Update copyright notice

[empserver] / src / lib / common / mailbox.c

diff --git a/src/lib/common/mailbox.c b/src/lib/common/mailbox.c
index 6205121fdb3f6fd788af0be5b3ab39c01f8e5e1c..f333cb5386884487f350b48fb931bacee3f452ab 100644 (file)
--- a/src/lib/common/mailbox.c
+++ b/src/lib/common/mailbox.c
@@ -1,11 +1,11 @@
 /*
  *  Empire - A multi-player, client/server Internet based war game.
- *  Copyright (C) 1986-2008, 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,
@@ -14,8 +14,7 @@
  *  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/>.
  *
  *  ---
  *
@@ -25,21 +24,97 @@
  *
  *  ---
  *
- *  mailbox.c: Return string containing telegram file
- * 
+ *  mailbox.c: Mailbox file access
+ *
  *  Known contributors to this file:
- *    
+ *     Markus Armbruster, 2009-2011
  */
 
 #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)
 {
-    (void)sprintf(buf, "%s%d", telfil, 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;
+}
+
+/*
+ * 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)
+{
+    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;
+}