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

   1: /*
   2:  * Copyright (c) 1987, 1993, 1994
   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(LIBC_SCCS) && !defined(lint)
  35: static char sccsid[] = "@(#)getopt.c	8.2.1 (2.11BSD) 1996/1/11";
  36: #endif /* LIBC_SCCS and not lint */
  37: 
  38: #include <stdio.h>
  39: #include <stdlib.h>
  40: #include <string.h>
  41: 
  42: int opterr = 1,     /* if error message should be printed */
  43:     optind = 1,     /* index into parent argv vector */
  44:     optopt,         /* character checked for validity */
  45:     optreset;       /* reset getopt */
  46: char    *optarg;        /* argument associated with option */
  47: 
  48: #define BADCH   (int)'?'
  49: #define BADARG  (int)':'
  50: #define EMSG    ""
  51: 
  52: /*
  53:  * getopt --
  54:  *	Parse argc/argv argument vector.
  55:  */
  56: int
  57: getopt(nargc, nargv, ostr)
  58:     int nargc;
  59:     char **nargv;
  60:     char *ostr;
  61: {
  62:     extern char *__progname;
  63:     static char *place = EMSG;      /* option letter processing */
  64:     char *oli;              /* option letter list index */
  65: 
  66:     if (optreset || !*place) {      /* update scanning pointer */
  67:         optreset = 0;
  68:         if (optind >= nargc || *(place = nargv[optind]) != '-') {
  69:             place = EMSG;
  70:             return (EOF);
  71:         }
  72:         if (place[1] && *++place == '-') {  /* found "--" */
  73:             ++optind;
  74:             place = EMSG;
  75:             return (EOF);
  76:         }
  77:     }                   /* option letter okay? */
  78:     if ((optopt = (int)*place++) == (int)':' ||
  79:         !(oli = strchr(ostr, optopt))) {
  80:         /*
  81: 		 * if the user didn't specify '-' as an option,
  82: 		 * assume it means EOF.
  83: 		 */
  84:         if (optopt == (int)'-')
  85:             return (EOF);
  86:         if (!*place)
  87:             ++optind;
  88:         if (opterr && *ostr != ':')
  89:             (void)fprintf(stderr,
  90:                 "%s: illegal option -- %c\n", __progname, optopt);
  91:         return (BADCH);
  92:     }
  93:     if (*++oli != ':') {            /* don't need argument */
  94:         optarg = NULL;
  95:         if (!*place)
  96:             ++optind;
  97:     }
  98:     else {                  /* need an argument */
  99:         if (*place)         /* no white space */
 100:             optarg = place;
 101:         else if (nargc <= ++optind) {   /* no arg */
 102:             place = EMSG;
 103:             if (*ostr == ':')
 104:                 return (BADARG);
 105:             if (opterr)
 106:                 (void)fprintf(stderr,
 107:                     "%s: option requires an argument -- %c\n",
 108:                     __progname, optopt);
 109:             return (BADCH);
 110:         }
 111:         else                /* white space */
 112:             optarg = nargv[optind];
 113:         place = EMSG;
 114:         ++optind;
 115:     }
 116:     return (optopt);            /* dump back option letter */
 117: }

Defined functions

Defined variables

Defined macros