1 files changed, 18 insertions, 0 deletions
diff --git a/src/libstddjb/siovec_trunc.c b/src/libstddjb/siovec_trunc.c
new file mode 100644
index 0000000..c09225a
--- /dev/null
+++ b/src/libstddjb/siovec_trunc.c
@@ -0,0 +1,18 @@
+/* ISC license. */
+
+#include <skalibs/bytestr.h>
+#include <skalibs/siovec.h>
+
+unsigned int siovec_trunc (siovec_t *v, unsigned int n, unsigned int len)
+{
+  register unsigned int i = siovec_len(v, n) ;
+  if (i < len) return n ;
+  len = i - len ;
+  i = n ;
+  while (len && i--)
+  {
+    register unsigned int w = len > v[i].len ? v[i].len : len ;
+    v[i].len -= w ; len -= w ;
+  }
+  return i ;
+}