fix: print bare program name in usage instead of argv[0] path

tools/fpack.c

@@ -6,6 +6,12 @@
 #include <string.h>
 #include <sys/stat.h>
 
+#ifdef _WIN32
+#define PROGRAM_NAME "fpack.exe"
+#else
+#define PROGRAM_NAME "fpack"
+#endif
+
 #define FPACK_QUIET    (1u << 0)
 #define FPACK_VERBOSE  (1u << 1)
 #define FPACK_PROGRESS (1u << 2)
@@ -200,9 +206,9 @@ static int add_dir(struct fpk_writer *w, const char *dir, size_t base_len)
 	return 1;
 }
 
-static void usage(const char *name)
+static void usage(void)
 {
-	fprintf(stderr, "usage: %s [-o output.fpk] [-p] [-q] [-v] input_dir\n", name);
+	fprintf(stderr, "usage: %s [-o output.fpk] [-p] [-q] [-v] input_dir\n", PROGRAM_NAME);
 	exit(1);
 }
 
@@ -230,12 +236,12 @@ int main(int argc, char **argv)
 			flags |= FPACK_VERBOSE;
 			break;
 		default:
-			usage(argv[0]);
+			usage();
 		}
 	}
 
 	if (optind != argc - 1)
-		usage(argv[0]);
+		usage();
 
 	input_dir = argv[optind];
 	output = output_arg ? dup_str(output_arg) : derive_output_name(input_dir);