Annotation of prex/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: }
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