]>
Commit | Line | Data |
---|---|---|
33a934a3 UD |
1 | /* Copyright (C) 1996, 1997 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. | |
75cd5204 | 4 | |
33a934a3 UD |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | 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 | |
13 | Library General Public License for more details. | |
75cd5204 | 14 | |
33a934a3 UD |
15 | You should have received a copy of the GNU Library General Public |
16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
75cd5204 RM |
19 | |
20 | #include <wchar.h> | |
21 | ||
22 | ||
23 | /* Copy no more than N wide-characters of SRC to DEST, returning the | |
24 | address of the last character written into DEST. */ | |
25 | wchar_t * | |
26 | __wcpncpy (dest, src, n) | |
27 | wchar_t *dest; | |
28 | const wchar_t *src; | |
29 | size_t n; | |
30 | { | |
31 | wint_t c; | |
32 | wchar_t *const s = dest; | |
33 | ||
34 | --dest; | |
35 | ||
36 | if (n >= 4) | |
37 | { | |
38 | size_t n4 = n >> 2; | |
39 | ||
40 | for (;;) | |
41 | { | |
42 | c = *src++; | |
43 | *++dest = c; | |
44 | if (c == L'\0') | |
45 | break; | |
46 | c = *src++; | |
47 | *++dest = c; | |
48 | if (c == L'\0') | |
49 | break; | |
50 | c = *src++; | |
51 | *++dest = c; | |
52 | if (c == L'\0') | |
53 | break; | |
54 | c = *src++; | |
55 | *++dest = c; | |
56 | if (c == L'\0') | |
57 | break; | |
58 | if (--n4 == 0) | |
59 | goto last_chars; | |
60 | } | |
61 | n = n - (dest - s) - 1; | |
62 | if (n == 0) | |
63 | return dest; | |
64 | goto zero_fill; | |
65 | } | |
66 | ||
67 | last_chars: | |
68 | n &= 3; | |
69 | if (n == 0) | |
70 | return dest; | |
71 | ||
72 | do | |
73 | { | |
74 | c = *src++; | |
75 | *++dest = c; | |
76 | if (--n == 0) | |
77 | return dest; | |
78 | } | |
79 | while (c != L'\0'); | |
80 | ||
81 | zero_fill: | |
82 | do | |
83 | *++dest = L'\0'; | |
84 | while (--n > 0); | |
85 | ||
86 | return dest; | |
87 | } | |
88 | ||
89 | weak_alias (__wcpncpy, wcpncpy) |