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scoutos / prex-0.9.0 / usr / lib / libc / stdlib / getsubopt.c @ 03e9c04a

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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 <unistd.h>
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#include <stdlib.h>
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#include <string.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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        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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}