2 use std::convert::TryFrom;
3 use std::ffi::{OsStr, OsString};
5 use std::path::{Path, PathBuf};
8 use std::os::unix::ffi::{OsStrExt, OsStringExt};
10 use std::os::windows::ffi::{OsStrExt, OsStringExt};
12 use rustc_middle::ty::layout::LayoutOf;
13 use rustc_target::abi::{Align, Size};
17 /// Represent how path separator conversion should be done.
18 pub enum PathConversion {
24 pub fn os_str_to_bytes<'a, 'tcx>(os_str: &'a OsStr) -> InterpResult<'tcx, &'a [u8]> {
29 pub fn os_str_to_bytes<'a, 'tcx>(os_str: &'a OsStr) -> InterpResult<'tcx, &'a [u8]> {
30 // On non-unix platforms the best we can do to transform bytes from/to OS strings is to do the
31 // intermediate transformation into strings. Which invalidates non-utf8 paths that are actually
35 .map(|s| s.as_bytes())
36 .ok_or_else(|| err_unsup_format!("{:?} is not a valid utf-8 string", os_str).into())
40 pub fn bytes_to_os_str<'a, 'tcx>(bytes: &'a [u8]) -> InterpResult<'tcx, &'a OsStr> {
41 Ok(OsStr::from_bytes(bytes))
44 pub fn bytes_to_os_str<'a, 'tcx>(bytes: &'a [u8]) -> InterpResult<'tcx, &'a OsStr> {
45 let s = std::str::from_utf8(bytes)
46 .map_err(|_| err_unsup_format!("{:?} is not a valid utf-8 string", bytes))?;
50 impl<'mir, 'tcx: 'mir> EvalContextExt<'mir, 'tcx> for crate::MiriEvalContext<'mir, 'tcx> {}
51 pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx> {
52 /// Helper function to read an OsString from a null-terminated sequence of bytes, which is what
53 /// the Unix APIs usually handle.
54 fn read_os_str_from_c_str<'a>(
56 ptr: Pointer<Option<Tag>>,
57 ) -> InterpResult<'tcx, &'a OsStr>
62 let this = self.eval_context_ref();
63 let bytes = this.read_c_str(ptr)?;
64 bytes_to_os_str(bytes)
67 /// Helper function to read an OsString from a 0x0000-terminated sequence of u16,
68 /// which is what the Windows APIs usually handle.
69 fn read_os_str_from_wide_str<'a>(
71 ptr: Pointer<Option<Tag>>,
72 ) -> InterpResult<'tcx, OsString>
78 pub fn u16vec_to_osstring<'tcx, 'a>(u16_vec: Vec<u16>) -> InterpResult<'tcx, OsString> {
79 Ok(OsString::from_wide(&u16_vec[..]))
82 pub fn u16vec_to_osstring<'tcx, 'a>(u16_vec: Vec<u16>) -> InterpResult<'tcx, OsString> {
83 let s = String::from_utf16(&u16_vec[..])
84 .map_err(|_| err_unsup_format!("{:?} is not a valid utf-16 string", u16_vec))?;
88 let u16_vec = self.eval_context_ref().read_wide_str(ptr)?;
89 u16vec_to_osstring(u16_vec)
92 /// Helper function to write an OsStr as a null-terminated sequence of bytes, which is what
93 /// the Unix APIs usually handle. This function returns `Ok((false, length))` without trying
94 /// to write if `size` is not large enough to fit the contents of `os_string` plus a null
95 /// terminator. It returns `Ok((true, length))` if the writing process was successful. The
96 /// string length returned does not include the null terminator.
97 fn write_os_str_to_c_str(
100 ptr: Pointer<Option<Tag>>,
102 ) -> InterpResult<'tcx, (bool, u64)> {
103 let bytes = os_str_to_bytes(os_str)?;
104 // If `size` is smaller or equal than `bytes.len()`, writing `bytes` plus the required null
105 // terminator to memory using the `ptr` pointer would cause an out-of-bounds access.
106 let string_length = u64::try_from(bytes.len()).unwrap();
107 if size <= string_length {
108 return Ok((false, string_length));
110 self.eval_context_mut()
112 .write_bytes(ptr, bytes.iter().copied().chain(iter::once(0u8)))?;
113 Ok((true, string_length))
116 /// Helper function to write an OsStr as a 0x0000-terminated u16-sequence, which is what
117 /// the Windows APIs usually handle. This function returns `Ok((false, length))` without trying
118 /// to write if `size` is not large enough to fit the contents of `os_string` plus a null
119 /// terminator. It returns `Ok((true, length))` if the writing process was successful. The
120 /// string length returned does not include the null terminator.
121 fn write_os_str_to_wide_str(
124 ptr: Pointer<Option<Tag>>,
126 ) -> InterpResult<'tcx, (bool, u64)> {
128 fn os_str_to_u16vec<'tcx>(os_str: &OsStr) -> InterpResult<'tcx, Vec<u16>> {
129 Ok(os_str.encode_wide().collect())
132 fn os_str_to_u16vec<'tcx>(os_str: &OsStr) -> InterpResult<'tcx, Vec<u16>> {
133 // On non-Windows platforms the best we can do to transform Vec<u16> from/to OS strings is to do the
134 // intermediate transformation into strings. Which invalidates non-utf8 paths that are actually
138 .map(|s| s.encode_utf16().collect())
139 .ok_or_else(|| err_unsup_format!("{:?} is not a valid utf-8 string", os_str).into())
142 let u16_vec = os_str_to_u16vec(os_str)?;
143 // If `size` is smaller or equal than `bytes.len()`, writing `bytes` plus the required
144 // 0x0000 terminator to memory would cause an out-of-bounds access.
145 let string_length = u64::try_from(u16_vec.len()).unwrap();
146 let string_length = string_length.checked_add(1).unwrap();
147 if size < string_length {
148 return Ok((false, string_length));
151 // Store the UTF-16 string.
152 let size2 = Size::from_bytes(2);
153 let this = self.eval_context_mut();
156 .get_mut(ptr, size2 * string_length, Align::from_bytes(2).unwrap())?
157 .unwrap(); // not a ZST, so we will get a result
158 for (offset, wchar) in u16_vec.into_iter().chain(iter::once(0x0000)).enumerate() {
159 let offset = u64::try_from(offset).unwrap();
161 .write_scalar(alloc_range(size2 * offset, size2), Scalar::from_u16(wchar).into())?;
163 Ok((true, string_length - 1))
166 /// Allocate enough memory to store the given `OsStr` as a null-terminated sequence of bytes.
167 fn alloc_os_str_as_c_str(
170 memkind: MemoryKind<MiriMemoryKind>,
171 ) -> InterpResult<'tcx, Pointer<Option<Tag>>> {
172 let size = u64::try_from(os_str.len()).unwrap().checked_add(1).unwrap(); // Make space for `0` terminator.
173 let this = self.eval_context_mut();
175 let arg_type = this.tcx.mk_array(this.tcx.types.u8, size);
176 let arg_place = this.allocate(this.layout_of(arg_type).unwrap(), memkind)?;
177 assert!(self.write_os_str_to_c_str(os_str, arg_place.ptr, size).unwrap().0);
181 /// Allocate enough memory to store the given `OsStr` as a null-terminated sequence of `u16`.
182 fn alloc_os_str_as_wide_str(
185 memkind: MemoryKind<MiriMemoryKind>,
186 ) -> InterpResult<'tcx, Pointer<Option<Tag>>> {
187 let size = u64::try_from(os_str.len()).unwrap().checked_add(1).unwrap(); // Make space for `0x0000` terminator.
188 let this = self.eval_context_mut();
190 let arg_type = this.tcx.mk_array(this.tcx.types.u16, size);
191 let arg_place = this.allocate(this.layout_of(arg_type).unwrap(), memkind)?;
192 assert!(self.write_os_str_to_wide_str(os_str, arg_place.ptr, size).unwrap().0);
196 /// Read a null-terminated sequence of bytes, and perform path separator conversion if needed.
197 fn read_path_from_c_str<'a>(
199 ptr: Pointer<Option<Tag>>,
200 ) -> InterpResult<'tcx, Cow<'a, Path>>
205 let this = self.eval_context_ref();
206 let os_str = this.read_os_str_from_c_str(ptr)?;
208 Ok(match this.convert_path_separator(Cow::Borrowed(os_str), PathConversion::TargetToHost) {
209 Cow::Borrowed(x) => Cow::Borrowed(Path::new(x)),
210 Cow::Owned(y) => Cow::Owned(PathBuf::from(y)),
214 /// Read a null-terminated sequence of `u16`s, and perform path separator conversion if needed.
215 fn read_path_from_wide_str(&self, ptr: Pointer<Option<Tag>>) -> InterpResult<'tcx, PathBuf> {
216 let this = self.eval_context_ref();
217 let os_str = this.read_os_str_from_wide_str(ptr)?;
220 .convert_path_separator(Cow::Owned(os_str), PathConversion::TargetToHost)
225 /// Write a Path to the machine memory (as a null-terminated sequence of bytes),
226 /// adjusting path separators if needed.
227 fn write_path_to_c_str(
230 ptr: Pointer<Option<Tag>>,
232 ) -> InterpResult<'tcx, (bool, u64)> {
233 let this = self.eval_context_mut();
235 .convert_path_separator(Cow::Borrowed(path.as_os_str()), PathConversion::HostToTarget);
236 this.write_os_str_to_c_str(&os_str, ptr, size)
239 /// Write a Path to the machine memory (as a null-terminated sequence of `u16`s),
240 /// adjusting path separators if needed.
241 fn write_path_to_wide_str(
244 ptr: Pointer<Option<Tag>>,
246 ) -> InterpResult<'tcx, (bool, u64)> {
247 let this = self.eval_context_mut();
249 .convert_path_separator(Cow::Borrowed(path.as_os_str()), PathConversion::HostToTarget);
250 this.write_os_str_to_wide_str(&os_str, ptr, size)
253 fn convert_path_separator<'a>(
255 os_str: Cow<'a, OsStr>,
256 direction: PathConversion,
257 ) -> Cow<'a, OsStr> {
258 let this = self.eval_context_ref();
259 let target_os = &this.tcx.sess.target.os;
261 return if target_os == "windows" {
262 // Windows-on-Windows, all fine.
265 // Unix target, Windows host.
266 let (from, to) = match direction {
267 PathConversion::HostToTarget => ('\\', '/'),
268 PathConversion::TargetToHost => ('/', '\\'),
270 let converted = os_str
272 .map(|wchar| if wchar == from as u16 { to as u16 } else { wchar })
273 .collect::<Vec<_>>();
274 Cow::Owned(OsString::from_wide(&converted))
277 return if target_os == "windows" {
278 // Windows target, Unix host.
279 let (from, to) = match direction {
280 PathConversion::HostToTarget => ('/', '\\'),
281 PathConversion::TargetToHost => ('\\', '/'),
283 let converted = os_str
286 .map(|&wchar| if wchar == from as u8 { to as u8 } else { wchar })
287 .collect::<Vec<_>>();
288 Cow::Owned(OsString::from_vec(converted))
290 // Unix-on-Unix, all is fine.