Software / code / prosody
Changeset
11169:6dde2c9fa272 0.11
util.strbitop: Create buffer in the correct size (optimization)
This avoids dynamically growing the buffer as Lua does when luaL_addchar
is used, thus saving on realloc calls.
| author | Kim Alvefur <zash@zash.se> |
|---|---|
| date | Thu, 15 Oct 2020 16:43:30 +0200 |
| parents | 11168:cde600e2fdf9 |
| children | 11170:4bda303d54ed 11171:2c1583bb0e0f |
| files | util-src/strbitop.c |
| diffstat | 1 files changed, 13 insertions(+), 6 deletions(-) [+] |
line wrap: on
line diff
--- a/util-src/strbitop.c Thu Oct 15 16:41:51 2020 +0200 +++ b/util-src/strbitop.c Thu Oct 15 16:43:30 2020 +0200 @@ -2,7 +2,7 @@ * This project is MIT licensed. Please see the * COPYING file in the source package for more information. * - * Copyright (C) 2016 Kim Alvefur + * Copyright (C) 2016-2020 Kim Alvefur */ #include <lua.h> @@ -27,10 +27,13 @@ return 1; } + char *cbuf = luaL_buffinitsize(L, &buf, a); + for(i = 0; i < a; i++) { - luaL_addchar(&buf, str_a[i] & str_b[i % b]); + cbuf[i] = str_a[i] & str_b[i % b]; } + luaL_addsize(&buf, a); luaL_pushresult(&buf); return 1; } @@ -48,10 +51,13 @@ return 1; } + char *cbuf = luaL_buffinitsize(L, &buf, a); + for(i = 0; i < a; i++) { - luaL_addchar(&buf, str_a[i] | str_b[i % b]); + cbuf[i] = str_a[i] | str_b[i % b]; } + luaL_addsize(&buf, a); luaL_pushresult(&buf); return 1; } @@ -62,17 +68,18 @@ const char *str_a = luaL_checklstring(L, 1, &a); const char *str_b = luaL_checklstring(L, 2, &b); - luaL_buffinit(L, &buf); - if(a == 0 || b == 0) { lua_settop(L, 1); return 1; } + char *cbuf = luaL_buffinitsize(L, &buf, a); + for(i = 0; i < a; i++) { - luaL_addchar(&buf, str_a[i] ^ str_b[i % b]); + cbuf[i] = str_a[i] ^ str_b[i % b]; } + luaL_addsize(&buf, a); luaL_pushresult(&buf); return 1; }
