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b168057a | 1 | /* Copyright (C) 1995-2015 Free Software Foundation, Inc. |
33a934a3 UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995. | |
a482b5a5 | 4 | |
33a934a3 | 5 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
a482b5a5 | 9 | |
33a934a3 UD |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
a482b5a5 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
a482b5a5 | 18 | |
299a95b9 | 19 | #include <wchar.h> |
a482b5a5 RM |
20 | |
21 | ||
22 | /* Copy no more than N wide-characters of SRC to DEST. */ | |
23 | wchar_t * | |
8215c9ec | 24 | __wcsncpy (dest, src, n) |
299a95b9 RM |
25 | wchar_t *dest; |
26 | const wchar_t *src; | |
27 | size_t n; | |
a482b5a5 | 28 | { |
75cd5204 | 29 | wint_t c; |
299a95b9 | 30 | wchar_t *const s = dest; |
a482b5a5 RM |
31 | |
32 | --dest; | |
33 | ||
34 | if (n >= 4) | |
35 | { | |
36 | size_t n4 = n >> 2; | |
37 | ||
38 | for (;;) | |
39 | { | |
40 | c = *src++; | |
41 | *++dest = c; | |
42 | if (c == L'\0') | |
43 | break; | |
44 | c = *src++; | |
45 | *++dest = c; | |
46 | if (c == L'\0') | |
47 | break; | |
48 | c = *src++; | |
49 | *++dest = c; | |
50 | if (c == L'\0') | |
51 | break; | |
52 | c = *src++; | |
53 | *++dest = c; | |
54 | if (c == L'\0') | |
55 | break; | |
56 | if (--n4 == 0) | |
57 | goto last_chars; | |
58 | } | |
59 | n = n - (dest - s) - 1; | |
60 | if (n == 0) | |
61 | return s; | |
62 | goto zero_fill; | |
63 | } | |
64 | ||
65 | last_chars: | |
66 | n &= 3; | |
67 | if (n == 0) | |
68 | return s; | |
69 | ||
70 | do | |
71 | { | |
72 | c = *src++; | |
73 | *++dest = c; | |
74 | if (--n == 0) | |
75 | return s; | |
76 | } | |
77 | while (c != L'\0'); | |
78 | ||
79 | zero_fill: | |
80 | do | |
81 | *++dest = L'\0'; | |
82 | while (--n > 0); | |
83 | ||
84 | return s; | |
85 | } | |
8215c9ec | 86 | weak_alias (__wcsncpy, wcsncpy) |