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- /* Copyright (C) 1991, 1997 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
- #include <string.h>
- #include "memcopy.h"
- /* Experimentally off - libc_hidden_proto(strncat) */
- char *strncat (char *s1, const char *s2, size_t n)
- {
- reg_char c;
- char *s = s1;
- /* Find the end of S1. */
- do
- c = *s1++;
- while (c != '\0');
- /* Make S1 point before next character, so we can increment
- it while memory is read (wins on pipelined cpus). */
- s1 -= 2;
- if (n >= 4)
- {
- size_t n4 = n >> 2;
- do
- {
- c = *s2++;
- *++s1 = c;
- if (c == '\0')
- return s;
- c = *s2++;
- *++s1 = c;
- if (c == '\0')
- return s;
- c = *s2++;
- *++s1 = c;
- if (c == '\0')
- return s;
- c = *s2++;
- *++s1 = c;
- if (c == '\0')
- return s;
- } while (--n4 > 0);
- n &= 3;
- }
- while (n > 0)
- {
- c = *s2++;
- *++s1 = c;
- if (c == '\0')
- return s;
- n--;
- }
- if (c != '\0')
- *++s1 = '\0';
- return s;
- }
- libc_hidden_def(strncat)
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