mirror of https://github.com/lua/lua
102 lines
2.1 KiB
C
102 lines
2.1 KiB
C
/*
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** $Id: lauxlib.c,v 1.4 1997/11/21 19:00:46 roberto Exp roberto $
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** Auxiliar functions for building Lua libraries
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** See Copyright Notice in lua.h
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*/
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#include "lauxlib.h"
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#include "lua.h"
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#include "luadebug.h"
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void luaL_arg_check (int cond, int numarg, char *extramsg)
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{
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if (!cond) {
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char *funcname;
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lua_getobjname(lua_stackedfunction(0), &funcname);
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if (funcname == NULL)
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funcname = "???";
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if (extramsg == NULL)
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luaL_verror("bad argument #%d to function `%.50s'", numarg, funcname);
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else
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luaL_verror("bad argument #%d to function `%.50s' (%.100s)",
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numarg, funcname, extramsg);
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}
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}
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char *luaL_check_string (int numArg)
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{
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lua_Object o = lua_getparam(numArg);
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luaL_arg_check(lua_isstring(o), numArg, "string expected");
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return lua_getstring(o);
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}
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char *luaL_opt_string (int numArg, char *def)
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{
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return (lua_getparam(numArg) == LUA_NOOBJECT) ? def :
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luaL_check_string(numArg);
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}
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double luaL_check_number (int numArg)
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{
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lua_Object o = lua_getparam(numArg);
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luaL_arg_check(lua_isnumber(o), numArg, "number expected");
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return lua_getnumber(o);
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}
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double luaL_opt_number (int numArg, double def)
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{
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return (lua_getparam(numArg) == LUA_NOOBJECT) ? def :
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luaL_check_number(numArg);
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}
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lua_Object luaL_tablearg (int arg)
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{
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lua_Object o = lua_getparam(arg);
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luaL_arg_check(lua_istable(o), arg, "table expected");
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return o;
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}
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lua_Object luaL_functionarg (int arg)
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{
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lua_Object o = lua_getparam(arg);
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luaL_arg_check(lua_isfunction(o), arg, "function expected");
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return o;
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}
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lua_Object luaL_nonnullarg (int numArg)
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{
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lua_Object o = lua_getparam(numArg);
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luaL_arg_check(o != LUA_NOOBJECT, numArg, "value expected");
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return o;
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}
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void luaL_openlib (struct luaL_reg *l, int n)
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{
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int i;
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lua_open(); /* make sure lua is already open */
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for (i=0; i<n; i++)
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lua_register(l[i].name, l[i].func);
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}
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void luaL_verror (char *fmt, ...)
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{
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char buff[500];
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va_list argp;
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va_start(argp, fmt);
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vsprintf(buff, fmt, argp);
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va_end(argp);
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lua_error(buff);
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}
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