libiberty/memchr.c

   1 /*
   2
   3 @deftypefn Supplemental void* memchr (const void *@var{s}, int @var{c}, @
   4   size_t @var{n})
   5
   6 This function searches memory starting at @code{*@var{s}} for the
   7 character @var{c}.  The search only ends with the first occurrence of
   8 @var{c}, or after @var{length} characters; in particular, a null
   9 character does not terminate the search.  If the character @var{c} is
  10 found within @var{length} characters of @code{*@var{s}}, a pointer
  11 to the character is returned.  If @var{c} is not found, then @code{NULL} is
  12 returned.
  13
  14 @end deftypefn
  15
  16 */
  17
  18 #include <ansidecl.h>
  19 #include <stddef.h>
  20
  21 PTR
  22 memchr (register const PTR src_void, int c, size_t length)
  23 {
  24   const unsigned char *src = (const unsigned char *)src_void;
  25
  26   while (length-- > 0)
  27   {
  28     if (*src == c)
  29      return (PTR)src;
  30     src++;
  31   }
  32   return NULL;
  33 }