# HG changeset patch
# User Kim Alvefur <zash@zash.se>
# Date 1657552298 -7200
# Node ID 5dd00f806e32baf9403fc961078f15a9628abd3d
# Parent  82bca7191f13797cebd66198b5aacf0d3e38bf1f
util.crypto: Use Lua 5.2 API for predictable buffer size

In Lua 5.3 LUAL_BUFFERSIZE is a macro computed from sizeof and is thus
not known at pre-processing time, so this does not work.

Since Lua 5.1 is no longer supported, we can use luaL_prepbuffsize()
which is available from Lua 5.2

diff -r 82bca7191f13 -r 5dd00f806e32 util-src/crypto.c
--- a/util-src/crypto.c	Mon Jul 11 17:01:55 2022 +0200
+++ b/util-src/crypto.c	Mon Jul 11 17:11:38 2022 +0200
@@ -485,12 +485,7 @@
 
 	luaL_buffinit(L, &sigbuf);
 
-	// COMPAT w/ Lua 5.1
-	#if LUAL_BUFFERSIZE < 128
-	#error Configured LUAL_BUFFERSIZE is too small for this operation
-	#endif
-
-	unsigned char *buffer = (unsigned char*)luaL_prepbuffer(&sigbuf);
+	unsigned char *buffer = (unsigned char*)luaL_prepbuffsize(&sigbuf, rlen+slen+32);
 	int len = i2d_ECDSA_SIG(sig, &buffer);
 	luaL_addsize(&sigbuf, len);
 	luaL_pushresult(&sigbuf);