Function allSpaces

src/jrd/intl.cpp:1253–1304

static bool allSpaces(CharSet* charSet, const BYTE* ptr, ULONG len, ULONG offset)
{
/**************************************
 *
 *      a l l _ s p a c e s
 *
 **************************************
 *
 * Functional description
 *      determine if the string at ptr[offset] ... ptr[len] is entirely
 *      spaces, as per the space definition of (charset).
 *      The binary representation of a Space is character-set dependent.
 *      (0x20 for Ascii, 0x0020 for Unicode, 0x20 for SJIS, but must watch for
 *      0x??20, which is NOT a space.
 **************************************/
	fb_assert(ptr != NULL);

	// We are assuming offset points to the first byte which was not
	// consumed in a conversion.  And that offset is pointing
	// to a character boundary

	// Single-octet character sets are optimized here

	if (charSet->getSpaceLength() == 1)
	{
		const BYTE* p = &ptr[offset];
		const BYTE* const end = &ptr[len];
		while (p < end)
		{
			if (*p++ != *charSet->getSpace())
				return false;
		}
	}
	else
	{
		const BYTE* p = &ptr[offset];
		const BYTE* const end = &ptr[len];
		const unsigned char* space = charSet->getSpace();
		const unsigned char* const end_space = &space[charSet->getSpaceLength()];
		while (p < end)
		{
			space = charSet->getSpace();
			while (p < end && space < end_space)
			{
				if (*p++ != *space++)
					return false;
			}
		}
	}

	return true;
}


static int blocking_ast_collation(void* ast_object)