From 4f9a0ef1894c98ebe44742fcb32e353e165a900e Mon Sep 17 00:00:00 2001
From: Mineplay <tristanfranssen@strawhats.nl>
Date: Fri, 11 Jul 2025 06:17:15 -0500
Subject: [PATCH] feat(string): implemented insert at index function

---
 Include/Fledasty/Strings/String.h |  1 +
 Src/Strings/String.c              | 26 ++++++++++++++++++++++++++
 Tests/Main.c                      |  3 +++
 3 files changed, 30 insertions(+)

diff --git a/Include/Fledasty/Strings/String.h b/Include/Fledasty/Strings/String.h
index d27e3f9..1cd4416 100644
--- a/Include/Fledasty/Strings/String.h
+++ b/Include/Fledasty/Strings/String.h
@@ -39,5 +39,6 @@ typedef struct {
 FledastyError fledasty_string_free(FledastyString *current_string);
 
 FledastyError fledasty_string_append(FledastyString *current_string, char *character_string, const size_t character_string_size);
+FledastyError fledasty_string_insert_at_index(FledastyString *current_string, const size_t index, char *character_string, const size_t character_string_size);
 
 #endif
diff --git a/Src/Strings/String.c b/Src/Strings/String.c
index 891fe71..2df815f 100644
--- a/Src/Strings/String.c
+++ b/Src/Strings/String.c
@@ -63,3 +63,29 @@ FledastyError fledasty_string_append(FledastyString *current_string, char *chara
 
     return FLEDASTY_ERROR_NONE;
 }
+
+FledastyError fledasty_string_insert_at_index(FledastyString *current_string, const size_t index, char *character_string, const size_t character_string_size) {
+    if (current_string == NULL || character_string == NULL || character_string_size == 0) {
+        return FLEDASTY_ERROR_INVALID_POINTER;
+    }
+
+    if (index > current_string->size) {
+        return FLEDASTY_ERROR_INDEX_OUT_OF_RANGE;
+    }
+
+    if (current_string->capacity <= current_string->size + character_string_size) {
+        current_string->capacity += (current_string->capacity > character_string_size) ? current_string->capacity : character_string_size;
+        current_string->character_string = (char*)hallocy_realloc(current_string->character_string, current_string->capacity * sizeof(unsigned char));
+
+        if (current_string->character_string == NULL) {
+            return FLEDASTY_ERROR_FAILED_ALLOCATION;
+        }
+    }
+
+    hallocy_move_memory(current_string->character_string + (index + character_string_size), current_string->character_string + index, current_string->size - index);
+    hallocy_copy_memory(current_string->character_string + index, character_string, character_string_size);
+    
+    current_string->size += character_string_size;
+    current_string->character_string[current_string->size] = '\0';
+    return FLEDASTY_ERROR_NONE;
+}
diff --git a/Tests/Main.c b/Tests/Main.c
index 13e1e6b..a4a3495 100644
--- a/Tests/Main.c
+++ b/Tests/Main.c
@@ -284,8 +284,11 @@ int main() {
     fledasty_utf8_string_free(&test_utf8_string);
 
     FledastyString normal_test_string = { 0, 0, NULL };
+
     fledasty_string_append(&normal_test_string, "Testing", 7);
     printf("%s\n", normal_test_string.character_string);
+    fledasty_string_insert_at_index(&normal_test_string, normal_test_string.size, (char*)"index", 5);
+    printf("%s\n", normal_test_string.character_string);
 
     fledasty_string_free(&normal_test_string);
     printf("Done\n");