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getopt.c
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1 /* src/port/getopt.c */
2 
3 /*
4  * Copyright (c) 1987, 1993, 1994
5  * The Regents of the University of California. All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  * notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  * notice, this list of conditions and the following disclaimer in the
14  * documentation and/or other materials provided with the distribution.
15  * 3. Neither the name of the University nor the names of its contributors
16  * may be used to endorse or promote products derived from this software
17  * without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  */
30 
31 #include "c.h"
32 
33 #include "pg_getopt.h"
34 
35 #if defined(LIBC_SCCS) && !defined(lint)
36 static char sccsid[] = "@(#)getopt.c 8.3 (Berkeley) 4/27/95";
37 #endif /* LIBC_SCCS and not lint */
38 
39 
40 /*
41  * On OpenBSD and some versions of Solaris, opterr and friends are defined in
42  * core libc rather than in a separate getopt module. Define these variables
43  * only if configure found they aren't there by default; otherwise, this
44  * module and its callers will just use libc's variables. (We assume that
45  * testing opterr is sufficient for all of these.)
46  */
47 #ifndef HAVE_INT_OPTERR
48 
49 int opterr = 1, /* if error message should be printed */
50  optind = 1, /* index into parent argv vector */
51  optopt; /* character checked for validity */
52 char *optarg; /* argument associated with option */
53 
54 #endif
55 
56 #define BADCH (int)'?'
57 #define BADARG (int)':'
58 #define EMSG ""
59 
60 /*
61  * getopt
62  * Parse argc/argv argument vector.
63  *
64  * This implementation does not use optreset. Instead, we guarantee that
65  * it can be restarted on a new argv array after a previous call returned -1,
66  * if the caller resets optind to 1 before the first call of the new series.
67  * (Internally, this means we must be sure to reset "place" to EMSG before
68  * returning -1.)
69  */
70 int
71 getopt(int nargc, char *const *nargv, const char *ostr)
72 {
73  static char *place = EMSG; /* option letter processing */
74  char *oli; /* option letter list index */
75 
76  if (!*place)
77  { /* update scanning pointer */
78  if (optind >= nargc || *(place = nargv[optind]) != '-')
79  {
80  place = EMSG;
81  return -1;
82  }
83  if (place[1] && *++place == '-' && place[1] == '\0')
84  { /* found "--" */
85  ++optind;
86  place = EMSG;
87  return -1;
88  }
89  } /* option letter okay? */
90  if ((optopt = (int) *place++) == (int) ':' ||
91  !(oli = strchr(ostr, optopt)))
92  {
93  /*
94  * if the user didn't specify '-' as an option, assume it means -1.
95  */
96  if (optopt == (int) '-')
97  {
98  place = EMSG;
99  return -1;
100  }
101  if (!*place)
102  ++optind;
103  if (opterr && *ostr != ':')
104  (void) fprintf(stderr,
105  "illegal option -- %c\n", optopt);
106  return BADCH;
107  }
108  if (*++oli != ':')
109  { /* don't need argument */
110  optarg = NULL;
111  if (!*place)
112  ++optind;
113  }
114  else
115  { /* need an argument */
116  if (*place) /* no white space */
117  optarg = place;
118  else if (nargc <= ++optind)
119  { /* no arg */
120  place = EMSG;
121  if (*ostr == ':')
122  return BADARG;
123  if (opterr)
124  (void) fprintf(stderr,
125  "option requires an argument -- %c\n",
126  optopt);
127  return BADCH;
128  }
129  else
130  /* white space */
131  optarg = nargv[optind];
132  place = EMSG;
133  ++optind;
134  }
135  return optopt; /* dump back option letter */
136 }
int optopt
Definition: getopt.c:50
int optind
Definition: getopt.c:50
int getopt(int nargc, char *const *nargv, const char *ostr)
Definition: getopt.c:71
int opterr
Definition: getopt.c:49
#define BADARG
Definition: getopt.c:57
#define fprintf
Definition: port.h:196
#define EMSG
Definition: getopt.c:58
#define BADCH
Definition: getopt.c:56
char * optarg
Definition: getopt.c:52