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15637ed4 RG |
1 | /* |
2 | * Copyright (c) 1987 Regents of the University of California. | |
3 | * 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) | |
dee6c867 C |
35 | /*static char *sccsid = "from: @(#)getopt.c 4.13 (Berkeley) 2/23/91";*/ |
36 | static char *rcsid = "$Id: getopt.c,v 1.5 1993/10/12 21:52:45 jtc Exp $"; | |
15637ed4 RG |
37 | #endif /* LIBC_SCCS and not lint */ |
38 | ||
39 | #include <stdio.h> | |
40 | #include <stdlib.h> | |
41 | #include <string.h> | |
42 | ||
43 | /* | |
44 | * get option letter from argument vector | |
45 | */ | |
dee6c867 C |
46 | int opterr = 1; /* if error message should be printed */ |
47 | int optind = 1; /* index into parent argv vector */ | |
48 | int optopt; /* character checked for validity */ | |
15637ed4 RG |
49 | char *optarg; /* argument associated with option */ |
50 | ||
dee6c867 | 51 | #define NOOPT (int)':' /* No option */ |
15637ed4 RG |
52 | #define BADCH (int)'?' |
53 | #define EMSG "" | |
54 | ||
55 | int | |
56 | getopt(nargc, nargv, ostr) | |
57 | int nargc; | |
58 | char * const *nargv; | |
59 | const char *ostr; | |
60 | { | |
61 | static char *place = EMSG; /* option letter processing */ | |
62 | register char *oli; /* option letter list index */ | |
63 | char *p; | |
64 | ||
65 | if (!*place) { /* update scanning pointer */ | |
66 | if (optind >= nargc || *(place = nargv[optind]) != '-') { | |
67 | place = EMSG; | |
dee6c867 | 68 | return(-1); |
15637ed4 RG |
69 | } |
70 | if (place[1] && *++place == '-') { /* found "--" */ | |
71 | ++optind; | |
72 | place = EMSG; | |
dee6c867 | 73 | return(-1); |
15637ed4 | 74 | } |
dee6c867 C |
75 | } |
76 | /* option letter okay? */ | |
15637ed4 | 77 | if ((optopt = (int)*place++) == (int)':' || |
dee6c867 | 78 | !(oli = strchr(ostr, optopt))) { |
15637ed4 RG |
79 | /* |
80 | * if the user didn't specify '-' as an option, | |
dee6c867 | 81 | * assume it means -1. |
15637ed4 RG |
82 | */ |
83 | if (optopt == (int)'-') | |
dee6c867 | 84 | return(-1); |
15637ed4 RG |
85 | if (!*place) |
86 | ++optind; | |
dee6c867 C |
87 | if (opterr && *ostr != ':') { |
88 | if (!(p = strrchr(*nargv, '/'))) | |
15637ed4 RG |
89 | p = *nargv; |
90 | else | |
91 | ++p; | |
92 | (void)fprintf(stderr, "%s: illegal option -- %c\n", | |
93 | p, optopt); | |
94 | } | |
95 | return(BADCH); | |
96 | } | |
dee6c867 | 97 | |
15637ed4 RG |
98 | if (*++oli != ':') { /* don't need argument */ |
99 | optarg = NULL; | |
100 | if (!*place) | |
101 | ++optind; | |
dee6c867 | 102 | } else { /* need an argument */ |
15637ed4 RG |
103 | if (*place) /* no white space */ |
104 | optarg = place; | |
105 | else if (nargc <= ++optind) { /* no arg */ | |
106 | place = EMSG; | |
dee6c867 C |
107 | if (opterr && *ostr != ':') { |
108 | if (!(p = strrchr(*nargv, '/'))) | |
109 | p = *nargv; | |
110 | else | |
111 | ++p; | |
15637ed4 RG |
112 | (void)fprintf(stderr, |
113 | "%s: option requires an argument -- %c\n", | |
114 | p, optopt); | |
dee6c867 C |
115 | } |
116 | return((*ostr == ':') ? NOOPT : BADCH); | |
15637ed4 RG |
117 | } |
118 | else /* white space */ | |
119 | optarg = nargv[optind]; | |
120 | place = EMSG; | |
121 | ++optind; | |
122 | } | |
123 | return(optopt); /* dump back option letter */ | |
124 | } |