source: libcaca/trunk/src/mygetopt.c @ 4330

Last change on this file since 4330 was 4148, checked in by Sam Hocevar, 10 years ago

Update my e-mail address everywhere.

File size: 2.8 KB
Line 
1/*
2 *  zzuf - general purpose fuzzer
3 *  Copyright (c) 2002, 2007 Sam Hocevar <sam@hocevar.net>
4 *                All Rights Reserved
5 *
6 *  $Id: mygetopt.c 271 2007-02-02 11:58:06Z sam $
7 *
8 *  This program is free software. It comes without any warranty, to
9 *  the extent permitted by applicable law. You can redistribute it
10 *  and/or modify it under the terms of the Do What The Fuck You Want
11 *  To Public License, Version 2, as published by Sam Hocevar. See
12 *  http://sam.zoy.org/wtfpl/COPYING for more details.
13 */
14
15/*
16 *  mygetopt.c: getopt_long reimplementation
17 */
18
19#include "config.h"
20
21#include <stdio.h>
22#include <string.h>
23
24#include "caca_types.h"
25
26#include "mygetopt.h"
27
28int   myoptind = 1;
29char *myoptarg = NULL;
30
31/* XXX: this getopt_long implementation should not be trusted for other
32 * applications without any serious peer reviewing. It “just works” with
33 * zzuf but may fail miserably in other programs. */
34int mygetopt(int argc, char * const _argv[], const char *optstring,
35             const struct myoption *longopts, int *longindex)
36{
37    char **argv = (char **)(uintptr_t)_argv;
38    char *flag;
39    int i;
40
41    if(myoptind >= argc)
42        return -1;
43
44    flag = argv[myoptind];
45
46    if(flag[0] == '-' && flag[1] != '-')
47    {
48        char *tmp;
49        int ret = flag[1];
50
51        if(ret == '\0')
52            return -1;
53
54        tmp = strchr(optstring, ret);
55        if(!tmp || ret == ':')
56            return '?';
57
58        myoptind++;
59        if(tmp[1] == ':')
60        {
61            if(flag[2] != '\0')
62                myoptarg = flag + 2;
63            else
64                myoptarg = argv[myoptind++];
65            return ret;
66        }
67
68        if(flag[2] != '\0')
69        {
70            flag[1] = '-';
71            myoptind--;
72            argv[myoptind]++;
73        }
74
75        return ret;
76    }
77
78    if(flag[0] == '-' && flag[1] == '-')
79    {
80        if(flag[2] == '\0')
81            return -1;
82
83        for(i = 0; longopts[i].name; i++)
84        {
85            size_t l = strlen(longopts[i].name);
86
87            if(strncmp(flag + 2, longopts[i].name, l))
88                continue;
89
90            switch(flag[2 + l])
91            {
92            case '=':
93                if(!longopts[i].has_arg)
94                    goto bad_opt;
95                if(longindex)
96                    *longindex = i;
97                myoptind++;
98                myoptarg = flag + 2 + l + 1;
99                return longopts[i].val;
100            case '\0':
101                if(longindex)
102                    *longindex = i;
103                myoptind++;
104                if(longopts[i].has_arg)
105                    myoptarg = argv[myoptind++];
106                return longopts[i].val;
107            default:
108                break;
109            }
110        }
111    bad_opt:
112        fprintf(stderr, "%s: unrecognized option `%s'\n", argv[0], flag);
113        return '?';
114    }
115
116    return -1;
117}
118
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