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- /* seq.c
- Get and increment the conversation sequence number for a system.
-
- Copyright (C) 1991, 1992, 1993 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-
- The author of the program may be contacted at ian@airs.com or
- c/o Cygnus Support, 48 Grove Street, Somerville, MA 02144.
- */
-
- #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;
- }
-