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