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1 | /* Copyright (C) 1995, 1996, 1997, 2005 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. | |
3 | Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
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. | |
9 | ||
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 | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
19 | ||
20 | #include <wchar.h> | |
21 | ||
22 | ||
23 | /* Append no more than N wide-character of SRC onto DEST. */ | |
24 | wchar_t * | |
25 | __wcsncat_chk (wchar_t *dest, const wchar_t *src, size_t n, size_t destlen) | |
26 | { | |
27 | wchar_t c; | |
28 | wchar_t * const s = dest; | |
29 | ||
30 | /* Find the end of DEST. */ | |
31 | do | |
32 | { | |
33 | if (__builtin_expect (destlen-- == 0, 0)) | |
34 | __chk_fail (); | |
35 | c = *dest++; | |
36 | } | |
37 | while (c != L'\0'); | |
38 | ||
39 | /* Make DEST point before next character, so we can increment | |
40 | it while memory is read (wins on pipelined cpus). */ | |
41 | ++destlen; | |
42 | dest -= 2; | |
43 | ||
44 | if (n >= 4) | |
45 | { | |
46 | size_t n4 = n >> 2; | |
47 | do | |
48 | { | |
49 | if (__builtin_expect (destlen-- == 0, 0)) | |
50 | __chk_fail (); | |
51 | c = *src++; | |
52 | *++dest = c; | |
53 | if (c == L'\0') | |
54 | return s; | |
55 | if (__builtin_expect (destlen-- == 0, 0)) | |
56 | __chk_fail (); | |
57 | c = *src++; | |
58 | *++dest = c; | |
59 | if (c == L'\0') | |
60 | return s; | |
61 | if (__builtin_expect (destlen-- == 0, 0)) | |
62 | __chk_fail (); | |
63 | c = *src++; | |
64 | *++dest = c; | |
65 | if (c == L'\0') | |
66 | return s; | |
67 | if (__builtin_expect (destlen-- == 0, 0)) | |
68 | __chk_fail (); | |
69 | c = *src++; | |
70 | *++dest = c; | |
71 | if (c == L'\0') | |
72 | return s; | |
73 | } while (--n4 > 0); | |
74 | n &= 3; | |
75 | } | |
76 | ||
77 | while (n > 0) | |
78 | { | |
79 | if (__builtin_expect (destlen-- == 0, 0)) | |
80 | __chk_fail (); | |
81 | c = *src++; | |
82 | *++dest = c; | |
83 | if (c == L'\0') | |
84 | return s; | |
85 | n--; | |
86 | } | |
87 | ||
88 | if (c != L'\0') | |
89 | { | |
90 | if (__builtin_expect (destlen-- == 0, 0)) | |
91 | __chk_fail (); | |
92 | *++dest = L'\0'; | |
93 | } | |
94 | ||
95 | return s; | |
96 | } |