zig

commit b7ba0b69b19a20523af751c0935882ddba579c8c (tree)
parent 574b33e65a6968928d359bc553c4e0c38312a3e9
Author: Andrew Kelley <andrew@ziglang.org>
Date:   Wed,  6 Mar 2024 18:35:04 -0700

std.io.Writer: add writeFile method

Diffstat:
M
lib/std/io/Writer.zig
 | 
11
+++++++++++

1 file changed, 11 insertions(+), 0 deletions(-)
diff --git a/lib/std/io/Writer.zig b/lib/std/io/Writer.zig
@@ -58,3 +58,14 @@ pub fn writeStruct(self: Self, value: anytype) anyerror!void {
     comptime assert(@typeInfo(@TypeOf(value)).Struct.layout != .Auto);
     return self.writeAll(mem.asBytes(&value));
 }
+
+pub fn writeFile(self: Self, file: std.fs.File) anyerror!void {
+    // TODO: figure out how to adjust std lib abstractions so that this ends up
+    // doing sendfile or maybe even copy_file_range under the right conditions.
+    var buf: [4000]u8 = undefined;
+    while (true) {
+        const n = try file.readAll(&buf);
+        try self.writeAll(buf[0..n]);
+        if (n < buf.len) return;
+    }
+}