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Annotation of mandoc/compat_getsubopt.c, Revision 1.6

1.6     ! schwarze    1: /*     $Id: compat_getsubopt.c,v 1.5 2014/08/17 20:53:50 schwarze Exp $ */
1.1       kristaps    2: /*     $OpenBSD: getsubopt.c,v 1.4 2005/08/08 08:05:36 espie Exp $     */
                      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:  */
1.6     ! schwarze   32: #include "config.h"
1.1       kristaps   33:
                     34: #include <unistd.h>
                     35: #include <stdlib.h>
                     36: #include <string.h>
                     37:
                     38: int
                     39: getsubopt(char **optionp, char * const *tokens, char **valuep)
                     40: {
                     41:        int cnt;
1.5       schwarze   42:        char *suboptarg;
1.1       kristaps   43:        char *p;
                     44:
                     45:        suboptarg = *valuep = NULL;
                     46:
                     47:        if (!optionp || !*optionp)
                     48:                return(-1);
                     49:
                     50:        /* skip leading white-space, commas */
                     51:        for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
                     52:
                     53:        if (!*p) {
                     54:                *optionp = p;
                     55:                return(-1);
                     56:        }
                     57:
                     58:        /* save the start of the token, and skip the rest of the token. */
                     59:        for (suboptarg = p;
                     60:            *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';);
                     61:
                     62:        if (*p) {
                     63:                /*
                     64:                 * If there's an equals sign, set the value pointer, and
                     65:                 * skip over the value part of the token.  Terminate the
                     66:                 * token.
                     67:                 */
                     68:                if (*p == '=') {
                     69:                        *p = '\0';
                     70:                        for (*valuep = ++p;
                     71:                            *p && *p != ',' && *p != ' ' && *p != '\t'; ++p);
                     72:                        if (*p)
                     73:                                *p++ = '\0';
                     74:                } else
                     75:                        *p++ = '\0';
                     76:                /* Skip any whitespace or commas after this token. */
                     77:                for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
                     78:        }
                     79:
                     80:        /* set optionp for next round. */
                     81:        *optionp = p;
                     82:
                     83:        for (cnt = 0; *tokens; ++tokens, ++cnt)
                     84:                if (!strcmp(suboptarg, *tokens))
                     85:                        return(cnt);
                     86:        return(-1);
                     87: }