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#+private
package os
import "base:runtime"
import "core:strings"
import "core:strconv"
import "core:sys/linux"
_Path_Separator :: '/'
_Path_Separator_String :: "/"
_Path_List_Separator :: ':'
_OPENDIR_FLAGS : linux.Open_Flags : {.NONBLOCK, .DIRECTORY, .LARGEFILE, .CLOEXEC}
_is_path_separator :: proc(c: byte) -> bool {
return c == _Path_Separator
}
_mkdir :: proc(path: string, perm: int) -> Error {
temp_allocator := TEMP_ALLOCATOR_GUARD({})
path_cstr := clone_to_cstring(path, temp_allocator) or_return
return _get_platform_error(linux.mkdir(path_cstr, transmute(linux.Mode)u32(perm)))
}
_mkdir_all :: proc(path: string, perm: int) -> Error {
mkdirat :: proc(dfd: linux.Fd, path: []u8, perm: int, has_created: ^bool) -> Error {
i: int
for ; i < len(path) - 1 && path[i] != '/'; i += 1 {}
if i == 0 {
return _get_platform_error(linux.close(dfd))
}
path[i] = 0
new_dfd, errno := linux.openat(dfd, cstring(&path[0]), _OPENDIR_FLAGS)
#partial switch errno {
case .ENOENT:
if errno = linux.mkdirat(dfd, cstring(&path[0]), transmute(linux.Mode)u32(perm)); errno != .NONE {
return _get_platform_error(errno)
}
has_created^ = true
if new_dfd, errno = linux.openat(dfd, cstring(&path[0]), _OPENDIR_FLAGS); errno != .NONE {
return _get_platform_error(errno)
}
fallthrough
case .NONE:
if errno = linux.close(dfd); errno != .NONE {
return _get_platform_error(errno)
}
// skip consecutive '/'
for i += 1; i < len(path) && path[i] == '/'; i += 1 {}
return mkdirat(new_dfd, path[i:], perm, has_created)
}
return _get_platform_error(errno)
}
temp_allocator := TEMP_ALLOCATOR_GUARD({})
// need something we can edit, and use to generate cstrings
path_bytes := make([]u8, len(path) + 1, temp_allocator)
// zero terminate the byte slice to make it a valid cstring
copy(path_bytes, path)
path_bytes[len(path)] = 0
dfd: linux.Fd
errno: linux.Errno
if path_bytes[0] == '/' {
dfd, errno = linux.open("/", _OPENDIR_FLAGS)
path_bytes = path_bytes[1:]
} else {
dfd, errno = linux.open(".", _OPENDIR_FLAGS)
}
if errno != .NONE {
return _get_platform_error(errno)
}
has_created: bool
mkdirat(dfd, path_bytes, perm, &has_created) or_return
return nil if has_created else .Exist
}
_remove_all :: proc(path: string) -> Error {
remove_all_dir :: proc(dfd: linux.Fd) -> Error {
n := 64
buf := make([]u8, n)
defer delete(buf)
loop: for {
buflen, errno := linux.getdents(dfd, buf[:])
#partial switch errno {
case .EINVAL:
delete(buf)
n *= 2
buf = make([]u8, n)
continue loop
case .NONE:
if buflen == 0 { break loop }
case:
return _get_platform_error(errno)
}
offset: int
for d in linux.dirent_iterate_buf(buf[:buflen], &offset) {
d_name_str := linux.dirent_name(d)
d_name_cstr := strings.unsafe_string_to_cstring(d_name_str)
/* check for current or parent directory (. or ..) */
if d_name_str == "." || d_name_str == ".." {
continue
}
#partial switch d.type {
case .DIR:
new_dfd: linux.Fd
new_dfd, errno = linux.openat(dfd, d_name_cstr, _OPENDIR_FLAGS)
if errno != .NONE {
return _get_platform_error(errno)
}
defer linux.close(new_dfd)
remove_all_dir(new_dfd) or_return
errno = linux.unlinkat(dfd, d_name_cstr, {.REMOVEDIR})
case:
errno = linux.unlinkat(dfd, d_name_cstr, nil)
}
if errno != .NONE {
return _get_platform_error(errno)
}
}
}
return nil
}
temp_allocator := TEMP_ALLOCATOR_GUARD({})
path_cstr := clone_to_cstring(path, temp_allocator) or_return
fd, errno := linux.open(path_cstr, _OPENDIR_FLAGS)
#partial switch errno {
case .NONE:
break
case .ENOTDIR:
return _get_platform_error(linux.unlink(path_cstr))
case:
return _get_platform_error(errno)
}
defer linux.close(fd)
remove_all_dir(fd) or_return
return _get_platform_error(linux.rmdir(path_cstr))
}
_get_working_directory :: proc(allocator: runtime.Allocator) -> (string, Error) {
// NOTE(tetra): I would use PATH_MAX here, but I was not able to find
// an authoritative value for it across all systems.
// The largest value I could find was 4096, so might as well use the page size.
// NOTE(jason): Avoiding libc, so just use 4096 directly
PATH_MAX :: 4096
buf := make([dynamic]u8, PATH_MAX, allocator)
for {
#no_bounds_check n, errno := linux.getcwd(buf[:])
if errno == .NONE {
return string(buf[:n-1]), nil
}
if errno != .ERANGE {
return "", _get_platform_error(errno)
}
resize(&buf, len(buf)+PATH_MAX)
}
unreachable()
}
_set_working_directory :: proc(dir: string) -> Error {
temp_allocator := TEMP_ALLOCATOR_GUARD({})
dir_cstr := clone_to_cstring(dir, temp_allocator) or_return
return _get_platform_error(linux.chdir(dir_cstr))
}
_get_executable_path :: proc(allocator: runtime.Allocator) -> (path: string, err: Error) {
temp_allocator := TEMP_ALLOCATOR_GUARD({ allocator })
buf := make([dynamic]byte, 1024, temp_allocator) or_return
for {
n, errno := linux.readlink("/proc/self/exe", buf[:])
if errno != .NONE {
err = _get_platform_error(errno)
return
}
if n < len(buf) {
return clone_string(string(buf[:n]), allocator)
}
resize(&buf, len(buf)*2) or_return
}
}
_get_full_path :: proc(fd: linux.Fd, allocator: runtime.Allocator) -> (fullpath: string, err: Error) {
PROC_FD_PATH :: "/proc/self/fd/"
buf: [32]u8
copy(buf[:], PROC_FD_PATH)
strconv.write_int(buf[len(PROC_FD_PATH):], i64(fd), 10)
if fullpath, err = _read_link_cstr(cstring(&buf[0]), allocator); err != nil || fullpath[0] != '/' {
delete(fullpath, allocator)
fullpath = ""
}
return
}
_get_absolute_path :: proc(path: string, allocator: runtime.Allocator) -> (absolute_path: string, err: Error) {
rel := path
if rel == "" {
rel = "."
}
temp_allocator := TEMP_ALLOCATOR_GUARD({ allocator })
fd, errno := linux.open(clone_to_cstring(path, temp_allocator) or_return, {})
if errno != nil {
err = _get_platform_error(errno)
return
}
defer linux.close(fd)
return _get_full_path(fd, allocator)
}
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