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dff8da6b | 1 | /* Copyright (C) 1995-2024 Free Software Foundation, Inc. |
8215c9ec | 2 | This file is part of the GNU C Library. |
8215c9ec UD |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Lesser General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
8215c9ec UD |
17 | |
18 | #include <wchar.h> | |
19 | ||
20 | ||
21 | /* Append no more than N wide-character of SRC onto DEST. */ | |
22 | wchar_t * | |
23 | __wcsncat_chk (wchar_t *dest, const wchar_t *src, size_t n, size_t destlen) | |
24 | { | |
25 | wchar_t c; | |
26 | wchar_t * const s = dest; | |
27 | ||
28 | /* Find the end of DEST. */ | |
29 | do | |
30 | { | |
a1ffb40e | 31 | if (__glibc_unlikely (destlen-- == 0)) |
8215c9ec UD |
32 | __chk_fail (); |
33 | c = *dest++; | |
34 | } | |
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 | ++destlen; | |
40 | dest -= 2; | |
41 | ||
42 | if (n >= 4) | |
43 | { | |
44 | size_t n4 = n >> 2; | |
45 | do | |
46 | { | |
a1ffb40e | 47 | if (__glibc_unlikely (destlen-- == 0)) |
8215c9ec UD |
48 | __chk_fail (); |
49 | c = *src++; | |
50 | *++dest = c; | |
51 | if (c == L'\0') | |
52 | return s; | |
a1ffb40e | 53 | if (__glibc_unlikely (destlen-- == 0)) |
8215c9ec UD |
54 | __chk_fail (); |
55 | c = *src++; | |
56 | *++dest = c; | |
57 | if (c == L'\0') | |
58 | return s; | |
a1ffb40e | 59 | if (__glibc_unlikely (destlen-- == 0)) |
8215c9ec UD |
60 | __chk_fail (); |
61 | c = *src++; | |
62 | *++dest = c; | |
63 | if (c == L'\0') | |
64 | return s; | |
a1ffb40e | 65 | if (__glibc_unlikely (destlen-- == 0)) |
8215c9ec UD |
66 | __chk_fail (); |
67 | c = *src++; | |
68 | *++dest = c; | |
69 | if (c == L'\0') | |
70 | return s; | |
71 | } while (--n4 > 0); | |
72 | n &= 3; | |
73 | } | |
74 | ||
75 | while (n > 0) | |
76 | { | |
a1ffb40e | 77 | if (__glibc_unlikely (destlen-- == 0)) |
8215c9ec UD |
78 | __chk_fail (); |
79 | c = *src++; | |
80 | *++dest = c; | |
81 | if (c == L'\0') | |
82 | return s; | |
83 | n--; | |
84 | } | |
85 | ||
86 | if (c != L'\0') | |
87 | { | |
a1ffb40e | 88 | if (__glibc_unlikely (destlen-- == 0)) |
8215c9ec UD |
89 | __chk_fail (); |
90 | *++dest = L'\0'; | |
91 | } | |
92 | ||
93 | return s; | |
94 | } |