/*
 * randfiles.c
 *
 * Usage: randfiles <basename> <count> <echo?>
 *
 * For benchmarking create performance - create <count> files with
 * numbered names, in random order.  The <echo?> flag, if y, echoes
 * filenames created.  For example, 'randfiles foo 10 y' will create
 * 10 empty files with names ranging from foo0 to foo9.
 *
 * copyleft: Daniel Phillips, Oct 6, 2001, phillips@nl.linux.org
 *
 */

#include <stdlib.h>

#define swap(x, y) do { typeof(x) z = x; x = y; y = z; } while (0)

int main (int argc, char *argv[])
{
	int n = (argc > 2)? strtol(argv[2], 0, 10): 0;
	int i, size = 50, show = argc > 3 && !strncmp(argv[3], "y", 1);
	char name[size];
	int choose[n];
	for (i = 0; i < n; i++) choose[i] = i;
	
	for (i = n; i; i--)
	{
		int j = rand() % i;
		swap(choose[i-1], choose[j]);
	}
	
	for (i = 0; i < n; i++)
	{
		snprintf(name, size, "%s%i", argv[1], choose[i]);
		if (show) printf("create %s\n", name);
		close(open(name, 0100));
	}
	return 0;
}