substring.cpp

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//---------------------------------------------------------------------------
//
// SubString.cpp: SubString Search Routines Implementation
//
//---------------------------------------------------------------------------

#include "StdAfx.h"
#include "SubString.h"

const char* szBaseString = "RightMark Memory Analyzer ";
const int BaseLength = strlen(szBaseString);
char szSubString[260];

void __cdecl GenerateSubString(DWORD len)
{
    // copy whole strings
    int i = 0;
    int l = int(len);
    while (l > BaseLength)
    {
        strncpy(&szSubString[i], szBaseString, BaseLength);
        i += BaseLength;
        l -= BaseLength;
    }

    // copy last bytes
    strncpy(&szSubString[i], szBaseString, l);

    // make the string null-terminated
    szSubString[len] = '\0';
}

char* __cdecl StrNStr(const char* Str, const char* SubStr, DWORD maxLen)
{
    for (char* start = (char *)Str; DWORD(start) < DWORD(Str) + maxLen; ++start)
    {
        // find start of pattern in string
        if (*start == *SubStr)
        {
            char* pptr = (char *)SubStr;
            char* sptr = start;

            while (*sptr++ == *pptr++)
            {
                // if end of pattern then pattern was found
                if ('\0' == *pptr)
                    return start;
            }
        }
        if (*start == '\0')
        {
            break;
        }
    }

    return NULL;
}

inline char ToUpper(char c)
{
    return ((c > char(0x60)) && (c < char(0x7b))) ? (c - 0x20) : c;
}

char* __cdecl StrNIStr(const char* Str, const char* SubStr, DWORD maxLen)
{
    for (char* start = (char *)Str; DWORD(start) < DWORD(Str) + maxLen; ++start)
    {
        // find start of pattern in string
        if (ToUpper(*start) == ToUpper(*SubStr))
        {
            char* pptr = (char *)SubStr;
            char* sptr = start;

            while (ToUpper(*sptr++) == ToUpper(*pptr++))
            {
                // if end of pattern then pattern was found
                if ('\0' == *pptr)
                    return start;
            }
        }
        if (*start == '\0')
        {
            break;
        }
    }

    return NULL;
}