stdlib/getopt.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (c) 1987, 1993, 1994
  24  *      The Regents of the University of California.  All rights reserved.
  25  *
  26  * Redistribution and use in source and binary forms, with or without
  27  * modification, are permitted provided that the following conditions
  28  * are met:
  29  * 1. Redistributions of source code must retain the above copyright
  30  *    notice, this list of conditions and the following disclaimer.
  31  * 2. Redistributions in binary form must reproduce the above copyright
  32  *    notice, this list of conditions and the following disclaimer in the
  33  *    documentation and/or other materials provided with the distribution.
  34  * 3. All advertising materials mentioning features or use of this software
  35  *    must display the following acknowledgement:
  36  *      This product includes software developed by the University of
  37  *      California, Berkeley and its contributors.
  38  * 4. Neither the name of the University nor the names of its contributors
  39  *    may be used to endorse or promote products derived from this software
  40  *    without specific prior written permission.
  41  *
  42  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  43  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  44  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  45  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  46  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  47  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  48  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  49  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  50  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  51  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  52  * SUCH DAMAGE.
  53  */
  54
  55
  56 #include <stdio.h>
  57 #include <stdlib.h>
  58 #include <string.h>
  59
  60 #include <crt_externs.h>
  61
  62 int     opterr = 1,             /* if error message should be printed */
  63         optind = 1,             /* index into parent argv vector */
  64         optopt,                 /* character checked for validity */
  65         optreset;               /* reset getopt */
  66 char    *optarg;                /* argument associated with option */
  67
  68 #define BADCH   (int)'?'
  69 #define BADARG  (int)':'
  70 #define EMSG    ""
  71
  72 /*
  73  * getopt --
  74  *      Parse argc/argv argument vector.
  75  */
  76 int
  77 getopt(nargc, nargv, ostr)
  78         int nargc;
  79         char * const *nargv;
  80         const char *ostr;
  81 {
  82         char *__progname = *(*_NSGetArgv());
  83         static char *place = EMSG;              /* option letter processing */
  84         char *oli;                              /* option letter list index */
  85
  86         if (optreset || !*place) {              /* update scanning pointer */
  87                 optreset = 0;
  88                 if (optind >= nargc || *(place = nargv[optind]) != '-') {
  89                         place = EMSG;
  90                         return (EOF);
  91                 }
  92                 if (place[1] && *++place == '-') {      /* found "--" */
  93                         ++optind;
  94                         place = EMSG;
  95                         return (EOF);
  96                 }
  97         }                                       /* option letter okay? */
  98         if ((optopt = (int)*place++) == (int)':' ||
  99             !(oli = strchr(ostr, optopt))) {
 100                 /*
 101                  * if the user didn't specify '-' as an option,
 102                  * assume it means EOF.
 103                  */
 104                 if (optopt == (int)'-')
 105                         return (EOF);
 106                 if (!*place)
 107                         ++optind;
 108                 if (opterr && *ostr != ':')
 109                         (void)fprintf(stderr,
 110                             "%s: illegal option -- %c\n", __progname, optopt);
 111                 return (BADCH);
 112         }
 113         if (*++oli != ':') {                    /* don't need argument */
 114                 optarg = NULL;
 115                 if (!*place)
 116                         ++optind;
 117         }
 118         else {                                  /* need an argument */
 119                 if (*place)                     /* no white space */
 120                         optarg = place;
 121                 else if (nargc <= ++optind) {   /* no arg */
 122                         place = EMSG;
 123                         if (*ostr == ':')
 124                                 return (BADARG);
 125                         if (opterr)
 126                                 (void)fprintf(stderr,
 127                                     "%s: option requires an argument -- %c\n",
 128                                     __progname, optopt);
 129                         return (BADCH);
 130                 }
 131                 else                            /* white space */
 132                         optarg = nargv[optind];
 133                 place = EMSG;
 134                 ++optind;
 135         }
 136         return (optopt);                        /* dump back option letter */
 137 }