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package os
import "base:runtime"
import "core:strconv"
import "core:unicode/utf8"
/*
`write_string` writes a string `s` to file `f`.
Returns the number of bytes written and an error, if any is encountered.
*/
write_string :: proc(f: ^File, s: string) -> (n: int, err: Error) {
return write(f, transmute([]byte)s)
}
/*
`write_strings` writes a variadic list of strings `strings` to file `f`.
Returns the number of bytes written and an error, if any is encountered.
*/
write_strings :: proc(f: ^File, strings: ..string) -> (n: int, err: Error) {
for s in strings {
m: int
m, err = write_string(f, s)
n += m
if err != nil {
return
}
}
return
}
/*
`write_byte` writes a byte `b` to file `f`.
Returns the number of bytes written and an error, if any is encountered.
*/
write_byte :: proc(f: ^File, b: byte) -> (n: int, err: Error) {
return write(f, []byte{b})
}
/*
`write_rune` writes a rune `r` as an UTF-8 encoded string to file `f`.
Returns the number of bytes written and an error, if any is encountered.
*/
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` writes a rune `r` as an UTF-8 encoded string which with escaped control codes to file `f`.
Returns the number of bytes written and an error, if any is encountered.
*/
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.write_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` is a utility procedure that writes the bytes points at `data` with length `len`.
It is equivalent to: `write(f, ([^]byte)(data)[:len])`
*/
write_ptr :: proc(f: ^File, data: rawptr, len: int) -> (n: int, err: Error) {
return write(f, ([^]byte)(data)[:len])
}
/*
`read_ptr` is a utility procedure that reads the bytes points at `data` with length `len`.
It is equivalent to: `read(f, ([^]byte)(data)[:len])`
*/
read_ptr :: proc(f: ^File, data: rawptr, len: int) -> (n: int, err: Error) {
return read(f, ([^]byte)(data)[:len])
}
/*
`read_at_least` reads from `f` into `buf` until it has read at least `min` bytes.
It returns the number of bytes copied and an error if fewer bytes were read.
The error is only an `io.EOF` if no bytes were read.
*/
read_at_least :: proc(f: ^File, buf: []byte, min: int) -> (n: int, err: Error) {
if len(buf) < min {
return 0, .Short_Buffer
}
nn := max(int)
for nn > 0 && n < min && err == nil {
nn, err = read(f, buf[n:])
n += nn
}
if n >= min {
err = nil
}
return
}
/*
`read_full` reads exactly `len(buf)` bytes from `f` into `buf`.
It returns the number of bytes copied and an error if fewer bytes were read.
The error is only an `io.EOF` if no bytes were read.
It is equivalent to `read_at_least(f, buf, len(buf))`.
*/
read_full :: proc(f: ^File, buf: []byte) -> (n: int, err: Error) {
return read_at_least(f, buf, len(buf))
}
read_entire_file :: proc{
read_entire_file_from_path,
read_entire_file_from_file,
}
/*
`read_entire_file_from_path` reads the entire named file `name` into memory allocated with `allocator`.
A slice of bytes and an error is returned, if any error is encountered.
*/
@(require_results)
read_entire_file_from_path :: proc(name: string, allocator: runtime.Allocator, loc := #caller_location) -> (data: []byte, err: Error) {
f, ferr := open(name)
if ferr != nil {
return nil, ferr
}
defer close(f)
return read_entire_file_from_file(f=f, allocator=allocator, loc=loc)
}
/*
`read_entire_file_from_file` reads the entire file `f` into memory allocated with `allocator`.
A slice of bytes and an error is returned, if any error is encountered.
*/
@(require_results)
read_entire_file_from_file :: proc(f: ^File, allocator: runtime.Allocator, loc := #caller_location) -> (data: []byte, err: Error) {
size: int
has_size := false
if size64, serr := file_size(f); serr == nil {
if i64(int(size64)) == size64 {
has_size = true
size = int(size64)
}
}
if has_size && size > 0 {
total: int
data = make([]byte, size, allocator, loc) or_return
for total < len(data) {
n: int
n, err = read(f, data[total:])
total += n
if err != nil {
if err == .EOF {
err = nil
}
data = data[:total]
break
}
}
return
} else {
buffer: [1024]u8
out_buffer := make([dynamic]u8, 0, 0, allocator, loc)
total := 0
for {
n: int
n, err = read(f, buffer[:])
total += n
append_elems(&out_buffer, ..buffer[:n], loc=loc) or_return
if err != nil {
if err == .EOF || err == .Broken_Pipe {
err = nil
}
data = out_buffer[:total]
return
}
}
}
}
/*
`write_entire_file` writes the contents of `data` into named file `name`.
It defaults with the permssions `perm := Permissions_Read_All + {.Write_User}`, and `truncate`s by default.
An error is returned if any is encountered.
*/
write_entire_file :: proc{
write_entire_file_from_bytes,
write_entire_file_from_string,
}
/*
`write_entire_file_from_bytes` writes the contents of `data` into named file `name`.
It defaults with the permssions `perm := Permissions_Read_All + {.Write_User}`, and `truncate`s by default.
An error is returned if any is encountered.
*/
@(require_results)
write_entire_file_from_bytes :: proc(name: string, data: []byte, perm := Permissions_Read_All + {.Write_User}, truncate := true) -> Error {
flags := O_WRONLY|O_CREATE
if truncate {
flags |= O_TRUNC
}
f := open(name, flags, perm) or_return
_, err := write(f, data)
if cerr := close(f); cerr != nil && err == nil {
err = cerr
}
return err
}
/*
`write_entire_file_from_string` writes the contents of `data` into named file `name`.
It defaults with the permssions `perm := Permissions_Read_All + {.Write_User}`, and `truncate`s by default.
An error is returned if any is encountered.
*/
@(require_results)
write_entire_file_from_string :: proc(name: string, data: string, perm := Permissions_Read_All + {.Write_User}, truncate := true) -> Error {
return write_entire_file(name, transmute([]byte)data, perm, truncate)
}
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