[PATCH] Configure test for FREAD_READS_DIRECTORIES

[Michal Rokos <michal.rokos@nextsoft.cz>]

Hello,

this patch adds missing tests for FREAD_READS_DIRECTORIES.

Signed-off-by: Michal Rokos <michal.rokos@nextsoft.cz>

diff --git a/Makefile b/Makefile
index ca5aad9..344ab49 100644
--- a/Makefile
+++ b/Makefile
@@ -526,6 +526,7 @@ ifeq ($(uname_S),HP-UX)
 	NO_UNSETENV = YesPlease
 	NO_HSTRERROR = YesPlease
 	NO_SYS_SELECT_H = YesPlease
+	FREAD_READS_DIRECTORIES = UnfortunatelyYes
 endif
 ifneq (,$(findstring arm,$(uname_M)))
 	ARM_SHA1 = YesPlease
diff --git a/config.mak.in b/config.mak.in
index ee6c33d..516c468 100644
--- a/config.mak.in
+++ b/config.mak.in
@@ -46,3 +46,4 @@ NO_MKDTEMP=@NO_MKDTEMP@
 NO_ICONV=@NO_ICONV@
 OLD_ICONV=@OLD_ICONV@
 NO_DEFLATE_BOUND=@NO_DEFLATE_BOUND@
+FREAD_READS_DIRECTORIES=@FREAD_READS_DIRECTORIES@
diff --git a/configure.ac b/configure.ac
index 85d7ef5..0ac28f6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -326,6 +326,27 @@ else
 	NO_C99_FORMAT=
 fi
 AC_SUBST(NO_C99_FORMAT)
+#
+# Define FREAD_READS_DIRECTORIES if your are on a system which succeeds
+# when attempting to read from an fopen'ed directory.
+AC_CACHE_CHECK([whether system succeeds to read fopen'ed directory],
+ [ac_cv_fread_reads_directories],
+[
+AC_RUN_IFELSE(
+	[AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
+		[[char c;
+		FILE *f = fopen("/etc", "r");
+		if (! f) return 0;
+		if (f && fread(&c, 1, 1, f) > 0) return 1]])],
+	[ac_cv_fread_reads_directories=no],
+	[ac_cv_fread_reads_directories=yes])
+])
+if test $ac_cv_fread_reads_directories = yes; then
+	FREAD_READS_DIRECTORIES=UnfortunatelyYes
+else
+	FREAD_READS_DIRECTORIES=
+fi
+AC_SUBST(FREAD_READS_DIRECTORIES)
 
 
 ## Checks for library functions.