use SDL stdlib where possible

src/rendering/twn_gl_15_rendering.c

@@ -176,8 +176,8 @@ void render_circle(const CirclePrimitive *circle) {
     glDisableClientState(GL_COLOR_ARRAY);
     glDisableClientState(GL_VERTEX_ARRAY);
 
-    free(vertices);
-    free(indices);
+    SDL_free(vertices);
+    SDL_free(indices);
 }
 
 
@@ -222,7 +222,7 @@ bool push_to_vertex_buffer_builder(VertexBufferBuilder *builder,
     if (builder->bytes_left == 0)
         return false;
 
-    memcpy(builder->mapping, bytes, size);
+    SDL_memcpy(builder->mapping, bytes, size);
     builder->bytes_left -= size;
 
     /* trigger data send */

src/rendering/twn_rendering.c

@@ -26,7 +26,7 @@ void render_queue_clear(void) {
     /* if you're gonna remove it, this is also being done in main.c */
     for (size_t i = 0; i < arrlenu(ctx.render_queue_2d); ++i) {
         if (ctx.render_queue_2d[i].type == PRIMITIVE_2D_TEXT) {
-            free(ctx.render_queue_2d[i].text.text);
+            SDL_free(ctx.render_queue_2d[i].text.text);
         }
     }
     

src/rendering/twn_text.c

@@ -53,16 +53,16 @@ static FontData *text_load_font_data(const char *path, int height_px) {
         TEXT_FONT_TEXTURE_SIZE,
         TEXT_FONT_TEXTURE_SIZE
     );
-    free(bitmap);
+    SDL_free(bitmap);
 
     return font_data;
 }
 
 
 static void text_destroy_font_data(FontData *font_data) {
-    free(font_data->file_bytes);
+    SDL_free(font_data->file_bytes);
     delete_gpu_texture(font_data->texture);
-    free(font_data);
+    SDL_free(font_data);
 }
 
 
@@ -114,7 +114,7 @@ static void ensure_font_cache(const char *font_path, int height_px) {
     bool is_cached = false;
     for (size_t i = 0; i < arrlenu(ctx.text_cache.data); ++i) {
         FontData *font_data = ctx.text_cache.data[i];
-        if ((strcmp(font_path, font_data->file_path) == 0) && height_px == font_data->height_px) {
+        if ((SDL_strcmp(font_path, font_data->file_path) == 0) && height_px == font_data->height_px) {
             is_cached = true;
             break;
         }
@@ -130,7 +130,7 @@ static FontData *get_font_data(const char *font_path, int height_px) {
     FontData *font_data = NULL;
     for (size_t i = 0; i < arrlenu(ctx.text_cache.data); ++i) {
         font_data = ctx.text_cache.data[i];
-        if ((strcmp(font_path, font_data->file_path) == 0) && height_px == font_data->height_px) {
+        if ((SDL_strcmp(font_path, font_data->file_path) == 0) && height_px == font_data->height_px) {
             break;
         }
     }
@@ -161,11 +161,9 @@ void text_cache_deinit(TextCache *cache) {
 void push_text(char *string, Vec2 position, int height_px, Color color, const char *font_path) {
     ensure_font_cache(font_path, height_px);
 
-    /* the string might not be around by the time it's used, so copy it */
+    /* the original string might not be around by the time it's used, so copy it */
     /* TODO: arena */
-    /* NOTE: can we trust strlen? */
-    char *dup_string = cmalloc(strlen(string) + 1);
-    strcpy(dup_string, string);
+    char *dup_string = SDL_strdup(string);
 
     TextPrimitive text = {
         .color = color,