util.ringbuffer: Add method for discarding buffered data without returning it to lua
--- a/util-src/ringbuffer.c Sat Feb 24 14:44:46 2018 +0100
+++ b/util-src/ringbuffer.c Sat Feb 24 14:45:06 2018 +0100
@@ -79,6 +79,27 @@
}
/*
+ * Move read position forward without returning the data
+ * (buffer, number) -> boolean
+ */
+int rb_discard(lua_State *L) {
+ ringbuffer *b = luaL_checkudata(L, 1, "ringbuffer_mt");
+ size_t r = luaL_checkinteger(L, 2);
+
+ if(r > b->blen) {
+ lua_pushboolean(L, 0);
+ return 1;
+ }
+
+ b->blen -= r;
+ b->rpos += r;
+ modpos(b);
+
+ lua_pushboolean(L, 1);
+ return 1;
+}
+
+/*
* Read bytes from buffer
* (buffer, number, boolean?) -> string
*/
@@ -210,6 +231,8 @@
{
lua_pushcfunction(L, rb_find);
lua_setfield(L, -2, "find");
+ lua_pushcfunction(L, rb_discard);
+ lua_setfield(L, -2, "discard");
lua_pushcfunction(L, rb_read);
lua_setfield(L, -2, "read");
lua_pushcfunction(L, rb_readuntil);