127 lines
3.0 KiB
C
127 lines
3.0 KiB
C
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/* seq.c
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Get and increment the conversation sequence number for a system.
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Copyright (C) 1991, 1992 Ian Lance Taylor
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This file is part of the Taylor UUCP package.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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The author of the program may be contacted at ian@airs.com or
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c/o Infinity Development Systems, P.O. Box 520, Waltham, MA 02254.
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*/
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#include "uucp.h"
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#include "uudefs.h"
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#include "uuconf.h"
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#include "sysdep.h"
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#include "system.h"
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#include <errno.h>
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/* Get the current conversation sequence number for a remote system,
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and increment it for next time. The conversation sequence number
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is kept in a file named for the system in the directory .Sequence
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in the spool directory. This is not compatible with other versions
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of UUCP, but it makes more sense to me. The sequence file is only
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used if specified in the information for that system. */
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long
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ixsysdep_get_sequence (qsys)
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const struct uuconf_system *qsys;
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{
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FILE *e;
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char *zname;
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struct stat s;
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long iseq;
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/* This will only be called when the system is locked anyhow, so there
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is no need to use a separate lock for the conversation sequence
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file. */
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zname = zsysdep_in_dir (".Sequence", qsys->uuconf_zname);
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iseq = 0;
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if (stat (zname, &s) == 0)
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{
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boolean fok;
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char *zline;
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size_t cline;
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/* The file should only be readable and writable by uucp. */
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if ((s.st_mode & (S_IRWXG | S_IRWXO)) != 0)
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{
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ulog (LOG_ERROR,
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"Bad file protection for conversation sequence file");
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ubuffree (zname);
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return -1;
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}
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e = fopen (zname, "r+");
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if (e == NULL)
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{
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ulog (LOG_ERROR, "fopen (%s): %s", zname, strerror (errno));
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ubuffree (zname);
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return -1;
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}
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ubuffree (zname);
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fok = TRUE;
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zline = NULL;
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cline = 0;
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if (getline (&zline, &cline, e) <= 0)
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fok = FALSE;
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else
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{
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char *zend;
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iseq = strtol (zline, &zend, 10);
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if (zend == zline)
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fok = FALSE;
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}
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xfree ((pointer) zline);
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if (! fok)
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{
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ulog (LOG_ERROR, "Bad format for conversation sequence file");
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(void) fclose (e);
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return -1;
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}
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rewind (e);
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}
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else
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{
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e = esysdep_fopen (zname, FALSE, FALSE, TRUE);
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ubuffree (zname);
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if (e == NULL)
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return -1;
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}
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++iseq;
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fprintf (e, "%ld", iseq);
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if (fclose (e) != 0)
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{
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ulog (LOG_ERROR, "fclose: %s", strerror (errno));
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return -1;
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}
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return iseq;
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}
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