libpcap  1.10.1
About: libpcap is a packet filter library used by tools like tcpdump.
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getopt.c
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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
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8  * 1. Redistributions of source code must retain the above copyright
9  * notice, this list of conditions and the following disclaimer.
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11  * notice, this list of conditions and the following disclaimer in the
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14  * must display the following acknowledgement:
15  * This product includes software developed by the University of
16  * California, Berkeley and its contributors.
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19  * without specific prior written permission.
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21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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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 
42 #include "getopt.h"
43 
44 int opterr = 1, /* if error message should be printed */
45  optind = 1, /* index into parent argv vector */
46  optopt, /* character checked for validity */
47  optreset; /* reset getopt */
48 char *optarg; /* argument associated with option */
49 
50 #define BADCH (int)'?'
51 #define BADARG (int)':'
52 #define EMSG ""
53 
54 /*
55  * getopt --
56  * Parse argc/argv argument vector.
57  */
58 int
59 getopt(int nargc, char * const *nargv, const char *ostr)
60 {
61  char *cp;
62  static char *__progname;
63  static char *place = EMSG; /* option letter processing */
64  char *oli; /* option letter list index */
65 
66  if (__progname == NULL) {
67  if ((cp = strrchr(nargv[0], '/')) != NULL)
68  __progname = cp + 1;
69  else
70  __progname = nargv[0];
71  }
72  if (optreset || !*place) { /* update scanning pointer */
73  optreset = 0;
74  if (optind >= nargc || *(place = nargv[optind]) != '-') {
75  place = EMSG;
76  return (-1);
77  }
78  if (place[1] && *++place == '-') { /* found "--" */
79  ++optind;
80  place = EMSG;
81  return (-1);
82  }
83  }
84  optopt = (int)*place++;
85  if (optopt == (int)':') { /* option letter okay? */
86  if (!*place)
87  ++optind;
88  if (opterr && *ostr != ':')
89  (void)fprintf(stderr,
90  "%s: illegal option -- %c\n", __progname, optopt);
91  return (BADCH);
92  }
93  oli = strchr(ostr, optopt);
94  if (!oli) {
95  /*
96  * if the user didn't specify '-' as an option,
97  * assume it means -1.
98  */
99  if (optopt == (int)'-')
100  return (-1);
101  if (!*place)
102  ++optind;
103  if (opterr && *ostr != ':')
104  (void)fprintf(stderr,
105  "%s: illegal option -- %c\n", __progname, optopt);
106  return (BADCH);
107  }
108  if (*++oli != ':') { /* don't need argument */
109  optarg = NULL;
110  if (!*place)
111  ++optind;
112  }
113  else { /* need an argument */
114  if (*place) /* no white space */
115  optarg = place;
116  else if (nargc <= ++optind) { /* no arg */
117  place = EMSG;
118  if (*ostr == ':')
119  return (BADARG);
120  if (opterr)
121  (void)fprintf(stderr,
122  "%s: option requires an argument -- %c\n",
123  __progname, optopt);
124  return (BADCH);
125  }
126  else /* white space */
127  optarg = nargv[optind];
128  place = EMSG;
129  ++optind;
130  }
131  return (optopt); /* dump back option letter */
132 }
#define BADCH
Definition: getopt.c:50
int optopt
Definition: getopt.c:46
int optreset
Definition: getopt.c:47
#define BADARG
Definition: getopt.c:51
#define EMSG
Definition: getopt.c:52
int getopt(int nargc, char *const *nargv, const char *ostr)
Definition: getopt.c:59
int optind
Definition: getopt.c:45
char * optarg
Definition: getopt.c:48
int opterr
Definition: getopt.c:44