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Fix FreeBSD implementations of read_at and write_at

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These procedures must not modify the underlying file pointer.
This commit is contained in:
Feoramund
2024-08-28 19:53:20 +02:00
committed by Laytan
parent 1ced76cdd1
commit 5c8c63ae04
2 changed files with 93 additions and 12 deletions
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core/os/os_freebsd.odin
+17 -12
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@@ -6,6 +6,7 @@ foreign import libc "system:c"
import "base:runtime"
import "core:strings"
import "core:c"
import "core:sys/freebsd"
Handle :: distinct i32
File_Time :: distinct u64
@@ -481,23 +482,27 @@ write :: proc(fd: Handle, data: []byte) -> (int, Error) {
}
read_at :: proc(fd: Handle, data: []byte, offset: i64) -> (n: int, err: Error) {
curr := seek(fd, offset, SEEK_CUR) or_return
n, err = read(fd, data)
_, err1 := seek(fd, curr, SEEK_SET)
if err1 != nil && err == nil {
err = err1
if len(data) == 0 {
return 0, nil
}
return
to_read := min(uint(len(data)), MAX_RW)
bytes_read, errno := freebsd.pread(cast(freebsd.Fd)fd, data[:to_read], cast(freebsd.off_t)offset)
return bytes_read, cast(_Platform_Error)errno
}
write_at :: proc(fd: Handle, data: []byte, offset: i64) -> (n: int, err: Error) {
curr := seek(fd, offset, SEEK_CUR) or_return
n, err = write(fd, data)
_, err1 := seek(fd, curr, SEEK_SET)
if err1 != nil && err == nil {
err = err1
if len(data) == 0 {
return 0, nil
}
return
to_write := min(uint(len(data)), MAX_RW)
bytes_written, errno := freebsd.pwrite(cast(freebsd.Fd)fd, data[:to_write], cast(freebsd.off_t)offset)
return bytes_written, cast(_Platform_Error)errno
}
seek :: proc(fd: Handle, offset: i64, whence: int) -> (i64, Error) {