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/*
** inout.c
** Provide function to realise the input/output function and debugger
** facilities.
** Also provides some predefined lua functions.
*/
char *rcs_inout="$Id: inout.c,v 2.31 1996/02/13 17:30:39 roberto Exp roberto $";
#include <stdio.h>
#include <stdlib.h>
#include "lex.h"
#include "opcode.h"
#include "inout.h"
#include "table.h"
#include "tree.h"
#include "lua.h"
#ifndef MAXFUNCSTACK
#define MAXFUNCSTACK 100
#endif
#define MAXMESSAGE MAXFUNCSTACK*80
/* Exported variables */
Word lua_linenumber;
char *lua_parsedfile;
static FILE *fp;
static char *st;
/*
** Function to get the next character from the input file
*/
static int fileinput (void)
{
return fgetc (fp);
}
/*
** Function to get the next character from the input string
*/
static int stringinput (void)
{
return *st++;
}
/*
** Function to open a file to be input unit.
** Return 0 on success or 1 error.
*/
int lua_openfile (char *fn)
{
lua_setinput (fileinput);
if (fn == NULL)
{
fp = stdin;
fn = "(stdin)";
}
else
fp = fopen (fn, "r");
if (fp == NULL)
return 1;
lua_linenumber = 1;
lua_parsedfile = lua_constcreate(fn)->str;
return 0;
}
/*
** Function to close an opened file
*/
void lua_closefile (void)
{
if (fp != NULL && fp != stdin)
{
fclose (fp);
fp = NULL;
}
}
/*
** Function to open a string to be input unit
*/
void lua_openstring (char *s)
{
lua_setinput (stringinput);
st = s;
lua_linenumber = 1;
lua_parsedfile = lua_constcreate("(string)")->str;
}
/*
** Function to close an opened string
*/
void lua_closestring (void)
{
}
/*
** Internal function: do a string
*/
void lua_internaldostring (void)
{
lua_Object obj = lua_getparam (1);
if (lua_isstring(obj) && !lua_dostring(lua_getstring(obj)))
lua_pushnumber(1);
else
lua_pushnil();
}
/*
** Internal function: do a file
*/
void lua_internaldofile (void)
{
lua_Object obj = lua_getparam (1);
char *fname = NULL;
if (lua_isstring(obj))
fname = lua_getstring(obj);
else if (obj != LUA_NOOBJECT)
lua_error("invalid argument to function `dofile'");
/* else fname = NULL */
if (!lua_dofile(fname))
lua_pushnumber(1);
else
lua_pushnil();
}
static char *tostring (lua_Object obj)
{
static char buff[20];
if (lua_isstring(obj))
return lua_getstring(obj);
if (lua_isnumber(obj))
sprintf(buff, "%g", lua_getnumber(obj));
else if (lua_isfunction(obj))
sprintf(buff, "function: %p", (luaI_Address(obj))->value.tf);
else if (lua_iscfunction(obj))
sprintf(buff, "cfunction: %p", lua_getcfunction(obj));
else if (lua_isuserdata(obj))
sprintf(buff, "userdata: %p", lua_getuserdata(obj));
else if (lua_istable(obj))
sprintf(buff, "table: %p", avalue(luaI_Address(obj)));
else if (lua_isnil(obj))
sprintf(buff, "nil");
else buff[0] = 0;
return buff;
}
void luaI_tostring (void)
{
lua_pushstring(tostring(lua_getparam(1)));
}
void luaI_print (void)
{
int i = 1;
lua_Object obj;
while ((obj = lua_getparam(i++)) != LUA_NOOBJECT)
printf("%s\n", tostring(obj));
}
/*
** Internal function: return an object type.
*/
void luaI_type (void)
{
lua_Object o = lua_getparam(1);
int t;
if (o == LUA_NOOBJECT)
lua_error("no parameter to function 'type'");
t = lua_type(o);
switch (t)
{
case LUA_T_NIL :
lua_pushliteral("nil");
break;
case LUA_T_NUMBER :
lua_pushliteral("number");
break;
case LUA_T_STRING :
lua_pushliteral("string");
break;
case LUA_T_ARRAY :
lua_pushliteral("table");
break;
case LUA_T_FUNCTION :
case LUA_T_CFUNCTION :
lua_pushliteral("function");
break;
default :
lua_pushliteral("userdata");
break;
}
lua_pushnumber(t);
}
/*
** Internal function: convert an object to a number
*/
void lua_obj2number (void)
{
lua_Object o = lua_getparam(1);
if (lua_isnumber(o))
lua_pushobject(o);
else if (lua_isstring(o))
{
char c;
float f;
if (sscanf(lua_getstring(o),"%f %c",&f,&c) == 1)
lua_pushnumber(f);
else
lua_pushnil();
}
else
lua_pushnil();
}
void luaI_error (void)
{
char *s = lua_getstring(lua_getparam(1));
if (s == NULL) s = "(no message)";
lua_error(s);
}
void luaI_assert (void)
{
lua_Object p = lua_getparam(1);
if (p == LUA_NOOBJECT || lua_isnil(p))
lua_error("assertion failed!");
}
void luaI_setglobal (void)
{
lua_Object name = lua_getparam(1);
lua_Object value = lua_getparam(2);
if (!lua_isstring(name))
lua_error("incorrect argument to function `setglobal'");
lua_pushobject(value);
lua_storeglobal(lua_getstring(name));
lua_pushobject(value); /* return given value */
}
void luaI_getglobal (void)
{
lua_Object name = lua_getparam(1);
if (!lua_isstring(name))
lua_error("incorrect argument to function `getglobal'");
lua_pushobject(lua_getglobal(lua_getstring(name)));
}
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