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-rw-r--r--dimension/main.c62
1 files changed, 45 insertions, 17 deletions
diff --git a/dimension/main.c b/dimension/main.c
index 8a268b9..e5a5c1b 100644
--- a/dimension/main.c
+++ b/dimension/main.c
@@ -34,6 +34,8 @@ static unsigned int width = 640, height = 480;
static unsigned int nthreads = 0;
static int tokenize = 0, parse = 0;
+static void print_usage(FILE *file, const char *arg0);
+
int
main(int argc, char **argv) {
/*
@@ -46,8 +48,8 @@ main(int argc, char **argv) {
};
static struct option long_options[] = {
+ { "help", no_argument, NULL, '?' },
{ "output", required_argument, NULL, 'o' },
- { "input", required_argument, NULL, 'i' },
{ "width", required_argument, NULL, 'w' },
{ "height", required_argument, NULL, 'h' },
{ "threads", required_argument, NULL, DMNSN_OPT_THREADS },
@@ -59,7 +61,7 @@ main(int argc, char **argv) {
int opt, opt_index;
while (1) {
- opt = getopt_long(argc, argv, "o:i:w:h:", long_options, &opt_index);
+ opt = getopt_long(argc, argv, "?o:w:h:", long_options, &opt_index);
if (opt == -1)
break;
@@ -69,24 +71,20 @@ main(int argc, char **argv) {
/* Option set a flag - do nothing here */
break;
+ case '?':
+ print_usage(stdout, argv[0]);
+ return EXIT_SUCCESS;
+
case 'o':
if (output) {
fprintf(stderr, "--output specified more than once!\n");
+ print_usage(stderr, argv[0]);
return EXIT_FAILURE;
} else {
output = optarg;
}
break;
- case 'i':
- if (input) {
- fprintf(stderr, "--input specified more than once!\n");
- return EXIT_FAILURE;
- } else {
- input = optarg;
- }
- break;
-
case 'w':
{
dmnsn_assert(optarg, "NULL argument.");
@@ -95,6 +93,7 @@ main(int argc, char **argv) {
width = strtoul(optarg, &endptr, 10);
if (*endptr != '\0' || endptr == optarg) {
fprintf(stderr, "Invalid argument to --width!\n");
+ print_usage(stderr, argv[0]);
return EXIT_FAILURE;
}
break;
@@ -107,6 +106,7 @@ main(int argc, char **argv) {
height = strtoul(optarg, &endptr, 10);
if (*endptr != '\0' || endptr == optarg) {
fprintf(stderr, "Invalid argument to --height!\n");
+ print_usage(stderr, argv[0]);
return EXIT_FAILURE;
}
break;
@@ -120,6 +120,7 @@ main(int argc, char **argv) {
nthreads = strtoul(optarg, &endptr, 10);
if (*endptr != '\0' || endptr == optarg) {
fprintf(stderr, "Invalid argument to --threads!\n");
+ print_usage(stderr, argv[0]);
return EXIT_FAILURE;
}
break;
@@ -127,24 +128,22 @@ main(int argc, char **argv) {
default:
fprintf(stderr, "Invalid command line option!\n");
+ print_usage(stderr, argv[0]);
return EXIT_FAILURE;
};
}
if (optind == argc - 1) {
- if (input) {
- fprintf(stderr, "Multiple input files specified!\n");
- return EXIT_FAILURE;
- } else {
- input = argv[optind];
- }
+ input = argv[optind];
} else if (optind < argc) {
fprintf(stderr, "Invalid extranious command line options!\n");
+ print_usage(stderr, argv[0]);
return EXIT_FAILURE;
}
if (!input) {
fprintf(stderr, "No input file specified!\n");
+ print_usage(stderr, argv[0]);
return EXIT_FAILURE;
}
@@ -291,3 +290,32 @@ main(int argc, char **argv) {
dmnsn_delete_scene(scene);
return EXIT_SUCCESS;
}
+
+static void
+print_usage(FILE *file, const char *arg0)
+{
+ fprintf(file,
+ "Usage: %s [OPTIONS...] INPUT_FILE\n\n"
+ " Main options:\n"
+ " -?, --help show this help\n"
+ " -o, --output=FILE output to FILE\n\n"
+ " Output options:\n"
+ " -w, --width=WIDTH set canvas width to WIDTH (default 640)\n"
+ " -h, --height=HEIGHT set canvas height to HEIGHT (default 480)\n\n"
+ " Rendering options:\n"
+ " --threads=THREADS render with THREADS parallel threads\n\n"
+ " Debugging options:\n"
+ " --tokenize tokenize the input and print the token list\n"
+ " --parse parse the input and print the abstract syntax"
+ " tree\n\n"
+ " Special options:\n"
+ " -- indicates the end of the argument list\n\n"
+ "%s\n"
+ "%s\n"
+ "Copyright (C) 2009-10 Tavian Barnes, <%s>\n"
+ "Licensed under the GNU General Public License\n",
+ arg0,
+ PACKAGE_STRING,
+ PACKAGE_URL,
+ PACKAGE_BUGREPORT);
+}