120 lines
3.1 KiB
C
120 lines
3.1 KiB
C
/*
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* Empire - A multi-player, client/server Internet based war game.
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* Copyright (C) 1986-2015, Dave Pare, Jeff Bailey, Thomas Ruschak,
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* Ken Stevens, Steve McClure, Markus Armbruster
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*
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* Empire is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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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, see <http://www.gnu.org/licenses/>.
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*
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* ---
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*
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* See files README, COPYING and CREDITS in the root of the source
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* tree for related information and legal notices. It is expected
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* that future projects/authors will amend these files as needed.
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*
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* ---
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*
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* mailbox.c: Mailbox file access
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*
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* Known contributors to this file:
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* Markus Armbruster, 2009-2011
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*/
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#include <config.h>
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#include <stdio.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "optlist.h"
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#include "tel.h"
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#include "prototypes.h"
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char *
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mailbox(char *buf, natid cn)
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{
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sprintf(buf, "%s/tel%d", teldir, cn);
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return buf;
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}
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/*
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* Create an empty telegram file named @mbox.
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* Return 0 on success, -1 on failure.
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*/
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int
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mailbox_create(char *mbox)
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{
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int fd;
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fd = creat(mbox, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
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if (fd < 0 || close(fd) < 0) {
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logerror("Can't create mailbox %s (%s)", mbox, strerror(errno));
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return -1;
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}
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return 0;
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}
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/*
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* Read telegram header from @fp into @tel.
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* @mbox is the file name, it is used for logging errors.
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* Return 1 on success, 0 on EOF, -1 on error.
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*/
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int
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tel_read_header(FILE *fp, char *mbox, struct telstr *tel)
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{
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size_t n;
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n = fread(tel, 1, sizeof(*tel), fp);
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if (n == 0 && feof(fp))
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return 0;
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if (n != sizeof(*tel)
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|| tel->tel_type > TEL_LAST || tel->tel_from > MAXNOC) {
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logerror("Mailbox %s corrupt: bad header", mbox);
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return -1;
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}
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return 1;
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}
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/*
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* Read telegram body from @fp.
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* @mbox is the file name, it is used for logging errors.
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* @tel is the header.
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* Unless @sink is null, it is called like @sink(CHUNK, SZ, @arg) to
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* consume the body, chunk by chunk. The chunks are UTF-8, and
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* CHUNK[SZ] is 0. Reading fails when @sink() returns a negative
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* value.
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* Return 0 on success, -1 on failure.
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*/
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int
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tel_read_body(FILE *fp, char *mbox, struct telstr *tel,
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int (*sink)(char *, size_t, void *),
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void *arg)
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{
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char buf[4096];
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size_t left, sz;
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left = tel->tel_length;
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while (left) {
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sz = MIN(left, sizeof(buf) - 1);
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if (fread(buf, 1, sz, fp) != sz) {
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logerror("Mailbox %s corrupt: can't read body", mbox);
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return -1;
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}
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buf[sz] = 0;
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if (sink && sink(buf, sz, arg) < 0)
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return -1;
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left -= sz;
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}
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return 0;
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}
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