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Annotation of mandoc/compat_getsubopt.c, Revision 1.3

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

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