:sig
u64 file_pwrite(u64 h, u64 offset, String data)

:params
h : handle from file_open() opened for writing
offset : absolute byte offset to write at
data : bytes to write
return value : number of bytes written

:content
Writes `data` at an absolute `offset` without moving the handle's current offset. The handle must be opened with a writable mode (`"r+"` for in-place edits).

:example
u64 h = file_open("/tmp/doc-pwrite.txt", "w");
file_write(h, "hello world");
file_close(h);
u64 e = file_open("/tmp/doc-pwrite.txt", "r+");
file_pwrite(e, 6, "earth");
file_close(e);
print(file_get_contents("/tmp/doc-pwrite.txt"), "\n");

:see
>sys
file_write
file_pread
file_open
