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bfff8b1b | 1 | /* Copyright (C) 1995-2017 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 | 20 | |
e1fe9118 SL |
21 | #ifndef WCSNCAT |
22 | # define WCSNCAT wcsncat | |
23 | #endif | |
a482b5a5 RM |
24 | |
25 | /* Append no more than N wide-character of SRC onto DEST. */ | |
26 | wchar_t * | |
9d46370c | 27 | WCSNCAT (wchar_t *dest, const wchar_t *src, size_t n) |
a482b5a5 RM |
28 | { |
29 | wchar_t c; | |
30 | wchar_t * const s = dest; | |
31 | ||
32 | /* Find the end of DEST. */ | |
33 | do | |
34 | c = *dest++; | |
35 | while (c != L'\0'); | |
36 | ||
37 | /* Make DEST point before next character, so we can increment | |
38 | it while memory is read (wins on pipelined cpus). */ | |
39 | dest -= 2; | |
40 | ||
41 | if (n >= 4) | |
42 | { | |
43 | size_t n4 = n >> 2; | |
44 | do | |
45 | { | |
46 | c = *src++; | |
47 | *++dest = c; | |
48 | if (c == L'\0') | |
49 | return s; | |
50 | c = *src++; | |
51 | *++dest = c; | |
52 | if (c == L'\0') | |
53 | return s; | |
54 | c = *src++; | |
55 | *++dest = c; | |
56 | if (c == L'\0') | |
57 | return s; | |
58 | c = *src++; | |
59 | *++dest = c; | |
60 | if (c == L'\0') | |
61 | return s; | |
62 | } while (--n4 > 0); | |
63 | n &= 3; | |
64 | } | |
65 | ||
66 | while (n > 0) | |
67 | { | |
68 | c = *src++; | |
69 | *++dest = c; | |
70 | if (c == L'\0') | |
71 | return s; | |
72 | n--; | |
73 | } | |
74 | ||
75 | if (c != L'\0') | |
76 | *++dest = L'\0'; | |
77 | ||
78 | return s; | |
79 | } |