Initial project import
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@@ -0,0 +1,693 @@
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module os
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// NotExpected is a generic error that means that we receave a not expected error.
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pub struct NotExpected {
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cause string
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code int
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}
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fn (err NotExpected) msg() string {
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return err.cause
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}
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fn (err NotExpected) code() int {
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return err.code
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}
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pub struct File {
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mut:
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cfile voidptr // Using void* instead of FILE*
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pub:
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fd int
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pub mut:
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is_opened bool
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}
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fn C.fseeko(&C.FILE, u64, i32) i32
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fn C._fseeki64(&C.FILE, u64, i32) i32
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fn C.getc(&C.FILE) i32
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fn C.freopen(&char, &char, &C.FILE) &C.FILE
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fn C._wfreopen(&u16, &u16, &C.FILE) &C.FILE
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fn fix_windows_path(path string) string {
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mut p := path
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$if windows {
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p = path.replace('/', '\\')
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}
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return p
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}
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// open_file tries to open or create a file with custom flags and permissions.
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@[noinline]
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pub fn open_file(path string, mode string, options ...int) !File {
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mut flags := 0
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mut seek_to_end := false
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for m in mode {
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match m {
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`w` {
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flags |= o_create | o_trunc | o_wronly
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}
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`a` {
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flags |= o_create | o_append | o_wronly
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seek_to_end = true
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}
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`r` {
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flags |= o_rdonly
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}
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`b` {
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flags |= o_binary
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}
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`s` {
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flags |= o_sync
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}
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`n` {
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flags |= o_nonblock
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}
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`c` {
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flags |= o_noctty
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}
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`+` {
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flags &= ~o_wronly
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flags |= o_rdwr
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}
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else {}
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}
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}
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if mode == 'r+' {
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flags = o_rdwr
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}
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mut permission := 0o666
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if options.len > 0 {
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permission = options[0]
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}
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$if windows {
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if permission < 0o600 {
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permission = 0x0100
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} else {
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permission = 0x0100 | 0x0080
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}
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}
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p := fix_windows_path(path)
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fd := $if windows {
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C._wopen(p.to_wide(), flags, permission)
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} $else {
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C.open(&char(p.str), flags, permission)
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}
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if fd == -1 {
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return error(posix_get_error_msg(C.errno))
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}
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mut cfile := C.fdopen(fd, &char(mode.str))
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if isnil(cfile) {
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return error('Failed to open or create file "${path}"')
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}
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mut res := File{
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cfile: cfile
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fd: fd
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is_opened: true
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}
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if seek_to_end {
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// ensure appending will work, even on bsd/macos systems:
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res.seek(0, .end) or {}
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}
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return res
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}
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// open tries to open a file from a given path for reading.
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pub fn open(path string) !File {
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/*
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$if linux {
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$if !android {
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fd := C.syscall(sys_open, path.str, 511)
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if fd == -1 {
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return error('failed to open file "${path}"')
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}
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return File{
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fd: fd
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is_opened: true
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}
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}
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}
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*/
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cfile := vfopen(path, 'rb')!
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fd := fileno(cfile)
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return File{
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cfile: cfile
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fd: fd
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is_opened: true
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}
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}
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// create creates or opens a file at a specified location and returns a write-only `File` object.
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@[noinline]
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pub fn create(path string) !File {
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cfile := vfopen(path, 'wb')!
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fd := fileno(cfile)
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return File{
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cfile: cfile
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fd: fd
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is_opened: true
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}
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}
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// stdin returns an os.File for stdin.
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pub fn stdin() File {
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return File{
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fd: 0
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cfile: voidptr(C.stdin)
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is_opened: true
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}
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}
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// stdout returns an os.File for stdout.
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pub fn stdout() File {
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return File{
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fd: 1
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cfile: voidptr(C.stdout)
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is_opened: true
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}
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}
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// stderr returns an os.File for stderr.
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pub fn stderr() File {
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return File{
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fd: 2
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cfile: voidptr(C.stderr)
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is_opened: true
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}
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}
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// eof returns true, when the end of file has been reached.
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pub fn (f &File) eof() bool {
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cfile := unsafe { &C.FILE(f.cfile) }
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return C.feof(cfile) != 0
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}
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// reopen allows a `File` to be reused. It is mostly useful for reopening standard input and output.
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pub fn (mut f File) reopen(path string, mode string) ! {
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p := fix_windows_path(path)
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mut cfile := &C.FILE(unsafe { nil })
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$if windows {
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cfile = C._wfreopen(p.to_wide(), mode.to_wide(), f.cfile)
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} $else {
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cfile = C.freopen(&char(p.str), &char(mode.str), f.cfile)
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}
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if isnil(cfile) {
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return error('Failed to reopen file "${path}"')
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}
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f.cfile = cfile
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}
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// read implements the Reader interface.
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pub fn (f &File) read(mut buf []u8) !int {
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if !f.is_opened || isnil(f.cfile) {
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return error_file_not_opened()
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}
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if buf.len == 0 {
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return Eof{}
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}
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// the following is needed, because on FreeBSD, C.feof is a macro:
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nbytes := int(C.fread(buf.data, 1, buf.len, unsafe { &C.FILE(f.cfile) }))
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// if no bytes were read, check for errors and end-of-file.
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if nbytes <= 0 {
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if C.feof(unsafe { &C.FILE(f.cfile) }) != 0 {
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return Eof{}
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}
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if C.ferror(unsafe { &C.FILE(f.cfile) }) != 0 {
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return NotExpected{
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cause: 'unexpected error from fread'
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code: -1
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}
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}
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}
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return nbytes
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}
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// **************************** Write ops ***************************
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// write implements the Writer interface.
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// It returns how many bytes were actually written.
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pub fn (mut f File) write(buf []u8) !int {
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if !f.is_opened || isnil(f.cfile) {
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return error_file_not_opened()
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}
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/*
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$if linux {
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$if !android {
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res := C.syscall(sys_write, f.fd, s.str, s.len)
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return res
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}
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}
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*/
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written := int(C.fwrite(buf.data, 1, buf.len, f.cfile))
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if written == 0 && buf.len != 0 {
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return error('0 bytes written')
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}
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return written
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}
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// writeln writes the string `s` into the file, and appends a \n character.
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// It returns how many bytes were written, including the \n character.
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pub fn (mut f File) writeln(s string) !int {
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if !f.is_opened {
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return error_file_not_opened()
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}
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written := f.write_string(s)!
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x := C.fputs(c'\n', f.cfile)
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if x < 0 {
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return error('could not add newline')
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}
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return written + 1
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}
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// write_string writes the string `s` into the file.
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// It returns how many bytes were actually written.
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pub fn (mut f File) write_string(s string) !int {
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unsafe { f.write_full_buffer(s.str, usize(s.len))! }
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return s.len
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}
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// write_to implements the RandomWriter interface.
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// It returns how many bytes were actually written.
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// It resets the seek position to the end of the file.
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pub fn (mut f File) write_to(pos u64, buf []u8) !int {
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if !f.is_opened {
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return error_file_not_opened()
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}
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f.seek(pos, .start) or {}
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res := int(C.fwrite(buf.data, 1, buf.len, f.cfile))
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if res == 0 && buf.len != 0 {
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return error('0 bytes written')
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}
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f.seek(0, .end) or {}
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return res
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}
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// write_ptr writes `size` bytes to the file, starting from the address in `data`.
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// Note: write_ptr is unsafe and should be used carefully, since if you pass invalid
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// pointers to it, it will cause your programs to segfault.
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@[unsafe]
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pub fn (mut f File) write_ptr(data voidptr, size int) int {
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return int(C.fwrite(data, 1, size, f.cfile))
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}
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// write_full_buffer writes a whole buffer of data to the file, starting from the
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// address in `buffer`, no matter how many tries/partial writes it would take.
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// The size in bytes, of the `buffer`, should be passed in `buffer_len`.
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@[unsafe]
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pub fn (mut f File) write_full_buffer(buffer voidptr, buffer_len usize) ! {
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if buffer_len <= usize(0) {
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return
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}
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if !f.is_opened {
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return error_file_not_opened()
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}
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mut ptr := &u8(buffer)
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mut remaining_bytes := i64(buffer_len)
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for remaining_bytes > 0 {
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unsafe {
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C.errno = 0
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x := i64(C.fwrite(ptr, 1, remaining_bytes, f.cfile))
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cerror := int(C.errno)
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ptr += x
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remaining_bytes -= x
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if cerror != 0 {
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if cerror == C.EINTR {
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continue
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}
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if i64(x) != i64(buffer_len) {
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return error(posix_get_error_msg(cerror))
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}
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}
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if x <= 0 {
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return error('C.fwrite returned 0')
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}
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}
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}
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}
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// write_ptr_at writes `size` bytes to the file, starting from the address in `data`,
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// at byte offset `pos`, counting from the start of the file (pos 0).
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// Note: write_ptr_at is unsafe and should be used carefully, since if you pass invalid
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// pointers to it, it will cause your programs to segfault.
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@[unsafe]
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pub fn (mut f File) write_ptr_at(data voidptr, size int, pos u64) int {
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f.seek(pos, .start) or {}
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res := int(C.fwrite(data, 1, size, f.cfile))
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f.seek(0, .end) or {}
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return res
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}
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// **************************** Read ops ***************************
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// fread wraps C.fread and handles error and end-of-file detection.
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fn fread(ptr voidptr, item_size int, items int, stream &C.FILE) !int {
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nbytes := int(C.fread(ptr, item_size, items, stream))
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// If no bytes were read, check for errors and end-of-file.
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if nbytes <= 0 {
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// If fread encountered end-of-file return the none error. Note that fread
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// may read data and encounter the end-of-file, but we shouldn't return none
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// in that case which is why we only check for end-of-file if no data was
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// read. The caller will get none on their next call because there will be
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// no data available and the end-of-file will be encountered again.
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if C.feof(stream) != 0 {
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return Eof{}
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}
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// If fread encountered an error, return it. Note that fread and ferror do
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// not tell us what the error was, so we can't return anything more specific
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// than there was an error. This is because fread and ferror do not set
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// errno.
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if C.ferror(stream) != 0 {
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return error('file read error')
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}
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}
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return nbytes
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}
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// read_bytes reads `size` bytes from the beginning of the file.
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// Utility method, same as .read_bytes_at(size, 0).
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pub fn (f &File) read_bytes(size int) []u8 {
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return f.read_bytes_at(size, 0)
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}
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// read_bytes_at reads `size` bytes at the given position in the file.
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pub fn (f &File) read_bytes_at(size int, pos u64) []u8 {
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mut arr := []u8{len: size}
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nreadbytes := f.read_bytes_into(pos, mut arr) or {
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// return err
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return []
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}
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return arr[0..nreadbytes]
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}
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// read_bytes_with_newline reads from the current position of the file into the provided buffer.
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// Each consecutive call on the same file, continues reading, from where it previously ended.
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// A read call is either stopped, if the buffer is full, a newline was read or EOF.
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// On EOF, the method returns 0. The methods will also return any IO error encountered.
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pub fn (f &File) read_bytes_with_newline(mut buf []u8) !int {
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if !f.is_opened {
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return error_file_not_opened()
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}
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if buf.len == 0 {
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return error(@FN + ': `buf.len` == 0')
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}
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newline := 10
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mut c := 0
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mut buf_ptr := 0
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mut nbytes := 0
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stream := unsafe { &C.FILE(f.cfile) }
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for (buf_ptr < buf.len) {
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c = C.getc(stream)
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match c {
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C.EOF {
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if C.feof(stream) != 0 {
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return nbytes
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}
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if C.ferror(stream) != 0 {
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return error('file read error')
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}
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}
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newline {
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buf[buf_ptr] = u8(c)
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nbytes++
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return nbytes
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}
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else {
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buf[buf_ptr] = u8(c)
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buf_ptr++
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nbytes++
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}
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}
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}
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return nbytes
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}
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// read_bytes_into fills `buf` with bytes at the given position in the file.
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// `buf` *must* have length greater than zero.
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// Returns the number of read bytes, or an error.
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pub fn (f &File) read_bytes_into(pos u64, mut buf []u8) !int {
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if !f.is_opened {
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return error_file_not_opened()
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}
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if buf.len == 0 {
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return error(@FN + ': `buf.len` == 0')
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}
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// Note: fseek errors if pos == os.file_size, which we accept
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unsafe { f.seek(pos, .start) or {} }
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nbytes := fread(buf.data, 1, buf.len, f.cfile)!
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return nbytes
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}
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// read_from implements the RandomReader interface.
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pub fn (f &File) read_from(pos u64, mut buf []u8) !int {
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if !f.is_opened {
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return error_file_not_opened()
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}
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if buf.len == 0 {
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return 0
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}
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unsafe { f.seek(pos, .start) or {} }
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nbytes := fread(buf.data, 1, buf.len, f.cfile)!
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return nbytes
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}
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// read_into_ptr reads at most `max_size` bytes from the file and writes it into ptr.
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// Returns the amount of bytes read or an error.
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pub fn (f &File) read_into_ptr(ptr &u8, max_size int) !int {
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if !f.is_opened {
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return error_file_not_opened()
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}
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return fread(ptr, 1, max_size, f.cfile)
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}
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||||
|
||||
// **************************** Utility ops ***********************
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||||
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// flush writes any buffered unwritten data left in the file stream.
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pub fn (mut f File) flush() {
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if !f.is_opened {
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return
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}
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C.fflush(f.cfile)
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}
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||||
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pub struct FileNotOpenedError {
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Error
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||||
}
|
||||
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||||
pub fn (err FileNotOpenedError) msg() string {
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||||
return 'os: file not opened'
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||||
}
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||||
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||||
pub struct SizeOfTypeIs0Error {
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||||
Error
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||||
}
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||||
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||||
pub fn (err SizeOfTypeIs0Error) msg() string {
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||||
return 'os: size of type is 0'
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}
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||||
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||||
fn error_file_not_opened() IError {
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||||
return &FileNotOpenedError{}
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||||
}
|
||||
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||||
fn error_size_of_type_0() IError {
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||||
return &SizeOfTypeIs0Error{}
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||||
}
|
||||
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||||
// read_struct reads a single plain-data struct of type `T`.
|
||||
// `T` must not contain strings, dynamic arrays, maps, pointers, interfaces, or function values.
|
||||
pub fn (mut f File) read_struct[T](mut t T) ! {
|
||||
if !f.is_opened {
|
||||
return error_file_not_opened()
|
||||
}
|
||||
tsize := int(sizeof(T))
|
||||
if tsize == 0 {
|
||||
return error_size_of_type_0()
|
||||
}
|
||||
nbytes := fread(voidptr(&t), 1, tsize, f.cfile)!
|
||||
if nbytes != tsize {
|
||||
return error_with_code('incomplete struct read', nbytes)
|
||||
}
|
||||
}
|
||||
|
||||
// read_struct_at reads a single plain-data struct of type `T` at position specified in file.
|
||||
// `T` must not contain strings, dynamic arrays, maps, pointers, interfaces, or function values.
|
||||
pub fn (mut f File) read_struct_at[T](mut t T, pos u64) ! {
|
||||
if !f.is_opened {
|
||||
return error_file_not_opened()
|
||||
}
|
||||
tsize := int(sizeof(T))
|
||||
if tsize == 0 {
|
||||
return error_size_of_type_0()
|
||||
}
|
||||
f.seek(pos, .start) or {}
|
||||
nbytes := fread(voidptr(&t), 1, tsize, f.cfile)!
|
||||
f.seek(0, .end) or {}
|
||||
if nbytes != tsize {
|
||||
return error_with_code('incomplete struct read', nbytes)
|
||||
}
|
||||
}
|
||||
|
||||
// read_raw reads and returns a single plain-data instance of type `T`.
|
||||
// `T` must not contain strings, dynamic arrays, maps, pointers, interfaces, or function values.
|
||||
pub fn (mut f File) read_raw[T]() !T {
|
||||
if !f.is_opened {
|
||||
return error_file_not_opened()
|
||||
}
|
||||
tsize := int(sizeof(T))
|
||||
if tsize == 0 {
|
||||
return error_size_of_type_0()
|
||||
}
|
||||
mut t := T{}
|
||||
nbytes := fread(&t, 1, tsize, f.cfile)!
|
||||
if nbytes != tsize {
|
||||
return error_with_code('incomplete struct read', nbytes)
|
||||
}
|
||||
return t
|
||||
}
|
||||
|
||||
// read_raw_at reads and returns a single plain-data instance of type `T` starting at file byte offset `pos`.
|
||||
// `T` must not contain strings, dynamic arrays, maps, pointers, interfaces, or function values.
|
||||
pub fn (mut f File) read_raw_at[T](pos u64) !T {
|
||||
if !f.is_opened {
|
||||
return error_file_not_opened()
|
||||
}
|
||||
tsize := int(sizeof(T))
|
||||
if tsize == 0 {
|
||||
return error_size_of_type_0()
|
||||
}
|
||||
mut t := T{}
|
||||
f.seek(pos, .start)!
|
||||
nbytes := fread(&t, 1, tsize, f.cfile)!
|
||||
f.seek(0, .end)!
|
||||
if nbytes != tsize {
|
||||
return error_with_code('incomplete struct read', nbytes)
|
||||
}
|
||||
return t
|
||||
}
|
||||
|
||||
// write_struct writes a single plain-data struct of type `T`.
|
||||
// `T` must not contain strings, dynamic arrays, maps, pointers, interfaces, or function values.
|
||||
pub fn (mut f File) write_struct[T](t &T) ! {
|
||||
if !f.is_opened {
|
||||
return error_file_not_opened()
|
||||
}
|
||||
tsize := int(sizeof(T))
|
||||
if tsize == 0 {
|
||||
return error_size_of_type_0()
|
||||
}
|
||||
C.errno = 0
|
||||
nbytes := int(C.fwrite(t, 1, tsize, f.cfile))
|
||||
if C.errno != 0 {
|
||||
return error(posix_get_error_msg(C.errno))
|
||||
}
|
||||
if nbytes != tsize {
|
||||
return error_with_code('incomplete struct write', nbytes)
|
||||
}
|
||||
}
|
||||
|
||||
// write_struct_at writes a single plain-data struct of type `T` at file byte offset `pos`.
|
||||
// `T` must not contain strings, dynamic arrays, maps, pointers, interfaces, or function values.
|
||||
pub fn (mut f File) write_struct_at[T](t &T, pos u64) ! {
|
||||
if !f.is_opened {
|
||||
return error_file_not_opened()
|
||||
}
|
||||
tsize := usize(sizeof(T))
|
||||
if tsize == 0 {
|
||||
return error_size_of_type_0()
|
||||
}
|
||||
f.seek(pos, .start) or {}
|
||||
unsafe { f.write_full_buffer(t, tsize)! }
|
||||
f.seek(0, .end) or {}
|
||||
}
|
||||
|
||||
// TODO: `write_raw[_at]` implementations are copy-pasted from `write_struct[_at]`
|
||||
|
||||
// write_raw writes a single plain-data instance of type `T`.
|
||||
// `T` must not contain strings, dynamic arrays, maps, pointers, interfaces, or function values.
|
||||
pub fn (mut f File) write_raw[T](t &T) ! {
|
||||
if !f.is_opened {
|
||||
return error_file_not_opened()
|
||||
}
|
||||
tsize := usize(sizeof(T))
|
||||
if tsize == 0 {
|
||||
return error_size_of_type_0()
|
||||
}
|
||||
unsafe { f.write_full_buffer(t, tsize)! }
|
||||
}
|
||||
|
||||
// write_raw_at writes a single plain-data instance of type `T` starting at file byte offset `pos`.
|
||||
// `T` must not contain strings, dynamic arrays, maps, pointers, interfaces, or function values.
|
||||
pub fn (mut f File) write_raw_at[T](t &T, pos u64) ! {
|
||||
if !f.is_opened {
|
||||
return error_file_not_opened()
|
||||
}
|
||||
tsize := usize(sizeof(T))
|
||||
if tsize == 0 {
|
||||
return error_size_of_type_0()
|
||||
}
|
||||
f.seek(pos, .start)!
|
||||
unsafe { f.write_full_buffer(t, tsize)! }
|
||||
f.seek(0, .end)!
|
||||
}
|
||||
|
||||
pub enum SeekMode {
|
||||
start
|
||||
current
|
||||
end
|
||||
}
|
||||
|
||||
// seek moves the file cursor (if any) associated with a file to a new location, offset `pos` bytes from the origin.
|
||||
// The origin is dependent on the `mode` and can be:
|
||||
// .start -> the origin is the start of the file
|
||||
// .current -> the current position/cursor in the file
|
||||
// .end -> the end of the file
|
||||
// If the file is not seek-able, or an error occurs, the error will
|
||||
// be returned to the caller.
|
||||
// A successful call to the fseek() function clears the end-of-file
|
||||
// indicator for the file.
|
||||
pub fn (mut f File) seek(pos i64, mode SeekMode) ! {
|
||||
if !f.is_opened {
|
||||
return error_file_not_opened()
|
||||
}
|
||||
whence := int(mode)
|
||||
mut res := 0
|
||||
$if x64 {
|
||||
$if windows {
|
||||
res = C._fseeki64(f.cfile, pos, whence)
|
||||
} $else {
|
||||
res = C.fseek(f.cfile, pos, whence)
|
||||
}
|
||||
}
|
||||
$if x32 {
|
||||
res = C.fseek(f.cfile, pos, whence)
|
||||
}
|
||||
if res == -1 {
|
||||
return error(posix_get_error_msg(C.errno))
|
||||
}
|
||||
}
|
||||
|
||||
// tell will return the current offset of the file cursor measured from the start of the file, in bytes.
|
||||
// It is complementary to seek, i.e. you can use the return value as the `pos` parameter to .seek( pos, .start ),
|
||||
// so that your next read will happen from the same place.
|
||||
pub fn (f &File) tell() !i64 {
|
||||
if !f.is_opened {
|
||||
return error_file_not_opened()
|
||||
}
|
||||
|
||||
mut pos := i64(0)
|
||||
mut ret := 0
|
||||
$if windows {
|
||||
ret = C.fgetpos(f.cfile, &pos)
|
||||
} $else {
|
||||
pos = i64(C.ftell(f.cfile))
|
||||
}
|
||||
if ret == -1 || pos == -1 {
|
||||
return error(posix_get_error_msg(C.errno))
|
||||
}
|
||||
return pos
|
||||
}
|
||||
Reference in new issue
Block a user