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/* input_file.c - Deal with Input Files -
Copyright (C) 1987 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 1, 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!
*/
#define NDEBUG /* JF remove asserts */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <libc.h>
#include "input-file.h"
#include "xmalloc.h"
#include "input-scrub.h"
#include "app.h"
#include "as.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.
*/
#ifndef SUSPECT
static
#endif
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)
#ifndef NeXT
static char in_buf[BUFFER_SIZE];
#endif /* !defined(NeXT) */
/*
* We use static data: the data area is not sharable.
*/
FILE *f_in = NULL; /* JF do things the RIGHT way */
/* static JF remove static so app.c can use file_name */
char *file_name = NULL;
/* These hooks accomodate most operating systems. */
void
input_file_begin(
void)
{
/* file_handle = -1; */
f_in = (FILE *)0;
}
void
input_file_end(
void)
{
}
int /* Return BUFFER_SIZE. */
input_file_buffer_size(
void)
{
return (BUFFER_SIZE);
}
int
input_file_is_open(
void)
{
/* return (file_handle >= 0); */
return f_in!=(FILE *)0;
}
void
input_file_open(
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 source file for input", file_name);
return;
}
#ifdef NeXT /* .include feature */
setbuffer(f_in, xmalloc(BUFFER_SIZE), BUFFER_SIZE);
#else
setbuffer(f_in,in_buf,BUFFER_SIZE);
#endif
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(!index(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);
}
char *
input_file_give_next_buffer(
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.
*/
/* size = read (file_handle, where, BUFFER_SIZE); */
if(preprocess) {
char *p;
int n;
int ch;
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 source file: end-of-file faked.", file_name);
size = 0;
}
if (size)
return_value = where + size;
else
{
#ifdef NeXT /* .include feature */
if(doing_include)
free (f_in->_base);
#endif /* NeXT .include feature */
if (fclose (f_in))
as_perror ("Can't close source file -- continuing", file_name);
f_in = (FILE *)0;
return_value = 0;
}
return (return_value);
}
/* end: input_file.c */
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.