windows-server-2003/shell/shlwapi/strings.c

//============================================================================
//
// DBCS and UNICODE aware string routines
//
//
//============================================================================

#include "priv.h"
#include "ids.h"
#include <winnlsp.h>    // Get private NORM_ flag for StrEqIntl()

#include <mluisupp.h>

#include "varutil.h"

BOOL UnicodeFromAnsi(LPWSTR *, LPCSTR, LPWSTR, int);

#define IS_DIGITA(ch)    InRange(ch, '0', '9')
#define IS_DIGITW(ch)    InRange(ch, L'0', L'9')


#define DM_INTERVAL 0

#ifdef UNIX

#ifdef BIG_ENDIAN
#define READNATIVEWORD(x) MAKEWORD(*(char*)(x), *(char*)((char*)(x) + 1))
#else 
#define READNATIVEWORD(x) MAKEWORD(*(char*)((char*)(x) + 1), *(char*)(x))
#endif

#else

#define READNATIVEWORD(x) (*(UNALIGNED WORD *)x)

#endif

__inline BOOL IsAsciiA(char ch)
{
    return !(ch & 0x80);
}

__inline BOOL IsAsciiW(WCHAR ch)
{
    return ch < 128;
}

__inline char Ascii_ToLowerA(char ch)
{
    return (ch >= 'A' && ch <= 'Z') ? (ch - 'A' + 'a') : ch;
}

__inline WCHAR Ascii_ToLowerW(WCHAR ch)
{
    return (ch >= L'A' && ch <= L'Z') ? (ch - L'A' + L'a') : ch;
}


// WARNING: all of these APIs do not setup DS, so you can not access
// any data in the default data seg of this DLL.
//
// do not create any global variables... talk to chrisg if you don't
// understand thid

/*
 * ChrCmp -  Case sensitive character comparison for DBCS
 * Assumes   w1, wMatch are characters to be compared
 * Return    FALSE if they match, TRUE if no match
 */
__inline BOOL ChrCmpA_inline(WORD w1, WORD wMatch)
{
    /* Most of the time this won't match, so test it first for speed.
    */
    if (LOBYTE(w1) == LOBYTE(wMatch))
    {
        if (IsDBCSLeadByte(LOBYTE(w1)))
        {
            return(w1 != wMatch);
        }
        return FALSE;
    }
    return TRUE;
}


__inline BOOL ChrCmpW_inline(WCHAR w1, WCHAR wMatch)
{
    return(!(w1 == wMatch));
}


/*
 * ChrCmpI - Case insensitive character comparison for DBCS
 * Assumes   w1, wMatch are characters to be compared;
 *           HIBYTE of wMatch is 0 if not a DBC
 * Return    FALSE if match, TRUE if not
 */
BOOL ChrCmpIA(WORD w1, WORD wMatch)
{
    char sz1[3], sz2[3];

    if (IsDBCSLeadByte(sz1[0] = LOBYTE(w1)))
    {
        sz1[1] = HIBYTE(w1);
        sz1[2] = '\0';
    }
    else
        sz1[1] = '\0';

#if defined(MWBIG_ENDIAN)
    sz2[0] = LOBYTE(wMatch);
    sz2[1] = HIBYTE(wMatch);
#else
    *(WORD *)sz2 = wMatch;
#endif
    sz2[2] = '\0';
    return lstrcmpiA(sz1, sz2);
}

BOOL ChrCmpIW(WCHAR w1, WCHAR wMatch)
{
    WCHAR sz1[2], sz2[2];

    sz1[0] = w1;
    sz1[1] = '\0';
    sz2[0] = wMatch;
    sz2[1] = '\0';

    return StrCmpIW(sz1, sz2);
}

LPWSTR Shlwapi_StrCpyW(LPWSTR pszDst, LPCWSTR pszSrc)
{
    LPWSTR psz = pszDst;

    RIPMSG(NULL!=pszDst, "StrCpyW: Caller passed invalid pszDst");
    RIPMSG(pszSrc && IS_VALID_STRING_PTRW(pszSrc, -1), "StrCpyW: Caller passed invalid pszSrc");
    if (pszDst && pszSrc)
    {
        while (*pszDst++ = *pszSrc++)
            ;
    }

    return psz;
}

//***   StrCpyNX[AW] -- just like StrCpyN[AW], but returns ptr to EOS
// NOTES
//  do we really need 'A' version?  (for now we do for shell32 on 'old'
//  platforms that we test on but don't ship)
LPSTR StrCpyNXA(LPSTR pszDst, LPCSTR pszSrc, int cchMax)
{
    RIPMSG(cchMax >= 0, "StrCpyNXA: Caller passed bad cchMax");
    RIPMSG(cchMax < 0 || (pszDst && IS_VALID_WRITE_BUFFER(pszDst, char, cchMax)), "StrCpyNXA: Caller passed bad pszDst");
    RIPMSG(pszSrc && IS_VALID_STRING_PTRA(pszSrc, -1), "StrCpyNXA: Caller passed bad pszSrc");

    // NOTE: Cannot use DEBUGWhackPathBuffer before copying because src and
    // dest might overlap.  Must delay whacking until after we're done.

    if (0 < cchMax)
    {
        if (!pszSrc)
            goto NullItOut;

        // Leave room for the null terminator
        while (0 < --cchMax)
        {
            if (!(*pszDst++ = *pszSrc++))
            {
                --pszDst;
                break;
            }
        }

        cchMax++;
        // in the cchMax>1 case, pszDst already points at the NULL, but reassigning it doesn't hurt
NullItOut:
        // Whack the unused part of the buffer
        DEBUGWhackPathBufferA(pszDst, cchMax);
        *pszDst = '\0';
    }

    return pszDst;
}

LPWSTR StrCpyNXW(LPWSTR pszDst, LPCWSTR pszSrc, int cchMax)
{
    RIPMSG(cchMax >= 0, "StrCpyNXW: Caller passed bad cchMax");
    RIPMSG(cchMax < 0 || (pszDst && IS_VALID_WRITE_BUFFER(pszDst, WCHAR, cchMax)), "StrCpyNXW: Caller passed bad pszDst");
    RIPMSG(pszSrc && IS_VALID_STRING_PTRW(pszSrc, -1), "StrCpyNXW: Caller passed bad pszSrc");

    // NOTE: Cannot use DEBUGWhackPathBuffer before copying because src and
    // dest might overlap.  Must delay whacking until after we're done.

    if (0 < cchMax)
    {
        if (!pszSrc) // a test app passed in a NULL src ptr and we faulted, let's not fault here.
            goto NullItOut;

        // Leave room for the null terminator
        while (0 < --cchMax)
        {
            if (!(*pszDst++ = *pszSrc++))
            {
                --pszDst;
                break;
            }
        }

        cchMax++;
        // in the cchMax>1 case, pszDst already points at the NULL, but reassigning it doesn't hurt
NullItOut:
        // Whack the unused part of the buffer
        DEBUGWhackPathBufferW(pszDst, cchMax);
        *pszDst = L'\0';
    }

    return pszDst;
}

LPWSTR StrCpyNW(LPWSTR pszDst, LPCWSTR pszSrc, int cchMax)
{
    StrCpyNXW(pszDst, pszSrc, cchMax);
    return pszDst;
}

LPWSTR Shlwapi_StrCatW(LPWSTR pszDst, LPCWSTR pszSrc)
{
    LPWSTR psz = pszDst;

    RIPMSG(pszDst && IS_VALID_STRING_PTRW(pszDst, -1), "StrCatW: Caller passed invalid pszDst");
    RIPMSG(pszSrc && IS_VALID_STRING_PTRW(pszSrc, -1), "StrCatW: Caller passed invalid pszSrc");
    if (pszDst && pszSrc)
    {
        while (0 != *pszDst)
            pszDst++;

        while (*pszDst++ = *pszSrc++)
            ;
    }
    return psz;
}

LWSTDAPI_(LPWSTR) StrCatBuffW(LPWSTR pszDest, LPCWSTR pszSrc, int cchDestBuffSize)
{
    RIPMSG(pszDest && IS_VALID_STRING_PTRW(pszDest, -1), "StrCatBuffW: Caller passed invalid pszDest");
    RIPMSG(pszSrc && IS_VALID_STRING_PTRW(pszSrc, -1), "StrCatBuffW: Caller passed invalid pszSrc");
    RIPMSG(cchDestBuffSize >= 0, "StrCatBuffW: Caller passed invalid cchDestBuffSize");
    RIPMSG(!(pszDest && IS_VALID_STRING_PTRW(pszDest, -1)) || cchDestBuffSize<0 || lstrlenW(pszDest)<cchDestBuffSize, "StrCatBuffW: Caller passed odd pszDest - string larger than cchDestBuffSize!");
    DEBUGWhackPathStringW(pszDest, cchDestBuffSize);

    if (pszDest && pszSrc)
    {
        LPWSTR psz = pszDest;

        // we walk forward till we find the end of pszDest, subtracting
        // from cchDestBuffSize as we go.
        while (*psz)
        {
            psz++;
            cchDestBuffSize--;
        }

        if (cchDestBuffSize > 0)
        {
            // call the shlwapi function here because win95 does not have lstrcpynW
            StrCpyNW(psz, pszSrc, cchDestBuffSize);
        }
    }
    return pszDest;
}

 
LWSTDAPI_(LPSTR) StrCatBuffA(LPSTR pszDest, LPCSTR pszSrc, int cchDestBuffSize)
{
    RIPMSG(pszDest && IS_VALID_STRING_PTRA(pszDest, -1), "StrCatBuffA: Caller passed invalid pszDest");
    RIPMSG(pszSrc && IS_VALID_STRING_PTRA(pszSrc, -1), "StrCatBuffA: Caller passed invalid pszSrc");
    RIPMSG(cchDestBuffSize >= 0, "StrCatBuffA: Caller passed invalid cchDestBuffSize");
    RIPMSG(!(pszDest && IS_VALID_STRING_PTRA(pszDest, -1)) || cchDestBuffSize<0 || lstrlen(pszDest)<cchDestBuffSize, "StrCatBuffA: Caller passed odd pszDest - string larger than cchDestBuffSize!");
    DEBUGWhackPathStringA(pszDest, cchDestBuffSize);

    if (pszDest && pszSrc)
    {
        LPSTR psz = pszDest;
        
        // we walk forward till we find the end of pszDest, subtracting
        // from cchDestBuffSize as we go.
        while (*psz)
        {
            psz++;
            cchDestBuffSize--;
        }

        if (cchDestBuffSize > 0)
        {
            // Let kernel do the work for us. 
            //
            // WARNING: We might generate a truncated DBCS sting becuase kernel's lstrcpynA
            // dosent check for this. Ask me if I care.
            lstrcpynA(psz, pszSrc, cchDestBuffSize);
        }
    }

    return pszDest;
}
   

/* StrNCat(front, back, count) - append count chars of back onto front
 */
LPSTR Shlwapi_StrNCatA(LPSTR front, LPCSTR back, int cchMax)
{
    LPSTR start = front;

    RIPMSG(front && IS_VALID_STRING_PTRA(front, -1), "StrNCatA: Caller passed invalid front");
    RIPMSG(back && IS_VALID_STRING_PTRA(front, cchMax), "StrNCatA: Caller passed invalid back");
    RIPMSG(cchMax >= 0, "StrNCatA: Caller passed invalid cchMax");
    if (front && back)
    {
        while (*front++)
                    ;
        front--;

        lstrcpyn(front, back, cchMax);
    }
    return(start);    
}

LPWSTR Shlwapi_StrNCatW(LPWSTR front, LPCWSTR back, int cchMax)
{
    LPWSTR start = front;

    RIPMSG(front && IS_VALID_STRING_PTRW(front, -1), "StrNCatW: Caller passed invalid front");
    RIPMSG(back && IS_VALID_STRING_PTRW(front, cchMax), "StrNCatW: Caller passed invalid back");
    RIPMSG(cchMax >= 0, "StrNCatW: Caller passed invalid cchMax");
    if (front && back)
    {
        while (*front++)
                    ;
        front--;

        StrCpyNW(front, back, cchMax);
    }    
    return(start);    
}

/*
 * StrChr - Find first occurrence of character in string
 * Assumes   lpStart points to start of null terminated string
 *           wMatch  is the character to match
 * returns ptr to the first occurrence of ch in str, NULL if not found.
 */
LPSTR _StrChrA(LPCSTR lpStart, WORD wMatch, BOOL fMBCS)
{
    if (fMBCS) {
        for ( ; *lpStart; lpStart = AnsiNext(lpStart))
        {
            if (!ChrCmpA_inline(READNATIVEWORD(lpStart), wMatch))
                return((LPSTR)lpStart);
        }
    } else {
        for ( ; *lpStart; lpStart++)
        {
            if ((BYTE)*lpStart == LOBYTE(wMatch)) {
                return((LPSTR)lpStart);
            }
        }
    }
    return (NULL);
}

LPSTR StrChrA(LPCSTR lpStart, WORD wMatch)
{
    CPINFO cpinfo;

    RIPMSG(lpStart && IS_VALID_STRING_PTR(lpStart, -1), "StrChrA: caller passed bad lpStart");
    if (!lpStart)
        return NULL;

    return _StrChrA(lpStart, wMatch, GetCPInfo(CP_ACP, &cpinfo) && cpinfo.LeadByte[0]);
}

#ifdef ALIGNMENT_SCENARIO

LPWSTR StrChrSlowW(const UNALIGNED WCHAR *lpStart, WCHAR wMatch)
{
    for ( ; *lpStart; lpStart++)
    {
        if (!ChrCmpW_inline(*lpStart, wMatch))
        {
            return((LPWSTR)lpStart);
        }
    }
    return NULL;
}
#endif

LPWSTR StrChrW(LPCWSTR lpStart, WCHAR wMatch)
{
    RIPMSG(lpStart && IS_VALID_STRING_PTRW(lpStart, -1), "StrChrW: caller passed bad lpStart");
    if (!lpStart)
        return NULL;

    //
    //  raymondc
    //  Apparently, somebody is passing unaligned strings to StrChrW.
    //  Find out who and make them stop.
    //
    RIPMSG(!((ULONG_PTR)lpStart & 1), "StrChrW: caller passed UNALIGNED lpStart"); // Assert alignedness

#ifdef ALIGNMENT_SCENARIO
    //
    //  Since unaligned strings arrive so rarely, put the slow
    //  version in a separate function so the common case stays
    //  fast.  Believe it or not, we call StrChrW so often that
    //  it is now a performance-sensitive function!
    //
    if ((ULONG_PTR)lpStart & 1)
        return StrChrSlowW(lpStart, wMatch);
#endif

    for ( ; *lpStart; lpStart++)
    {
        if (!ChrCmpW_inline(*lpStart, wMatch))
        {
            return((LPWSTR)lpStart);
        }
    }
    return (NULL);
}

/*
 * StrChrN - Find first occurrence of character in string
 * Assumes   lpStart points to start of null terminated string
 *           wMatch  is the character to match
 * returns ptr to the first occurrence of ch in str, NULL if not found.
 */

#ifdef ALIGNMENT_SCENARIO

LPWSTR StrChrSlowNW(const UNALIGNED WCHAR *lpStart, WCHAR wMatch, UINT cchMax)
{
    LPCWSTR lpSentinel = lpStart + cchMax;
    for ( ; *lpStart && lpStart < lpSentinel; lpStart++)
    {
        if (!ChrCmpW_inline(*lpStart, wMatch))
        {
            return((LPWSTR)lpStart);
        }
    }
}
#endif

LPWSTR StrChrNW(LPCWSTR lpStart, WCHAR wMatch, UINT cchMax)
{
    LPCWSTR lpSentinel = lpStart + cchMax;

    RIPMSG(lpStart && IS_VALID_STRING_PTRW(lpStart, -1), "StrChrNW: caller passed bad lpStart");
    if (!lpStart)
        return NULL;

    //
    //  raymondc
    //  Apparently, somebody is passing unaligned strings to StrChrW.
    //  Find out who and make them stop.
    //
    RIPMSG(!((ULONG_PTR)lpStart & 1), "StrChrNW: caller passed UNALIGNED lpStart"); // Assert alignedness

#ifdef ALIGNMENT_SCENARIO
    //
    //  Since unaligned strings arrive so rarely, put the slow
    //  version in a separate function so the common case stays
    //  fast.  Believe it or not, we call StrChrW so often that
    //  it is now a performance-sensitive function!
    //
    if ((ULONG_PTR)lpStart & 1)
        return StrChrSlowNW(lpStart, wMatch, cchMax);
#endif

    for ( ; *lpStart && lpStart<lpSentinel; lpStart++)
    {
        if (!ChrCmpW_inline(*lpStart, wMatch))
        {
            return((LPWSTR)lpStart);
        }
    }
    return (NULL);
}


/*
 * StrRChr - Find last occurrence of character in string
 * Assumes   lpStart points to start of string
 *           lpEnd   points to end of string (NOT included in search)
 *           wMatch  is the character to match
 * returns ptr to the last occurrence of ch in str, NULL if not found.
 */
LPSTR StrRChrA(LPCSTR lpStart, LPCSTR lpEnd, WORD wMatch)
{
    LPCSTR lpFound = NULL;

    RIPMSG(lpStart && IS_VALID_STRING_PTR(lpStart, -1), "StrRChrA: caller passed bad lpStart");
    RIPMSG(!lpEnd || lpEnd <= lpStart + lstrlenA(lpStart), "StrRChrA: caller passed bad lpEnd");
    // don't need to check for NULL lpStart

    if (!lpEnd)
        lpEnd = lpStart + lstrlenA(lpStart);

    for ( ; lpStart < lpEnd; lpStart = AnsiNext(lpStart))
    {
        // (ChrCmp returns FALSE when characters match)

        if (!ChrCmpA_inline(READNATIVEWORD(lpStart), wMatch))
            lpFound = lpStart;
    }
    return ((LPSTR)lpFound);
}

LPWSTR StrRChrW(LPCWSTR lpStart, LPCWSTR lpEnd, WCHAR wMatch)
{
    LPCWSTR lpFound = NULL;

    RIPMSG(lpStart && IS_VALID_STRING_PTRW(lpStart, -1), "StrRChrW: caller passed bad lpStart");
    RIPMSG(!lpEnd || lpEnd <= lpStart + lstrlenW(lpStart), "StrRChrW: caller passed bad lpEnd");
    // don't need to check for NULL lpStart

    if (!lpEnd)
        lpEnd = lpStart + lstrlenW(lpStart);

    for ( ; lpStart < lpEnd; lpStart++)
    {
        if (!ChrCmpW_inline(*lpStart, wMatch))
            lpFound = lpStart;
    }
    return ((LPWSTR)lpFound);
}

/*
 * StrChrI - Find first occurrence of character in string, case insensitive
 * Assumes   lpStart points to start of null terminated string
 *           wMatch  is the character to match
 * returns ptr to the first occurrence of ch in str, NULL if not found.
 */
LPSTR StrChrIA(LPCSTR lpStart, WORD wMatch)
{
    RIPMSG(lpStart && IS_VALID_STRING_PTRA(lpStart, -1), "StrChrIA: caller passed bad lpStart");
    if (lpStart)
    {
        wMatch = (UINT)(IsDBCSLeadByte(LOBYTE(wMatch)) ? wMatch : LOBYTE(wMatch));

        for ( ; *lpStart; lpStart = AnsiNext(lpStart))
        {
            if (!ChrCmpIA(READNATIVEWORD(lpStart), wMatch))
                return((LPSTR)lpStart);
        }
    }
    return (NULL);
}

LPWSTR StrChrIW(LPCWSTR lpStart, WCHAR wMatch)
{
    RIPMSG(lpStart && IS_VALID_STRING_PTRW(lpStart, -1), "StrChrIW: caller passed bad lpStart");
    if (lpStart)
    {
        for ( ; *lpStart; lpStart++)
        {
            if (!ChrCmpIW(*lpStart, wMatch))
                return((LPWSTR)lpStart);
        }
    }
    return (NULL);
}

/*
 * StrChrNI - Find first occurrence of character in string, case insensitive, counted
 *
 */
LPWSTR StrChrNIW(LPCWSTR lpStart, WCHAR wMatch, UINT cchMax)
{
    RIPMSG(lpStart && IS_VALID_STRING_PTRW(lpStart, -1), "StrChrNIW: caller passed bad lpStart");
    if (lpStart)
    {
        LPCWSTR lpSentinel = lpStart + cchMax;
        
        for ( ; *lpStart && lpStart < lpSentinel; lpStart++)
        {
            if (!ChrCmpIW(*lpStart, wMatch))
                return((LPWSTR)lpStart);
        }
    }
    return (NULL);
}

/*
 * StrRChrI - Find last occurrence of character in string, case insensitive
 * Assumes   lpStart points to start of string
 *           lpEnd   points to end of string (NOT included in search)
 *           wMatch  is the character to match
 * returns ptr to the last occurrence of ch in str, NULL if not found.
 */
LPSTR StrRChrIA(LPCSTR lpStart, LPCSTR lpEnd, WORD wMatch)
{
    LPCSTR lpFound = NULL;

    RIPMSG(lpStart && IS_VALID_STRING_PTRA(lpStart, -1), "StrRChrIA: caller passed bad lpStart");
    RIPMSG(!lpEnd || lpEnd <= lpStart + lstrlenA(lpStart), "StrRChrIA: caller passed bad lpEnd");

    if (!lpEnd)
        lpEnd = lpStart + lstrlenA(lpStart);

    wMatch = (UINT)(IsDBCSLeadByte(LOBYTE(wMatch)) ? wMatch : LOBYTE(wMatch));

    for ( ; lpStart < lpEnd; lpStart = AnsiNext(lpStart))
    {
        if (!ChrCmpIA(READNATIVEWORD(lpStart), wMatch))
            lpFound = lpStart;
    }
    return ((LPSTR)lpFound);
}


LPWSTR StrRChrIW(LPCWSTR lpStart, LPCWSTR lpEnd, WCHAR wMatch)
{
    LPCWSTR lpFound = NULL;

    RIPMSG(lpStart && IS_VALID_STRING_PTRW(lpStart, -1), "StrRChrIW: caller passed bad lpStart");
    RIPMSG(!lpEnd || lpEnd <= lpStart + lstrlenW(lpStart), "StrRChrIW: caller passed bad lpEnd");

    if (!lpEnd)
        lpEnd = lpStart + lstrlenW(lpStart);

    for ( ; lpStart < lpEnd; lpStart++)
    {
        if (!ChrCmpIW(*lpStart, wMatch))
            lpFound = lpStart;
    }
    return ((LPWSTR)lpFound);
}


/*----------------------------------------------------------
Purpose: Returns a pointer to the first occurrence of a character
         in psz that belongs to the set of characters in pszSet.
         The search does not include the null terminator.

         If psz contains no characters that are in the set of
         characters in pszSet, this function returns NULL.

         This function is DBCS-safe.

Returns: see above
Cond:    --
*/
LPSTR StrPBrkA(LPCSTR psz, LPCSTR pszSet)
{
    RIPMSG(psz && IS_VALID_STRING_PTRA(psz, -1), "StrPBrkA: caller passed bad psz");
    RIPMSG(pszSet && IS_VALID_STRING_PTRA(pszSet, -1), "StrPBrkA: caller passed bad pszSet");
    if (psz && pszSet)
    {
        while (*psz)
        {
            LPCSTR pszSetT;
            for (pszSetT = pszSet; *pszSetT; pszSetT = CharNextA(pszSetT))
            {
                if (*psz == *pszSetT)
                {
                    // Found first character that matches
                    return (LPSTR)psz;      // Const -> non-const
                }
            }
            psz = CharNextA(psz);
        }
    }
    return NULL;
}


/*----------------------------------------------------------
Purpose: Returns a pointer to the first occurrence of a character
         in psz that belongs to the set of characters in pszSet.
         The search does not include the null terminator.

Returns: see above
Cond:    --
*/
LPWSTR WINAPI StrPBrkW(LPCWSTR psz, LPCWSTR pszSet)
{
    RIPMSG(psz && IS_VALID_STRING_PTRW(psz, -1), "StrPBrkA: caller passed bad psz");
    RIPMSG(pszSet && IS_VALID_STRING_PTRW(pszSet, -1), "StrPBrkA: caller passed bad pszSet");
    if (psz && pszSet)
    {
        while (*psz)
        {
            LPCWSTR pszSetT;
            for (pszSetT = pszSet; *pszSetT; pszSetT++)
            {
                if (*psz == *pszSetT)
                {
                    // Found first character that matches
                    return (LPWSTR)psz;     // Const -> non-const
                }
            }
            psz++;
        }
    }
    return NULL;
}


int WINAPI StrToIntA(LPCSTR lpSrc)
{
    RIPMSG(lpSrc && IS_VALID_STRING_PTRA(lpSrc, -1), "StrToIntA: Caller passed bad lpSrc");
    if (lpSrc)
    {
        int n = 0;
        BOOL bNeg = FALSE;

        if (*lpSrc == '-')
        {
            bNeg = TRUE;
            lpSrc++;
        }

        while (IS_DIGITA(*lpSrc))
        {
            n *= 10;
            n += *lpSrc - '0';
            lpSrc++;
        }
        return bNeg ? -n : n;
    }
    return 0;
}


int WINAPI StrToIntW(LPCWSTR lpSrc)
{
    RIPMSG(lpSrc && IS_VALID_STRING_PTRW(lpSrc, -1), "StrToIntW: Caller passed bad lpSrc");
    if (lpSrc)
    {
        int n = 0;
        BOOL bNeg = FALSE;

        if (*lpSrc == L'-')
        {
            bNeg = TRUE;
            lpSrc++;
        }

        while (IS_DIGITW(*lpSrc))
        {
            n *= 10;
            n += *lpSrc - L'0';
            lpSrc++;
        }
        return bNeg ? -n : n;
    }
    return 0;
}

/*----------------------------------------------------------
Purpose: Special verion of atoi.  Supports hexadecimal too.

         If this function returns FALSE, *phRet is set to 0.

Returns: TRUE if the string is a number, or contains a partial number
         FALSE if the string is not a number

        dwFlags are STIF_ bitfield
Cond:    --
*/
BOOL WINAPI StrToInt64ExW(LPCWSTR pszString, DWORD dwFlags, LONGLONG *pllRet)
{
    BOOL bRet;

    RIPMSG(pszString && IS_VALID_STRING_PTRW(pszString, -1), "StrToInt64ExW: caller passed bad pszString");
    if (pszString)
    {
        LONGLONG n;
        BOOL bNeg = FALSE;
        LPCWSTR psz;
        LPCWSTR pszAdj;

        // Skip leading whitespace
        //
        for (psz = pszString; *psz == L' ' || *psz == L'\n' || *psz == L'\t'; psz++)
            ;

        // Determine possible explicit signage
        //
        if (*psz == L'+' || *psz == L'-')
        {
            bNeg = (*psz == L'+') ? FALSE : TRUE;
            psz++;
        }

        // Or is this hexadecimal?
        //
        pszAdj = psz+1;
        if ((STIF_SUPPORT_HEX & dwFlags) &&
            *psz == L'0' && (*pszAdj == L'x' || *pszAdj == L'X'))
        {
            // Yes

            // (Never allow negative sign with hexadecimal numbers)
            bNeg = FALSE;
            psz = pszAdj+1;

            pszAdj = psz;

            // Do the conversion
            //
            for (n = 0; ; psz++)
            {
                if (IS_DIGITW(*psz))
                    n = 0x10 * n + *psz - L'0';
                else
                {
                    WCHAR ch = *psz;
                    int n2;

                    if (ch >= L'a')
                        ch -= L'a' - L'A';

                    n2 = ch - L'A' + 0xA;
                    if (n2 >= 0xA && n2 <= 0xF)
                        n = 0x10 * n + n2;
                    else
                        break;
                }
            }

            // Return TRUE if there was at least one digit
            bRet = (psz != pszAdj);
        }
        else
        {
            // No
            pszAdj = psz;

            // Do the conversion
            for (n = 0; IS_DIGITW(*psz); psz++)
                n = 10 * n + *psz - L'0';

            // Return TRUE if there was at least one digit
            bRet = (psz != pszAdj);
        }

        if (pllRet)
        {
            *pllRet = bNeg ? -n : n;
        }
    }
    else
    {
        bRet = FALSE;
    }

    return bRet;
}

/*----------------------------------------------------------
 Purpose: ansi wrapper for StrToInt64ExW.

 Returns: see StrToInt64ExW
 Cond:    --
 */
BOOL WINAPI StrToInt64ExA(
    LPCSTR    pszString,
    DWORD     dwFlags,          // STIF_ bitfield
    LONGLONG FAR * pllRet)
{
    BOOL bRet;

    RIPMSG(pszString && IS_VALID_STRING_PTRA(pszString, -1), "StrToInt64ExA: caller passed bad pszString");
    if (pszString)
    {
        // Most strings will simply use this temporary buffer, but UnicodeFromAnsi
        // will allocate a buffer if the supplied string is bigger.
        WCHAR szBuf[MAX_PATH];
        LPWSTR pwszString;

        bRet = UnicodeFromAnsi(&pwszString, pszString, szBuf, SIZECHARS(szBuf));
        if (bRet)
        {
            bRet = StrToInt64ExW(pwszString, dwFlags, pllRet);
            UnicodeFromAnsi(&pwszString, NULL, szBuf, 0);
        }
    }
    else
    {
        bRet = FALSE;
    }

    return bRet;
}

/*----------------------------------------------------------
 Purpose: Calls StrToInt64ExA (the real work horse), and 
          then casts down to an int.
 Returns: see StrToInt64ExA
 */
BOOL WINAPI StrToIntExA(
    LPCSTR pszString, 
    DWORD  dwFlags, 
    int   *piRet)
{
    LONGLONG llVal;
    BOOL fReturn;

    RIPMSG(pszString && IS_VALID_STRING_PTRA(pszString, -1), "StrToIntExA: caller passed bad pszString");

    fReturn = StrToInt64ExA(pszString, dwFlags, &llVal);
    *piRet = fReturn ? (int)llVal : 0;
    return(fReturn);
}

/*----------------------------------------------------------
 Purpose: Calls StrToInt64ExW (the real work horse), and 
          then casts down to an int.
 Returns: see StrToInt64ExW
 */
BOOL WINAPI StrToIntExW(
    LPCWSTR   pwszString,
    DWORD     dwFlags,          // STIF_ bitfield
    int FAR * piRet)
{
    LONGLONG llVal;
    BOOL fReturn;

    RIPMSG(pwszString && IS_VALID_STRING_PTRW(pwszString, -1), "StrToIntExW: caller passed bad pwszString");

    fReturn = StrToInt64ExW(pwszString, dwFlags, &llVal);
    *piRet = fReturn ? (int)llVal : 0;
    return(fReturn);
}

/*----------------------------------------------------------
 Purpose: Returns an integer value specifying the length of
 the substring in psz that consists entirely of
 characters in pszSet.  If psz begins with a character
 not in pszSet, then this function returns 0.

 This is a DBCS-safe version of the CRT strspn().

 Returns: see above
 Cond:    --
 */
int StrSpnA(LPCSTR psz, LPCSTR pszSet)
{
    LPCSTR pszT = psz;

    RIPMSG(psz && IS_VALID_STRING_PTRA(psz, -1), "StrSpnA: caller passed bad psz");
    RIPMSG(pszSet && IS_VALID_STRING_PTRA(pszSet, -1), "StrSpnA: caller passed bad pszSet");
    if (psz && pszSet)
    {
        // Go thru the string to be inspected
        for ( ; *pszT; pszT = CharNextA(pszT))
        {
            LPCSTR pszSetT;
            
            // Go thru the char set
            for (pszSetT = pszSet; *pszSetT; pszSetT = CharNextA(pszSetT))
            {
                if (*pszSetT == *pszT)
                {
                    if ( !IsDBCSLeadByte(*pszSetT) )
                    {
                        break;      // Chars match
                    }
                    else if (pszSetT[1] == pszT[1])
                    {
                        break;      // Chars match
                    }
                }
            }

            // End of char set?
            if (0 == *pszSetT)
            {
                break;      // Yes, no match on this inspected char
            }
        }
    }
    return (int)(pszT - psz);
}


/*----------------------------------------------------------
 Purpose: Returns an integer value specifying the length of
 the substring in psz that consists entirely of
 characters in pszSet.  If psz begins with a character
 not in pszSet, then this function returns 0.

 This is a DBCS-safe version of the CRT strspn().

 Returns: see above
 Cond:    --
 */
STDAPI_(int) StrSpnW(LPCWSTR psz, LPCWSTR pszSet)
{
    LPCWSTR pszT = psz;

    RIPMSG(psz && IS_VALID_STRING_PTRW(psz, -1), "StrSpnW: caller passed bad psz");
    RIPMSG(pszSet && IS_VALID_STRING_PTRW(pszSet, -1), "StrSpnW: caller passed bad pszSet");
    if (psz && pszSet)
    {
        // Go thru the string to be inspected
        for ( ; *pszT; pszT++)
        {
            LPCWSTR pszSetT;

            // Go thru the char set
            for (pszSetT = pszSet; *pszSetT != *pszT; pszSetT++)
            {
                if (0 == *pszSetT)
                {
                    // Reached end of char set without finding a match
                    return (int)(pszT - psz);
                }
            }
        }
    }
    return (int)(pszT - psz);
}


// StrCSpn: return index to first char of lpStr that is present in lpSet.
// Includes the NUL in the comparison; if no lpSet chars are found, returns
// the index to the NUL in lpStr.
// Just like CRT strcspn.
//
int StrCSpnA(LPCSTR lpStr, LPCSTR lpSet)
{
    LPCSTR lp = lpStr;

    RIPMSG(lpStr && IS_VALID_STRING_PTRA(lpStr, -1), "StrCSpnA: Caller passed bad lpStr");
    RIPMSG(lpSet && IS_VALID_STRING_PTRA(lpSet, -1), "StrCSpnA: Caller passed bad lpSet");

    if (lpStr && lpSet)
    {
        // nature of the beast: O(lpStr*lpSet) work
        while (*lp)
        {
            if (StrChrA(lpSet, READNATIVEWORD(lp)))
                return (int)(lp-lpStr);
            lp = AnsiNext(lp);
        }
    }
    return (int)(lp-lpStr); // ==lstrlen(lpStr)
}

int StrCSpnW(LPCWSTR lpStr, LPCWSTR lpSet)
{
    LPCWSTR lp = lpStr;

    RIPMSG(lpStr && IS_VALID_STRING_PTRW(lpStr, -1), "StrCSpnW: Caller passed bad lpStr");
    RIPMSG(lpSet && IS_VALID_STRING_PTRW(lpSet, -1), "StrCSpnW: Caller passed bad lpSet");

    if (lpStr && lpSet)
    {
        // nature of the beast: O(lpStr*lpSet) work
        while (*lp)
        {
            if (StrChrW(lpSet, *lp))
                return (int)(lp-lpStr);
            lp++;
        }
    }
    return (int)(lp-lpStr); // ==lstrlen(lpStr)
}

// StrCSpnI: case-insensitive version of StrCSpn.
//
int StrCSpnIA(LPCSTR lpStr, LPCSTR lpSet)
{
    LPCSTR lp = lpStr;

    RIPMSG(lpStr && IS_VALID_STRING_PTRA(lpStr, -1), "StrCSpnIA: Caller passed bad lpStr");
    RIPMSG(lpSet && IS_VALID_STRING_PTRA(lpSet, -1), "StrCSpnIA: Caller passed bad lpSet");

    if (lpStr && lpSet)
    {
        // nature of the beast: O(lpStr*lpSet) work
        while (*lp)
        {
            if (StrChrIA(lpSet, READNATIVEWORD(lp)))
                return (int)(lp-lpStr);
            lp = AnsiNext(lp);
        }
    }
    return (int)(lp-lpStr); // ==lstrlen(lpStr)
}

int StrCSpnIW(LPCWSTR lpStr, LPCWSTR lpSet)
{
    LPCWSTR lp = lpStr;

    RIPMSG(lpStr && IS_VALID_STRING_PTRW(lpStr, -1), "StrCSpnIW: Caller passed bad lpStr");
    RIPMSG(lpSet && IS_VALID_STRING_PTRW(lpSet, -1), "StrCSpnIW: Caller passed bad lpSet");

    if (lpStr && lpSet)
    {
        // nature of the beast: O(lpStr*lpSet) work
        while (*lp)
        {
            if (StrChrIW(lpSet, *lp))
                return (int)(lp-lpStr);
            lp++;
        }
    }
    return (int)(lp-lpStr); // ==lstrlen(lpStr)
}


/*
 * StrCmpN      - Compare n bytes
 *
 * returns   See lstrcmp return values.
 */
int _StrCmpNA(LPCSTR lpStr1, LPCSTR lpStr2, int nChar, BOOL fMBCS)
{
    if (lpStr1 && lpStr2)
    {
        LPCSTR lpszEnd = lpStr1 + nChar;
        char sz1[4];
        char sz2[4];

        if (fMBCS) {
            for ( ; (lpszEnd > lpStr1) && (*lpStr1 || *lpStr2); lpStr1 = AnsiNext(lpStr1), lpStr2 = AnsiNext(lpStr2)) {
                WORD w1;
                WORD w2;
        
                // If either pointer is at the null terminator already,
                // we want to copy just one byte to make sure we don't read 
                // past the buffer (might be at a page boundary).
        
                w1 = (*lpStr1) ? READNATIVEWORD(lpStr1) : 0;
                w2 = (*lpStr2) ? READNATIVEWORD(lpStr2) : 0;
        
                // (ChrCmpA returns FALSE if the characters match)
        
                // Do the characters match?
                if (ChrCmpA_inline(w1, w2)) 
                {
                    // No; determine the lexical value of the comparison
                    // (since ChrCmp just returns true/false).
        
                    // Since the character may be a DBCS character; we
                    // copy two bytes into each temporary buffer 
                    // (in preparation for the lstrcmp call).
        
                    (*(WORD *)sz1) = w1;
                    (*(WORD *)sz2) = w2;
        
                    // Add null terminators to temp buffers
                    *AnsiNext(sz1) = 0;
                    *AnsiNext(sz2) = 0;
                    return lstrcmpA(sz1, sz2);
                }
            }
        } else {
            for ( ; (lpszEnd > lpStr1) && (*lpStr1 || *lpStr2); lpStr1++, lpStr2++) {
                if (*lpStr1 != *lpStr2) {
                    // No; determine the lexical value of the comparison
                    // (since ChrCmp just returns true/false).
                    sz1[0] = *lpStr1;
                    sz2[0] = *lpStr2;
                    sz1[1] = sz2[1] = '\0';
                    return lstrcmpA(sz1, sz2);
                }
            }
        }
    }
    
    return 0;
}

STDAPI_(int) StrCmpNA(LPCSTR psz1, LPCSTR psz2, int nChar)
{
    CPINFO cpinfo;

    RIPMSG(nChar == 0 || (psz1 && IS_VALID_STRING_PTRA(psz1, nChar)), "StrCmpNA: Caller passed bad psz1");
    RIPMSG(nChar == 0 || (psz2 && IS_VALID_STRING_PTRA(psz2, nChar)), "StrCmpNA: Caller passed bad psz2");
    RIPMSG(nChar >= 0, "StrCmpNA: caller passed bad nChar");

    return _StrCmpNA(psz1, psz2, nChar, GetCPInfo(CP_ACP, &cpinfo) && cpinfo.LeadByte[0]);
}

// cch1 and cch2 are the maximum # of chars to compare

int _StrCmpLocaleW(DWORD dwFlags, LPCWSTR psz1, int cch1, LPCWSTR psz2, int cch2)
{
    int i = CompareStringW(GetThreadLocale(), dwFlags, psz1, cch1, psz2, cch2);
    if (!i)
    {
        i = CompareStringW(LOCALE_SYSTEM_DEFAULT, dwFlags, psz1, cch1, psz2, cch2);
    }
    return i - CSTR_EQUAL;
}

int _StrCmpLocaleA(DWORD dwFlags, LPCSTR psz1, int cch1, LPCSTR psz2, int cch2)
{
    int i = CompareStringA(GetThreadLocale(), dwFlags, psz1, cch1, psz2, cch2);
    if (!i)
    {
        i = CompareStringA(LOCALE_SYSTEM_DEFAULT, dwFlags, psz1, cch1, psz2, cch2);
    }
    return i - CSTR_EQUAL;
}


STDAPI_(int) StrCmpNW(LPCWSTR psz1, LPCWSTR psz2, int nChar)
{
    RIPMSG(nChar==0 || (psz1 && IS_VALID_STRING_PTRW(psz1, nChar)), "StrCmpNW: Caller passed bad psz1");
    RIPMSG(nChar==0 || (psz2 && IS_VALID_STRING_PTRW(psz2, nChar)), "StrCmpNW: Caller passed bad psz2");
    RIPMSG(nChar>=0, "StrCmpNA: caller passed bad nChar");

    return _StrCmpLocaleW(NORM_STOP_ON_NULL, psz1, nChar, psz2, nChar);
}

/*
 * Compare n bytes, case insensitive
 *
 * returns   See lstrcmpi return values.
 */

int StrCmpNIA(LPCSTR psz1, LPCSTR psz2, int nChar)
{
    int nChar1, nChar2;

    RIPMSG(nChar==0 || (psz1 && IS_VALID_STRING_PTRA(psz1, nChar)), "StrCmpNIA: Caller passed bad psz1");
    RIPMSG(nChar==0 || (psz2 && IS_VALID_STRING_PTRA(psz2, nChar)), "StrCmpNIA: Caller passed bad psz2");
    RIPMSG(nChar>=0, "StrCmpNIA: caller passed bad nChar");

    // Include the (nChar && (!psz1 || !psz2)) cases here so we go through the
    // validation layer and return the appropriate invalid parameter error code
    // instead of faulting on Win95.
    //
    // NOTE!  That this means that StrCmpNI(NULL, NULL, 0) on NT returns -2
    // but StrCmpNI(NULL, NULL, 0) on Win9x returns 0.  This has always been
    // the case -- changing it is too scary for app compat reasons.
    //

    // NORM_STOP_ON_NULL is not supported by the ANSI version on NT
    // so we have to emulate it
    if (nChar && (!psz1 || !psz2))
    {
        // This is the error scenario we are forcing through
        nChar1 = nChar;
        nChar2 = nChar;
    }
    else
    {
        // nChar1 = min(nChar, lstrlen(psz1))
        // except that the "for" loop will not read more than nChar
        // characters from psz1 because psz1 might not be NULL-terminated
        for (nChar1 = 0; nChar1 < nChar && psz1[nChar1]; nChar1++) { }

        // And similarly for nChar2
        for (nChar2 = 0; nChar2 < nChar && psz2[nChar2]; nChar2++) { }
    }

    return _StrCmpLocaleA(NORM_IGNORECASE, psz1, nChar1, psz2, nChar2);
}

int StrCmpNIW(LPCWSTR psz1, LPCWSTR psz2, int nChar)
{
    RIPMSG(nChar==0 || (psz1 && IS_VALID_STRING_PTRW(psz1, nChar)), "StrCmpNIW: Caller passed bad psz1");
    RIPMSG(nChar==0 || (psz2 && IS_VALID_STRING_PTRW(psz2, nChar)), "StrCmpNIW: Caller passed bad psz2");
    RIPMSG(nChar>=0, "StrCmpNW: caller passed bad nChar");

    return _StrCmpLocaleW(NORM_IGNORECASE | NORM_STOP_ON_NULL, psz1, nChar, psz2, nChar);
}


/*
 * StrRStrI      - Search for last occurrence of a substring
 *
 * Assumes   lpSource points to the null terminated source string
 *           lpLast points to where to search from in the source string
 *           lpLast is not included in the search
 *           lpSrch points to string to search for
 * returns   last occurrence of string if successful; NULL otherwise
 */
LPSTR StrRStrIA(LPCSTR lpSource, LPCSTR lpLast, LPCSTR lpSrch)
{
    LPCSTR lpFound = NULL;

    RIPMSG(lpSource && IS_VALID_STRING_PTRA(lpSource, -1), "StrRStrIA: Caller passed bad lpSource");
    RIPMSG(!lpLast || (IS_VALID_STRING_PTRA(lpLast, -1) && lpLast>=lpSource && lpLast<=lpSource+lstrlenA(lpSource)), "StrRStrIA: Caller passed bad lpLast");
    RIPMSG(lpSrch && IS_VALID_STRING_PTRA(lpSrch, -1) && *lpSrch, "StrRStrIA: Caller passed bad lpSrch");

    if (!lpLast)
        lpLast = lpSource + lstrlenA(lpSource);

    if (lpSource && lpSrch && *lpSrch)
    {
        WORD   wMatch;
        UINT   uLen;
        LPCSTR  lpStart;
        
        wMatch = READNATIVEWORD(lpSrch);
        wMatch = (UINT)(IsDBCSLeadByte(LOBYTE(wMatch)) ? wMatch : LOBYTE(wMatch));
        
        uLen = lstrlenA(lpSrch);
        lpStart = lpSource;
        while (*lpStart && (lpStart < lpLast))
        {
            if (!ChrCmpIA(READNATIVEWORD(lpStart), wMatch))
            {   
                if (StrCmpNIA(lpStart, lpSrch, uLen) == 0)
                    lpFound = lpStart;
            }   
            lpStart = AnsiNext(lpStart);
        }
    }
    return((LPSTR)lpFound);
}

LPWSTR StrRStrIW(LPCWSTR lpSource, LPCWSTR lpLast, LPCWSTR lpSrch)
{
    LPCWSTR lpFound = NULL;

    RIPMSG(lpSource && IS_VALID_STRING_PTRW(lpSource, -1), "StrRStrIW: Caller passed bad lpSource");
    RIPMSG(!lpLast || (IS_VALID_STRING_PTRW(lpLast, -1) && lpLast>=lpSource && lpLast<=lpSource+lstrlenW(lpSource)), "StrRStrIW: Caller passed bad lpLast");
    RIPMSG(lpSrch && IS_VALID_STRING_PTRW(lpSrch, -1) && *lpSrch, "StrRStrIW: Caller passed bad lpSrch");

    if (!lpLast)
        lpLast = lpSource + lstrlenW(lpSource);

    if (lpSource && lpSrch && *lpSrch)
    {
        WCHAR   wMatch;
        UINT    uLen;
        LPCWSTR  lpStart;

        wMatch = *lpSrch;
        uLen = lstrlenW(lpSrch);
        lpStart = lpSource;
        while (*lpStart && (lpStart < lpLast))
        {
            if (!ChrCmpIW(*lpStart, wMatch))
            {   
                if (StrCmpNIW(lpStart, lpSrch, uLen) == 0)
                    lpFound = lpStart;
            }   
            lpStart++;
        }
    }
    return((LPWSTR)lpFound);
}

/*
 * StrStr      - Search for first occurrence of a substring
 *
 * Assumes   lpSource points to source string
 *           lpSrch points to string to search for
 * returns   first occurrence of string if successful; NULL otherwise
 */
LPSTR StrStrA(LPCSTR lpFirst, LPCSTR lpSrch)
{
    RIPMSG(lpFirst && IS_VALID_STRING_PTRA(lpFirst, -1), "StrStrA: Caller passed bad lpFirst");
    RIPMSG(lpSrch && IS_VALID_STRING_PTRA(lpSrch, -1), "StrStrA: Caller passed bad lpSrch");

    if (lpFirst && lpSrch)
    {
        UINT uLen;
        WORD wMatch;
        CPINFO cpinfo;
        BOOL fMBCS = GetCPInfo(CP_ACP, &cpinfo) && cpinfo.LeadByte[0];

        uLen = (UINT)lstrlenA(lpSrch);
        wMatch = READNATIVEWORD(lpSrch);

        for ( ; (lpFirst=_StrChrA(lpFirst, wMatch, fMBCS))!=0 && _StrCmpNA(lpFirst, lpSrch, uLen, fMBCS);
             lpFirst=AnsiNext(lpFirst))
            continue; /* continue until we hit the end of the string or get a match */
        return((LPSTR)lpFirst);
    }
    return(NULL);
}

LPWSTR StrStrW(LPCWSTR lpFirst, LPCWSTR lpSrch)
{
    RIPMSG(lpFirst && IS_VALID_STRING_PTRW(lpFirst, -1), "StrStrW: Caller passed bad lpFirst");
    RIPMSG(lpSrch && IS_VALID_STRING_PTRW(lpSrch, -1), "StrStrW: Caller passed bad lpSrch");

    if (lpFirst && lpSrch)
    {
        UINT uLen;
        WCHAR wMatch;

        uLen = (UINT)lstrlenW(lpSrch);
        wMatch = *lpSrch;

        for ( ; (lpFirst=StrChrW(lpFirst, wMatch))!=0 && StrCmpNW(lpFirst, lpSrch, uLen);
             lpFirst++)
            continue; /* continue until we hit the end of the string or get a match */

        return (LPWSTR)lpFirst;
    }
    return NULL;
}

/*
 * StrStrN     - Search for first occurrence of a substring
 *
 * Assumes   lpSource points to source string
 *           lpSrch points to string to search for
 * returns   first occurrence of string if successful; NULL otherwise
 */
 
LPWSTR StrStrNW(LPCWSTR lpFirst, LPCWSTR lpSrch, UINT cchMax)
{
    RIPMSG(lpFirst && IS_VALID_STRING_PTRW(lpFirst, cchMax), "StrStrW: Caller passed bad lpFirst");
    RIPMSG(lpSrch && IS_VALID_STRING_PTRW(lpSrch, cchMax), "StrStrW: Caller passed bad lpSrch");
    if (lpFirst && lpSrch)
    {
        UINT uLen;
        WCHAR wMatch;
        LPCWSTR lpSentinel = lpFirst+cchMax;

        uLen = (UINT)lstrlenW(lpSrch);
        wMatch = *lpSrch;

        // the first two conditions in this loop signify failure when they eval to false,
        // while the third condition signifies success. We need to special case the second
        // condition at the end of the function because it doesn't automatically cause the
        // right value to be returned
        while((lpFirst=StrChrNW(lpFirst, wMatch, cchMax))!=0 && cchMax>=uLen &&StrCmpNW(lpFirst, lpSrch, uLen))
        {
            lpFirst++;
            cchMax=(UINT)(lpSentinel-lpFirst);
        }/* continue until we hit the end of the string or get a match */

        if(cchMax<uLen)
            return NULL;// we ran out of space
        return (LPWSTR)lpFirst;
    }
    return NULL;
}

/*
 * StrStrI   - Search for first occurrence of a substring, case insensitive
 *
 * Assumes   lpFirst points to source string
 *           lpSrch points to string to search for
 * returns   first occurrence of string if successful; NULL otherwise
 */
LPSTR StrStrIA(LPCSTR lpFirst, LPCSTR lpSrch)
{
    RIPMSG(lpFirst && IS_VALID_STRING_PTRA(lpFirst, -1), "StrStrIA: Caller passed bad lpFirst");
    RIPMSG(lpSrch && IS_VALID_STRING_PTRA(lpSrch, -1), "StrStrIA: Caller passed bad lpSrch");
    if (lpFirst && lpSrch)
    {
        UINT uLen = (UINT)lstrlenA(lpSrch);
        WORD wMatch = READNATIVEWORD(lpSrch);

        for ( ; (lpFirst = StrChrIA(lpFirst, wMatch)) != 0 && StrCmpNIA(lpFirst, lpSrch, uLen);
             lpFirst=AnsiNext(lpFirst))
            continue; /* continue until we hit the end of the string or get a match */

        return (LPSTR)lpFirst;
    }
    return NULL;
}

LPWSTR StrStrIW(LPCWSTR lpFirst, LPCWSTR lpSrch)
{
    RIPMSG(lpFirst && IS_VALID_STRING_PTRW(lpFirst, -1), "StrStrIW: Caller passed bad lpFirst");
    RIPMSG(lpSrch && IS_VALID_STRING_PTRW(lpSrch, -1), "StrStrIW: Caller passed bad lpSrch");
    if (lpFirst && lpSrch)
    {
        UINT uLen = (UINT)lstrlenW(lpSrch);
        WCHAR wMatch = *lpSrch;

        for ( ; (lpFirst = StrChrIW(lpFirst, wMatch)) != 0 && StrCmpNIW(lpFirst, lpSrch, uLen);
             lpFirst++)
            continue; /* continue until we hit the end of the string or get a match */

        return (LPWSTR)lpFirst;
    }
    return NULL;
}

/*
 * StrStrNI   - Search for first occurrence of a substring, case insensitive, counted
 *
 * Assumes   lpFirst points to source string
 *           lpSrch points to string to search for
 * returns   first occurrence of string if successful; NULL otherwise
 */

LPWSTR StrStrNIW(LPCWSTR lpFirst, LPCWSTR lpSrch, UINT cchMax)
{
    RIPMSG(lpFirst && IS_VALID_STRING_PTRW(lpFirst, cchMax), "StrStrNIW: Caller passed bad lpFirst");
    RIPMSG(lpSrch && IS_VALID_STRING_PTRW(lpSrch, cchMax), "StrStrNIW: Caller passed bad lpSrch");
    if (lpFirst && lpSrch)
    {
        UINT uLen = (UINT)lstrlenW(lpSrch);
        WCHAR wMatch = *lpSrch;
        LPCWSTR lpSentinel = lpFirst+cchMax;

        // the first two conditions in this loop signify failure when they eval to false,
        // while the third condition signifies success. We need to special case the second
        // condition at the end of the function because it doesn't automatically cause the
        // right value to be returned
        while((lpFirst = StrChrNIW(lpFirst, wMatch, cchMax)) != 0 && cchMax >= uLen && StrCmpNIW(lpFirst, lpSrch, uLen))
        {
            lpFirst++;
            cchMax = (UINT)(lpSentinel - lpFirst);
        }/* continue until we hit the end of the string or get a match */

        if(cchMax<uLen)
            return NULL;// we ran out of space
        return (LPWSTR)lpFirst;
    }
    return NULL;
}


LPSTR StrDupA(LPCSTR psz)
{
    LPSTR pszRet = NULL;

    RIPMSG(psz && IS_VALID_STRING_PTRA(psz, -1), "StrDupA: Caller passed invalid psz");

    if (psz)
    {
        int cch = lstrlenA(psz) + 1;
        
        pszRet = (LPSTR)LocalAlloc(LPTR, cch * sizeof(char));
        if (pszRet)
        {
            StringCchCopyA(pszRet, cch, psz);
        }
    }

    return pszRet;
}

LPWSTR StrDupW(LPCWSTR psz)
{
    LPWSTR pszRet = NULL;

    RIPMSG(psz && IS_VALID_STRING_PTRW(psz, -1), "StrDupW: Caller passed invalid psz");

    if (psz)
    {
        int cch = lstrlenW(psz) + 1;

        pszRet = (LPWSTR)LocalAlloc(LPTR, cch * sizeof(WCHAR));
        if (pszRet)
        {
            StringCchCopyW(pszRet, cch, psz);
        }
    }

    return pszRet;
}

void _StrOut(LPSTR pszDest, int cchDest, HMODULE hmod, UINT idRes, DWORD* pdwTimeS, int* pdigits, UINT iDiv)
{
    *pszDest = '\0';

    if (*pdigits)
    {
        DWORD dwCur = *pdwTimeS/iDiv;

        if (dwCur || iDiv==1) 
        {
            DWORD dwBase;
            CHAR szBuf[64], szTemplate[64];
            LPSTR pszBuf = szBuf;

            *pdwTimeS -= dwCur*iDiv;
            for (dwBase=1; dwCur/(dwBase*10); dwBase*=10);

            DebugMsg(DM_INTERVAL, TEXT("dwCur, dwBase, *pdwTimeS = %d, %d, %d"), dwCur, dwBase, *pdwTimeS);

            //
            // LATER: We could use atoi if we mathematically trancate
            //  the numbers based on digits.
            //
            for (;dwBase; dwBase/=10, pszBuf++) 
            {
                if (*pdigits) 
                {
                    DWORD i = dwCur/dwBase;
                    dwCur -= i*dwBase;
                    *pszBuf = '0'+(unsigned short)i;
                    (*pdigits)--;
                } 
                else 
                {
                    *pszBuf = '0';
                }
            }
            *pszBuf = '\0';

            MLLoadStringA(idRes, szTemplate, ARRAYSIZE(szTemplate));
            StringCchPrintfA(pszDest, cchDest, szTemplate, szBuf);
        }
    }
}

void _StrOutW(LPWSTR pszDest, int cchDest, HMODULE hmod, UINT idRes, DWORD* pdwTimeS, int* pdigits, UINT iDiv)
{
    *pszDest = L'\0';

    if (*pdigits)
    {
        DWORD dwCur = *pdwTimeS/iDiv;

        if (dwCur || iDiv==1) 
        {
            DWORD dwBase;
            WCHAR wszBuf[64], wszTemplate[64];
            LPWSTR pwszBuf = wszBuf;

            *pdwTimeS -= dwCur*iDiv;
            for (dwBase=1; dwCur/(dwBase*10); dwBase*=10);

            DebugMsg(DM_INTERVAL, TEXT("dwCur, dwBase, *pdwTimeS = %d, %d, %d"), dwCur, dwBase, *pdwTimeS);

            //
            // LATER: We could use atoi if we mathematically trancate
            //  the numbers based on digits.
            //
            for (;dwBase; dwBase/=10, pwszBuf++) 
            {
                if (*pdigits) 
                {
                    DWORD i = dwCur/dwBase;
                    dwCur -= i*dwBase;
                    *pwszBuf = L'0'+(unsigned short)i;
                    (*pdigits)--;
                } 
                else 
                {
                    *pwszBuf = L'0';
                }
            }
            *pwszBuf = L'\0';

            MLLoadStringW(idRes, wszTemplate, ARRAYSIZE(wszTemplate));
            StringCchPrintfW(pszDest, cchDest, wszTemplate, wszBuf);
        }
    }
}


BOOL _StrFromTimeInterval(LPSTR pszBuf, int cchBuf, DWORD dwTimeMS, int digits)
{
    char szTemp[128];
    DWORD dwTimeS = (dwTimeMS+500)/1000;

    DebugMsg(DM_INTERVAL, TEXT("dwTimeS = %d"), dwTimeS);

    _StrOut(szTemp, ARRAYSIZE(szTemp), g_hinst, IDS_HOUR, &dwTimeS, &digits, 3600);
    StringCchCopyA(pszBuf, cchBuf, szTemp);

    _StrOut(szTemp, ARRAYSIZE(szTemp), g_hinst, IDS_MIN, &dwTimeS, &digits, 60);
    StringCchCatA(pszBuf, cchBuf, szTemp);

    _StrOut(szTemp, ARRAYSIZE(szTemp), g_hinst, IDS_SEC, &dwTimeS, &digits, 1);
    StringCchCatA(pszBuf, cchBuf, szTemp);

    return TRUE;
}

BOOL _StrFromTimeIntervalW(LPWSTR pwszBuf, int cchBuf, DWORD dwTimeMS, int digits)
{
    WCHAR szTemp[128];
    DWORD dwTimeS = (dwTimeMS+500)/1000;

    DebugMsg(DM_INTERVAL, TEXT("dwTimeS = %d"), dwTimeS);

    _StrOutW(szTemp, ARRAYSIZE(szTemp), g_hinst, IDS_HOUR, &dwTimeS, &digits, 3600);
    StringCchCopyW(pwszBuf, cchBuf, szTemp);

    _StrOutW(szTemp, ARRAYSIZE(szTemp), g_hinst, IDS_MIN, &dwTimeS, &digits, 60);
    StringCchCatW(pwszBuf, cchBuf, szTemp);

    _StrOutW(szTemp, ARRAYSIZE(szTemp), g_hinst, IDS_SEC, &dwTimeS, &digits, 1);
    StringCchCatW(pwszBuf, cchBuf, szTemp);

    return TRUE;
}


//
//  This API converts a given time-interval (in msec) into a human readable
// string.
//
// Parameters:
//  pszOut   -- Specifies the string buffer. NULL is valid to query size.
//  cchMax   -- Specifies the size of buffer in char/WCHAR
//  dwTimeMS -- Specifies the time interval in msec
//  digits   -- Specifies the minimum number of digits to be displayed
//
// Returns:
//  Number of characters in the buffer (not including the terminator).
//
// Exmaples:
//  dwTimeMS digits     output
//   34000     3         34 sec
//   34000     2         34 sec
//   34000     1         30 sec
//   74000     3         1 min 14 sec
//   74000     2         1 min 10 sec
//   74000     1         1 min
//
int StrFromTimeIntervalA(LPSTR pszOut, UINT cchMax, DWORD dwTimeMS, int digits)
{
    CHAR szBuf[256];
    int cchRet = 0;
    RIPMSG(!pszOut || IS_VALID_WRITE_BUFFER(pszOut, char, cchMax), "StrFromTimeIntervalA: Caller passed invalid pszOut");
    DEBUGWhackPathBufferA(pszOut, cchMax);
    if (_StrFromTimeInterval(szBuf, ARRAYSIZE(szBuf), dwTimeMS, digits)) 
    {
        if (pszOut) 
        {
            lstrcpynA(pszOut, szBuf, cchMax);
            cchRet = lstrlenA(pszOut);
        }
        else 
        {
            cchRet = lstrlenA(szBuf);
        }
    }
    return cchRet;
}

int StrFromTimeIntervalW(LPWSTR pwszOut, UINT cchMax, DWORD dwTimeMS, int digits)
{
    WCHAR wszBuf[256];
    int cchRet = 0;
    RIPMSG(!pwszOut || IS_VALID_WRITE_BUFFER(pwszOut, WCHAR, cchMax), "StrFromTimeIntervalW: Caller passed invalid pszOut");
    DEBUGWhackPathBufferW(pwszOut, cchMax);
    if (_StrFromTimeIntervalW(wszBuf, ARRAYSIZE(wszBuf), dwTimeMS, digits)) 
    {
        if (pwszOut) 
        {
            lstrcpynW(pwszOut, wszBuf, cchMax);
            cchRet = lstrlenW(pwszOut);
        }
        else 
        {
            cchRet = lstrlenW(wszBuf);
        }
    }
    return cchRet;
}

/*
 * IntlStrEq
 *
 * returns TRUE if strings are equal, FALSE if not
 */
BOOL StrIsIntlEqualA(BOOL fCaseSens, LPCSTR lpString1, LPCSTR lpString2, int nChar) 
{
    DWORD dwFlags = fCaseSens ? LOCALE_USE_CP_ACP : (NORM_IGNORECASE | LOCALE_USE_CP_ACP);

    RIPMSG(lpString1 && IS_VALID_STRING_PTRA(lpString1, nChar), "StrIsIntlEqualA: Caller passed invalid lpString1");
    RIPMSG(lpString2 && IS_VALID_STRING_PTRA(lpString2, nChar), "StrIsIntlEqualA: Caller passed invalid lpString2");
    RIPMSG(nChar >= -1, "StrIsIntlEqualA: Caller passed invalid nChar");

    dwFlags |= NORM_STOP_ON_NULL;   // only supported on NT
    return 0 == _StrCmpLocaleA(dwFlags, lpString1, nChar, lpString2, nChar);
}

BOOL StrIsIntlEqualW(BOOL fCaseSens, LPCWSTR psz1, LPCWSTR psz2, int nChar) 
{
    RIPMSG(psz1 && IS_VALID_STRING_PTRW(psz1, nChar), "StrIsIntlEqualW: Caller passed invalid psz1");
    RIPMSG(psz2 && IS_VALID_STRING_PTRW(psz2, nChar), "StrIsIntlEqualW: Caller passed invalid psz2");
    RIPMSG(nChar >= -1, "StrIsIntlEqualW: Caller passed invalid nChar");

    return 0 == _StrCmpLocaleW(fCaseSens ? NORM_STOP_ON_NULL : NORM_IGNORECASE | NORM_STOP_ON_NULL, 
        psz1, nChar, psz2, nChar);
}

// This is stolen from shell32 - util.c

#define LODWORD(_qw)    (DWORD)(_qw)

const short c_aOrders[] = {IDS_BYTES, IDS_ORDERKB, IDS_ORDERMB,
                          IDS_ORDERGB, IDS_ORDERTB, IDS_ORDERPB, IDS_ORDEREB};

void Int64ToStr(LONGLONG n, LPWSTR lpBuffer)
{
    WCHAR szTemp[40];
    LONGLONG  iChr;

    iChr = 0;

    do {
        szTemp[iChr++] = L'0' + (WCHAR)(n % 10);
        n = n / 10;
    } while (n != 0);

    do {
        iChr--;
        *lpBuffer++ = szTemp[iChr];
    } while (iChr != 0);

    *lpBuffer++ = L'\0';
}

//
//  Obtain NLS info about how numbers should be grouped.
//
//  The annoying thing is that LOCALE_SGROUPING and NUMBERFORMAT
//  have different ways of specifying number grouping.
//
//          LOCALE      NUMBERFMT      Sample   Country
//
//          3;0         3           1,234,567   United States
//          3;2;0       32          12,34,567   India
//          3           30           1234,567   ??
//
//  Not my idea.  That's the way it works.
//
//  Bonus treat - Win9x doesn't support complex number formats,
//  so we return only the first number.
//
UINT GetNLSGrouping(void)
{
    UINT grouping;
    LPWSTR psz;
    WCHAR szGrouping[32];

    // If no locale info, then assume Western style thousands
    if (!GetLocaleInfoW(LOCALE_USER_DEFAULT, LOCALE_SGROUPING, szGrouping, ARRAYSIZE(szGrouping)))
        return 3;

    grouping = 0;
    psz = szGrouping;
    for (;;)
    {
        if (*psz == L'0') break;             // zero - stop

        else if ((UINT)(*psz - L'0') < 10)   // digit - accumulate it
            grouping = grouping * 10 + (UINT)(*psz - L'0');

        else if (*psz)                      // punctuation - ignore it
            { }

        else                                // end of string, no "0" found
        {
            grouping = grouping * 10;       // put zero on end (see examples)
            break;                          // and finished
        }

        psz++;
    }
    return grouping;
}

// Sizes of various stringized numbers
#define MAX_INT64_SIZE  30              // 2^64 is less than 30 chars long
#define MAX_COMMA_NUMBER_SIZE   (MAX_INT64_SIZE + 10)

// takes a DWORD add commas etc to it and puts the result in the buffer
LPWSTR CommifyString(LONGLONG n, LPWSTR pszBuf, UINT cchBuf)
{
    WCHAR szNum[MAX_COMMA_NUMBER_SIZE], szSep[5];
    NUMBERFMTW nfmt;

    nfmt.NumDigits = 0;
    nfmt.LeadingZero = 0;
    nfmt.Grouping = GetNLSGrouping();
    GetLocaleInfoW(LOCALE_USER_DEFAULT, LOCALE_STHOUSAND, szSep, ARRAYSIZE(szSep));
    nfmt.lpDecimalSep = nfmt.lpThousandSep = szSep;
    nfmt.NegativeOrder = 0;

    Int64ToStr(n, szNum);

    if (GetNumberFormatW(LOCALE_USER_DEFAULT, 0, szNum, &nfmt, pszBuf, cchBuf) == 0)
        StrCpyNW(pszBuf, szNum, cchBuf);

    return pszBuf;
}

/* converts numbers into sort formats
 *      532     -> 523 bytes
 *      1340    -> 1.3KB
 *      23506   -> 23.5KB
 *              -> 2.4MB
 *              -> 5.2GB
 */

LPWSTR StrFormatByteSizeW(LONGLONG n, LPWSTR pszBuf, UINT cchBuf)
{
    RIPMSG(pszBuf && IS_VALID_WRITE_BUFFER(pszBuf, WCHAR, cchBuf), "StrFormatByteSizeW: Caller passed invalid pszBuf");
    DEBUGWhackPathBufferW(pszBuf, cchBuf);
    if (pszBuf)
    {
        WCHAR szWholeNum[32], szOrder[32];
        int iOrder;

        // If the size is less than 1024, then the order should be bytes we have nothing
        // more to figure out
        if (n < 1024) 
        {
            wnsprintfW(szWholeNum, ARRAYSIZE(szWholeNum), L"%d", LODWORD(n));
            iOrder = 0;
        }
        else
        {
            UINT uInt, uLen, uDec;
            WCHAR szFormat[8];

            // Find the right order
            for (iOrder = 1; iOrder < ARRAYSIZE(c_aOrders) -1 && n >= 1000L * 1024L; n >>= 10, iOrder++);
                /* do nothing */

            uInt = LODWORD(n >> 10);
            CommifyString(uInt, szWholeNum, ARRAYSIZE(szWholeNum));
            uLen = lstrlenW(szWholeNum);
            if (uLen < 3)
            {
                uDec = LODWORD(n - (LONGLONG)uInt * 1024L) * 1000 / 1024;
                // At this point, uDec should be between 0 and 1000
                // we want get the top one (or two) digits.
                uDec /= 10;
                if (uLen == 2)
                    uDec /= 10;

                // Note that we need to set the format before getting the
                // intl char.
                StringCchCopyW(szFormat, ARRAYSIZE(szFormat), L"%02d");

                szFormat[2] = TEXT('0') + 3 - uLen;
                GetLocaleInfoW(LOCALE_USER_DEFAULT, LOCALE_SDECIMAL,
                               szWholeNum + uLen, ARRAYSIZE(szWholeNum) - uLen);
                uLen = lstrlenW(szWholeNum);
                wnsprintfW(szWholeNum + uLen, ARRAYSIZE(szWholeNum) - uLen, szFormat, uDec);
            }
        }

        MLLoadStringW(c_aOrders[iOrder], szOrder, ARRAYSIZE(szOrder));
        wnsprintfW(pszBuf, cchBuf, szOrder, szWholeNum);
    }
    return pszBuf;
}

// dw - the nubmer to be converted
// pszBuf - buffer for the resulting string
// cchBuf - Max characters in Buffer

LPSTR StrFormatByteSize64A(LONGLONG dw, LPSTR pszBuf, UINT cchBuf)
{
    WCHAR szT[32];

    DEBUGWhackPathBuffer(pszBuf, cchBuf);

    StrFormatByteSizeW(dw, szT, SIZECHARS(szT));

    SHUnicodeToAnsi(szT, pszBuf, cchBuf);
    return pszBuf;
}

LPSTR StrFormatByteSizeA(DWORD dw, LPSTR pszBuf, UINT cchBuf)
{
    return StrFormatByteSize64A((LONGLONG)dw, pszBuf, cchBuf);
}

LPWSTR StrFormatKBSizeW(LONGLONG n, LPWSTR pszBuf, UINT cchBuf)
{
    RIPMSG(pszBuf && IS_VALID_WRITE_BUFFER(pszBuf, WCHAR, cchBuf), "StrFormatKBSizeW: Caller passed invalid pszBuf");
    DEBUGWhackPathBufferW(pszBuf, cchBuf);
    if (pszBuf)
    {
        static WCHAR s_szOrder[16] = {0};
        WCHAR szNum[64];

        if (s_szOrder[0] == TEXT('\0'))
            LoadStringW(HINST_THISDLL, IDS_ORDERKB, s_szOrder, ARRAYSIZE(s_szOrder));

        CommifyString((n + 1023) / 1024, szNum, ARRAYSIZE(szNum));

        wnsprintfW(pszBuf, cchBuf, s_szOrder, szNum);
    }
    return pszBuf;
}

LPSTR StrFormatKBSizeA(LONGLONG n, LPSTR pszBuf, UINT cchBuf)
{
    WCHAR szNum[64];

    DEBUGWhackPathBufferA(pszBuf, cchBuf);

    StrFormatKBSizeW(n, szNum, ARRAYSIZE(szNum));

    SHUnicodeToAnsi(szNum, pszBuf, cchBuf);
    return pszBuf;
}

//  Win95 does not support the wide-char version of lstrcmp, lstrcmpi
//  Wrapper for lstrcmpW so it works on Win95

int StrCmpW(LPCWSTR pwsz1, LPCWSTR pwsz2)
{
    RIPMSG(pwsz1 && IS_VALID_STRING_PTRW(pwsz1, -1), "StrCmpW: Caller passed invalid pwsz1");
    RIPMSG(pwsz2 && IS_VALID_STRING_PTRW(pwsz2, -1), "StrCmpW: Caller passed invalid pwsz2");

    return _StrCmpLocaleW(0, pwsz1, -1, pwsz2, -1);
}

// Wrapper for lstrcmpiW so it works on Win95

int StrCmpIW(LPCWSTR pwsz1, LPCWSTR pwsz2)
{
    RIPMSG(pwsz1 && IS_VALID_STRING_PTRW(pwsz1, -1), "StrCmpIW: Caller passed invalid pwsz1");
    RIPMSG(pwsz2 && IS_VALID_STRING_PTRW(pwsz2, -1), "StrCmpIW: Caller passed invalid pwsz2");

    return _StrCmpLocaleW(NORM_IGNORECASE, pwsz1, -1, pwsz2, -1);
}


/*----------------------------------------------------------
Purpose: Trim the string pszTrimMe of any leading or trailing
         characters that are in pszTrimChars.

Returns: TRUE if anything was stripped

*/
STDAPI_(BOOL) StrTrimA(IN OUT LPSTR pszTrimMe, LPCSTR pszTrimChars)
{
    BOOL bRet = FALSE;

    RIPMSG(pszTrimMe && IS_VALID_STRING_PTRA(pszTrimMe, -1), "StrTrimA: Caller passed invalid pszTrimMe");
    RIPMSG(pszTrimChars && IS_VALID_STRING_PTRA(pszTrimChars, -1), "StrTrimA: Caller passed invalid pszTrimChars");
    if (pszTrimMe && pszTrimChars)
    {
        LPSTR psz;
        LPSTR pszStartMeat;
        LPSTR pszMark = NULL;
    
        /* Trim leading characters. */
        
        psz = pszTrimMe;
        
        while (*psz && StrChrA(pszTrimChars, READNATIVEWORD(psz)))
            psz = CharNextA(psz);
        
        pszStartMeat = psz;
        
        /* Trim trailing characters. */
        
        // (The old algorithm used to start from the end and go
        // backwards, but that is piggy because DBCS version of
        // CharPrev iterates from the beginning of the string
        // on every call.)
        
        while (*psz)
        {
            if (StrChrA(pszTrimChars, READNATIVEWORD(psz)))
            {
                if (!pszMark)
                {
                    pszMark = psz;
                }
            }
            else
            {
                pszMark = NULL;
            }
            psz = CharNextA(psz);
        }
        
        // Any trailing characters to clip?
        if (pszMark)
        {
            // Yes
            *pszMark = '\0';
            bRet = TRUE;
        }
        
        /* Relocate stripped string. */
        
        if (pszStartMeat > pszTrimMe)
        {
            /* (+ 1) for null terminator. */
            MoveMemory(pszTrimMe, pszStartMeat, CbFromCchA(lstrlenA(pszStartMeat) + 1));
            bRet = TRUE;
        }
        else
            ASSERT(pszStartMeat == pszTrimMe);
        
        ASSERT(IS_VALID_STRING_PTRA(pszTrimMe, -1));
    }
    
    return bRet;
}


/*----------------------------------------------------------
Purpose: Trim the string pszTrimMe of any leading or trailing
         characters that are in pszTrimChars.

Returns: TRUE if anything was stripped

*/
STDAPI_(BOOL) StrTrimW(IN OUT LPWSTR  pszTrimMe, LPCWSTR pszTrimChars)
{
    BOOL bRet = FALSE;

    RIPMSG(pszTrimMe && IS_VALID_STRING_PTRW(pszTrimMe, -1), "StrTrimW: Caller passed invalid pszTrimMe");
    RIPMSG(pszTrimChars && IS_VALID_STRING_PTRW(pszTrimChars, -1), "StrTrimW: Caller passed invalid pszTrimChars");
    if (pszTrimMe && pszTrimChars)
    {
        LPWSTR psz;
        LPWSTR pszStartMeat;
        LPWSTR pszMark = NULL;
    
        /* Trim leading characters. */
        
        psz = pszTrimMe;
        
        while (*psz && StrChrW(pszTrimChars, *psz))
            psz++;
        
        pszStartMeat = psz;
        
        /* Trim trailing characters. */
        
        // (The old algorithm used to start from the end and go
        // backwards, but that is piggy because DBCS version of
        // CharPrev iterates from the beginning of the string
        // on every call.)
        
        while (*psz)
        {
            if (StrChrW(pszTrimChars, *psz))
            {
                if (!pszMark)
                {
                    pszMark = psz;
                }
            }
            else
            {
                pszMark = NULL;
            }
            psz++;
        }
        
        // Any trailing characters to clip?
        if (pszMark)
        {
            // Yes
            *pszMark = '\0';
            bRet = TRUE;
        }
        
        /* Relocate stripped string. */
        
        if (pszStartMeat > pszTrimMe)
        {
            /* (+ 1) for null terminator. */
            MoveMemory(pszTrimMe, pszStartMeat, CbFromCchW(lstrlenW(pszStartMeat) + 1));
            bRet = TRUE;
        }
        else
            ASSERT(pszStartMeat == pszTrimMe);
        
        ASSERT(IS_VALID_STRING_PTRW(pszTrimMe, -1));
    }
    
    return bRet;
}


/*----------------------------------------------------------
Purpose: Compare strings using C runtime (ASCII) collation rules.

Returns: < 0 if pch1 <  pch2
         = 0 if pch1 == pch2
         > 0 if pch1 >  pch2
*/
LWSTDAPI_(int) StrCmpNCA(LPCSTR pch1, LPCSTR pch2, int n)
{
    if (n == 0)
        return 0;

    while (--n && *pch1 && *pch1 == *pch2)
    {
        pch1++;
        pch2++;
    }

    return *(unsigned char *)pch1 - *(unsigned char *)pch2;
}

/*----------------------------------------------------------
Purpose: Compare strings using C runtime (ASCII) collation rules.

Returns: < 0 if pch1 <  pch2
         = 0 if pch1 == pch2
         > 0 if pch1 >  pch2

*/
LWSTDAPI_(int) StrCmpNCW(LPCWSTR pch1, LPCWSTR pch2, int n)
{
    if (n == 0)
        return 0;

    while (--n && *pch1 && *pch1 == *pch2)
    {
        pch1++;
        pch2++;
    }

    return *pch1 - *pch2;
}

/*----------------------------------------------------------
Purpose: Compare strings using C runtime (ASCII) collation rules.

Returns: < 0 if pch1 <  pch2
         = 0 if pch1 == pch2
         > 0 if pch1 >  pch2

*/
LWSTDAPI_(int) StrCmpNICA(LPCSTR pch1, LPCSTR pch2, int n)
{
    int ch1, ch2;

    if (n != 0)
    {
        do {

            ch1 = *pch1++;
            if (ch1 >= 'A' && ch1 <= 'Z')
                ch1 += 'a' - 'A';

            ch2 = *pch2++;
            if (ch2 >= 'A' && ch2 <= 'Z')
                ch2 += 'a' - 'A';

        } while ( --n && ch1 && (ch1 == ch2) );

        return ch1 - ch2;
    }
    else
    {
        return 0;
    }
}

/*----------------------------------------------------------
Purpose: Compare strings using C runtime (ASCII) collation rules.

Returns: < 0 if pch1 <  pch2
         = 0 if pch1 == pch2
         > 0 if pch1 >  pch2

*/
LWSTDAPI_(int) StrCmpNICW(LPCWSTR pch1, LPCWSTR pch2, int n)
{
    int ch1, ch2;

    if (n != 0)
    {

        do {

            ch1 = *pch1++;
            if (ch1 >= L'A' && ch1 <= L'Z')
                ch1 += L'a' - L'A';

            ch2 = *pch2++;
            if (ch2 >= L'A' && ch2 <= L'Z')
                ch2 += L'a' - L'A';

        } while ( --n && ch1 && (ch1 == ch2) );

        return ch1 - ch2;
    }
    else
    {
        return 0;
    }
}

/*----------------------------------------------------------
Purpose: Compare strings using C runtime (ASCII) collation rules.

Returns: < 0 if pch1 <  pch2
         = 0 if pch1 == pch2
         > 0 if pch1 >  pch2

*/
LWSTDAPI_(int) StrCmpCA(LPCSTR pch1, LPCSTR pch2)
{
    while (*pch1 && (*pch1 == *pch2))
    {
        ++pch1;
        ++pch2;
    }   

    return *(unsigned char *)pch1 - *(unsigned char *)pch2;
}

/*----------------------------------------------------------
Purpose: Compare strings using C runtime (ASCII) collation rules.

Returns: < 0 if pch1 <  pch2
         = 0 if pch1 == pch2
         > 0 if pch1 >  pch2

*/
LWSTDAPI_(int) StrCmpCW(LPCWSTR pch1, LPCWSTR pch2)
{
    while (*pch1 && (*pch1 == *pch2))
    {
        ++pch1;
        ++pch2;
    }   

    return *pch1 - *pch2;
}

/*----------------------------------------------------------
Purpose: Compare strings using C runtime (ASCII) collation rules.

Returns: < 0 if pch1 <  pch2
         = 0 if pch1 == pch2
         > 0 if pch1 >  pch2

*/
LWSTDAPI_(int) StrCmpICA(LPCSTR pch1, LPCSTR pch2)
{
    int ch1, ch2;

    do {

        ch1 = *pch1++;
        if (ch1 >= 'A' && ch1 <= 'Z')
            ch1 += 'a' - 'A';

        ch2 = *pch2++;
        if (ch2 >= 'A' && ch2 <= 'Z')
            ch2 += 'a' - 'A';

    } while (ch1 && (ch1 == ch2));

    return ch1 - ch2;
}

/*----------------------------------------------------------
Purpose: Compare strings using C runtime (ASCII) collation rules.

Returns: < 0 if pch1 <  pch2
         = 0 if pch1 == pch2
         > 0 if pch1 >  pch2

*/
LWSTDAPI_(int) StrCmpICW(LPCWSTR pch1, LPCWSTR pch2)
{
    int ch1, ch2;

    do {

        ch1 = *pch1++;
        if (ch1 >= L'A' && ch1 <= L'Z')
            ch1 += L'a' - L'A';

        ch2 = *pch2++;
        if (ch2 >= L'A' && ch2 <= L'Z')
            ch2 += L'a' - L'A';

    } while (ch1 && (ch1 == ch2));

    return ch1 - ch2;
}

LWSTDAPI StrRetToStrW(STRRET *psr, LPCITEMIDLIST pidl, WCHAR **ppsz)
{
    HRESULT hres = S_OK;

    switch (psr->uType)
    {
    case STRRET_WSTR:
        *ppsz = psr->pOleStr;
        psr->pOleStr = NULL;   // avoid alias
        hres = *ppsz ? S_OK : E_FAIL;
        break;

    case STRRET_OFFSET:
        hres = SHStrDupA(STRRET_OFFPTR(pidl, psr), ppsz);
        break;

    case STRRET_CSTR:
        hres = SHStrDupA(psr->cStr, ppsz);
        break;

    default:
        *ppsz = NULL;
        hres = E_FAIL;
    }
    return hres;
}

LWSTDAPI StrRetToBSTR(STRRET *psr, LPCITEMIDLIST pidl, BSTR *pbstr)
{
    switch (psr->uType)
    {
    case STRRET_WSTR:
    {
        LPWSTR psz = psr->pOleStr;
        psr->pOleStr = NULL;  // avoid alias
        *pbstr = SysAllocString(psz);
        CoTaskMemFree(psz);
        break;
    }
    case STRRET_OFFSET:
        *pbstr = SysAllocStringA(STRRET_OFFPTR(pidl, psr));
        break;

    case STRRET_CSTR:
        *pbstr = SysAllocStringA(psr->cStr);
        break;

    default:
        *pbstr = NULL;
        return E_FAIL;
    }

    return (*pbstr) ? S_OK : E_OUTOFMEMORY;

}


HRESULT DupWideToAnsi(LPCWSTR pwsz, LPSTR *ppsz)
{
    UINT cch = WideCharToMultiByte(CP_ACP, 0, pwsz, -1, NULL, 0, NULL, NULL) + 1;
    *ppsz = CoTaskMemAlloc(cch * sizeof(**ppsz));
    if (*ppsz)
    {
        SHUnicodeToAnsi(pwsz, *ppsz, cch);
        return S_OK;
    }
    return E_OUTOFMEMORY;
}

HRESULT DupAnsiToAnsi(LPCSTR psz, LPSTR *ppsz)
{
    int cch = lstrlenA(psz) + 1;

    *ppsz = (LPSTR)CoTaskMemAlloc(cch * sizeof(**ppsz));
    if (*ppsz) 
    {
        StringCchCopyA(*ppsz, cch, psz);
        return S_OK;
    }
    return E_OUTOFMEMORY;
}

LWSTDAPI StrRetToStrA(STRRET *psr, LPCITEMIDLIST pidl, CHAR **ppsz)
{
    HRESULT hres;
    LPWSTR pwsz;

    switch (psr->uType)
    {
    case STRRET_WSTR:
        hres = DupWideToAnsi(psr->pOleStr, ppsz);
        pwsz = psr->pOleStr;
        psr->pOleStr = NULL;   // avoid alias
        CoTaskMemFree(pwsz);
        break;

    case STRRET_OFFSET:
        hres = DupAnsiToAnsi(STRRET_OFFPTR(pidl, psr), ppsz);
        break;

    case STRRET_CSTR:
        hres = DupAnsiToAnsi(psr->cStr, ppsz);
        break;

    default:
        *ppsz = NULL;
        hres = E_FAIL;
    }
    return hres;
}

STDAPI StrRetToBufA(STRRET *psr, LPCITEMIDLIST pidl, LPSTR pszBuf, UINT cchBuf)
{
    HRESULT hres = E_FAIL;

    switch (psr->uType)
    {
    case STRRET_WSTR:
        {
            LPWSTR pszStr = psr->pOleStr;   // temp copy because SHUnicodeToAnsi may overwrite buffer
            if (pszStr)
            {
                SHUnicodeToAnsi(pszStr, pszBuf, cchBuf);
                CoTaskMemFree(pszStr);

                // Make sure no one thinks things are allocated still
                psr->uType = STRRET_CSTR;   
                psr->cStr[0] = 0;
                
                hres = S_OK;
            }
        }
        break;

    case STRRET_CSTR:
        SHAnsiToAnsi(psr->cStr, pszBuf, cchBuf);
        hres = S_OK;
        break;

    case STRRET_OFFSET:
        if (pidl)
        {
            SHAnsiToAnsi(STRRET_OFFPTR(pidl, psr), pszBuf, cchBuf);
            hres = S_OK;
        }
        break;
    }

    if (FAILED(hres) && cchBuf)
        *pszBuf = 0;

    return hres;
}

STDAPI StrRetToBufW(STRRET *psr, LPCITEMIDLIST pidl, LPWSTR pszBuf, UINT cchBuf)
{
    HRESULT hres = E_FAIL;
    
    switch (psr->uType)
    {
    case STRRET_WSTR:
        {
            LPWSTR pwszTmp = psr->pOleStr;
            if (pwszTmp)
            {
                StrCpyNW(pszBuf, pwszTmp, cchBuf);
                CoTaskMemFree(pwszTmp);

                // Make sure no one thinks things are allocated still
                psr->uType = STRRET_CSTR;   
                psr->cStr[0] = 0;
                
                hres = S_OK;
            }
        }
        break;

    case STRRET_CSTR:
        SHAnsiToUnicode(psr->cStr, pszBuf, cchBuf);
        hres = S_OK;
        break;

    case STRRET_OFFSET:
        if (pidl)
        {
            SHAnsiToUnicode(STRRET_OFFPTR(pidl, psr), pszBuf, cchBuf);
            hres = S_OK;
        }
        break;
    }

    if (FAILED(hres) && cchBuf)
        *pszBuf = 0;

    return hres;
}

// dupe a string using the task allocator for returing from a COM interface
//
STDAPI SHStrDupA(LPCSTR psz, WCHAR **ppwsz)
{
    WCHAR *pwsz;
    DWORD cch;

    RIPMSG(psz && IS_VALID_STRING_PTRA(psz, -1), "SHStrDupA: Caller passed invalid psz");

    if (psz)
    {
        cch = MultiByteToWideChar(CP_ACP, 0, psz, -1, NULL, 0);
        pwsz = (WCHAR *)CoTaskMemAlloc((cch + 1) * SIZEOF(WCHAR));
    }
    else
        pwsz = NULL;

    *((PVOID UNALIGNED64 *) ppwsz) = pwsz;

    if (pwsz)
    {
        MultiByteToWideChar(CP_ACP, 0, psz, -1, *ppwsz, cch);
        return S_OK;
    }
    return E_OUTOFMEMORY;
}

// dupe a string using the task allocator for returing from a COM interface
// Sometimes, due to structure packing, the pointer we get is not properly
// aligned for Win64, so we have to do UNALIGNED64.
//
STDAPI SHStrDupW(LPCWSTR psz, WCHAR **ppwsz)
{
    WCHAR *pwsz;
    int cb;

    RIPMSG(psz && IS_VALID_STRING_PTRW(psz, -1), "SHStrDupW: Caller passed invalid psz");

    if (psz)
    {
        cb = (lstrlenW(psz) + 1) * SIZEOF(WCHAR);
        pwsz = (WCHAR *)CoTaskMemAlloc(cb);
    }
    else
        pwsz = NULL;
    
    *((PVOID UNALIGNED64 *) ppwsz) = pwsz;

    if (pwsz)
    {
        CopyMemory(pwsz, psz, cb);
        return S_OK;
    }
    return E_OUTOFMEMORY;
}

 
STDAPI_(int) StrCmpLogicalW(PCWSTR psz1, PCWSTR psz2)
{
    int iRet = 0;
    int iCmpNum = 0;
    while (iRet == 0 && (*psz1 || *psz2))
    {
        int cch1 = 0;
        int cch2 = 0;
        BOOL fIsDigit1 = IS_DIGITW(*psz1);
        BOOL fIsDigit2 = IS_DIGITW(*psz2);
        ASSERT(fIsDigit1 == TRUE || fIsDigit1 == FALSE);
        ASSERT(fIsDigit2 == TRUE || fIsDigit2 == FALSE);
        //  using bit wise XOR as logical XOR
        //  if the numbers are mismatched then n
        if (fIsDigit1 ^ fIsDigit2)
        {
            iRet = _StrCmpLocaleW(NORM_IGNORECASE, psz1, -1, psz2, -1);
        }
        else if (fIsDigit1 && fIsDigit2)
        {
            int cchZero1 = 0;
            int cchZero2 = 0;

            // eat leading zeros
            while (*psz1 == TEXT('0'))
            {
                psz1++;
                cchZero1++;
            }

            while (*psz2 == TEXT('0'))
            {
                psz2++;
                cchZero2++;
            }
            
            while (IS_DIGITW(psz1[cch1])) 
                cch1++;

            while (IS_DIGITW(psz2[cch2])) 
                cch2++;

            if (cch1 != cch2)
            {
                iRet = cch1 > cch2 ? 1 : -1;
            }
            else 
            {
                //  remember the first numerical difference
                iRet = _StrCmpLocaleW(NORM_IGNORECASE, psz1, cch1, psz2, cch2);
                if (iRet == 0 && iCmpNum == 0 && cchZero1 != cchZero2)
                {
                    iCmpNum = cchZero2 > cchZero1 ? 1 : -1;
                }
            }
        }
        else
        {
            while (psz1[cch1] && !IS_DIGITW(psz1[cch1]))
                cch1++;

            while (psz2[cch2] && !IS_DIGITW(psz2[cch2]))
                cch2++;

            iRet = _StrCmpLocaleW(NORM_IGNORECASE, psz1, cch1, psz2, cch2);

        }

        //  at this point they should be numbers or terminators or different
        psz1 = &psz1[cch1];
        psz2 = &psz2[cch2];
    }

    if (iRet == 0 && iCmpNum)
        iRet = iCmpNum;
    
    return iRet;
}

STDAPI_(DWORD) StrCatChainW(LPWSTR pszDst, DWORD cchDst, DWORD ichAt, LPCWSTR pszSrc)
{
    RIPMSG(pszDst && IS_VALID_STRING_PTRW(pszDst, -1) && (DWORD)lstrlenW(pszDst)<cchDst && IS_VALID_WRITE_BUFFER(pszDst, WCHAR, cchDst), "StrCatChainW: Caller passed invalid pszDst");
    RIPMSG(pszSrc && IS_VALID_STRING_PTRW(pszSrc, -1), "StrCatChainW: Caller passed invalid pszSrc");
    
    if (ichAt == -1)
        ichAt = lstrlenW(pszDst);

    if (cchDst > 0)
    {
#ifdef DEBUG
        if (ichAt < cchDst)
            DEBUGWhackPathBufferW(pszDst+ichAt, cchDst-ichAt);
#endif
        while (ichAt < cchDst)
        {
            if (!(pszDst[ichAt] = *pszSrc++))
                break;
                
           ichAt++;
        }

        //  check to make sure we copied a NULL
        if (ichAt == cchDst)
            pszDst[ichAt-1] = 0;
    }

    return ichAt;
}