1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1998 Softweyr LLC. All rights reserved. 5 * 6 * strtok_r, from Berkeley strtok 7 * Oct 13, 1998 by Wes Peters <wes@softweyr.com> 8 * 9 * Copyright (c) 1988, 1993 10 * The Regents of the University of California. All rights reserved. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notices, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notices, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY SOFTWEYR LLC, THE REGENTS AND CONTRIBUTORS 25 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 26 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 27 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SOFTWEYR LLC, THE 28 * REGENTS, OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 29 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 30 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 31 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 32 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 33 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 35 */ 36 37 #include <string.h> 38 39 char * 40 strtok_r(char *s, const char *delim, char **last) 41 { 42 char *spanp, *tok; 43 int c, sc; 44 45 if (s == NULL && (s = *last) == NULL) 46 return (NULL); 47 48 /* 49 * Skip (span) leading delimiters (s += strspn(s, delim), sort of). 50 */ 51 cont: 52 c = *s++; 53 for (spanp = (char *)delim; (sc = *spanp++) != 0;) { 54 if (c == sc) 55 goto cont; 56 } 57 58 if (c == 0) { /* no non-delimiter characters */ 59 *last = NULL; 60 return (NULL); 61 } 62 tok = s - 1; 63 64 /* 65 * Scan token (scan for delimiters: s += strcspn(s, delim), sort of). 66 * Note that delim must have one NUL; we stop if we see that, too. 67 */ 68 for (;;) { 69 c = *s++; 70 spanp = (char *)delim; 71 do { 72 if ((sc = *spanp++) == c) { 73 if (c == 0) 74 s = NULL; 75 else 76 s[-1] = '\0'; 77 *last = s; 78 return (tok); 79 } 80 } while (sc != 0); 81 } 82 /* NOTREACHED */ 83 } 84