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mirror of https://github.com/vlang/v.git synced 2023-08-10 21:13:21 +03:00
v/vlib/os/os.v
Alexander Medvednikov 390394b56b string: make substr() copy the data, like in Java and C#; remove .cstr()
this makes managing memory used by strings much easier
V strings are now fully compatible with C strings
2019-07-22 17:03:45 +02:00

747 lines
15 KiB
Go

// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module os
#include <sys/stat.h>
#include <signal.h>
#include <unistd.h>
#include <errno.h>
//#include <execinfo.h> // for backtrace_symbols_fd
/*
struct dirent {
d_ino int
d_off int
d_reclen u16
d_type byte
d_name [256]byte
}
*/
struct C.dirent {
d_name byteptr
}
const (
args = []string
MAX_PATH = 4096
)
// Windows
import const (
FILE_ATTRIBUTE_DIRECTORY
INVALID_FILE_ATTRIBUTES
)
struct FILE {
}
struct File {
cfile *FILE
}
struct FileInfo {
name string
size int
}
import const (
SEEK_SET
SEEK_END
SA_SIGINFO
S_IFMT
S_IFDIR
SIGABRT
SIGFPE
SIGILL
SIGINT
SIGSEGV
SIGTERM
)
struct C.stat {
st_size int
st_mode int
st_mtime int
}
struct C.DIR {
}
//struct C.dirent {
//d_name byteptr
//}
struct C.sigaction {
mut:
sa_mask int
sa_sigaction int
sa_flags int
}
fn C.getline(voidptr, voidptr, voidptr) int
fn C.ftell(fp voidptr) int
fn C.getenv(byteptr) byteptr
fn C.sigaction(int, voidptr, int)
fn todo_remove(){}
fn init_os_args(argc int, argv *byteptr) []string {
mut args := []string
for i := 0; i < argc; i++ {
args << string(argv[i])
}
return args
}
fn parse_windows_cmd_line(cmd byteptr) []string {
s := string(cmd)
return s.split(' ')
}
// read_file reads the file in `path` and returns the contents.
pub fn read_file(path string) ?string {
mut mode := 'rb'
fp := C.fopen(path.str, mode.str)
if isnil(fp) {
return error('failed to open file "$path"')
}
C.fseek(fp, 0, SEEK_END)
fsize := C.ftell(fp)
// C.fseek(fp, 0, SEEK_SET) // same as `C.rewind(fp)` below
C.rewind(fp)
mut str := malloc(fsize + 1)
C.fread(str, fsize, 1, fp)
C.fclose(fp)
str[fsize] = 0
return string(str, fsize)
}
// file_size returns the size of the file located in `path`.
pub fn file_size(path string) int {
s := C.stat{}
C.stat(path.str, &s)
return s.st_size
}
pub fn mv(old, new string) {
C.rename(old.str, new.str)
}
// read_lines reads the file in `path` into an array of lines.
// TODO return `?[]string` TODO implement `?[]` support
pub fn read_lines(path string) []string {
mut res := []string
mut buf := [1000]byte
fp := C.fopen(path.str, 'rb')
if isnil(fp) {
// TODO
// return error('failed to open file "$path"')
return res
}
for C.fgets(buf, 1000, fp) != 0 {
mut val := ''
buf[C.strlen(buf) - 1] = `\0` // eat the newline fgets() stores
$if windows {
if buf[strlen(buf)-2] == 13 {
buf[strlen(buf) - 2] = `\0`
}
}
res << tos_clone(buf)
}
C.fclose(fp)
return res
}
fn read_ulines(path string) []ustring {
lines := read_lines(path)
// mut ulines := new_array(0, lines.len, sizeof(ustring))
mut ulines := []ustring
for myline in lines {
// ulines[i] = ustr
ulines << myline.ustring()
}
return ulines
}
pub fn open(path string) ?File {
file := File {
cfile: C.fopen(path.str, 'rb')
}
if isnil(file.cfile) {
return error('failed to open file "$path"')
}
return file
}
// create creates a file at a specified location and returns a writable `File` object.
pub fn create(path string) ?File {
file := File {
cfile: C.fopen(path.str, 'wb')
}
if isnil(file.cfile) {
return error('failed to create file "$path"')
}
return file
}
pub fn open_append(path string) ?File {
file := File {
cfile: C.fopen(path.str, 'ab')
}
if isnil(file.cfile) {
return error('failed to create file "$path"')
}
return file
}
pub fn (f File) write(s string) {
ss := s.clone() // TODO is clone() needed here?
C.fputs(ss.str, f.cfile)
// ss.free()
// C.fwrite(s.str, 1, s.len, f.cfile)
}
// 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 File) write_bytes(data voidptr, size int) {
C.fwrite(data, 1, size, f.cfile)
}
pub fn (f File) write_bytes_at(data voidptr, size, pos int) {
C.fseek(f.cfile, pos, SEEK_SET)
C.fwrite(data, 1, size, f.cfile)
C.fseek(f.cfile, 0, SEEK_END)
}
pub fn (f File) writeln(s string) {
// 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)
}
pub fn (f File) flush() {
C.fflush(f.cfile)
}
pub fn (f File) close() {
C.fclose(f.cfile)
}
// system starts the specified command, waits for it to complete, and returns its code.
pub fn system(cmd string) int {
ret := C.system(cmd.str)
if ret == -1 {
os.print_c_errno()
}
return ret
}
fn popen(path string) *FILE {
cpath := path.str
$if windows {
return C._popen(cpath, 'r')
}
$else {
return C.popen(cpath, 'r')
}
}
// exec starts the specified command, waits for it to complete, and returns its output.
pub fn exec(cmd string) string {
cmd = '$cmd 2>&1'
f := popen(cmd)
if isnil(f) {
// TODO optional or error code
println('popen $cmd failed')
return ''
}
buf := [1000]byte
mut res := ''
for C.fgets(buf, 1000, f) != 0 {
res += tos(buf, strlen(buf))
}
return res.trim_space()
}
// `getenv` returns the value of the environment variable named by the key.
pub fn getenv(key string) string {
s := C.getenv(key.str)
if isnil(s) {
return ''
}
return string(s)
}
pub fn setenv(name string, value string, overwrite bool) int {
$if windows {
format := '$name=$value'
if overwrite {
return C._putenv(format.str)
}
return -1
}
$else {
return C.setenv(name.str, value.str, overwrite)
}
}
pub fn unsetenv(name string) int {
$if windows {
format := '${name}='
return C._putenv(format.str)
}
$else {
return C.unsetenv(name.str)
}
}
// `file_exists` returns true if `path` exists.
pub fn file_exists(path string) bool {
$if windows {
return C._access( path.str, 0 ) != -1
}
return C.access( path.str, 0 ) != -1
}
pub fn dir_exists(path string) bool {
$if windows {
attr := int(C.GetFileAttributes(path.str))
if attr == INVALID_FILE_ATTRIBUTES {
return false
}
if (attr & FILE_ATTRIBUTE_DIRECTORY) != 0 {
return true
}
return false
}
$else {
dir := C.opendir(path.str)
res := !isnil(dir)
if res {
C.closedir(dir)
}
return res
}
}
// mkdir creates a new directory with the specified path.
pub fn mkdir(path string) {
$if windows {
path = path.replace('/', '\\')
C.CreateDirectory(path.str, 0)
}
$else {
C.mkdir(path.str, 511)// S_IRWXU | S_IRWXG | S_IRWXO
}
}
// rm removes file in `path`.
pub fn rm(path string) {
C.remove(path.str)
// C.unlink(path.str)
}
// rmdir removes a specified directory.
pub fn rmdir(path string) {
$if !windows {
C.rmdir(path.str)
}
$else {
C.RemoveDirectoryA(path.str)
}
}
fn print_c_errno() {
//C.printf('errno=%d err="%s"\n', errno, C.strerror(errno))
}
pub fn ext(path string) string {
pos := path.last_index('.')
if pos == -1 {
return ''
}
return path.right(pos)
}
// dir returns all but the last element of path, typically the path's directory.
pub fn dir(path string) string {
mut pos := -1
// TODO PathSeparator defined in os_win.v doesn't work when building V,
// because v.c is generated for a nix system.
$if windows {
pos = path.last_index('\\')
}
$else {
pos = path.last_index(PathSeparator)
}
if pos == -1 {
return '.'
}
return path.left(pos)
}
fn path_sans_ext(path string) string {
pos := path.last_index('.')
if pos == -1 {
return path
}
return path.left(pos)
}
pub fn basedir(path string) string {
pos := path.last_index('/')
if pos == -1 {
return path
}
return path.left(pos + 1)
}
pub fn filename(path string) string {
return path.all_after('/')
}
// get_line returns a one-line string from stdin
pub fn get_line() string {
str := get_raw_line()
if str[str.len - 1] == `\n` {
return str.substr(0, str.len - 1)
}
return str
}
// get_raw_line returns a one-line string from stdin along with '\n' if there is any
pub fn get_raw_line() string {
$if windows {
max := 256
buf := malloc(max)
h_input := C.GetStdHandle(STD_INPUT_HANDLE)
if h_input == INVALID_HANDLE_VALUE {
panic('get_raw_line() error getting input handle.')
}
nr_chars := 0
// NOTE: Once we have UTF8 encode function to
// convert utf16 to utf8, change to ReadConsoleW
C.ReadConsole(h_input, buf, max, &nr_chars, 0)
if nr_chars == 0 {
return ''
}
return tos(buf, nr_chars)
}
$else {
//u64 is used because C.getline needs a size_t as second argument
//Otherwise, it would cause a valgrind warning and may be dangerous
//Malloc takes an int as argument so a cast has to be made
max := u64(256)
buf := malloc(int(max))
nr_chars := C.getline(&buf, &max, stdin)
if nr_chars == 0 {
return ''
}
return string(buf, nr_chars)
}
}
pub fn user_os() string {
$if linux {
return 'linux'
}
$if mac {
return 'mac'
}
$if windows {
return 'windows'
}
$if freebsd {
return 'freebsd'
}
$if openbsd {
return 'openbsd'
}
$if netbsd {
return 'netbsd'
}
$if dragonfly {
return 'dragonfly'
}
return 'unknown'
}
// home_dir returns path to user's home directory.
pub fn home_dir() string {
mut home := os.getenv('HOME')
$if windows {
home = os.getenv('HOMEDRIVE')
if home.len == 0 {
home = os.getenv('SYSTEMDRIVE')
}
mut homepath := os.getenv('HOMEPATH')
if homepath.len == 0 {
homepath = '\\Users\\' + os.getenv('USERNAME')
}
home += homepath
}
home += '/'
return home
}
// write_file writes `text` data to a file in `path`.
pub fn write_file(path, text string) {
f := os.create(path) or {
return
}
f.write(text)
f.close()
}
pub fn clear() {
C.printf('\x1b[2J')
C.printf('\x1b[H')
}
fn on_segfault(f voidptr) {
$if windows {
return
}
$if mac {
mut sa := C.sigaction{}
C.memset(&sa, 0, sizeof(sigaction))
C.sigemptyset(&sa.sa_mask)
sa.sa_sigaction = f
sa.sa_flags = SA_SIGINFO
C.sigaction(SIGSEGV, &sa, 0)
}
}
pub fn executable() string {
mut result := malloc(MAX_PATH)
$if linux {
count := int(C.readlink('/proc/self/exe', result, MAX_PATH ))
if count < 0 {
panic('error reading /proc/self/exe to get exe path')
}
return string(result, count)
}
$if windows {
ret := int(C.GetModuleFileName( 0, result, MAX_PATH ))
return string( result, ret)
}
$if mac {
pid := C.getpid()
ret := C.proc_pidpath (pid, result, MAX_PATH)
if ret <= 0 {
println('os.executable() failed')
return '.'
}
return string(result)
}
$if freebsd {
mut mib := [1 /* CTL_KERN */, 14 /* KERN_PROC */, 12 /* KERN_PROC_PATHNAME */, -1]!!
size := MAX_PATH
C.sysctl(mib, 4, result, &size, 0, 0)
return string(result)
}
$if openbsd {
// "Sadly there is no way to get the full path of the executed file in OpenBSD."
// lol
return os.args[0]
}
$if netbsd {
count := int(C.readlink('/proc/curproc/exe', result, MAX_PATH ))
if count < 0 {
panic('error reading /proc/curproc/exe to get exe path')
}
return string(result, count)
}
$if dragonfly {
count := int(C.readlink('/proc/curproc/file', result, MAX_PATH ))
if count < 0 {
panic('error reading /proc/curproc/file to get exe path')
}
return string(result, count)
}
return '.'
}
pub fn is_dir(path string) bool {
$if windows {
return dir_exists(path)
//val := int(C.GetFileAttributes(path.to_wide()))
// Note: this return is broke (wrong). we have dir_exists already how will this differ?
//return (val &FILE_ATTRIBUTE_DIRECTORY) > 0
}
$else {
statbuf := C.stat{}
cstr := path.str
if C.stat(cstr, &statbuf) != 0 {
return false
}
return statbuf.st_mode & S_IFMT == S_IFDIR
}
}
pub fn chdir(path string) {
$if windows {
C._chdir(path.str)
}
$else {
C.chdir(path.str)
}
}
pub fn getwd() string {
buf := malloc(512)
$if windows {
if C._getcwd(buf, 512) == 0 {
return ''
}
}
$else {
if C.getcwd(buf, 512) == 0 {
return ''
}
}
return string(buf)
}
// win: FILETIME
// https://docs.microsoft.com/en-us/windows/win32/api/minwinbase/ns-minwinbase-filetime
struct filetime {
dwLowDateTime u32
dwHighDateTime u32
}
// win: WIN32_FIND_DATA
// https://docs.microsoft.com/en-us/windows/win32/api/minwinbase/ns-minwinbase-_win32_find_dataa
struct win32finddata {
mut:
dwFileAttributes u32
ftCreationTime filetime
ftLastAccessTime filetime
ftLastWriteTime filetime
nFileSizeHigh u32
nFileSizeLow u32
dwReserved0 u32
dwReserved1 u32
cFileName [260]u16 // MAX_PATH = 260
cAlternateFileName [14]u16 // 14
dwFileType u32
dwCreatorType u32
wFinderFlags u16
}
pub fn ls(path string) []string {
$if windows {
mut find_file_data := win32finddata{}
mut dir_files := []string
// We can also check if the handle is valid. but using dir_exists instead
// h_find_dir := C.FindFirstFile(path.str, &find_file_data)
// if (INVALID_HANDLE_VALUE == h_find_dir) {
// return dir_files
// }
// C.FindClose(h_find_dir)
if !dir_exists(path) {
println('ls() couldnt open dir "$path" (does not exist).')
return dir_files
}
// NOTE: Should eventually have path struct & os dependant path seperator (eg os.PATH_SEPERATOR)
// we need to add files to path eg. c:\windows\*.dll or :\windows\*
path_files := '$path\\*'
// NOTE:TODO: once we have a way to convert utf16 wide character to utf8
// we should use FindFirstFileW and FindNextFileW
h_find_files := C.FindFirstFile(path_files.str, &find_file_data)
first_filename := tos(&find_file_data.cFileName, strlen(find_file_data.cFileName))
if first_filename != '.' && first_filename != '..' {
dir_files << first_filename
}
for C.FindNextFile(h_find_files, &find_file_data) {
filename := tos(&find_file_data.cFileName, strlen(find_file_data.cFileName))
if filename != '.' && filename != '..' {
dir_files << filename.clone()
}
}
C.FindClose(h_find_files)
return dir_files
}
$else {
mut res := []string
dir := C.opendir(path.str)
if isnil(dir) {
println('ls() couldnt open dir "$path"')
print_c_errno()
return res
}
mut ent := &C.dirent{!}
for {
ent = C.readdir(dir)
if isnil(ent) {
break
}
name := tos_clone(ent.d_name)
if name != '.' && name != '..' && name != '' {
res << name
}
}
C.closedir(dir)
return res
}
}
pub fn signal(signum int, handler voidptr) {
C.signal(signum, handler)
}
pub fn fork() int {
$if !windows {
pid := C.fork()
return pid
}
}
pub fn wait() int {
$if !windows {
pid := C.wait(0)
return pid
}
}
pub fn file_last_mod_unix(path string) int {
attr := C.stat{}
//# struct stat attr;
C.stat(path.str, &attr)
//# stat(path.str, &attr);
return attr.st_mtime
//# return attr.st_mtime ;
}
fn log(s string) {
}
pub fn print_backtrace() {
/*
# void *buffer[100];
nptrs := 0
# nptrs = backtrace(buffer, 100);
# printf("%d!!\n", nptrs);
# backtrace_symbols_fd(buffer, nptrs, STDOUT_FILENO) ;
*/
}