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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 2.24 1995/10/23 13:54:11 roberto Exp roberto $";
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "mem.h"
#include "opcode.h"
#include "hash.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;
Bool lua_debug = 0;
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 error message on error.
*/
char *lua_openfile (char *fn)
{
lua_setinput (fileinput);
if (fn == NULL)
{
fp = stdin;
fn = "(stdin)";
}
else
fp = fopen (fn, "r");
if (fp == NULL)
{
static char buff[255];
sprintf(buff, "unable to open file `%.200s'", fn);
return buff;
}
lua_linenumber = 1;
lua_parsedfile = lua_constcreate(fn)->ts.str;
return NULL;
}
/*
** 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)")->ts.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);
if (lua_isstring(obj) && !lua_dofile(lua_getstring(obj)))
lua_pushnumber(1);
else
lua_pushnil();
}
/*
** Internal function: print object values
*/
void lua_print (void)
{
int i=1;
lua_Object obj;
while ((obj=lua_getparam (i++)) != LUA_NOOBJECT)
{
if (lua_isnumber(obj)) printf("%g\n",lua_getnumber(obj));
else if (lua_isstring(obj)) printf("%s\n",lua_getstring(obj));
else if (lua_isfunction(obj)) printf("function: %p\n",(luaI_Address(obj))->value.tf);
else if (lua_iscfunction(obj)) printf("cfunction: %p\n",lua_getcfunction(obj)
);
else if (lua_isuserdata(obj)) printf("userdata: %p\n",lua_getuserdata(obj));
else if (lua_istable(obj)) printf("table: %p\n",avalue(luaI_Address(obj)));
else if (lua_isnil(obj)) printf("nil\n");
else printf("invalid value to print\n");
}
}
/*
** 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);
}
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