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  }