1 files changed, 63 insertions, 0 deletions
diff --git a/typeutils.h b/typeutils.h
new file mode 100644
index 0000000..1d260ef
--- /dev/null
+++ b/typeutils.h
@@ -0,0 +1,63 @@
+#pragma once
+
+#include <ctype.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdbool.h>
+#include <stdio.h>
+
+
+#define DECLARE_VEC(T, Name)                                        \
+    typedef struct {                                                \
+        T* items;                                                   \
+        size_t count;                                               \
+        size_t cap;                                                 \
+        size_t incr_step;                                           \
+    } Name;                                                         \
+    static inline Name make_##Name(size_t step) {                   \
+        return (Name) {                                             \
+            .items = malloc(step* sizeof(T)),                       \
+            .count = 0,                                             \
+            .cap = step,                                            \
+            .incr_step = step,                                      \
+        };                                                          \
+    }                                                               \
+    static inline void push_to_##Name(Name* vec, T item) {          \
+        if (vec->count == vec->cap) {                               \
+            vec->cap += vec->incr_step;                             \
+            vec->items = realloc(                                   \
+                vec->items,                                         \
+                vec->cap * sizeof(T)                                \
+            );                                                      \
+        }                                                           \
+        vec->items[vec->count++] = item;                            \
+    }                                                               
+
+
+DECLARE_VEC(char, String);
+
+void append_str_to_String(String* target, char* src_str) {
+    size_t required_size = 
+        ((target->count + strlen(src_str)) / target->incr_step + 1) * target->incr_step; 
+    if (required_size > target->cap) {
+        target->cap = required_size;
+        target->items = realloc(target->items, required_size * sizeof(char));
+    }
+    memcpy(target->items + target->count, src_str, strlen(src_str));
+    target->count += strlen(src_str);
+}
+
+static inline char* inner(String str) {
+    if (str.count == str.cap) {
+        str.items = realloc(str.items, (str.cap+1)*sizeof(char));
+    }
+    str.items[str.count] = '\0';
+    return str.items;
+}
+
+#define DECLARE_MAYBE(T)                                            \
+    typedef struct {                                                \
+        bool some;                                                  \
+        T value;                                                    \
+    } Maybe##T;