Don't pad code segments out to 64k any more
[glibc/nacl-glibc.git] / debug / stpncpy_chk.c
blobd136339dea748a0f5a310257b56aa8b04359586d
1 /* Copyright (C) 1993,1995,1996,1997,2002,2005 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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. */
19 /* This is almost copied from strncpy.c, written by Torbjorn Granlund. */
21 #include <string.h>
24 /* Copy no more than N characters of SRC to DEST, returning the address of
25 the terminating '\0' in DEST, if any, or else DEST + N. */
26 char *
27 __stpncpy_chk (char *dest, const char *src, size_t n, size_t destlen)
29 char c;
30 char *s = dest;
32 if (__builtin_expect (destlen < n, 0))
33 __chk_fail ();
35 if (n >= 4)
37 size_t n4 = n >> 2;
39 for (;;)
41 c = *src++;
42 *dest++ = c;
43 if (c == '\0')
44 break;
45 c = *src++;
46 *dest++ = c;
47 if (c == '\0')
48 break;
49 c = *src++;
50 *dest++ = c;
51 if (c == '\0')
52 break;
53 c = *src++;
54 *dest++ = c;
55 if (c == '\0')
56 break;
57 if (--n4 == 0)
58 goto last_chars;
60 n -= dest - s;
61 goto zero_fill;
64 last_chars:
65 n &= 3;
66 if (n == 0)
67 return dest;
69 for (;;)
71 c = *src++;
72 --n;
73 *dest++ = c;
74 if (c == '\0')
75 break;
76 if (n == 0)
77 return dest;
80 zero_fill:
81 while (n-- > 0)
82 dest[n] = '\0';
84 return dest - 1;