OpenBSD-4.6/gnu/usr.bin/gas/input-file.c
/* $OpenBSD: input-file.c,v 1.3 2001/07/09 07:04:35 deraadt Exp $ */
/* 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!
*/
#ifndef lint
static char rcsid[] = "$OpenBSD: input-file.c,v 1.3 2001/07/09 07:04:35 deraadt Exp $";
#endif
#ifdef USG
#define setbuffer(stream, buf, size) setvbuf((stream), (buf), _IOFBF, (size))
#endif
#include <stdio.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, (char *)NULL);
execl ("app","app",(char *)NULL);
(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;
}
#ifndef HO_VMS
/* Ask stdio to buffer our input at BUFFER_SIZE, with a dynamically
allocated buffer. */
setvbuf(f_in, (char *)NULL, _IOFBF, BUFFER_SIZE);
#endif /* HO_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 */