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 -----------------------------------------------------------------------------*/
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <string.h>
39 int opterror = 1, /* if error message should be printed */
40 optindex = 1, /* index into parent argv vector */
41 optopt, /* character checked for validity */
42 optreset; /* reset getopt */
43 char *optarg; /* argument associated with option */
45 #define BADCH (int)'?'
46 #define BADARG (int)':'
47 #define EMSG ""
49 /*
50 * getopt --
51 * Parse argc/argv argument vector.
52 */
53 int my_getopt(int nargc, char * const *nargv, const char *ostr)
54 {
55 /* int nargc;
56 char * const *nargv;
57 const char *ostr; */
59 static char *place = EMSG; /* option letter processing */
60 char *oli; /* option letter list index */
62 if (optreset || !*place)
63 { /* update scanning pointer */
64 optreset = 0;
65 if (optindex >= nargc || *(place = nargv[optindex]) != '-')
66 {
67 place = EMSG;
68 return (-1);
69 }
70 if (place[1] && *++place == '-')
71 { /* found "--" */
72 ++optindex;
73 place = EMSG;
74 return (-1);
75 }
76 } /* option letter okay? */
77 if ((optopt = (int)*place++) == (int)':' ||
78 !(oli = strchr(ostr, optopt)))
79 {
80 /*
81 * if the user didn't specify '-' as an option,
82 * assume it means -1.
83 */
84 if (optopt == (int)'-')
85 return (-1);
86 if (!*place)
87 ++optindex;
88 if (opterror && *ostr != ':')
89 (void)fprintf(stderr,
90 "ERROR : unknown option -- %c\n", optopt);
91 return (BADCH);
92 }
93 if (*++oli != ':')
94 { /* don't need argument */
95 optarg = NULL;
96 if (!*place)
97 ++optindex;
98 }
99 else
100 { /* need an argument */
101 if (*place) /* no white space */
102 optarg = place;
103 else if (nargc <= ++optindex)
104 { /* no arg */
105 place = EMSG;
106 if (*ostr == ':')
107 return (BADARG);
108 if (opterror)
109 (void)fprintf(stderr,
110 "ERROR : option requires an argument -- %c\n",
111 optopt);
112 return (BADCH);
113 }
114 else /* white space */
115 optarg = nargv[optindex];
116 place = EMSG;
117 ++optindex;
118 }
119 return (optopt); /* dump back option letter */
120 }