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Fix NetBSD 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
2024-08-19 17:41:06 -04:00
committed by Laytan
parent 861d892ffe
commit 7061032db6
1 changed files with 22 additions and 12 deletions
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34
core/os/os_netbsd.odin
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@@ -426,7 +426,9 @@ foreign libc {
@(link_name="open") _unix_open :: proc(path: cstring, flags: c.int, #c_vararg mode: ..u32) -> Handle ---
@(link_name="close") _unix_close :: proc(fd: Handle) -> c.int ---
@(link_name="read") _unix_read :: proc(fd: Handle, buf: rawptr, size: c.size_t) -> c.ssize_t ---
@(link_name="pread") _unix_pread :: proc(fd: Handle, buf: rawptr, size: c.size_t, offset: i64) -> c.ssize_t ---
@(link_name="write") _unix_write :: proc(fd: Handle, buf: rawptr, size: c.size_t) -> c.ssize_t ---
@(link_name="pwrite") _unix_pwrite :: proc(fd: Handle, buf: rawptr, size: c.size_t, offset: i64) -> c.ssize_t ---
@(link_name="lseek") _unix_seek :: proc(fd: Handle, offset: i64, whence: c.int) -> i64 ---
@(link_name="getpagesize") _unix_getpagesize :: proc() -> c.int ---
@(link_name="stat") _unix_stat :: proc(path: cstring, stat: ^OS_Stat) -> c.int ---
@@ -535,23 +537,31 @@ 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 := _unix_pread(fd, raw_data(data), to_read, offset)
if bytes_read < 0 {
return -1, get_last_error()
}
return bytes_read, nil
}
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 := _unix_pwrite(fd, raw_data(data), to_write, offset)
if bytes_written < 0 {
return -1, get_last_error()
}
return bytes_written, nil
}
seek :: proc(fd: Handle, offset: i64, whence: int) -> (i64, Error) {