| 1 | /* Reentrant string tokenizer. Generic version. |
| 2 | Copyright (C) 1991, 1996-1999, 2001, 2004, 2007, 2009-2019 Free Software |
| 3 | Foundation, Inc. |
| 4 | This file is part of the GNU C Library. |
| 5 | |
| 6 | This program is free software: you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 3 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #ifdef HAVE_CONFIG_H |
| 20 | # include <config.h> |
| 21 | #endif |
| 22 | |
| 23 | #include <string.h> |
| 24 | |
| 25 | #ifdef _LIBC |
| 26 | # undef strtok_r |
| 27 | # undef __strtok_r |
| 28 | #else |
| 29 | # define __strtok_r strtok_r |
| 30 | # define __rawmemchr strchr |
| 31 | #endif |
| 32 | |
| 33 | /* Parse S into tokens separated by characters in DELIM. |
| 34 | If S is NULL, the saved pointer in SAVE_PTR is used as |
| 35 | the next starting point. For example: |
| 36 | char s[] = "-abc-=-def"; |
| 37 | char *sp; |
| 38 | x = strtok_r(s, "-", &sp); // x = "abc", sp = "=-def" |
| 39 | x = strtok_r(NULL, "-=", &sp); // x = "def", sp = NULL |
| 40 | x = strtok_r(NULL, "=", &sp); // x = NULL |
| 41 | // s = "abc\0-def\0" |
| 42 | */ |
| 43 | char * |
| 44 | __strtok_r (char *s, const char *delim, char **save_ptr) |
| 45 | { |
| 46 | char *token; |
| 47 | |
| 48 | if (s == NULL) |
| 49 | s = *save_ptr; |
| 50 | |
| 51 | /* Scan leading delimiters. */ |
| 52 | s += strspn (s, delim); |
| 53 | if (*s == '\0') |
| 54 | { |
| 55 | *save_ptr = s; |
| 56 | return NULL; |
| 57 | } |
| 58 | |
| 59 | /* Find the end of the token. */ |
| 60 | token = s; |
| 61 | s = strpbrk (token, delim); |
| 62 | if (s == NULL) |
| 63 | /* This token finishes the string. */ |
| 64 | *save_ptr = __rawmemchr (token, '\0'); |
| 65 | else |
| 66 | { |
| 67 | /* Terminate the token and make *SAVE_PTR point past it. */ |
| 68 | *s = '\0'; |
| 69 | *save_ptr = s + 1; |
| 70 | } |
| 71 | return token; |
| 72 | } |
| 73 | #ifdef weak_alias |
| 74 | libc_hidden_def (__strtok_r) |
| 75 | weak_alias (__strtok_r, strtok_r) |
| 76 | #endif |