Import dlmalloc (public domain) as a malloc implementation. Add stub opt/notime

[pdclib] / functions / _PDCLIB / prepwrite.c

diff --git a/functions/_PDCLIB/prepwrite.c b/functions/_PDCLIB/prepwrite.c
index c5a4c127543b40b14f016c60b3ac0fd04272538d..0b31529d5d74693e40c97010d8d946acb549cbf8 100644 (file)
--- a/functions/_PDCLIB/prepwrite.c
+++ b/functions/_PDCLIB/prepwrite.c
@@ -7,6 +7,7 @@
 */
 
 #include <stdio.h>
+#include <errno.h>
 
 int _PDCLIB_prepwrite( struct _PDCLIB_file_t * stream )
 {
@@ -14,7 +15,11 @@ int _PDCLIB_prepwrite( struct _PDCLIB_file_t * stream )
          ( 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;
     }