X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2F_PDCLIB%2Fprepwrite.c;h=1b1c4b526eecceee5105e9ef544aa761d2928bcc;hb=219271fd548949abce8bd75c34dd42e519418fc4;hp=c5a4c127543b40b14f016c60b3ac0fd04272538d;hpb=9e1a90fce7fa732ebca11e98a41dc8418746b942;p=pdclib

diff --git a/functions/_PDCLIB/prepwrite.c b/functions/_PDCLIB/prepwrite.c
index c5a4c12..1b1c4b5 100644
--- a/functions/_PDCLIB/prepwrite.c
+++ b/functions/_PDCLIB/prepwrite.c
@@ -7,20 +7,27 @@
 */
 
 #include <stdio.h>
+#include <errno.h>
 
+#ifndef REGTEST
 int _PDCLIB_prepwrite( struct _PDCLIB_file_t * stream )
 {
     if ( ( stream->bufidx < stream->bufend ) || ( stream->ungetidx > 0 ) ||
          ( stream->status & ( _PDCLIB_FREAD | _PDCLIB_ERRORFLAG | _PDCLIB_WIDESTREAM | _PDCLIB_EOFFLAG ) ) ||
          ! ( stream->status & ( _PDCLIB_FWRITE | _PDCLIB_FAPPEND | _PDCLIB_FRW ) ) )
     {
-        _PDCLIB_errno = _PDCLIB_EIO;
+        /* Function called on illegal (e.g. input) stream.
+           See the comments on implementation-defined errno values in
+           <_PDCLIB_config.h>.
+        */
+        errno = EINVAL;
         stream->status |= _PDCLIB_ERRORFLAG;
         return EOF;
     }
     stream->status |= _PDCLIB_FWRITE | _PDCLIB_BYTESTREAM;
     return 0;
 }
+#endif
 
 #ifdef TEST
 #include <_PDCLIB_test.h>