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Annotation of mandoc/compat_getsubopt.c, Revision 1.1

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

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