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wstrncmp.c
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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 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
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
71 {
72  const pg_wchar *s;
73 
74  for (s = str; *s; ++s)
75  ;
76  return (s - str);
77 }
size_t pg_wchar_strlen(const pg_wchar *str)
Definition: wstrncmp.c:70
int pg_wchar_strncmp(const pg_wchar *s1, const pg_wchar *s2, size_t n)
Definition: wstrncmp.c:40
char * s1
int pg_char_and_wchar_strncmp(const char *s1, const pg_wchar *s2, size_t n)
Definition: wstrncmp.c:55
unsigned int pg_wchar
Definition: mbprint.c:31
char * s2