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wine-wine/dlls/kernelbase/path.c

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/*
* Copyright 2018 Nikolay Sivov
* Copyright 2018 Zhiyi Zhang
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <stdarg.h>
#include "windef.h"
#include "winbase.h"
#include "pathcch.h"
#include "strsafe.h"
#include "wine/debug.h"
#include "wine/unicode.h"
WINE_DEFAULT_DEBUG_CHANNEL(path);
static SIZE_T strnlenW(const WCHAR *string, SIZE_T maxlen)
{
SIZE_T i;
for (i = 0; i < maxlen; i++)
if (!string[i]) break;
return i;
}
static BOOL is_prefixed_unc(const WCHAR *string)
{
static const WCHAR prefixed_unc[] = {'\\', '\\', '?', '\\', 'U', 'N', 'C', '\\'};
return !strncmpiW(string, prefixed_unc, ARRAY_SIZE(prefixed_unc));
}
static BOOL is_prefixed_disk(const WCHAR *string)
{
static const WCHAR prefix[] = {'\\', '\\', '?', '\\'};
return !strncmpW(string, prefix, ARRAY_SIZE(prefix)) && isalphaW(string[4]) && string[5] == ':';
}
static BOOL is_prefixed_volume(const WCHAR *string)
{
static const WCHAR prefixed_volume[] = {'\\', '\\', '?', '\\', 'V', 'o', 'l', 'u', 'm', 'e'};
const WCHAR *guid;
INT i = 0;
if (strncmpiW(string, prefixed_volume, ARRAY_SIZE(prefixed_volume))) return FALSE;
guid = string + ARRAY_SIZE(prefixed_volume);
while (i <= 37)
{
switch (i)
{
case 0:
if (guid[i] != '{') return FALSE;
break;
case 9:
case 14:
case 19:
case 24:
if (guid[i] != '-') return FALSE;
break;
case 37:
if (guid[i] != '}') return FALSE;
break;
default:
if (!isalnumW(guid[i])) return FALSE;
break;
}
i++;
}
return TRUE;
}
/* Get the next character beyond end of the segment.
Return TRUE if the last segment ends with a backslash */
static BOOL get_next_segment(const WCHAR *next, const WCHAR **next_segment)
{
while (*next && *next != '\\') next++;
if (*next == '\\')
{
*next_segment = next + 1;
return TRUE;
}
else
{
*next_segment = next;
return FALSE;
}
}
/* Find the last character of the root in a path, if there is one, without any segments */
static const WCHAR *get_root_end(const WCHAR *path)
{
/* Find path root */
if (is_prefixed_volume(path))
return path[48] == '\\' ? path + 48 : path + 47;
else if (is_prefixed_unc(path))
return path + 7;
else if (is_prefixed_disk(path))
return path[6] == '\\' ? path + 6 : path + 5;
/* \\ */
else if (path[0] == '\\' && path[1] == '\\')
return path + 1;
/* \ */
else if (path[0] == '\\')
return path;
/* X:\ */
else if (isalphaW(path[0]) && path[1] == ':')
return path[2] == '\\' ? path + 2 : path + 1;
else
return NULL;
}
HRESULT WINAPI PathAllocCanonicalize(const WCHAR *path_in, DWORD flags, WCHAR **path_out)
{
WCHAR *buffer, *dst;
const WCHAR *src;
const WCHAR *root_end;
SIZE_T buffer_size, length;
TRACE("%s %#x %p\n", debugstr_w(path_in), flags, path_out);
if (!path_in || !path_out
|| ((flags & PATHCCH_FORCE_ENABLE_LONG_NAME_PROCESS) && (flags & PATHCCH_FORCE_DISABLE_LONG_NAME_PROCESS))
|| (flags & (PATHCCH_FORCE_ENABLE_LONG_NAME_PROCESS | PATHCCH_FORCE_DISABLE_LONG_NAME_PROCESS)
&& !(flags & PATHCCH_ALLOW_LONG_PATHS))
|| ((flags & PATHCCH_ENSURE_IS_EXTENDED_LENGTH_PATH) && (flags & PATHCCH_ALLOW_LONG_PATHS)))
{
if (path_out) *path_out = NULL;
return E_INVALIDARG;
}
length = strlenW(path_in);
if ((length + 1 > MAX_PATH && !(flags & (PATHCCH_ALLOW_LONG_PATHS | PATHCCH_ENSURE_IS_EXTENDED_LENGTH_PATH)))
|| (length + 1 > PATHCCH_MAX_CCH))
{
*path_out = NULL;
return HRESULT_FROM_WIN32(ERROR_FILENAME_EXCED_RANGE);
}
/* PATHCCH_ENSURE_IS_EXTENDED_LENGTH_PATH implies PATHCCH_DO_NOT_NORMALIZE_SEGMENTS */
if (flags & PATHCCH_ENSURE_IS_EXTENDED_LENGTH_PATH) flags |= PATHCCH_DO_NOT_NORMALIZE_SEGMENTS;
/* path length + possible \\?\ addition + possible \ addition + NUL */
buffer_size = (length + 6) * sizeof(WCHAR);
buffer = LocalAlloc(LMEM_ZEROINIT, buffer_size);
if (!buffer)
{
*path_out = NULL;
return E_OUTOFMEMORY;
}
src = path_in;
dst = buffer;
root_end = get_root_end(path_in);
if (root_end) root_end = buffer + (root_end - path_in);
/* Copy path root */
if (root_end)
{
memcpy(dst, src, (root_end - buffer + 1) * sizeof(WCHAR));
src += root_end - buffer + 1;
if(PathCchStripPrefix(dst, length + 6) == S_OK)
{
/* Fill in \ in X:\ if the \ is missing */
if(isalphaW(dst[0]) && dst[1] == ':' && dst[2]!= '\\')
{
dst[2] = '\\';
dst[3] = 0;
}
dst = buffer + strlenW(buffer);
root_end = dst;
}
else
dst += root_end - buffer + 1;
}
while (*src)
{
if (src[0] == '.')
{
if (src[1] == '.')
{
/* Keep one . after * */
if (dst > buffer && dst[-1] == '*')
{
*dst++ = *src++;
continue;
}
/* Keep the .. if not surrounded by \ */
if ((src[2] != '\\' && src[2]) || (dst > buffer && dst[-1] != '\\'))
{
*dst++ = *src++;
*dst++ = *src++;
continue;
}
/* Remove the \ before .. if the \ is not part of root */
if (dst > buffer && dst[-1] == '\\' && (!root_end || dst - 1 > root_end))
{
*--dst = '\0';
/* Remove characters until a \ is encountered */
while (dst > buffer)
{
if (dst[-1] == '\\')
{
*--dst = 0;
break;
}
else
*--dst = 0;
}
}
/* Remove the extra \ after .. if the \ before .. wasn't deleted */
else if (src[2] == '\\')
src++;
src += 2;
}
else
{
/* Keep the . if not surrounded by \ */
if ((src[1] != '\\' && src[1]) || (dst > buffer && dst[-1] != '\\'))
{
*dst++ = *src++;
continue;
}
/* Remove the \ before . if the \ is not part of root */
if (dst > buffer && dst[-1] == '\\' && (!root_end || dst - 1 > root_end)) dst--;
/* Remove the extra \ after . if the \ before . wasn't deleted */
else if (src[1] == '\\')
src++;
src++;
}
/* If X:\ is not complete, then complete it */
if (isalphaW(buffer[0]) && buffer[1] == ':' && buffer[2] != '\\')
{
root_end = buffer + 2;
dst = buffer + 3;
buffer[2] = '\\';
/* If next character is \, use the \ to fill in */
if (src[0] == '\\') src++;
}
}
/* Copy over */
else
*dst++ = *src++;
}
/* End the path */
*dst = 0;
/* Strip multiple trailing . */
if (!(flags & PATHCCH_DO_NOT_NORMALIZE_SEGMENTS))
{
while (dst > buffer && dst[-1] == '.')
{
/* Keep a . after * */
if (dst - 1 > buffer && dst[-2] == '*')
break;
/* If . follow a : at the second character, remove the . and add a \ */
else if (dst - 1 > buffer && dst[-2] == ':' && dst - 2 == buffer + 1)
*--dst = '\\';
else
*--dst = 0;
}
}
/* If result path is empty, fill in \ */
if (!*buffer)
{
buffer[0] = '\\';
buffer[1] = 0;
}
/* Extend the path if needed */
length = strlenW(buffer);
if (((length + 1 > MAX_PATH && isalphaW(buffer[0]) && buffer[1] == ':')
|| (isalphaW(buffer[0]) && buffer[1] == ':' && flags & PATHCCH_ENSURE_IS_EXTENDED_LENGTH_PATH))
&& !(flags & PATHCCH_FORCE_ENABLE_LONG_NAME_PROCESS))
{
memmove(buffer + 4, buffer, (length + 1) * sizeof(WCHAR));
buffer[0] = '\\';
buffer[1] = '\\';
buffer[2] = '?';
buffer[3] = '\\';
}
/* Add a trailing backslash to the path if needed */
if (flags & PATHCCH_ENSURE_TRAILING_SLASH)
PathCchAddBackslash(buffer, buffer_size);
*path_out = buffer;
return S_OK;
}
HRESULT WINAPI PathAllocCombine(const WCHAR *path1, const WCHAR *path2, DWORD flags, WCHAR **out)
{
SIZE_T combined_length, length2;
WCHAR *combined_path;
BOOL from_path2 = FALSE;
HRESULT hr;
TRACE("%s %s %#x %p\n", wine_dbgstr_w(path1), wine_dbgstr_w(path2), flags, out);
if ((!path1 && !path2) || !out)
{
if (out) *out = NULL;
return E_INVALIDARG;
}
if (!path1 || !path2) return PathAllocCanonicalize(path1 ? path1 : path2, flags, out);
/* If path2 is fully qualified, use path2 only */
if (path2 && ((isalphaW(path2[0]) && path2[1] == ':') || (path2[0] == '\\' && path2[1] == '\\')))
{
path1 = path2;
path2 = NULL;
from_path2 = TRUE;
}
length2 = path2 ? strlenW(path2) : 0;
/* path1 length + path2 length + possible backslash + NULL */
combined_length = strlenW(path1) + length2 + 2;
combined_path = HeapAlloc(GetProcessHeap(), 0, combined_length * sizeof(WCHAR));
if (!combined_path)
{
*out = NULL;
return E_OUTOFMEMORY;
}
lstrcpyW(combined_path, path1);
PathCchStripPrefix(combined_path, combined_length);
if (from_path2) PathCchAddBackslashEx(combined_path, combined_length, NULL, NULL);
if (path2 && path2[0])
{
if (path2[0] == '\\' && path2[1] != '\\')
{
PathCchStripToRoot(combined_path, combined_length);
path2++;
}
PathCchAddBackslashEx(combined_path, combined_length, NULL, NULL);
lstrcatW(combined_path, path2);
}
hr = PathAllocCanonicalize(combined_path, flags, out);
HeapFree(GetProcessHeap(), 0, combined_path);
return hr;
}
HRESULT WINAPI PathCchAddBackslash(WCHAR *path, SIZE_T size)
{
return PathCchAddBackslashEx(path, size, NULL, NULL);
}
HRESULT WINAPI PathCchAddBackslashEx(WCHAR *path, SIZE_T size, WCHAR **endptr, SIZE_T *remaining)
{
BOOL needs_termination;
SIZE_T length;
TRACE("%s, %lu, %p, %p\n", debugstr_w(path), size, endptr, remaining);
length = strlenW(path);
needs_termination = size && length && path[length - 1] != '\\';
if (length >= (needs_termination ? size - 1 : size))
{
if (endptr) *endptr = NULL;
if (remaining) *remaining = 0;
return STRSAFE_E_INSUFFICIENT_BUFFER;
}
if (!needs_termination)
{
if (endptr) *endptr = path + length;
if (remaining) *remaining = size - length;
return S_FALSE;
}
path[length++] = '\\';
path[length] = 0;
if (endptr) *endptr = path + length;
if (remaining) *remaining = size - length;
return S_OK;
}
HRESULT WINAPI PathCchAddExtension(WCHAR *path, SIZE_T size, const WCHAR *extension)
{
const WCHAR *existing_extension, *next;
SIZE_T path_length, extension_length, dot_length;
BOOL has_dot;
HRESULT hr;
TRACE("%s %lu %s\n", wine_dbgstr_w(path), size, wine_dbgstr_w(extension));
if (!path || !size || size > PATHCCH_MAX_CCH || !extension) return E_INVALIDARG;
next = extension;
while (*next)
{
if ((*next == '.' && next > extension) || *next == ' ' || *next == '\\') return E_INVALIDARG;
next++;
}
has_dot = extension[0] == '.' ? TRUE : FALSE;
hr = PathCchFindExtension(path, size, &existing_extension);
if (FAILED(hr)) return hr;
if (*existing_extension) return S_FALSE;
path_length = strnlenW(path, size);
dot_length = has_dot ? 0 : 1;
extension_length = strlenW(extension);
if (path_length + dot_length + extension_length + 1 > size) return STRSAFE_E_INSUFFICIENT_BUFFER;
/* If extension is empty or only dot, return S_OK with path unchanged */
if (!extension[0] || (extension[0] == '.' && !extension[1])) return S_OK;
if (!has_dot)
{
path[path_length] = '.';
path_length++;
}
strcpyW(path + path_length, extension);
return S_OK;
}
HRESULT WINAPI PathCchAppend(WCHAR *path1, SIZE_T size, const WCHAR *path2)
{
TRACE("%s %lu %s\n", wine_dbgstr_w(path1), size, wine_dbgstr_w(path2));
return PathCchAppendEx(path1, size, path2, PATHCCH_NONE);
}
HRESULT WINAPI PathCchAppendEx(WCHAR *path1, SIZE_T size, const WCHAR *path2, DWORD flags)
{
HRESULT hr;
WCHAR *result;
TRACE("%s %lu %s %#x\n", wine_dbgstr_w(path1), size, wine_dbgstr_w(path2), flags);
if (!path1 || !size) return E_INVALIDARG;
/* Create a temporary buffer for result because we need to keep path1 unchanged if error occurs.
* And PathCchCombineEx writes empty result if there is error so we can't just use path1 as output
* buffer for PathCchCombineEx */
result = HeapAlloc(GetProcessHeap(), 0, size * sizeof(WCHAR));
if (!result) return E_OUTOFMEMORY;
/* Avoid the single backslash behavior with PathCchCombineEx when appending */
if (path2 && path2[0] == '\\' && path2[1] != '\\') path2++;
hr = PathCchCombineEx(result, size, path1, path2, flags);
if (SUCCEEDED(hr)) memcpy(path1, result, size * sizeof(WCHAR));
HeapFree(GetProcessHeap(), 0, result);
return hr;
}
HRESULT WINAPI PathCchCanonicalize(WCHAR *out, SIZE_T size, const WCHAR *in)
{
TRACE("%p %lu %s\n", out, size, wine_dbgstr_w(in));
/* Not X:\ and path > MAX_PATH - 4, return HRESULT_FROM_WIN32(ERROR_FILENAME_EXCED_RANGE) */
if (strlenW(in) > MAX_PATH - 4 && !(isalphaW(in[0]) && in[1] == ':' && in[2] == '\\'))
return HRESULT_FROM_WIN32(ERROR_FILENAME_EXCED_RANGE);
return PathCchCanonicalizeEx(out, size, in, PATHCCH_NONE);
}
HRESULT WINAPI PathCchCanonicalizeEx(WCHAR *out, SIZE_T size, const WCHAR *in, DWORD flags)
{
WCHAR *buffer;
SIZE_T length;
HRESULT hr;
TRACE("%p %lu %s %#x\n", out, size, wine_dbgstr_w(in), flags);
if (!size) return E_INVALIDARG;
hr = PathAllocCanonicalize(in, flags, &buffer);
if (FAILED(hr)) return hr;
length = strlenW(buffer);
if (size < length + 1)
{
/* No root and path > MAX_PATH - 4, return HRESULT_FROM_WIN32(ERROR_FILENAME_EXCED_RANGE) */
if (length > MAX_PATH - 4 && !(in[0] == '\\' || (isalphaW(in[0]) && in[1] == ':' && in[2] == '\\')))
hr = HRESULT_FROM_WIN32(ERROR_FILENAME_EXCED_RANGE);
else
hr = STRSAFE_E_INSUFFICIENT_BUFFER;
}
if (SUCCEEDED(hr))
{
memcpy(out, buffer, (length + 1) * sizeof(WCHAR));
/* Fill a backslash at the end of X: */
if (isalphaW(out[0]) && out[1] == ':' && !out[2] && size > 3)
{
out[2] = '\\';
out[3] = 0;
}
}
LocalFree(buffer);
return hr;
}
HRESULT WINAPI PathCchCombine(WCHAR *out, SIZE_T size, const WCHAR *path1, const WCHAR *path2)
{
TRACE("%p %s %s\n", out, wine_dbgstr_w(path1), wine_dbgstr_w(path2));
return PathCchCombineEx(out, size, path1, path2, PATHCCH_NONE);
}
HRESULT WINAPI PathCchCombineEx(WCHAR *out, SIZE_T size, const WCHAR *path1, const WCHAR *path2, DWORD flags)
{
HRESULT hr;
WCHAR *buffer;
SIZE_T length;
TRACE("%p %s %s %#x\n", out, wine_dbgstr_w(path1), wine_dbgstr_w(path2), flags);
if (!out || !size || size > PATHCCH_MAX_CCH) return E_INVALIDARG;
hr = PathAllocCombine(path1, path2, flags, &buffer);
if (FAILED(hr))
{
out[0] = 0;
return hr;
}
length = strlenW(buffer);
if (length + 1 > size)
{
out[0] = 0;
LocalFree(buffer);
return STRSAFE_E_INSUFFICIENT_BUFFER;
}
else
{
memcpy(out, buffer, (length + 1) * sizeof(WCHAR));
LocalFree(buffer);
return S_OK;
}
}
HRESULT WINAPI PathCchFindExtension(const WCHAR *path, SIZE_T size, const WCHAR **extension)
{
const WCHAR *lastpoint = NULL;
SIZE_T counter = 0;
TRACE("%s %lu %p\n", wine_dbgstr_w(path), size, extension);
if (!path || !size || size > PATHCCH_MAX_CCH)
{
*extension = NULL;
return E_INVALIDARG;
}
while (*path)
{
if (*path == '\\' || *path == ' ')
lastpoint = NULL;
else if (*path == '.')
lastpoint = path;
path++;
counter++;
if (counter == size || counter == PATHCCH_MAX_CCH)
{
*extension = NULL;
return E_INVALIDARG;
}
}
*extension = lastpoint ? lastpoint : path;
return S_OK;
}
BOOL WINAPI PathCchIsRoot(const WCHAR *path)
{
const WCHAR *root_end;
const WCHAR *next;
BOOL is_unc;
TRACE("%s\n", wine_dbgstr_w(path));
if (!path || !*path) return FALSE;
root_end = get_root_end(path);
if (!root_end) return FALSE;
if ((is_unc = is_prefixed_unc(path)) || (path[0] == '\\' && path[1] == '\\' && path[2] != '?'))
{
next = root_end + 1;
/* No extra segments */
if ((is_unc && !*next) || (!is_unc && !*next)) return TRUE;
/* Has first segment with an ending backslash but no remaining characters */
if (get_next_segment(next, &next) && !*next) return FALSE;
/* Has first segment with no ending backslash */
else if (!*next)
return TRUE;
/* Has first segment with an ending backslash and has remaining characters*/
else
{
next++;
/* Second segment must have no backslash and no remaining characters */
return !get_next_segment(next, &next) && !*next;
}
}
else if (*root_end == '\\' && !root_end[1])
return TRUE;
else
return FALSE;
}
HRESULT WINAPI PathCchRemoveBackslash(WCHAR *path, SIZE_T path_size)
{
WCHAR *path_end;
SIZE_T free_size;
TRACE("%s %lu\n", debugstr_w(path), path_size);
return PathCchRemoveBackslashEx(path, path_size, &path_end, &free_size);
}
HRESULT WINAPI PathCchRemoveBackslashEx(WCHAR *path, SIZE_T path_size, WCHAR **path_end, SIZE_T *free_size)
{
const WCHAR *root_end;
SIZE_T path_length;
TRACE("%s %lu %p %p\n", debugstr_w(path), path_size, path_end, free_size);
if (!path_size || !path_end || !free_size)
{
if (path_end) *path_end = NULL;
if (free_size) *free_size = 0;
return E_INVALIDARG;
}
path_length = strnlenW(path, path_size);
if (path_length == path_size && !path[path_length]) return E_INVALIDARG;
root_end = get_root_end(path);
if (path_length > 0 && path[path_length - 1] == '\\')
{
*path_end = path + path_length - 1;
*free_size = path_size - path_length + 1;
/* If the last character is beyond end of root */
if (!root_end || path + path_length - 1 > root_end)
{
path[path_length - 1] = 0;
return S_OK;
}
else
return S_FALSE;
}
else
{
*path_end = path + path_length;
*free_size = path_size - path_length;
return S_FALSE;
}
}
HRESULT WINAPI PathCchRemoveExtension(WCHAR *path, SIZE_T size)
{
const WCHAR *extension;
WCHAR *next;
HRESULT hr;
TRACE("%s %lu\n", wine_dbgstr_w(path), size);
if (!path || !size || size > PATHCCH_MAX_CCH) return E_INVALIDARG;
hr = PathCchFindExtension(path, size, &extension);
if (FAILED(hr)) return hr;
next = path + (extension - path);
while (next - path < size && *next) *next++ = 0;
return next == extension ? S_FALSE : S_OK;
}
HRESULT WINAPI PathCchRemoveFileSpec(WCHAR *path, SIZE_T size)
{
const WCHAR *root_end = NULL;
SIZE_T length;
WCHAR *last;
TRACE("%s %lu\n", wine_dbgstr_w(path), size);
if (!path || !size || size > PATHCCH_MAX_CCH) return E_INVALIDARG;
if (PathCchIsRoot(path)) return S_FALSE;
PathCchSkipRoot(path, &root_end);
/* The backslash at the end of UNC and \\* are not considered part of root in this case */
if (root_end && root_end > path && root_end[-1] == '\\'
&& (is_prefixed_unc(path) || (path[0] == '\\' && path[1] == '\\' && path[2] != '?')))
root_end--;
length = strlenW(path);
last = path + length - 1;
while (last >= path && (!root_end || last >= root_end))
{
if (last - path >= size) return E_INVALIDARG;
if (*last == '\\')
{
*last-- = 0;
break;
}
*last-- = 0;
}
return last != path + length - 1 ? S_OK : S_FALSE;
}
HRESULT WINAPI PathCchRenameExtension(WCHAR *path, SIZE_T size, const WCHAR *extension)
{
HRESULT hr;
TRACE("%s %lu %s\n", wine_dbgstr_w(path), size, wine_dbgstr_w(extension));
hr = PathCchRemoveExtension(path, size);
if (FAILED(hr)) return hr;
hr = PathCchAddExtension(path, size, extension);
return FAILED(hr) ? hr : S_OK;
}
HRESULT WINAPI PathCchSkipRoot(const WCHAR *path, const WCHAR **root_end)
{
static const WCHAR unc_prefix[] = {'\\', '\\', '?'};
TRACE("%s %p\n", debugstr_w(path), root_end);
if (!path || !path[0] || !root_end
|| (!memicmpW(unc_prefix, path, ARRAY_SIZE(unc_prefix)) && !is_prefixed_volume(path) && !is_prefixed_unc(path)
&& !is_prefixed_disk(path)))
return E_INVALIDARG;
*root_end = get_root_end(path);
if (*root_end)
{
(*root_end)++;
if (is_prefixed_unc(path))
{
get_next_segment(*root_end, root_end);
get_next_segment(*root_end, root_end);
}
else if (path[0] == '\\' && path[1] == '\\' && path[2] != '?')
{
/* Skip share server */
get_next_segment(*root_end, root_end);
/* If mount point is empty, don't skip over mount point */
if (**root_end != '\\') get_next_segment(*root_end, root_end);
}
}
return *root_end ? S_OK : E_INVALIDARG;
}
HRESULT WINAPI PathCchStripPrefix(WCHAR *path, SIZE_T size)
{
TRACE("%s %lu\n", wine_dbgstr_w(path), size);
if (!path || !size || size > PATHCCH_MAX_CCH) return E_INVALIDARG;
if (is_prefixed_unc(path))
{
/* \\?\UNC\a -> \\a */
if (size < strlenW(path + 8) + 3) return E_INVALIDARG;
strcpyW(path + 2, path + 8);
return S_OK;
}
else if (is_prefixed_disk(path))
{
/* \\?\C:\ -> C:\ */
if (size < strlenW(path + 4) + 1) return E_INVALIDARG;
strcpyW(path, path + 4);
return S_OK;
}
else
return S_FALSE;
}
HRESULT WINAPI PathCchStripToRoot(WCHAR *path, SIZE_T size)
{
const WCHAR *root_end;
WCHAR *segment_end;
BOOL is_unc;
TRACE("%s %lu\n", wine_dbgstr_w(path), size);
if (!path || !*path || !size || size > PATHCCH_MAX_CCH) return E_INVALIDARG;
/* \\\\?\\UNC\\* and \\\\* have to have at least two extra segments to be striped,
* e.g. \\\\?\\UNC\\a\\b\\c -> \\\\?\\UNC\\a\\b
* \\\\a\\b\\c -> \\\\a\\b */
if ((is_unc = is_prefixed_unc(path)) || (path[0] == '\\' && path[1] == '\\' && path[2] != '?'))
{
root_end = is_unc ? path + 8 : path + 3;
if (!get_next_segment(root_end, &root_end)) return S_FALSE;
if (!get_next_segment(root_end, &root_end)) return S_FALSE;
if (root_end - path >= size) return E_INVALIDARG;
segment_end = path + (root_end - path) - 1;
*segment_end = 0;
return S_OK;
}
else if (PathCchSkipRoot(path, &root_end) == S_OK)
{
if (root_end - path >= size) return E_INVALIDARG;
segment_end = path + (root_end - path);
if (!*segment_end) return S_FALSE;
*segment_end = 0;
return S_OK;
}
else
return E_INVALIDARG;
}
BOOL WINAPI PathIsUNCEx(const WCHAR *path, const WCHAR **server)
{
const WCHAR *result = NULL;
TRACE("%s %p\n", wine_dbgstr_w(path), server);
if (is_prefixed_unc(path))
result = path + 8;
else if (path[0] == '\\' && path[1] == '\\' && path[2] != '?')
result = path + 2;
if (server) *server = result;
return result ? TRUE : FALSE;
}
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