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Annotation of prex-old/usr/lib/libc/stdlib/getsubopt.c, Revision 1.1.1.1

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: }