1 files changed, 50 insertions, 0 deletions
diff --git a/src/pdclib/functions/_PDCLIB/_PDCLIB_prepread.c b/src/pdclib/functions/_PDCLIB/_PDCLIB_prepread.c
new file mode 100644
index 0000000..1d60642
--- /dev/null
+++ b/src/pdclib/functions/_PDCLIB/_PDCLIB_prepread.c
@@ -0,0 +1,50 @@
+/* _PDCLIB_prepread( struct _PDCLIB_file_t * )
+
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <stdio.h>
+
+#ifndef REGTEST
+
+#include "pdclib/_PDCLIB_glue.h"
+
+int _PDCLIB_prepread( struct _PDCLIB_file_t * stream )
+{
+    if ( ( stream->bufidx > stream->bufend ) ||
+         ( stream->status & ( _PDCLIB_FWRITE | _PDCLIB_FAPPEND | _PDCLIB_ERRORFLAG | _PDCLIB_WIDESTREAM | _PDCLIB_EOFFLAG ) ) ||
+         ! ( stream->status & ( _PDCLIB_FREAD | _PDCLIB_FRW ) ) )
+    {
+        /* Function called on illegal (e.g. output) stream.
+           See comments on implementation-defined errno values in
+           <_PDCLIB_config.h>.
+        */
+        _PDCLIB_errno = _PDCLIB_ERROR;
+        stream->status |= _PDCLIB_ERRORFLAG;
+        return EOF;
+    }
+    stream->status |= _PDCLIB_FREAD | _PDCLIB_BYTESTREAM;
+    if ( ( stream->bufidx == stream->bufend ) && ( stream->ungetidx == 0 ) )
+    {
+        return _PDCLIB_fillbuffer( stream );
+    }
+    else
+    {
+        return 0;
+    }
+}
+
+#endif
+
+#ifdef TEST
+
+#include "_PDCLIB_test.h"
+
+int main( void )
+{
+    /* Testing covered by ftell.c */
+    return TEST_RESULTS;
+}
+
+#endif