128 lines
2.7 KiB
C
128 lines
2.7 KiB
C
/*
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* Empire - A multi-player, client/server Internet based war game.
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* Copyright (C) 1986-2021, 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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* expect.c: Read from the socket, expecting to see a particular code.
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*
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* Known contributors to this file:
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* Steve McClure, 1998
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* Markus Armbruster, 2007-2013
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*/
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#include <config.h>
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#include <ctype.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <unistd.h>
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#include "misc.h"
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#include "proto.h"
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int
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recvline(int s, char *buf)
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{
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int sz = 1024;
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char *bp;
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char ch;
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ssize_t n;
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bp = buf;
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for (;;) {
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n = read(s, &ch, 1);
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if (n < 0) {
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if (errno != EINTR) {
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perror("read");
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exit(1);
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}
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continue;
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}
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if (n == 0)
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return -1;
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if (ch == '\n')
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break;
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if (bp < buf + sz - 2)
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*bp++ = ch;
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/* else silently truncate */
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}
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*bp++ = ch;
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*bp = 0;
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return parseid(buf);
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}
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int
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parseid(char *line)
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{
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char *end;
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long id;
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id = strtol(line, &end, 36);
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if (end == line || *end != ' ') {
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fprintf(stderr, "Malformed ID in line %s", line);
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id = -1;
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}
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if (id > C_LAST)
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id = -1;
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return id;
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}
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int
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expect(int s, int match, char *buf)
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{
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return recvline(s, buf) == match;
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}
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void
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sendcmd(int s, char *cmd, char *arg)
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{
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char buf[128];
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char *p;
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ssize_t n;
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int len;
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len = snprintf(buf, sizeof(buf), "%s%s%s\n",
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cmd, arg ? " " : "", arg ? arg : "");
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if (len >= (int)sizeof(buf)) {
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fprintf(stderr, "%s too long\n", cmd);
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exit(1);
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}
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p = buf;
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while (len > 0) {
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n = write(s, buf, len);
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if (n < 0) {
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if (errno != EINTR) {
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perror("sendcmd: write");
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exit(1);
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}
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n = 0;
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}
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p += n;
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len -= n;
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}
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}
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