greenplumn wstrncmp 源码

  • 2022-08-18
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greenplumn wstrncmp 代码

文件路径:/src/backend/utils/mb/wstrncmp.c

/*
 * src/backend/utils/mb/wstrncmp.c
 *
 *
 * Copyright (c) 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from FreeBSD 2.2.1-RELEASE software.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *	  notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *	  notice, this list of conditions and the following disclaimer in the
 *	  documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *	  may be used to endorse or promote products derived from this software
 *	  without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
/* can be used in either frontend or backend */
#include "postgres_fe.h"

#include "mb/pg_wchar.h"

int
pg_wchar_strncmp(const pg_wchar *s1, const pg_wchar *s2, size_t n)
{
	if (n == 0)
		return 0;
	do
	{
		if (*s1 != *s2++)
			return (*s1 - *(s2 - 1));
		if (*s1++ == 0)
			break;
	} while (--n != 0);
	return 0;
}

int
pg_char_and_wchar_strncmp(const char *s1, const pg_wchar *s2, size_t n)
{
	if (n == 0)
		return 0;
	do
	{
		if ((pg_wchar) ((unsigned char) *s1) != *s2++)
			return ((pg_wchar) ((unsigned char) *s1) - *(s2 - 1));
		if (*s1++ == 0)
			break;
	} while (--n != 0);
	return 0;
}

size_t
pg_wchar_strlen(const pg_wchar *str)
{
	const pg_wchar *s;

	for (s = str; *s; ++s)
		;
	return (s - str);
}

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