initial commit

fxkr.c

@@ -0,0 +1,46 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+int
+get_char_int(char in)
+{
+    char buf[2];
+    buf[0] = in;
+    buf[1] = 0;
+    return atoi(buf);
+}
+
+char*
+decode(char *in)
+{
+    static char result[9];
+    int idx = 0;
+
+    if (strlen(in) != 16) {
+        return NULL;
+    }
+
+    for (int i = 0; i < 15; i += 2, ++idx) {
+        int first = get_char_int(in[i]);
+        int second = get_char_int(in[i+1]);
+        result[idx] = first * 16 + second;
+    }
+
+    result[8] = 0;
+
+    return &result[0];
+}
+
+
+int
+main(int argc, char **argv)
+{
+    char *input = "3041314232433344";
+    char *result = decode(input);
+
+    printf("keyword is: %s\n", result);
+
+    return 0;
+}
+

makefile

@@ -0,0 +1,3 @@
+CFLAGS = -Wall
+
+all: fxkr