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

/*

@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>

void *
memchr (register const void *src_void, int c, size_t length)
{
const unsigned char *src = (const unsigned char *)src_void;

while (length-- > 0)
{
if (*src == c)
return (void *)src;
src++;
}
return NULL;
}