1 files changed, 61 insertions, 0 deletions
diff --git a/src/libstddjb/iobufferk_flush.c b/src/libstddjb/iobufferk_flush.c
new file mode 100644
index 0000000..fb51e32
--- /dev/null
+++ b/src/libstddjb/iobufferk_flush.c
@@ -0,0 +1,61 @@
+/* ISC license. */
+
+#include <skalibs/sysdeps.h>
+
+#ifdef SKALIBS_HASSPLICE
+
+#include <skalibs/nonposix.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <skalibs/iobuffer.h>
+
+static int iobufferk_flush_0 (iobufferk_ref k)
+{
+  while (k->n)
+  {
+    register int r = splice(k->fd[0], 0, k->p[1], 0, k->n, 0) ;
+    if (r < 0) return 0 ;
+    else if (!r) break ;
+    k->n -= r ;
+  }
+  return 1 ;
+}
+
+static int fakeflush (iobufferk_ref k)
+{
+  k->n = 0 ;
+  return 1 ;
+}
+
+static int iobufferk_flush_3 (iobufferk_ref k)
+{
+  while (k->n)
+  {
+    register int r = splice(k->p[0], 0, k->fd[1], 0, k->n, SPLICE_F_MORE | (k->nb & 2 ? SPLICE_F_NONBLOCK : 0)) ;
+    if (r < 0)
+    {
+      if (errno == EINVAL) errno = ENOSYS ;
+      return 0 ;
+    }
+    else if (!r) return (errno = EPIPE, 0) ;
+    k->n -= r ;
+  }
+  return 1 ;
+}
+
+iobufferk_io_func_t_ref const iobufferk_flush_f[4] =
+{
+  &iobufferk_flush_0, &fakeflush, &fakeflush, &iobufferk_flush_3
+} ;
+
+#else
+
+#include <errno.h>
+#include <skalibs/iobuffer.h>
+
+iobufferk_io_func_t_ref const iobufferk_flush_f[4] =
+{
+  &iobufferk_nosys, &iobufferk_nosys, &iobufferk_nosys, &iobufferk_nosys
+} ;
+
+#endif