diff --git a/src/buf.c b/src/buf.c
index ed08886..08cc01f 100644
--- a/src/buf.c
+++ b/src/buf.c
@@ -40,7 +40,7 @@ f2b_buf_append(f2b_buf_t *buf, const char *str, size_t len) {
 }
 
 /**
- * @brief  Extracts line terminated by '\r', '\n'
+ * @brief  Extracts line terminated by delimiter
  * @return Pointer to extracted string on success or NULL otherwise
  * @note Use only with 'read' buffer type
  */
@@ -65,10 +65,23 @@ f2b_buf_extract(f2b_buf_t *buf, const char *end) {
 
   /* shift data inside buffer */
   len += strlen(end);
-  assert(buf->used >= len);
+  f2b_buf_splice(buf, len);
+
+  return s;
+}
+
+size_t
+f2b_buf_splice(f2b_buf_t *buf, size_t len) {
+  assert(buf != NULL);
+
+  if (len == 0)
+    return len;
+
+  if (buf->used <= len)
+    len = buf->used;
+
   buf->used -= len,
   memmove(buf->data, &buf->data[len], buf->used);
   buf->data[buf->used] = '\0';
-
-  return s;
+  return len;
 }
diff --git a/src/buf.h b/src/buf.h
index 31d5472..0779112 100644
--- a/src/buf.h
+++ b/src/buf.h
@@ -11,5 +11,6 @@ bool   f2b_buf_alloc(f2b_buf_t *buf, size_t max);
 void   f2b_buf_free(f2b_buf_t *buf);
 bool   f2b_buf_append(f2b_buf_t *buf, const char *str, size_t size);
 char * f2b_buf_extract(f2b_buf_t *buf, const char *end);
+size_t f2b_buf_splice(f2b_buf_t *buf, size_t len);
 
 #endif /* F2B_BUF_H_ */
diff --git a/t/t_buf.c b/t/t_buf.c
index 129b487..5055941 100644
--- a/t/t_buf.c
+++ b/t/t_buf.c
@@ -5,6 +5,7 @@ int main() {
   f2b_buf_t buf;
   char *line;
   bool ret;
+  int len;
 
   memset(&buf, 0x0, sizeof(buf));
 
@@ -39,6 +40,25 @@ int main() {
   assert(buf.used == 0);
   free(line);
 
+  f2b_buf_append(&buf, "test4\n\n", 6);
+  assert(buf.used == 6);
+  assert(strcmp(buf.data, "test4\n") == 0);
+
+  len = f2b_buf_splice(&buf, 0);
+  assert(len == 0);
+  assert(buf.used == 6);
+  assert(strcmp(buf.data, "test4\n") == 0);
+
+  len = f2b_buf_splice(&buf, 2);
+  assert(len == 2);
+  assert(buf.used == 4);
+  assert(strcmp(buf.data, "st4\n") == 0);
+
+  len = f2b_buf_splice(&buf, 6);
+  assert(len == 4);
+  assert(buf.used == 0);
+  assert(buf.data[0] == '\0');
+
   f2b_buf_free(&buf);
   assert(buf.used == 0);
   assert(buf.size == 0);