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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2009 FUJITSU LIMITED
* Author: Li Zefan <lizf@cn.fujitsu.com>
*/
#define _POSIX_C_SOURCE 200809L
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "config.h"
/* NCHARS = 10 + 26 + 26 = 62 */
#define NCHARS 62
#define MAX_LEN1 62
#define MAX_LEN2 (62 * 62)
#define MAX_LEN3 (62 * 62 * 62)
#define MAX_NAMES (MAX_LEN1 + MAX_LEN2 + MAX_LEN3)
/* valid characters for a directory name */
char chars[] = "0123456789qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM";
/* to store the generated directory name */
char name[10];
int names;
int parent_fd;
void create_dir(void)
{
if (mkdirat(parent_fd, name, S_IRWXU)) {
perror("mkdir");
exit(1);
}
}
/*
* create_1 - create length-1 directory names
* @n: how name names to be created
*/
void create_1(int n)
{
int i;
name[1] = '\0';
for (i = 0; i < NCHARS; i++) {
name[0] = chars[i];
create_dir();
if (--n == 0)
return;
}
}
/*
* create_2 - generate length-2 directory names
* @n: how many names to be created
*/
void create_2(int n)
{
int i, j;
name[2] = '\0';
for (i = 0; i < NCHARS; i++) {
name[0] = chars[i];
for (j = 0; j < NCHARS; j++) {
name[1] = chars[j];
create_dir();
if (--n == 0)
return;
}
}
}
/*
* create_3 - generate length-3 directory names
* @n: how many names to be created
*/
void create_3(int n)
{
int i, j, k;
name[3] = '\0';
for (i = 0; i < NCHARS; i++) {
name[0] = chars[i];
for (j = 0; j < NCHARS; j++) {
name[1] = chars[j];
for (k = 0; k < NCHARS; k++) {
name[2] = chars[k];
create_dir();
if (--n == 0)
return;
}
}
}
}
void usage()
{
fprintf(stderr, "Usage: create_short_dirs nr_dirs parent_dir\n");
}
/*
* Create short-name directoriess
* @argv[1]: director number
* @argv[2]: the parent directory
*/
int main(int argc, char *argv[])
{
if (argc != 3) {
usage();
return 1;
}
names = atoi(argv[1]);
if (names > MAX_NAMES || names <= 0) {
usage();
return 1;
}
parent_fd = open(argv[2], O_RDONLY);
if (parent_fd == -1) {
perror("open parent dir failed");
return 1;
}
create_1(names);
if (names <= MAX_LEN1)
return 0;
names -= MAX_LEN1;
create_2(names);
if (names <= MAX_LEN2)
return 0;
names -= MAX_LEN2;
create_3(names);
return 0;
}
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