mirror of
https://github.com/darlinghq/darling-gdb.git
synced 2024-12-05 02:47:05 +00:00
411863a44d
* as.c: Likewise. * ehopt.c: Likewise. * expr.c: Likewise. * input-file.c: Likewise. * listing.c: Likewise. * macro.h: Likewise. * stabs.c: Likewise. * symbols.c: Likewise.
254 lines
5.8 KiB
C
254 lines
5.8 KiB
C
/* input_file.c - Deal with Input Files -
|
||
Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1999, 2000, 2001
|
||
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, 59 Temple Place - Suite 330, Boston, MA
|
||
02111-1307, 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! */
|
||
|
||
#include <stdio.h>
|
||
#include <string.h>
|
||
#include "as.h"
|
||
#include "input-file.h"
|
||
#include "safe-ctype.h"
|
||
|
||
static int input_file_get PARAMS ((char *, int));
|
||
|
||
/* 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. */
|
||
|
||
static FILE *f_in;
|
||
static 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. */
|
||
unsigned 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 ();
|
||
|
||
/* Initialize for new file. */
|
||
input_file_begin ();
|
||
|
||
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);
|
||
}
|
||
|
||
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, FOPEN_RT);
|
||
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_bad (_("can't open %s for reading"), file_name);
|
||
as_perror ("%s", file_name);
|
||
return;
|
||
}
|
||
|
||
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 (!strncmp (buf, "O_APP", 5) && ISSPACE (buf[5]))
|
||
preprocess = 0;
|
||
if (!strchr (buf, '\n'))
|
||
ungetc ('#', f_in); /* It was longer. */
|
||
else
|
||
ungetc ('\n', f_in);
|
||
}
|
||
else if (c == 'A')
|
||
{
|
||
fgets (buf, 80, f_in);
|
||
if (!strncmp (buf, "PP", 2) && ISSPACE (buf[2]))
|
||
preprocess = 1;
|
||
if (!strchr (buf, '\n'))
|
||
ungetc ('#', f_in);
|
||
else
|
||
ungetc ('\n', f_in);
|
||
}
|
||
else if (c == '\n')
|
||
ungetc ('\n', f_in);
|
||
else
|
||
ungetc ('#', f_in);
|
||
}
|
||
else
|
||
ungetc (c, f_in);
|
||
}
|
||
|
||
/* Close input file. */
|
||
|
||
void
|
||
input_file_close ()
|
||
{
|
||
/* Don't close a null file pointer. */
|
||
if (f_in != NULL)
|
||
fclose (f_in);
|
||
|
||
f_in = 0;
|
||
}
|
||
|
||
/* This function is passed to do_scrub_chars. */
|
||
|
||
static int
|
||
input_file_get (buf, buflen)
|
||
char *buf;
|
||
int buflen;
|
||
{
|
||
int size;
|
||
|
||
size = fread (buf, sizeof (char), buflen, f_in);
|
||
if (size < 0)
|
||
{
|
||
as_perror (_("Can't read from %s"), file_name);
|
||
size = 0;
|
||
}
|
||
return size;
|
||
}
|
||
|
||
/* Read a buffer from the input file. */
|
||
|
||
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)
|
||
size = do_scrub_chars (input_file_get, where, BUFFER_SIZE);
|
||
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;
|
||
}
|