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/* This file is part of Mailfromd. -*- c -*-
Copyright (C) 2009 Sergey Poznyakoff
This program 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 3, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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, see <http://www.gnu.org/licenses/>. */
#ifndef ENAMETOOLONG
# define ENAMETOOLONG 0
#endif
#ifndef INITIAL_HOSTNAME_LENGTH
# define INITIAL_HOSTNAME_LENGTH 34
#endif
#ifndef INITIAL_DOMAINNAME_LENGTH
# define INITIAL_DOMAINNAME_LENGTH 34
#endif
/* string gethostname()
This implementation is based on xgethostname by Jim Meyering
*/
MF_DEFUN(gethostname, STRING)
{
size_t size = INITIAL_HOSTNAME_LENGTH;
MF_OBSTACK_BEGIN();
while (1) {
size_t nsize;
size_t size_1;
char *hostname;
MF_OBSTACK_GROW(NULL, size);
hostname = MF_OBSTACK_BASE();
/* Use SIZE_1 here rather than SIZE to work around the bug in
SunOS 5.5's gethostname whereby it NUL-terminates HOSTNAME
even when the name is as long as the supplied buffer. */
size_1 = size - 1;
hostname[size_1 - 1] = '\0';
errno = 0;
if (gethostname(hostname, size_1) == 0) {
if (!hostname[size_1 - 1])
break;
} else if (errno != 0
&& errno != ENAMETOOLONG && errno != EINVAL
/* OSX/Darwin does this when the buffer is not
large enough */
&& errno != ENOMEM) {
int saved_errno = errno;
MF_OBSTACK_CANCEL();
MF_THROW(mfe_failure,
"%s", mu_strerror(saved_errno));
}
nsize = size * 2;
if (nsize <= size) {
MF_OBSTACK_CANCEL();
MF_THROW(mfe_failure,
"%s", mu_strerror(ENOMEM));
}
size = nsize;
}
MF_RETURN_OBSTACK();
}
END
/* string getdomainname()
This implementation is based on xgetdomainname by Jim Meyering
*/
MF_DEFUN(getdomainname, STRING)
{
size_t size = INITIAL_DOMAINNAME_LENGTH;
MF_OBSTACK_BEGIN();
while (1) {
size_t nsize;
size_t size_1;
char *domainname;
int rc;
MF_OBSTACK_GROW(NULL, size);
domainname = MF_OBSTACK_BASE();
size_1 = size - 1;
domainname[size_1 - 1] = '\0';
errno = 0;
rc = getdomainname(domainname, size);
if (rc >= 0 && domainname[size_1] == '\0')
break;
else if (rc < 0 && errno != EINVAL) {
int saved_errno = errno;
MF_OBSTACK_CANCEL();
MF_THROW(mfe_failure,
"%s", mu_strerror(saved_errno));
}
nsize = size * 2;
if (nsize <= size) {
MF_OBSTACK_CANCEL();
MF_THROW(mfe_failure,
"%s", mu_strerror(ENOMEM));
}
size = nsize;
}
MF_RETURN_OBSTACK();
}
END
MF_INIT
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