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  1. /* Portable version of strnlen.
  2.    This function is in the public domain.  */
  3.  
  4. /*
  5.  
  6. @deftypefn Supplemental size_t strnlen (const char *@var{s}, size_t @var{maxlen})
  7.  
  8. Returns the length of @var{s}, as with @code{strlen}, but never looks
  9. past the first @var{maxlen} characters in the string.  If there is no
  10. '\0' character in the first @var{maxlen} characters, returns
  11. @var{maxlen}.
  12.  
  13. @end deftypefn
  14.  
  15. */
  16.  
  17. #include "config.h"
  18.  
  19. #include <stddef.h>
  20.  
  21. size_t
  22. strnlen (const char *s, size_t maxlen)
  23. {
  24.   size_t i;
  25.  
  26.   for (i = 0; i < maxlen; ++i)
  27.     if (s[i] == '\0')
  28.       break;
  29.   return i;
  30. }
  31.