Add test for FREAD_READS_DIRECTORIES to detect when fread() reads fopen'ed
directory.
Signed-off-by: Michal Rokos <michal.rokos@xxxxxxxxxxx>
Tested-by: Johannes Schindelin <Johannes.Schindelin@xxxxxx>
Tested-by: Mike Ralphson <mike@xxxxxxxxxxxx>
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..2deeb44 100644
--- a/configure.ac
+++ b/configure.ac
@@ -326,6 +326,26 @@ 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(".", "r");
+ return f && fread(&c, 1, 1, f)]])],
+ [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.
--
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