1 /* Reentrant string tokenizer. Generic version. 2 Copyright (C) 1991, 1996-1999, 2001, 2004, 2007, 2009-2021 Free Software 3 Foundation, Inc. 4 This file is part of the GNU C Library. 5 6 This file is free software: you can redistribute it and/or modify 7 it under the terms of the GNU Lesser General Public License as 8 published by the Free Software Foundation; either version 2.1 of the 9 License, or (at your option) any later version. 10 11 This file 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 Lesser General Public License for more details. 15 16 You should have received a copy of the GNU Lesser 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