#include <stdlib.h>
#include <errno.h>
#include <stdio.h>

int main(int argc, char *argv[])
{
	unsigned long sz;
	void *ptr;
	char *endptr;

	if (argc != 2) {
		fprintf(stderr, "usage: %s bytes\n", argv[0]);
		return 1;
	}
	errno = 0;
	sz = strtoul(argv[1], &endptr, 10);
	if (errno || (argv[1] == endptr)) {
		fprintf(stderr, "invalid value\n");
		return 1;
	}
	fprintf(stderr, "trying %lu bytes... ", sz);
	ptr = malloc(sz);
	fprintf(stderr, "got %p\n", ptr);
	return 0;
}