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b168057a | 1 | /* Copyright (C) 1995-2015 Free Software Foundation, Inc. |
8215c9ec UD |
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 | |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
8215c9ec UD |
18 | |
19 | #include <wchar.h> | |
20 | ||
21 | ||
22 | /* Append no more than N wide-character of SRC onto DEST. */ | |
23 | wchar_t * | |
24 | __wcsncat_chk (wchar_t *dest, const wchar_t *src, size_t n, size_t destlen) | |
25 | { | |
26 | wchar_t c; | |
27 | wchar_t * const s = dest; | |
28 | ||
29 | /* Find the end of DEST. */ | |
30 | do | |
31 | { | |
a1ffb40e | 32 | if (__glibc_unlikely (destlen-- == 0)) |
8215c9ec UD |
33 | __chk_fail (); |
34 | c = *dest++; | |
35 | } | |
36 | while (c != L'\0'); | |
37 | ||
38 | /* Make DEST point before next character, so we can increment | |
39 | it while memory is read (wins on pipelined cpus). */ | |
40 | ++destlen; | |
41 | dest -= 2; | |
42 | ||
43 | if (n >= 4) | |
44 | { | |
45 | size_t n4 = n >> 2; | |
46 | do | |
47 | { | |
a1ffb40e | 48 | if (__glibc_unlikely (destlen-- == 0)) |
8215c9ec UD |
49 | __chk_fail (); |
50 | c = *src++; | |
51 | *++dest = c; | |
52 | if (c == L'\0') | |
53 | return s; | |
a1ffb40e | 54 | if (__glibc_unlikely (destlen-- == 0)) |
8215c9ec UD |
55 | __chk_fail (); |
56 | c = *src++; | |
57 | *++dest = c; | |
58 | if (c == L'\0') | |
59 | return s; | |
a1ffb40e | 60 | if (__glibc_unlikely (destlen-- == 0)) |
8215c9ec UD |
61 | __chk_fail (); |
62 | c = *src++; | |
63 | *++dest = c; | |
64 | if (c == L'\0') | |
65 | return s; | |
a1ffb40e | 66 | if (__glibc_unlikely (destlen-- == 0)) |
8215c9ec UD |
67 | __chk_fail (); |
68 | c = *src++; | |
69 | *++dest = c; | |
70 | if (c == L'\0') | |
71 | return s; | |
72 | } while (--n4 > 0); | |
73 | n &= 3; | |
74 | } | |
75 | ||
76 | while (n > 0) | |
77 | { | |
a1ffb40e | 78 | if (__glibc_unlikely (destlen-- == 0)) |
8215c9ec UD |
79 | __chk_fail (); |
80 | c = *src++; | |
81 | *++dest = c; | |
82 | if (c == L'\0') | |
83 | return s; | |
84 | n--; | |
85 | } | |
86 | ||
87 | if (c != L'\0') | |
88 | { | |
a1ffb40e | 89 | if (__glibc_unlikely (destlen-- == 0)) |
8215c9ec UD |
90 | __chk_fail (); |
91 | *++dest = L'\0'; | |
92 | } | |
93 | ||
94 | return s; | |
95 | } |