356 lines
7.2 KiB
C
356 lines
7.2 KiB
C
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#define UNICODE 1
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#include "shellprv.h"
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#pragma hdrstop
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/*
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* StrEndN - Find the end of a string, but no more than n bytes
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* Assumes lpStart points to start of null terminated string
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* nBufSize is the maximum length
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* returns ptr to just after the last byte to be included
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*/
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LPWSTR StrEndNW(LPCWSTR lpStart, int nBufSize)
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{
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LPCWSTR lpEnd;
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for (lpEnd = lpStart + nBufSize; *lpStart && lpStart < lpEnd; lpStart = CharNext(lpStart))
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{
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/* just getting to the end of the string */
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continue;
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}
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if (lpStart > lpEnd)
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{
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/* We can only get here if the last wchar before lpEnd was a lead byte
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*/
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lpStart -= 2;
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}
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return((LPWSTR)lpStart);
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}
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LPSTR StrEndNA(LPCSTR lpStart, int nBufSize)
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{
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LPCSTR lpEnd;
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for (lpEnd = lpStart + nBufSize; *lpStart && lpStart < lpEnd; lpStart = CharNextA(lpStart))
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{
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/* just getting to the end of the string */
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continue;
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}
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if (lpStart > lpEnd)
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{
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// We can only get here if the last byte before lpEnd was a lead byte
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lpStart -= 2;
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}
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return (LPSTR)lpStart;
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}
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/*
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* StrCpyN - Copy up to N chars, don't end in LeadByte char
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*
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* Assumes lpDest points to buffer of nBufSize bytes (including NULL)
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* lpSource points to string to be copied.
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* returns Number of bytes copied, NOT including NULL
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*/
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int Shell32_StrCpyNW(LPWSTR lpDest, LPWSTR lpSource, int nBufSize)
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{
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LPWSTR lpEnd;
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WCHAR cHold;
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if (nBufSize < 0)
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return(nBufSize);
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lpEnd = StrEndNW(lpSource, nBufSize);
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cHold = *lpEnd;
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*lpEnd = WCHAR_NULL;
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lstrcpy(lpDest, lpSource);
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*lpEnd = cHold;
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return (int)(lpEnd - lpSource);
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}
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int Shell32_StrCpyNA(LPSTR lpDest, LPSTR lpSource, int nBufSize)
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{
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LPSTR lpEnd;
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CHAR cHold;
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if (nBufSize < 0)
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return(nBufSize);
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lpEnd = StrEndNA(lpSource, nBufSize);
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cHold = *lpEnd;
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*lpEnd = '\0';
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lstrcpyA(lpDest, lpSource);
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*lpEnd = cHold;
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return (int)(lpEnd - lpSource);
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}
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/*
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* StrNCmp - Compare n characters
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*
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* returns See lstrcmp return values.
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*/
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int StrNCmpW(LPWSTR lpStr1, LPWSTR lpStr2, int nChar)
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{
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WCHAR cHold1, cHold2;
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int i;
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LPWSTR lpsz1 = lpStr1, lpsz2 = lpStr2;
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for (i = 0; i < nChar; i++)
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{
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/* If we hit the end of either string before the given number
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* of bytes, just return the comparison
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*/
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if (!*lpsz1 || !*lpsz2)
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return(wcscmp(lpStr1, lpStr2));
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lpsz1 = CharNextW(lpsz1);
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lpsz2 = CharNextW(lpsz2);
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}
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cHold1 = *lpsz1;
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cHold2 = *lpsz2;
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*lpsz1 = *lpsz2 = WCHAR_NULL;
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i = wcscmp(lpStr1, lpStr2);
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*lpsz1 = cHold1;
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*lpsz2 = cHold2;
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return(i);
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}
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int StrNCmpA(LPSTR lpStr1, LPSTR lpStr2, int nChar)
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{
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CHAR cHold1, cHold2;
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int i;
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LPSTR lpsz1 = lpStr1, lpsz2 = lpStr2;
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for (i = 0; i < nChar; i++)
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{
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/* If we hit the end of either string before the given number
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* of bytes, just return the comparison
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*/
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if (!*lpsz1 || !*lpsz2)
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return(lstrcmpA(lpStr1, lpStr2));
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lpsz1 = CharNextA(lpsz1);
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lpsz2 = CharNextA(lpsz2);
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}
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cHold1 = *lpsz1;
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cHold2 = *lpsz2;
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*lpsz1 = *lpsz2 = '\0';
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i = lstrcmpA(lpStr1, lpStr2);
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*lpsz1 = cHold1;
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*lpsz2 = cHold2;
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return i;
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}
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/*
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* StrNCmpI - Compare n characters, case insensitive
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*
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* returns See lstrcmpi return values.
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*/
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int StrNCmpIW(LPWSTR lpStr1, LPWSTR lpStr2, int nChar)
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{
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WCHAR cHold1, cHold2;
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int i;
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LPWSTR lpsz1 = lpStr1, lpsz2 = lpStr2;
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for (i = 0; i < nChar; i++)
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{
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/* If we hit the end of either string before the given number
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* of bytes, just return the comparison
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*/
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if (!*lpsz1 || !*lpsz2)
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return(lstrcmpi(lpStr1, lpStr2));
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lpsz1 = CharNext(lpsz1);
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lpsz2 = CharNext(lpsz2);
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}
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cHold1 = *lpsz1;
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cHold2 = *lpsz2;
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*lpsz1 = *lpsz2 = WCHAR_NULL;
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i = _wcsicmp(lpStr1, lpStr2);
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*lpsz1 = cHold1;
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*lpsz2 = cHold2;
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return i;
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}
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int StrNCmpIA(LPSTR lpStr1, LPSTR lpStr2, int nChar)
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{
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CHAR cHold1, cHold2;
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int i;
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LPSTR lpsz1 = lpStr1, lpsz2 = lpStr2;
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for (i = 0; i < nChar; i++)
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{
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/* If we hit the end of either string before the given number
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* of bytes, just return the comparison
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*/
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if (!*lpsz1 || !*lpsz2)
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return(lstrcmpiA(lpStr1, lpStr2));
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lpsz1 = CharNextA(lpsz1);
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lpsz2 = CharNextA(lpsz2);
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}
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cHold1 = *lpsz1;
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cHold2 = *lpsz2;
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*lpsz1 = *lpsz2 = '\0';
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i = lstrcmpiA(lpStr1, lpStr2);
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*lpsz1 = cHold1;
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*lpsz2 = cHold2;
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return i;
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}
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/*
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* StrNCpy - Copy n characters
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*
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* returns Actual number of characters copied
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*/
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int StrNCpyW(LPWSTR lpDest, LPWSTR lpSource, int nChar)
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{
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WCHAR cHold;
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int i;
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LPWSTR lpch = lpSource;
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if (nChar < 0)
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return(nChar);
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for (i = 0; i < nChar; i++)
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{
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if (!*lpch)
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break;
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lpch = CharNext(lpch);
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}
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cHold = *lpch;
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*lpch = WCHAR_NULL;
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wcscpy(lpDest, lpSource);
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*lpch = cHold;
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return i;
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}
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int StrNCpyA(LPSTR lpDest, LPSTR lpSource,int nChar)
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{
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CHAR cHold;
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int i;
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LPSTR lpch = lpSource;
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if (nChar < 0)
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return(nChar);
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for (i = 0; i < nChar; i++)
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{
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if (!*lpch)
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break;
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lpch = CharNextA(lpch);
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}
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cHold = *lpch;
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*lpch = '\0';
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lstrcpyA(lpDest, lpSource);
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*lpch = cHold;
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return i;
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}
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/*
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* StrRStr - Search for last occurrence of a substring
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*
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* Assumes lpSource points to the null terminated source string
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* lpLast points to where to search from in the source string
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* lpLast is not included in the search
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* lpSrch points to string to search for
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* returns last occurrence of string if successful; NULL otherwise
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*/
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LPWSTR StrRStrW(LPWSTR lpSource, LPWSTR lpLast, LPWSTR lpSrch)
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{
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int iLen;
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iLen = lstrlen(lpSrch);
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if (!lpLast)
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{
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lpLast = lpSource + lstrlen(lpSource);
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}
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do
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{
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/* Return NULL if we hit the exact beginning of the string
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*/
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if (lpLast == lpSource)
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return(NULL);
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--lpLast;
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/* Break if we hit the beginning of the string
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*/
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if (!lpLast)
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break;
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/* Break if we found the string, and its first byte is not a tail byte
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*/
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if (!StrCmpNW(lpLast, lpSrch, iLen) && (lpLast==StrEndNW(lpSource, (int)(lpLast-lpSource))))
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break;
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}
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while (1);
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return lpLast;
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}
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LPSTR StrRStrA(LPSTR lpSource, LPSTR lpLast, LPSTR lpSrch)
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{
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int iLen;
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iLen = lstrlenA(lpSrch);
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if (!lpLast)
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{
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lpLast = lpSource + lstrlenA(lpSource);
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}
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do
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{
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/* Return NULL if we hit the exact beginning of the string
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*/
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if (lpLast == lpSource)
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return(NULL);
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--lpLast;
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/* Break if we hit the beginning of the string
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*/
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if (!lpLast)
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break;
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/* Break if we found the string, and its first byte is not a tail byte
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*/
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if (!StrCmpNA(lpLast, lpSrch, iLen) &&(lpLast==StrEndNA(lpSource, (int)(lpLast-lpSource))))
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{
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break;
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}
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}
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while (1);
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return lpLast;
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}
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