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shlwapi: Fix StrCpyNW to deal with null inputs better, and don't use lstrcpynW.

This commit is contained in:
Nikolay Sivov 2010-03-18 18:42:28 +03:00 committed by Alexandre Julliard
parent e669ffe6e5
commit 93b3ba76f6
2 changed files with 47 additions and 10 deletions
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30
dlls/shlwapi/string.c
View File

@ -507,23 +507,33 @@ LPWSTR WINAPI StrCpyW(LPWSTR lpszStr, LPCWSTR lpszSrc)
* Copy a string to another string, up to a maximum number of characters.
*
* PARAMS
* lpszStr [O] Destination string
* lpszSrc [I] Source string
* iLen [I] Maximum number of chars to copy
* dst [O] Destination string
* src [I] Source string
* count [I] Maximum number of chars to copy
*
* RETURNS
* lpszStr.
* dst.
*/
LPWSTR WINAPI StrCpyNW(LPWSTR lpszStr, LPCWSTR lpszSrc, int iLen)
LPWSTR WINAPI StrCpyNW(LPWSTR dst, LPCWSTR src, int count)
{
TRACE("(%p,%s,%i)\n", lpszStr, debugstr_w(lpszSrc), iLen);
LPWSTR d = dst;
LPCWSTR s = src;
lstrcpynW(lpszStr, lpszSrc, iLen);
return lpszStr;
TRACE("(%p,%s,%i)\n", dst, debugstr_w(src), count);
if (s)
{
while ((count > 1) && *s)
{
count--;
*d++ = *s++;
}
}
if (count) *d = 0;
return dst;
}
/*************************************************************************
* SHLWAPI_StrStrHelperA
*

27
dlls/shlwapi/tests/string.c
View File

@ -863,6 +863,33 @@ static void test_StrXXX_overflows(void)
else
win_skip("StrCatBuffA() is not available\n");
if (0)
{
/* crashes on XP */
StrCpyNW(wbuf, (LPCWSTR)0x1, 10);
StrCpyNW((LPWSTR)0x1, wstr1, 10);
}
memset(wbuf, 0xbf, sizeof(wbuf));
expect_eq(StrCpyNW(wbuf, (LPCWSTR)0x1, 1), wbuf, PWCHAR, "%p");
expect_eq(wbuf[0], 0, WCHAR, "%x");
expect_eq(wbuf[1], (WCHAR)0xbfbf, WCHAR, "%x");
memset(wbuf, 0xbf, sizeof(wbuf));
expect_eq(StrCpyNW(wbuf, 0, 10), wbuf, PWCHAR, "%p");
expect_eq(wbuf[0], 0, WCHAR, "%x");
expect_eq(wbuf[1], (WCHAR)0xbfbf, WCHAR, "%x");
memset(wbuf, 0xbf, sizeof(wbuf));
expect_eq(StrCpyNW(wbuf, 0, 0), wbuf, PWCHAR, "%p");
expect_eq(wbuf[0], (WCHAR)0xbfbf, WCHAR, "%x");
expect_eq(wbuf[1], (WCHAR)0xbfbf, WCHAR, "%x");
memset(wbuf, 0xbf, sizeof(wbuf));
expect_eq(StrCpyNW(wbuf, wstr1, 0), wbuf, PWCHAR, "%p");
expect_eq(wbuf[0], (WCHAR)0xbfbf, WCHAR, "%x");
expect_eq(wbuf[1], (WCHAR)0xbfbf, WCHAR, "%x");
memset(wbuf, 0xbf, sizeof(wbuf));
expect_eq(StrCpyNW(wbuf, wstr1, 10), wbuf, PWCHAR, "%p");
expect_eq(wbuf[9], 0, WCHAR, "%x");