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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 8.3 (Berkeley) 4/27/95";
36 #endif /* LIBC_SCCS and not lint */
37 
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include "getopt.h"
42 
43 OPENMESHDLLEXPORT int opterr = 1, /* if error message should be printed */
44  optind = 1, /* index into parent argv vector */
45  optopt, /* character checked for validity */
46  optreset; /* reset getopt */
47 OPENMESHDLLEXPORT char *optarg; /* argument associated with option */
48 
49 #define BADCH (int)'?'
50 #define BADARG (int)':'
51 #define EMSG ""
52 
53 /*
54  * getopt --
55  * Parse argc/argv argument vector.
56  */
57 OPENMESHDLLEXPORT int
58 getopt(int nargc, char * const *nargv, const char *ostr)
59 {
60 # define __progname nargv[0]
61  static char *place = EMSG; /* option letter processing */
62  char *oli; /* option letter list index */
63 
64  if (optreset || !*place) { /* update scanning pointer */
65  optreset = 0;
66  if (optind >= nargc || *(place = nargv[optind]) != '-') {
67  place = EMSG;
68  return (-1);
69  }
70  if (place[1] && *++place == '-') { /* found "--" */
71  ++optind;
72  place = EMSG;
73  return (-1);
74  }
75  } /* option letter okay? */
76  if ((optopt = (int)*place++) == (int)':' ||
77  !(oli = (char *)strchr(ostr, optopt))) {
78  /*
79  * if the user didn't specify '-' as an option,
80  * assume it means -1.
81  */
82  if (optopt == (int)'-')
83  return (-1);
84  if (!*place)
85  ++optind;
86  if (opterr && *ostr != ':')
87  (void)fprintf(stderr,
88  "%s: illegal option -- %c\n", __progname, optopt);
89  return (BADCH);
90  }
91  if (*++oli != ':') { /* don't need argument */
92  optarg = NULL;
93  if (!*place)
94  ++optind;
95  }
96  else { /* need an argument */
97  if (*place) /* no white space */
98  optarg = place;
99  else if (nargc <= ++optind) { /* no arg */
100  place = EMSG;
101  if (*ostr == ':')
102  return (BADARG);
103  if (opterr)
104  (void)fprintf(stderr,
105  "%s: option requires an argument -- %c\n",
106  __progname, optopt);
107  return (BADCH);
108  }
109  else /* white space */
110  optarg = nargv[optind];
111  place = EMSG;
112  ++optind;
113  }
114  return (optopt); /* dump back option letter */
115 }
116