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Copy pathos.c.v
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1115 lines (1047 loc) · 30.2 KB
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module os
import strings
#include <sys/stat.h> // #include <signal.h>
#include <errno.h>
pub const (
args = []string{}
)
fn C.readdir(voidptr) &C.dirent
fn C.readlink(pathname &char, buf &char, bufsiz usize) int
fn C.getline(voidptr, voidptr, voidptr) int
fn C.sigaction(int, voidptr, int) int
fn C.open(&char, int, ...int) int
fn C.fdopen(fd int, mode &char) &C.FILE
fn C.ferror(stream &C.FILE) int
fn C.feof(stream &C.FILE) int
fn C.CopyFile(&u16, &u16, bool) int
// fn C.lstat(charptr, voidptr) u64
fn C._wstat64(&u16, voidptr) u64
fn C.chown(&char, int, int) int
fn C.ftruncate(voidptr, u64) int
fn C._chsize_s(voidptr, u64) int
// read_bytes returns all bytes read from file in `path`.
[manualfree]
pub fn read_bytes(path string) ![]u8 {
mut fp := vfopen(path, 'rb')!
defer {
C.fclose(fp)
}
fsize := find_cfile_size(fp)!
if fsize == 0 {
mut sb := slurp_file_in_builder(fp)!
return unsafe { sb.reuse_as_plain_u8_array() }
}
mut res := []u8{len: fsize}
nr_read_elements := int(C.fread(res.data, 1, fsize, fp))
if nr_read_elements == 0 && fsize > 0 {
return error('fread failed')
}
res.trim(nr_read_elements)
return res
}
fn find_cfile_size(fp &C.FILE) !int {
// NB: Musl's fseek returns -1 for virtual files, while Glibc's fseek returns 0
cseek := C.fseek(fp, 0, C.SEEK_END)
raw_fsize := C.ftell(fp)
if raw_fsize != 0 && cseek != 0 {
return error('fseek failed')
}
if cseek != 0 && raw_fsize < 0 {
return error('ftell failed')
}
len := int(raw_fsize)
// For files > 2GB, C.ftell can return values that, when cast to `int`, can result in values below 0.
if i64(len) < raw_fsize {
return error('int(${raw_fsize}) cast results in ${len}')
}
C.rewind(fp)
return len
}
const buf_size = 4096
// slurp_file_in_builder reads an entire file into a strings.Builder chunk by chunk, without relying on its file size.
// It is intended for reading 0 sized files, or a dynamic files in a virtual filesystem like /proc/cpuinfo.
// For these, we can not allocate all memory in advance (since we do not know the final size), and so we have no choice
// but to read the file in `buf_size` chunks.
[manualfree]
fn slurp_file_in_builder(fp &C.FILE) !strings.Builder {
buf := [os.buf_size]u8{}
mut sb := strings.new_builder(os.buf_size)
for {
mut read_bytes := fread(&buf[0], 1, os.buf_size, fp) or {
if err is Eof {
break
}
unsafe { sb.free() }
return err
}
unsafe { sb.write_ptr(&buf[0], read_bytes) }
}
return sb
}
// read_file reads the file in `path` and returns the contents.
[manualfree]
pub fn read_file(path string) !string {
mode := 'rb'
mut fp := vfopen(path, mode)!
defer {
C.fclose(fp)
}
allocate := find_cfile_size(fp)!
if allocate == 0 {
mut sb := slurp_file_in_builder(fp)!
res := sb.str()
unsafe { sb.free() }
return res
}
unsafe {
mut str := malloc_noscan(allocate + 1)
nelements := int(C.fread(str, 1, allocate, fp))
is_eof := int(C.feof(fp))
is_error := int(C.ferror(fp))
if is_eof == 0 && is_error != 0 {
free(str)
return error('fread failed')
}
str[nelements] = 0
if nelements == 0 {
// It is highly likely that the file was a virtual file from
// /sys or /proc, with information generated on the fly, so
// fsize was not reliably reported. Using vstring() here is
// slower (it calls strlen internally), but will return more
// consistent results.
// For example reading from /sys/class/sound/card0/id produces
// a `PCH\n` string, but fsize is 4096, and otherwise you would
// get a V string with .len = 4096 and .str = "PCH\n\\000".
return str.vstring()
}
return str.vstring_with_len(nelements)
}
}
// ***************************** OS ops ************************
//
// truncate changes the size of the file located in `path` to `len`.
// Note that changing symbolic links on Windows only works as admin.
pub fn truncate(path string, len u64) ! {
fp := C.open(&char(path.str), o_wronly | o_trunc, 0)
defer {
C.close(fp)
}
if fp < 0 {
return error_with_code(posix_get_error_msg(C.errno), C.errno)
}
$if windows {
if C._chsize_s(fp, len) != 0 {
return error_with_code(posix_get_error_msg(C.errno), C.errno)
}
} $else {
if C.ftruncate(fp, len) != 0 {
return error_with_code(posix_get_error_msg(C.errno), C.errno)
}
}
}
fn eprintln_unknown_file_size() {
eprintln('os.file_size() Cannot determine file-size: ' + posix_get_error_msg(C.errno))
}
// file_size returns the size of the file located in `path`.
// If an error occurs it returns 0.
// Note that use of this on symbolic links on Windows returns always 0.
pub fn file_size(path string) u64 {
mut s := C.stat{}
unsafe {
$if x64 {
$if windows {
mut swin := C.__stat64{}
if C._wstat64(path.to_wide(), voidptr(&swin)) != 0 {
eprintln_unknown_file_size()
return 0
}
return swin.st_size
} $else {
if C.stat(&char(path.str), &s) != 0 {
eprintln_unknown_file_size()
return 0
}
return u64(s.st_size)
}
}
$if x32 {
$if debug {
eprintln('Using os.file_size() on 32bit systems may not work on big files.')
}
$if windows {
if C._wstat(path.to_wide(), voidptr(&s)) != 0 {
eprintln_unknown_file_size()
return 0
}
return u64(s.st_size)
} $else {
if C.stat(&char(path.str), &s) != 0 {
eprintln_unknown_file_size()
return 0
}
return u64(s.st_size)
}
}
}
return 0
}
// rename_dir renames the folder from `src` to `dst`.
// Use mv to move or rename a file in a platform independent manner.
pub fn rename_dir(src string, dst string) ! {
$if windows {
w_src := src.replace('/', '\\')
w_dst := dst.replace('/', '\\')
ret := C._wrename(w_src.to_wide(), w_dst.to_wide())
if ret != 0 {
return error_with_code('failed to rename ${src} to ${dst}', int(ret))
}
} $else {
ret := C.rename(&char(src.str), &char(dst.str))
if ret != 0 {
return error_with_code('failed to rename ${src} to ${dst}', ret)
}
}
}
// rename renames the file or folder from `src` to `dst`.
// Use mv to move or rename a file in a platform independent manner.
pub fn rename(src string, dst string) ! {
mut rdst := dst
if is_dir(rdst) {
rdst = join_path_single(rdst.trim_right(path_separator), file_name(src.trim_right(path_separator)))
}
$if windows {
w_src := src.replace('/', '\\')
w_dst := rdst.replace('/', '\\')
ret := C._wrename(w_src.to_wide(), w_dst.to_wide())
if ret != 0 {
return error_with_code('failed to rename ${src} to ${dst}', int(ret))
}
} $else {
ret := C.rename(&char(src.str), &char(rdst.str))
if ret != 0 {
return error_with_code('failed to rename ${src} to ${dst}', ret)
}
}
}
// cp copies files or folders from `src` to `dst`.
pub fn cp(src string, dst string) ! {
$if windows {
w_src := src.replace('/', '\\')
w_dst := dst.replace('/', '\\')
if C.CopyFile(w_src.to_wide(), w_dst.to_wide(), false) == 0 {
result := C.GetLastError()
return error_with_code('failed to copy ${src} to ${dst}', int(result))
}
} $else {
fp_from := C.open(&char(src.str), C.O_RDONLY, 0)
if fp_from < 0 { // Check if file opened
return error_with_code('cp: failed to open ${src}', int(fp_from))
}
fp_to := C.open(&char(dst.str), C.O_WRONLY | C.O_CREAT | C.O_TRUNC, C.S_IWUSR | C.S_IRUSR)
if fp_to < 0 { // Check if file opened (permissions problems ...)
C.close(fp_from)
return error_with_code('cp (permission): failed to write to ${dst} (fp_to: ${fp_to})',
int(fp_to))
}
// TODO use defer{} to close files in case of error or return.
// Currently there is a C-Error when building.
mut buf := [1024]u8{}
mut count := 0
for {
count = C.read(fp_from, &buf[0], sizeof(buf))
if count == 0 {
break
}
if C.write(fp_to, &buf[0], count) < 0 {
C.close(fp_to)
C.close(fp_from)
return error_with_code('cp: failed to write to ${dst}', int(-1))
}
}
from_attr := C.stat{}
unsafe {
C.stat(&char(src.str), &from_attr)
}
if C.chmod(&char(dst.str), from_attr.st_mode) < 0 {
C.close(fp_to)
C.close(fp_from)
return error_with_code('failed to set permissions for ${dst}', int(-1))
}
C.close(fp_to)
C.close(fp_from)
}
}
// vfopen returns an opened C file, given its path and open mode.
// Note: os.vfopen is useful for compatibility with C libraries, that expect `FILE *`.
// If you write pure V code, os.create or os.open are more convenient.
pub fn vfopen(path string, mode string) !&C.FILE {
if path.len == 0 {
return error('vfopen called with ""')
}
mut fp := unsafe { nil }
$if windows {
fp = C._wfopen(path.to_wide(), mode.to_wide())
} $else {
fp = C.fopen(&char(path.str), &char(mode.str))
}
if isnil(fp) {
return error('failed to open file "${path}"')
} else {
return fp
}
}
// fileno returns the file descriptor of an opened C file.
pub fn fileno(cfile voidptr) int {
$if windows {
return C._fileno(cfile)
} $else {
mut cfile_casted := &C.FILE(0) // FILE* cfile_casted = 0;
cfile_casted = cfile
// Required on FreeBSD/OpenBSD/NetBSD as stdio.h defines fileno(..) with a macro
// that performs a field access on its argument without casting from void*.
return C.fileno(cfile_casted)
}
}
// vpopen system starts the specified command, waits for it to complete, and returns its code.
fn vpopen(path string) voidptr {
// *C.FILE {
$if windows {
mode := 'rb'
wpath := path.to_wide()
return C._wpopen(wpath, mode.to_wide())
} $else {
cpath := path.str
return C.popen(&char(cpath), c'r')
}
}
fn posix_wait4_to_exit_status(waitret int) (int, bool) {
$if windows {
return waitret, false
} $else {
mut ret := 0
mut is_signaled := true
// (see man system, man 2 waitpid: C macro WEXITSTATUS section)
if C.WIFEXITED(waitret) {
ret = C.WEXITSTATUS(waitret)
is_signaled = false
} else if C.WIFSIGNALED(waitret) {
ret = C.WTERMSIG(waitret)
is_signaled = true
}
return ret, is_signaled
}
}
// posix_get_error_msg return error code representation in string.
pub fn posix_get_error_msg(code int) string {
ptr_text := C.strerror(code) // voidptr?
if ptr_text == 0 {
return ''
}
return unsafe { tos3(ptr_text) }
}
// vpclose will close a file pointer opened with `vpopen`.
fn vpclose(f voidptr) int {
$if windows {
return C._pclose(f)
} $else {
ret, _ := posix_wait4_to_exit_status(C.pclose(f))
return ret
}
}
// system works like `exec`, but only returns a return code.
pub fn system(cmd string) int {
// if cmd.contains(';') || cmd.contains('&&') || cmd.contains('||') || cmd.contains('\n') {
// TODO remove panic
// panic(';, &&, || and \\n are not allowed in shell commands')
// }
mut ret := 0
$if windows {
// overcome bug in system & _wsystem (cmd) when first char is quote `"`
wcmd := if cmd.len > 1 && cmd[0] == `"` && cmd[1] != `"` { '"${cmd}"' } else { cmd }
unsafe {
ret = C._wsystem(wcmd.to_wide())
}
} $else {
$if ios {
unsafe {
arg := [c'/bin/sh', c'-c', &u8(cmd.str), 0]
pid := 0
ret = C.posix_spawn(&pid, c'/bin/sh', 0, 0, arg.data, 0)
status := 0
ret = C.waitpid(pid, &status, 0)
if C.WIFEXITED(status) {
ret = C.WEXITSTATUS(status)
}
}
} $else {
unsafe {
ret = C.system(&char(cmd.str))
}
}
}
if ret == -1 {
print_c_errno()
}
$if !windows {
pret, is_signaled := posix_wait4_to_exit_status(ret)
if is_signaled {
println('Terminated by signal ${ret:2d} (' + sigint_to_signal_name(pret) + ')')
}
ret = pret
}
return ret
}
// exists returns true if `path` (file or directory) exists.
pub fn exists(path string) bool {
$if windows {
p := path.replace('/', '\\')
return C._waccess(p.to_wide(), f_ok) != -1
} $else {
return C.access(&char(path.str), f_ok) != -1
}
}
// is_executable returns `true` if `path` is executable.
// Warning: `is_executable()` is known to cause a TOCTOU vulnerability when used incorrectly
// (for more information: https://github.com/vlang/v/blob/master/vlib/os/README.md)
pub fn is_executable(path string) bool {
$if windows {
// Note: https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/access-waccess?view=vs-2019
// i.e. there is no X bit there, the modes can be:
// 00 Existence only
// 02 Write-only
// 04 Read-only
// 06 Read and write
p := real_path(path)
return exists(p) && (p.ends_with('.exe') || p.ends_with('.bat') || p.ends_with('.cmd'))
}
$if solaris {
statbuf := C.stat{}
unsafe {
if C.stat(&char(path.str), &statbuf) != 0 {
return false
}
}
return (int(statbuf.st_mode) & (s_ixusr | s_ixgrp | s_ixoth)) != 0
}
return C.access(&char(path.str), x_ok) != -1
}
// is_writable returns `true` if `path` is writable.
// Warning: `is_writable()` is known to cause a TOCTOU vulnerability when used incorrectly
// (for more information: https://github.com/vlang/v/blob/master/vlib/os/README.md)
[manualfree]
pub fn is_writable(path string) bool {
$if windows {
p := path.replace('/', '\\')
wp := p.to_wide()
res := C._waccess(wp, w_ok) != -1
unsafe { free(wp) } // &u16
unsafe { p.free() }
return res
} $else {
return C.access(&char(path.str), w_ok) != -1
}
}
// is_readable returns `true` if `path` is readable.
// Warning: `is_readable()` is known to cause a TOCTOU vulnerability when used incorrectly
// (for more information: https://github.com/vlang/v/blob/master/vlib/os/README.md)
[manualfree]
pub fn is_readable(path string) bool {
$if windows {
p := path.replace('/', '\\')
wp := p.to_wide()
res := C._waccess(wp, r_ok) != -1
unsafe { free(wp) } // &u16
unsafe { p.free() }
return res
} $else {
return C.access(&char(path.str), r_ok) != -1
}
}
// rm removes file in `path`.
pub fn rm(path string) ! {
mut rc := 0
$if windows {
rc = C._wremove(path.to_wide())
} $else {
rc = C.remove(&char(path.str))
}
if rc == -1 {
return error('Failed to remove "${path}": ' + posix_get_error_msg(C.errno))
}
// C.unlink(path.cstr())
}
// rmdir removes a specified directory.
pub fn rmdir(path string) ! {
$if windows {
rc := C.RemoveDirectory(path.to_wide())
if !rc {
// https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-removedirectorya - 0 == false, is failure
return error('Failed to remove "${path}": ' + posix_get_error_msg(C.errno))
}
} $else {
rc := C.rmdir(&char(path.str))
if rc == -1 {
return error(posix_get_error_msg(C.errno))
}
}
}
// print_c_errno will print the current value of `C.errno`.
fn print_c_errno() {
e := C.errno
se := unsafe { tos_clone(&u8(C.strerror(e))) }
println('errno=${e} err=${se}')
}
// 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 {
unsafe {
max_line_chars := 256
buf := malloc_noscan(max_line_chars * 2)
h_input := C.GetStdHandle(C.STD_INPUT_HANDLE)
mut bytes_read := u32(0)
if is_atty(0) > 0 {
x := C.ReadConsole(h_input, buf, max_line_chars * 2, &bytes_read, 0)
if !x {
return tos(buf, 0)
}
return string_from_wide2(&u16(buf), int(bytes_read))
}
mut offset := 0
for {
pos := buf + offset
res := C.ReadFile(h_input, pos, 1, C.LPDWORD(&bytes_read), 0)
if !res && offset == 0 {
return tos(buf, 0)
}
if !res || bytes_read == 0 {
break
}
if *pos == `\n` {
offset++
break
}
offset++
}
return buf.vstring_with_len(offset)
}
} $else {
max := usize(0)
buf := &char(0)
nr_chars := unsafe { C.getline(&buf, &max, C.stdin) }
str := unsafe { tos(&u8(buf), if nr_chars < 0 { 0 } else { nr_chars }) }
ret := str.clone()
unsafe {
if nr_chars > 0 && buf != 0 {
C.free(buf)
}
}
return ret
}
}
// get_raw_stdin will get the raw input from stdin.
pub fn get_raw_stdin() []u8 {
$if windows {
unsafe {
block_bytes := 512
mut old_size := block_bytes
mut buf := malloc_noscan(block_bytes)
h_input := C.GetStdHandle(C.STD_INPUT_HANDLE)
mut bytes_read := 0
mut offset := 0
for {
pos := buf + offset
res := C.ReadFile(h_input, pos, block_bytes, C.LPDWORD(&bytes_read), 0)
offset += bytes_read
if !res {
break
}
new_size := offset + block_bytes + (block_bytes - bytes_read)
buf = realloc_data(buf, old_size, new_size)
old_size = new_size
}
return array{
element_size: 1
data: voidptr(buf)
len: offset
cap: offset
}
}
} $else {
max := usize(0)
buf := &char(0)
nr_chars := unsafe { C.getline(&buf, &max, C.stdin) }
return array{
element_size: 1
data: voidptr(buf)
len: if nr_chars < 0 { 0 } else { nr_chars }
cap: int(max)
}
}
}
// read_file_array reads an array of `T` values from file `path`.
pub fn read_file_array[T](path string) []T {
a := T{}
tsize := int(sizeof(a))
// prepare for reading, get current file size
mut fp := vfopen(path, 'rb') or { return []T{} }
C.fseek(fp, 0, C.SEEK_END)
fsize := C.ftell(fp)
C.rewind(fp)
// read the actual data from the file
len := fsize / tsize
allocate := int(fsize)
// On some systems C.ftell can return values in the 64-bit range
// that, when cast to `int`, can result in values below 0.
if i64(allocate) < fsize {
panic('${fsize} cast to int results in ${int(fsize)})')
}
buf := unsafe {
malloc_noscan(allocate)
}
nread := C.fread(buf, tsize, len, fp)
C.fclose(fp)
return unsafe {
array{
element_size: tsize
data: buf
len: int(nread)
cap: int(len)
}
}
}
// executable returns the path name of the executable that started the current
// process.
[manualfree]
pub fn executable() string {
mut result := [max_path_buffer_size]u8{}
$if windows {
pu16_result := unsafe { &u16(&result[0]) }
len := C.GetModuleFileName(0, pu16_result, 512)
// determine if the file is a windows symlink
attrs := C.GetFileAttributesW(pu16_result)
is_set := attrs & 0x400 // FILE_ATTRIBUTE_REPARSE_POINT
if is_set != 0 { // it's a windows symlink
// gets handle with GENERIC_READ, FILE_SHARE_READ, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0
file := C.CreateFile(pu16_result, 0x80000000, 1, 0, 3, 0x80, 0)
if file != voidptr(-1) {
defer {
C.CloseHandle(file)
}
final_path := [max_path_buffer_size]u8{}
// https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-getfinalpathnamebyhandlew
final_len := C.GetFinalPathNameByHandleW(file, unsafe { &u16(&final_path[0]) },
max_path_buffer_size, 0)
if final_len < u32(max_path_buffer_size) {
sret := unsafe { string_from_wide2(&u16(&final_path[0]), int(final_len)) }
defer {
unsafe { sret.free() }
}
// remove '\\?\' from beginning (see link above)
sret_slice := sret[4..]
res := sret_slice.clone()
return res
} else {
eprintln('os.executable() saw that the executable file path was too long')
}
}
}
res := unsafe { string_from_wide2(pu16_result, int(len)) }
return res
}
$if macos {
pid := C.getpid()
ret := proc_pidpath(pid, &result[0], max_path_len)
if ret <= 0 {
eprintln('os.executable() failed at calling proc_pidpath with pid: ${pid} . proc_pidpath returned ${ret} ')
return executable_fallback()
}
res := unsafe { tos_clone(&result[0]) }
return res
}
$if freebsd {
bufsize := usize(max_path_buffer_size)
mib := [1 /* CTL_KERN */, 14 /* KERN_PROC */, 12 /* KERN_PROC_PATHNAME */, -1]
unsafe { C.sysctl(mib.data, mib.len, &result[0], &bufsize, 0, 0) }
res := unsafe { tos_clone(&result[0]) }
return res
}
$if netbsd {
count := C.readlink(c'/proc/curproc/exe', &char(&result[0]), max_path_len)
if count < 0 {
eprintln('os.executable() failed at reading /proc/curproc/exe to get exe path')
return executable_fallback()
}
res := unsafe { tos_clone(&result[0]) }
return res
}
$if dragonfly {
count := C.readlink(c'/proc/curproc/file', &char(&result[0]), max_path_len)
if count < 0 {
eprintln('os.executable() failed at reading /proc/curproc/file to get exe path')
return executable_fallback()
}
res := unsafe { tos_clone(&result[0]) }
return res
}
$if linux {
count := C.readlink(c'/proc/self/exe', &char(&result[0]), max_path_len)
if count < 0 {
eprintln('os.executable() failed at reading /proc/self/exe to get exe path')
return executable_fallback()
}
res := unsafe { tos_clone(&result[0]) }
return res
}
// "Sadly there is no way to get the full path of the executed file in OpenBSD."
$if openbsd {
}
$if solaris {
}
$if haiku {
}
return executable_fallback()
}
// is_dir returns a `bool` indicating whether the given `path` is a directory.
pub fn is_dir(path string) bool {
$if windows {
w_path := path.replace('/', '\\')
attr := C.GetFileAttributesW(w_path.to_wide())
if attr == u32(C.INVALID_FILE_ATTRIBUTES) {
return false
}
if int(attr) & C.FILE_ATTRIBUTE_DIRECTORY != 0 {
return true
}
return false
} $else {
statbuf := C.stat{}
if unsafe { C.stat(&char(path.str), &statbuf) } != 0 {
return false
}
// ref: https://code.woboq.org/gcc/include/sys/stat.h.html
val := int(statbuf.st_mode) & s_ifmt
return val == s_ifdir
}
}
// is_link returns a boolean indicating whether `path` is a link.
// Warning: `is_link()` is known to cause a TOCTOU vulnerability when used incorrectly
// (for more information: https://github.com/vlang/v/blob/master/vlib/os/README.md)
pub fn is_link(path string) bool {
$if windows {
path_ := path.replace('/', '\\')
attr := C.GetFileAttributesW(path_.to_wide())
return int(attr) != int(C.INVALID_FILE_ATTRIBUTES) && (attr & 0x400) != 0
} $else {
statbuf := C.stat{}
if C.lstat(&char(path.str), &statbuf) != 0 {
return false
}
return int(statbuf.st_mode) & s_ifmt == s_iflnk
}
}
struct PathKind {
mut:
is_dir bool
is_link bool
}
fn kind_of_existing_path(path string) PathKind {
mut res := PathKind{}
$if windows {
attr := C.GetFileAttributesW(path.to_wide())
if attr != u32(C.INVALID_FILE_ATTRIBUTES) {
if (int(attr) & C.FILE_ATTRIBUTE_DIRECTORY) != 0 {
res.is_dir = true
}
if (int(attr) & 0x400) != 0 {
res.is_link = true
}
}
} $else {
statbuf := C.stat{}
// ref: https://code.woboq.org/gcc/include/sys/stat.h.html
res_stat := unsafe { C.lstat(&char(path.str), &statbuf) }
if res_stat == 0 {
kind := (int(statbuf.st_mode) & s_ifmt)
if kind == s_ifdir {
res.is_dir = true
}
if kind == s_iflnk {
res.is_link = true
}
}
}
return res
}
// chdir changes the current working directory to the new directory in `path`.
pub fn chdir(path string) ! {
ret := $if windows { C._wchdir(path.to_wide()) } $else { C.chdir(&char(path.str)) }
if ret == -1 {
return error_with_code(posix_get_error_msg(C.errno), C.errno)
}
}
// getwd returns the absolute path of the current directory.
[manualfree]
pub fn getwd() string {
unsafe {
buf := [max_path_buffer_size]u8{}
$if windows {
if C._wgetcwd(&u16(&buf[0]), max_path_len) == 0 {
return ''
}
res := string_from_wide(&u16(&buf[0]))
return res
} $else {
if C.getcwd(&char(&buf[0]), max_path_len) == 0 {
return ''
}
res := tos_clone(&buf[0])
return res
}
}
}
// real_path returns the full absolute path for fpath, with all relative ../../, symlinks and so on resolved.
// See http://pubs.opengroup.org/onlinepubs/9699919799/functions/realpath.html
// Also https://insanecoding.blogspot.com/2007/11/pathmax-simply-isnt.html
// and https://insanecoding.blogspot.com/2007/11/implementing-realpath-in-c.html
// Note: this particular rabbit hole is *deep* ...
[manualfree]
pub fn real_path(fpath string) string {
mut fullpath := [max_path_buffer_size]u8{}
mut res := ''
$if windows {
pu16_fullpath := unsafe { &u16(&fullpath[0]) }
// gets handle with GENERIC_READ, FILE_SHARE_READ, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0
// use C.CreateFile(fpath.to_wide(), 0x80000000, 1, 0, 3, 0x80, 0) instead of get_file_handle
// try to open the file to get symbolic link path
fpath_wide := fpath.to_wide()
defer {
unsafe { free(voidptr(fpath_wide)) }
}
file := C.CreateFile(fpath_wide, 0x80000000, 1, 0, 3, 0x80, 0)
if file != voidptr(-1) {
defer {
C.CloseHandle(file)
}
// https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-getfinalpathnamebyhandlew
final_len := C.GetFinalPathNameByHandleW(file, pu16_fullpath, max_path_buffer_size,
0)
if final_len < u32(max_path_buffer_size) {
rt := unsafe { string_from_wide2(pu16_fullpath, int(final_len)) }
srt := rt[4..]
unsafe { res.free() }
res = srt.clone()
} else {
eprintln('os.real_path() saw that the file path was too long')
unsafe { res.free() }
return fpath.clone()
}
} else {
// if it is not a file C.CreateFile doesn't gets a file handle, use GetFullPath instead
ret := C.GetFullPathName(fpath_wide, max_path_len, pu16_fullpath, 0)
if ret == 0 {
// TODO: check errors if path len is not enough
unsafe { res.free() }
return fpath.clone()
}
unsafe { res.free() }
res = unsafe { string_from_wide(pu16_fullpath) }
}
} $else {
ret := &char(C.realpath(&char(fpath.str), &char(&fullpath[0])))
if ret == 0 {
unsafe { res.free() }
return fpath.clone()
}
// Note: fullpath is much larger (usually ~4KB), than what C.realpath will
// actually fill in the vast majority of the cases => it pays to copy the
// resulting string from that buffer, to a shorter one, and then free the
// 4KB fullpath buffer.
unsafe { res.free() }
res = unsafe { tos_clone(&fullpath[0]) }
}
unsafe { normalize_drive_letter(res) }
return res
}
[direct_array_access; manualfree; unsafe]
fn normalize_drive_letter(path string) {
$if !windows {
return
}
// normalize_drive_letter is needed, because
// a path like c:\nv\.bin (note the small `c`) in %PATH,
// is NOT recognized by cmd.exe (and probably other programs too)...
// Capital drive letters do work fine.
if path.len > 2 && path[0] >= `a` && path[0] <= `z` && path[1] == `:`
&& path[2] == path_separator[0] {
unsafe {
x := &path.str[0]
(*x) = *x - 32
}
}
}
// fork will fork the current system process and return the pid of the fork.
pub fn fork() int {
mut pid := -1
$if !windows {
pid = C.fork()
}
$if windows {
panic('os.fork not supported in windows') // TODO
}
return pid
}
// wait blocks the calling process until one of its child processes exits or a signal is received.
// After child process terminates, parent continues its execution after wait system call instruction.
pub fn wait() int {
mut pid := -1
$if !windows {
$if !emscripten ? {
pid = C.wait(0)
}
}
$if windows {
panic('os.wait not supported in windows') // TODO
}
return pid
}
// file_last_mod_unix returns the "last modified" time stamp of file in `path`.
pub fn file_last_mod_unix(path string) i64 {
attr := C.stat{}
// # struct stat attr;
unsafe { C.stat(&char(path.str), &attr) }
// # stat(path.str, &attr);
return i64(attr.st_mtime)
// # return attr.st_mtime ;
}
// flush will flush the stdout buffer.
pub fn flush() {
C.fflush(C.stdout)
}
// chmod change file access attributes of `path` to `mode`.
// Octals like `0o600` can be used.
pub fn chmod(path string, mode int) ! {
if C.chmod(&char(path.str), mode) != 0 {
return error_with_code('chmod failed: ' + posix_get_error_msg(C.errno), C.errno)
}
}
// chown changes the owner and group attributes of `path` to `owner` and `group`.
pub fn chown(path string, owner int, group int) ! {
$if windows {
return error('os.chown() not implemented for Windows')
} $else {
if C.chown(&char(path.str), owner, group) != 0 {
return error_with_code(posix_get_error_msg(C.errno), C.errno)
}
}
}
// open_append opens `path` file for appending.
pub fn open_append(path string) !File {
mut file := File{}