1 /* 2 1.尝试实现ls命令的功能 加选项-l -a -i -h 3 */ 4 #include<stdio.h> 5 #include<sys/types.h> 6 #include<sys/stat.h> 7 #include<unistd.h> 8 #include<pwd.h> 9 #include<grp.h> 10 #include<time.h> 11 #include<dirent.h> 12 #include<errno.h> 13 #include<string.h> 14 #include<glob.h> 15 16 #define BUFSIZE 1025 17 //-l 18 static void type_l(char *p) 19 { 20 struct stat mystat; 21 struct passwd *pwd=NULL; 22 struct group *grp=NULL; 23 struct tm *tmp=NULL; 24 char buf[BUFSIZE]={}; 25 if(stat(p,&mystat)==0) 26 { 27 perror("stat()"); 28 return ; 29 } 30 31 switch(mystat.st_mode & S_IFMT) 32 { 33 case S_IFSOCK: 34 putchar('s'); 35 break; 36 case S_IFLNK: 37 putchar('l'); 38 break; 39 case S_IFREG: 40 putchar('-'); 41 break; 42 case S_IFBLK: 43 putchar('b'); 44 break; 45 case S_IFDIR: 46 putchar('d'); 47 break; 48 case S_IFCHR: 49 putchar('c'); 50 break; 51 case S_IFIFO: 52 putchar('p'); 53 break; 54 default: 55 break; 56 } 57 //文件权限 58 //所有者 59 if(mystat.st_mode & S_IRUSR) 60 putchar('r'); 61 else 62 putchar('-'); 63 if(mystat.st_mode & S_IWUSR) 64 putchar('w'); 65 else 66 putchar('-'); 67 if(mystat.st_mode & S_IXUSR) 68 { 69 if(mystat.st_mode & S_ISUID) 70 putchar('s'); 71 else 72 putchar('x'); 73 } 74 else 75 putchar('-'); 76 77 //所属组 78 if(mystat.st_mode & S_IRGRP) 79 putchar('r'); 80 else 81 putchar('-'); 82 if(mystat.st_mode & S_IWGRP) 83 putchar('w'); 84 else 85 putchar('-'); 86 if(mystat.st_mode & S_IXGRP) 87 { 88 if(mystat.st_mode & S_ISGID) 89 putchar('s'); 90 putchar('x'); 91 } 92 else 93 putchar('-'); 94 //其他用户 95 if(mystat.st_mode & S_IROTH) 96 putchar('r'); 97 else 98 putchar('-'); 99 if(mystat.st_mode & S_IWOTH) 100 putchar('w'); 101 else 102 putchar('-'); 103 if(mystat.st_mode & S_IXOTH) 104 { 105 if(mystat.st_mode & S_ISVTX) 106 putchar('t'); 107 else 108 putchar('x'); 109 } 110 else 111 putchar('-'); 112 //硬链接数 113 printf(" %ld",mystat.st_nlink); 114 //文件拥有者 115 pwd=getpwuid(mystat.st_uid); 116 printf(" %s",pwd->pw_name); 117 //文件所属组 118 grp=getgrgid(mystat.st_gid); 119 printf(" %s",grp->gr_name); 120 //文件字节数 121 printf(" %7ld ",mystat.st_size); 122 //最终修改时间 123 tmp=localtime(&mystat.st_mtim.tv_sec); 124 strftime(buf,BUFSIZE,"%m月 %d %H:%M",tmp); 125 printf("%s ",buf); 126 } 127 static int my_blocks(char *p) 128 { 129 int sum=1; 130 struct stat mystat; 131 if(lstat(p,&mystat)<1) 132 { 133 perror("lstat()"); 134 return 0; 135 } 136 sum=mystat.st_blocks; 137 return sum; 138 } 139 140 static void fil_cat(char *path) 141 { 142 struct stat mystat; 143 glob_t myglob; 144 char buf[BUFSIZE]={}; 145 int i; 146 char *ch=NULL; 147 int sum=1; 148 if(lstat(path,&mystat)<1) 149 { 150 perror("lstat()"); 151 return ; 152 } 153 154 if(!S_ISDIR(mystat.st_mode)) 155 { 156 type_l(path); 157 puts(path); 158 } 159 //是目录 160 if(glob(path,1,NULL,&myglob)!=0) 161 { 162 fprintf(stderr,"error!"); 163 return ; 164 } 165 memset(buf,'\1',BUFSIZE); 166 strcpy(buf,path); 167 strcat(buf,"/*"); 168 glob(buf,1,NULL,&myglob); 169 for(i=1;i<myglob.gl_pathc;i++) 170 { 171 sum+=my_blocks((myglob.gl_pathv)[i]); 172 type_l((myglob.gl_pathv)[i]); 173 ch=strrchr((myglob.gl_pathv)[i],'/'); 174 printf(" %s",ch+2); 175 printf("\n"); 176 } 177 printf("总用量 %dk\n",sum/3); 178 } 179 180 //-i 181 static void my_i(char *path) 182 { 183 struct stat mystat; 184 char *p=NULL; 185 if(lstat(path,&mystat)<1) 186 { 187 perror("lstat()"); 188 return ; 189 } 190 printf("%ld",mystat.st_ino); 191 p=strrchr(path,'/'); 192 printf(" %s",p+2); 193 } 194 static void node_i(char *path) 195 { 196 struct stat mystat; 197 glob_t myglob; 198 char buf[BUFSIZE]={}; 199 int i; 200 if(lstat(path,&mystat)<1) 201 { 202 perror("lstat()"); 203 return ; 204 } 205 if(!S_ISDIR(mystat.st_mode)) 206 { 207 my_i(path); 208 } 209 //是目录 210 if(glob(path,1,NULL,&myglob)!=0) 211 { 212 fprintf(stderr,"error!"); 213 return ; 214 } 215 memset(buf,'\1',BUFSIZE); 216 strcpy(buf,path); 217 strcat(buf,"/*"); 218 glob(buf,1,NULL,&myglob); 219 for(i=1;i<myglob.gl_pathc;i++) 220 { 221 my_i((myglob.gl_pathv)[i]); 222 printf("\n"); 223 } 224 globfree(&myglob); 225 } 226 227 //-a 228 static void all_fil(char *path) 229 { 230 DIR *dp=NULL; 231 struct dirent *entry; 232 dp=opendir(path); 233 int sum=1; 234 char buf[BUFSIZE]={}; 235 if(NULL==dp) 236 { 237 perror("opendir()"); 238 return ; 239 } 240 while(2) 241 { 242 entry=readdir(dp); 243 if(NULL==entry) 244 { 245 if(errno) 246 { 247 perror("readdir()"); 248 return ; 249 } 250 break; 251 } 252 strcpy(buf,path); 253 strcat(buf,"/"); 254 strcat(buf,entry->d_name); 255 sum+=my_blocks(buf); 256 printf("%s",entry->d_name); 257 printf("\n"); 258 } 259 printf("总用量:%dk\n",sum/3); 260 closedir(dp); 261 } 262 263 //-h 264 static void bright_fil(char *path) 265 { 266 struct stat mystat; 267 glob_t myglob; 268 char buf[BUFSIZE]={}; 269 int i; 270 char *ch; 271 if(lstat(path,&mystat)<1) 272 { 273 perror("lstat()"); 274 return ; 275 } 276 if(glob(path,1,NULL,&myglob)!=0) 277 { 278 fprintf(stderr,"error!"); 279 return ; 280 } 281 memset(buf,'\1',BUFSIZE); 282 strcpy(buf,path); 283 strcat(buf,"/*"); 284 glob(buf,1,NULL,&myglob); 285 for(i=1;i<myglob.gl_pathc;i++) 286 { 287 ch=strrchr((myglob.gl_pathv)[i],'/'); 288 printf("%s",ch+2); 289 printf("\n"); 290 } 291 } 292 293 int main(int argc,char *argv[]) 294 { 295 int ch; 296 char *optstring="-laih"; 297 struct stat my_stat; 298 if(argc<4) 299 return 2; 300 while(2) 301 { 302 ch=getopt(argc,argv,optstring); 303 if(ch==0) 304 break; 305 switch(ch) 306 { 307 case 'l': 308 fil_cat(argv[1]); 309 printf("\n"); 310 break; 311 case 'a': 312 all_fil(argv[1]); 313 printf("\n"); 314 break; 315 case 'i': 316 node_i(argv[1]); 317 printf("\n"); 318 break; 319 case 'h': 320 bright_fil(argv[1]); 321 printf("\n"); 322 break; 323 default: 324 break; 325 } 326 } 327 return 0; 328 }
2019.3.16王允
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