Function V_strnistr

src/vstdlib/strtools.cpp:61–112

----------------------------------------------------------------------------- Finds a string in another string with a case insensitive test w/ length validation -----------------------------------------------------------------------------

// Finds a string in another string with a case insensitive test w/ length validation
//-----------------------------------------------------------------------------
char const* V_strnistr( char const* pStr, char const* pSearch, int n )
{
	Assert( pStr != NULL );
	Assert( pSearch != NULL );

	if ( pStr == NULL || pSearch == NULL ) 
		return 0;

	char const* pLetter = pStr;

	// Check the entire string
	while ( *pLetter != 0 )
	{
		if ( n <= 0 )
			return 0;

		// Skip over non-matches
		if ( tolower( *pLetter ) == tolower( *pSearch ) )
		{
			int n1 = n - 1;

			// Check for match
			char const* pMatch = pLetter + 1;
			char const* pTest = pSearch + 1;
			while (*pTest != 0)
			{
				if ( n1 <= 0 )
					return 0;

				// We've run off the end; don't bother.
				if (*pMatch == 0)
					return 0;

				if ( tolower( *pMatch ) != tolower( *pTest ) )
					break;

				++pMatch;
				++pTest;
				--n1;
			}

			// Found a match!
			if (*pTest == 0)
				return pLetter;
		}

		++pLetter;
		--n;
	}

	return 0;
}

const char* V_strnchr( const char* pStr, char c, int n )
{