author | Kim Alvefur <zash@zash.se> |
Fri, 08 Jul 2022 19:36:07 +0200 | |
changeset 12585 | 6ee9071c0a1f |
parent 12579 | 1f6f05a98fcd |
child 12980 | a187600ec7d6 |
permissions | -rw-r--r-- |
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util.strbitop: Library for bitwise operations on strings
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/* |
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* This project is MIT licensed. Please see the |
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* COPYING file in the source package for more information. |
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* |
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* Copyright (C) 2016 Kim Alvefur |
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*/ |
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#include <lua.h> |
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#include <lauxlib.h> |
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/* TODO Deduplicate code somehow */ |
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static int strop_and(lua_State *L) { |
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luaL_Buffer buf; |
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size_t a, b, i; |
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const char *str_a = luaL_checklstring(L, 1, &a); |
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const char *str_b = luaL_checklstring(L, 2, &b); |
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luaL_buffinit(L, &buf); |
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if(a == 0 || b == 0) { |
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lua_settop(L, 1); |
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return 1; |
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} |
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for(i = 0; i < a; i++) { |
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luaL_addchar(&buf, str_a[i] & str_b[i % b]); |
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} |
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luaL_pushresult(&buf); |
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return 1; |
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} |
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static int strop_or(lua_State *L) { |
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luaL_Buffer buf; |
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size_t a, b, i; |
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const char *str_a = luaL_checklstring(L, 1, &a); |
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const char *str_b = luaL_checklstring(L, 2, &b); |
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luaL_buffinit(L, &buf); |
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if(a == 0 || b == 0) { |
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lua_settop(L, 1); |
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return 1; |
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} |
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for(i = 0; i < a; i++) { |
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luaL_addchar(&buf, str_a[i] | str_b[i % b]); |
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} |
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luaL_pushresult(&buf); |
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return 1; |
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} |
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static int strop_xor(lua_State *L) { |
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luaL_Buffer buf; |
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size_t a, b, i; |
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const char *str_a = luaL_checklstring(L, 1, &a); |
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const char *str_b = luaL_checklstring(L, 2, &b); |
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luaL_buffinit(L, &buf); |
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if(a == 0 || b == 0) { |
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lua_settop(L, 1); |
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return 1; |
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} |
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for(i = 0; i < a; i++) { |
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luaL_addchar(&buf, str_a[i] ^ str_b[i % b]); |
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} |
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luaL_pushresult(&buf); |
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return 1; |
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} |
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LUA_API int luaopen_util_strbitop(lua_State *L) { |
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luaL_Reg exports[] = { |
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{ "sand", strop_and }, |
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{ "sor", strop_or }, |
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{ "sxor", strop_xor }, |
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{ NULL, NULL } |
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}; |
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lua_newtable(L); |
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luaL_setfuncs(L, exports, 0); |
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return 1; |
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} |