1 /******************************************************************************/ 2 /* */ 3 /* Copyright (c) 2009 FUJITSU LIMITED */ 4 /* */ 5 /* This program is free software; you can redistribute it and/or modify */ 6 /* it under the terms of the GNU General Public License as published by */ 7 /* the Free Software Foundation; either version 2 of the License, or */ 8 /* (at your option) any later version. */ 9 /* */ 10 /* This program is distributed in the hope that it will be useful, */ 11 /* but WITHOUT ANY WARRANTY; without even the implied warranty of */ 12 /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See */ 13 /* the GNU General Public License for more details. */ 14 /* */ 15 /* You should have received a copy of the GNU General Public License */ 16 /* along with this program; if not, write to the Free Software */ 17 /* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ 18 /* */ 19 /* Author: Li Zefan <lizf (at) cn.fujitsu.com> */ 20 /* */ 21 /******************************************************************************/ 22 23 #define _ATFILE_SOURCE 24 #include <unistd.h> 25 #include <stdlib.h> 26 #include <stdio.h> 27 #include <errno.h> 28 #include <fcntl.h> 29 #include <sys/stat.h> 30 #include <sys/types.h> 31 #include "config.h" 32 33 /* valid characters for a directory name */ 34 char chars[] = "0123456789qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM"; 35 36 /* to store the generated directory name */ 37 char name[10]; 38 int names; 39 int parent_fd; 40 41 /* NCHARS = 10 + 26 + 26 = 62 */ 42 #define NCHARS 62 43 #define MAX_LEN1 62 44 #define MAX_LEN2 (62 * 62) 45 #define MAX_LEN3 (62 * 62 * 62) 46 #define MAX_NAMES (MAX_LEN1 + MAX_LEN2 + MAX_LEN3) 47 48 void create_dir(void) 49 { 50 #ifdef HAVE_MKDIRAT 51 if (mkdirat(parent_fd, name, S_IRWXU)) { 52 perror("mkdir"); 53 exit(1); 54 } 55 #else 56 fprintf(stderr, "System lacks mkdirat() call.\n"); 57 exit(1); 58 #endif 59 } 60 61 /* 62 * create_1 - create length-1 directory names 63 * @n: how name names to be created 64 */ 65 void create_1(int n) 66 { 67 int i; 68 69 name[1] = '\0'; 70 for (i = 0; i < NCHARS; i++) { 71 name[0] = chars[i]; 72 create_dir(); 73 if (--n == 0) 74 return; 75 } 76 } 77 78 /* 79 * create_2 - generate length-2 directory names 80 * @n: how many names to be created 81 */ 82 void create_2(int n) 83 { 84 int i, j; 85 86 name[2] = '\0'; 87 for (i = 0; i < NCHARS; i++) { 88 name[0] = chars[i]; 89 for (j = 0; j < NCHARS; j++) { 90 name[1] = chars[j]; 91 create_dir(); 92 if (--n == 0) 93 return; 94 } 95 } 96 } 97 98 /* 99 * create_3 - generate length-3 directory names 100 * @n: how many names to be created 101 */ 102 void create_3(int n) 103 { 104 int i, j, k; 105 106 name[3] = '\0'; 107 for (i = 0; i < NCHARS; i++) { 108 name[0] = chars[i]; 109 for (j = 0; j < NCHARS; j++) { 110 name[1] = chars[j]; 111 for (k = 0; k < NCHARS; k++) { 112 name[2] = chars[k]; 113 create_dir(); 114 if (--n == 0) 115 return; 116 } 117 } 118 } 119 } 120 121 void usage() 122 { 123 fprintf(stderr, "Usage: create_short_dirs nr_dirs parent_dir\n"); 124 } 125 126 /* 127 * Create short-name directoriess 128 * @argv[1]: director number 129 * @argv[2]: the parent directory 130 */ 131 int main(int argc, char *argv[]) 132 { 133 if (argc != 3) { 134 usage(); 135 return 1; 136 } 137 138 names = atoi(argv[1]); 139 if (names > MAX_NAMES || names <= 0) { 140 usage(); 141 return 1; 142 } 143 144 parent_fd = open(argv[2], O_RDONLY); 145 if (parent_fd == -1) { 146 perror("open parent dir"); 147 return 1; 148 } 149 150 create_1(names); 151 if (names <= MAX_LEN1) 152 return 0; 153 154 names -= MAX_LEN1; 155 create_2(names); 156 if (names <= MAX_LEN2) 157 return 0; 158 159 names -= MAX_LEN2; 160 create_3(names); 161 162 return 0; 163 } 164
