getopt.c
Go to the documentation of this file.
1/*
2 * Copyright (C) 1996-2022 The Squid Software Foundation and contributors
3 *
4 * Squid software is distributed under GPLv2+ license and includes
5 * contributions from numerous individuals and organizations.
6 * Please see the COPYING and CONTRIBUTORS files for details.
7 */
8
9/*
10 * Copyright (c) 1987, 1993, 1994
11 * The Regents of the University of California. All rights reserved.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 */
37
38#include "squid.h"
39
40#if defined(LIBC_SCCS) && !defined(lint)
41static char sccsid[] = "@(#)getopt.c 8.3 (Berkeley) 4/27/95";
42#endif /* LIBC_SCCS and not lint */
43
44#include <stdlib.h>
45#include <string.h>
46
47int opterr = 1, /* if error message should be printed */
48 optind = 1, /* index into parent argv vector */
49 optopt, /* character checked for validity */
50 optreset; /* reset getopt */
51char *optarg; /* argument associated with option */
52
53#define BADCH (int)'?'
54#define BADARG (int)':'
55#define EMSG (char*)""
56
57/*
58 * getopt --
59 * Parse argc/argv argument vector.
60 */
61int
62getopt(nargc, nargv, ostr)
63int nargc;
64char *const *nargv;
65const char *ostr;
66{
67 static char *place = EMSG; /* option letter processing */
68 char *oli; /* option letter list index */
69
70 if (optreset || !*place) { /* update scanning pointer */
71 optreset = 0;
72 if (optind >= nargc || *(place = nargv[optind]) != '-') {
73 place = EMSG;
74 return (-1);
75 }
76 if (place[1] && *++place == '-') { /* found "--" */
77 ++optind;
78 place = EMSG;
79 return (-1);
80 }
81 } /* option letter okay? */
82 if ((optopt = (int) *place++) == (int) ':' ||
83 !(oli = strchr(ostr, optopt))) {
84 /*
85 * if the user didn't specify '-' as an option,
86 * assume it means -1.
87 */
88 if (optopt == (int) '-')
89 return (-1);
90 if (!*place)
91 ++optind;
92 if (opterr && *ostr != ':')
93 (void) fprintf(stderr,
94 "%s: illegal option -- %c\n", __FILE__, optopt);
95 return (BADCH);
96 }
97 if (*++oli != ':') { /* don't need argument */
98 optarg = NULL;
99 if (!*place)
100 ++optind;
101 } else { /* need an argument */
102 if (*place) /* no white space */
103 optarg = place;
104 else if (nargc <= ++optind) { /* no arg */
105 place = EMSG;
106 if (*ostr == ':')
107 return (BADARG);
108 if (opterr)
109 (void) fprintf(stderr,
110 "%s: option requires an argument -- %c\n",
111 __FILE__, optopt);
112 return (BADCH);
113 } else /* white space */
114 optarg = nargv[optind];
115 place = EMSG;
116 ++optind;
117 }
118 return (optopt); /* dump back option letter */
119}
120
#define BADCH
Definition: getopt.c:53
int optopt
Definition: getopt.c:49
int optreset
Definition: getopt.c:50
#define BADARG
Definition: getopt.c:54
#define EMSG
Definition: getopt.c:55
int getopt(int nargc, char *const *nargv, const char *ostr)
Definition: getopt.c:62
int optind
Definition: getopt.c:48
char * optarg
Definition: getopt.c:51
int opterr
Definition: getopt.c:47
#define NULL
Definition: types.h:166

 

Introduction

Documentation

Support

Miscellaneous

Web Site Translations

Mirrors