l4darr: 加入 l4da_drop_struct 和 l4da_make_struct，用來捨棄或加入 L4DA 資料結構

2 files changed, 24 insertions, 0 deletions

diff --git a/l4darr/d1array.c b/l4darr/d1array.c
index 99d646f..4e84f1c 100644
--- a/l4darr/d1array.c
+++ b/l4darr/d1array.c
@@ -108,3 +108,24 @@ int l4da_strip(L4DA* arr){
 	}
 	return 0;
 }
+
+/* 基本上直接玩 struct 的函式還是少用吧 */
+void* l4da_drop_struct(L4DA* arr){
+	void* toreturn = arr->arr_data;
+	free(arr);
+	return toreturn;
+}
+
+L4DA* l4da_make_struct(void* data, int itemsize, int len, int maxlen){
+	if(itemsize <= 0 || len < 0 || maxlen < len){
+		return NULL;
+	}
+	L4DA* arr = (L4DA*)malloc(sizeof(L4DA));
+	if(arr == NULL){
+		return NULL;
+	}
+	arr->arr_itemsize = itemsize;
+	arr->arr_curlen = len;
+	arr->arr_maxlen = maxlen;
+	return arr;
+}
diff --git a/l4darr/l4darr.h b/l4darr/l4darr.h
index 30c9285..5f0c4ad 100644
--- a/l4darr/l4darr.h
+++ b/l4darr/l4darr.h
@@ -36,6 +36,9 @@ L4DA* l4da_filereadline_delim(FILE*, int);
 L4DA* l4da_dup(const L4DA*);
 int l4da_combine(L4DA*, const L4DA*);
 
+void* l4da_drop_struct(L4DA*);
+L4DA* l4da_make_struct(void*, int, int, int);
+
 /*********** 二維陣列 (其實是用一維陣列來模擬，功能有限) ***********/
 
 typedef struct l4lib_dyn_2darr{