1 files changed, 55 insertions, 2 deletions

diff --git a/cph.c b/cph.c
index f9c00c6..b3e3407 100644
--- a/cph.c
+++ b/cph.c
@@ -21,13 +21,66 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <time.h>
+#include <getopt.h>
 
 static const char *answer_yes = "y";
 static const char *answer_no = "n";
 
-int main(void)
+static unsigned int seed_g;
+
+static struct option options_g[] = {
+    {
+        .name = "yes",
+        .has_arg = required_argument,
+        .flag = NULL,
+        .val = 'y',
+    }, {
+        .name = "no",
+        .has_arg = required_argument,
+        .flag = NULL,
+        .val = 'n',
+    }, {
+        .name = 0,
+        .has_arg = 0,
+        .flag = NULL,
+        .val = 0,
+    }
+};
+
+static int parse_arguments(int *argcp, char *argv[])
+{
+    int opt;
+    int ret = 0;
+
+    while ((opt = getopt_long(*argcp, argv, "y:n:s:", options_g, NULL)) >= 0)
+    {
+        switch (opt) {
+            case 'y':
+                answer_yes = optarg;
+                break;
+            case 'n':
+                answer_no = optarg;
+                break;
+            case '?':
+                ret = -1;
+                break;
+            default:
+                break;
+        }
+    }
+
+    return ret;
+}
+
+int main(int argc, char *argv[])
 {
-    srand(time(NULL));
+    seed_g = time(NULL);
+    if (parse_arguments(&argc, argv) < 0) {
+        fprintf(stderr, "usage: %s [OPTIONS]\n", argv[0]);
+        return -1;
+    }
+
+    srand(seed_g);
 
     for (;;) {
         switch (rand() % 2) {