Mercurial > hg > octave-jordi > gnulib-hg

changeset 8717:3afefd650c3a

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
On BSD implementations, when we call lseek(), we must also update or disable the stream's file descriptor position cache.
author Bruno Haible <bruno@clisp.org>
date Thu, 26 Apr 2007 09:25:05 +0000
parents 43a9fb438a48
children c541fe12ef9e
files ChangeLog lib/fflush.c lib/fseeko.c tests/test-fflush.c
diffstat 4 files changed, 49 insertions(+), 3 deletions(-) [+]
line wrap: on
line diff
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2007-04-26  Bruno Haible  <bruno@clisp.org>
+
+	* tests/test-fflush.c (main): Also check the ftell result after
+	fflush and fseek/fseeko.
+	* lib/fflush.c (rpl_fflush): For BSD implementations, update the
+	file descriptor position cache in the stream.
+	* lib/fseeko.c (rpl_fseeko): Likewise.
+
 2007-04-26  Bruno Haible  <bruno@clisp.org>
 
 	* modules/fflush-tests (Depends-on): Add fseeko.
--- a/lib/fflush.c
+++ b/lib/fflush.c
@@ -58,7 +58,14 @@
      semantics of fpurge are now appropriate to clear the buffer.  To
      avoid losing data, the lseek is also necessary.  */
   result = fpurge (stream);
-  if (result == 0 && lseek (fileno (stream), pos, SEEK_SET) == -1)
+  if (result != 0)
+    return result;
+  pos = lseek (fileno (stream), pos, SEEK_SET);
+  if (pos == -1)
     return EOF;
-  return result;
+#if defined __sferror               /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
+  stream->_offset = pos;
+  stream->_flags |= __SOFF;
+#endif
+  return 0;
 }
--- a/lib/fseeko.c
+++ b/lib/fseeko.c
@@ -66,7 +66,24 @@
 #else
   #error "Please port gnulib fseeko.c to your platform! Look at the code in fpurge.c, then report this to bug-gnulib."
 #endif
-    return (lseek (fileno (fp), offset, whence) == (off_t)(-1) ? -1 : 0);
+    {
+      off_t pos = lseek (fileno (fp), offset, whence);
+      if (pos == -1)
+	{
+#if defined __sferror               /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
+	  fp->_flags &= ~__SOFF;
+#endif
+	  return -1;
+	}
+      else
+	{
+#if defined __sferror               /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
+	  fp->_offset = pos;
+	  fp->_flags |= __SOFF;
+#endif
+	  return 0;
+	}
+    }
   else
     return fseeko (fp, offset, whence);
 }
--- a/tests/test-fflush.c
+++ b/tests/test-fflush.c
@@ -74,6 +74,13 @@
       unlink ("test-fflush.txt");
       return 1;
     }
+  if (ftell (f) != 5)
+    {
+      fputs ("ftell result is wrong after fseek.\n", stderr);
+      fclose (f);
+      unlink ("test-fflush.txt");
+      return 1;
+    }
   /* Check that file reading resumes at correct location.  */
   if (fgetc (f) != '6')
     {
@@ -106,6 +113,13 @@
       unlink ("test-fflush.txt");
       return 1;
     }
+  if (ftell (f) != 6)
+    {
+      fputs ("ftell result is wrong after fseek.\n", stderr);
+      fclose (f);
+      unlink ("test-fflush.txt");
+      return 1;
+    }
   /* Check that file reading resumes at correct location.  */
   if (fgetc (f) != '7')
     {