1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
|
#include <errno.h>
#if __has_include(<stdckdint.h>)
# include <stdckdint.h>
# ifdef __APPLE__
# warning "stdckdint.h now available on Mac; remove manual ckd_*() code"
# endif
#elifdef __GNUC__
# define ckd_add(r, a, b) ((bool)__builtin_add_overflow(a, b, r))
# define ckd_mul(r, a, b) ((bool)__builtin_mul_overflow(a, b, r))
#else
# define ckd_add(r, a, b) (*(r) = (a) + (b))
# define ckd_mul(r, a, b) (*(r) = (a) * (b))
# warning "ckd_*() not supported on the current platform"
#endif
#include <stdlib.h>
#include "alloc.h"
#include "errors.h"
void *
bufalloc(void *p, size_t n, size_t m)
{
if (ckd_mul(&n, n, m)) {
errno = EOVERFLOW;
err(__func__);
}
if (!(p = realloc(p, n)))
err(__func__);
return p;
}
|
