104 lines
3.2 KiB
C
104 lines
3.2 KiB
C
/* $NetBSD: getsubopt.c,v 1.8 2004/05/09 19:34:11 kleink Exp $ */
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/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include "namespace.h"
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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/*
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* The SVID interface to getsubopt provides no way of figuring out which
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* part of the suboptions list wasn't matched. This makes error messages
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* tricky... The extern variable suboptarg is a pointer to the token
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* which didn't match.
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*/
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char *suboptarg;
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int
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getsubopt(optionp, tokens, valuep)
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char **optionp, **valuep;
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char * const *tokens;
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{
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int cnt;
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char *p;
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assert(tokens != NULL);
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assert(valuep != NULL);
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/* optionp is tested below */
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suboptarg = *valuep = NULL;
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if (!optionp || !*optionp)
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return(-1);
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/* skip leading white-space, commas */
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for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
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if (!*p) {
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*optionp = p;
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return(-1);
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}
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/* save the start of the token, and skip the rest of the token. */
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for (suboptarg = p;
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*++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';);
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if (*p) {
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/*
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* If there's an equals sign, set the value pointer, and
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* skip over the value part of the token. Terminate the
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* token.
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*/
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if (*p == '=') {
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*p = '\0';
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for (*valuep = ++p;
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*p && *p != ',' && *p != ' ' && *p != '\t'; ++p);
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if (*p)
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*p++ = '\0';
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} else
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*p++ = '\0';
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/* Skip any whitespace or commas after this token. */
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for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
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}
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/* set optionp for next round. */
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*optionp = p;
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for (cnt = 0; *tokens; ++tokens, ++cnt)
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if (!strcmp(suboptarg, *tokens))
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return(cnt);
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return(-1);
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}
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