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d4697bc9 | 1 | /* Copyright (C) 1996-2014 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. | |
75cd5204 | 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. | |
75cd5204 | 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. |
75cd5204 | 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/>. */ | |
75cd5204 RM |
18 | |
19 | #include <wchar.h> | |
20 | ||
21 | ||
22 | /* Copy no more than N wide-characters of SRC to DEST, returning the | |
23 | address of the last character written into DEST. */ | |
24 | wchar_t * | |
25 | __wcpncpy (dest, src, n) | |
26 | wchar_t *dest; | |
27 | const wchar_t *src; | |
28 | size_t n; | |
29 | { | |
30 | wint_t c; | |
31 | wchar_t *const s = dest; | |
32 | ||
75cd5204 RM |
33 | if (n >= 4) |
34 | { | |
35 | size_t n4 = n >> 2; | |
36 | ||
37 | for (;;) | |
38 | { | |
39 | c = *src++; | |
bc55a0b8 | 40 | *dest++ = c; |
75cd5204 RM |
41 | if (c == L'\0') |
42 | break; | |
43 | c = *src++; | |
bc55a0b8 | 44 | *dest++ = c; |
75cd5204 RM |
45 | if (c == L'\0') |
46 | break; | |
47 | c = *src++; | |
bc55a0b8 | 48 | *dest++ = c; |
75cd5204 RM |
49 | if (c == L'\0') |
50 | break; | |
51 | c = *src++; | |
bc55a0b8 | 52 | *dest++ = c; |
75cd5204 RM |
53 | if (c == L'\0') |
54 | break; | |
55 | if (--n4 == 0) | |
56 | goto last_chars; | |
57 | } | |
80b54217 | 58 | n -= dest - s; |
75cd5204 RM |
59 | goto zero_fill; |
60 | } | |
61 | ||
62 | last_chars: | |
63 | n &= 3; | |
64 | if (n == 0) | |
65 | return dest; | |
66 | ||
80b54217 | 67 | for (;;) |
75cd5204 RM |
68 | { |
69 | c = *src++; | |
80b54217 UD |
70 | --n; |
71 | *dest++ = c; | |
72 | if (c == L'\0') | |
73 | break; | |
74 | if (n == 0) | |
75cd5204 RM |
75 | return dest; |
76 | } | |
75cd5204 RM |
77 | |
78 | zero_fill: | |
80b54217 UD |
79 | while (n-- > 0) |
80 | dest[n] = L'\0'; | |
75cd5204 | 81 | |
80b54217 | 82 | return dest - 1; |
75cd5204 RM |
83 | } |
84 | ||
85 | weak_alias (__wcpncpy, wcpncpy) |