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[core] _WIN32 fs_win32_readlinkUTF8() (#3223) 

x-ref:
  "Add readlink to lighty.c.* library functions"
  https://redmine.lighttpd.net/issues/3223
This commit is contained in:
Glenn Strauss 2023-09-12 01:22:48 -04:00
parent b0369b0dbd
commit eb0a2f9a7d
2 changed files with 45 additions and 0 deletions
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41
src/fs_win32.c
View File

@ -64,4 +64,45 @@ int fs_win32_stati64UTF8 (const char *path, struct fs_win32_stati64UTF8 *st)
return 0;
}
int fs_win32_readlinkUTF8 (const char *path, char *result, size_t rsz)
{
WCHAR wbuf[4096];
int wlen = MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, path, -1,
wbuf, sizeof(wbuf)/sizeof(*wbuf));
if (0 == wlen) {
errno = (GetLastError() == ERROR_INSUFFICIENT_BUFFER) ? ENOSPC : EINVAL;
return -1;
}
HANDLE h = CreateFileW(wbuf,0,0,0,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,0);
DWORD rd = (h != INVALID_HANDLE_VALUE) /*(reuse wbuf for result)*/
? GetFinalPathNameByHandleW(h, wbuf, sizeof(wbuf)/sizeof(*wbuf),
FILE_NAME_NORMALIZED | VOLUME_NAME_NT)
: 0;
CloseHandle(h);
if (0 == rd) {
errno = (GetLastError() == ERROR_PATH_NOT_FOUND) ? ENOENT : EINVAL;
return -1;
}
if (rd >= sizeof(wbuf)/sizeof(*wbuf) || 0 == rsz) {
errno = ENOSPC;
return -1;
}
int mlen =
#if 0 /*(???: should we strip "\\?\" from result?)*/
(StrCmpNW(wbuf, L"\\\\?\\", 4) == 0)
? WideCharToMultiByte(CP_UTF8, WC_ERR_INVALID_CHARS,
wbuf+4, rd-4, result, rsz-1, NULL, NULL);
:
#endif
WideCharToMultiByte(CP_UTF8, WC_ERR_INVALID_CHARS,
wbuf, rd, result, rsz-1, NULL, NULL);
if (0 == mlen) {
errno = (GetLastError() == ERROR_INSUFFICIENT_BUFFER) ? ENOSPC : EINVAL;
return -1;
}
/*(???: should we translate '\\' to '/' in result?)*/
result[mlen] = '\0';
return mlen;
}
#endif /* _WIN32 */

4
src/fs_win32.h
View File

@ -65,6 +65,10 @@ struct fs_win32_stati64UTF8 {
/* could be inline compat func here, but fairly large func */
int fs_win32_stati64UTF8 (const char *path, struct fs_win32_stati64UTF8 *st);
#undef readlink
#define readlink(a,b,c) fs_win32_readlinkUTF8((a),(b),(c))
int fs_win32_readlinkUTF8 (const char *path, char *result, size_t rsz);
#endif /* _WIN32 */
#endif