Line data    Source code

       1             : /*
       2             :  * src/backend/utils/mb/wstrncmp.c
       3             :  *
       4             :  *
       5             :  * Copyright (c) 1989, 1993
       6             :  *  The Regents of the University of California.  All rights reserved.
       7             :  *
       8             :  * This code is derived from FreeBSD 2.2.1-RELEASE software.
       9             :  *
      10             :  * Redistribution and use in source and binary forms, with or without
      11             :  * modification, are permitted provided that the following conditions
      12             :  * are met:
      13             :  * 1. Redistributions of source code must retain the above copyright
      14             :  *    notice, this list of conditions and the following disclaimer.
      15             :  * 2. Redistributions in binary form must reproduce the above copyright
      16             :  *    notice, this list of conditions and the following disclaimer in the
      17             :  *    documentation and/or other materials provided with the distribution.
      18             :  * 3. Neither the name of the University nor the names of its contributors
      19             :  *    may be used to endorse or promote products derived from this software
      20             :  *    without specific prior written permission.
      21             :  *
      22             :  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
      23             :  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
      24             :  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
      25             :  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
      26             :  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
      27             :  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
      28             :  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
      29             :  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
      30             :  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
      31             :  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
      32             :  * SUCH DAMAGE.
      33             :  */
      34             : /* can be used in either frontend or backend */
      35             : #include "postgres_fe.h"
      36             : 
      37             : #include "mb/pg_wchar.h"
      38             : 
      39             : int
      40           0 : pg_wchar_strncmp(const pg_wchar *s1, const pg_wchar *s2, size_t n)
      41             : {
      42           0 :     if (n == 0)
      43           0 :         return 0;
      44             :     do
      45             :     {
      46           0 :         if (*s1 != *s2++)
      47           0 :             return (*s1 - *(s2 - 1));
      48           0 :         if (*s1++ == 0)
      49           0 :             break;
      50           0 :     } while (--n != 0);
      51           0 :     return 0;
      52             : }
      53             : 
      54             : int
      55          73 : pg_char_and_wchar_strncmp(const char *s1, const pg_wchar *s2, size_t n)
      56             : {
      57          73 :     if (n == 0)
      58           0 :         return 0;
      59             :     do
      60             :     {
      61         145 :         if ((pg_wchar) ((unsigned char) *s1) != *s2++)
      62          55 :             return ((pg_wchar) ((unsigned char) *s1) - *(s2 - 1));
      63          90 :         if (*s1++ == 0)
      64           0 :             break;
      65          90 :     } while (--n != 0);
      66          18 :     return 0;
      67             : }
      68             : 
      69             : size_t
      70           0 : pg_wchar_strlen(const pg_wchar *str)
      71             : {
      72             :     const pg_wchar *s;
      73             : 
      74           0 :     for (s = str; *s; ++s)
      75             :         ;
      76           0 :     return (s - str);
      77             : }