![Martin Peschke](/assets/img/avatar_default.png)
The return value of scnprintf() never exceeds @size. Signed-off-by: Martin Peschke <mp3@de.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
874 lines
19 KiB
C
874 lines
19 KiB
C
/*
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* linux/lib/vsprintf.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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/* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
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/*
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* Wirzenius wrote this portably, Torvalds fucked it up :-)
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*/
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/*
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* Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com>
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* - changed to provide snprintf and vsnprintf functions
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* So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de>
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* - scnprintf and vscnprintf
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*/
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#include <stdarg.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/ctype.h>
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#include <linux/kernel.h>
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#include <asm/page.h> /* for PAGE_SIZE */
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#include <asm/div64.h>
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/**
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* simple_strtoul - convert a string to an unsigned long
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* @cp: The start of the string
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* @endp: A pointer to the end of the parsed string will be placed here
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* @base: The number base to use
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*/
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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,value;
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if (!base) {
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base = 10;
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if (*cp == '0') {
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base = 8;
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cp++;
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if ((toupper(*cp) == 'X') && isxdigit(cp[1])) {
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cp++;
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base = 16;
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}
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}
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} else if (base == 16) {
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if (cp[0] == '0' && toupper(cp[1]) == 'X')
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cp += 2;
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}
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while (isxdigit(*cp) &&
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(value = isdigit(*cp) ? *cp-'0' : toupper(*cp)-'A'+10) < base) {
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result = result*base + value;
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cp++;
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}
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if (endp)
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*endp = (char *)cp;
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return result;
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}
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EXPORT_SYMBOL(simple_strtoul);
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/**
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* simple_strtol - convert a string to a signed long
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* @cp: The start of the string
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* @endp: A pointer to the end of the parsed string will be placed here
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* @base: The number base to use
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*/
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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=='-')
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return -simple_strtoul(cp+1,endp,base);
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return simple_strtoul(cp,endp,base);
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}
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EXPORT_SYMBOL(simple_strtol);
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/**
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* simple_strtoull - convert a string to an unsigned long long
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* @cp: The start of the string
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* @endp: A pointer to the end of the parsed string will be placed here
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* @base: The number base to use
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*/
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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,value;
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if (!base) {
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base = 10;
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if (*cp == '0') {
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base = 8;
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cp++;
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if ((toupper(*cp) == 'X') && isxdigit(cp[1])) {
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cp++;
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base = 16;
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}
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}
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} else if (base == 16) {
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if (cp[0] == '0' && toupper(cp[1]) == 'X')
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cp += 2;
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}
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while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp)
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? toupper(*cp) : *cp)-'A'+10) < base) {
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result = result*base + value;
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cp++;
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}
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if (endp)
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*endp = (char *)cp;
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return result;
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}
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EXPORT_SYMBOL(simple_strtoull);
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/**
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* simple_strtoll - convert a string to a signed long long
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* @cp: The start of the string
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* @endp: A pointer to the end of the parsed string will be placed here
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* @base: The number base to use
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*/
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long long simple_strtoll(const char *cp,char **endp,unsigned int base)
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{
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if(*cp=='-')
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return -simple_strtoull(cp+1,endp,base);
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return simple_strtoull(cp,endp,base);
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}
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static int skip_atoi(const char **s)
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{
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int i=0;
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while (isdigit(**s))
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i = i*10 + *((*s)++) - '0';
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return i;
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}
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#define ZEROPAD 1 /* pad with zero */
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#define SIGN 2 /* unsigned/signed long */
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#define PLUS 4 /* show plus */
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#define SPACE 8 /* space if plus */
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#define LEFT 16 /* left justified */
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#define SPECIAL 32 /* 0x */
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#define LARGE 64 /* use 'ABCDEF' instead of 'abcdef' */
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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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char c,sign,tmp[66];
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const char *digits;
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static const char small_digits[] = "0123456789abcdefghijklmnopqrstuvwxyz";
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static const char large_digits[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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int i;
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digits = (type & LARGE) ? large_digits : small_digits;
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if (type & LEFT)
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type &= ~ZEROPAD;
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if (base < 2 || base > 36)
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return NULL;
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c = (type & ZEROPAD) ? '0' : ' ';
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sign = 0;
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if (type & SIGN) {
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if ((signed long long) num < 0) {
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sign = '-';
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num = - (signed long long) num;
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size--;
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} else if (type & PLUS) {
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sign = '+';
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size--;
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} else if (type & SPACE) {
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sign = ' ';
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size--;
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}
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}
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if (type & SPECIAL) {
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if (base == 16)
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size -= 2;
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else if (base == 8)
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size--;
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}
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i = 0;
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if (num == 0)
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tmp[i++]='0';
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else while (num != 0)
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tmp[i++] = digits[do_div(num,base)];
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if (i > precision)
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precision = i;
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size -= precision;
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if (!(type&(ZEROPAD+LEFT))) {
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while(size-->0) {
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if (buf < end)
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*buf = ' ';
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++buf;
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}
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}
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if (sign) {
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if (buf < end)
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*buf = sign;
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++buf;
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}
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if (type & SPECIAL) {
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if (base==8) {
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if (buf < end)
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*buf = '0';
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++buf;
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} else if (base==16) {
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if (buf < end)
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*buf = '0';
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++buf;
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if (buf < end)
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*buf = digits[33];
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++buf;
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}
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}
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if (!(type & LEFT)) {
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while (size-- > 0) {
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if (buf < end)
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*buf = c;
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++buf;
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}
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}
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while (i < precision--) {
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if (buf < end)
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*buf = '0';
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++buf;
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}
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while (i-- > 0) {
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if (buf < end)
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*buf = tmp[i];
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++buf;
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}
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while (size-- > 0) {
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if (buf < end)
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*buf = ' ';
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++buf;
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}
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return buf;
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}
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/**
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* vsnprintf - Format a string and place it in a buffer
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* @buf: The buffer to place the result into
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* @size: The size of the buffer, including the trailing null space
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* @fmt: The format string to use
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* @args: Arguments for the format string
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*
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* The return value is the number of characters which would
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* be generated for the given input, excluding the trailing
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* '\0', as per ISO C99. If you want to have the exact
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* number of characters written into @buf as return value
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* (not including the trailing '\0'), use vscnprintf(). If the
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* return is greater than or equal to @size, the resulting
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* string is truncated.
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*
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* Call this function if you are already dealing with a va_list.
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* You probably want snprintf() instead.
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*/
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int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
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{
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int len;
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unsigned long long num;
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int i, base;
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char *str, *end, c;
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const char *s;
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int flags; /* flags to number() */
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int field_width; /* width of output field */
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int precision; /* min. # of digits for integers; max
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number of chars for from string */
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int qualifier; /* 'h', 'l', or 'L' for integer fields */
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/* 'z' support added 23/7/1999 S.H. */
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/* 'z' changed to 'Z' --davidm 1/25/99 */
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/* 't' added for ptrdiff_t */
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/* Reject out-of-range values early. Large positive sizes are
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used for unknown buffer sizes. */
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if (unlikely((int) size < 0)) {
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/* There can be only one.. */
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static int warn = 1;
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WARN_ON(warn);
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warn = 0;
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return 0;
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}
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str = buf;
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end = buf + size;
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/* Make sure end is always >= buf */
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if (end < buf) {
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end = ((void *)-1);
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size = end - buf;
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}
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for (; *fmt ; ++fmt) {
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if (*fmt != '%') {
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if (str < end)
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*str = *fmt;
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++str;
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continue;
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}
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/* process flags */
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flags = 0;
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repeat:
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++fmt; /* this also skips first '%' */
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switch (*fmt) {
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case '-': flags |= LEFT; goto repeat;
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case '+': flags |= PLUS; goto repeat;
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case ' ': flags |= SPACE; goto repeat;
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case '#': flags |= SPECIAL; goto repeat;
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case '0': flags |= ZEROPAD; goto repeat;
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}
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/* get field width */
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field_width = -1;
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if (isdigit(*fmt))
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field_width = skip_atoi(&fmt);
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else if (*fmt == '*') {
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++fmt;
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/* it's the next argument */
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field_width = va_arg(args, int);
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if (field_width < 0) {
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field_width = -field_width;
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flags |= LEFT;
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}
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}
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/* get the precision */
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precision = -1;
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if (*fmt == '.') {
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++fmt;
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if (isdigit(*fmt))
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precision = skip_atoi(&fmt);
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else if (*fmt == '*') {
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++fmt;
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/* it's the next argument */
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precision = va_arg(args, int);
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}
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if (precision < 0)
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precision = 0;
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}
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/* get the conversion qualifier */
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qualifier = -1;
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if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
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*fmt =='Z' || *fmt == 'z' || *fmt == 't') {
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qualifier = *fmt;
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++fmt;
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if (qualifier == 'l' && *fmt == 'l') {
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qualifier = 'L';
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++fmt;
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}
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}
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/* default base */
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base = 10;
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switch (*fmt) {
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case 'c':
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if (!(flags & LEFT)) {
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while (--field_width > 0) {
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if (str < end)
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*str = ' ';
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++str;
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}
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}
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c = (unsigned char) va_arg(args, int);
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if (str < end)
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*str = c;
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++str;
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while (--field_width > 0) {
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if (str < end)
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*str = ' ';
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++str;
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}
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continue;
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case 's':
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s = va_arg(args, char *);
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if ((unsigned long)s < PAGE_SIZE)
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s = "<NULL>";
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len = strnlen(s, precision);
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if (!(flags & LEFT)) {
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while (len < field_width--) {
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if (str < end)
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*str = ' ';
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++str;
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}
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}
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for (i = 0; i < len; ++i) {
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if (str < end)
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*str = *s;
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++str; ++s;
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}
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while (len < field_width--) {
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if (str < end)
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*str = ' ';
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++str;
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}
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continue;
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case 'p':
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if (field_width == -1) {
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field_width = 2*sizeof(void *);
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flags |= ZEROPAD;
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}
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str = number(str, end,
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(unsigned long) va_arg(args, void *),
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16, field_width, precision, flags);
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continue;
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case 'n':
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/* FIXME:
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* What does C99 say about the overflow case here? */
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if (qualifier == 'l') {
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long * ip = va_arg(args, long *);
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*ip = (str - buf);
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} else if (qualifier == 'Z' || qualifier == 'z') {
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size_t * ip = va_arg(args, size_t *);
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*ip = (str - buf);
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} else {
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int * ip = va_arg(args, int *);
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*ip = (str - buf);
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}
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continue;
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case '%':
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if (str < end)
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*str = '%';
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++str;
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continue;
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/* integer number formats - set up the flags and "break" */
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case 'o':
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base = 8;
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break;
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case 'X':
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flags |= LARGE;
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case 'x':
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base = 16;
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break;
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case 'd':
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case 'i':
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flags |= SIGN;
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case 'u':
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break;
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default:
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if (str < end)
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*str = '%';
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++str;
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if (*fmt) {
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if (str < end)
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*str = *fmt;
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++str;
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} else {
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--fmt;
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}
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continue;
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}
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if (qualifier == 'L')
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num = va_arg(args, long long);
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else if (qualifier == 'l') {
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num = va_arg(args, unsigned long);
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if (flags & SIGN)
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num = (signed long) num;
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} else if (qualifier == 'Z' || qualifier == 'z') {
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num = va_arg(args, size_t);
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} else if (qualifier == 't') {
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num = va_arg(args, ptrdiff_t);
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} else if (qualifier == 'h') {
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num = (unsigned short) va_arg(args, int);
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if (flags & SIGN)
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num = (signed short) num;
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} else {
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num = va_arg(args, unsigned int);
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if (flags & SIGN)
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num = (signed int) num;
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}
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str = number(str, end, num, base,
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field_width, precision, flags);
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}
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if (size > 0) {
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if (str < end)
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*str = '\0';
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else
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end[-1] = '\0';
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}
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/* the trailing null byte doesn't count towards the total */
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return str-buf;
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}
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EXPORT_SYMBOL(vsnprintf);
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/**
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* vscnprintf - Format a string and place it in a buffer
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* @buf: The buffer to place the result into
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* @size: The size of the buffer, including the trailing null space
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* @fmt: The format string to use
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* @args: Arguments for the format string
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*
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* The return value is the number of characters which have been written into
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* the @buf not including the trailing '\0'. If @size is <= 0 the function
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* returns 0.
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*
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* Call this function if you are already dealing with a va_list.
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* You probably want scnprintf() instead.
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*/
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int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
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{
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int i;
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i=vsnprintf(buf,size,fmt,args);
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return (i >= size) ? (size - 1) : i;
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}
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EXPORT_SYMBOL(vscnprintf);
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/**
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* snprintf - Format a string and place it in a buffer
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* @buf: The buffer to place the result into
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* @size: The size of the buffer, including the trailing null space
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* @fmt: The format string to use
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* @...: Arguments for the format string
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*
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* The return value is the number of characters which would be
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* generated for the given input, excluding the trailing null,
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* as per ISO C99. If the return is greater than or equal to
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* @size, the resulting string is truncated.
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*/
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int snprintf(char * buf, size_t size, const char *fmt, ...)
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{
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va_list args;
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int i;
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va_start(args, fmt);
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i=vsnprintf(buf,size,fmt,args);
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va_end(args);
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return i;
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}
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EXPORT_SYMBOL(snprintf);
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/**
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* scnprintf - Format a string and place it in a buffer
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* @buf: The buffer to place the result into
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* @size: The size of the buffer, including the trailing null space
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* @fmt: The format string to use
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* @...: Arguments for the format string
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*
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* The return value is the number of characters written into @buf not including
|
|
* the trailing '\0'. If @size is <= 0 the function returns 0.
|
|
*/
|
|
|
|
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
|
|
* into @buf. Use vsnprintf() or vscnprintf() in order to avoid
|
|
* buffer overflows.
|
|
*
|
|
* Call this function if you are already dealing with a va_list.
|
|
* You probably want sprintf() instead.
|
|
*/
|
|
int vsprintf(char *buf, const char *fmt, va_list args)
|
|
{
|
|
return vsnprintf(buf, INT_MAX, fmt, args);
|
|
}
|
|
|
|
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
|
|
* into @buf. Use snprintf() or scnprintf() in order to avoid
|
|
* buffer overflows.
|
|
*/
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
return num;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
EXPORT_SYMBOL(sscanf);
|
|
|
|
|
|
/* Simplified asprintf. */
|
|
char *kasprintf(gfp_t gfp, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
unsigned int len;
|
|
char *p;
|
|
|
|
va_start(ap, fmt);
|
|
len = vsnprintf(NULL, 0, fmt, ap);
|
|
va_end(ap);
|
|
|
|
p = kmalloc(len+1, gfp);
|
|
if (!p)
|
|
return NULL;
|
|
va_start(ap, fmt);
|
|
vsnprintf(p, len+1, fmt, ap);
|
|
va_end(ap);
|
|
return p;
|
|
}
|
|
|
|
EXPORT_SYMBOL(kasprintf);
|