2.11BSD#431 - /usr/src/lib/libc/stdlib/getsubopt.c

   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. All advertising materials mentioning features or use of this software
  14:  *    must display the following acknowledgement:
  15:  *	This product includes software developed by the University of
  16:  *	California, Berkeley and its contributors.
  17:  * 4. Neither the name of the University nor the names of its contributors
  18:  *    may be used to endorse or promote products derived from this software
  19:  *    without specific prior written permission.
  20:  *
  21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31:  * SUCH DAMAGE.
  32:  */
  33: 
  34: #if defined(DOSCCS) && !defined(lint)
  35: static char sccsid[] = "@(#)getsubopt.c	8.1.1 (2.11BSD) 1996/1/11";
  36: #endif /* not lint */
  37: 
  38: #include <stdlib.h>
  39: 
  40: /*
  41:  * The SVID interface to getsubopt provides no way of figuring out which
  42:  * part of the suboptions list wasn't matched.  This makes error messages
  43:  * tricky...  The extern variable suboptarg is a pointer to the token
  44:  * which didn't match.
  45:  */
  46: char *suboptarg;
  47: 
  48: getsubopt(optionp, tokens, valuep)
  49:     register char **optionp, **valuep;
  50:     register char **tokens;
  51: {
  52:     register int cnt;
  53:     register char *p;
  54: 
  55:     suboptarg = *valuep = NULL;
  56: 
  57:     if (!optionp || !*optionp)
  58:         return(-1);
  59: 
  60:     /* skip leading white-space, commas */
  61:     for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
  62: 
  63:     if (!*p) {
  64:         *optionp = p;
  65:         return(-1);
  66:     }
  67: 
  68:     /* save the start of the token, and skip the rest of the token. */
  69:     for (suboptarg = p;
  70:         *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';);
  71: 
  72:     if (*p) {
  73:         /*
  74: 		 * If there's an equals sign, set the value pointer, and
  75: 		 * skip over the value part of the token.  Terminate the
  76: 		 * token.
  77: 		 */
  78:         if (*p == '=') {
  79:             *p = '\0';
  80:             for (*valuep = ++p;
  81:                 *p && *p != ',' && *p != ' ' && *p != '\t'; ++p);
  82:             if (*p)
  83:                 *p++ = '\0';
  84:         } else
  85:             *p++ = '\0';
  86:         /* Skip any whitespace or commas after this token. */
  87:         for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
  88:     }
  89: 
  90:     /* set optionp for next round. */
  91:     *optionp = p;
  92: 
  93:     for (cnt = 0; *tokens; ++tokens, ++cnt)
  94:         if (!strcmp(suboptarg, *tokens))
  95:             return(cnt);
  96:     return(-1);
  97: }

Defined functions

Defined variables