1 files changed, 34 insertions, 0 deletions
diff --git a/src/args.c b/src/args.c
new file mode 100644
index 0000000..6a516da
--- /dev/null
+++ b/src/args.c
@@ -0,0 +1,34 @@
+#include "args.h"
+int args_optind = 1;
+
+int
+args_getopt(int argc, char *argv[], const char *optstring, char **args_optarg)
+{
+    char option;
+    if (args_optind >= argc) return -1;
+
+    if (argv[args_optind][0] != '-'
+        || strlen(argv[args_optind]) > 2
+        || !strcmp(argv[args_optind], "-")) {
+
+        *args_optarg = argv[args_optind];
+        args_optind++;
+        return 0;
+    }
+
+    int i;
+    option = argv[args_optind][1];
+    for (i = 0; i < strlen(optstring); i++) {
+        if (optstring[i + 1] == ':' && optstring[i] == option) {
+            *args_optarg = argv[++args_optind];
+            args_optind++;
+            return option;
+        } else if (optstring[i + 1] != ':' && optstring[i] == option) {
+            args_optind++;
+            return option;
+        }
+    }
+    args_optarg = 0;
+    args_optind++;
+    return -2;
+}