arg handle

password_gen.c

@@ -21,6 +21,72 @@ void invalid_args(int argc) {
   }
 }
 
+char* character_list(int argc, char** argv) {
+  const char uppercase[] = "QWERTZUIOPASDFGHJKLYXCVBNM";
+  const char lowercase[] = "qwertzuiopasdfghjklyxcvbnm";
+  const char symbols[] = "/!?._-#&";
+  const char numbers[] = "0123456789";
+
+  char* output;
+
+  if (argc == 4) {
+    int final_size = 0;
+
+    for (int i = 0; argv[3][i] != '\0'; i++) {
+      switch (argv[3][i]) {
+        case 'U':
+          final_size += sizeof(uppercase) - 1;
+          break;
+        case 'L':
+          final_size += sizeof(lowercase) - 1;
+          break;
+        case 's':
+          final_size += sizeof(symbols) - 1;
+          break;
+        case 'n':
+          final_size += sizeof(numbers) - 1;
+          break;
+      }
+    }
+    output = malloc(sizeof(char) * (final_size + 1));
+
+    int copy_index = 0;
+
+    for (int i = 0; argv[3][i] != '\0'; i++) {
+      const char* current_list;
+      int size;
+
+      switch (argv[3][i]) {
+        case 'U':
+          current_list = uppercase;
+          size = sizeof(uppercase);
+          break;
+        case 'L':
+          current_list = lowercase;
+          size = sizeof(lowercase);
+          break;
+        case 's':
+          current_list = symbols;
+          size = sizeof(symbols);
+          break;
+        case 'n':
+          current_list = numbers;
+          size = sizeof(numbers);
+          break;
+      }
+
+      for (int j = 0; j < size - 1; j++) {
+        output[copy_index] = current_list[j];
+        copy_index++;
+      }
+
+      output[final_size] = '\0';
+    }
+  }
+
+  return output;
+}
+
 int random_len(int min_length, int max_length) {
   return rand() % (max_length - min_length + 1) + min_length;
 }
@@ -47,12 +113,8 @@ int main(int argc, char** argv) {
 
   int length = random_len(min_length, max_length);
 
-  if (argc != 4) {
-    char* password = random_str(length, argv[4]);
-    puts(password);
-    free(password);
-  } else {
-    char* password = random_str(length, argv[3]);
+  if (argc == 4) {
+    char* password = random_str(length, character_list(argc, argv));
     puts(password);
     free(password);
   }