binutils-gdb/gas/input-file.c

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/* 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. */
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/*
* 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.
*/
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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;
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/* 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;
};
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/* These hooks accomodate most operating systems. */
void
input_file_begin ()
{
f_in = (FILE *) 0;
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}
void
input_file_end ()
{
}
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/* Return BUFFER_SIZE. */
int
input_file_buffer_size ()
{
return (BUFFER_SIZE);
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}
int
input_file_is_open ()
{
return f_in != (FILE *) 0;
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}
/* 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;
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}
void
input_file_pop (arg)
char *arg;
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{
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);
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}
#ifdef DONTDEF /* JF save old version in case we need it */
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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. */
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{
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);
}
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}
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#else
void
input_file_open (filename, pre)
char *filename; /* "" means use stdin. Must not be 0. */
int pre;
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{
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
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allocated buffer. */
setvbuf (f_in, (char *) NULL, _IOFBF, BUFFER_SIZE);
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#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);
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#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;
}
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#endif
}
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#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() */
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char *
input_file_give_next_buffer (where)
char *where; /* Where to place 1st character of new buffer. */
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{
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);
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}
/* end of input-file.c */