Sweden-Number/dlls/kernelbase/path.c

/*
 * 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);

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 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;
}