lua/inout.c

301 lines
6.0 KiB
C

/*
** 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 2.42 1996/09/24 21:46:44 roberto Exp roberto $";
#include <stdio.h>
#include <string.h>
#include "lex.h"
#include "opcode.h"
#include "inout.h"
#include "table.h"
#include "tree.h"
#include "lua.h"
#include "mem.h"
/* 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)
{
int c = fgetc(fp);
return (c == EOF) ? 0 : c;
}
/*
** 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 the file.
*/
FILE *lua_openfile (char *fn)
{
lua_setinput (fileinput);
if (fn == NULL)
{
fp = stdin;
fn = "(stdin)";
}
else
fp = fopen (fn, "r");
if (fp == NULL)
return NULL;
lua_parsedfile = luaI_createfixedstring(fn)->str;
return fp;
}
/*
** 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
*/
#define SIZE_PREF 20 /* size of string prefix to appear in error messages */
void lua_openstring (char *s)
{
char buff[SIZE_PREF+25];
lua_setinput(stringinput);
st = s;
strcpy(buff, "(dostring) >> ");
strncat(buff, s, SIZE_PREF);
if (strlen(s) > SIZE_PREF) strcat(buff, "...");
lua_parsedfile = luaI_createfixedstring(buff)->str;
}
/*
** Function to close an opened string
*/
void lua_closestring (void)
{
}
static void check_arg (int cond, char *func)
{
if (!cond)
{
char buff[100];
sprintf(buff, "incorrect argument to function `%s'", func);
lua_error(buff);
}
}
static int passresults (void)
{
int arg = 0;
lua_Object obj;
while ((obj = lua_getresult(++arg)) != LUA_NOOBJECT)
lua_pushobject(obj);
return arg-1;
}
/*
** Internal function: do a string
*/
void lua_internaldostring (void)
{
lua_Object obj = lua_getparam (1);
if (lua_isstring(obj) && lua_dostring(lua_getstring(obj)) == 0)
if (passresults() == 0)
lua_pushuserdata(NULL); /* at least one result to signal no errors */
}
/*
** 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) == 0)
if (passresults() == 0)
lua_pushuserdata(NULL); /* at least one result to signal no errors */
}
static char *tostring (lua_Object obj)
{
char *buff = luaI_buffer(20);
if (lua_isstring(obj)) /* get strings and numbers */
return lua_getstring(obj);
else switch(lua_type(obj))
{
case LUA_T_FUNCTION:
sprintf(buff, "function: %p", (luaI_Address(obj))->value.tf);
break;
case LUA_T_CFUNCTION:
sprintf(buff, "cfunction: %p", lua_getcfunction(obj));
break;
case LUA_T_ARRAY:
sprintf(buff, "table: %p", avalue(luaI_Address(obj)));
break;
case LUA_T_NIL:
sprintf(buff, "nil");
break;
default:
sprintf(buff, "userdata: %p", lua_getuserdata(obj));
break;
}
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_pushnumber(lua_getnumber(o));
}
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);
check_arg(lua_isstring(name), "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);
check_arg(lua_isstring(name), "getglobal");
lua_pushobject(lua_getglobal(lua_getstring(name)));
}
#define MAXPARAMS 256
void luaI_call (void)
{
lua_Object f = lua_getparam(1);
lua_Object arg = lua_getparam(2);
lua_Object temp, params[MAXPARAMS];
int narg, i;
check_arg(lua_istable(arg), "call");
check_arg(lua_isfunction(f), "call");
/* narg = arg.n */
lua_pushobject(arg);
lua_pushstring("n");
temp = lua_getsubscript();
narg = lua_isnumber(temp) ? lua_getnumber(temp) : MAXPARAMS+1;
/* read arg[1...n] */
for (i=0; i<narg; i++) {
if (i>=MAXPARAMS)
lua_error("argument list too long in function `call'");
lua_pushobject(arg);
lua_pushnumber(i+1);
params[i] = lua_getsubscript();
if (narg == MAXPARAMS+1 && lua_isnil(params[i])) {
narg = i;
break;
}
}
/* push parameters and do the call */
for (i=0; i<narg; i++)
lua_pushobject(params[i]);
if (lua_callfunction(f))
lua_error(NULL);
else
passresults();
}