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
pg_wchar_strncmp(const pg_wchar * s1,const pg_wchar * s2,size_t n)40 pg_wchar_strncmp(const pg_wchar *s1, const pg_wchar *s2, size_t n)
41 {
42 if (n == 0)
43 return 0;
44 do
45 {
46 if (*s1 != *s2++)
47 return (*s1 - *(s2 - 1));
48 if (*s1++ == 0)
49 break;
50 } while (--n != 0);
51 return 0;
52 }
53
54 int
pg_char_and_wchar_strncmp(const char * s1,const pg_wchar * s2,size_t n)55 pg_char_and_wchar_strncmp(const char *s1, const pg_wchar *s2, size_t n)
56 {
57 if (n == 0)
58 return 0;
59 do
60 {
61 if ((pg_wchar) ((unsigned char) *s1) != *s2++)
62 return ((pg_wchar) ((unsigned char) *s1) - *(s2 - 1));
63 if (*s1++ == 0)
64 break;
65 } while (--n != 0);
66 return 0;
67 }
68
69 size_t
pg_wchar_strlen(const pg_wchar * str)70 pg_wchar_strlen(const pg_wchar *str)
71 {
72 const pg_wchar *s;
73
74 for (s = str; *s; ++s)
75 ;
76 return (s - str);
77 }
78