127 lines
3.0 KiB
C
127 lines
3.0 KiB
C
/* seq.c
|
||
Get and increment the conversation sequence number for a system.
|
||
|
||
Copyright (C) 1991, 1992 Ian Lance Taylor
|
||
|
||
This file is part of the Taylor UUCP package.
|
||
|
||
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 2 of the
|
||
License, 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.
|
||
|
||
The author of the program may be contacted at ian@airs.com or
|
||
c/o Infinity Development Systems, P.O. Box 520, Waltham, MA 02254.
|
||
*/
|
||
|
||
#include "uucp.h"
|
||
|
||
#include "uudefs.h"
|
||
#include "uuconf.h"
|
||
#include "sysdep.h"
|
||
#include "system.h"
|
||
|
||
#include <errno.h>
|
||
|
||
/* Get the current conversation sequence number for a remote system,
|
||
and increment it for next time. The conversation sequence number
|
||
is kept in a file named for the system in the directory .Sequence
|
||
in the spool directory. This is not compatible with other versions
|
||
of UUCP, but it makes more sense to me. The sequence file is only
|
||
used if specified in the information for that system. */
|
||
|
||
long
|
||
ixsysdep_get_sequence (qsys)
|
||
const struct uuconf_system *qsys;
|
||
{
|
||
FILE *e;
|
||
char *zname;
|
||
struct stat s;
|
||
long iseq;
|
||
|
||
/* This will only be called when the system is locked anyhow, so there
|
||
is no need to use a separate lock for the conversation sequence
|
||
file. */
|
||
zname = zsysdep_in_dir (".Sequence", qsys->uuconf_zname);
|
||
|
||
iseq = 0;
|
||
if (stat (zname, &s) == 0)
|
||
{
|
||
boolean fok;
|
||
char *zline;
|
||
size_t cline;
|
||
|
||
/* The file should only be readable and writable by uucp. */
|
||
if ((s.st_mode & (S_IRWXG | S_IRWXO)) != 0)
|
||
{
|
||
ulog (LOG_ERROR,
|
||
"Bad file protection for conversation sequence file");
|
||
ubuffree (zname);
|
||
return -1;
|
||
}
|
||
|
||
e = fopen (zname, "r+");
|
||
if (e == NULL)
|
||
{
|
||
ulog (LOG_ERROR, "fopen (%s): %s", zname, strerror (errno));
|
||
ubuffree (zname);
|
||
return -1;
|
||
}
|
||
|
||
ubuffree (zname);
|
||
|
||
fok = TRUE;
|
||
zline = NULL;
|
||
cline = 0;
|
||
if (getline (&zline, &cline, e) <= 0)
|
||
fok = FALSE;
|
||
else
|
||
{
|
||
char *zend;
|
||
|
||
iseq = strtol (zline, &zend, 10);
|
||
if (zend == zline)
|
||
fok = FALSE;
|
||
}
|
||
|
||
xfree ((pointer) zline);
|
||
|
||
if (! fok)
|
||
{
|
||
ulog (LOG_ERROR, "Bad format for conversation sequence file");
|
||
(void) fclose (e);
|
||
return -1;
|
||
}
|
||
|
||
rewind (e);
|
||
}
|
||
else
|
||
{
|
||
e = esysdep_fopen (zname, FALSE, FALSE, TRUE);
|
||
ubuffree (zname);
|
||
if (e == NULL)
|
||
return -1;
|
||
}
|
||
|
||
++iseq;
|
||
|
||
fprintf (e, "%ld", iseq);
|
||
|
||
if (fclose (e) != 0)
|
||
{
|
||
ulog (LOG_ERROR, "fclose: %s", strerror (errno));
|
||
return -1;
|
||
}
|
||
|
||
return iseq;
|
||
}
|