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/*
Clif - A C-like Interpreter Framework
Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997 T. Hruz, L. Koren
1998 L. Koren
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* \verbatim{input_c.tex} */
/*
* input.c
*
* Initialization of the main compiler
* and redefinition of its input functions.
* Different input function are used during
* synchronous and asynchronous interrupt
* handling.
*/
#include <stdio.h>
#include <fcntl.h>
#include "global.h"
#include "lex_t.h"
#include "input.h"
extern FILEATTR pf, spf[];
#ifndef FLEX_SCANNER
extern int yylineno;
extern int yytchar;
extern char *yysptr, yysbuf[];
extern int getcx PROTO((FILE *));
static int buf_pointer = 0;
#else
extern FILE *yyin;
#endif
#define U(x) x
int (*input) PROTO((void));
char string_resume[]="resume;"; /* Buffer for input by return
* from asynchronous interrupt.
*/
extern int no_compile_only; /* Flag in the case of errors or */
/* compile only. */
extern int handle_main; /* If set, compiler like behavior. */
extern int source_line_number;
/* Source line number. Detecting if */
/* the current line was already */
/* printed. Using in error messages. */
extern void exit_file_scope PROTO((void));
#ifndef FLEX_SCANNER
/*
* Redefinition of the input for the main compiler.
*/
int
input_komp ()
{
#ifdef DEBUG_INTER
printfx("in front of getc in input\n");
#endif
yytchar=yysptr>yysbuf?U(*--yysptr):getcx(pf.fp);
#ifdef DEBUG_INTER
printfx("behind of getc in input, read character %c - %x\n",
yytchar, yytchar);
#endif
if(yytchar == '\n') /* LF */
{
yylineno++;
spf[s].line_counter++;
char_counter = 0;
line_buf[0] = 0;
}
if(yytchar == EOF) /* Is current char EOF? */
{
if (s > 0)
{
spf[s].line_counter = 1; /* Counting lines from beginning. */
source_line_number = 0; /* Resetting line number in the */
/* presence of errors. */
fclose (spf[s].fp);
exit_file_scope ();
s = s - 1;
if (! s && ! no_compile_only)
return 0;
/* If we want compiler-like behavior, don't switch to
stdin. */
if (! s && handle_main)
return 0;
pf = spf[s]; /* Move to the next opened file. */
}
#ifdef DEBUG_INTER
printfx ("in front of the second getc in input\n");
#endif
yytchar = yysptr>yysbuf?U(*--yysptr):getcx(pf.fp); /* The first char */
#ifdef DEBUG_INTER
printfx ("behind of the second getc in input, read character %c - %x\n",
yytchar, yytchar);
#endif
}
return (yytchar);
}
/*
* Redefinition of the input for the main compiler.
* It is used during an interrupt.
*/
int
input_std ()
{
#ifdef DEBUG_INTER
printfx ("in front of the third getc in input\n");
#endif
yytchar = yysptr>yysbuf?U(*--yysptr):getcx(stdin);
#ifdef DEBUG_INTER
printfx ("behind of the third getc in input, read character %c - %x\n",
yytchar, yytchar);
#endif
if (yytchar == '\n') /* LF */
{
yylineno++;
spf[s].line_counter++;
char_counter = 0;
line_buf[0] = 0;
}
#ifndef NOT_MSWIN_AND_YES_DOS
if (HANDLER_TEST)
{
HANDLER_SET;
input = input_buf;
buf_pointer = 0;
return (input_buf());
}
#endif
return (yytchar);
}
/*
* Redefinition of the input for the main compiler.
* It is used by return from an interrupt.
*/
int
input_buf ()
{
yytchar = yysptr>yysbuf?U(*--yysptr):string_resume[buf_pointer++];
if (yytchar == '\n') /* LF */
{
yylineno++;
spf[s].line_counter++;
char_counter = 0;
line_buf[0] = 0;
}
return (yytchar);
}
#else
int
terminate_buffer ()
{
fclose (spf[s].fp);
spf[s].fp = NULL;
spf[s].name = NULL;
spf[s--].line_counter = 1;
source_line_number = 0;
exit_file_scope ();
/* Do not switch to stdin, if the user wants compiler-like
behavior. */
if (! s && handle_main)
return 1;
return (! s && ! no_compile_only);
}
#endif /* FLEX_SCANNER */
/*
* Initialization of the main compiler input.
*/
int
init_input (argc1, argv1)
int argc1;
char *argv1[];
{
int b;
#ifndef FLEX_SCANNER
input = input_komp;
#endif
s = argc1 - 1;
spf[0].fp = stdin;
spf[0].name = "stdin";
spf[0].line_counter = 1;
for (b = 1; b < argc1; b++)
/* File opening and storing their pointer. */
{
spf[argc1 - b].fp = fopen(argv1[b],"r");
spf[argc1 - b].name = argv1[b];
spf[argc1 - b].line_counter = 1;
if (spf[argc1-b].fp == NULL)
{
s = argc1 - b;
error_message (7001);
return (-1);
}
}
/*
* Takes the first file pointer from the stack.
*/
#ifdef FLEX_SCANNER
yyin = spf[s].fp;
#else
pf.fp = spf[s].fp;
#endif
return 0;
}
/* \verbatim */
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