1 /* 2 命令的功能 加选项-l -a -i -h 3 */ 4 5 #include <stdio.h> 6 #include <sys/types.h> 7 #include <sys/stat.h> 8 #include <unistd.h> 9 #include <time.h> 10 #include <pwd.h> 11 #include <grp.h> 12 #include <stdlib.h> 13 #include <string.h> 14 #include <dirent.h> 15 #include <getopt.h> 16 17 18 19 static int show_id(const char *argv, struct stat *mystat); 20 static int show_type(const char *argv, struct stat *mystat); 21 static int show_usrerpermission(const char *argv, struct stat *mystat); 22 static int show_grperpermission(const char *argv, struct stat *mystat); 23 static int show_otherpermission(const char *argv, struct stat *mystat); 24 static int numoflink(const char *argv, struct stat *mystat); 25 static char *nameofusr(const char *argv, struct stat *mystat); 26 static char *nameofgrp(const char *argv, struct stat *mystat); 27 static int numofbit(const char *argv, struct stat *mystat); 28 static char *timeoflast_mod(const char *argv, struct stat *mystat); 29 static void name(const char *argv); 30 static int showall(const char *argv, struct stat *mystat); 31 static void show(const int argc, char **argv,struct stat *mystat); 32 static int rd(const char *argv, struct stat *mystat, char (*buf)[50], const int n); 33 static int is_dot(const char *argv); 34 35 int main(int argc, char *argv[]) 36 { 37 if(argc < 3) 38 return 1; 39 struct stat mystat; 40 show(argc, argv, &mystat); 41 42 return 0; 43 } 44 // 显示全部的属性信息 45 static int showall(const char *argv, struct stat *mystat) 46 { 47 int ch; 48 int nlink, bit; 49 char *name_usr = NULL, *name_grp = NULL; 50 char *time = NULL; 51 ch = stat(argv, mystat); 52 if(ch == -1) { 53 perror("stat()"); 54 return -1; 55 } 56 show_type(argv, mystat); 57 58 show_usrerpermission(argv, mystat); 59 60 show_grperpermission(argv, mystat); 61 62 show_otherpermission(argv, mystat); 63 64 nlink = numoflink(argv, mystat); 65 printf(" %3d ", nlink); 66 67 name_usr = nameofusr(argv, mystat); 68 printf("%s ", name_usr); 69 70 name_grp = nameofgrp(argv, mystat); 71 printf("%s ", name_grp); 72 73 bit = numofbit(argv, mystat); 74 printf("%5d ",bit); 75 76 time = timeoflast_mod(argv, mystat); 77 printf("%s ",time); 78 name(argv); 79 80 printf("\n"); 81 return 0; 82 } 83 84 //显示 id 85 static int show_id(const char *argv, struct stat *mystat) 86 { 87 int ch ; 88 89 ch = lstat(argv, mystat); 90 if(ch == -1){ 91 perror("lstat()"); 92 return -1; 93 } 94 return mystat->st_ino; 95 96 } 97 98 //显示文件类型 99 static int show_type(const char *argv, struct stat *mystat) 100 { 101 int ch; 102 ch = lstat(argv, mystat); 103 if(ch == -1){ 104 perror("lstat()"); 105 return -1; 106 } 107 switch( mystat->st_mode & S_IFMT) { 108 case S_IFSOCK : 109 printf("s"); 110 break; 111 112 case S_IFLNK : 113 printf("l"); 114 break; 115 case S_IFREG : 116 printf("-"); 117 break; 118 case S_IFBLK : 119 printf("b"); 120 break; 121 case S_IFDIR : 122 printf("d"); 123 break; 124 case S_IFCHR : 125 printf("c"); 126 break; 127 case S_IFIFO : 128 printf("p"); 129 break; 130 default : 131 break; 132 } 133 return 0; 134 } 135 136 //拥有者权限 137 static int show_usrerpermission(const char *argv, struct stat *mystat) 138 { 139 int ch; 140 ch = lstat(argv, mystat); 141 if(ch == -1){ 142 perror("lstat()"); 143 return -1; 144 } 145 if(mystat->st_mode & S_IRUSR) { 146 printf("r"); 147 } else 148 printf("-"); 149 if(mystat->st_mode & S_IWUSR) { 150 printf("w"); 151 } else 152 printf("-"); 153 if(mystat->st_mode & S_IXUSR) { 154 if(mystat->st_mode & S_ISUID){ 155 printf("s"); 156 } else 157 printf("x"); 158 } else 159 printf("-"); 160 return 0; 161 } 162 163 //所属组权限 164 static int show_grperpermission(const char *argv, struct stat *mystat) 165 { 166 int ch; 167 ch = lstat(argv, mystat); 168 if(ch == -1){ 169 perror("lstat()"); 170 return -1; 171 } 172 if(mystat->st_mode & S_IRGRP) { 173 printf("r"); 174 } else 175 printf("-"); 176 if(mystat->st_mode & S_IWGRP) { 177 printf("w"); 178 } else 179 printf("-"); 180 if(mystat->st_mode & S_IXGRP) { 181 if(mystat->st_mode & S_ISGID){ 182 printf("s"); 183 } else 184 printf("x"); 185 } else 186 printf("-"); 187 return 0; 188 } 189 190 //其他用户权限 191 static int show_otherpermission(const char *argv, struct stat *mystat) 192 { 193 int ch; 194 ch = lstat(argv, mystat); 195 if(ch == -1){ 196 perror("lstat()"); 197 return -1; 198 } 199 if(mystat->st_mode & S_IROTH) { 200 printf("r"); 201 } else 202 printf("-"); 203 if(mystat->st_mode & S_IWOTH) { 204 printf("w"); 205 } else 206 printf("-"); 207 if(mystat->st_mode & S_IXOTH) { 208 if(mystat->st_mode & S_ISVTX){ 209 printf("t"); 210 } else 211 printf("x"); 212 } else 213 printf("-"); 214 return 0; 215 } 216 217 //硬链接个数 218 static int numoflink(const char *argv, struct stat *mystat) 219 { 220 int ch; 221 int num; 222 ch = lstat(argv, mystat); 223 if(ch == -1) { 224 perror("lstat()"); 225 return -1; 226 } 227 num = mystat->st_nlink; 228 return num; 229 } 230 231 //拥有者名字 232 static char *nameofusr(const char *argv, struct stat *mystat) 233 { 234 int ch; 235 struct passwd *pwd = NULL; 236 ch = lstat(argv, mystat); 237 if(ch == -1) { 238 perror("lstat()"); 239 return NULL; 240 } 241 pwd = getpwuid(mystat->st_uid); 242 return pwd->pw_name; 243 } 244 245 //所属组名字 246 static char *nameofgrp(const char *argv, struct stat *mystat) 247 { 248 int ch; 249 struct group *grp = NULL; 250 ch = lstat(argv, mystat); 251 if(ch == -1) { 252 perror("lstat()"); 253 return NULL; 254 } 255 grp = getgrgid(mystat->st_gid); 256 return grp->gr_name; 257 } 258 259 //文件字节大小 260 static int numofbit(const char *argv, struct stat *mystat) 261 { 262 int ch; 263 ch = lstat(argv, mystat); 264 if(ch == -1) { 265 perror("lstat()"); 266 return -1; 267 } 268 return mystat->st_size; 269 } 270 271 //最后修改时间 --mtim 272 static char *timeoflast_mod(const char *argv, struct stat *mystat) 273 { 274 int ch; 275 char *buf = NULL; 276 buf = malloc(100); 277 struct tm *time = NULL; 278 ch = lstat(argv, mystat); 279 if(ch == -1) { 280 perror("lstat()"); 281 return NULL; 282 } 283 time = localtime(&mystat->st_mtim.tv_sec); 284 strftime(buf, 100, "%m月 %d %H:%M", time); 285 return buf; 286 287 288 } 289 290 //文件名 291 static void name(const char *argv) 292 { 293 printf("%s ", argv); 294 } 295 296 //判断目录是不是. 和.. 297 static int is_dot(const char *argv) 298 { 299 char *p = NULL; 300 p = strrchr(argv, '/'); 301 if(p != NULL) { 302 if(!strcmp(p,"/.") || !strcmp(p, "/..")) { 303 return 1; 304 } 305 } 306 return 0; 307 } 308 309 //读文件 310 static int rd(const char *argv, struct stat *mystat, char (*buf)[50], const int n) 311 { 312 int ch; 313 DIR *dp = NULL; 314 struct dirent *dir = NULL; 315 int i=0; 316 ch = lstat(argv, mystat); 317 if(ch == -1) { 318 perror("lstat()"); 319 return -1; 320 } 321 if( S_ISDIR(mystat->st_mode)) { 322 dp = opendir(argv); 323 if(dp == NULL) { 324 perror("opendir()"); 325 return -1; 326 } 327 while(1) { 328 dir = readdir(dp); 329 if(dir == NULL) 330 break; 331 strcpy(buf[i], argv); 332 strcat(buf[i], "/"); 333 strcat(buf[i], dir->d_name); 334 i++; 335 } 336 } else { 337 strcpy(buf[0],argv); 338 i++; 339 } 340 return i; 341 } 342 343 // -l -i等操作 344 static void show(const int argc, char **argv, struct stat *mystat) 345 { 346 char *optstring = "-ilha"; 347 int c; 348 char buf[1024][50] = {}; 349 int i, maxfile; 350 maxfile =rd(argv[2], mystat, buf, 1024); 351 while(1){ 352 c = getopt(argc, argv, optstring); 353 if(c == -1) 354 break; 355 switch(c) { 356 case 'i': 357 for(i=0;i<maxfile;i++) { 358 if(is_dot(buf[i])) 359 continue; 360 printf("%d ",show_id(buf[i], mystat)); 361 name(buf[i]); 362 printf("\n"); 363 } 364 break; 365 case 'l': 366 for(i=0; i<maxfile; i++) { 367 if(is_dot(buf[i])) 368 continue; 369 showall(buf[i], mystat); 370 } 371 break; 372 case 'a': 373 for(i=0;i<maxfile; i++) { 374 name(buf[i]); 375 printf("\n"); 376 } 377 break; 378 case 'h': 379 for(i=0; i<maxfile; i++) { 380 if(is_dot(buf[i])) 381 continue; 382 name(buf[i]); 383 printf("\n"); 384 } 385 break; 386 case 1 : 387 printf("非选项参数%s\n", argv[optind-1]); 388 break; 389 390 default: 391 break; 392 } 393 394 } 395 396 }
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