strspn.c 1.3 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. /* Return the length of the maximum initial segment
  17. of S which contains only characters in ACCEPT. */
  18. size_t strspn (const char *s, const char *accept)
  19. {
  20. const char *p;
  21. const char *a;
  22. size_t count = 0;
  23. for (p = s; *p != '\0'; ++p)
  24. {
  25. for (a = accept; *a != '\0'; ++a)
  26. if (*p == *a)
  27. break;
  28. if (*a == '\0')
  29. return count;
  30. else
  31. ++count;
  32. }
  33. return count;
  34. }
  35. libc_hidden_def(strspn)