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