/*
* Empire - A multi-player, client/server Internet based war game.
- * Copyright (C) 1986-2000, Dave Pare, Jeff Bailey, Thomas Ruschak,
- * Ken Stevens, Steve McClure
+ * Copyright (C) 1986-2012, Dave Pare, Jeff Bailey, Thomas Ruschak,
+ * Ken Stevens, Steve McClure, Markus Armbruster
*
- * This program is free software; you can redistribute it and/or modify
+ * Empire 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
+ * the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* 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
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* ---
*
- * See the "LEGAL", "LICENSE", "CREDITS" and "README" files for all the
- * related information and legal notices. It is expected that any future
- * projects/authors will amend these files as needed.
+ * See files README, COPYING and CREDITS in the root of the source
+ * tree for related information and legal notices. It is expected
+ * that future projects/authors will amend these files as needed.
*
* ---
*
- * mailbox.c: Return string containing telegram file
- *
+ * mailbox.c: Mailbox file access
+ *
* Known contributors to this file:
- *
+ * Markus Armbruster, 2009-2011
*/
-#include "misc.h"
-#include "tel.h"
+#include <config.h>
+
#include <stdio.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include "optlist.h"
+#include "tel.h"
+#include "prototypes.h"
+
+char *
+mailbox(char *buf, natid cn)
+{
+ sprintf(buf, "%s/tel%d", teldir, cn);
+ return buf;
+}
+
+/*
+ * Create an empty telegram file named MBOX.
+ * Return 0 on success, -1 on failure.
+ */
+int
+mailbox_create(char *mbox)
+{
+ int fd;
+
+ fd = creat(mbox, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
+ if (fd < 0 || close(fd) < 0) {
+ logerror("Can't create mailbox %s (%s)", mbox, strerror(errno));
+ return -1;
+ }
+ return 0;
+}
-s_char *
-mailbox(s_char *buf, natid cn)
+/*
+ * Read telegram header from FP into TEL.
+ * MBOX is the file name, it is used for logging errors.
+ * Return 1 on success, 0 on EOF, -1 on error.
+ */
+int
+tel_read_header(FILE *fp, char *mbox, struct telstr *tel)
{
- (void) sprintf(buf, "%s%d", telfil, cn);
- return buf;
+ size_t n;
+
+ n = fread(tel, 1, sizeof(*tel), fp);
+ if (n == 0 && feof(fp))
+ return 0;
+ if (n != sizeof(*tel)
+ || tel->tel_type > TEL_LAST || tel->tel_from > MAXNOC) {
+ logerror("Mailbox %s corrupt: bad header", mbox);
+ return -1;
+ }
+ return 1;
}
+/*
+ * Read telegram body from FP.
+ * MBOX is the file name, it is used for logging errors.
+ * TEL is the header.
+ * Unless SINK is null, it is called like SINK(CHUNK, SZ, ARG) to
+ * consume the body, chunk by chunk. The chunks are UTF-8, and
+ * CHUNK[SZ} is 0. Reading fails when SINK() returns a negative
+ * value.
+ * Return 0 on success, -1 on failure.
+ */
+int
+tel_read_body(FILE *fp, char *mbox, struct telstr *tel,
+ int (*sink)(char *, size_t, void *),
+ void *arg)
+{
+ char buf[4096];
+ size_t left, sz;
+ left = tel->tel_length;
+ while (left) {
+ sz = MIN(left, sizeof(buf) - 1);
+ if (fread(buf, 1, sz, fp) != sz) {
+ logerror("Mailbox %s corrupt: can't read body", mbox);
+ return -1;
+ }
+ buf[sz] = 0;
+ if (sink && sink(buf, sz, arg) < 0)
+ return -1;
+ left -= sz;
+ }
+ return 0;
+}