strcspn.c 1.4 KB

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  1. /* Copyright (C) 1991, 1994, 1996, 1997 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 Library General Public License as
  5. published by the Free Software Foundation; either version 2 of the
  6. 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. Library General Public License for more details.
  11. You should have received a copy of the GNU Library General Public
  12. License along with the GNU C Library; see the file COPYING.LIB. If not,
  13. write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  14. Boston, MA 02111-1307, USA. */
  15. #if HAVE_CONFIG_H
  16. # include <config.h>
  17. #endif
  18. #if defined _LIBC || HAVE_STRING_H
  19. # include <string.h>
  20. #else
  21. # include <strings.h>
  22. # ifndef strchr
  23. # define strchr index
  24. # endif
  25. #endif
  26. #undef strcspn
  27. /* Return the length of the maximum initial segment of S
  28. which contains no characters from REJECT. */
  29. size_t
  30. strcspn (s, reject)
  31. const char *s;
  32. const char *reject;
  33. {
  34. size_t count = 0;
  35. while (*s != '\0')
  36. if (strchr (reject, *s++) == NULL)
  37. ++count;
  38. else
  39. return count;
  40. return count;
  41. }