mirror/v
1
0
Fork 0
mirror of https://github.com/vlang/v.git synced 2023-08-10 21:13:21 +03:00
Code Issues Projects Releases Wiki Activity

vlib: add a new module builtin.wchar, to ease dealing with C APIs that accept wchar_t* (#18794)

Browse Source
This commit is contained in:
Delyan Angelov
2023-07-07 02:40:11 +03:00
committed by GitHub
parent de392003be
commit ded6c38061
5 changed files with 167 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
vlib/builtin/utf8.c.v
View File

@@ -10,6 +10,8 @@ const cp_utf8 = 65001
// The returned pointer of .to_wide(), has a type of &u16, and is suitable
// for passing to Windows APIs that expect LPWSTR or wchar_t* parameters.
// See also MultiByteToWideChar ( https://learn.microsoft.com/en-us/windows/win32/api/stringapiset/nf-stringapiset-multibytetowidechar )
// See also builtin.wchar.from_string/1, for a version, that produces a
// platform dependant L"" C style wchar_t* wide string.
pub fn (_str string) to_wide() &u16 {
$if windows {
unsafe {
@@ -29,19 +31,25 @@ pub fn (_str string) to_wide() &u16 {
for i, r in srunes {
result[i] = u16(r)
}
result[srunes.len] = 0
return result
}
}
}
// string_from_wide creates a V string, encoded in UTF-8, given a windows
// style string encoded in UTF-16.
// style string encoded in UTF-16. Note that this function first searches
// for the string terminator 0 character, and is thus slower, while more
// convenient compared to string_from_wide2/2 (you have to know the length
// in advance to use string_from_wide2/2).
// See also builtin.wchar.to_string/1, for a version that eases working with
// the platform dependent &wchar_t L"" strings.
[manualfree; unsafe]
pub fn string_from_wide(_wstr &u16) string {
$if windows {
unsafe {
wstr_len := C.wcslen(_wstr)
return string_from_wide2(_wstr, wstr_len)
return string_from_wide2(_wstr, int(wstr_len))
}
} $else {
mut i := 0
@@ -56,6 +64,8 @@ pub fn string_from_wide(_wstr &u16) string {
// style string, encoded in UTF-16. It is more efficient, compared to
// string_from_wide, but it requires you to know the input string length,
// and to pass it as the second argument.
// See also builtin.wchar.to_string2/2, for a version that eases working
// with the platform dependent &wchar_t L"" strings.
[manualfree; unsafe]
pub fn string_from_wide2(_wstr &u16, len int) string {
$if windows {