354 lines
8.6 KiB
C
354 lines
8.6 KiB
C
/* input_file.c - Deal with Input Files -
|
||
Copyright (C) 1987, 1990, 1991, 1992 Free Software Foundation, Inc.
|
||
|
||
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
|
||
along with GAS; see the file COPYING. If not, write to
|
||
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
|
||
|
||
/*
|
||
* 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!
|
||
*/
|
||
|
||
#ifdef USG
|
||
#define setbuffer(stream, buf, size) setvbuf((stream), (buf), _IOFBF, (size))
|
||
#endif
|
||
|
||
#include <stdio.h>
|
||
#include <assert.h>
|
||
#include <string.h>
|
||
|
||
#include "as.h"
|
||
#include "input-file.h"
|
||
|
||
/* 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.
|
||
*/
|
||
|
||
FILE *f_in;
|
||
/* static JF remove static so app.c can use file_name */
|
||
char *file_name;
|
||
|
||
/* Struct for saving the state of this module for file includes. */
|
||
struct saved_file
|
||
{
|
||
FILE *f_in;
|
||
char *file_name;
|
||
int preprocess;
|
||
char *app_save;
|
||
};
|
||
|
||
/* These hooks accomodate most operating systems. */
|
||
|
||
void
|
||
input_file_begin ()
|
||
{
|
||
f_in = (FILE *) 0;
|
||
}
|
||
|
||
void
|
||
input_file_end ()
|
||
{
|
||
}
|
||
|
||
/* Return BUFFER_SIZE. */
|
||
int
|
||
input_file_buffer_size ()
|
||
{
|
||
return (BUFFER_SIZE);
|
||
}
|
||
|
||
int
|
||
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);
|
||
}
|
||
|
||
#ifdef DONTDEF /* JF save old version in case we need it */
|
||
void
|
||
input_file_open (filename, preprocess, debugging)
|
||
char *filename; /* "" means use stdin. Must not be 0. */
|
||
int preprocess; /* TRUE if needs app. */
|
||
int debugging; /* TRUE if we are debugging assembler. */
|
||
{
|
||
assert (filename != 0); /* Filename may not be NULL. */
|
||
if (filename[0])
|
||
{ /* We have a file name. Suck it and see. */
|
||
file_handle = open (filename, O_RDONLY, 0);
|
||
file_name = filename;
|
||
}
|
||
else
|
||
{ /* use stdin for the input file. */
|
||
file_handle = fileno (stdin);
|
||
file_name = "{standard input}"; /* For error messages. */
|
||
}
|
||
if (file_handle < 0)
|
||
as_perror ("Can't open %s for reading", file_name);
|
||
if (preprocess)
|
||
{
|
||
/*
|
||
* This code was written in haste for a frobbed BSD 4.2.
|
||
* I have a flight to catch: will someone please do proper
|
||
* error checks? - Dean.
|
||
*/
|
||
int pid;
|
||
char temporary_file_name[12];
|
||
int fd;
|
||
union wait status;
|
||
|
||
(void) strcpy (temporary_file_name, "#appXXXXXX");
|
||
(void) mktemp (temporary_file_name);
|
||
pid = vfork ();
|
||
if (pid == -1)
|
||
{
|
||
as_perror ("Vfork failed", file_name);
|
||
_exit (144);
|
||
}
|
||
if (pid == 0)
|
||
{
|
||
(void) dup2 (file_handle, fileno (stdin));
|
||
fd = open (temporary_file_name, O_WRONLY + O_TRUNC + O_CREAT, 0666);
|
||
if (fd == -1)
|
||
{
|
||
(void) write (2, "Can't open temporary\n", 21);
|
||
_exit (99);
|
||
}
|
||
(void) dup2 (fd, fileno (stdout));
|
||
/* JF for testing #define PREPROCESSOR "/lib/app" */
|
||
#define PREPROCESSOR "./app"
|
||
execl (PREPROCESSOR, PREPROCESSOR, 0);
|
||
execl ("app", "app", 0);
|
||
(void) write (2, "Exec of app failed. Get help.\n", 31);
|
||
(void) unlink (temporary_file_name);
|
||
_exit (11);
|
||
}
|
||
(void) wait (&status);
|
||
if (status.w_status & 0xFF00) /* JF was 0xF000, was wrong */
|
||
{
|
||
file_handle = -1;
|
||
as_bad ("Can't preprocess file \"%s\", status = %xx", file_name, status.w_status);
|
||
}
|
||
else
|
||
{
|
||
file_handle = open (temporary_file_name, O_RDONLY, 0);
|
||
if (!debugging && unlink (temporary_file_name))
|
||
as_perror ("Can't delete temp file %s", temporary_file_name);
|
||
}
|
||
if (file_handle == -1)
|
||
as_perror ("Can't retrieve temp file %s", temporary_file_name);
|
||
}
|
||
}
|
||
|
||
#else
|
||
|
||
void
|
||
input_file_open (filename, pre)
|
||
char *filename; /* "" means use stdin. Must not be 0. */
|
||
int pre;
|
||
{
|
||
int c;
|
||
char buf[80];
|
||
|
||
preprocess = pre;
|
||
|
||
assert (filename != 0); /* Filename may not be NULL. */
|
||
if (filename[0])
|
||
{ /* We have a file name. Suck it and see. */
|
||
f_in = fopen (filename, "r");
|
||
file_name = filename;
|
||
}
|
||
else
|
||
{ /* use stdin for the input file. */
|
||
f_in = stdin;
|
||
file_name = "{standard input}"; /* For error messages. */
|
||
}
|
||
if (f_in == (FILE *) 0)
|
||
{
|
||
as_perror ("Can't open %s for reading", file_name);
|
||
return;
|
||
}
|
||
|
||
#ifdef _IOFBF
|
||
/* Ask stdio to buffer our input at BUFFER_SIZE, with a dynamically
|
||
allocated buffer. */
|
||
setvbuf (f_in, (char *) NULL, _IOFBF, BUFFER_SIZE);
|
||
#endif /* VMS */
|
||
|
||
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);
|
||
|
||
#ifdef DONTDEF
|
||
if (preprocess)
|
||
{
|
||
char temporary_file_name[17];
|
||
FILE *f_out;
|
||
|
||
(void) strcpy (temporary_file_name, "/tmp/#appXXXXXX");
|
||
(void) mktemp (temporary_file_name);
|
||
f_out = fopen (temporary_file_name, "w+");
|
||
if (f_out == (FILE *) 0)
|
||
as_perror ("Can't open temp file %s", temporary_file_name);
|
||
|
||
/* JF this will have to be moved on any system that
|
||
does not support removal of open files. */
|
||
(void) unlink (temporary_file_name); /* JF do it NOW */
|
||
do_scrub (f_in, f_out);
|
||
(void) fclose (f_in); /* All done with it */
|
||
(void) rewind (f_out);
|
||
f_in = f_out;
|
||
}
|
||
#endif
|
||
}
|
||
|
||
#endif
|
||
|
||
/* Close input file. */
|
||
void
|
||
input_file_close ()
|
||
{
|
||
if (f_in != NULL)
|
||
{
|
||
fclose (f_in);
|
||
} /* don't close a null file pointer */
|
||
f_in = 0;
|
||
} /* input_file_close() */
|
||
|
||
char *
|
||
input_file_give_next_buffer (where)
|
||
char *where; /* Where to place 1st character of new buffer. */
|
||
{
|
||
char *return_value; /* -> Last char of what we read, + 1. */
|
||
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)
|
||
{
|
||
char *p;
|
||
int n;
|
||
int ch;
|
||
extern FILE *scrub_file;
|
||
|
||
scrub_file = f_in;
|
||
for (p = where, n = BUFFER_SIZE; n; --n)
|
||
{
|
||
|
||
ch = do_scrub_next_char (scrub_from_file, scrub_to_file);
|
||
if (ch == EOF)
|
||
break;
|
||
*p++ = ch;
|
||
}
|
||
size = BUFFER_SIZE - n;
|
||
}
|
||
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);
|
||
}
|
||
|
||
/* end of input-file.c */
|