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/*

@deftypefn Supplemental void* memchr (const void *@var{s}, int @var{c}, @

  size_t @var{n})

This function searches memory starting at @code{*@var{s}} for the

character @var{c}.  The search only ends with the first occurrence of

@var{c}, or after @var{length} characters; in particular, a null

character does not terminate the search.  If the character @var{c} is

found within @var{length} characters of @code{*@var{s}}, a pointer

to the character is returned.  If @var{c} is not found, then @code{NULL} is

returned.

@end deftypefn

*/

#include <ansidecl.h>

#include <stddef.h>

PTR

memchr (register const PTR src_void, int c, size_t length)

{

  const unsigned char *src = (const unsigned char *)src_void;

  while (length-- > 0)

  {

    if (*src == c)

     return (PTR)src;

    src++;

  }

  return NULL;

}