1 /* $NetBSD: stresep.c,v 1.2 2007/12/06 22:07:07 seb 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 #include <sys/cdefs.h> 33 #if defined(LIBC_SCCS) && !defined(lint) 34 #if 0 35 static char sccsid[] = "@(#)strsep.c 8.1 (Berkeley) 6/4/93"; 36 #else 37 __RCSID("$NetBSD: stresep.c,v 1.2 2007/12/06 22:07:07 seb Exp $"); 38 #endif 39 #endif /* LIBC_SCCS and not lint */ 40 41 #include "namespace.h" 42 43 #include <assert.h> 44 #include <string.h> 45 46 #ifdef __weak_alias 47 __weak_alias(stresep,_stresep) 48 #endif 49 50 /* 51 * Get next token from string *stringp, where tokens are possibly-empty 52 * strings separated by characters from delim. If esc is not NUL, then 53 * the characters followed by esc are ignored and are not taken into account 54 * when splitting the string. 55 * 56 * Writes NULs into the string at *stringp to end tokens. 57 * delim need not remain constant from call to call. 58 * On return, *stringp points past the last NUL written (if there might 59 * be further tokens), or is NULL (if there are definitely no more tokens). 60 * 61 * If *stringp is NULL, stresep returns NULL. 62 */ 63 char * 64 stresep(char **stringp, const char *delim, int esc) 65 { 66 char *s; 67 const char *spanp; 68 int c, sc; 69 char *tok; 70 71 _DIAGASSERT(stringp != NULL); 72 _DIAGASSERT(delim != NULL); 73 74 if ((s = *stringp) == NULL) 75 return NULL; 76 for (tok = s;;) { 77 c = *s++; 78 while (esc != '\0' && c == esc) { 79 (void)strcpy(s - 1, s); 80 c = *s++; 81 } 82 spanp = delim; 83 do { 84 if ((sc = *spanp++) == c) { 85 if (c == 0) 86 s = NULL; 87 else 88 s[-1] = 0; 89 *stringp = s; 90 return tok; 91 } 92 } while (sc != 0); 93 } 94 } 95