93 lines
2.7 KiB
C
93 lines
2.7 KiB
C
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//////////////////////////////////////////////////////////////////////////////////////////////////
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//
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// strstr.c
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//
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// This file contains most commonly used string operation. ALl the setup project should link here
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// or add the common utility here to avoid duplicating code everywhere or using CRT runtime.
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//
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// Created 4\15\997 inateeg got from shlwapi
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//
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///////////////////////////////////////////////////////////////////////////////////////////////////
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#include <windows.h>
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#include "sdsutils.h"
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//=================================================================================================
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//
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//=================================================================================================
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/*
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* StrCmpN - Compare n bytes
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*
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* returns See lstrcmp return values.
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*/
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int
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StrCmpNA(
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LPCSTR lpStr1,
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LPCSTR lpStr2,
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int nChar)
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{
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LPCSTR lpszEnd = lpStr1 + nChar;
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for ( ; (lpszEnd > lpStr1) && (*lpStr1 || *lpStr2); lpStr1 = AnsiNext(lpStr1), lpStr2 = AnsiNext(lpStr2)) {
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WORD w1;
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WORD w2;
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// If either pointer is at the null terminator already,
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// we want to copy just one byte to make sure we don't read
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// past the buffer (might be at a page boundary).
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w1 = (*lpStr1) ? *(UNALIGNED WORD *)lpStr1 : 0;
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w2 = (*lpStr2) ? *(UNALIGNED WORD *)lpStr2 : 0;
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// (ChrCmpA returns FALSE if the characters match)
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// Do the characters match?
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if (ChrCmpA_inline(w1, w2))
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{
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// No; determine the lexical value of the comparison
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// (since ChrCmp just returns true/false).
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char sz1[4];
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char sz2[4];
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// Since the character may be a DBCS character; we
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// copy two bytes into each temporary buffer
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// (in preparation for the lstrcmp call).
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(*(WORD *)sz1) = w1;
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(*(WORD *)sz2) = w2;
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// Add null terminators to temp buffers
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*AnsiNext(sz1) = 0;
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*AnsiNext(sz2) = 0;
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return lstrcmpA(sz1, sz2);
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}
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}
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return 0;
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}
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/*
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* ANSIStrStr - Search for first occurrence of a substring
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*
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* Assumes lpSource points to source string
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* lpSrch points to string to search for
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* returns first occurrence of string if successful; NULL otherwise
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*/
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PSTR ANSIStrStr(LPCSTR lpFirst, LPCSTR lpSrch)
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{
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UINT uLen;
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WORD wMatch;
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uLen = (UINT)lstrlen(lpSrch);
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wMatch = *(UNALIGNED WORD FAR *)lpSrch;
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for ( ; (lpFirst=ANSIStrChr(lpFirst, wMatch))!=0 && StrCmpNA(lpFirst, lpSrch, uLen);
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lpFirst=AnsiNext(lpFirst))
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continue; /* continue until we hit the end of the string or get a match */
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return((LPSTR)lpFirst);
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}
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