1999-05-03 09:29:11 +02:00
|
|
|
|
/* input_file.c - Deal with Input Files -
|
2001-03-09 00:24:26 +01:00
|
|
|
|
Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1999, 2000
|
1999-06-03 02:24:14 +02:00
|
|
|
|
Free Software Foundation, Inc.
|
1999-05-03 09:29:11 +02:00
|
|
|
|
|
|
|
|
|
This file is part of GAS, the GNU Assembler.
|
|
|
|
|
|
|
|
|
|
GAS 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, or (at your option)
|
|
|
|
|
any later version.
|
|
|
|
|
|
|
|
|
|
GAS 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
|
1999-06-03 02:24:14 +02:00
|
|
|
|
along with GAS; see the file COPYING. If not, write to the Free
|
|
|
|
|
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
|
|
|
|
|
02111-1307, USA. */
|
1999-05-03 09:29:11 +02:00
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Confines all details of reading source bytes to this module.
|
|
|
|
|
* All O/S specific crocks should live here.
|
|
|
|
|
* What we lose in "efficiency" we gain in modularity.
|
|
|
|
|
* Note we don't need to #include the "as.h" file. No common coupling!
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
#include <stdio.h>
|
|
|
|
|
#include <string.h>
|
|
|
|
|
|
|
|
|
|
#include "as.h"
|
|
|
|
|
#include "input-file.h"
|
|
|
|
|
|
1999-06-03 02:24:14 +02:00
|
|
|
|
static int input_file_get PARAMS ((char *, int));
|
1999-05-03 09:29:11 +02:00
|
|
|
|
|
|
|
|
|
/* This variable is non-zero if the file currently being read should be
|
|
|
|
|
preprocessed by app. It is zero if the file can be read straight in.
|
|
|
|
|
*/
|
|
|
|
|
int preprocess = 0;
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* This code opens a file, then delivers BUFFER_SIZE character
|
|
|
|
|
* chunks of the file on demand.
|
|
|
|
|
* BUFFER_SIZE is supposed to be a number chosen for speed.
|
|
|
|
|
* The caller only asks once what BUFFER_SIZE is, and asks before
|
|
|
|
|
* the nature of the input files (if any) is known.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
#define BUFFER_SIZE (32 * 1024)
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* We use static data: the data area is not sharable.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
static FILE *f_in;
|
|
|
|
|
static char *file_name;
|
|
|
|
|
|
|
|
|
|
/* Struct for saving the state of this module for file includes. */
|
2000-11-06 22:55:46 +01:00
|
|
|
|
struct saved_file {
|
|
|
|
|
FILE *f_in;
|
|
|
|
|
char *file_name;
|
|
|
|
|
int preprocess;
|
|
|
|
|
char *app_save;
|
|
|
|
|
};
|
1999-05-03 09:29:11 +02:00
|
|
|
|
|
2000-09-09 22:23:15 +02:00
|
|
|
|
/* These hooks accomodate most operating systems. */
|
1999-05-03 09:29:11 +02:00
|
|
|
|
|
2000-09-09 22:23:15 +02:00
|
|
|
|
void
|
1999-05-03 09:29:11 +02:00
|
|
|
|
input_file_begin ()
|
|
|
|
|
{
|
|
|
|
|
f_in = (FILE *) 0;
|
|
|
|
|
}
|
|
|
|
|
|
2000-09-09 22:23:15 +02:00
|
|
|
|
void
|
1999-05-03 09:29:11 +02:00
|
|
|
|
input_file_end ()
|
|
|
|
|
{
|
|
|
|
|
}
|
|
|
|
|
|
2000-09-09 22:23:15 +02:00
|
|
|
|
/* Return BUFFER_SIZE. */
|
|
|
|
|
unsigned int
|
1999-05-03 09:29:11 +02:00
|
|
|
|
input_file_buffer_size ()
|
|
|
|
|
{
|
|
|
|
|
return (BUFFER_SIZE);
|
|
|
|
|
}
|
|
|
|
|
|
2000-09-09 22:23:15 +02:00
|
|
|
|
int
|
1999-05-03 09:29:11 +02:00
|
|
|
|
input_file_is_open ()
|
|
|
|
|
{
|
|
|
|
|
return f_in != (FILE *) 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Push the state of our input, returning a pointer to saved info that
|
|
|
|
|
can be restored with input_file_pop (). */
|
|
|
|
|
char *
|
|
|
|
|
input_file_push ()
|
|
|
|
|
{
|
|
|
|
|
register struct saved_file *saved;
|
|
|
|
|
|
|
|
|
|
saved = (struct saved_file *) xmalloc (sizeof *saved);
|
|
|
|
|
|
|
|
|
|
saved->f_in = f_in;
|
|
|
|
|
saved->file_name = file_name;
|
|
|
|
|
saved->preprocess = preprocess;
|
|
|
|
|
if (preprocess)
|
|
|
|
|
saved->app_save = app_push ();
|
|
|
|
|
|
|
|
|
|
input_file_begin (); /* Initialize for new file */
|
|
|
|
|
|
|
|
|
|
return (char *) saved;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
|
input_file_pop (arg)
|
|
|
|
|
char *arg;
|
|
|
|
|
{
|
|
|
|
|
register struct saved_file *saved = (struct saved_file *) arg;
|
|
|
|
|
|
|
|
|
|
input_file_end (); /* Close out old file */
|
|
|
|
|
|
|
|
|
|
f_in = saved->f_in;
|
|
|
|
|
file_name = saved->file_name;
|
|
|
|
|
preprocess = saved->preprocess;
|
|
|
|
|
if (preprocess)
|
|
|
|
|
app_pop (saved->app_save);
|
|
|
|
|
|
|
|
|
|
free (arg);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
|
input_file_open (filename, pre)
|
2000-09-09 22:23:15 +02:00
|
|
|
|
char *filename; /* "" means use stdin. Must not be 0. */
|
1999-05-03 09:29:11 +02:00
|
|
|
|
int pre;
|
|
|
|
|
{
|
|
|
|
|
int c;
|
|
|
|
|
char buf[80];
|
|
|
|
|
|
|
|
|
|
preprocess = pre;
|
|
|
|
|
|
2000-09-09 22:23:15 +02:00
|
|
|
|
assert (filename != 0); /* Filename may not be NULL. */
|
1999-05-03 09:29:11 +02:00
|
|
|
|
if (filename[0])
|
2000-09-09 22:23:15 +02:00
|
|
|
|
{ /* We have a file name. Suck it and see. */
|
1999-05-03 09:29:11 +02:00
|
|
|
|
f_in = fopen (filename, "r");
|
|
|
|
|
file_name = filename;
|
|
|
|
|
}
|
|
|
|
|
else
|
2000-09-09 22:23:15 +02:00
|
|
|
|
{ /* use stdin for the input file. */
|
1999-05-03 09:29:11 +02:00
|
|
|
|
f_in = stdin;
|
2000-09-09 22:23:15 +02:00
|
|
|
|
file_name = _("{standard input}"); /* For error messages. */
|
1999-05-03 09:29:11 +02:00
|
|
|
|
}
|
|
|
|
|
if (f_in == (FILE *) 0)
|
|
|
|
|
{
|
|
|
|
|
as_bad (_("Can't open %s for reading."), file_name);
|
|
|
|
|
as_perror ("%s", file_name);
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
c = getc (f_in);
|
|
|
|
|
if (c == '#')
|
|
|
|
|
{ /* Begins with comment, may not want to preprocess */
|
|
|
|
|
c = getc (f_in);
|
|
|
|
|
if (c == 'N')
|
|
|
|
|
{
|
|
|
|
|
fgets (buf, 80, f_in);
|
|
|
|
|
if (!strcmp (buf, "O_APP\n"))
|
|
|
|
|
preprocess = 0;
|
|
|
|
|
if (!strchr (buf, '\n'))
|
|
|
|
|
ungetc ('#', f_in); /* It was longer */
|
|
|
|
|
else
|
|
|
|
|
ungetc ('\n', f_in);
|
|
|
|
|
}
|
|
|
|
|
else if (c == '\n')
|
|
|
|
|
ungetc ('\n', f_in);
|
|
|
|
|
else
|
|
|
|
|
ungetc ('#', f_in);
|
|
|
|
|
}
|
|
|
|
|
else
|
|
|
|
|
ungetc (c, f_in);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Close input file. */
|
2000-09-09 22:23:15 +02:00
|
|
|
|
void
|
1999-05-03 09:29:11 +02:00
|
|
|
|
input_file_close ()
|
|
|
|
|
{
|
|
|
|
|
if (f_in != NULL)
|
|
|
|
|
{
|
|
|
|
|
fclose (f_in);
|
|
|
|
|
} /* don't close a null file pointer */
|
|
|
|
|
f_in = 0;
|
2000-11-06 22:55:46 +01:00
|
|
|
|
}
|
1999-05-03 09:29:11 +02:00
|
|
|
|
|
|
|
|
|
/* This function is passed to do_scrub_chars. */
|
|
|
|
|
|
|
|
|
|
static int
|
1999-06-03 02:24:14 +02:00
|
|
|
|
input_file_get (buf, buflen)
|
|
|
|
|
char *buf;
|
|
|
|
|
int buflen;
|
1999-05-03 09:29:11 +02:00
|
|
|
|
{
|
|
|
|
|
int size;
|
|
|
|
|
|
1999-06-03 02:24:14 +02:00
|
|
|
|
size = fread (buf, sizeof (char), buflen, f_in);
|
1999-05-03 09:29:11 +02:00
|
|
|
|
if (size < 0)
|
|
|
|
|
{
|
|
|
|
|
as_perror (_("Can't read from %s"), file_name);
|
|
|
|
|
size = 0;
|
|
|
|
|
}
|
|
|
|
|
return size;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Read a buffer from the input file. */
|
|
|
|
|
|
|
|
|
|
char *
|
|
|
|
|
input_file_give_next_buffer (where)
|
2000-09-09 22:23:15 +02:00
|
|
|
|
char *where; /* Where to place 1st character of new buffer. */
|
1999-05-03 09:29:11 +02:00
|
|
|
|
{
|
2000-09-09 22:23:15 +02:00
|
|
|
|
char *return_value; /* -> Last char of what we read, + 1. */
|
1999-05-03 09:29:11 +02:00
|
|
|
|
register int size;
|
|
|
|
|
|
|
|
|
|
if (f_in == (FILE *) 0)
|
|
|
|
|
return 0;
|
|
|
|
|
/*
|
|
|
|
|
* fflush (stdin); could be done here if you want to synchronise
|
|
|
|
|
* stdin and stdout, for the case where our input file is stdin.
|
|
|
|
|
* Since the assembler shouldn't do any output to stdout, we
|
|
|
|
|
* don't bother to synch output and input.
|
|
|
|
|
*/
|
|
|
|
|
if (preprocess)
|
|
|
|
|
size = do_scrub_chars (input_file_get, where, BUFFER_SIZE);
|
|
|
|
|
else
|
|
|
|
|
size = fread (where, sizeof (char), BUFFER_SIZE, f_in);
|
|
|
|
|
if (size < 0)
|
|
|
|
|
{
|
|
|
|
|
as_perror (_("Can't read from %s"), file_name);
|
|
|
|
|
size = 0;
|
|
|
|
|
}
|
|
|
|
|
if (size)
|
|
|
|
|
return_value = where + size;
|
|
|
|
|
else
|
|
|
|
|
{
|
|
|
|
|
if (fclose (f_in))
|
|
|
|
|
as_perror (_("Can't close %s"), file_name);
|
|
|
|
|
f_in = (FILE *) 0;
|
|
|
|
|
return_value = 0;
|
|
|
|
|
}
|
|
|
|
|
return (return_value);
|
|
|
|
|
}
|