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std.system: fix slice bounds in preadMin()

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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.
This commit is contained in:
Isaac Freund 2021-11-26 19:33:42 +01:00 committed by Andrew Kelley
parent 7c2cc45ad8
commit b196dd1d79
1 changed files with 1 additions and 1 deletions
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lib/std/zig/system.zig
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@ -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,