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Address review comments

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This commit is contained in:
LemonBoy 2020-03-12 19:40:42 +01:00
parent 11df0d0cf8
commit bd0b51477a
2 changed files with 15 additions and 9 deletions
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2
lib/std/fs/file.zig
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@ -104,7 +104,7 @@ pub const File = struct {
/// Shrinks or expands the file.
/// The file offset after this call is undefined.
pub fn setEndPos(self: File, length: u64) SetEndPosError!void {
try os.truncate(self.handle, length);
try os.ftruncate(self.handle, length);
}
pub const SeekError = os.SeekError;

22
lib/std/os.zig
View File

@ -439,11 +439,13 @@ pub fn pread(fd: fd_t, buf: []u8, offset: u64) PReadError!usize {
}
pub const TruncateError = error{
/// The file descriptor is not open for writing.
NotFile,
FileTooBig,
InputOutput,
CannotTruncate,
FileBusy,
} || UnexpectedError;
pub fn truncate(fd: fd_t, length: u64) TruncateError!void {
pub fn ftruncate(fd: fd_t, length: u64) TruncateError!void {
if (std.Target.current.os.tag == .windows) {
try windows.SetFilePointerEx_BEGIN(fd, length);
@ -454,18 +456,22 @@ pub fn truncate(fd: fd_t, length: u64) TruncateError!void {
}
while (true) {
const rc = if (builtin.link_libc) blk: {
const rc = if (builtin.link_libc)
if (std.Target.current.os.tag == .linux)
break :blk system.ftruncate64(fd, @bitCast(off_t, length))
system.ftruncate64(fd, @bitCast(off_t, length))
else
break :blk system.ftruncate(fd, @bitCast(off_t, length));
} else
system.ftruncate(fd, @bitCast(off_t, length))
else
system.ftruncate(fd, length);
switch (errno(rc)) {
0 => return,
EINTR => continue,
EBADF, EINVAL => return error.NotFile,
EFBIG => return error.FileTooBig,
EIO => return error.InputOutput,
EPERM => return error.CannotTruncate,
ETXTBSY => return error.FileBusy,
EBADF, EINVAL => unreachable,
else => |err| return unexpectedErrno(err),
}
}