1 /* $NetBSD: stresep.c,v 1.4 2017/08/23 10:27:41 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #ifdef HAVE_CONFIG_H 33 # include <config.h> 34 #endif 35 36 #include <sys/cdefs.h> 37 38 #include <assert.h> 39 #include <string.h> 40 41 #if !defined(HAVE_STRESEP) 42 char * stresep(char **stringp, const char *delim, int esc); 43 /* 44 * Get next token from string *stringp, where tokens are possibly-empty 45 * strings separated by characters from delim. If esc is not NUL, then 46 * the characters followed by esc are ignored and are not taken into account 47 * when splitting the string. 48 * 49 * Writes NULs into the string at *stringp to end tokens. 50 * delim need not remain constant from call to call. 51 * On return, *stringp points past the last NUL written (if there might 52 * be further tokens), or is NULL (if there are definitely no more tokens). 53 * 54 * If *stringp is NULL, stresep returns NULL. 55 */ 56 char * 57 stresep(char **stringp, const char *delim, int esc) 58 { 59 char *s; 60 const char *spanp; 61 int c, sc; 62 size_t l; 63 char *tok; 64 65 if (stringp == NULL || delim == NULL) 66 return NULL; 67 68 if ((s = *stringp) == NULL) 69 return NULL; 70 l = strlen(s) + 1; 71 for (tok = s;;) { 72 c = *s++; 73 l--; 74 while (esc != '\0' && c == esc) { 75 memmove(s - 1, s, l); 76 c = *s++; 77 l--; 78 } 79 spanp = delim; 80 do { 81 if ((sc = *spanp++) == c) { 82 if (c == '\0') 83 s = NULL; 84 else 85 s[-1] = '\0'; 86 *stringp = s; 87 return tok; 88 } 89 } while (sc != '\0'); 90 } 91 } 92 #endif 93 94