add function fc_init_buffer

src/shared_func.c

@@ -3020,3 +3020,17 @@ int fc_ceil_prime(const int n)
 
     return i;
 }
+
+int fc_init_buffer(BufferInfo *buffer, const int buffer_size)
+{
+    buffer->buff = (char *)malloc(buffer_size);
+    if (buffer->buff == NULL)
+    {
+        logError("file: "__FILE__", line: %d, "
+                "malloc %d bytes fail", __LINE__, buffer_size);
+        return ENOMEM;
+    }
+    buffer->alloc_size = buffer_size;
+    buffer->length = 0;
+    return 0;
+}

src/shared_func.h

@@ -919,6 +919,14 @@ int fc_floor_prime(const int n);
 */
 int fc_ceil_prime(const int n);
 
+/** init buffer
+ *  parameters:
+ *      buffer: the buffer to init
+ *      buffer_size: the buffer size
+ *  return: error no, 0 success, != 0 fail
+*/
+int fc_init_buffer(BufferInfo *buffer, const int buffer_size);
+
 #ifdef __cplusplus
 }
 #endif