From b196dd1d7958aee86095bd06190eee484a562488 Mon Sep 17 00:00:00 2001
From: Isaac Freund <mail@isaacfreund.com>
Date: Fri, 26 Nov 2021 19:33:42 +0100
Subject: [PATCH] std.system: fix slice bounds in preadMin()

If a partial read occurs past the halfway point, buf.len - i will be
less than i, which is illegal. The end bound is also entirely unecessary
in this case, so just remove it.
---
 lib/std/zig/system.zig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/std/zig/system.zig b/lib/std/zig/system.zig
index 19df6bda0b..f76382ae2d 100644
--- a/lib/std/zig/system.zig
+++ b/lib/std/zig/system.zig
@@ -922,7 +922,7 @@ pub const NativeTargetInfo = struct {
     fn preadMin(file: fs.File, buf: []u8, offset: u64, min_read_len: usize) !usize {
         var i: usize = 0;
         while (i < min_read_len) {
-            const len = file.pread(buf[i .. buf.len - i], offset + i) catch |err| switch (err) {
+            const len = file.pread(buf[i..], offset + i) catch |err| switch (err) {
                 error.OperationAborted => unreachable, // Windows-only
                 error.WouldBlock => unreachable, // Did not request blocking mode
                 error.NotOpenForReading => unreachable,