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#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "til_args.h"
/*
* ./rototiller --video=drm,dev=/dev/dri/card3,connector=VGA-1,mode=640x480@60
* ./rototiller --video=sdl,size=640x480
* ./rototiller --module=roto,foo=bar,module=settings
* ./rototiller --defaults // use default settings where unspecified
* ./rototiller --go // don't show args and wait for user input before proceeding
* ./rototiller --seed=0xdeadbeef // explicitly set global random seed instead of generating one
* ./rototiller --print-pipes // print values for the pipes every frame
*
* unrecognized arguments trigger an -EINVAL error, unless res_{argc,argv} are non-NULL
* where a new argv will be allocated and populated with the otherwise invalid arguments
* in the same order they were encountered in the input argv. This is to support integration
* with argv-handling application libraries like glib(g_application_run()).
*/
static int args_parse(int argc, const char *argv[], til_args_t *res_args, int *res_argc, const char **res_argv[])
{
assert(argv);
assert(res_args);
assert(!res_argc || res_argv);
if (res_argv) {
*res_argv = calloc(argc + 1, sizeof(*res_argv));
if (!*res_argv)
return -ENOMEM;
*res_argc = 0;
}
if (!argc)
return 0;
if (res_argv)
(*res_argv)[(*res_argc)++] = argv[0];
/* this is intentionally being kept very simple, no new dependencies like getopt. */
for (int i = 1; i < argc; i++) {
if (!strncasecmp("--video=", argv[i], 8)) {
res_args->video = &argv[i][8];
} else if (!strncasecmp("--module=", argv[i], 9)) {
res_args->module = &argv[i][9];
} else if (!strncasecmp("--seed=", argv[i], 7)) {
res_args->seed = &argv[i][7];
} else if (!strcasecmp("--defaults", argv[i])) {
res_args->use_defaults = 1;
} else if (!strcasecmp("--help", argv[i])) {
res_args->help = 1;
} else if (!strcasecmp("--go", argv[i])) {
res_args->gogogo = 1;
} else if (!strcasecmp("--print-pipes", argv[i])) {
res_args->print_pipes = 1;
} else {
if (!res_argv)
return -EINVAL;
(*res_argv)[(*res_argc)++] = argv[i];
}
}
return 0;
}
int til_args_pruned_parse(int argc, const char *argv[], til_args_t *res_args, int *res_argc, const char **res_argv[])
{
assert(res_argc && res_argv);
return args_parse(argc, argv, res_args, res_argc, res_argv);
}
int til_args_parse(int argc, const char *argv[], til_args_t *res_args)
{
return args_parse(argc, argv, res_args, NULL, NULL);
}
int til_args_help(FILE *out)
{
return fprintf(out,
" --defaults use defaults for unspecified settings\n"
" --go start rendering immediately upon fulfilling all required settings\n"
" --help this help\n"
" --module= module settings\n"
" --seed= seed to use for all PRNG in hexadecimal (e.g. 0xdeadbeef)\n"
" --video= video settings\n"
);
}
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