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1 | /* Copyright (C) 1991, 1997, 2000, 2003, 2004 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. | |
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 | |
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. */ | |
18 | ||
19 | #include <stddef.h> | |
20 | #include <string.h> | |
21 | #include <memcopy.h> | |
22 | ||
23 | #undef strcpy | |
24 | ||
25 | /* Copy SRC to DEST with checking of destination buffer overflow. */ | |
26 | char * | |
27 | __strcpy_chk (dest, src, destlen) | |
28 | char *dest; | |
29 | const char *src; | |
30 | size_t destlen; | |
31 | { | |
32 | reg_char c; | |
33 | char *s = (char *) src; | |
708c687a UD |
34 | const ptrdiff_t off = dest - s; |
35 | ||
36 | while (__builtin_expect (destlen >= 4, 0)) | |
37 | { | |
38 | c = s[0]; | |
39 | s[off] = c; | |
40 | if (c == '\0') | |
41 | return dest; | |
42 | c = s[1]; | |
43 | s[off + 1] = c; | |
44 | if (c == '\0') | |
45 | return dest; | |
46 | c = s[2]; | |
47 | s[off + 2] = c; | |
48 | if (c == '\0') | |
49 | return dest; | |
50 | c = s[3]; | |
51 | s[off + 3] = c; | |
52 | if (c == '\0') | |
53 | return dest; | |
54 | destlen -= 4; | |
55 | s += 4; | |
56 | } | |
b5cc329c UD |
57 | |
58 | do | |
59 | { | |
60 | if (__builtin_expect (destlen-- == 0, 0)) | |
708c687a UD |
61 | __chk_fail (); |
62 | c = *s; | |
63 | *(s++ + off) = c; | |
b5cc329c UD |
64 | } |
65 | while (c != '\0'); | |
66 | ||
67 | return dest; | |
68 | } |