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128 lines
3.0 KiB
128 lines
3.0 KiB
/*
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** $Id: lauxlib.c,v 1.14 1999/02/25 19:13:56 roberto Exp roberto $
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** Auxiliary 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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/* Please Notice: This file uses only the official API of Lua
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** Any function declared here could be written as an application function.
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** With care, these functions can be used by other libraries.
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*/
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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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int luaL_findstring (char *name, char *list[]) {
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int i;
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for (i=0; list[i]; i++)
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if (strcmp(list[i], name) == 0)
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return i;
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return -1; /* name not found */
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}
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void luaL_argerror (int numarg, char *extramsg) {
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lua_Function f = lua_stackedfunction(0);
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char *funcname;
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lua_getobjname(f, &funcname);
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numarg -= lua_nups(f);
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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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char *luaL_check_lstr (int numArg, long *len)
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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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if (len) *len = lua_strlen(o);
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return lua_getstring(o);
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}
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char *luaL_opt_lstr (int numArg, char *def, long *len)
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{
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return (lua_getparam(numArg) == LUA_NOOBJECT) ? def :
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luaL_check_lstr(numArg, len);
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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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void luaL_chunkid (char *out, char *source, int len) {
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len -= 13; /* 13 = strlen("string ''...\0") */
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if (*source == '@')
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sprintf(out, "file `%.*s'", len, source+1);
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else if (*source == '(')
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strcpy(out, "(C code)");
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else {
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char *b = strchr(source , '\n'); /* stop string at first new line */
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int lim = (b && (b-source)<len) ? b-source : len;
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sprintf(out, "string `%.*s'", lim, source);
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strcpy(out+lim+(13-5), "...'"); /* 5 = strlen("...'\0") */
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}
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}
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