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Annotation of prex-old/usr/lib/libc/stdlib/getsubopt.c, Revision 1.1

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