projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 85dd1003 | 1 | /* Copyright (C) 1991, 1997, 2003 Free Software Foundation, Inc. |
| c84142e8 | 2 | This file is part of the GNU C Library. |
| 28f540f4 | 3 | |
| c84142e8 | 4 | The GNU C Library is free software; you can redistribute it and/or |
| 41bdb6e2 AJ |
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. | |
| 28f540f4 | 8 | |
| c84142e8 UD |
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 | |
| 41bdb6e2 | 12 | Lesser General Public License for more details. |
| 28f540f4 | 13 | |
| 41bdb6e2 AJ |
14 | You should have received a copy of the GNU Lesser General Public |
| 15 | License along with the GNU C Library; if not, write to the Free | |
| 16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
| 17 | 02111-1307 USA. */ | |
| 28f540f4 | 18 | |
| 28f540f4 RM |
19 | #include <string.h> |
| 20 | #include <memcopy.h> | |
| 21 | ||
| 9a0a462c | 22 | #undef strncpy |
| c84142e8 | 23 | |
| 28f540f4 | 24 | char * |
| c84142e8 UD |
25 | strncpy (s1, s2, n) |
| 26 | char *s1; | |
| 27 | const char *s2; | |
| 28 | size_t n; | |
| 28f540f4 RM |
29 | { |
| 30 | reg_char c; | |
| 31 | char *s = s1; | |
| 32 | ||
| 33 | --s1; | |
| 34 | ||
| 35 | if (n >= 4) | |
| 36 | { | |
| 37 | size_t n4 = n >> 2; | |
| 38 | ||
| 39 | for (;;) | |
| 40 | { | |
| 41 | c = *s2++; | |
| 42 | *++s1 = c; | |
| 43 | if (c == '\0') | |
| 44 | break; | |
| 45 | c = *s2++; | |
| 46 | *++s1 = c; | |
| 47 | if (c == '\0') | |
| 48 | break; | |
| 49 | c = *s2++; | |
| 50 | *++s1 = c; | |
| 51 | if (c == '\0') | |
| 52 | break; | |
| 53 | c = *s2++; | |
| 54 | *++s1 = c; | |
| 55 | if (c == '\0') | |
| 56 | break; | |
| 57 | if (--n4 == 0) | |
| 58 | goto last_chars; | |
| 59 | } | |
| 60 | n = n - (s1 - s) - 1; | |
| 61 | if (n == 0) | |
| 62 | return s; | |
| 63 | goto zero_fill; | |
| 64 | } | |
| 65 | ||
| 66 | last_chars: | |
| 67 | n &= 3; | |
| 68 | if (n == 0) | |
| 69 | return s; | |
| 70 | ||
| 71 | do | |
| 72 | { | |
| 73 | c = *s2++; | |
| 74 | *++s1 = c; | |
| 75 | if (--n == 0) | |
| 76 | return s; | |
| 77 | } | |
| 78 | while (c != '\0'); | |
| 79 | ||
| 80 | zero_fill: | |
| 81 | do | |
| 82 | *++s1 = '\0'; | |
| 83 | while (--n > 0); | |
| 84 | ||
| 85 | return s; | |
| 86 | } | |
| 85dd1003 | 87 | libc_hidden_builtin_def (strncpy) |