From c82212bcf066080e6033b4e9c7732cf4cc8bf1a7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?John=20T=C3=B6rnblom?= <john.tornblom@gmail.com>
Date: Sat, 10 Jan 2026 22:07:49 +0100
Subject: [PATCH] io: add alternative to sendflie

---
 io.c | 33 +++++++++++++++++++++++++++++++++
 io.h |  6 ++++++
 2 files changed, 39 insertions(+)

diff --git a/io.c b/io.c
index b0e1e28..f5289b1 100644
--- a/io.c
+++ b/io.c
@@ -57,6 +57,39 @@ io_nwrite(int fd, const void* buf, size_t n) {
 }
 
 
+int
+io_ncopy(int fd_in, int fd_out, size_t size) {
+  size_t copied = 0;
+  void* buf;
+  ssize_t n;
+
+  if(!(buf=malloc(IO_COPY_BUFSIZE))) {
+    return -1;
+  }
+
+  while(copied < size) {
+    n = size - copied;
+    if(n > IO_COPY_BUFSIZE) {
+      n = IO_COPY_BUFSIZE;
+    }
+
+    if(io_nread(fd_in, buf, n)) {
+      free(buf);
+      return -1;
+    }
+    if(io_nwrite(fd_out, buf, n)) {
+      free(buf);
+      return -1;
+    }
+
+    copied += n;
+  }
+
+  free(buf);
+  return 0;
+}
+
+
 int
 io_pread(int fd, void* buf, size_t n, off_t off) {
   int r;
diff --git a/io.h b/io.h
index b8ea27b..4224be0 100644
--- a/io.h
+++ b/io.h
@@ -37,6 +37,12 @@ int io_nread(int fd, void* buf, size_t n);
 int io_nwrite(int fd, const void* buf, size_t n);
 
 
+/**
+ * Copy exactly N bytes from one file descriptor to another.
+ **/
+int io_ncopy(int fd_in, int fd_out, size_t size);
+
+
 /**
  * Copy exactly N bytes from a file descriptor to a socket.
  **/