Tue Feb 27 12:14:59 1996 Roland McGrath <roland@charlie-brown.gnu.ai.mit.edu>

* time/strftime.c: Support - and _ flags to affect number padding.

	* sysdeps/unix/common/tcsendbrk.c: New file.

sysdeps/unix/common/tcsendbrk.c

@@ -0,0 +1,47 @@
+/* Send break to terminal.
+Copyright (C) 1996 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <errno.h>
+#include <stddef.h>
+#include <termios.h>
+#include <sys/ioctl.h>
+
+/* Send zero bits on FD.  */
+int
+tcsendbreak (int fd, int duration)
+{
+  /* The break lasts 0.25 to 0.5 seconds if DURATION is zero,
+     and an implementation-defined period if DURATION is nonzero.
+     We define a positive DURATION to be number of milliseconds to break.  */
+  if (duration <= 0)
+    return __ioctl (fd, TCSBRK, 0);
+
+#ifdef TCSBRKP
+  /* Probably Linux-specific: a positive third TCSBRKP ioctl argument is
+     defined to be the number of 100ms units to break.  */
+  return __ioctl (fd, TCSBRKP, (duration + 99) / 100);
+#else
+  /* ioctl can't send a break of any other duration for us.
+     This could be changed to use trickery (e.g. lower speed and
+     send a '\0') to send the break, but for now just return an error.  */
+  errno = EINVAL;
+  return -1;
+#endif
+}
+