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Annotation of mandoc/compat_strsep.c, Revision 1.6

1.6     ! schwarze    1: /*     $Id: compat_strsep.c,v 1.5 2020/06/15 01:37:15 schwarze Exp $   */
1.5       schwarze    2: /*     $OpenBSD: strsep.c,v 1.8 2015/08/31 02:53:57 guenther Exp $     */
1.1       schwarze    3:
                      4: /*-
                      5:  * Copyright (c) 1990, 1993
                      6:  *     The Regents of the University of California.  All rights reserved.
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. Neither the name of the University nor the names of its contributors
                     17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
                     19:  *
                     20:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  */
1.5       schwarze   32: #include "config.h"
1.6     ! schwarze   33:
        !            34: #include <stddef.h>
1.1       schwarze   35:
                     36: /*
                     37:  * Get next token from string *stringp, where tokens are possibly-empty
                     38:  * strings separated by characters from delim.
                     39:  *
                     40:  * Writes NULs into the string at *stringp to end tokens.
                     41:  * delim need not remain constant from call to call.
                     42:  * On return, *stringp points past the last NUL written (if there might
                     43:  * be further tokens), or is NULL (if there are definitely no more tokens).
                     44:  *
                     45:  * If *stringp is NULL, strsep returns NULL.
                     46:  */
                     47: char *
                     48: strsep(char **stringp, const char *delim)
                     49: {
                     50:        char *s;
                     51:        const char *spanp;
                     52:        int c, sc;
                     53:        char *tok;
                     54:
                     55:        if ((s = *stringp) == NULL)
                     56:                return (NULL);
                     57:        for (tok = s;;) {
                     58:                c = *s++;
                     59:                spanp = delim;
                     60:                do {
                     61:                        if ((sc = *spanp++) == c) {
                     62:                                if (c == 0)
                     63:                                        s = NULL;
                     64:                                else
                     65:                                        s[-1] = 0;
                     66:                                *stringp = s;
                     67:                                return (tok);
                     68:                        }
                     69:                } while (sc != 0);
                     70:        }
                     71:        /* NOTREACHED */
                     72: }