stdlib/getopt.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1987, 1993, 1994
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgement:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  */
  57
  58
  59 #include <stdio.h>
  60 #include <stdlib.h>
  61 #include <string.h>
  62
  63 #include <crt_externs.h>
  64
  65 int     opterr = 1,             /* if error message should be printed */
  66         optind = 1,             /* index into parent argv vector */
  67         optopt,                 /* character checked for validity */
  68         optreset;               /* reset getopt */
  69 char    *optarg;                /* argument associated with option */
  70
  71 #define BADCH   (int)'?'
  72 #define BADARG  (int)':'
  73 #define EMSG    ""
  74
  75 /*
  76  * getopt --
  77  *      Parse argc/argv argument vector.
  78  */
  79 int
  80 getopt(nargc, nargv, ostr)
  81         int nargc;
  82         char * const *nargv;
  83         const char *ostr;
  84 {
  85         char *__progname = *(*_NSGetArgv());
  86         static char *place = EMSG;              /* option letter processing */
  87         char *oli;                              /* option letter list index */
  88
  89         if (optreset || !*place) {              /* update scanning pointer */
  90                 optreset = 0;
  91                 if (optind >= nargc || *(place = nargv[optind]) != '-') {
  92                         place = EMSG;
  93                         return (EOF);
  94                 }
  95                 if (place[1] && *++place == '-') {      /* found "--" */
  96                         ++optind;
  97                         place = EMSG;
  98                         return (EOF);
  99                 }
 100         }                                       /* option letter okay? */
 101         if ((optopt = (int)*place++) == (int)':' ||
 102             !(oli = strchr(ostr, optopt))) {
 103                 /*
 104                  * if the user didn't specify '-' as an option,
 105                  * assume it means EOF.
 106                  */
 107                 if (optopt == (int)'-')
 108                         return (EOF);
 109                 if (!*place)
 110                         ++optind;
 111                 if (opterr && *ostr != ':')
 112                         (void)fprintf(stderr,
 113                             "%s: illegal option -- %c\n", __progname, optopt);
 114                 return (BADCH);
 115         }
 116         if (*++oli != ':') {                    /* don't need argument */
 117                 optarg = NULL;
 118                 if (!*place)
 119                         ++optind;
 120         }
 121         else {                                  /* need an argument */
 122                 if (*place)                     /* no white space */
 123                         optarg = place;
 124                 else if (nargc <= ++optind) {   /* no arg */
 125                         place = EMSG;
 126                         if (*ostr == ':')
 127                                 return (BADARG);
 128                         if (opterr)
 129                                 (void)fprintf(stderr,
 130                                     "%s: option requires an argument -- %c\n",
 131                                     __progname, optopt);
 132                         return (BADCH);
 133                 }
 134                 else                            /* white space */
 135                         optarg = nargv[optind];
 136                 place = EMSG;
 137                 ++optind;
 138         }
 139         return (optopt);                        /* dump back option letter */
 140 }