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util-src/strbitop.c @ 12446:e54b8a5e35ad 0.12
util.random: Test whether util.crand works before using it (fix #1734)
util.crand can be configured at compile time to use the Linux
getrandom() system call, available from Linux 3.17, but it is still
possible to load it with an older kernel lacking that system call, where
attempting to use it throws an ENOSYS error.
By testing for this on load we can fall back to /dev/urandom in this
case.
author | Kim Alvefur <zash@zash.se> |
---|---|
date | Sat, 02 Apr 2022 16:33:27 +0200 |
parent | 11175:235537247aa3 |
child | 12469:2b3adaa6d38e |
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/* * 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; }