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Make Windows pread and pwrite conform to POSIX

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This commit is contained in:
Feoramund
2024-08-19 17:29:23 -04:00
committed by Laytan
parent 5c8c63ae04
commit 861d892ffe
1 changed files with 8 additions and 20 deletions
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28
core/os/file_windows.odin
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@@ -225,11 +225,13 @@ file_size :: proc(fd: Handle) -> (i64, Error) {
MAX_RW :: 1<<30
@(private)
pread :: proc(fd: Handle, data: []byte, offset: i64) -> (int, Error) {
pread :: proc(fd: Handle, data: []byte, offset: i64) -> (n: int, err: Error) {
curr_off := seek(fd, 0, 1) or_return
defer seek(fd, curr_off, 0)
buf := data
if len(buf) > MAX_RW {
buf = buf[:MAX_RW]
}
o := win32.OVERLAPPED{
@@ -249,11 +251,13 @@ pread :: proc(fd: Handle, data: []byte, offset: i64) -> (int, Error) {
return int(done), e
}
@(private)
pwrite :: proc(fd: Handle, data: []byte, offset: i64) -> (int, Error) {
pwrite :: proc(fd: Handle, data: []byte, offset: i64) -> (n: int, err: Error) {
curr_off := seek(fd, 0, 1) or_return
defer seek(fd, curr_off, 0)
buf := data
if len(buf) > MAX_RW {
buf = buf[:MAX_RW]
}
o := win32.OVERLAPPED{
@@ -273,13 +277,6 @@ pwrite :: proc(fd: Handle, data: []byte, offset: i64) -> (int, Error) {
/*
read_at returns n: 0, err: 0 on EOF
on Windows, read_at changes the position of the file cursor, on *nix, it does not.
bytes: [8]u8{}
read_at(fd, bytes, 0)
read(fd, bytes)
will read from the location twice on *nix, and from two different locations on Windows
*/
read_at :: proc(fd: Handle, data: []byte, offset: i64) -> (n: int, err: Error) {
if offset < 0 {
@@ -304,15 +301,6 @@ read_at :: proc(fd: Handle, data: []byte, offset: i64) -> (n: int, err: Error) {
return
}
/*
on Windows, write_at changes the position of the file cursor, on *nix, it does not.
bytes: [8]u8{}
write_at(fd, bytes, 0)
write(fd, bytes)
will write to the location twice on *nix, and to two different locations on Windows
*/
write_at :: proc(fd: Handle, data: []byte, offset: i64) -> (n: int, err: Error) {
if offset < 0 {
return 0, .Invalid_Offset