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>
29 #include <asm/page.h> /* for PAGE_SIZE */
30 #include <asm/div64.h>
31 #include <asm/sections.h> /* for dereference_function_descriptor() */
33 /* Works only for digits and letters, but small and fast */
34 #define TOLOWER(x) ((x) | 0x20)
36 static unsigned int simple_guess_base(const char *cp)
39 if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2]))
49 * simple_strtoul - convert a string to an unsigned long
50 * @cp: The start of the string
51 * @endp: A pointer to the end of the parsed string will be placed here
52 * @base: The number base to use
54 unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
56 unsigned long result = 0;
59 base = simple_guess_base(cp);
61 if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x')
64 while (isxdigit(*cp)) {
67 value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10;
70 result = result * base + value;
78 EXPORT_SYMBOL(simple_strtoul);
81 * simple_strtol - convert a string to a signed long
82 * @cp: The start of the string
83 * @endp: A pointer to the end of the parsed string will be placed here
84 * @base: The number base to use
86 long simple_strtol(const char *cp, char **endp, unsigned int base)
89 return -simple_strtoul(cp + 1, endp, base);
90 return simple_strtoul(cp, endp, base);
92 EXPORT_SYMBOL(simple_strtol);
95 * simple_strtoull - convert a string to an unsigned long long
96 * @cp: The start of the string
97 * @endp: A pointer to the end of the parsed string will be placed here
98 * @base: The number base to use
100 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
102 unsigned long long result = 0;
105 base = simple_guess_base(cp);
107 if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x')
110 while (isxdigit(*cp)) {
113 value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10;
116 result = result * base + value;
124 EXPORT_SYMBOL(simple_strtoull);
127 * simple_strtoll - convert a string to a signed long long
128 * @cp: The start of the string
129 * @endp: A pointer to the end of the parsed string will be placed here
130 * @base: The number base to use
132 long long simple_strtoll(const char *cp, char **endp, unsigned int base)
135 return -simple_strtoull(cp + 1, endp, base);
136 return simple_strtoull(cp, endp, base);
140 * strict_strtoul - convert a string to an unsigned long strictly
141 * @cp: The string to be converted
142 * @base: The number base to use
143 * @res: The converted result value
145 * strict_strtoul converts a string to an unsigned long only if the
146 * string is really an unsigned long string, any string containing
147 * any invalid char at the tail will be rejected and -EINVAL is returned,
148 * only a newline char at the tail is acceptible because people generally
149 * change a module parameter in the following way:
151 * echo 1024 > /sys/module/e1000/parameters/copybreak
153 * echo will append a newline to the tail.
155 * It returns 0 if conversion is successful and *res is set to the converted
156 * value, otherwise it returns -EINVAL and *res is set to 0.
158 * simple_strtoul just ignores the successive invalid characters and
159 * return the converted value of prefix part of the string.
161 int strict_strtoul(const char *cp, unsigned int base, unsigned long *res)
172 val = simple_strtoul(cp, &tail, base);
175 if ((*tail == '\0') ||
176 ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {
183 EXPORT_SYMBOL(strict_strtoul);
186 * strict_strtol - convert a string to a long strictly
187 * @cp: The string to be converted
188 * @base: The number base to use
189 * @res: The converted result value
191 * strict_strtol is similiar to strict_strtoul, but it allows the first
192 * character of a string is '-'.
194 * It returns 0 if conversion is successful and *res is set to the converted
195 * value, otherwise it returns -EINVAL and *res is set to 0.
197 int strict_strtol(const char *cp, unsigned int base, long *res)
201 ret = strict_strtoul(cp + 1, base, (unsigned long *)res);
205 ret = strict_strtoul(cp, base, (unsigned long *)res);
210 EXPORT_SYMBOL(strict_strtol);
213 * strict_strtoull - convert a string to an unsigned long long strictly
214 * @cp: The string to be converted
215 * @base: The number base to use
216 * @res: The converted result value
218 * strict_strtoull converts a string to an unsigned long long only if the
219 * string is really an unsigned long long string, any string containing
220 * any invalid char at the tail will be rejected and -EINVAL is returned,
221 * only a newline char at the tail is acceptible because people generally
222 * change a module parameter in the following way:
224 * echo 1024 > /sys/module/e1000/parameters/copybreak
226 * echo will append a newline to the tail of the string.
228 * It returns 0 if conversion is successful and *res is set to the converted
229 * value, otherwise it returns -EINVAL and *res is set to 0.
231 * simple_strtoull just ignores the successive invalid characters and
232 * return the converted value of prefix part of the string.
234 int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res)
237 unsigned long long val;
245 val = simple_strtoull(cp, &tail, base);
248 if ((*tail == '\0') ||
249 ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {
256 EXPORT_SYMBOL(strict_strtoull);
259 * strict_strtoll - convert a string to a long long strictly
260 * @cp: The string to be converted
261 * @base: The number base to use
262 * @res: The converted result value
264 * strict_strtoll is similiar to strict_strtoull, but it allows the first
265 * character of a string is '-'.
267 * It returns 0 if conversion is successful and *res is set to the converted
268 * value, otherwise it returns -EINVAL and *res is set to 0.
270 int strict_strtoll(const char *cp, unsigned int base, long long *res)
274 ret = strict_strtoull(cp + 1, base, (unsigned long long *)res);
278 ret = strict_strtoull(cp, base, (unsigned long long *)res);
283 EXPORT_SYMBOL(strict_strtoll);
285 static int skip_atoi(const char **s)
290 i = i*10 + *((*s)++) - '0';
294 /* Decimal conversion is by far the most typical, and is used
295 * for /proc and /sys data. This directly impacts e.g. top performance
296 * with many processes running. We optimize it for speed
298 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
299 * (with permission from the author, Douglas W. Jones). */
301 /* Formats correctly any integer in [0,99999].
302 * Outputs from one to five digits depending on input.
303 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
304 static char* put_dec_trunc(char *buf, unsigned q)
306 unsigned d3, d2, d1, d0;
311 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
312 q = (d0 * 0xcd) >> 11;
314 *buf++ = d0 + '0'; /* least significant digit */
315 d1 = q + 9*d3 + 5*d2 + d1;
317 q = (d1 * 0xcd) >> 11;
319 *buf++ = d1 + '0'; /* next digit */
322 if ((d2 != 0) || (d3 != 0)) {
325 *buf++ = d2 + '0'; /* next digit */
329 q = (d3 * 0xcd) >> 11;
331 *buf++ = d3 + '0'; /* next digit */
333 *buf++ = q + '0'; /* most sign. digit */
339 /* Same with if's removed. Always emits five digits */
340 static char* put_dec_full(char *buf, unsigned q)
342 /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
343 /* but anyway, gcc produces better code with full-sized ints */
344 unsigned d3, d2, d1, d0;
349 /* Possible ways to approx. divide by 10 */
350 /* gcc -O2 replaces multiply with shifts and adds */
351 // (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
352 // (x * 0x67) >> 10: 1100111
353 // (x * 0x34) >> 9: 110100 - same
354 // (x * 0x1a) >> 8: 11010 - same
355 // (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
357 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
358 q = (d0 * 0xcd) >> 11;
361 d1 = q + 9*d3 + 5*d2 + d1;
362 q = (d1 * 0xcd) >> 11;
372 q = (d3 * 0xcd) >> 11; /* - shorter code */
373 /* q = (d3 * 0x67) >> 10; - would also work */
379 /* No inlining helps gcc to use registers better */
380 static noinline char* put_dec(char *buf, unsigned long long num)
385 return put_dec_trunc(buf, num);
386 rem = do_div(num, 100000);
387 buf = put_dec_full(buf, rem);
391 #define ZEROPAD 1 /* pad with zero */
392 #define SIGN 2 /* unsigned/signed long */
393 #define PLUS 4 /* show plus */
394 #define SPACE 8 /* space if plus */
395 #define LEFT 16 /* left justified */
396 #define SMALL 32 /* Must be 32 == 0x20 */
397 #define SPECIAL 64 /* 0x */
400 FORMAT_TYPE_NONE, /* Just a string part */
402 FORMAT_TYPE_PRECISION,
406 FORMAT_TYPE_PERCENT_CHAR,
408 FORMAT_TYPE_LONG_LONG,
421 enum format_type type;
422 int flags; /* flags to number() */
423 int field_width; /* width of output field */
425 int precision; /* # of digits/chars */
429 static char *number(char *buf, char *end, unsigned long long num,
430 struct printf_spec spec)
432 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
433 static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
438 int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
441 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
442 * produces same digits or (maybe lowercased) letters */
443 locase = (spec.flags & SMALL);
444 if (spec.flags & LEFT)
445 spec.flags &= ~ZEROPAD;
447 if (spec.flags & SIGN) {
448 if ((signed long long) num < 0) {
450 num = - (signed long long) num;
452 } else if (spec.flags & PLUS) {
455 } else if (spec.flags & SPACE) {
466 /* generate full string in tmp[], in reverse order */
470 /* Generic code, for any base:
472 tmp[i++] = (digits[do_div(num,base)] | locase);
475 else if (spec.base != 10) { /* 8 or 16 */
476 int mask = spec.base - 1;
478 if (spec.base == 16) shift = 4;
480 tmp[i++] = (digits[((unsigned char)num) & mask] | locase);
483 } else { /* base 10 */
484 i = put_dec(tmp, num) - tmp;
487 /* printing 100 using %2d gives "100", not "00" */
488 if (i > spec.precision)
490 /* leading space padding */
491 spec.field_width -= spec.precision;
492 if (!(spec.flags & (ZEROPAD+LEFT))) {
493 while(--spec.field_width >= 0) {
505 /* "0x" / "0" prefix */
510 if (spec.base == 16) {
512 *buf = ('X' | locase);
516 /* zero or space padding */
517 if (!(spec.flags & LEFT)) {
518 char c = (spec.flags & ZEROPAD) ? '0' : ' ';
519 while (--spec.field_width >= 0) {
525 /* hmm even more zero padding? */
526 while (i <= --spec.precision) {
531 /* actual digits of result */
537 /* trailing space padding */
538 while (--spec.field_width >= 0) {
546 static char *string(char *buf, char *end, char *s, struct printf_spec spec)
550 if ((unsigned long)s < PAGE_SIZE)
553 len = strnlen(s, spec.precision);
555 if (!(spec.flags & LEFT)) {
556 while (len < spec.field_width--) {
562 for (i = 0; i < len; ++i) {
567 while (len < spec.field_width--) {
575 static char *symbol_string(char *buf, char *end, void *ptr,
576 struct printf_spec spec)
578 unsigned long value = (unsigned long) ptr;
579 #ifdef CONFIG_KALLSYMS
580 char sym[KSYM_SYMBOL_LEN];
581 sprint_symbol(sym, value);
582 return string(buf, end, sym, spec);
584 spec.field_width = 2*sizeof(void *);
585 spec.flags |= SPECIAL | SMALL | ZEROPAD;
587 return number(buf, end, value, spec);
591 static char *resource_string(char *buf, char *end, struct resource *res,
592 struct printf_spec spec)
594 #ifndef IO_RSRC_PRINTK_SIZE
595 #define IO_RSRC_PRINTK_SIZE 4
598 #ifndef MEM_RSRC_PRINTK_SIZE
599 #define MEM_RSRC_PRINTK_SIZE 8
601 struct printf_spec num_spec = {
604 .flags = SPECIAL | SMALL | ZEROPAD,
606 /* room for the actual numbers, the two "0x", -, [, ] and the final zero */
607 char sym[4*sizeof(resource_size_t) + 8];
608 char *p = sym, *pend = sym + sizeof(sym);
611 if (res->flags & IORESOURCE_IO)
612 size = IO_RSRC_PRINTK_SIZE;
613 else if (res->flags & IORESOURCE_MEM)
614 size = MEM_RSRC_PRINTK_SIZE;
617 num_spec.field_width = size;
618 p = number(p, pend, res->start, num_spec);
620 p = number(p, pend, res->end, num_spec);
624 return string(buf, end, sym, spec);
627 static char *mac_address_string(char *buf, char *end, u8 *addr,
628 struct printf_spec spec)
630 char mac_addr[6 * 3]; /* (6 * 2 hex digits), 5 colons and trailing zero */
634 for (i = 0; i < 6; i++) {
635 p = pack_hex_byte(p, addr[i]);
636 if (!(spec.flags & SPECIAL) && i != 5)
640 spec.flags &= ~SPECIAL;
642 return string(buf, end, mac_addr, spec);
645 static char *ip6_addr_string(char *buf, char *end, u8 *addr,
646 struct printf_spec spec)
648 char ip6_addr[8 * 5]; /* (8 * 4 hex digits), 7 colons and trailing zero */
652 for (i = 0; i < 8; i++) {
653 p = pack_hex_byte(p, addr[2 * i]);
654 p = pack_hex_byte(p, addr[2 * i + 1]);
655 if (!(spec.flags & SPECIAL) && i != 7)
659 spec.flags &= ~SPECIAL;
661 return string(buf, end, ip6_addr, spec);
664 static char *ip4_addr_string(char *buf, char *end, u8 *addr,
665 struct printf_spec spec)
667 char ip4_addr[4 * 4]; /* (4 * 3 decimal digits), 3 dots and trailing zero */
668 char temp[3]; /* hold each IP quad in reverse order */
672 for (i = 0; i < 4; i++) {
673 digits = put_dec_trunc(temp, addr[i]) - temp;
674 /* reverse the digits in the quad */
681 spec.flags &= ~SPECIAL;
683 return string(buf, end, ip4_addr, spec);
687 * Show a '%p' thing. A kernel extension is that the '%p' is followed
688 * by an extra set of alphanumeric characters that are extended format
691 * Right now we handle:
693 * - 'F' For symbolic function descriptor pointers
694 * - 'S' For symbolic direct pointers
695 * - 'R' For a struct resource pointer, it prints the range of
696 * addresses (not the name nor the flags)
697 * - 'M' For a 6-byte MAC address, it prints the address in the
698 * usual colon-separated hex notation
699 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
700 * decimal for v4 and colon separated network-order 16 bit hex for v6)
701 * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
704 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
705 * function pointers are really function descriptors, which contain a
706 * pointer to the real address.
708 static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
709 struct printf_spec spec)
712 return string(buf, end, "(null)", spec);
716 ptr = dereference_function_descriptor(ptr);
719 return symbol_string(buf, end, ptr, spec);
721 return resource_string(buf, end, ptr, spec);
723 spec.flags |= SPECIAL;
726 return mac_address_string(buf, end, ptr, spec);
728 spec.flags |= SPECIAL;
732 return ip6_addr_string(buf, end, ptr, spec);
734 return ip4_addr_string(buf, end, ptr, spec);
735 spec.flags &= ~SPECIAL;
739 if (spec.field_width == -1) {
740 spec.field_width = 2*sizeof(void *);
741 spec.flags |= ZEROPAD;
745 return number(buf, end, (unsigned long) ptr, spec);
749 * Helper function to decode printf style format.
750 * Each call decode a token from the format and return the
751 * number of characters read (or likely the delta where it wants
752 * to go on the next call).
753 * The decoded token is returned through the parameters
755 * 'h', 'l', or 'L' for integer fields
756 * 'z' support added 23/7/1999 S.H.
757 * 'z' changed to 'Z' --davidm 1/25/99
758 * 't' added for ptrdiff_t
760 * @fmt: the format string
761 * @type of the token returned
762 * @flags: various flags such as +, -, # tokens..
763 * @field_width: overwritten width
764 * @base: base of the number (octal, hex, ...)
765 * @precision: precision of a number
766 * @qualifier: qualifier of a number (long, size_t, ...)
768 static int format_decode(const char *fmt, struct printf_spec *spec)
770 const char *start = fmt;
772 /* we finished early by reading the field width */
773 if (spec->type == FORMAT_TYPE_WIDTH) {
774 if (spec->field_width < 0) {
775 spec->field_width = -spec->field_width;
778 spec->type = FORMAT_TYPE_NONE;
782 /* we finished early by reading the precision */
783 if (spec->type == FORMAT_TYPE_PRECISION) {
784 if (spec->precision < 0)
787 spec->type = FORMAT_TYPE_NONE;
792 spec->type = FORMAT_TYPE_NONE;
794 for (; *fmt ; ++fmt) {
799 /* Return the current non-format string */
800 if (fmt != start || !*fmt)
806 while (1) { /* this also skips first '%' */
812 case '-': spec->flags |= LEFT; break;
813 case '+': spec->flags |= PLUS; break;
814 case ' ': spec->flags |= SPACE; break;
815 case '#': spec->flags |= SPECIAL; break;
816 case '0': spec->flags |= ZEROPAD; break;
817 default: found = false;
824 /* get field width */
825 spec->field_width = -1;
828 spec->field_width = skip_atoi(&fmt);
829 else if (*fmt == '*') {
830 /* it's the next argument */
831 spec->type = FORMAT_TYPE_WIDTH;
832 return ++fmt - start;
836 /* get the precision */
837 spec->precision = -1;
841 spec->precision = skip_atoi(&fmt);
842 if (spec->precision < 0)
844 } else if (*fmt == '*') {
845 /* it's the next argument */
846 spec->type = FORMAT_TYPE_PRECISION;
847 return ++fmt - start;
852 /* get the conversion qualifier */
853 spec->qualifier = -1;
854 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
855 *fmt == 'Z' || *fmt == 'z' || *fmt == 't') {
856 spec->qualifier = *fmt;
858 if (spec->qualifier == 'l' && *fmt == 'l') {
859 spec->qualifier = 'L';
868 spec->type = FORMAT_TYPE_CHAR;
869 return ++fmt - start;
872 spec->type = FORMAT_TYPE_STR;
873 return ++fmt - start;
876 spec->type = FORMAT_TYPE_PTR;
881 spec->type = FORMAT_TYPE_NRCHARS;
882 return ++fmt - start;
885 spec->type = FORMAT_TYPE_PERCENT_CHAR;
886 return ++fmt - start;
888 /* integer number formats - set up the flags and "break" */
894 spec->flags |= SMALL;
907 spec->type = FORMAT_TYPE_INVALID;
911 if (spec->qualifier == 'L')
912 spec->type = FORMAT_TYPE_LONG_LONG;
913 else if (spec->qualifier == 'l') {
914 if (spec->flags & SIGN)
915 spec->type = FORMAT_TYPE_LONG;
917 spec->type = FORMAT_TYPE_ULONG;
918 } else if (spec->qualifier == 'Z' || spec->qualifier == 'z') {
919 spec->type = FORMAT_TYPE_SIZE_T;
920 } else if (spec->qualifier == 't') {
921 spec->type = FORMAT_TYPE_PTRDIFF;
922 } else if (spec->qualifier == 'h') {
923 if (spec->flags & SIGN)
924 spec->type = FORMAT_TYPE_SHORT;
926 spec->type = FORMAT_TYPE_USHORT;
928 if (spec->flags & SIGN)
929 spec->type = FORMAT_TYPE_INT;
931 spec->type = FORMAT_TYPE_UINT;
934 return ++fmt - start;
938 * vsnprintf - Format a string and place it in a buffer
939 * @buf: The buffer to place the result into
940 * @size: The size of the buffer, including the trailing null space
941 * @fmt: The format string to use
942 * @args: Arguments for the format string
944 * This function follows C99 vsnprintf, but has some extensions:
945 * %pS output the name of a text symbol
946 * %pF output the name of a function pointer
947 * %pR output the address range in a struct resource
949 * The return value is the number of characters which would
950 * be generated for the given input, excluding the trailing
951 * '\0', as per ISO C99. If you want to have the exact
952 * number of characters written into @buf as return value
953 * (not including the trailing '\0'), use vscnprintf(). If the
954 * return is greater than or equal to @size, the resulting
955 * string is truncated.
957 * Call this function if you are already dealing with a va_list.
958 * You probably want snprintf() instead.
960 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
962 unsigned long long num;
965 struct printf_spec spec = {0};
967 /* Reject out-of-range values early. Large positive sizes are
968 used for unknown buffer sizes. */
969 if (unlikely((int) size < 0)) {
970 /* There can be only one.. */
971 static char warn = 1;
980 /* Make sure end is always >= buf */
987 const char *old_fmt = fmt;
989 read = format_decode(fmt, &spec);
994 case FORMAT_TYPE_NONE: {
997 if (copy > end - str)
999 memcpy(str, old_fmt, copy);
1005 case FORMAT_TYPE_WIDTH:
1006 spec.field_width = va_arg(args, int);
1009 case FORMAT_TYPE_PRECISION:
1010 spec.precision = va_arg(args, int);
1013 case FORMAT_TYPE_CHAR:
1014 if (!(spec.flags & LEFT)) {
1015 while (--spec.field_width > 0) {
1022 c = (unsigned char) va_arg(args, int);
1026 while (--spec.field_width > 0) {
1033 case FORMAT_TYPE_STR:
1034 str = string(str, end, va_arg(args, char *), spec);
1037 case FORMAT_TYPE_PTR:
1038 str = pointer(fmt+1, str, end, va_arg(args, void *),
1040 while (isalnum(*fmt))
1044 case FORMAT_TYPE_PERCENT_CHAR:
1050 case FORMAT_TYPE_INVALID:
1063 case FORMAT_TYPE_NRCHARS: {
1064 int qualifier = spec.qualifier;
1066 if (qualifier == 'l') {
1067 long *ip = va_arg(args, long *);
1069 } else if (qualifier == 'Z' ||
1071 size_t *ip = va_arg(args, size_t *);
1074 int *ip = va_arg(args, int *);
1081 switch (spec.type) {
1082 case FORMAT_TYPE_LONG_LONG:
1083 num = va_arg(args, long long);
1085 case FORMAT_TYPE_ULONG:
1086 num = va_arg(args, unsigned long);
1088 case FORMAT_TYPE_LONG:
1089 num = va_arg(args, long);
1091 case FORMAT_TYPE_SIZE_T:
1092 num = va_arg(args, size_t);
1094 case FORMAT_TYPE_PTRDIFF:
1095 num = va_arg(args, ptrdiff_t);
1097 case FORMAT_TYPE_USHORT:
1098 num = (unsigned short) va_arg(args, int);
1100 case FORMAT_TYPE_SHORT:
1101 num = (short) va_arg(args, int);
1103 case FORMAT_TYPE_INT:
1104 num = (int) va_arg(args, int);
1107 num = va_arg(args, unsigned int);
1110 str = number(str, end, num, spec);
1121 /* the trailing null byte doesn't count towards the total */
1125 EXPORT_SYMBOL(vsnprintf);
1128 * vscnprintf - Format a string and place it in a buffer
1129 * @buf: The buffer to place the result into
1130 * @size: The size of the buffer, including the trailing null space
1131 * @fmt: The format string to use
1132 * @args: Arguments for the format string
1134 * The return value is the number of characters which have been written into
1135 * the @buf not including the trailing '\0'. If @size is <= 0 the function
1138 * Call this function if you are already dealing with a va_list.
1139 * You probably want scnprintf() instead.
1141 * See the vsnprintf() documentation for format string extensions over C99.
1143 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
1147 i=vsnprintf(buf,size,fmt,args);
1148 return (i >= size) ? (size - 1) : i;
1150 EXPORT_SYMBOL(vscnprintf);
1153 * snprintf - Format a string and place it in a buffer
1154 * @buf: The buffer to place the result into
1155 * @size: The size of the buffer, including the trailing null space
1156 * @fmt: The format string to use
1157 * @...: Arguments for the format string
1159 * The return value is the number of characters which would be
1160 * generated for the given input, excluding the trailing null,
1161 * as per ISO C99. If the return is greater than or equal to
1162 * @size, the resulting string is truncated.
1164 * See the vsnprintf() documentation for format string extensions over C99.
1166 int snprintf(char * buf, size_t size, const char *fmt, ...)
1171 va_start(args, fmt);
1172 i=vsnprintf(buf,size,fmt,args);
1176 EXPORT_SYMBOL(snprintf);
1179 * scnprintf - Format a string and place it in a buffer
1180 * @buf: The buffer to place the result into
1181 * @size: The size of the buffer, including the trailing null space
1182 * @fmt: The format string to use
1183 * @...: Arguments for the format string
1185 * The return value is the number of characters written into @buf not including
1186 * the trailing '\0'. If @size is <= 0 the function returns 0.
1189 int scnprintf(char * buf, size_t size, const char *fmt, ...)
1194 va_start(args, fmt);
1195 i = vsnprintf(buf, size, fmt, args);
1197 return (i >= size) ? (size - 1) : i;
1199 EXPORT_SYMBOL(scnprintf);
1202 * vsprintf - Format a string and place it in a buffer
1203 * @buf: The buffer to place the result into
1204 * @fmt: The format string to use
1205 * @args: Arguments for the format string
1207 * The function returns the number of characters written
1208 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
1211 * Call this function if you are already dealing with a va_list.
1212 * You probably want sprintf() instead.
1214 * See the vsnprintf() documentation for format string extensions over C99.
1216 int vsprintf(char *buf, const char *fmt, va_list args)
1218 return vsnprintf(buf, INT_MAX, fmt, args);
1220 EXPORT_SYMBOL(vsprintf);
1223 * sprintf - Format a string and place it in a buffer
1224 * @buf: The buffer to place the result into
1225 * @fmt: The format string to use
1226 * @...: Arguments for the format string
1228 * The function returns the number of characters written
1229 * into @buf. Use snprintf() or scnprintf() in order to avoid
1232 * See the vsnprintf() documentation for format string extensions over C99.
1234 int sprintf(char * buf, const char *fmt, ...)
1239 va_start(args, fmt);
1240 i=vsnprintf(buf, INT_MAX, fmt, args);
1244 EXPORT_SYMBOL(sprintf);
1246 #ifdef CONFIG_BINARY_PRINTF
1249 * vbin_printf() - VA arguments to binary data
1250 * bstr_printf() - Binary data to text string
1254 * vbin_printf - Parse a format string and place args' binary value in a buffer
1255 * @bin_buf: The buffer to place args' binary value
1256 * @size: The size of the buffer(by words(32bits), not characters)
1257 * @fmt: The format string to use
1258 * @args: Arguments for the format string
1260 * The format follows C99 vsnprintf, except %n is ignored, and its argument
1263 * The return value is the number of words(32bits) which would be generated for
1267 * If the return value is greater than @size, the resulting bin_buf is NOT
1268 * valid for bstr_printf().
1270 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
1272 struct printf_spec spec = {0};
1276 str = (char *)bin_buf;
1277 end = (char *)(bin_buf + size);
1279 #define save_arg(type) \
1281 if (sizeof(type) == 8) { \
1282 unsigned long long value; \
1283 str = PTR_ALIGN(str, sizeof(u32)); \
1284 value = va_arg(args, unsigned long long); \
1285 if (str + sizeof(type) <= end) { \
1286 *(u32 *)str = *(u32 *)&value; \
1287 *(u32 *)(str + 4) = *((u32 *)&value + 1); \
1290 unsigned long value; \
1291 str = PTR_ALIGN(str, sizeof(type)); \
1292 value = va_arg(args, int); \
1293 if (str + sizeof(type) <= end) \
1294 *(typeof(type) *)str = (type)value; \
1296 str += sizeof(type); \
1301 read = format_decode(fmt, &spec);
1305 switch (spec.type) {
1306 case FORMAT_TYPE_NONE:
1309 case FORMAT_TYPE_WIDTH:
1310 case FORMAT_TYPE_PRECISION:
1314 case FORMAT_TYPE_CHAR:
1318 case FORMAT_TYPE_STR: {
1319 const char *save_str = va_arg(args, char *);
1321 if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
1322 || (unsigned long)save_str < PAGE_SIZE)
1323 save_str = "<NULL>";
1324 len = strlen(save_str);
1325 if (str + len + 1 < end)
1326 memcpy(str, save_str, len + 1);
1331 case FORMAT_TYPE_PTR:
1333 /* skip all alphanumeric pointer suffixes */
1334 while (isalnum(*fmt))
1338 case FORMAT_TYPE_PERCENT_CHAR:
1341 case FORMAT_TYPE_INVALID:
1346 case FORMAT_TYPE_NRCHARS: {
1347 /* skip %n 's argument */
1348 int qualifier = spec.qualifier;
1350 if (qualifier == 'l')
1351 skip_arg = va_arg(args, long *);
1352 else if (qualifier == 'Z' || qualifier == 'z')
1353 skip_arg = va_arg(args, size_t *);
1355 skip_arg = va_arg(args, int *);
1360 switch (spec.type) {
1362 case FORMAT_TYPE_LONG_LONG:
1363 save_arg(long long);
1365 case FORMAT_TYPE_ULONG:
1366 case FORMAT_TYPE_LONG:
1367 save_arg(unsigned long);
1369 case FORMAT_TYPE_SIZE_T:
1372 case FORMAT_TYPE_PTRDIFF:
1373 save_arg(ptrdiff_t);
1375 case FORMAT_TYPE_USHORT:
1376 case FORMAT_TYPE_SHORT:
1384 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
1388 EXPORT_SYMBOL_GPL(vbin_printf);
1391 * bstr_printf - Format a string from binary arguments and place it in a buffer
1392 * @buf: The buffer to place the result into
1393 * @size: The size of the buffer, including the trailing null space
1394 * @fmt: The format string to use
1395 * @bin_buf: Binary arguments for the format string
1397 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
1398 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
1399 * a binary buffer that generated by vbin_printf.
1401 * The format follows C99 vsnprintf, but has some extensions:
1402 * %pS output the name of a text symbol
1403 * %pF output the name of a function pointer
1404 * %pR output the address range in a struct resource
1407 * The return value is the number of characters which would
1408 * be generated for the given input, excluding the trailing
1409 * '\0', as per ISO C99. If you want to have the exact
1410 * number of characters written into @buf as return value
1411 * (not including the trailing '\0'), use vscnprintf(). If the
1412 * return is greater than or equal to @size, the resulting
1413 * string is truncated.
1415 int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
1417 unsigned long long num;
1419 const char *args = (const char *)bin_buf;
1421 struct printf_spec spec = {0};
1423 if (unlikely((int) size < 0)) {
1424 /* There can be only one.. */
1425 static char warn = 1;
1434 #define get_arg(type) \
1436 typeof(type) value; \
1437 if (sizeof(type) == 8) { \
1438 args = PTR_ALIGN(args, sizeof(u32)); \
1439 *(u32 *)&value = *(u32 *)args; \
1440 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
1442 args = PTR_ALIGN(args, sizeof(type)); \
1443 value = *(typeof(type) *)args; \
1445 args += sizeof(type); \
1449 /* Make sure end is always >= buf */
1457 const char *old_fmt = fmt;
1459 read = format_decode(fmt, &spec);
1463 switch (spec.type) {
1464 case FORMAT_TYPE_NONE: {
1467 if (copy > end - str)
1469 memcpy(str, old_fmt, copy);
1475 case FORMAT_TYPE_WIDTH:
1476 spec.field_width = get_arg(int);
1479 case FORMAT_TYPE_PRECISION:
1480 spec.precision = get_arg(int);
1483 case FORMAT_TYPE_CHAR:
1484 if (!(spec.flags & LEFT)) {
1485 while (--spec.field_width > 0) {
1491 c = (unsigned char) get_arg(char);
1495 while (--spec.field_width > 0) {
1502 case FORMAT_TYPE_STR: {
1503 const char *str_arg = args;
1504 size_t len = strlen(str_arg);
1506 str = string(str, end, (char *)str_arg, spec);
1510 case FORMAT_TYPE_PTR:
1511 str = pointer(fmt+1, str, end, get_arg(void *), spec);
1512 while (isalnum(*fmt))
1516 case FORMAT_TYPE_PERCENT_CHAR:
1522 case FORMAT_TYPE_INVALID:
1535 case FORMAT_TYPE_NRCHARS:
1540 switch (spec.type) {
1542 case FORMAT_TYPE_LONG_LONG:
1543 num = get_arg(long long);
1545 case FORMAT_TYPE_ULONG:
1546 num = get_arg(unsigned long);
1548 case FORMAT_TYPE_LONG:
1549 num = get_arg(unsigned long);
1551 case FORMAT_TYPE_SIZE_T:
1552 num = get_arg(size_t);
1554 case FORMAT_TYPE_PTRDIFF:
1555 num = get_arg(ptrdiff_t);
1557 case FORMAT_TYPE_USHORT:
1558 num = get_arg(unsigned short);
1560 case FORMAT_TYPE_SHORT:
1561 num = get_arg(short);
1563 case FORMAT_TYPE_UINT:
1564 num = get_arg(unsigned int);
1570 str = number(str, end, num, spec);
1583 /* the trailing null byte doesn't count towards the total */
1586 EXPORT_SYMBOL_GPL(bstr_printf);
1589 * bprintf - Parse a format string and place args' binary value in a buffer
1590 * @bin_buf: The buffer to place args' binary value
1591 * @size: The size of the buffer(by words(32bits), not characters)
1592 * @fmt: The format string to use
1593 * @...: Arguments for the format string
1595 * The function returns the number of words(u32) written
1598 int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
1603 va_start(args, fmt);
1604 ret = vbin_printf(bin_buf, size, fmt, args);
1608 EXPORT_SYMBOL_GPL(bprintf);
1610 #endif /* CONFIG_BINARY_PRINTF */
1613 * vsscanf - Unformat a buffer into a list of arguments
1614 * @buf: input buffer
1615 * @fmt: format of buffer
1618 int vsscanf(const char * buf, const char * fmt, va_list args)
1620 const char *str = buf;
1629 while(*fmt && *str) {
1630 /* skip any white space in format */
1631 /* white space in format matchs any amount of
1632 * white space, including none, in the input.
1634 if (isspace(*fmt)) {
1635 while (isspace(*fmt))
1637 while (isspace(*str))
1641 /* anything that is not a conversion must match exactly */
1642 if (*fmt != '%' && *fmt) {
1643 if (*fmt++ != *str++)
1652 /* skip this conversion.
1653 * advance both strings to next white space
1656 while (!isspace(*fmt) && *fmt)
1658 while (!isspace(*str) && *str)
1663 /* get field width */
1666 field_width = skip_atoi(&fmt);
1668 /* get conversion qualifier */
1670 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
1671 *fmt == 'Z' || *fmt == 'z') {
1673 if (unlikely(qualifier == *fmt)) {
1674 if (qualifier == 'h') {
1677 } else if (qualifier == 'l') {
1692 char *s = (char *) va_arg(args,char*);
1693 if (field_width == -1)
1697 } while (--field_width > 0 && *str);
1703 char *s = (char *) va_arg(args, char *);
1704 if(field_width == -1)
1705 field_width = INT_MAX;
1706 /* first, skip leading white space in buffer */
1707 while (isspace(*str))
1710 /* now copy until next white space */
1711 while (*str && !isspace(*str) && field_width--) {
1719 /* return number of characters read so far */
1721 int *i = (int *)va_arg(args,int*);
1739 /* looking for '%' in str */
1744 /* invalid format; stop here */
1748 /* have some sort of integer conversion.
1749 * first, skip white space in buffer.
1751 while (isspace(*str))
1755 if (is_sign && digit == '-')
1759 || (base == 16 && !isxdigit(digit))
1760 || (base == 10 && !isdigit(digit))
1761 || (base == 8 && (!isdigit(digit) || digit > '7'))
1762 || (base == 0 && !isdigit(digit)))
1766 case 'H': /* that's 'hh' in format */
1768 signed char *s = (signed char *) va_arg(args,signed char *);
1769 *s = (signed char) simple_strtol(str,&next,base);
1771 unsigned char *s = (unsigned char *) va_arg(args, unsigned char *);
1772 *s = (unsigned char) simple_strtoul(str, &next, base);
1777 short *s = (short *) va_arg(args,short *);
1778 *s = (short) simple_strtol(str,&next,base);
1780 unsigned short *s = (unsigned short *) va_arg(args, unsigned short *);
1781 *s = (unsigned short) simple_strtoul(str, &next, base);
1786 long *l = (long *) va_arg(args,long *);
1787 *l = simple_strtol(str,&next,base);
1789 unsigned long *l = (unsigned long*) va_arg(args,unsigned long*);
1790 *l = simple_strtoul(str,&next,base);
1795 long long *l = (long long*) va_arg(args,long long *);
1796 *l = simple_strtoll(str,&next,base);
1798 unsigned long long *l = (unsigned long long*) va_arg(args,unsigned long long*);
1799 *l = simple_strtoull(str,&next,base);
1805 size_t *s = (size_t*) va_arg(args,size_t*);
1806 *s = (size_t) simple_strtoul(str,&next,base);
1811 int *i = (int *) va_arg(args, int*);
1812 *i = (int) simple_strtol(str,&next,base);
1814 unsigned int *i = (unsigned int*) va_arg(args, unsigned int*);
1815 *i = (unsigned int) simple_strtoul(str,&next,base);
1827 * Now we've come all the way through so either the input string or the
1828 * format ended. In the former case, there can be a %n at the current
1829 * position in the format that needs to be filled.
1831 if (*fmt == '%' && *(fmt + 1) == 'n') {
1832 int *p = (int *)va_arg(args, int *);
1838 EXPORT_SYMBOL(vsscanf);
1841 * sscanf - Unformat a buffer into a list of arguments
1842 * @buf: input buffer
1843 * @fmt: formatting of buffer
1844 * @...: resulting arguments
1846 int sscanf(const char * buf, const char * fmt, ...)
1852 i = vsscanf(buf,fmt,args);
1856 EXPORT_SYMBOL(sscanf);