/src/postgres/src/backend/utils/mb/wstrncmp.c
Line | Count | Source |
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 | 0 | { |
42 | 0 | if (n == 0) |
43 | 0 | return 0; |
44 | 0 | do |
45 | 0 | { |
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 | 0 | } |
53 | | |
54 | | int |
55 | | pg_char_and_wchar_strncmp(const char *s1, const pg_wchar *s2, size_t n) |
56 | 0 | { |
57 | 0 | if (n == 0) |
58 | 0 | return 0; |
59 | 0 | do |
60 | 0 | { |
61 | 0 | if ((pg_wchar) ((unsigned char) *s1) != *s2++) |
62 | 0 | return ((pg_wchar) ((unsigned char) *s1) - *(s2 - 1)); |
63 | 0 | if (*s1++ == 0) |
64 | 0 | break; |
65 | 0 | } while (--n != 0); |
66 | 0 | return 0; |
67 | 0 | } |
68 | | |
69 | | size_t |
70 | | pg_wchar_strlen(const pg_wchar *str) |
71 | 0 | { |
72 | 0 | const pg_wchar *s; |
73 | |
|
74 | 0 | for (s = str; *s; ++s) |
75 | 0 | ; |
76 | 0 | return (s - str); |
77 | 0 | } |