misc: Add initial argument parsing

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 43 insertions, 1 deletions

diff --git a/emux64/src/main.c b/emux64/src/main.c
index cacd6b3..4396eb5 100644
--- a/emux64/src/main.c
+++ b/emux64/src/main.c
@@ -29,13 +29,55 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <unistd.h>
 #include <cpu/cpu.h>
+#include <string.h>
+
+static char *rom_file = NULL;
+
+static void
+help(void)
+{
+    printf(
+        "- OSMX64 emulator -\n"
+        "[-h] Show this help menu\n"
+        "[-r] <rom_file>\n"
+    );
+}
+
+static void
+cleanup(void)
+{
+    if (rom_file != NULL) {
+        free(rom_file);
+        rom_file = NULL;
+    }
+}
 
 int
-main(void)
+main(int argc, char **argv)
 {
     struct osmx_core core;
     int error;
+    int c;
+
+    atexit(cleanup);
+    while ((c = getopt(argc, argv, "hr:")) != -1) {
+        switch (c) {
+        case 'h':
+            help();
+            return 0;
+        case 'r':
+            rom_file = strdup(optarg);
+            break;
+        }
+    }
+
+    if (rom_file == NULL) {
+        printf("** please select a ROM file\n");
+        help();
+        return -1;
+    }
 
     if ((error = cpu_reset(&core)) < 0) {
         printf("error: failed to power up vcore\n");