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/* Change Attributes program for GNU.
Copyright (C) 1988 Free Software Foundation, Inc.
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <a.out.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/file.h>
#include "ioutil.h"
#define forward extern
enum boolean { false, true };
typedef enum boolean boolean;
boolean change_to_shared_p;
boolean change_to_demand_loaded_p;
boolean silent_p;
int failures;
char *input_filename;
char output_filename [20];
int output_descriptor;
void
main (argc, argv)
int argc;
char *argv[];
{
register int argi;
register char **argp;
forward void usage ();
forward void process_file ();
forward void file_abort_handler ();
extern char *mktemp ();
iou_set_program_name (argv);
argi = 1;
argp = (& (argv [1]));
change_to_shared_p = false;
change_to_demand_loaded_p = false;
silent_p = false;
while ((argi < argc) && (((*argp) [0]) == '-'))
{
switch ((*argp) [1])
{
case 'n':
change_to_shared_p = true;
break;
case 'q':
change_to_demand_loaded_p = true;
break;
case 's':
silent_p = true;
break;
default:
usage ();
}
if (((*argp) [2]) != '\0')
usage ();
argi += 1;
argp += 1;
}
if (change_to_shared_p && change_to_demand_loaded_p)
iou_error ("conflicting options: -n and -q");
if ((! change_to_shared_p) && (! change_to_demand_loaded_p) && silent_p)
exit (0);
if (argi == argc)
exit (255);
strcpy (output_filename, "/tmp/chatrXXXXXX");
if (output_filename != (mktemp (output_filename)))
iou_error ("mktemp failure");
failures = 0;
for (; (argi < argc); argi += 1)
{
input_filename = (*argp++);
output_descriptor =
(iou_open (output_filename, (O_RDWR | O_CREAT | O_TRUNC), 0666));
iou_abort_handler_bind (process_file, file_abort_handler);
iou_close (output_descriptor);
}
iou_unlink (output_filename);
exit (failures);
}
void
usage ()
{
fprintf (stderr, "usage: %s [-n] [-q] [-s] file ...\n", iou_program_name);
iou_error ();
}
void
file_abort_handler ()
{
failures += 1;
return;
}
void
file_error (message)
char *message;
{
char buffer [256];
sprintf (buffer, "%s: \"%s\"", message, input_filename);
iou_error (buffer);
}
void
file_copy (input_descriptor, output_descriptor)
int input_descriptor;
int output_descriptor;
{
char buffer [8192];
register int bytes_read;
while (1)
{
bytes_read = (iou_read (input_descriptor, buffer, 8192));
if (bytes_read == 0) break;
iou_write (output_descriptor, buffer, bytes_read);
}
return;
}
void
process_file ()
{
int input_descriptor;
struct exec input_exec;
struct exec output_exec;
input_descriptor = (iou_open (input_filename, O_RDONLY));
if ((iou_read (input_descriptor, (& input_exec), (sizeof (input_exec)))) !=
(sizeof (input_exec)))
file_error ("unable to read file header");
switch (N_MAGIC (input_exec))
{
case NMAGIC:
if (change_to_shared_p)
file_error ("file not demand load executable");
break;
case ZMAGIC:
if (change_to_demand_loaded_p)
file_error ("file not shared executable");
break;
default:
file_error ("file not executable format");
}
if (! silent_p)
{
printf ("%s:\n", input_filename);
if (change_to_shared_p || change_to_demand_loaded_p)
printf (" current values:\n");
printf
(" %s executable\n",
(((N_MAGIC (input_exec)) == NMAGIC) ? "shared" : "demand loaded"));
fflush (stdout);
}
if ((! change_to_shared_p) && (! change_to_demand_loaded_p))
return;
output_exec = input_exec;
N_SET_MAGIC (output_exec, (change_to_shared_p ? NMAGIC : ZMAGIC));
iou_write (output_descriptor, (& output_exec), (sizeof (output_exec)));
iou_lseek (input_descriptor, (N_TXTOFF (input_exec)), 0);
iou_lseek (output_descriptor, (N_TXTOFF (output_exec)), 0);
file_copy (input_descriptor, output_descriptor);
/* Now copy the temporary output file back into the input file. */
iou_close (input_descriptor);
iou_lseek (output_descriptor, 0, 0);
input_descriptor = (iou_open (input_filename, (O_WRONLY | O_TRUNC), 0777));
file_copy (output_descriptor, input_descriptor);
iou_close (input_descriptor);
if (! silent_p)
{
printf (" new values:\n");
printf
(" %s executable\n",
(((N_MAGIC (output_exec)) == NMAGIC) ? "shared" : "demand loaded"));
fflush (stdout);
}
return;
}
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