strcmp.c 1.6 KB

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  1. /* Copyright (C) 1991, 1996, 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(strcmp)
  18. /* Compare S1 and S2, returning less than, equal to or
  19. greater than zero if S1 is lexicographically less than,
  20. equal to or greater than S2. */
  21. int strcmp (const char *p1, const char *p2)
  22. {
  23. register const unsigned char *s1 = (const unsigned char *) p1;
  24. register const unsigned char *s2 = (const unsigned char *) p2;
  25. unsigned reg_char c1, c2;
  26. do
  27. {
  28. c1 = (unsigned char) *s1++;
  29. c2 = (unsigned char) *s2++;
  30. if (c1 == '\0')
  31. return c1 - c2;
  32. }
  33. while (c1 == c2);
  34. return c1 - c2;
  35. }
  36. libc_hidden_def(strcmp)
  37. #ifndef __UCLIBC_HAS_LOCALE__
  38. libc_hidden_proto(strcoll)
  39. strong_alias(strcmp,strcoll)
  40. libc_hidden_def(strcoll)
  41. #endif