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v/vlib/os/os_nix.v
2020-02-03 04:01:39 +01:00

264 lines
4.7 KiB
V

module os
import strings
#include <dirent.h>
#include <unistd.h>
#include <fcntl.h>
pub const (
path_separator = '/'
)
const (
stdin_value = 0
stdout_value = 1
stderr_value = 2
)
fn C.symlink(charptr, charptr) int
pub fn init_os_args(argc int, argv &byteptr) []string {
mut args := []string
for i in 0 .. argc {
args << string(argv[i])
}
return args
}
pub fn ls(path string) ?[]string {
mut res := []string
dir := C.opendir(path.str)
if isnil(dir) {
return error('ls() couldnt open dir "$path"')
}
mut ent := &C.dirent(0)
// mut ent := &C.dirent{!}
for {
ent = C.readdir(dir)
if isnil(ent) {
break
}
name := tos_clone(byteptr(ent.d_name))
if name != '.' && name != '..' && name != '' {
res << name
}
}
C.closedir(dir)
return res
}
/*
pub fn is_dir(path string) bool {
//$if linux {
//C.syscall(4, path.str) // sys_newstat
//}
dir := C.opendir(path.str)
res := !isnil(dir)
if res {
C.closedir(dir)
}
return res
}
*/
// open opens a file at the specified and returns back a read-only `File` object
pub fn open(path string) ?File {
/*
$if linux {
$if !android {
fd := C.syscall(sys_open, path.str, 511)
if fd == -1 {
return error('failed to open file "$path"')
}
return File{
fd: fd
opened: true
}
}
}
*/
file := File{
cfile: C.fopen(charptr(path.str), 'rb')
opened: true
}
if isnil(file.cfile) {
return error('failed to open file "$path"')
}
return file
}
// create creates or opens a file at a specified location and returns a write-only `File` object
pub fn create(path string) ?File {
/*
// NB: android/termux/bionic is also a kind of linux,
// but linux syscalls there sometimes fail,
// while the libc version should work.
$if linux {
$if !android {
//$if macos {
// fd = C.syscall(398, path.str, 0x601, 0x1b6)
//}
//$if linux {
fd = C.syscall(sys_creat, path.str, 511)
//}
if fd == -1 {
return error('failed to create file "$path"')
}
file = File{
fd: fd
opened: true
}
return file
}
}
*/
file := File{
cfile: C.fopen(charptr(path.str), 'wb')
opened: true
}
if isnil(file.cfile) {
return error('failed to create file "$path"')
}
return file
}
/*
pub fn (f mut File) fseek(pos, mode int) {
}
*/
pub fn (f mut File) write(s string) {
if !f.opened {
return
}
/*
$if linux {
$if !android {
C.syscall(sys_write, f.fd, s.str, s.len)
return
}
}
*/
C.fputs(s.str, f.cfile)
// C.fwrite(s.str, 1, s.len, f.cfile)
}
pub fn (f mut File) writeln(s string) {
if !f.opened {
return
}
/*
$if linux {
$if !android {
snl := s + '\n'
C.syscall(sys_write, f.fd, snl.str, snl.len)
return
}
}
*/
// C.fwrite(s.str, 1, s.len, f.cfile)
// ss := s.clone()
// TODO perf
C.fputs(s.str, f.cfile)
// ss.free()
C.fputs('\n', f.cfile)
}
// mkdir creates a new directory with the specified path.
pub fn mkdir(path string) ?bool {
if path == '.' {
return true
}
apath := os.realpath(path)
/*
$if linux {
$if !android {
ret := C.syscall(sys_mkdir, apath.str, 511)
if ret == -1 {
return error(posix_get_error_msg(C.errno))
}
return true
}
}
*/
r := C.mkdir(apath.str, 511)
if r == -1 {
return error(posix_get_error_msg(C.errno))
}
return true
}
// exec starts the specified command, waits for it to complete, and returns its output.
pub fn exec(cmd string) ?Result {
// if cmd.contains(';') || cmd.contains('&&') || cmd.contains('||') || cmd.contains('\n') {
// return error(';, &&, || and \\n are not allowed in shell commands')
// }
pcmd := '$cmd 2>&1'
f := vpopen(pcmd)
if isnil(f) {
return error('exec("$cmd") failed')
}
buf := [4096]byte
mut res := strings.new_builder(1024)
for C.fgets(charptr(buf), 4096, f) != 0 {
res.write_bytes( buf, vstrlen(buf) )
}
soutput := res.str().trim_space()
res.free()
exit_code := vpclose(f)
// if exit_code != 0 {
// return error(res)
// }
return Result{
output: soutput
exit_code: exit_code
}
}
pub fn symlink(origin, target string) ?bool {
res := C.symlink(origin.str, target.str)
if res == 0 {
return true
}
return error(posix_get_error_msg(C.errno))
}
// get_error_msg return error code representation in string.
pub fn get_error_msg(code int) string {
return posix_get_error_msg(code)
}
// convert any value to []byte (LittleEndian) and write it
// for example if we have write(7, 4), "07 00 00 00" gets written
// write(0x1234, 2) => "34 12"
pub fn (f mut File) write_bytes(data voidptr, size int) {
/*
$if linux {
$if !android {
C.syscall(sys_write, f.fd, data, 1)
return
}
}
*/
C.fwrite(data, 1, size, f.cfile)
}
pub fn (f mut File) close() {
if !f.opened {
return
}
f.opened = false
/*
$if linux {
$if !android {
C.syscall(sys_close, f.fd)
return
}
}
*/
C.fflush(f.cfile)
C.fclose(f.cfile)
}