328 lines
8.4 KiB
C
328 lines
8.4 KiB
C
/* input_file.c - Deal with Input Files -
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Copyright (C) 1987, 1990, 1991, 1992 Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GAS; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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/*
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* Confines all details of reading source bytes to this module.
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* All O/S specific crocks should live here.
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* What we lose in "efficiency" we gain in modularity.
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* Note we don't need to #include the "as.h" file. No common coupling!
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*/
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#ifndef lint
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static char rcsid[] = "$Id: input-file.c,v 1.3 1993/10/02 20:57:37 pk Exp $";
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#endif
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#ifdef USG
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#define setbuffer(stream, buf, size) setvbuf((stream), (buf), _IOFBF, (size))
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#endif
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#include <stdio.h>
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#include <string.h>
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#include "as.h"
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#include "input-file.h"
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/* This variable is non-zero if the file currently being read should be
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preprocessed by app. It is zero if the file can be read straight in.
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*/
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int preprocess = 0;
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/*
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* This code opens a file, then delivers BUFFER_SIZE character
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* chunks of the file on demand.
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* BUFFER_SIZE is supposed to be a number chosen for speed.
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* The caller only asks once what BUFFER_SIZE is, and asks before
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* the nature of the input files (if any) is known.
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*/
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#define BUFFER_SIZE (32 * 1024)
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/*
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* We use static data: the data area is not sharable.
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*/
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FILE *f_in;
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/* static JF remove static so app.c can use file_name */
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char * file_name;
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/* Struct for saving the state of this module for file includes. */
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struct saved_file {
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FILE *f_in;
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char *file_name;
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int preprocess;
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char *app_save;
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};
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/* These hooks accomodate most operating systems. */
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void input_file_begin() {
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f_in = (FILE *)0;
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}
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void input_file_end () { }
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/* Return BUFFER_SIZE. */
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int input_file_buffer_size() {
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return (BUFFER_SIZE);
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}
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int input_file_is_open() {
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return f_in != (FILE *)0;
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}
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/* Push the state of our input, returning a pointer to saved info that
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can be restored with input_file_pop (). */
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char *input_file_push () {
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register struct saved_file *saved;
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saved = (struct saved_file *)xmalloc (sizeof *saved);
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saved->f_in = f_in;
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saved->file_name = file_name;
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saved->preprocess = preprocess;
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if (preprocess)
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saved->app_save = app_push ();
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input_file_begin (); /* Initialize for new file */
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return (char *)saved;
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}
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void
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input_file_pop (arg)
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char *arg;
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{
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register struct saved_file *saved = (struct saved_file *)arg;
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input_file_end (); /* Close out old file */
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f_in = saved->f_in;
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file_name = saved->file_name;
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preprocess = saved->preprocess;
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if (preprocess)
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app_pop (saved->app_save);
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free(arg);
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}
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#ifdef DONTDEF /* JF save old version in case we need it */
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void
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input_file_open (filename, preprocess, debugging)
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char * filename; /* "" means use stdin. Must not be 0. */
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int preprocess; /* TRUE if needs app. */
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int debugging; /* TRUE if we are debugging assembler. */
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{
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assert( filename != 0 ); /* Filename may not be NULL. */
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if (filename[0])
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{ /* We have a file name. Suck it and see. */
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file_handle = open (filename, O_RDONLY, 0);
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file_name = filename;
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}
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else
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{ /* use stdin for the input file. */
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file_handle = fileno (stdin);
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file_name = "{standard input}"; /* For error messages. */
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}
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if (file_handle < 0)
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as_perror ("Can't open %s for reading", file_name);
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if ( preprocess )
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{
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/*
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* This code was written in haste for a frobbed BSD 4.2.
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* I have a flight to catch: will someone please do proper
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* error checks? - Dean.
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*/
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int pid;
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char temporary_file_name[12];
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int fd;
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union wait status;
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(void)strcpy (temporary_file_name, "#appXXXXXX");
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(void)mktemp (temporary_file_name);
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pid = vfork ();
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if (pid == -1)
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{
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as_perror ("Vfork failed", file_name);
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_exit (144);
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}
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if (pid == 0)
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{
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(void)dup2 (file_handle, fileno(stdin));
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fd = open (temporary_file_name, O_WRONLY + O_TRUNC + O_CREAT, 0666);
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if (fd == -1)
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{
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(void)write(2,"Can't open temporary\n",21);
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_exit (99);
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}
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(void)dup2 (fd, fileno(stdout));
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/* JF for testing #define PREPROCESSOR "/lib/app" */
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#define PREPROCESSOR "./app"
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execl (PREPROCESSOR, PREPROCESSOR, 0);
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execl ("app","app",0);
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(void)write(2,"Exec of app failed. Get help.\n",31);
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(void)unlink(temporary_file_name);
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_exit (11);
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}
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(void)wait (& status);
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if (status.w_status & 0xFF00) /* JF was 0xF000, was wrong */
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{
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file_handle = -1;
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as_bad( "Can't preprocess file \"%s\", status = %xx", file_name, status.w_status );
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}
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else
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{
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file_handle = open (temporary_file_name, O_RDONLY, 0);
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if ( ! debugging && unlink(temporary_file_name))
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as_perror ("Can't delete temp file %s", temporary_file_name);
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}
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if (file_handle == -1)
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as_perror ("Can't retrieve temp file %s", temporary_file_name);
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}
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}
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#else
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void
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input_file_open (filename,pre)
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char * filename; /* "" means use stdin. Must not be 0. */
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int pre;
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{
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int c;
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char buf[80];
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preprocess = pre;
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assert( filename != 0 ); /* Filename may not be NULL. */
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if (filename[0]) { /* We have a file name. Suck it and see. */
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f_in=fopen(filename,"r");
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file_name=filename;
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} else { /* use stdin for the input file. */
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f_in = stdin;
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file_name = "{standard input}"; /* For error messages. */
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}
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if (f_in == (FILE *)0) {
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as_perror ("Can't open %s for reading", file_name);
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return;
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}
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#ifndef HO_VMS
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/* Ask stdio to buffer our input at BUFFER_SIZE, with a dynamically
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allocated buffer. */
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setvbuf(f_in, (char *)NULL, _IOFBF, BUFFER_SIZE);
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#endif /* HO_VMS */
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c = getc(f_in);
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if (c == '#') { /* Begins with comment, may not want to preprocess */
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c = getc(f_in);
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if (c == 'N') {
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fgets(buf,80,f_in);
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if (!strcmp(buf,"O_APP\n"))
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preprocess=0;
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if (!strchr(buf,'\n'))
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ungetc('#',f_in); /* It was longer */
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else
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ungetc('\n',f_in);
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} else if (c == '\n')
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ungetc('\n',f_in);
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else
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ungetc('#',f_in);
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} else
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ungetc(c,f_in);
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#ifdef DONTDEF
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if ( preprocess ) {
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char temporary_file_name[17];
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FILE *f_out;
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(void)strcpy (temporary_file_name, "/tmp/#appXXXXXX");
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(void)mktemp (temporary_file_name);
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f_out=fopen(temporary_file_name,"w+");
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if (f_out == (FILE *)0)
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as_perror("Can't open temp file %s",temporary_file_name);
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/* JF this will have to be moved on any system that
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does not support removal of open files. */
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(void)unlink(temporary_file_name);/* JF do it NOW */
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do_scrub(f_in,f_out);
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(void)fclose(f_in); /* All done with it */
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(void)rewind(f_out);
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f_in=f_out;
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}
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#endif
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}
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#endif
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/* Close input file. */
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void input_file_close() {
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if (f_in != NULL) {
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fclose (f_in);
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} /* don't close a null file pointer */
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f_in = 0;
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} /* input_file_close() */
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char *
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input_file_give_next_buffer (where)
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char * where; /* Where to place 1st character of new buffer. */
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{
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char * return_value; /* -> Last char of what we read, + 1. */
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register int size;
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if (f_in == (FILE *)0)
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return 0;
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/*
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* fflush (stdin); could be done here if you want to synchronise
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* stdin and stdout, for the case where our input file is stdin.
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* Since the assembler shouldn't do any output to stdout, we
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* don't bother to synch output and input.
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*/
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if (preprocess) {
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char *p;
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int n;
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int ch;
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extern FILE *scrub_file;
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scrub_file=f_in;
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for (p = where, n = BUFFER_SIZE; n; --n) {
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ch = do_scrub_next_char(scrub_from_file, scrub_to_file);
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if (ch == EOF)
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break;
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*p++=ch;
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}
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size=BUFFER_SIZE-n;
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} else
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size= fread(where,sizeof(char),BUFFER_SIZE,f_in);
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if (size < 0)
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{
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as_perror ("Can't read from %s", file_name);
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size = 0;
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}
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if (size)
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return_value = where + size;
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else
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{
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if (fclose (f_in))
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as_perror ("Can't close %s", file_name);
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f_in = (FILE *)0;
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return_value = 0;
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}
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return (return_value);
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}
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/* end of input-file.c */
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