[444] | 1 | /* |
---|
| 2 | FUNCTION |
---|
| 3 | <<wcsstr>>---find a wide-character substring |
---|
| 4 | |
---|
| 5 | SYNOPSIS |
---|
| 6 | #include <wchar.h> |
---|
| 7 | wchar_t *wcsstr(const wchar_t *__restrict <[big]>, |
---|
| 8 | const wchar_t *__restrict <[little]>); |
---|
| 9 | |
---|
| 10 | DESCRIPTION |
---|
| 11 | The <<wcsstr>> function locates the first occurrence in the |
---|
| 12 | wide-character string pointed to by <[big]> of the sequence of |
---|
| 13 | wide characters (excluding the terminating null wide character) in the |
---|
| 14 | wide-character string pointed to by <[little]>. |
---|
| 15 | |
---|
| 16 | RETURNS |
---|
| 17 | On successful completion, <<wcsstr>> returns a pointer to the located |
---|
| 18 | wide-character string, or a null pointer if the wide-character string |
---|
| 19 | is not found. |
---|
| 20 | |
---|
| 21 | If <[little]> points to a wide-character string with zero length, |
---|
| 22 | the function returns <[big]>. |
---|
| 23 | |
---|
| 24 | PORTABILITY |
---|
| 25 | <<wcsstr>> is ISO/IEC 9899/AMD1:1995 (ISO C). |
---|
| 26 | |
---|
| 27 | */ |
---|
| 28 | |
---|
| 29 | /* $NetBSD: wcsstr.c,v 1.1 2000/12/23 23:14:37 itojun Exp $ */ |
---|
| 30 | |
---|
| 31 | /*- |
---|
| 32 | * Copyright (c)1999 Citrus Project, |
---|
| 33 | * All rights reserved. |
---|
| 34 | * |
---|
| 35 | * Redistribution and use in source and binary forms, with or without |
---|
| 36 | * modification, are permitted provided that the following conditions |
---|
| 37 | * are met: |
---|
| 38 | * 1. Redistributions of source code must retain the above copyright |
---|
| 39 | * notice, this list of conditions and the following disclaimer. |
---|
| 40 | * 2. Redistributions in binary form must reproduce the above copyright |
---|
| 41 | * notice, this list of conditions and the following disclaimer in the |
---|
| 42 | * documentation and/or other materials provided with the distribution. |
---|
| 43 | * |
---|
| 44 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
---|
| 45 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
---|
| 46 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
---|
| 47 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
---|
| 48 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
---|
| 49 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
---|
| 50 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
---|
| 51 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
---|
| 52 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
---|
| 53 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
---|
| 54 | * SUCH DAMAGE. |
---|
| 55 | * |
---|
| 56 | * citrus Id: wcsstr.c,v 1.2 2000/12/21 05:07:25 itojun Exp |
---|
| 57 | */ |
---|
| 58 | |
---|
| 59 | #include <_ansi.h> |
---|
| 60 | #include <stddef.h> |
---|
| 61 | #include <wchar.h> |
---|
| 62 | |
---|
| 63 | wchar_t * |
---|
| 64 | wcsstr (const wchar_t *__restrict big, |
---|
| 65 | const wchar_t *__restrict little) |
---|
| 66 | { |
---|
| 67 | const wchar_t *p; |
---|
| 68 | const wchar_t *q; |
---|
| 69 | const wchar_t *r; |
---|
| 70 | |
---|
| 71 | if (!*little) |
---|
| 72 | { |
---|
| 73 | /* LINTED interface specification */ |
---|
| 74 | return (wchar_t *) big; |
---|
| 75 | } |
---|
| 76 | if (wcslen (big) < wcslen (little)) |
---|
| 77 | return NULL; |
---|
| 78 | |
---|
| 79 | p = big; |
---|
| 80 | q = little; |
---|
| 81 | while (*p) |
---|
| 82 | { |
---|
| 83 | q = little; |
---|
| 84 | r = p; |
---|
| 85 | while (*q) |
---|
| 86 | { |
---|
| 87 | if (*r != *q) |
---|
| 88 | break; |
---|
| 89 | q++; |
---|
| 90 | r++; |
---|
| 91 | } |
---|
| 92 | if (!*q) |
---|
| 93 | { |
---|
| 94 | /* LINTED interface specification */ |
---|
| 95 | return (wchar_t *) p; |
---|
| 96 | } |
---|
| 97 | p++; |
---|
| 98 | } |
---|
| 99 | return NULL; |
---|
| 100 | } |
---|