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lib/vsprintf.c
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/* * linux/lib/vsprintf.c * * Copyright (C) 1991, 1992 Linus Torvalds */ /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */ /* * Wirzenius wrote this portably, Torvalds fucked it up :-) */ /* * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com> * - changed to provide snprintf and vsnprintf functions * So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de> * - scnprintf and vscnprintf */ #include <stdarg.h> #include <linux/module.h> #include <linux/types.h> #include <linux/string.h> #include <linux/ctype.h> #include <linux/kernel.h> |
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#include <linux/kallsyms.h> #include <linux/uaccess.h> |
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#include <linux/ioport.h> |
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#include <asm/page.h> /* for PAGE_SIZE */ |
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#include <asm/div64.h> |
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#include <asm/sections.h> /* for dereference_function_descriptor() */ |
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/* Works only for digits and letters, but small and fast */ #define TOLOWER(x) ((x) | 0x20) |
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static unsigned int simple_guess_base(const char *cp) { if (cp[0] == '0') { if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2])) return 16; else return 8; } else { return 10; } } |
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/** * simple_strtoul - convert a string to an unsigned long * @cp: The start of the string * @endp: A pointer to the end of the parsed string will be placed here * @base: The number base to use */ |
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unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
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{ |
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unsigned long result = 0; if (!base) base = simple_guess_base(cp); if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x') cp += 2; while (isxdigit(*cp)) { unsigned int value; value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10; if (value >= base) break; result = result * base + value; |
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cp++; } |
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if (endp) *endp = (char *)cp; return result; } |
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EXPORT_SYMBOL(simple_strtoul); /** * simple_strtol - convert a string to a signed long * @cp: The start of the string * @endp: A pointer to the end of the parsed string will be placed here * @base: The number base to use */ |
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long simple_strtol(const char *cp, char **endp, unsigned int base) |
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{ |
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if(*cp == '-') return -simple_strtoul(cp + 1, endp, base); return simple_strtoul(cp, endp, base); |
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} |
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EXPORT_SYMBOL(simple_strtol); /** * simple_strtoull - convert a string to an unsigned long long * @cp: The start of the string * @endp: A pointer to the end of the parsed string will be placed here * @base: The number base to use */ |
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unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
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{ |
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unsigned long long result = 0; if (!base) base = simple_guess_base(cp); if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x') cp += 2; while (isxdigit(*cp)) { unsigned int value; value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10; if (value >= base) break; result = result * base + value; |
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cp++; } |
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if (endp) *endp = (char *)cp; return result; } |
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EXPORT_SYMBOL(simple_strtoull); /** * simple_strtoll - convert a string to a signed long long * @cp: The start of the string * @endp: A pointer to the end of the parsed string will be placed here * @base: The number base to use */ |
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long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
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{ if(*cp=='-') |
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return -simple_strtoull(cp + 1, endp, base); return simple_strtoull(cp, endp, base); |
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} |
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/** * strict_strtoul - convert a string to an unsigned long strictly * @cp: The string to be converted * @base: The number base to use * @res: The converted result value * * strict_strtoul converts a string to an unsigned long only if the * string is really an unsigned long string, any string containing * any invalid char at the tail will be rejected and -EINVAL is returned, * only a newline char at the tail is acceptible because people generally * change a module parameter in the following way: * * echo 1024 > /sys/module/e1000/parameters/copybreak * * echo will append a newline to the tail. * * It returns 0 if conversion is successful and *res is set to the converted * value, otherwise it returns -EINVAL and *res is set to 0. * * simple_strtoul just ignores the successive invalid characters and * return the converted value of prefix part of the string. */ |
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int strict_strtoul(const char *cp, unsigned int base, unsigned long *res) { char *tail; unsigned long val; size_t len; *res = 0; len = strlen(cp); if (len == 0) return -EINVAL; val = simple_strtoul(cp, &tail, base); |
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if (tail == cp) return -EINVAL; |
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if ((*tail == '\0') || ((len == (size_t)(tail - cp) + 1) && (*tail == ' '))) { *res = val; return 0; } return -EINVAL; } EXPORT_SYMBOL(strict_strtoul); |
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/** * strict_strtol - convert a string to a long strictly * @cp: The string to be converted * @base: The number base to use * @res: The converted result value * * strict_strtol is similiar to strict_strtoul, but it allows the first * character of a string is '-'. * * It returns 0 if conversion is successful and *res is set to the converted * value, otherwise it returns -EINVAL and *res is set to 0. */ |
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int strict_strtol(const char *cp, unsigned int base, long *res) { int ret; if (*cp == '-') { ret = strict_strtoul(cp + 1, base, (unsigned long *)res); if (!ret) *res = -(*res); } else { ret = strict_strtoul(cp, base, (unsigned long *)res); } return ret; } EXPORT_SYMBOL(strict_strtol); |
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/** * strict_strtoull - convert a string to an unsigned long long strictly * @cp: The string to be converted * @base: The number base to use * @res: The converted result value * * strict_strtoull converts a string to an unsigned long long only if the * string is really an unsigned long long string, any string containing * any invalid char at the tail will be rejected and -EINVAL is returned, * only a newline char at the tail is acceptible because people generally * change a module parameter in the following way: * * echo 1024 > /sys/module/e1000/parameters/copybreak * * echo will append a newline to the tail of the string. * * It returns 0 if conversion is successful and *res is set to the converted * value, otherwise it returns -EINVAL and *res is set to 0. * * simple_strtoull just ignores the successive invalid characters and * return the converted value of prefix part of the string. */ |
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int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res) { char *tail; unsigned long long val; size_t len; *res = 0; len = strlen(cp); if (len == 0) return -EINVAL; val = simple_strtoull(cp, &tail, base); |
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if (tail == cp) return -EINVAL; |
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if ((*tail == '\0') || ((len == (size_t)(tail - cp) + 1) && (*tail == ' '))) { *res = val; return 0; } return -EINVAL; } EXPORT_SYMBOL(strict_strtoull); |
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/** * strict_strtoll - convert a string to a long long strictly * @cp: The string to be converted * @base: The number base to use * @res: The converted result value * * strict_strtoll is similiar to strict_strtoull, but it allows the first * character of a string is '-'. * * It returns 0 if conversion is successful and *res is set to the converted * value, otherwise it returns -EINVAL and *res is set to 0. */ |
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int strict_strtoll(const char *cp, unsigned int base, long long *res) { int ret; if (*cp == '-') { ret = strict_strtoull(cp + 1, base, (unsigned long long *)res); if (!ret) *res = -(*res); } else { ret = strict_strtoull(cp, base, (unsigned long long *)res); } |
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return ret; } |
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EXPORT_SYMBOL(strict_strtoll); |
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static int skip_atoi(const char **s) { int i=0; while (isdigit(**s)) i = i*10 + *((*s)++) - '0'; return i; } |
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/* Decimal conversion is by far the most typical, and is used * for /proc and /sys data. This directly impacts e.g. top performance * with many processes running. We optimize it for speed * using code from * http://www.cs.uiowa.edu/~jones/bcd/decimal.html * (with permission from the author, Douglas W. Jones). */ /* Formats correctly any integer in [0,99999]. * Outputs from one to five digits depending on input. * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */ static char* put_dec_trunc(char *buf, unsigned q) { unsigned d3, d2, d1, d0; d1 = (q>>4) & 0xf; d2 = (q>>8) & 0xf; d3 = (q>>12); d0 = 6*(d3 + d2 + d1) + (q & 0xf); q = (d0 * 0xcd) >> 11; d0 = d0 - 10*q; *buf++ = d0 + '0'; /* least significant digit */ d1 = q + 9*d3 + 5*d2 + d1; if (d1 != 0) { q = (d1 * 0xcd) >> 11; d1 = d1 - 10*q; *buf++ = d1 + '0'; /* next digit */ d2 = q + 2*d2; if ((d2 != 0) || (d3 != 0)) { q = (d2 * 0xd) >> 7; d2 = d2 - 10*q; *buf++ = d2 + '0'; /* next digit */ d3 = q + 4*d3; if (d3 != 0) { q = (d3 * 0xcd) >> 11; d3 = d3 - 10*q; *buf++ = d3 + '0'; /* next digit */ if (q != 0) *buf++ = q + '0'; /* most sign. digit */ } } } return buf; } /* Same with if's removed. Always emits five digits */ static char* put_dec_full(char *buf, unsigned q) { /* BTW, if q is in [0,9999], 8-bit ints will be enough, */ /* but anyway, gcc produces better code with full-sized ints */ unsigned d3, d2, d1, d0; d1 = (q>>4) & 0xf; d2 = (q>>8) & 0xf; d3 = (q>>12); /* Possible ways to approx. divide by 10 */ /* gcc -O2 replaces multiply with shifts and adds */ // (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386) // (x * 0x67) >> 10: 1100111 // (x * 0x34) >> 9: 110100 - same // (x * 0x1a) >> 8: 11010 - same // (x * 0x0d) >> 7: 1101 - same, shortest code (on i386) d0 = 6*(d3 + d2 + d1) + (q & 0xf); q = (d0 * 0xcd) >> 11; d0 = d0 - 10*q; *buf++ = d0 + '0'; d1 = q + 9*d3 + 5*d2 + d1; q = (d1 * 0xcd) >> 11; d1 = d1 - 10*q; *buf++ = d1 + '0'; d2 = q + 2*d2; q = (d2 * 0xd) >> 7; d2 = d2 - 10*q; *buf++ = d2 + '0'; d3 = q + 4*d3; q = (d3 * 0xcd) >> 11; /* - shorter code */ /* q = (d3 * 0x67) >> 10; - would also work */ d3 = d3 - 10*q; *buf++ = d3 + '0'; *buf++ = q + '0'; return buf; } /* No inlining helps gcc to use registers better */ static noinline char* put_dec(char *buf, unsigned long long num) { while (1) { unsigned rem; if (num < 100000) return put_dec_trunc(buf, num); rem = do_div(num, 100000); buf = put_dec_full(buf, rem); } } |
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#define ZEROPAD 1 /* pad with zero */ #define SIGN 2 /* unsigned/signed long */ #define PLUS 4 /* show plus */ #define SPACE 8 /* space if plus */ #define LEFT 16 /* left justified */ |
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#define SMALL 32 /* Must be 32 == 0x20 */ #define SPECIAL 64 /* 0x */ |
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static char *number(char *buf, char *end, unsigned long long num, int base, int size, int precision, int type) |
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{ |
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/* we are called with base 8, 10 or 16, only, thus don't need "G..." */ static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ char tmp[66]; char sign; char locase; |
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int need_pfx = ((type & SPECIAL) && base != 10); |
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int i; |
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/* locase = 0 or 0x20. ORing digits or letters with 'locase' * produces same digits or (maybe lowercased) letters */ locase = (type & SMALL); |
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if (type & LEFT) type &= ~ZEROPAD; |
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sign = 0; if (type & SIGN) { if ((signed long long) num < 0) { sign = '-'; num = - (signed long long) num; size--; } else if (type & PLUS) { sign = '+'; size--; } else if (type & SPACE) { sign = ' '; size--; } } |
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if (need_pfx) { size--; |
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if (base == 16) |
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size--; } |
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/* generate full string in tmp[], in reverse order */ |
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i = 0; if (num == 0) |
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tmp[i++] = '0'; |
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/* Generic code, for any base: else do { |
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tmp[i++] = (digits[do_div(num,base)] | locase); |
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} while (num != 0); */ |
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else if (base != 10) { /* 8 or 16 */ int mask = base - 1; int shift = 3; if (base == 16) shift = 4; do { |
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tmp[i++] = (digits[((unsigned char)num) & mask] | locase); |
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num >>= shift; } while (num); |
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} else { /* base 10 */ i = put_dec(tmp, num) - tmp; } |
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/* printing 100 using %2d gives "100", not "00" */ |
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if (i > precision) precision = i; |
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/* leading space padding */ |
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size -= precision; |
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if (!(type & (ZEROPAD+LEFT))) { while(--size >= 0) { |
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if (buf < end) |
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*buf = ' '; ++buf; } } |
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/* sign */ |
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if (sign) { |
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if (buf < end) |
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*buf = sign; ++buf; } |
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/* "0x" / "0" prefix */ if (need_pfx) { if (buf < end) *buf = '0'; ++buf; if (base == 16) { |
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if (buf < end) |
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*buf = ('X' | locase); |
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++buf; } } |
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/* zero or space padding */ |
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if (!(type & LEFT)) { |
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char c = (type & ZEROPAD) ? '0' : ' '; while (--size >= 0) { |
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if (buf < end) |
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*buf = c; ++buf; } } |
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/* hmm even more zero padding? */ while (i <= --precision) { |
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if (buf < end) |
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*buf = '0'; ++buf; } |
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/* actual digits of result */ while (--i >= 0) { |
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if (buf < end) |
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*buf = tmp[i]; ++buf; } |
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/* trailing space padding */ while (--size >= 0) { |
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if (buf < end) |
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*buf = ' '; ++buf; } return buf; } |
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static char *string(char *buf, char *end, char *s, int field_width, int precision, int flags) { int len, i; if ((unsigned long)s < PAGE_SIZE) s = "<NULL>"; len = strnlen(s, precision); if (!(flags & LEFT)) { while (len < field_width--) { if (buf < end) *buf = ' '; ++buf; } } for (i = 0; i < len; ++i) { if (buf < end) *buf = *s; ++buf; ++s; } while (len < field_width--) { if (buf < end) *buf = ' '; ++buf; } return buf; } |
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static char *symbol_string(char *buf, char *end, void *ptr, int field_width, int precision, int flags) { unsigned long value = (unsigned long) ptr; #ifdef CONFIG_KALLSYMS char sym[KSYM_SYMBOL_LEN]; sprint_symbol(sym, value); return string(buf, end, sym, field_width, precision, flags); #else field_width = 2*sizeof(void *); flags |= SPECIAL | SMALL | ZEROPAD; return number(buf, end, value, 16, field_width, precision, flags); #endif } |
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static char *resource_string(char *buf, char *end, struct resource *res, int field_width, int precision, int flags) { #ifndef IO_RSRC_PRINTK_SIZE #define IO_RSRC_PRINTK_SIZE 4 #endif #ifndef MEM_RSRC_PRINTK_SIZE #define MEM_RSRC_PRINTK_SIZE 8 #endif /* room for the actual numbers, the two "0x", -, [, ] and the final zero */ char sym[4*sizeof(resource_size_t) + 8]; char *p = sym, *pend = sym + sizeof(sym); int size = -1; if (res->flags & IORESOURCE_IO) size = IO_RSRC_PRINTK_SIZE; else if (res->flags & IORESOURCE_MEM) size = MEM_RSRC_PRINTK_SIZE; *p++ = '['; p = number(p, pend, res->start, 16, size, -1, SPECIAL | SMALL | ZEROPAD); *p++ = '-'; p = number(p, pend, res->end, 16, size, -1, SPECIAL | SMALL | ZEROPAD); *p++ = ']'; *p = 0; return string(buf, end, sym, field_width, precision, flags); } |
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static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width, int precision, int flags) { char mac_addr[6 * 3]; /* (6 * 2 hex digits), 5 colons and trailing zero */ char *p = mac_addr; int i; for (i = 0; i < 6; i++) { p = pack_hex_byte(p, addr[i]); if (!(flags & SPECIAL) && i != 5) *p++ = ':'; } *p = '\0'; return string(buf, end, mac_addr, field_width, precision, flags & ~SPECIAL); } |
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static char *ip6_addr_string(char *buf, char *end, u8 *addr, int field_width, int precision, int flags) { char ip6_addr[8 * 5]; /* (8 * 4 hex digits), 7 colons and trailing zero */ char *p = ip6_addr; int i; for (i = 0; i < 8; i++) { p = pack_hex_byte(p, addr[2 * i]); p = pack_hex_byte(p, addr[2 * i + 1]); if (!(flags & SPECIAL) && i != 7) *p++ = ':'; } *p = '\0'; return string(buf, end, ip6_addr, field_width, precision, flags & ~SPECIAL); } |
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static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width, int precision, int flags) { char ip4_addr[4 * 4]; /* (4 * 3 decimal digits), 3 dots and trailing zero */ |
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char temp[3]; /* hold each IP quad in reverse order */ |
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char *p = ip4_addr; |
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int i, digits; |
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for (i = 0; i < 4; i++) { |
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digits = put_dec_trunc(temp, addr[i]) - temp; /* reverse the digits in the quad */ while (digits--) *p++ = temp[digits]; |
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if (i != 3) *p++ = '.'; } *p = '\0'; return string(buf, end, ip4_addr, field_width, precision, flags & ~SPECIAL); } |
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/* * Show a '%p' thing. A kernel extension is that the '%p' is followed * by an extra set of alphanumeric characters that are extended format * specifiers. * |
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* Right now we handle: * * - 'F' For symbolic function descriptor pointers * - 'S' For symbolic direct pointers * - 'R' For a struct resource pointer, it prints the range of * addresses (not the name nor the flags) |
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* - 'M' For a 6-byte MAC address, it prints the address in the * usual colon-separated hex notation |
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* - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated * decimal for v4 and colon separated network-order 16 bit hex for v6) * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is |
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* currently the same |
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* |
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* Note: The difference between 'S' and 'F' is that on ia64 and ppc64 * function pointers are really function descriptors, which contain a * pointer to the real address. |
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*/ static char *pointer(const char *fmt, char *buf, char *end, void *ptr, int field_width, int precision, int flags) |
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{ |
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if (!ptr) return string(buf, end, "(null)", field_width, precision, flags); |
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659 660 661 662 663 664 |
switch (*fmt) { case 'F': ptr = dereference_function_descriptor(ptr); /* Fallthrough */ case 'S': return symbol_string(buf, end, ptr, field_width, precision, flags); |
332d2e783
|
665 666 |
case 'R': return resource_string(buf, end, ptr, field_width, precision, flags); |
411c41eea
|
667 668 669 |
case 'm': flags |= SPECIAL; /* Fallthrough */ |
dd45c9cf6
|
670 671 |
case 'M': return mac_address_string(buf, end, ptr, field_width, precision, flags); |
4aa996066
|
672 673 674 675 676 677 678 679 680 681 |
case 'i': flags |= SPECIAL; /* Fallthrough */ case 'I': if (fmt[1] == '6') return ip6_addr_string(buf, end, ptr, field_width, precision, flags); if (fmt[1] == '4') return ip4_addr_string(buf, end, ptr, field_width, precision, flags); flags &= ~SPECIAL; break; |
0fe1ef24f
|
682 |
} |
78a8bf69b
|
683 684 685 686 687 688 689 |
flags |= SMALL; if (field_width == -1) { field_width = 2*sizeof(void *); flags |= ZEROPAD; } return number(buf, end, (unsigned long) ptr, 16, field_width, precision, flags); } |
1da177e4c
|
690 691 692 693 694 695 696 |
/** * vsnprintf - Format a string and place it in a buffer * @buf: The buffer to place the result into * @size: The size of the buffer, including the trailing null space * @fmt: The format string to use * @args: Arguments for the format string * |
20036fdca
|
697 698 699 |
* This function follows C99 vsnprintf, but has some extensions: * %pS output the name of a text symbol * %pF output the name of a function pointer |
332d2e783
|
700 |
* %pR output the address range in a struct resource |
20036fdca
|
701 |
* |
1da177e4c
|
702 703 704 705 |
* The return value is the number of characters which would * be generated for the given input, excluding the trailing * '\0', as per ISO C99. If you want to have the exact * number of characters written into @buf as return value |
72fd4a35a
|
706 |
* (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4c
|
707 708 709 710 |
* return is greater than or equal to @size, the resulting * string is truncated. * * Call this function if you are already dealing with a va_list. |
72fd4a35a
|
711 |
* You probably want snprintf() instead. |
1da177e4c
|
712 713 714 |
*/ int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) { |
1da177e4c
|
715 |
unsigned long long num; |
0f9bfa569
|
716 |
int base; |
1da177e4c
|
717 |
char *str, *end, c; |
1da177e4c
|
718 719 720 721 722 723 724 725 726 |
int flags; /* flags to number() */ int field_width; /* width of output field */ int precision; /* min. # of digits for integers; max number of chars for from string */ int qualifier; /* 'h', 'l', or 'L' for integer fields */ /* 'z' support added 23/7/1999 S.H. */ /* 'z' changed to 'Z' --davidm 1/25/99 */ |
803223069
|
727 |
/* 't' added for ptrdiff_t */ |
1da177e4c
|
728 |
|
f796937a0
|
729 730 |
/* Reject out-of-range values early. Large positive sizes are used for unknown buffer sizes. */ |
1da177e4c
|
731 732 |
if (unlikely((int) size < 0)) { /* There can be only one.. */ |
b39a73409
|
733 |
static char warn = 1; |
1da177e4c
|
734 735 736 737 738 739 |
WARN_ON(warn); warn = 0; return 0; } str = buf; |
f796937a0
|
740 |
end = buf + size; |
1da177e4c
|
741 |
|
f796937a0
|
742 743 744 745 |
/* Make sure end is always >= buf */ if (end < buf) { end = ((void *)-1); size = end - buf; |
1da177e4c
|
746 747 748 749 |
} for (; *fmt ; ++fmt) { if (*fmt != '%') { |
f796937a0
|
750 |
if (str < end) |
1da177e4c
|
751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 |
*str = *fmt; ++str; continue; } /* process flags */ flags = 0; repeat: ++fmt; /* this also skips first '%' */ switch (*fmt) { case '-': flags |= LEFT; goto repeat; case '+': flags |= PLUS; goto repeat; case ' ': flags |= SPACE; goto repeat; case '#': flags |= SPECIAL; goto repeat; case '0': flags |= ZEROPAD; goto repeat; } /* get field width */ field_width = -1; if (isdigit(*fmt)) field_width = skip_atoi(&fmt); else if (*fmt == '*') { ++fmt; /* it's the next argument */ field_width = va_arg(args, int); if (field_width < 0) { field_width = -field_width; flags |= LEFT; } } /* get the precision */ precision = -1; if (*fmt == '.') { ++fmt; if (isdigit(*fmt)) precision = skip_atoi(&fmt); else if (*fmt == '*') { ++fmt; /* it's the next argument */ precision = va_arg(args, int); } if (precision < 0) precision = 0; } /* get the conversion qualifier */ qualifier = -1; if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || |
803223069
|
800 |
*fmt =='Z' || *fmt == 'z' || *fmt == 't') { |
1da177e4c
|
801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 |
qualifier = *fmt; ++fmt; if (qualifier == 'l' && *fmt == 'l') { qualifier = 'L'; ++fmt; } } /* default base */ base = 10; switch (*fmt) { case 'c': if (!(flags & LEFT)) { while (--field_width > 0) { |
f796937a0
|
816 |
if (str < end) |
1da177e4c
|
817 818 819 820 821 |
*str = ' '; ++str; } } c = (unsigned char) va_arg(args, int); |
f796937a0
|
822 |
if (str < end) |
1da177e4c
|
823 824 825 |
*str = c; ++str; while (--field_width > 0) { |
f796937a0
|
826 |
if (str < end) |
1da177e4c
|
827 828 829 830 831 832 |
*str = ' '; ++str; } continue; case 's': |
0f9bfa569
|
833 |
str = string(str, end, va_arg(args, char *), field_width, precision, flags); |
1da177e4c
|
834 835 836 |
continue; case 'p': |
4d8a743cd
|
837 838 839 840 841 842 |
str = pointer(fmt+1, str, end, va_arg(args, void *), field_width, precision, flags); /* Skip all alphanumeric pointer suffixes */ while (isalnum(fmt[1])) fmt++; |
1da177e4c
|
843 |
continue; |
1da177e4c
|
844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 |
case 'n': /* FIXME: * What does C99 say about the overflow case here? */ if (qualifier == 'l') { long * ip = va_arg(args, long *); *ip = (str - buf); } else if (qualifier == 'Z' || qualifier == 'z') { size_t * ip = va_arg(args, size_t *); *ip = (str - buf); } else { int * ip = va_arg(args, int *); *ip = (str - buf); } continue; case '%': |
f796937a0
|
860 |
if (str < end) |
1da177e4c
|
861 862 863 864 865 866 867 868 |
*str = '%'; ++str; continue; /* integer number formats - set up the flags and "break" */ case 'o': base = 8; break; |
1da177e4c
|
869 |
case 'x': |
9b706aee7
|
870 871 |
flags |= SMALL; case 'X': |
1da177e4c
|
872 873 874 875 876 877 878 879 880 881 |
base = 16; break; case 'd': case 'i': flags |= SIGN; case 'u': break; default: |
f796937a0
|
882 |
if (str < end) |
1da177e4c
|
883 884 885 |
*str = '%'; ++str; if (*fmt) { |
f796937a0
|
886 |
if (str < end) |
1da177e4c
|
887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 |
*str = *fmt; ++str; } else { --fmt; } continue; } if (qualifier == 'L') num = va_arg(args, long long); else if (qualifier == 'l') { num = va_arg(args, unsigned long); if (flags & SIGN) num = (signed long) num; } else if (qualifier == 'Z' || qualifier == 'z') { num = va_arg(args, size_t); |
803223069
|
902 903 |
} else if (qualifier == 't') { num = va_arg(args, ptrdiff_t); |
1da177e4c
|
904 905 906 907 908 909 910 911 912 913 914 915 |
} else if (qualifier == 'h') { num = (unsigned short) va_arg(args, int); if (flags & SIGN) num = (signed short) num; } else { num = va_arg(args, unsigned int); if (flags & SIGN) num = (signed int) num; } str = number(str, end, num, base, field_width, precision, flags); } |
f796937a0
|
916 917 918 919 |
if (size > 0) { if (str < end) *str = '\0'; else |
0a6047eef
|
920 |
end[-1] = '\0'; |
f796937a0
|
921 922 |
} /* the trailing null byte doesn't count towards the total */ |
1da177e4c
|
923 924 |
return str-buf; } |
1da177e4c
|
925 926 927 928 929 930 931 932 933 934 935 936 937 938 |
EXPORT_SYMBOL(vsnprintf); /** * vscnprintf - Format a string and place it in a buffer * @buf: The buffer to place the result into * @size: The size of the buffer, including the trailing null space * @fmt: The format string to use * @args: Arguments for the format string * * The return value is the number of characters which have been written into * the @buf not including the trailing '\0'. If @size is <= 0 the function * returns 0. * * Call this function if you are already dealing with a va_list. |
72fd4a35a
|
939 |
* You probably want scnprintf() instead. |
20036fdca
|
940 941 |
* * See the vsnprintf() documentation for format string extensions over C99. |
1da177e4c
|
942 943 944 945 946 947 948 949 |
*/ int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) { int i; i=vsnprintf(buf,size,fmt,args); return (i >= size) ? (size - 1) : i; } |
1da177e4c
|
950 951 952 953 954 955 956 957 958 959 960 961 962 |
EXPORT_SYMBOL(vscnprintf); /** * snprintf - Format a string and place it in a buffer * @buf: The buffer to place the result into * @size: The size of the buffer, including the trailing null space * @fmt: The format string to use * @...: Arguments for the format string * * The return value is the number of characters which would be * generated for the given input, excluding the trailing null, * as per ISO C99. If the return is greater than or equal to * @size, the resulting string is truncated. |
20036fdca
|
963 964 |
* * See the vsnprintf() documentation for format string extensions over C99. |
1da177e4c
|
965 966 967 968 969 970 971 972 973 974 975 |
*/ int snprintf(char * buf, size_t size, const char *fmt, ...) { va_list args; int i; va_start(args, fmt); i=vsnprintf(buf,size,fmt,args); va_end(args); return i; } |
1da177e4c
|
976 977 978 979 980 981 982 983 984 985 |
EXPORT_SYMBOL(snprintf); /** * scnprintf - Format a string and place it in a buffer * @buf: The buffer to place the result into * @size: The size of the buffer, including the trailing null space * @fmt: The format string to use * @...: Arguments for the format string * * The return value is the number of characters written into @buf not including |
ea6f3281a
|
986 |
* the trailing '\0'. If @size is <= 0 the function returns 0. |
1da177e4c
|
987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 |
*/ int scnprintf(char * buf, size_t size, const char *fmt, ...) { va_list args; int i; va_start(args, fmt); i = vsnprintf(buf, size, fmt, args); va_end(args); return (i >= size) ? (size - 1) : i; } EXPORT_SYMBOL(scnprintf); /** * vsprintf - Format a string and place it in a buffer * @buf: The buffer to place the result into * @fmt: The format string to use * @args: Arguments for the format string * * The function returns the number of characters written |
72fd4a35a
|
1008 |
* into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4c
|
1009 1010 1011 |
* buffer overflows. * * Call this function if you are already dealing with a va_list. |
72fd4a35a
|
1012 |
* You probably want sprintf() instead. |
20036fdca
|
1013 1014 |
* * See the vsnprintf() documentation for format string extensions over C99. |
1da177e4c
|
1015 1016 1017 1018 1019 |
*/ int vsprintf(char *buf, const char *fmt, va_list args) { return vsnprintf(buf, INT_MAX, fmt, args); } |
1da177e4c
|
1020 1021 1022 1023 1024 1025 1026 1027 1028 |
EXPORT_SYMBOL(vsprintf); /** * sprintf - Format a string and place it in a buffer * @buf: The buffer to place the result into * @fmt: The format string to use * @...: Arguments for the format string * * The function returns the number of characters written |
72fd4a35a
|
1029 |
* into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4c
|
1030 |
* buffer overflows. |
20036fdca
|
1031 1032 |
* * See the vsnprintf() documentation for format string extensions over C99. |
1da177e4c
|
1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 |
*/ int sprintf(char * buf, const char *fmt, ...) { va_list args; int i; va_start(args, fmt); i=vsnprintf(buf, INT_MAX, fmt, args); va_end(args); return i; } |
1da177e4c
|
1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 |
EXPORT_SYMBOL(sprintf); /** * vsscanf - Unformat a buffer into a list of arguments * @buf: input buffer * @fmt: format of buffer * @args: arguments */ int vsscanf(const char * buf, const char * fmt, va_list args) { const char *str = buf; char *next; char digit; int num = 0; int qualifier; int base; int field_width; int is_sign = 0; while(*fmt && *str) { /* skip any white space in format */ /* white space in format matchs any amount of * white space, including none, in the input. */ if (isspace(*fmt)) { while (isspace(*fmt)) ++fmt; while (isspace(*str)) ++str; } /* anything that is not a conversion must match exactly */ if (*fmt != '%' && *fmt) { if (*fmt++ != *str++) break; continue; } if (!*fmt) break; ++fmt; /* skip this conversion. * advance both strings to next white space */ if (*fmt == '*') { while (!isspace(*fmt) && *fmt) fmt++; while (!isspace(*str) && *str) str++; continue; } /* get field width */ field_width = -1; if (isdigit(*fmt)) field_width = skip_atoi(&fmt); /* get conversion qualifier */ qualifier = -1; if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || *fmt == 'Z' || *fmt == 'z') { qualifier = *fmt++; if (unlikely(qualifier == *fmt)) { if (qualifier == 'h') { qualifier = 'H'; fmt++; } else if (qualifier == 'l') { qualifier = 'L'; fmt++; } } } base = 10; is_sign = 0; if (!*fmt || !*str) break; switch(*fmt++) { case 'c': { char *s = (char *) va_arg(args,char*); if (field_width == -1) field_width = 1; do { *s++ = *str++; } while (--field_width > 0 && *str); num++; } continue; case 's': { char *s = (char *) va_arg(args, char *); if(field_width == -1) field_width = INT_MAX; /* first, skip leading white space in buffer */ while (isspace(*str)) str++; /* now copy until next white space */ while (*str && !isspace(*str) && field_width--) { *s++ = *str++; } *s = '\0'; num++; } continue; case 'n': /* return number of characters read so far */ { int *i = (int *)va_arg(args,int*); *i = str - buf; } continue; case 'o': base = 8; break; case 'x': case 'X': base = 16; break; case 'i': base = 0; case 'd': is_sign = 1; case 'u': break; case '%': /* looking for '%' in str */ if (*str++ != '%') return num; continue; default: /* invalid format; stop here */ return num; } /* have some sort of integer conversion. * first, skip white space in buffer. */ while (isspace(*str)) str++; digit = *str; if (is_sign && digit == '-') digit = *(str + 1); if (!digit || (base == 16 && !isxdigit(digit)) || (base == 10 && !isdigit(digit)) || (base == 8 && (!isdigit(digit) || digit > '7')) || (base == 0 && !isdigit(digit))) break; switch(qualifier) { case 'H': /* that's 'hh' in format */ if (is_sign) { signed char *s = (signed char *) va_arg(args,signed char *); *s = (signed char) simple_strtol(str,&next,base); } else { unsigned char *s = (unsigned char *) va_arg(args, unsigned char *); *s = (unsigned char) simple_strtoul(str, &next, base); } break; case 'h': if (is_sign) { short *s = (short *) va_arg(args,short *); *s = (short) simple_strtol(str,&next,base); } else { unsigned short *s = (unsigned short *) va_arg(args, unsigned short *); *s = (unsigned short) simple_strtoul(str, &next, base); } break; case 'l': if (is_sign) { long *l = (long *) va_arg(args,long *); *l = simple_strtol(str,&next,base); } else { unsigned long *l = (unsigned long*) va_arg(args,unsigned long*); *l = simple_strtoul(str,&next,base); } break; case 'L': if (is_sign) { long long *l = (long long*) va_arg(args,long long *); *l = simple_strtoll(str,&next,base); } else { unsigned long long *l = (unsigned long long*) va_arg(args,unsigned long long*); *l = simple_strtoull(str,&next,base); } break; case 'Z': case 'z': { size_t *s = (size_t*) va_arg(args,size_t*); *s = (size_t) simple_strtoul(str,&next,base); } break; default: if (is_sign) { int *i = (int *) va_arg(args, int*); *i = (int) simple_strtol(str,&next,base); } else { unsigned int *i = (unsigned int*) va_arg(args, unsigned int*); *i = (unsigned int) simple_strtoul(str,&next,base); } break; } num++; if (!next) break; str = next; } |
c6b40d16d
|
1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 |
/* * Now we've come all the way through so either the input string or the * format ended. In the former case, there can be a %n at the current * position in the format that needs to be filled. */ if (*fmt == '%' && *(fmt + 1) == 'n') { int *p = (int *)va_arg(args, int *); *p = str - buf; } |
1da177e4c
|
1269 1270 |
return num; } |
1da177e4c
|
1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 |
EXPORT_SYMBOL(vsscanf); /** * sscanf - Unformat a buffer into a list of arguments * @buf: input buffer * @fmt: formatting of buffer * @...: resulting arguments */ int sscanf(const char * buf, const char * fmt, ...) { va_list args; int i; va_start(args,fmt); i = vsscanf(buf,fmt,args); va_end(args); return i; } |
1da177e4c
|
1289 |
EXPORT_SYMBOL(sscanf); |