2 * General utility functions for udp tunnel
5 * Copyright (C) 2000 Ian Jackson
7 * This is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with userv-utils; if not, write to the Free Software
19 * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
28 #include "forwarder.h"
30 const char *const *argv
;
31 char programid
[SYS_NMLN
+sizeof(PROGRAM
)+3];
33 void arg_assert_fail(const char *msg
) {
34 fprintf(stderr
, PROGRAM
": argument error (!`%s')\n",msg
);
38 void sysfail(const char *msg
) {
39 fprintf(stderr
, "%s: fatal system error: %s: %s\n", programid
, msg
, strerror(errno
));
43 void fail(const char *msg
) {
44 fprintf(stderr
, "%s: fatal error: %s\n", programid
, msg
);
48 void sysdiag(const char *msg
) {
49 fprintf(stderr
, "%s: system/network error: %s: %s\n", programid
, msg
, strerror(errno
));
52 void diag(const char *msg
) {
53 fprintf(stderr
, "%s: %s\n", programid
, msg
);
58 if (time(&r
) == (time_t)-1) sysfail("get time of day");
62 void *xmalloc(size_t sz
) {
65 if (!r
) sysfail("allocate memory");
69 void write_must(int fd
, const void *p_in
, int sz
, const char *what
) {
70 const unsigned char *p
= p_in
;
76 if (errno
== EINTR
) continue;
85 void read_must(int fd
, void *p_in
, int sz
, const char *what
) {
86 unsigned char *p
= p_in
;
92 if (errno
== EINTR
) continue;
102 const char *getarg_string(void) {
110 unsigned long getarg_ulong(void) {
114 ul
= strtoul(getarg_string(),&ep
,0);
119 void *buf_append(struct buffer
*buf
, size_t amount
) {
122 p
= buf
->start
+ buf
->size
;
127 void *buf_prepend(struct buffer
*buf
, size_t amount
) {
129 return buf
->start
-= amount
;
132 void *buf_unappend(struct buffer
*buf
, size_t amount
) {
133 if (buf
->size
< amount
) return 0;
134 return buf
->start
+ (buf
->size
-= amount
);
137 void *buf_unprepend(struct buffer
*buf
, size_t amount
) {
141 buf
->start
+= amount
;