TLA  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 UBC           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 CBC         837 : pg_char_and_wchar_strncmp(const char *s1, const pg_wchar *s2, size_t n)
      56                 : {
      57             837 :     if (n == 0)
      58 UBC           0 :         return 0;
      59                 :     do
      60                 :     {
      61 CBC        1391 :         if ((pg_wchar) ((unsigned char) *s1) != *s2++)
      62             704 :             return ((pg_wchar) ((unsigned char) *s1) - *(s2 - 1));
      63             687 :         if (*s1++ == 0)
      64 UBC           0 :             break;
      65 CBC         687 :     } while (--n != 0);
      66             133 :     return 0;
      67                 : }
      68                 : 
      69                 : size_t
      70 UBC           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                 : }