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664 B

#include <rangecheck.h>
#include <safemult.h>
/* does an array of "elements" members of size "membersize" starting at
* "arraystart" lie inside buf1[0..len-1]? */
int range_arrayinbuf(const void* buf1,size_t len,
const void* arraystart,size_t elements,size_t membersize) {
size_t alen;
if (sizeof(alen)==8) {
uint64 x;
if (!umult64(elements,membersize,&x)) return 0;
} else {
unsigned long long t=(unsigned long long)elements*membersize;
alen=t; /* this strips the upper 32 bits of t */
if (alen!=t) return 0; /* if that changes something, we overflowed */
return range_bufinbuf(buf1,len,arraystart,alen);