/* input_file.c - Deal with Input Files -
|
/* input_file.c - Deal with Input Files -
|
Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1999, 2000, 2001,
|
Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1999, 2000, 2001,
|
2002, 2003, 2005, 2006, 2007
|
2002, 2003, 2005, 2006, 2007
|
Free Software Foundation, Inc.
|
Free Software Foundation, Inc.
|
|
|
This file is part of GAS, the GNU Assembler.
|
This file is part of GAS, the GNU Assembler.
|
|
|
GAS is free software; you can redistribute it and/or modify
|
GAS is free software; you can redistribute it and/or modify
|
it under the terms of the GNU General Public License as published by
|
it under the terms of the GNU General Public License as published by
|
the Free Software Foundation; either version 3, or (at your option)
|
the Free Software Foundation; either version 3, or (at your option)
|
any later version.
|
any later version.
|
|
|
GAS is distributed in the hope that it will be useful,
|
GAS is distributed in the hope that it will be useful,
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
GNU General Public License for more details.
|
GNU General Public License for more details.
|
|
|
You should have received a copy of the GNU General Public License
|
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
|
along with GAS; see the file COPYING. If not, write to the Free
|
Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
|
Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
|
02110-1301, USA. */
|
02110-1301, USA. */
|
|
|
/* Confines all details of reading source bytes to this module.
|
/* Confines all details of reading source bytes to this module.
|
All O/S specific crocks should live here.
|
All O/S specific crocks should live here.
|
What we lose in "efficiency" we gain in modularity.
|
What we lose in "efficiency" we gain in modularity.
|
Note we don't need to #include the "as.h" file. No common coupling! */
|
Note we don't need to #include the "as.h" file. No common coupling! */
|
|
|
#include "as.h"
|
#include "as.h"
|
#include "input-file.h"
|
#include "input-file.h"
|
#include "safe-ctype.h"
|
#include "safe-ctype.h"
|
|
|
static int input_file_get (char *, int);
|
static int input_file_get (char *, int);
|
|
|
/* This variable is non-zero if the file currently being read should be
|
/* 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. */
|
preprocessed by app. It is zero if the file can be read straight in. */
|
int preprocess = 0;
|
int preprocess = 0;
|
|
|
/* This code opens a file, then delivers BUFFER_SIZE character
|
/* This code opens a file, then delivers BUFFER_SIZE character
|
chunks of the file on demand.
|
chunks of the file on demand.
|
BUFFER_SIZE is supposed to be a number chosen for speed.
|
BUFFER_SIZE is supposed to be a number chosen for speed.
|
The caller only asks once what BUFFER_SIZE is, and asks before
|
The caller only asks once what BUFFER_SIZE is, and asks before
|
the nature of the input files (if any) is known. */
|
the nature of the input files (if any) is known. */
|
|
|
#define BUFFER_SIZE (32 * 1024)
|
#define BUFFER_SIZE (32 * 1024)
|
|
|
/* We use static data: the data area is not sharable. */
|
/* We use static data: the data area is not sharable. */
|
|
|
static FILE *f_in;
|
static FILE *f_in;
|
static char *file_name;
|
static char *file_name;
|
|
|
/* Struct for saving the state of this module for file includes. */
|
/* Struct for saving the state of this module for file includes. */
|
struct saved_file
|
struct saved_file
|
{
|
{
|
FILE * f_in;
|
FILE * f_in;
|
char * file_name;
|
char * file_name;
|
int preprocess;
|
int preprocess;
|
char * app_save;
|
char * app_save;
|
};
|
};
|
|
|
/* These hooks accommodate most operating systems. */
|
/* These hooks accommodate most operating systems. */
|
|
|
void
|
void
|
input_file_begin (void)
|
input_file_begin (void)
|
{
|
{
|
f_in = (FILE *) 0;
|
f_in = (FILE *) 0;
|
}
|
}
|
|
|
void
|
void
|
input_file_end (void)
|
input_file_end (void)
|
{
|
{
|
}
|
}
|
|
|
/* Return BUFFER_SIZE. */
|
/* Return BUFFER_SIZE. */
|
unsigned int
|
unsigned int
|
input_file_buffer_size (void)
|
input_file_buffer_size (void)
|
{
|
{
|
return (BUFFER_SIZE);
|
return (BUFFER_SIZE);
|
}
|
}
|
|
|
/* Push the state of our input, returning a pointer to saved info that
|
/* Push the state of our input, returning a pointer to saved info that
|
can be restored with input_file_pop (). */
|
can be restored with input_file_pop (). */
|
|
|
char *
|
char *
|
input_file_push (void)
|
input_file_push (void)
|
{
|
{
|
register struct saved_file *saved;
|
register struct saved_file *saved;
|
|
|
saved = (struct saved_file *) xmalloc (sizeof *saved);
|
saved = (struct saved_file *) xmalloc (sizeof *saved);
|
|
|
saved->f_in = f_in;
|
saved->f_in = f_in;
|
saved->file_name = file_name;
|
saved->file_name = file_name;
|
saved->preprocess = preprocess;
|
saved->preprocess = preprocess;
|
if (preprocess)
|
if (preprocess)
|
saved->app_save = app_push ();
|
saved->app_save = app_push ();
|
|
|
/* Initialize for new file. */
|
/* Initialize for new file. */
|
input_file_begin ();
|
input_file_begin ();
|
|
|
return (char *) saved;
|
return (char *) saved;
|
}
|
}
|
|
|
void
|
void
|
input_file_pop (char *arg)
|
input_file_pop (char *arg)
|
{
|
{
|
register struct saved_file *saved = (struct saved_file *) arg;
|
register struct saved_file *saved = (struct saved_file *) arg;
|
|
|
input_file_end (); /* Close out old file. */
|
input_file_end (); /* Close out old file. */
|
|
|
f_in = saved->f_in;
|
f_in = saved->f_in;
|
file_name = saved->file_name;
|
file_name = saved->file_name;
|
preprocess = saved->preprocess;
|
preprocess = saved->preprocess;
|
if (preprocess)
|
if (preprocess)
|
app_pop (saved->app_save);
|
app_pop (saved->app_save);
|
|
|
free (arg);
|
free (arg);
|
}
|
}
|
|
|
void
|
void
|
input_file_open (char *filename, /* "" means use stdin. Must not be 0. */
|
input_file_open (char *filename, /* "" means use stdin. Must not be 0. */
|
int pre)
|
int pre)
|
{
|
{
|
int c;
|
int c;
|
char buf[80];
|
char buf[80];
|
|
|
preprocess = pre;
|
preprocess = pre;
|
|
|
assert (filename != 0); /* Filename may not be NULL. */
|
assert (filename != 0); /* Filename may not be NULL. */
|
if (filename[0])
|
if (filename[0])
|
{
|
{
|
f_in = fopen (filename, FOPEN_RT);
|
f_in = fopen (filename, FOPEN_RT);
|
file_name = filename;
|
file_name = filename;
|
}
|
}
|
else
|
else
|
{
|
{
|
/* Use stdin for the input file. */
|
/* Use stdin for the input file. */
|
f_in = stdin;
|
f_in = stdin;
|
/* For error messages. */
|
/* For error messages. */
|
file_name = _("{standard input}");
|
file_name = _("{standard input}");
|
}
|
}
|
|
|
if (f_in == NULL)
|
if (f_in == NULL)
|
{
|
{
|
as_bad (_("can't open %s for reading: %s"),
|
as_bad (_("can't open %s for reading: %s"),
|
file_name, xstrerror (errno));
|
file_name, xstrerror (errno));
|
return;
|
return;
|
}
|
}
|
|
|
c = getc (f_in);
|
c = getc (f_in);
|
|
|
if (ferror (f_in))
|
if (ferror (f_in))
|
{
|
{
|
as_bad (_("can't read from %s: %s"),
|
as_bad (_("can't read from %s: %s"),
|
file_name, xstrerror (errno));
|
file_name, xstrerror (errno));
|
|
|
fclose (f_in);
|
fclose (f_in);
|
f_in = NULL;
|
f_in = NULL;
|
return;
|
return;
|
}
|
}
|
|
|
if (c == '#')
|
if (c == '#')
|
{
|
{
|
/* Begins with comment, may not want to preprocess. */
|
/* Begins with comment, may not want to preprocess. */
|
c = getc (f_in);
|
c = getc (f_in);
|
if (c == 'N')
|
if (c == 'N')
|
{
|
{
|
if (fgets (buf, sizeof (buf), f_in)
|
if (fgets (buf, sizeof (buf), f_in)
|
&& !strncmp (buf, "O_APP", 5) && ISSPACE (buf[5]))
|
&& !strncmp (buf, "O_APP", 5) && ISSPACE (buf[5]))
|
preprocess = 0;
|
preprocess = 0;
|
if (!strchr (buf, '\n'))
|
if (!strchr (buf, '\n'))
|
ungetc ('#', f_in); /* It was longer. */
|
ungetc ('#', f_in); /* It was longer. */
|
else
|
else
|
ungetc ('\n', f_in);
|
ungetc ('\n', f_in);
|
}
|
}
|
else if (c == 'A')
|
else if (c == 'A')
|
{
|
{
|
if (fgets (buf, sizeof (buf), f_in)
|
if (fgets (buf, sizeof (buf), f_in)
|
&& !strncmp (buf, "PP", 2) && ISSPACE (buf[2]))
|
&& !strncmp (buf, "PP", 2) && ISSPACE (buf[2]))
|
preprocess = 1;
|
preprocess = 1;
|
if (!strchr (buf, '\n'))
|
if (!strchr (buf, '\n'))
|
ungetc ('#', f_in);
|
ungetc ('#', f_in);
|
else
|
else
|
ungetc ('\n', f_in);
|
ungetc ('\n', f_in);
|
}
|
}
|
else if (c == '\n')
|
else if (c == '\n')
|
ungetc ('\n', f_in);
|
ungetc ('\n', f_in);
|
else
|
else
|
ungetc ('#', f_in);
|
ungetc ('#', f_in);
|
}
|
}
|
else
|
else
|
ungetc (c, f_in);
|
ungetc (c, f_in);
|
}
|
}
|
|
|
/* Close input file. */
|
/* Close input file. */
|
|
|
void
|
void
|
input_file_close (void)
|
input_file_close (void)
|
{
|
{
|
/* Don't close a null file pointer. */
|
/* Don't close a null file pointer. */
|
if (f_in != NULL)
|
if (f_in != NULL)
|
fclose (f_in);
|
fclose (f_in);
|
|
|
f_in = 0;
|
f_in = 0;
|
}
|
}
|
|
|
/* This function is passed to do_scrub_chars. */
|
/* This function is passed to do_scrub_chars. */
|
|
|
static int
|
static int
|
input_file_get (char *buf, int buflen)
|
input_file_get (char *buf, int buflen)
|
{
|
{
|
int size;
|
int size;
|
|
|
size = fread (buf, sizeof (char), buflen, f_in);
|
size = fread (buf, sizeof (char), buflen, f_in);
|
if (size < 0)
|
if (size < 0)
|
{
|
{
|
as_bad (_("can't read from %s: %s"), file_name, xstrerror (errno));
|
as_bad (_("can't read from %s: %s"), file_name, xstrerror (errno));
|
size = 0;
|
size = 0;
|
}
|
}
|
return size;
|
return size;
|
}
|
}
|
|
|
/* Read a buffer from the input file. */
|
/* Read a buffer from the input file. */
|
|
|
char *
|
char *
|
input_file_give_next_buffer (char *where /* Where to place 1st character of new buffer. */)
|
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. */
|
char *return_value; /* -> Last char of what we read, + 1. */
|
register int size;
|
register int size;
|
|
|
if (f_in == (FILE *) 0)
|
if (f_in == (FILE *) 0)
|
return 0;
|
return 0;
|
/* fflush (stdin); could be done here if you want to synchronise
|
/* fflush (stdin); could be done here if you want to synchronise
|
stdin and stdout, for the case where our input file is stdin.
|
stdin and stdout, for the case where our input file is stdin.
|
Since the assembler shouldn't do any output to stdout, we
|
Since the assembler shouldn't do any output to stdout, we
|
don't bother to synch output and input. */
|
don't bother to synch output and input. */
|
if (preprocess)
|
if (preprocess)
|
size = do_scrub_chars (input_file_get, where, BUFFER_SIZE);
|
size = do_scrub_chars (input_file_get, where, BUFFER_SIZE);
|
else
|
else
|
size = fread (where, sizeof (char), BUFFER_SIZE, f_in);
|
size = fread (where, sizeof (char), BUFFER_SIZE, f_in);
|
if (size < 0)
|
if (size < 0)
|
{
|
{
|
as_bad (_("can't read from %s: %s"), file_name, xstrerror (errno));
|
as_bad (_("can't read from %s: %s"), file_name, xstrerror (errno));
|
size = 0;
|
size = 0;
|
}
|
}
|
if (size)
|
if (size)
|
return_value = where + size;
|
return_value = where + size;
|
else
|
else
|
{
|
{
|
if (fclose (f_in))
|
if (fclose (f_in))
|
as_warn (_("can't close %s: %s"), file_name, xstrerror (errno));
|
as_warn (_("can't close %s: %s"), file_name, xstrerror (errno));
|
|
|
f_in = (FILE *) 0;
|
f_in = (FILE *) 0;
|
return_value = 0;
|
return_value = 0;
|
}
|
}
|
|
|
return return_value;
|
return return_value;
|
}
|
}
|
|
|
