1 /* $OpenBSD: strsep.c,v 1.8 2015/08/31 02:53:57 guenther 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 <string.h> 33 34 /* 35 * Get next token from string *stringp, where tokens are possibly-empty 36 * strings separated by characters from delim. 37 * 38 * Writes NULs into the string at *stringp to end tokens. 39 * delim need not remain constant from call to call. 40 * On return, *stringp points past the last NUL written (if there might 41 * be further tokens), or is NULL (if there are definitely no more tokens). 42 * 43 * If *stringp is NULL, strsep returns NULL. 44 */ 45 char * 46 strsep(char **stringp, const char *delim) 47 { 48 char *s; 49 const char *spanp; 50 int c, sc; 51 char *tok; 52 53 if ((s = *stringp) == NULL) 54 return (NULL); 55 for (tok = s;;) { 56 c = *s++; 57 spanp = delim; 58 do { 59 if ((sc = *spanp++) == c) { 60 if (c == 0) 61 s = NULL; 62 else 63 s[-1] = 0; 64 *stringp = s; 65 return (tok); 66 } 67 } while (sc != 0); 68 } 69 /* NOTREACHED */ 70 } 71 DEF_WEAK(strsep); 72
