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/*
* libcaca Colour ASCII-Art library
* Copyright (c) 2002-2010 Sam Hocevar <sam@hocevar.net>
* All Rights Reserved
*
* This program is free software. It comes without any warranty, to
* the extent permitted by applicable law. You can redistribute it
* and/or modify it under the terms of the Do What The Fuck You Want
* To Public License, Version 2, as published by Sam Hocevar. See
* http://sam.zoy.org/wtfpl/COPYING for more details.
*/
/*
* getopt.c: getopt_long reimplementation
*/
#include "config.h"
#if !defined __KERNEL__
# include <stdio.h>
# include <string.h>
# if defined HAVE_GETOPT_H && defined HAVE_GETOPT_LONG
# include <getopt.h>
# endif
#endif
#include "caca.h"
#include "caca_internals.h"
int caca_optind = 1;
char *caca_optarg = NULL;
int caca_getopt(int argc, char * const _argv[], char const *optstring,
struct caca_option const *longopts, int *longindex)
{
#if defined HAVE_GETOPT_LONG
int ret;
optind = caca_optind;
optarg = caca_optarg;
ret = getopt_long(argc, _argv, optstring,
(struct option const *)longopts, longindex);
caca_optind = optind;
caca_optarg = optarg;
return ret;
#else
/* XXX: this getopt_long implementation should not be trusted for other
* applications without any serious peer reviewing. It “just works” with
* zzuf and a few libcaca programs but may fail miserably in other
* programs. */
char **argv = (char **)(uintptr_t)_argv;
char *flag;
int i;
if(caca_optind >= argc)
return -1;
flag = argv[caca_optind];
if(flag[0] == '-' && flag[1] != '-')
{
char *tmp;
int ret = flag[1];
if(ret == '\0')
return -1;
tmp = strchr(optstring, ret);
if(!tmp || ret == ':')
return '?';
caca_optind++;
if(tmp[1] == ':')
{
if(flag[2] != '\0')
caca_optarg = flag + 2;
else
caca_optarg = argv[caca_optind++];
return ret;
}
if(flag[2] != '\0')
{
flag[1] = '-';
caca_optind--;
argv[caca_optind]++;
}
return ret;
}
if(flag[0] == '-' && flag[1] == '-')
{
if(flag[2] == '\0')
return -1;
for(i = 0; longopts[i].name; i++)
{
size_t l = strlen(longopts[i].name);
if(strncmp(flag + 2, longopts[i].name, l))
continue;
switch(flag[2 + l])
{
case '=':
if(!longopts[i].has_arg)
goto bad_opt;
if(longindex)
*longindex = i;
caca_optind++;
caca_optarg = flag + 2 + l + 1;
return longopts[i].val;
case '\0':
if(longindex)
*longindex = i;
caca_optind++;
if(longopts[i].has_arg)
caca_optarg = argv[caca_optind++];
return longopts[i].val;
default:
break;
}
}
bad_opt:
fprintf(stderr, "%s: unrecognized option `%s'\n", argv[0], flag);
return '?';
}
return -1;
#endif
}
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