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/*
** inout.c
** Provide function to realise the input/output function and debugger
** facilities.
*/
char *rcs_inout="$Id: inout.c,v 1.2 1993/12/22 21:15:16 roberto Exp celes $";
#include <stdio.h>
#include <string.h>
#include "opcode.h"
#include "hash.h"
#include "inout.h"
#include "table.h"
#include "tree.h"
/* Exported variables */
int lua_linenumber;
int lua_debug;
int lua_debugline;
/* Internal variables */
#ifndef MAXFUNCSTACK
#define MAXFUNCSTACK 32
#endif
static struct { int file; int function; } funcstack[MAXFUNCSTACK];
static int nfuncstack=0;
static FILE *fp;
static char *st;
static void (*usererror) (char *s);
/*
** Function to set user function to handle errors.
*/
void lua_errorfunction (void (*fn) (char *s))
{
usererror = fn;
}
/*
** 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)
{
st++;
return (*(st-1));
}
/*
** Function to open a file to be input unit.
** Return 0 on success or 1 on error.
*/
int lua_openfile (char *fn)
{
lua_linenumber = 1;
lua_setinput (fileinput);
fp = fopen (fn, "r");
if (fp == NULL) return 1;
if (lua_addfile (fn)) return 1;
return 0;
}
/*
** Function to close an opened file
*/
void lua_closefile (void)
{
if (fp != NULL)
{
lua_delfile();
fclose (fp);
fp = NULL;
}
}
/*
** Function to open a string to be input unit
*/
int lua_openstring (char *s)
{
lua_linenumber = 1;
lua_setinput (stringinput);
st = s;
{
char sn[64];
sprintf (sn, "String: %10.10s...", s);
if (lua_addfile (sn)) return 1;
}
return 0;
}
/*
** Function to close an opened string
*/
void lua_closestring (void)
{
lua_delfile();
}
/*
** Call user function to handle error messages, if registred. Or report error
** using standard function (fprintf).
*/
void lua_error (char *s)
{
if (usererror != NULL) usererror (s);
else fprintf (stderr, "lua: %s\n", s);
}
/*
** Called to execute SETFUNCTION opcode, this function pushs a function into
** function stack. Return 0 on success or 1 on error.
*/
int lua_pushfunction (int file, int function)
{
if (nfuncstack >= MAXFUNCSTACK-1)
{
lua_error ("function stack overflow");
return 1;
}
funcstack[nfuncstack].file = file;
funcstack[nfuncstack].function = function;
nfuncstack++;
return 0;
}
/*
** Called to execute RESET opcode, this function pops a function from
** function stack.
*/
void lua_popfunction (void)
{
nfuncstack--;
}
/*
** Report bug building a message and sending it to lua_error function.
*/
void lua_reportbug (char *s)
{
char msg[1024];
strcpy (msg, s);
if (lua_debugline != 0)
{
int i;
if (nfuncstack > 0)
{
sprintf (strchr(msg,0),
"\n\tin statement begining at line %d in function \"%s\" of file \"%s\"",
lua_debugline, lua_varname(funcstack[nfuncstack-1].function),
lua_file[funcstack[nfuncstack-1].file]);
sprintf (strchr(msg,0), "\n\tactive stack\n");
for (i=nfuncstack-1; i>=0; i--)
sprintf (strchr(msg,0), "\t-> function \"%s\" of file \"%s\"\n",
lua_varname(funcstack[i].function),
lua_file[funcstack[i].file]);
}
else
{
sprintf (strchr(msg,0),
"\n\tin statement begining at line %d of file \"%s\"",
lua_debugline, lua_filename());
}
}
lua_error (msg);
}
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