Disable native strndup and strnlen on AIX.

On at least some revisions of AIX, strndup returns unterminated strings
under some conditions, apparently because strnlen returns incorrect
values in those cases.  Disable both on AIX and use the replacements
from openbsd-compat.  Fixes problem with ECDSA keys there, ok djm.

3 files changed, 4 insertions, 2 deletions

diff --git a/configure.ac b/configure.ac
index bedacc2db..663062bef 100644
--- a/configure.ac
+++ b/configure.ac
@@ -603,6 +603,8 @@ case "$host" in
             [AIX 5.2 and 5.3 (and presumably newer) require this])
         AC_DEFINE([PTY_ZEROREAD], [1], [read(1) can return 0 for a non-closed fd])
         AC_DEFINE([PLATFORM_SYS_DIR_UID], 2, [System dirs owned by bin (uid 2)])
+        AC_DEFINE([BROKEN_STRNDUP], 1, [strndup broken, see APAR IY61211])
+        AC_DEFINE([BROKEN_STRNLEN], 1, [strnlen broken, see APAR IY62551])
         ;;
 *-*-android*)
         AC_DEFINE([DISABLE_UTMP], [1], [Define if you don't want to use utmp])
diff --git a/openbsd-compat/strndup.c b/openbsd-compat/strndup.c
index 0fcb96f6b..ebb4eccfb 100644
--- a/openbsd-compat/strndup.c
+++ b/openbsd-compat/strndup.c
@@ -17,7 +17,7 @@
  */
 
 #include "config.h"
-#ifndef HAVE_STRNDUP
+#if !defined(HAVE_STRNDUP) || defined(BROKEN_STRNDUP)
 #include <sys/types.h>
 
 #include <stddef.h>
diff --git a/openbsd-compat/strnlen.c b/openbsd-compat/strnlen.c
index 93d515595..8cc6b96b5 100644
--- a/openbsd-compat/strnlen.c
+++ b/openbsd-compat/strnlen.c
@@ -19,7 +19,7 @@
 /* OPENBSD ORIGINAL: lib/libc/string/strnlen.c */
 
 #include "config.h"
-#ifndef HAVE_STRNLEN
+#if !defined(HAVE_STRNLEN) || defined(BROKEN_STRNLEN)
 #include <sys/types.h>
 
 #include <string.h>