strcat.c 1.4 KB

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  1. /* Copyright (C) 1991, 1997, 2003 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. The GNU C Library is free software; you can redistribute it and/or
  4. modify it under the terms of the GNU Lesser General Public
  5. License as published by the Free Software Foundation; either
  6. version 2.1 of the License, or (at your option) any later version.
  7. The GNU C Library is distributed in the hope that it will be useful,
  8. but WITHOUT ANY WARRANTY; without even the implied warranty of
  9. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  10. Lesser General Public License for more details.
  11. You should have received a copy of the GNU Lesser General Public
  12. License along with the GNU C Library; if not, write to the Free
  13. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  14. 02111-1307 USA. */
  15. #include <string.h>
  16. #include "memcopy.h"
  17. libc_hidden_proto(strcat)
  18. /* Append SRC on the end of DEST. */
  19. char *strcat (char *dest, const char *src)
  20. {
  21. char *s1 = dest;
  22. const char *s2 = src;
  23. reg_char c;
  24. /* Find the end of the string. */
  25. do
  26. c = *s1++;
  27. while (c != '\0');
  28. /* Make S1 point before the next character, so we can increment
  29. it while memory is read (wins on pipelined cpus). */
  30. s1 -= 2;
  31. do
  32. {
  33. c = *s2++;
  34. *++s1 = c;
  35. }
  36. while (c != '\0');
  37. return dest;
  38. }
  39. libc_hidden_def(strcat)