1 files changed, 71 insertions, 0 deletions
diff --git a/src/cli.c b/src/cli.c
new file mode 100644
index 0000000..9394424
--- /dev/null
+++ b/src/cli.c
@@ -0,0 +1,71 @@
+/* This file is part of Nekopack.
+
+   Copyright (C) 2017 Jakob Tsar-Fox, All Rights Reserved.
+
+   Nekopack is free software: you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by the
+   Free Software Foundation, either version 3 of the License, or (at
+   your option) any later version.
+
+   Nekopack is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with Nekopack. If not, see <http://www.gnu.org/licenses/>. */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <getopt.h>
+
+#include "cli.h"
+
+#define VERSION "0.1.0"
+#define HELP_TEXT "A tool for decompressing the XP3 archives used by " \
+                  "Nekopara.\n\n" \
+                  "   -h, --help\t\tDisplay this help page and " \
+                  "exit.\n" \
+                  "   -v, --version\tDisplay the currently installed " \
+                  "version and exit.\n\n"
+
+
+/* General subroutine for parsing command-line arguments. Returns a
+   "configuration" structure containing everything parsed from argv. */
+struct configuration parse_args(int argc, char *argv[]) {
+    if (argc != 2) {
+        fprintf(stderr, "Usage: %s [OPTIONS] (ARCHIVE PATH)\n", argv[0]);
+        exit(1);
+    }
+
+    /* The struct has to be zeroed out, otherwise argument parsing
+       becomes irrelevant and the program will not act as expected. */
+    struct configuration parsed;
+    memset(&parsed, 0, sizeof(parsed));
+
+    int current = 0, option_index = 0;
+    static struct option long_options[] = {
+        {"help", no_argument, NULL, 'h'},
+        {"version", no_argument, NULL, 'v'},
+        {NULL, 0, NULL, 0}
+    };
+
+    while (current >= 0) {
+        current = getopt_long(argc, argv, "hv", long_options, &option_index);
+
+        switch (current) {
+            case 'h':
+                printf("Usage: %s [OPTIONS] (ARCHIVE PATH)\n\n", argv[0]);
+                printf("%s\n", HELP_TEXT);
+                exit(0);
+            case 'v':
+                printf("Nekopack, version %s\nProgrammed by "
+                       "Jakob. <http://tsar-fox.com/>\n", VERSION);
+                exit(0);
+        }
+    }
+
+    return parsed;
+}