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/*
** $Id: lauxlib.c,v 1.26 2000/02/08 16:34:31 roberto Exp roberto $
** Auxiliary functions for building Lua libraries
** See Copyright Notice in lua.h
*/
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
/* This file uses only the official API of Lua.
** Any function declared here could be written as an application function.
** With care, these functions can be used by other libraries.
*/
#define LUA_REENTRANT
#include "lauxlib.h"
#include "lua.h"
#include "luadebug.h"
int luaL_findstring (const char *name, const char *const list[]) {
int i;
for (i=0; list[i]; i++)
if (strcmp(list[i], name) == 0)
return i;
return -1; /* name not found */
}
void luaL_argerror (lua_State *L, int narg, const char *extramsg) {
lua_Debug ar;
lua_getstack(L, 0, &ar);
lua_getinfo(L, "nu", &ar);
narg -= ar.nups;
if (ar.name == NULL)
ar.name = "?";
luaL_verror(L, "bad argument #%d to `%.50s' (%.100s)",
narg, ar.name, extramsg);
}
static void type_error (lua_State *L, int narg, const char *type_name,
lua_Object o) {
char buff[100];
const char *otype = (o == LUA_NOOBJECT) ? "no value" : lua_type(L, o);
sprintf(buff, "%.10s expected, got %.10s", type_name, otype);
luaL_argerror(L, narg, buff);
}
static const char *checkstr (lua_State *L, lua_Object o, int narg, long *len) {
const char *s = lua_getstring(L, o);
if (!s) type_error(L, narg, "string", o);
if (len) *len = lua_strlen(L, o);
return s;
}
const char *luaL_check_lstr (lua_State *L, int narg, long *len) {
return checkstr(L, lua_getparam(L, narg), narg, len);
}
const char *luaL_opt_lstr (lua_State *L, int narg, const char *def, long *len) {
lua_Object o = lua_getparam(L, narg);
if (o == LUA_NOOBJECT) {
if (len) *len = def ? strlen(def) : 0;
return def;
}
else return checkstr(L, o, narg, len);
}
double luaL_check_number (lua_State *L, int narg) {
lua_Object o = lua_getparam(L, narg);
if (!lua_isnumber(L, o)) type_error(L, narg, "number", o);
return lua_getnumber(L, o);
}
double luaL_opt_number (lua_State *L, int narg, double def) {
lua_Object o = lua_getparam(L, narg);
if (o == LUA_NOOBJECT) return def;
else {
if (!lua_isnumber(L, o)) type_error(L, narg, "number", o);
return lua_getnumber(L, o);
}
}
lua_Object luaL_tablearg (lua_State *L, int narg) {
lua_Object o = lua_getparam(L, narg);
if (!lua_istable(L, o)) type_error(L, narg, "table", o);
return o;
}
lua_Object luaL_functionarg (lua_State *L, int narg) {
lua_Object o = lua_getparam(L, narg);
if (!lua_isfunction(L, o)) type_error(L, narg, "function", o);
return o;
}
lua_Object luaL_nonnullarg (lua_State *L, int narg) {
lua_Object o = lua_getparam(L, narg);
luaL_arg_check(L, o != LUA_NOOBJECT, narg, "value expected");
return o;
}
void luaL_openlib (lua_State *L, const struct luaL_reg *l, int n) {
int i;
for (i=0; i<n; i++)
lua_register(L, l[i].name, l[i].func);
}
void luaL_verror (lua_State *L, const char *fmt, ...) {
char buff[500];
va_list argp;
va_start(argp, fmt);
vsprintf(buff, fmt, argp);
va_end(argp);
lua_error(L, buff);
}
#define EXTRALEN sizeof("string \"...\"0")
void luaL_chunkid (char *out, const char *source, int len) {
if (*source == '(') {
strncpy(out, source+1, len-1); /* remove first char */
out[len-1] = '\0'; /* make sure `out' has an end */
out[strlen(out)-1] = '\0'; /* remove last char */
}
else {
len -= EXTRALEN;
if (*source == '@')
sprintf(out, "file `%.*s'", len, source+1);
else {
const char *b = strchr(source , '\n'); /* stop at first new line */
int lim = (b && (b-source)<len) ? b-source : len;
sprintf(out, "string \"%.*s\"", lim, source);
strcpy(out+lim+(EXTRALEN-sizeof("...\"0")), "...\"");
}
}
}
void luaL_filesource (char *out, const char *filename, int len) {
if (filename == NULL) filename = "(stdin)";
sprintf(out, "@%.*s", len-2, filename); /* -2 for '@' and '\0' */
}
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