Add test for FREAD_READS_DIRECTORIES to detect when fread() reads fopen'ed directory.
Signed-off-by: Michal Rokos <michal.rokos@nextsoft.cz> Tested-by: Mike Ralphson <mike@abacus.co.uk>
Show changes to 2 files +21 −0
config.mak.in, configure.ac
diff --git a/config.mak.in b/config.mak.in index 8e1cd5f..7868dfd 100644 --- a/config.mak.in +++ b/config.mak.in @@ -46,4 +46,5 @@ NO_MKDTEMP=@NO_MKDTEMP@ NO_ICONV=@NO_ICONV@ OLD_ICONV=@OLD_ICONV@ NO_DEFLATE_BOUND=@NO_DEFLATE_BOUND@ +FREAD_READS_DIRECTORIES=@FREAD_READS_DIRECTORIES@ SNPRINTF_RETURNS_BOGUS=@SNPRINTF_RETURNS_BOGUS@ diff --git a/configure.ac b/configure.ac index 287149d..82584e9 100644 --- a/configure.ac +++ b/configure.ac @@ -327,6 +327,26 @@ else 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) +# # Define SNPRINTF_RETURNS_BOGUS if your are on a system which snprintf() # or vsnprintf() return -1 instead of number of characters which would # have been written to the final string if enough space had been available.
