#include <errno.h>
#include <inttypes.h>
#include <stddef.h>
#include <stdint.h>

int
cli_parse_int64(const char *s, int64_t *out)
{
	char *end;

	if (NULL == s || '\0' == *s)
		return 1;

	errno = 0;
	const intmax_t v = strtoimax(s, &end, 10);

	if (s == end || ERANGE == errno || '\0' != *end || v < INT64_MIN || v > INT64_MAX)
		return 1;

	*out = (int64_t)v;
	return 0;
}