X-Git-Url: https://pd.if.org/git/?p=pdclib.old;a=blobdiff_plain;f=functions%2F_PDCLIB%2Fprepread.c;h=9111ff49b9eaf0a7309d932acd216aecc2e781a3;hp=ef2f70ed72bcda6962745d0b1d053a7c0000e7bf;hb=8cfc7f73e7baec32630b9cf55582febd41b8a684;hpb=37a19e428fd1e1b348e332fdc8ee759d13ebe88b

diff --git a/functions/_PDCLIB/prepread.c b/functions/_PDCLIB/prepread.c
index ef2f70e..9111ff4 100644
--- a/functions/_PDCLIB/prepread.c
+++ b/functions/_PDCLIB/prepread.c
@@ -17,7 +17,11 @@ int _PDCLIB_prepread( struct _PDCLIB_file_t * stream )
          ( stream->status & ( _PDCLIB_FWRITE | _PDCLIB_FAPPEND | _PDCLIB_ERRORFLAG | _PDCLIB_WIDESTREAM | _PDCLIB_EOFFLAG ) ) ||
          ! ( stream->status & ( _PDCLIB_FREAD | _PDCLIB_FRW ) ) )
     {
-        _PDCLIB_errno = _PDCLIB_EIO;
+        /* 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;
     }