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Annotation of mandoc/compat_getsubopt.c, Revision 1.2

1.2     ! kristaps    1: #ifdef HAVE_CONFIG_H
        !             2: #include "config.h"
        !             3: #endif
        !             4:
1.1       kristaps    5: #ifdef HAVE_GETSUBOPT
                      6:
                      7: int dummy;
                      8:
                      9: #else
                     10:
                     11: /*     $OpenBSD: getsubopt.c,v 1.4 2005/08/08 08:05:36 espie Exp $     */
                     12:
                     13: /*-
                     14:  * Copyright (c) 1990, 1993
                     15:  *     The Regents of the University of California.  All rights reserved.
                     16:  *
                     17:  * Redistribution and use in source and binary forms, with or without
                     18:  * modification, are permitted provided that the following conditions
                     19:  * are met:
                     20:  * 1. Redistributions of source code must retain the above copyright
                     21:  *    notice, this list of conditions and the following disclaimer.
                     22:  * 2. Redistributions in binary form must reproduce the above copyright
                     23:  *    notice, this list of conditions and the following disclaimer in the
                     24:  *    documentation and/or other materials provided with the distribution.
                     25:  * 3. Neither the name of the University nor the names of its contributors
                     26:  *    may be used to endorse or promote products derived from this software
                     27:  *    without specific prior written permission.
                     28:  *
                     29:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     30:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     31:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     32:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     33:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     34:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     35:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     36:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     37:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     38:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     39:  * SUCH DAMAGE.
                     40:  */
                     41:
                     42: #include <unistd.h>
                     43: #include <stdlib.h>
                     44: #include <string.h>
                     45:
                     46: /*
                     47:  * The SVID interface to getsubopt provides no way of figuring out which
                     48:  * part of the suboptions list wasn't matched.  This makes error messages
                     49:  * tricky...  The extern variable suboptarg is a pointer to the token
                     50:  * which didn't match.
                     51:  */
                     52: char *suboptarg;
                     53:
                     54: int
                     55: getsubopt(char **optionp, char * const *tokens, char **valuep)
                     56: {
                     57:        int cnt;
                     58:        char *p;
                     59:
                     60:        suboptarg = *valuep = NULL;
                     61:
                     62:        if (!optionp || !*optionp)
                     63:                return(-1);
                     64:
                     65:        /* skip leading white-space, commas */
                     66:        for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
                     67:
                     68:        if (!*p) {
                     69:                *optionp = p;
                     70:                return(-1);
                     71:        }
                     72:
                     73:        /* save the start of the token, and skip the rest of the token. */
                     74:        for (suboptarg = p;
                     75:            *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';);
                     76:
                     77:        if (*p) {
                     78:                /*
                     79:                 * If there's an equals sign, set the value pointer, and
                     80:                 * skip over the value part of the token.  Terminate the
                     81:                 * token.
                     82:                 */
                     83:                if (*p == '=') {
                     84:                        *p = '\0';
                     85:                        for (*valuep = ++p;
                     86:                            *p && *p != ',' && *p != ' ' && *p != '\t'; ++p);
                     87:                        if (*p)
                     88:                                *p++ = '\0';
                     89:                } else
                     90:                        *p++ = '\0';
                     91:                /* Skip any whitespace or commas after this token. */
                     92:                for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
                     93:        }
                     94:
                     95:        /* set optionp for next round. */
                     96:        *optionp = p;
                     97:
                     98:        for (cnt = 0; *tokens; ++tokens, ++cnt)
                     99:                if (!strcmp(suboptarg, *tokens))
                    100:                        return(cnt);
                    101:        return(-1);
                    102: }
                    103:
                    104: #endif

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