use HOST_NAME_MAX to size buffers for gethostname(2)
POSIX limits the length of host names to HOST_NAME_MAX. Export the
fallback definition from daemon.c and use this constant to make all
buffers used with gethostname(2) big enough for any possible result
and a terminating NUL.
Inspired-by: David Turner <dturner@twosigma.com>
Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: David Turner <dturner@twosigma.com>
Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/ident.c b/ident.c
index d17b5bd..8ec0f25 100644
--- a/ident.c
+++ b/ident.c
@@ -120,7 +120,7 @@ static int canonical_name(const char *host, struct strbuf *out)
static void add_domainname(struct strbuf *out, int *is_bogus)
{
- char buf[1024];
+ char buf[HOST_NAME_MAX + 1];
if (gethostname(buf, sizeof(buf))) {
warning_errno("cannot get host name");
