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wstrcmp.c

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00001 /*
00002  * src/backend/utils/mb/wstrcmp.c
00003  *
00004  *-
00005  * Copyright (c) 1990, 1993
00006  *  The Regents of the University of California.  All rights reserved.
00007  *
00008  * This code is derived from software contributed to Berkeley by
00009  * Chris Torek.
00010  *
00011  * Redistribution and use in source and binary forms, with or without
00012  * modification, are permitted provided that the following conditions
00013  * are met:
00014  * 1. Redistributions of source code must retain the above copyright
00015  *    notice, this list of conditions and the following disclaimer.
00016  * 2. Redistributions in binary form must reproduce the above copyright
00017  *    notice, this list of conditions and the following disclaimer in the
00018  *    documentation and/or other materials provided with the distribution.
00019  * 3. Neither the name of the University nor the names of its contributors
00020  *    may be used to endorse or promote products derived from this software
00021  *    without specific prior written permission.
00022  *
00023  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
00024  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00025  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00026  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
00027  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00028  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00029  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00030  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00031  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00032  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00033  * SUCH DAMAGE.
00034  */
00035 /* can be used in either frontend or backend */
00036 #include "postgres_fe.h"
00037 
00038 #include "mb/pg_wchar.h"
00039 
00040 int
00041 pg_char_and_wchar_strcmp(const char *s1, const pg_wchar *s2)
00042 {
00043     while ((pg_wchar) *s1 == *s2++)
00044         if (*s1++ == 0)
00045             return 0;
00046     return *(const unsigned char *) s1 - *(const pg_wchar *) (s2 - 1);
00047 }