greenplumn wstrncmp 源码
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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