X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2F_PDCLIB%2Fprepread.c;h=6ce38d90d2779659b62b1700fe30a7dae4436cc9;hb=f2e874bbb30fa8857975a683a17dce7669524520;hp=ef2f70ed72bcda6962745d0b1d053a7c0000e7bf;hpb=0d2a901d10b40ff99af944ed676d07e501f5e545;p=pdclib.old

diff --git a/functions/_PDCLIB/prepread.c b/functions/_PDCLIB/prepread.c
index ef2f70e..6ce38d9 100644
--- a/functions/_PDCLIB/prepread.c
+++ b/functions/_PDCLIB/prepread.c
@@ -7,8 +7,8 @@
 */
 
 #include <stdio.h>
+#include <errno.h>
 
-#define _PDCLIB_GLUE_H _PDCLIB_GLUE_H
 #include <_PDCLIB_glue.h>
 
 int _PDCLIB_prepread( struct _PDCLIB_file_t * stream )
@@ -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>.
+        */
+        errno = EINVAL;
         stream->status |= _PDCLIB_ERRORFLAG;
         return EOF;
     }