
179 * value, otherwise it returns -EINVAL and *res is set to 0.
181 int strict_strtol(const char *cp
, unsigned int base
, long *res
)
185 ret
= strict_strtoul(cp
+ 1, base
, (unsigned long *)res
);
189 ret
= strict_strtoul(cp
, base
, (unsigned long *)res
);
194 EXPORT_SYMBOL(strict_strtol
);
197 * strict_strtoull - convert a string to an unsigned long long strictly
198 * @cp: The string to be converted
199 * @base: The number base to use
200 * @res: The converted result value
202 * strict_strtoull converts a string to an unsigned long long only if the
203 * string is really an unsigned long long string, any string containing
204 * any invalid char at the tail will be rejected and -EINVAL is returned,
205 * only a newline char at the tail is acceptible because people generally
206 * change a module parameter in the following way:
208 * echo 1024 > /sys/module/e1000/parameters/copybreak
210 * echo will append a newline to the tail of the string.
212 * It returns 0 if conversion is successful and *res is set to the converted
213 * value, otherwise it returns -EINVAL and *res is set to 0.
215 * simple_strtoull just ignores the successive invalid characters and
216 * return the converted value of prefix part of the string.
218 int strict_strtoull(const char *cp
, unsigned int base
, unsigned long long *res
)
221 unsigned long long val
;
229 val
= simple_strtoull(cp
, &tail
, base
);
232 if ((*tail
== '\0') ||
233 ((len
== (size_t)(tail
- cp
) + 1) && (*tail
== '\n'))) {
240 EXPORT_SYMBOL(strict_strtoull
);
243 * strict_strtoll - convert a string to a long long strictly
244 * @cp: The string to be converted
245 * @base: The number base to use
246 * @res: The converted result value
248 * strict_strtoll is similiar to strict_strtoull, but it allows the first
249 * character of a string is '-'.
251 * It returns 0 if conversion is successful and *res is set to the converted
252 * value, otherwise it returns -EINVAL and *res is set to 0.
254 int strict_strtoll(const char *cp
, unsigned int base
, long long *res
)
258 ret
= strict_strtoull(cp
+ 1, base
, (unsigned long long *)res
);
262 ret
= strict_strtoull(cp
, base
, (unsigned long long *)res
);
267 EXPORT_SYMBOL(strict_strtoll
);
269 static int skip_atoi(const char **s
)
274 i
= i
*10 + *((*s
)++) - '0';
279 /* Decimal conversion is by far the most typical, and is used
280 * for /proc and /sys data. This directly impacts e.g. top performance
281 * with many processes running. We optimize it for speed
283 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
284 * (with permission from the author, Douglas W. Jones). */
286 /* Formats correctly any integer in [0,99999].
287 * Outputs from one to five digits depending on input.
288 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
289 static char *put_dec_trunc(char *buf
, unsigned q
)
291 unsigned d3
, d2
, d1
, d0
;
296 d0
= 6*(d3
+ d2
+ d1
) + (q
& 0xf);
297 q
= (d0
* 0xcd) >> 11;
299 *buf
++ = d0
+ '0'; /* least significant digit */
300 d1
= q
+ 9*d3
+ 5*d2
+ d1
;
302 q
= (d1
* 0xcd) >> 11;
304 *buf
++ = d1
+ '0'; /* next digit */
307 if ((d2
!= 0) || (d3
!= 0)) {
310 *buf
++ = d2
+ '0'; /* next digit */
314 q
= (d3
* 0xcd) >> 11;
316 *buf
++ = d3
+ '0'; /* next digit */
318 *buf
++ = q
+ '0'; /* most sign. digit */
325 /* Same with if's removed. Always emits five digits */
326 static char *put_dec_full(char *buf
, unsigned q
)
328 /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
329 /* but anyway, gcc produces better code with full-sized ints */
330 unsigned d3
, d2
, d1
, d0
;
336 * Possible ways to approx. divide by 10
337 * gcc -O2 replaces multiply with shifts and adds
338 * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
339 * (x * 0x67) >> 10: 1100111
340 * (x * 0x34) >> 9: 110100 - same
341 * (x * 0x1a) >> 8: 11010 - same
342 * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
344 d0
= 6*(d3
+ d2
+ d1
) + (q
& 0xf);
345 q
= (d0
* 0xcd) >> 11;
348 d1
= q
+ 9*d3
+ 5*d2
+ d1
;
349 q
= (d1
* 0xcd) >> 11;
359 q
= (d3
* 0xcd) >> 11; /* - shorter code */
360 /* q = (d3 * 0x67) >> 10; - would also work */
367 /* No inlining helps gcc to use registers better */
368 static noinline
char *put_dec(char *buf
, unsigned long long num
)
373 return put_dec_trunc(buf
, num
);
374 rem
= do_div(num
, 100000);
375 buf
= put_dec_full(buf
, rem
);
379 #define ZEROPAD 1 /* pad with zero */
380 #define SIGN 2 /* unsigned/signed long */
381 #define PLUS 4 /* show plus */
382 #define SPACE 8 /* space if plus */
383 #define LEFT 16 /* left justified */
384 #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
385 #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
388 FORMAT_TYPE_NONE
, /* Just a string part */
390 FORMAT_TYPE_PRECISION
,
394 FORMAT_TYPE_PERCENT_CHAR
,
396 FORMAT_TYPE_LONG_LONG
,
412 s16 field_width
; /* width of output field */
413 u8 flags
; /* flags to number() */
415 s8 precision
; /* # of digits/chars */
419 static 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 char *string(char *buf
, char *end
, const char *s
, struct printf_spec spec
)
543 if ((unsigned long)s
< PAGE_SIZE
)
546 len
= strnlen(s
, spec
.precision
);
548 if (!(spec
.flags
& LEFT
)) {
549 while (len
< spec
.field_width
--) {
555 for (i
= 0; i
< len
; ++i
) {
560 while (len
< spec
.field_width
--) {
569 static char *symbol_string(char *buf
, char *end
, void *ptr
,
570 struct printf_spec spec
, char ext
)
572 unsigned long value
= (unsigned long) ptr
;
573 #ifdef CONFIG_KALLSYMS
574 char sym
[KSYM_SYMBOL_LEN
];
575 if (ext
!= 'f' && ext
!= 's')
576 sprint_symbol(sym
, value
);
578 kallsyms_lookup(value
, NULL
, NULL
, NULL
, sym
);
580 return string(buf
, end
, sym
, spec
);
582 spec
.field_width
= 2 * sizeof(void *);
583 spec
.flags
|= SPECIAL
| SMALL
| ZEROPAD
;
586 return number(buf
, end
, value
, spec
);
590 static char *resource_string(char *buf
, char *end
, struct resource
*res
,
591 struct printf_spec spec
, const char *fmt
)
593 #ifndef IO_RSRC_PRINTK_SIZE
594 #define IO_RSRC_PRINTK_SIZE 6
597 #ifndef MEM_RSRC_PRINTK_SIZE
598 #define MEM_RSRC_PRINTK_SIZE 10
600 static const struct printf_spec io_spec
= {
602 .field_width
= IO_RSRC_PRINTK_SIZE
,
604 .flags
= SPECIAL
| SMALL
| ZEROPAD
,
606 static const struct printf_spec mem_spec
= {
608 .field_width
= MEM_RSRC_PRINTK_SIZE
,
610 .flags
= SPECIAL
| SMALL
| ZEROPAD
,
612 static const struct printf_spec bus_spec
= {
616 .flags
= SMALL
| ZEROPAD
,
618 static const struct printf_spec dec_spec
= {
623 static const struct printf_spec str_spec
= {
628 static const struct printf_spec flag_spec
= {
631 .flags
= SPECIAL
| SMALL
,
634 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
635 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
636 #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
637 #define FLAG_BUF_SIZE (2 * sizeof(res->flags))
638 #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
639 #define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
640 char sym
[max(2*RSRC_BUF_SIZE
+ DECODED_BUF_SIZE
,
641 2*RSRC_BUF_SIZE
+ FLAG_BUF_SIZE
+ RAW_BUF_SIZE
)];
643 char *p
= sym
, *pend
= sym
+ sizeof(sym
);
644 int decode
= (fmt
[0] == 'R') ? 1 : 0;
645 const struct printf_spec
*specp
;
648 if (res
->flags
& IORESOURCE_IO
) {
649 p
= string(p
, pend
, "io ", str_spec
);
651 } else if (res
->flags
& IORESOURCE_MEM
) {
652 p
= string(p
, pend
, "mem ", str_spec
);
654 } else if (res
->flags
& IORESOURCE_IRQ
) {
655 p
= string(p
, pend
, "irq ", str_spec
);
657 } else if (res
->flags
& IORESOURCE_DMA
) {
658 p
= string(p
, pend
, "dma ", str_spec
);
660 } else if (res
->flags
& IORESOURCE_BUS
) {
661 p
= string(p
, pend
, "bus ", str_spec
);
664 p
= string(p
, pend
, "??? ", str_spec
);
668 p
= number(p
, pend
, res
->start
, *specp
);
669 if (res
->start
!= res
->end
) {
671 p
= number(p
, pend
, res
->end
, *specp
);
674 if (res
->flags
& IORESOURCE_MEM_64
)
675 p
= string(p
, pend
, " 64bit", str_spec
);
676 if (res
->flags
& IORESOURCE_PREFETCH
)
677 p
= string(p
, pend
, " pref", str_spec
);
678 if (res
->flags
& IORESOURCE_WINDOW
)
679 p
= string(p
, pend
, " window", str_spec
);
680 if (res
->flags
& IORESOURCE_DISABLED
)
681 p
= string(p
, pend
, " disabled", str_spec
);
683 p
= string(p
, pend
, " flags ", str_spec
);
684 p
= number(p
, pend
, res
->flags
, flag_spec
);
689 return string(buf
, end
, sym
, spec
);
692 static char *mac_address_string(char *buf
, char *end
, u8
*addr
,
693 struct printf_spec spec
, const char *fmt
)
695 char mac_addr
[sizeof("xx:xx:xx:xx:xx:xx")];
700 if (fmt
[1] == 'F') { /* FDDI canonical format */
706 for (i
= 0; i
< 6; i
++) {
707 p
= pack_hex_byte(p
, addr
[i
]);
708 if (fmt
[0] == 'M' && i
!= 5)
713 return string(buf
, end
, mac_addr
, spec
);
716 static char *ip4_string(char *p
, const u8
*addr
, const char *fmt
)
719 bool leading_zeros
= (fmt
[0] == 'i');
744 for (i
= 0; i
< 4; i
++) {
745 char temp
[3]; /* hold each IP quad in reverse order */
746 int digits
= put_dec_trunc(temp
, addr
[index
]) - temp
;
753 /* reverse the digits in the quad */
765 static char *ip6_compressed_string(char *p
, const char *addr
)
768 unsigned char zerolength
[8];
773 bool needcolon
= false;
777 memcpy(&in6
, addr
, sizeof(struct in6_addr
));
779 useIPv4
= ipv6_addr_v4mapped(&in6
) || ipv6_addr_is_isatap(&in6
);
781 memset(zerolength
, 0, sizeof(zerolength
));
788 /* find position of longest 0 run */
789 for (i
= 0; i
< range
; i
++) {
790 for (j
= i
; j
< range
; j
++) {
791 if (in6
.s6_addr16
[j
] != 0)
796 for (i
= 0; i
< range
; i
++) {
797 if (zerolength
[i
] > longest
) {
798 longest
= zerolength
[i
];
804 for (i
= 0; i
< range
; i
++) {
806 if (needcolon
|| i
== 0)
817 /* hex u16 without leading 0s */
818 word
= ntohs(in6
.s6_addr16
[i
]);
823 p
= pack_hex_byte(p
, hi
);
825 *p
++ = hex_asc_lo(hi
);
826 p
= pack_hex_byte(p
, lo
);
829 p
= pack_hex_byte(p
, lo
);
831 *p
++ = hex_asc_lo(lo
);
838 p
= ip4_string(p
, &in6
.s6_addr
[12], "I4");
845 static char *ip6_string(char *p
, const char *addr
, const char *fmt
)
849 for (i
= 0; i
< 8; i
++) {
850 p
= pack_hex_byte(p
, *addr
++);
851 p
= pack_hex_byte(p
, *addr
++);
852 if (fmt
[0] == 'I' && i
!= 7)
860 static char *ip6_addr_string(char *buf
, char *end
, const u8
*addr
,
861 struct printf_spec spec
, const char *fmt
)
863 char ip6_addr
[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
865 if (fmt
[0] == 'I' && fmt
[2] == 'c')
866 ip6_compressed_string(ip6_addr
, addr
);
868 ip6_string(ip6_addr
, addr
, fmt
);
870 return string(buf
, end
, ip6_addr
, spec
);
873 static char *ip4_addr_string(char *buf
, char *end
, const u8
*addr
,
874 struct printf_spec spec
, const char *fmt
)
876 char ip4_addr
[sizeof("255.255.255.255")];
878 ip4_string(ip4_addr
, addr
, fmt
);
880 return string(buf
, end
, ip4_addr
, spec
);
883 static char *uuid_string(char *buf
, char *end
, const u8
*addr
,
884 struct printf_spec spec
, const char *fmt
)
886 char uuid
[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")];
889 static const u8 be
[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
890 static const u8 le
[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15};
891 const u8
*index
= be
;
896 uc
= true; /* fall-through */
905 for (i
= 0; i
< 16; i
++) {
906 p
= pack_hex_byte(p
, addr
[index
[i
]]);
926 return string(buf
, end
, uuid
, spec
);
930 * Show a '%p' thing. A kernel extension is that the '%p' is followed
931 * by an extra set of alphanumeric characters that are extended format
934 * Right now we handle:
936 * - 'F' For symbolic function descriptor pointers with offset
937 * - 'f' For simple symbolic function names without offset
938 * - 'S' For symbolic direct pointers with offset
939 * - 's' For symbolic direct pointers without offset
940 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
941 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
942 * - 'M' For a 6-byte MAC address, it prints the address in the
943 * usual colon-separated hex notation
944 * - 'm' For a 6-byte MAC address, it prints the hex address without colons
945 * - 'MF' For a 6-byte MAC FDDI address, it prints the address
946 * with a dash-separated hex notation
947 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
948 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
949 * IPv6 uses colon separated network-order 16 bit hex with leading 0's
950 * - 'i' [46] for 'raw' IPv4/IPv6 addresses
951 * IPv6 omits the colons (01020304...0f)
952 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
953 * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order
954 * - 'I6c' for IPv6 addresses printed as specified by
955 * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00
956 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
957 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
958 * Options for %pU are:
959 * b big endian lower case hex (default)
960 * B big endian UPPER case hex
961 * l little endian lower case hex
962 * L little endian UPPER case hex
963 * big endian output byte order is:
964 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
965 * little endian output byte order is:
966 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
968 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
969 * function pointers are really function descriptors, which contain a
970 * pointer to the real address.
972 static char *pointer(const char *fmt
, char *buf
, char *end
, void *ptr
,
973 struct printf_spec spec
)
976 return string(buf
, end
, "(null)", spec
);
981 ptr
= dereference_function_descriptor(ptr
);
985 return symbol_string(buf
, end
, ptr
, spec
, *fmt
);
988 return resource_string(buf
, end
, ptr
, spec
, fmt
);
989 case 'M': /* Colon separated: 00:01:02:03:04:05 */
990 case 'm': /* Contiguous: 000102030405 */
991 /* [mM]F (FDDI, bit reversed) */
992 return mac_address_string(buf
, end
, ptr
, spec
, fmt
);
993 case 'I': /* Formatted IP supported
995 * 6: 0001:0203:...:0708
996 * 6c: 1::708 or 1::1.2.3.4
998 case 'i': /* Contiguous:
1004 return ip6_addr_string(buf
, end
, ptr
, spec
, fmt
);
1006 return ip4_addr_string(buf
, end
, ptr
, spec
, fmt
);
1010 return uuid_string(buf
, end
, ptr
, spec
, fmt
);
1012 spec
.flags
|= SMALL
;
1013 if (spec
.field_width
== -1) {
1014 spec
.field_width
= 2*sizeof(void *);
1015 spec
.flags
|= ZEROPAD
;
1019 return number(buf
, end
, (unsigned long) ptr
, spec
);
1023 * Helper function to decode printf style format.
1024 * Each call decode a token from the format and return the
1025 * number of characters read (or likely the delta where it wants
1026 * to go on the next call).
1027 * The decoded token is returned through the parameters
1029 * 'h', 'l', or 'L' for integer fields
1030 * 'z' support added 23/7/1999 S.H.
1031 * 'z' changed to 'Z' --davidm 1/25/99
1032 * 't' added for ptrdiff_t
1034 * @fmt: the format string
1035 * @type of the token returned
1036 * @flags: various flags such as +, -, # tokens..
1037 * @field_width: overwritten width
1038 * @base: base of the number (octal, hex, ...)
1039 * @precision: precision of a number
1040 * @qualifier: qualifier of a number (long, size_t, ...)
1042 static int format_decode(const char *fmt
, struct printf_spec
*spec
)
1044 const char *start
= fmt
;
1046 /* we finished early by reading the field width */
1047 if (spec
->type
== FORMAT_TYPE_WIDTH
) {
1048 if (spec
->field_width
< 0) {
1049 spec
->field_width
= -spec
->field_width
;
1050 spec
->flags
|= LEFT
;
1052 spec
->type
= FORMAT_TYPE_NONE
;
1056 /* we finished early by reading the precision */
1057 if (spec
->type
== FORMAT_TYPE_PRECISION
) {
1058 if (spec
->precision
< 0)
1059 spec
->precision
= 0;
1061 spec
->type
= FORMAT_TYPE_NONE
;
1066 spec
->type
= FORMAT_TYPE_NONE
;
1068 for (; *fmt
; ++fmt
) {
1073 /* Return the current non-format string */
1074 if (fmt
!= start
|| !*fmt
)
1080 while (1) { /* this also skips first '%' */
1086 case '-': spec
->flags
|= LEFT
; break;
1087 case '+': spec
->flags
|= PLUS
; break;
1088 case ' ': spec
->flags
|= SPACE
; break;
1089 case '#': spec
->flags
|= SPECIAL
; break;
1090 case '0': spec
->flags
|= ZEROPAD
; break;
1091 default: found
= false;
1098 /* get field width */
1099 spec
->field_width
= -1;
1102 spec
->field_width
= skip_atoi(&fmt
);
1103 else if (*fmt
== '*') {
1104 /* it's the next argument */
1105 spec
->type
= FORMAT_TYPE_WIDTH
;
1106 return ++fmt
- start
;
1110 /* get the precision */
1111 spec
->precision
= -1;
1114 if (isdigit(*fmt
)) {
1115 spec
->precision
= skip_atoi(&fmt
);
1116 if (spec
->precision
< 0)
1117 spec
->precision
= 0;
1118 } else if (*fmt
== '*') {
1119 /* it's the next argument */
1120 spec
->type
= FORMAT_TYPE_PRECISION
;
1121 return ++fmt
- start
;
1126 /* get the conversion qualifier */
1127 spec
->qualifier
= -1;
1128 if (*fmt
== 'h' || TOLOWER(*fmt
) == 'l' ||
1129 TOLOWER(*fmt
) == 'z' || *fmt
== 't') {
1130 spec
->qualifier
= *fmt
++;
1131 if (unlikely(spec
->qualifier
== *fmt
)) {
1132 if (spec
->qualifier
== 'l') {
1133 spec
->qualifier
= 'L';
1135 } else if (spec
->qualifier
== 'h') {
1136 spec
->qualifier
= 'H';
1146 spec
->type
= FORMAT_TYPE_CHAR
;
1147 return ++fmt
- start
;
1150 spec
->type
= FORMAT_TYPE_STR
;
1151 return ++fmt
- start
;
1154 spec
->type
= FORMAT_TYPE_PTR
;
1159 spec
->type
= FORMAT_TYPE_NRCHARS
;
1160 return ++fmt
- start
;
1163 spec
->type
= FORMAT_TYPE_PERCENT_CHAR
;
1164 return ++fmt
- start
;
1166 /* integer number formats - set up the flags and "break" */
1172 spec
->flags
|= SMALL
;
1180 spec
->flags
|= SIGN
;
1185 spec
->type
= FORMAT_TYPE_INVALID
;
1189 if (spec
->qualifier
== 'L')
1190 spec
->type
= FORMAT_TYPE_LONG_LONG
;
1191 else if (spec
->qualifier
== 'l') {
1192 if (spec
->flags
& SIGN
)
1193 spec
->type
= FORMAT_TYPE_LONG
;
1195 spec
->type
= FORMAT_TYPE_ULONG
;
1196 } else if (TOLOWER(spec
->qualifier
) == 'z') {
1197 spec
->type
= FORMAT_TYPE_SIZE_T
;
1198 } else if (spec
->qualifier
== 't') {
1199 spec
->type
= FORMAT_TYPE_PTRDIFF
;
1200 } else if (spec
->qualifier
== 'H') {
1201 if (spec
->flags
& SIGN
)
1202 spec
->type
= FORMAT_TYPE_BYTE
;
1204 spec
->type
= FORMAT_TYPE_UBYTE
;
1205 } else if (spec
->qualifier
== 'h') {
1206 if (spec
->flags
& SIGN
)
1207 spec
->type
= FORMAT_TYPE_SHORT
;
1209 spec
->type
= FORMAT_TYPE_USHORT
;
1211 if (spec
->flags
& SIGN
)
1212 spec
->type
= FORMAT_TYPE_INT
;
1214 spec
->type
= FORMAT_TYPE_UINT
;
1217 return ++fmt
- start
;
1221 * vsnprintf - Format a string and place it in a buffer
1222 * @buf: The buffer to place the result into
1223 * @size: The size of the buffer, including the trailing null space
1224 * @fmt: The format string to use
1225 * @args: Arguments for the format string
1227 * This function follows C99 vsnprintf, but has some extensions:
1228 * %pS output the name of a text symbol with offset
1229 * %ps output the name of a text symbol without offset
1230 * %pF output the name of a function pointer with its offset
1231 * %pf output the name of a function pointer without its offset
1232 * %pR output the address range in a struct resource with decoded flags
1233 * %pr output the address range in a struct resource with raw flags
1234 * %pM output a 6-byte MAC address with colons
1235 * %pm output a 6-byte MAC address without colons
1236 * %pI4 print an IPv4 address without leading zeros
1237 * %pi4 print an IPv4 address with leading zeros
1238 * %pI6 print an IPv6 address with colons
1239 * %pi6 print an IPv6 address without colons
1240 * %pI6c print an IPv6 address as specified by
1241 * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00
1242 * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
1246 * The return value is the number of characters which would
1247 * be generated for the given input, excluding the trailing
1248 * '\0', as per ISO C99. If you want to have the exact
1249 * number of characters written into @buf as return value
1250 * (not including the trailing '\0'), use vscnprintf(). If the
1251 * return is greater than or equal to @size, the resulting
1252 * string is truncated.
1254 * Call this function if you are already dealing with a va_list.
1255 * You probably want snprintf() instead.
1257 int vsnprintf(char *buf
, size_t size
, const char *fmt
, va_list args
)
1259 unsigned long long num
;
1261 struct printf_spec spec
= {0};
1263 /* Reject out-of-range values early. Large positive sizes are
1264 used for unknown buffer sizes. */
1265 if (WARN_ON_ONCE((int) size
< 0))
1271 /* Make sure end is always >= buf */
1278 const char *old_fmt
= fmt
;
1279 int read
= format_decode(fmt
, &spec
);
1283 switch (spec
.type
) {
1284 case FORMAT_TYPE_NONE
: {
1287 if (copy
> end
- str
)
1289 memcpy(str
, old_fmt
, copy
);
1295 case FORMAT_TYPE_WIDTH
:
1296 spec
.field_width
= va_arg(args
, int);
1299 case FORMAT_TYPE_PRECISION
:
1300 spec
.precision
= va_arg(args
, int);
1303 case FORMAT_TYPE_CHAR
: {
1306 if (!(spec
.flags
& LEFT
)) {
1307 while (--spec
.field_width
> 0) {
1314 c
= (unsigned char) va_arg(args
, int);
1318 while (--spec
.field_width
> 0) {
1326 case FORMAT_TYPE_STR
:
1327 str
= string(str
, end
, va_arg(args
, char *), spec
);
1330 case FORMAT_TYPE_PTR
:
1331 str
= pointer(fmt
+1, str
, end
, va_arg(args
, void *),
1333 while (isalnum(*fmt
))
1337 case FORMAT_TYPE_PERCENT_CHAR
:
1343 case FORMAT_TYPE_INVALID
:
1349 case FORMAT_TYPE_NRCHARS
: {
1350 u8 qualifier
= spec
.qualifier
;
1352 if (qualifier
== 'l') {
1353 long *ip
= va_arg(args
, long *);
1355 } else if (TOLOWER(qualifier
) == 'z') {
1356 size_t *ip
= va_arg(args
, size_t *);
1359 int *ip
= va_arg(args
, int *);
1366 switch (spec
.type
) {
1367 case FORMAT_TYPE_LONG_LONG
:
1368 num
= va_arg(args
, long long);
1370 case FORMAT_TYPE_ULONG
:
1371 num
= va_arg(args
, unsigned long);
1373 case FORMAT_TYPE_LONG
:
1374 num
= va_arg(args
, long);
1376 case FORMAT_TYPE_SIZE_T
:
1377 num
= va_arg(args
, size_t);
1379 case FORMAT_TYPE_PTRDIFF
:
1380 num
= va_arg(args
, ptrdiff_t);
1382 case FORMAT_TYPE_UBYTE
:
1383 num
= (unsigned char) va_arg(args
, int);
1385 case FORMAT_TYPE_BYTE
:
1386 num
= (signed char) va_arg(args
, int);
1388 case FORMAT_TYPE_USHORT
:
1389 num
= (unsigned short) va_arg(args
, int);
1391 case FORMAT_TYPE_SHORT
:
1392 num
= (short) va_arg(args
, int);
1394 case FORMAT_TYPE_INT
:
1395 num
= (int) va_arg(args
, int);
1398 num
= va_arg(args
, unsigned int);
1401 str
= number(str
, end
, num
, spec
);
1412 /* the trailing null byte doesn't count towards the total */
1416 EXPORT_SYMBOL(vsnprintf
);
1419 * vscnprintf - Format a string and place it in a buffer
1420 * @buf: The buffer to place the result into
1421 * @size: The size of the buffer, including the trailing null space
1422 * @fmt: The format string to use
1423 * @args: Arguments for the format string
1425 * The return value is the number of characters which have been written into
1426 * the @buf not including the trailing '\0'. If @size is <= 0 the function
1429 * Call this function if you are already dealing with a va_list.
1430 * You probably want scnprintf() instead.
1432 * See the vsnprintf() documentation for format string extensions over C99.
1434 int vscnprintf(char *buf
, size_t size
, const char *fmt
, va_list args
)
1438 i
= vsnprintf(buf
, size
, fmt
, args
);
1440 return (i
>= size
) ? (size
- 1) : i
;
1442 EXPORT_SYMBOL(vscnprintf
);
1445 * snprintf - Format a string and place it in a buffer
1446 * @buf: The buffer to place the result into
1447 * @size: The size of the buffer, including the trailing null space
1448 * @fmt: The format string to use
1449 * @...: Arguments for the format string
1451 * The return value is the number of characters which would be
1452 * generated for the given input, excluding the trailing null,
1453 * as per ISO C99. If the return is greater than or equal to
1454 * @size, the resulting string is truncated.
1456 * See the vsnprintf() documentation for format string extensions over C99.
1458 int snprintf(char *buf
, size_t size
, const char *fmt
, ...)
1463 va_start(args
, fmt
);
1464 i
= vsnprintf(buf
, size
, fmt
, args
);
1469 EXPORT_SYMBOL(snprintf
);
1472 * scnprintf - Format a string and place it in a buffer
1473 * @buf: The buffer to place the result into
1474 * @size: The size of the buffer, including the trailing null space
1475 * @fmt: The format string to use
1476 * @...: Arguments for the format string
1478 * The return value is the number of characters written into @buf not including
1479 * the trailing '\0'. If @size is <= 0 the function returns 0.
1482 int scnprintf(char *buf
, size_t size
, const char *fmt
, ...)
1487 va_start(args
, fmt
);
1488 i
= vsnprintf(buf
, size
, fmt
, args
);
1491 return (i
>= size
) ? (size
- 1) : i
;
1493 EXPORT_SYMBOL(scnprintf
);
1496 * vsprintf - Format a string and place it in a buffer
1497 * @buf: The buffer to place the result into
1498 * @fmt: The format string to use
1499 * @args: Arguments for the format string
1501 * The function returns the number of characters written
1502 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
1505 * Call this function if you are already dealing with a va_list.
1506 * You probably want sprintf() instead.
1508 * See the vsnprintf() documentation for format string extensions over C99.
1510 int vsprintf(char *buf
, const char *fmt
, va_list args
)
1512 return vsnprintf(buf
, INT_MAX
, fmt
, args
);
1514 EXPORT_SYMBOL(vsprintf
);
1517 * sprintf - Format a string and place it in a buffer
1518 * @buf: The buffer to place the result into
1519 * @fmt: The format string to use
1520 * @...: Arguments for the format string
1522 * The function returns the number of characters written
1523 * into @buf. Use snprintf() or scnprintf() in order to avoid
1526 * See the vsnprintf() documentation for format string extensions over C99.
1528 int sprintf(char *buf
, const char *fmt
, ...)
1533 va_start(args
, fmt
);
1534 i
= vsnprintf(buf
, INT_MAX
, fmt
, args
);
1539 EXPORT_SYMBOL(sprintf
);
1541 #ifdef CONFIG_BINARY_PRINTF
1544 * vbin_printf() - VA arguments to binary data
1545 * bstr_printf() - Binary data to text string
1549 * vbin_printf - Parse a format string and place args' binary value in a buffer
1550 * @bin_buf: The buffer to place args' binary value
1551 * @size: The size of the buffer(by words(32bits), not characters)
1552 * @fmt: The format string to use
1553 * @args: Arguments for the format string
1555 * The format follows C99 vsnprintf, except %n is ignored, and its argument
1558 * The return value is the number of words(32bits) which would be generated for
1562 * If the return value is greater than @size, the resulting bin_buf is NOT
1563 * valid for bstr_printf().
1565 int vbin_printf(u32
*bin_buf
, size_t size
, const char *fmt
, va_list args
)
1567 struct printf_spec spec
= {0};
1570 str
= (char *)bin_buf
;
1571 end
= (char *)(bin_buf
+ size
);
1573 #define save_arg(type) \
1575 if (sizeof(type) == 8) { \
1576 unsigned long long value; \
1577 str = PTR_ALIGN(str, sizeof(u32)); \
1578 value = va_arg(args, unsigned long long); \
1579 if (str + sizeof(type) <= end) { \
1580 *(u32 *)str = *(u32 *)&value; \
1581 *(u32 *)(str + 4) = *((u32 *)&value + 1); \
1584 unsigned long value; \
1585 str = PTR_ALIGN(str, sizeof(type)); \
1586 value = va_arg(args, int); \
1587 if (str + sizeof(type) <= end) \
1588 *(typeof(type) *)str = (type)value; \
1590 str += sizeof(type); \
1594 int read
= format_decode(fmt
, &spec
);
1598 switch (spec
.type
) {
1599 case FORMAT_TYPE_NONE
:
1600 case FORMAT_TYPE_INVALID
:
1601 case FORMAT_TYPE_PERCENT_CHAR
:
1604 case FORMAT_TYPE_WIDTH
:
1605 case FORMAT_TYPE_PRECISION
:
1609 case FORMAT_TYPE_CHAR
:
1613 case FORMAT_TYPE_STR
: {
1614 const char *save_str
= va_arg(args
, char *);
1617 if ((unsigned long)save_str
> (unsigned long)-PAGE_SIZE
1618 || (unsigned long)save_str
< PAGE_SIZE
)
1619 save_str
= "(null)";
1620 len
= strlen(save_str
) + 1;
1621 if (str
+ len
< end
)
1622 memcpy(str
, save_str
, len
);
1627 case FORMAT_TYPE_PTR
:
1629 /* skip all alphanumeric pointer suffixes */
1630 while (isalnum(*fmt
))
1634 case FORMAT_TYPE_NRCHARS
: {
1635 /* skip %n 's argument */
1636 u8 qualifier
= spec
.qualifier
;
1638 if (qualifier
== 'l')
1639 skip_arg
= va_arg(args
, long *);
1640 else if (TOLOWER(qualifier
) == 'z')
1641 skip_arg
= va_arg(args
, size_t *);
1643 skip_arg
= va_arg(args
, int *);
1648 switch (spec
.type
) {
1650 case FORMAT_TYPE_LONG_LONG
:
1651 save_arg(long long);
1653 case FORMAT_TYPE_ULONG
:
1654 case FORMAT_TYPE_LONG
:
1655 save_arg(unsigned long);
1657 case FORMAT_TYPE_SIZE_T
:
1660 case FORMAT_TYPE_PTRDIFF
:
1661 save_arg(ptrdiff_t);
1663 case FORMAT_TYPE_UBYTE
:
1664 case FORMAT_TYPE_BYTE
:
1667 case FORMAT_TYPE_USHORT
:
1668 case FORMAT_TYPE_SHORT
:
1677 return (u32
*)(PTR_ALIGN(str
, sizeof(u32
))) - bin_buf
;
1680 EXPORT_SYMBOL_GPL(vbin_printf
);
1683 * bstr_printf - Format a string from binary arguments and place it in a buffer
1684 * @buf: The buffer to place the result into
1685 * @size: The size of the buffer, including the trailing null space
1686 * @fmt: The format string to use
1687 * @bin_buf: Binary arguments for the format string
1689 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
1690 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
1691 * a binary buffer that generated by vbin_printf.
1693 * The format follows C99 vsnprintf, but has some extensions:
1694 * see vsnprintf comment for details.
1696 * The return value is the number of characters which would
1697 * be generated for the given input, excluding the trailing
1698 * '\0', as per ISO C99. If you want to have the exact
1699 * number of characters written into @buf as return value
1700 * (not including the trailing '\0'), use vscnprintf(). If the
1701 * return is greater than or equal to @size, the resulting
1702 * string is truncated.
1704 int bstr_printf(char *buf
, size_t size
, const char *fmt
, const u32
*bin_buf
)
1706 struct printf_spec spec
= {0};
1708 const char *args
= (const char *)bin_buf
;
1710 if (WARN_ON_ONCE((int) size
< 0))
1716 #define get_arg(type) \
1718 typeof(type) value; \
1719 if (sizeof(type) == 8) { \
1720 args = PTR_ALIGN(args, sizeof(u32)); \
1721 *(u32 *)&value = *(u32 *)args; \
1722 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
1724 args = PTR_ALIGN(args, sizeof(type)); \
1725 value = *(typeof(type) *)args; \
1727 args += sizeof(type); \
1731 /* Make sure end is always >= buf */
1738 const char *old_fmt
= fmt
;
1739 int read
= format_decode(fmt
, &spec
);
1743 switch (spec
.type
) {
1744 case FORMAT_TYPE_NONE
: {
1747 if (copy
> end
- str
)
1749 memcpy(str
, old_fmt
, copy
);
1755 case FORMAT_TYPE_WIDTH
:
1756 spec
.field_width
= get_arg(int);
1759 case FORMAT_TYPE_PRECISION
:
1760 spec
.precision
= get_arg(int);
1763 case FORMAT_TYPE_CHAR
: {
1766 if (!(spec
.flags
& LEFT
)) {
1767 while (--spec
.field_width
> 0) {
1773 c
= (unsigned char) get_arg(char);
1777 while (--spec
.field_width
> 0) {
1785 case FORMAT_TYPE_STR
: {
1786 const char *str_arg
= args
;
1787 args
+= strlen(str_arg
) + 1;
1788 str
= string(str
, end
, (char *)str_arg
, spec
);
1792 case FORMAT_TYPE_PTR
:
1793 str
= pointer(fmt
+1, str
, end
, get_arg(void *), spec
);
1794 while (isalnum(*fmt
))
1798 case FORMAT_TYPE_PERCENT_CHAR
:
1799 case FORMAT_TYPE_INVALID
:
1805 case FORMAT_TYPE_NRCHARS
:
1810 unsigned long long num
;
1812 switch (spec
.type
) {
1814 case FORMAT_TYPE_LONG_LONG
:
1815 num
= get_arg(long long);
1817 case FORMAT_TYPE_ULONG
:
1818 case FORMAT_TYPE_LONG
:
1819 num
= get_arg(unsigned long);
1821 case FORMAT_TYPE_SIZE_T
:
1822 num
= get_arg(size_t);
1824 case FORMAT_TYPE_PTRDIFF
:
1825 num
= get_arg(ptrdiff_t);
1827 case FORMAT_TYPE_UBYTE
:
1828 num
= get_arg(unsigned char);
1830 case FORMAT_TYPE_BYTE
:
1831 num
= get_arg(signed char);
1833 case FORMAT_TYPE_USHORT
:
1834 num
= get_arg(unsigned short);
1836 case FORMAT_TYPE_SHORT
:
1837 num
= get_arg(short);
1839 case FORMAT_TYPE_UINT
:
1840 num
= get_arg(unsigned int);
1846 str
= number(str
, end
, num
, spec
);
1848 } /* switch(spec.type) */
1860 /* the trailing null byte doesn't count towards the total */
1863 EXPORT_SYMBOL_GPL(bstr_printf
);
1866 * bprintf - Parse a format string and place args' binary value in a buffer
1867 * @bin_buf: The buffer to place args' binary value
1868 * @size: The size of the buffer(by words(32bits), not characters)
1869 * @fmt: The format string to use
1870 * @...: Arguments for the format string
1872 * The function returns the number of words(u32) written
1875 int bprintf(u32
*bin_buf
, size_t size
, const char *fmt
, ...)
1880 va_start(args
, fmt
);
1881 ret
= vbin_printf(bin_buf
, size
, fmt
, args
);
1886 EXPORT_SYMBOL_GPL(bprintf
);
1888 #endif /* CONFIG_BINARY_PRINTF */
1891 * vsscanf - Unformat a buffer into a list of arguments
1892 * @buf: input buffer
1893 * @fmt: format of buffer
1896 int vsscanf(const char *buf
, const char *fmt
, va_list args
)
1898 const char *str
= buf
;
1907 while (*fmt
&& *str
) {
1908 /* skip any white space in format */
1909 /* white space in format matchs any amount of
1910 * white space, including none, in the input.
1912 if (isspace(*fmt
)) {
1913 fmt
= skip_spaces(++fmt
);
1914 str
= skip_spaces(str
);
1917 /* anything that is not a conversion must match exactly */
1918 if (*fmt
!= '%' && *fmt
) {
1919 if (*fmt
++ != *str
++)
1928 /* skip this conversion.
1929 * advance both strings to next white space
1932 while (!isspace(*fmt
) && *fmt
!= '%' && *fmt
)
1934 while (!isspace(*str
) && *str
)
1939 /* get field width */
1942 field_width
= skip_atoi(&fmt
);
1944 /* get conversion qualifier */
1946 if (*fmt
== 'h' || TOLOWER(*fmt
) == 'l' ||
1947 TOLOWER(*fmt
) == 'z') {
1949 if (unlikely(qualifier
== *fmt
)) {
1950 if (qualifier
== 'h') {
1953 } else if (qualifier
== 'l') {
1969 char *s
= (char *)va_arg(args
, char*);
1970 if (field_width
== -1)
1974 } while (--field_width
> 0 && *str
);
1980 char *s
= (char *)va_arg(args
, char *);
1981 if (field_width
== -1)
1982 field_width
= SHORT_MAX
;
1983 /* first, skip leading white space in buffer */
1984 str
= skip_spaces(str
);
1986 /* now copy until next white space */
1987 while (*str
&& !isspace(*str
) && field_width
--)
1994 /* return number of characters read so far */
1996 int *i
= (int *)va_arg(args
, int*);
2014 /* looking for '%' in str */
2019 /* invalid format; stop here */
2023 /* have some sort of integer conversion.
2024 * first, skip white space in buffer.
2026 str
= skip_spaces(str
);
2029 if (is_sign
&& digit
== '-')
2033 || (base
== 16 && !isxdigit(digit
))
2034 || (base
== 10 && !isdigit(digit
))
2035 || (base
== 8 && (!isdigit(digit
) || digit
> '7'))
2036 || (base
== 0 && !isdigit(digit
)))
2039 switch (qualifier
) {
2040 case 'H': /* that's 'hh' in format */
2042 signed char *s
= (signed char *)va_arg(args
, signed char *);
2043 *s
= (signed char)simple_strtol(str
, &next
, base
);
2045 unsigned char *s
= (unsigned char *)va_arg(args
, unsigned char *);
2046 *s
= (unsigned char)simple_strtoul(str
, &next
, base
);
2051 short *s
= (short *)va_arg(args
, short *);
2052 *s
= (short)simple_strtol(str
, &next
, base
);
2054 unsigned short *s
= (unsigned short *)va_arg(args
, unsigned short *);
2055 *s
= (unsigned short)simple_strtoul(str
, &next
, base
);
2060 long *l
= (long *)va_arg(args
, long *);
2061 *l
= simple_strtol(str
, &next
, base
);
2063 unsigned long *l
= (unsigned long *)va_arg(args
, unsigned long *);
2064 *l
= simple_strtoul(str
, &next
, base
);
2069 long long *l
= (long long *)va_arg(args
, long long *);
2070 *l
= simple_strtoll(str
, &next
, base
);
2072 unsigned long long *l
= (unsigned long long *)va_arg(args
, unsigned long long *);
2073 *l
= simple_strtoull(str
, &next
, base
);
2079 size_t *s
= (size_t *)va_arg(args
, size_t *);
2080 *s
= (size_t)simple_strtoul(str
, &next
, base
);
2085 int *i
= (int *)va_arg(args
, int *);
2086 *i
= (int)simple_strtol(str
, &next
, base
);
2088 unsigned int *i
= (unsigned int *)va_arg(args
, unsigned int*);
2089 *i
= (unsigned int)simple_strtoul(str
, &next
, base
);
2101 * Now we've come all the way through so either the input string or the
2102 * format ended. In the former case, there can be a %n at the current
2103 * position in the format that needs to be filled.
2105 if (*fmt
== '%' && *(fmt
+ 1) == 'n') {
2106 int *p
= (int *)va_arg(args
, int *);
2112 EXPORT_SYMBOL(vsscanf
);
2115 * sscanf - Unformat a buffer into a list of arguments
2116 * @buf: input buffer
2117 * @fmt: formatting of buffer
2118 * @...: resulting arguments
2120 int sscanf(const char *buf
, const char *fmt
, ...)
2125 va_start(args
, fmt
);
2126 i
= vsscanf(buf
, fmt
, args
);
2131 EXPORT_SYMBOL(sscanf
);