Comment cleanups.

[pdclib] / functions / stdio / clearerr.c

diff --git a/functions/stdio/clearerr.c b/functions/stdio/clearerr.c
index 6d80c8aeb381639c62b9fbf0a4194ff68b083bc7..5664bbfcd4b272ac7c5c1217a04f43054887a1be 100644 (file)
--- a/functions/stdio/clearerr.c
+++ b/functions/stdio/clearerr.c
@@ -1,5 +1,3 @@
-/* $Id$ */
-
 /* clearerr( FILE * )
 
    This file is part of the Public Domain C Library (PDCLib).
@@ -22,8 +20,32 @@ void clearerr( struct _PDCLIB_file_t * stream )
 
 int main( void )
 {
-    TESTCASE( NO_TESTDRIVER );
+    FILE * fh;
+    TESTCASE( ( fh = tmpfile() ) != NULL );
+    /* Flags should be clear */
+    TESTCASE( ! ferror( fh ) );
+    TESTCASE( ! feof( fh ) );
+    /* Reading from input stream - should provoke error */
+    /* FIXME: Apparently glibc disagrees on this assumption. How to provoke error on glibc? */
+    TESTCASE( fgetc( fh ) == EOF );
+    TESTCASE( ferror( fh ) );
+    TESTCASE( ! feof( fh ) );
+    /* clearerr() should clear flags */
+    clearerr( fh );
+    TESTCASE( ! ferror( fh ) );
+    TESTCASE( ! feof( fh ) );
+    /* Reading from empty stream - should provoke EOF */
+    rewind( fh );
+    TESTCASE( fgetc( fh ) == EOF );
+    TESTCASE( ! ferror( fh ) );
+    TESTCASE( feof( fh ) );
+    /* clearerr() should clear flags */
+    clearerr( fh );
+    TESTCASE( ! ferror( fh ) );
+    TESTCASE( ! feof( fh ) );
+    TESTCASE( fclose( fh ) == 0 );
     return TEST_RESULTS;
 }
 
 #endif
+