core: Add a limited version of gpgrt_ftruncate.

* src/gpg-error.h.in (gpgrt_ftruncate, es_ftruncate): New.
* src/gpg-error.def.in, src/gpg-error.vers: Add gpgrt_ftruncate.
* src/visibility.c (gpgrt_ftruncate): new.
* src/gpgrt-int.h (COOKIE_IOCTL_TRUNCATE): New.
* src/estream.c (func_mem_ioctl): Support new internal IOCTL.
(_gpgrt_ftruncate): New.
--

Right now the ftruncate works only on memory streams.  Can easily be
added to other stream times.

Signed-off-by: Werner Koch <wk@gnupg.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/visibility.c b/src/visibility.c
index ab5e383..1947111 100644
--- a/src/visibility.c
+++ b/src/visibility.c
@@ -390,6 +390,12 @@ gpgrt_rewind (estream_t stream)
 }
 
 int
+gpgrt_ftruncate (estream_t stream, gpgrt_off_t length)
+{
+  return _gpgrt_ftruncate (stream, length);
+}
+
+int
 gpgrt_fgetc (estream_t stream)
 {
   return _gpgrt_fgetc (stream);