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package os2
import "core:mem"
import "base:runtime"
import "core:strconv"
import "core:unicode/utf8"
write_string :: proc(f: ^File, s: string) -> (n: int, err: Error) {
return write(f, transmute([]byte)s)
}
write_byte :: proc(f: ^File, b: byte) -> (n: int, err: Error) {
return write(f, []byte{b})
}
write_rune :: proc(f: ^File, r: rune) -> (n: int, err: Error) {
if r < utf8.RUNE_SELF {
return write_byte(f, byte(r))
}
b: [4]byte
b, n = utf8.encode_rune(r)
return write(f, b[:n])
}
write_encoded_rune :: proc(f: ^File, r: rune) -> (n: int, err: Error) {
wrap :: proc(m: int, merr: Error, n: ^int, err: ^Error) -> bool {
n^ += m
if merr != nil {
err^ = merr
return true
}
return false
}
if wrap(write_byte(f, '\''), &n, &err) { return }
switch r {
case '\a': if wrap(write_string(f, "\\a"), &n, &err) { return }
case '\b': if wrap(write_string(f, "\\b"), &n, &err) { return }
case '\e': if wrap(write_string(f, "\\e"), &n, &err) { return }
case '\f': if wrap(write_string(f, "\\f"), &n, &err) { return }
case '\n': if wrap(write_string(f, "\\n"), &n, &err) { return }
case '\r': if wrap(write_string(f, "\\r"), &n, &err) { return }
case '\t': if wrap(write_string(f, "\\t"), &n, &err) { return }
case '\v': if wrap(write_string(f, "\\v"), &n, &err) { return }
case:
if r < 32 {
if wrap(write_string(f, "\\x"), &n, &err) { return }
b: [2]byte
s := strconv.append_bits(b[:], u64(r), 16, true, 64, strconv.digits, nil)
switch len(s) {
case 0: if wrap(write_string(f, "00"), &n, &err) { return }
case 1: if wrap(write_rune(f, '0'), &n, &err) { return }
case 2: if wrap(write_string(f, s), &n, &err) { return }
}
} else {
if wrap(write_rune(f, r), &n, &err) { return }
}
}
_ = wrap(write_byte(f, '\''), &n, &err)
return
}
write_ptr :: proc(f: ^File, data: rawptr, len: int) -> (n: int, err: Error) {
s := transmute([]byte)mem.Raw_Slice{data, len}
return write(f, s)
}
read_ptr :: proc(f: ^File, data: rawptr, len: int) -> (n: int, err: Error) {
s := transmute([]byte)mem.Raw_Slice{data, len}
return read(f, s)
}
read_entire_file :: proc{
read_entire_file_from_path,
read_entire_file_from_file,
}
read_entire_file_from_path :: proc(name: string, allocator: runtime.Allocator) -> (data: []byte, err: Error) {
f, ferr := open(name)
if ferr != nil {
return nil, ferr
}
defer close(f)
return read_entire_file_from_file(f, allocator)
}
read_entire_file_from_file :: proc(f: ^File, allocator: runtime.Allocator) -> (data: []byte, err: Error) {
size: int
if size64, err := file_size(f); err == nil {
if i64(int(size64)) != size64 {
size = int(size64)
}
}
size += 1 // for EOF
// TODO(bill): Is this correct logic?
total: int
data = make([]byte, size, allocator) or_return
for {
n: int
n, err = read(f, data[total:])
total += n
if err != nil {
if err == .EOF {
err = nil
}
data = data[:total]
return
}
}
}
write_entire_file :: proc(name: string, data: []byte, perm: File_Mode, truncate := true) -> Error {
flags := O_WRONLY|O_CREATE
if truncate {
flags |= O_TRUNC
}
f, err := open(name, flags, perm)
if err != nil {
return err
}
_, err = write(f, data)
if cerr := close(f); cerr != nil && err == nil {
err = cerr
}
return err
}
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