From fb1808b185a63dc9855f75cd282899d2bbcfe684 Mon Sep 17 00:00:00 2001
From: Kim Alvefur <zash@zash.se>
Date: Sat, 7 Sep 2019 13:37:47 +0200
Subject: util.strbitop: Library for bitwise operations on strings
---
util-src/GNUmakefile | 2 +-
util-src/makefile | 2 +-
util-src/strbitop.c | 91 ++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 93 insertions(+), 2 deletions(-)
create mode 100644 util-src/strbitop.c
(limited to 'util-src')
diff --git a/util-src/GNUmakefile b/util-src/GNUmakefile
index 054c9201..a8b3529f 100644
--- a/util-src/GNUmakefile
+++ b/util-src/GNUmakefile
@@ -7,7 +7,7 @@ INSTALL_DATA=install -m644
TARGET?=../util/
ALL=encodings.so hashes.so net.so pposix.so signal.so table.so \
- ringbuffer.so time.so poll.so compat.so
+ ringbuffer.so time.so poll.so compat.so strbitop.so
ifdef RANDOM
ALL+=crand.so
diff --git a/util-src/makefile b/util-src/makefile
index 700633b4..02bad40a 100644
--- a/util-src/makefile
+++ b/util-src/makefile
@@ -6,7 +6,7 @@ INSTALL_DATA=install -m644
TARGET?=../util/
ALL=encodings.so hashes.so net.so pposix.so signal.so table.so \
- ringbuffer.so time.so poll.so compat.so
+ ringbuffer.so time.so poll.so compat.so strbitop.so
.ifdef $(RANDOM)
ALL+=crand.so
diff --git a/util-src/strbitop.c b/util-src/strbitop.c
new file mode 100644
index 00000000..a26288e5
--- /dev/null
+++ b/util-src/strbitop.c
@@ -0,0 +1,91 @@
+/*
+ * This project is MIT licensed. Please see the
+ * COPYING file in the source package for more information.
+ *
+ * Copyright (C) 2016 Kim Alvefur
+ */
+
+#include <lua.h>
+#include <lauxlib.h>
+
+#if (LUA_VERSION_NUM == 501)
+#define luaL_setfuncs(L, R, N) luaL_register(L, NULL, R)
+#endif
+
+/* TODO Deduplicate code somehow */
+
+int strop_and(lua_State* L) {
+ luaL_Buffer buf;
+ size_t a, b, i;
+ 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;
+ }
+
+ for(i = 0; i < a; i++) {
+ luaL_addchar(&buf, str_a[i] & str_b[i % b]);
+ }
+
+ luaL_pushresult(&buf);
+ return 1;
+}
+
+int strop_or(lua_State* L) {
+ luaL_Buffer buf;
+ size_t a, b, i;
+ 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;
+ }
+
+ for(i = 0; i < a; i++) {
+ luaL_addchar(&buf, str_a[i] | str_b[i % b]);
+ }
+
+ luaL_pushresult(&buf);
+ return 1;
+}
+
+int strop_xor(lua_State* L) {
+ luaL_Buffer buf;
+ size_t a, b, i;
+ 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;
+ }
+
+ for(i = 0; i < a; i++) {
+ luaL_addchar(&buf, str_a[i] ^ str_b[i % b]);
+ }
+
+ luaL_pushresult(&buf);
+ return 1;
+}
+
+LUA_API int luaopen_util_strbitop(lua_State *L) {
+ luaL_Reg exports[] = {
+ { "sand", strop_and },
+ { "sor", strop_or },
+ { "sxor", strop_xor },
+ { NULL, NULL }
+ };
+
+ lua_newtable(L);
+ luaL_setfuncs(L, exports, 0);
+ return 1;
+}
--
cgit v1.2.3