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glibc/string/strtok_r.c
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/* Reentrant string tokenizer. Generic version. | |
Copyright (C) 1991-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#ifdef HAVE_CONFIG_H | |
# include <config.h> | |
#endif | |
#include <string.h> | |
#undef strtok_r | |
#undef __strtok_r | |
#ifndef _LIBC | |
/* Get specification. */ | |
# include "strtok_r.h" | |
# define __strtok_r strtok_r | |
# define __rawmemchr strchr | |
#endif | |
/* Parse S into tokens separated by characters in DELIM. | |
If S is NULL, the saved pointer in SAVE_PTR is used as | |
the next starting point. For example: | |
char s[] = "-abc-=-def"; | |
char *sp; | |
x = strtok_r(s, "-", &sp); // x = "abc", sp = "=-def" | |
x = strtok_r(NULL, "-=", &sp); // x = "def", sp = NULL | |
x = strtok_r(NULL, "=", &sp); // x = NULL | |
// s = "abc\0-def\0" | |
*/ | |
char * | |
__strtok_r (char *s, const char *delim, char **save_ptr) | |
{ | |
char *token; | |
if (s == NULL) | |
s = *save_ptr; | |
/* Scan leading delimiters. */ | |
s += strspn (s, delim); | |
if (*s == '\0') | |
{ | |
*save_ptr = s; | |
return NULL; | |
} | |
/* Find the end of the token. */ | |
token = s; | |
s = strpbrk (token, delim); | |
if (s == NULL) | |
/* This token finishes the string. */ | |
*save_ptr = __rawmemchr (token, '\0'); | |
else | |
{ | |
/* Terminate the token and make *SAVE_PTR point past it. */ | |
*s = '\0'; | |
*save_ptr = s + 1; | |
} | |
return token; | |
} | |
#ifdef weak_alias | |
libc_hidden_def (__strtok_r) | |
weak_alias (__strtok_r, strtok_r) | |
#endif |