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Darwin: allow reading/writing files larger than max(i32)

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This commit is contained in:
Vitalii Kravchenko
2022-10-02 07:40:28 +01:00
parent 213d930f8c
commit 8a5b39f734
1 changed files with 30 additions and 12 deletions
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42
core/os/os_darwin.odin
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@@ -369,27 +369,45 @@ close :: proc(fd: Handle) -> bool {
return _unix_close(fd) == 0
}
@(private)
MAX_RW :: 0x7fffffff // The limit on Darwin is max(i32), trying to read/write more than that fails.
write :: proc(fd: Handle, data: []u8) -> (int, Errno) {
assert(fd != -1)
if len(data) == 0 {
return 0, 0
}
bytes_written := _unix_write(fd, raw_data(data), len(data))
if bytes_written == -1 {
return 0, 1
}
return bytes_written, 0
bytes_total := len(data)
bytes_written_total := 0
for bytes_written_total < bytes_total {
bytes_to_write := min(bytes_total - bytes_written_total, MAX_RW)
slice := data[bytes_written_total:bytes_written_total + bytes_to_write]
bytes_written := _unix_write(fd, raw_data(slice), bytes_to_write)
if bytes_written == -1 {
return bytes_written_total, 1
}
bytes_written_total += bytes_written
}
return bytes_written_total, 0
}
read :: proc(fd: Handle, data: []u8) -> (int, Errno) {
assert(fd != -1)
bytes_read := _unix_read(fd, raw_data(data), len(data))
if bytes_read == -1 {
return 0, 1
bytes_total := len(data)
bytes_read_total := 0
for bytes_read_total < bytes_total {
bytes_to_read := min(bytes_total - bytes_read_total, MAX_RW)
slice := data[bytes_read_total:bytes_read_total + bytes_to_read]
bytes_read := _unix_read(fd, raw_data(slice), bytes_to_read)
if bytes_read == -1 {
return bytes_read_total, 1
}
bytes_read_total += bytes_read
}
return bytes_read, 0
return bytes_read_total, 0
}
seek :: proc(fd: Handle, offset: i64, whence: int) -> (i64, Errno) {