高仿linux下的ls -l命令——C语言实现

              1 #include <stdio.h>
  2 #include <stdlib.h>
  3 #include <unistd.h>
  4 #include <sys/stat.h>
  5 #include <sys/types.h>
  6 #include <string.h>
  7 #include <time.h>
  8 #include <pwd.h>
  9 #include <grp.h>
 10 #include <time.h>
 11 #include <dirent.h>
 12 13#define MAX_FILE_NUM 200
 14 15 16//可能还有一些小问题没有解决，功能基本已经实现，如有建议，望大佬赐教 17 18 typedef struct LS
 19{
 20char mode[15];    // 文件的模式 21int dir_num;    // 是否目录或目录中包含目录的数量 22char user[20];    // 文件的用户名 23char group[20];    // 文件的组名 24long size;        // 文件的字节数 25char time[30];    // 文件的最后修改时间 26char year[5];    // 拓展用，年份 27char mon[5];    // 月份 28char hour[5];    // 时 29char min[5];    // 分 30int st_mode;    // 文件类型和权限 31char name[20];    // 文件名 32}LS; 
 33 34// 获取文件的模式 35char* file_mode(mode_t m,char* str)
 36{
 37if(S_ISREG(m))
 38         str[0] = ‘-‘;
 39elseif(S_ISDIR(m))
 40         str[0] = ‘d‘;
 41elseif(S_ISCHR(m))
 42         str[0] = ‘c‘;
 43elseif(S_ISBLK(m))
 44         str[0] = ‘b‘;
 45elseif(S_ISFIFO(m))
 46         str[0] = ‘q‘;
 47elseif(S_ISLNK(m))
 48         str[0] = ‘l‘;
 49//    else if(S_ISSOCK(m))
 50//        str[0] = ‘s‘; 51else 52         str[0] = ‘?‘;
 53 54     str[1] = ‘\0‘;
 55 56     strcat(str,S_IRUSR&m?"r":"-");
 57     strcat(str,S_IWUSR&m?"w":"-");
 58     strcat(str,S_IXUSR&m?"x":"-");
 59 60     strcat(str,S_IRGRP&m?"r":"-");
 61     strcat(str,S_IWGRP&m?"w":"-");
 62     strcat(str,S_IXGRP&m?"x":"-");
 63 64     strcat(str,S_IROTH&m?"r":"-");
 65     strcat(str,S_IWOTH&m?"w":"-");
 66     strcat(str,S_IXOTH&m?"x":"-");
 67 68return str;
 69}
 70 71// 获取目录的数量 72int dir_count(char* path)
 73{
 74     DIR *dir;
 75     dir = opendir(path);
 76struct dirent *dirent;
 77int count = 0;
 78while((dirent = readdir(dir)) != NULL)
 79    {
 80if(dirent->d_type == 4)
 81             count++;
 82    }
 83    closedir(dir);
 84return count;
 85}
 86 87// 是否是目录或目录下有目录 88int is_dir(struct dirent *dirent)
 89{
 90char* a = dirent->d_name;
 91if(dirent->d_type == 8)
 92return1;
 93if(dirent->d_type == 4)
 94    {
 95if(dir_count(a) == 0)
 96return2;
 97else 98return dir_count(a);
 99    }
100}
101102// 获取用户名103char* file_user(uid_t st_uid,char* str)
104{
105struct passwd *user;
106     user = getpwuid(st_uid);
107     sprintf(str,"%s",user->pw_name);
108return str;
109}
110111// 获取组名112char* file_group(uid_t st_uid,char* str)
113{
114struct passwd *user;
115     user = getpwuid(st_uid);
116struct group *grp;
117     grp = getgrgid(user->pw_gid);
118     sprintf(str,"%s",grp->gr_name);
119return str;
120}
121122// 获取文件大小123 off_t file_size(struct stat buf)
124{
125     off_t size = buf.st_size;
126return size;
127}
128129// 获取最后修改时间130char* file_time(time_t mt,char* str)
131{
132struct tm* t = localtime(&mt);
133     sprintf(str,"%d月 %02d %02d:%02d",t->tm_mon+1,t->tm_mday,t->tm_hour,t->tm_min);
134return str;
135}
136137// 获取文件的数量138int file_count(char* path)
139{
140     DIR *dir;
141     dir = opendir(path);
142struct dirent *dirent;
143int count = 0;
144while((dirent = readdir(dir)) != NULL)
145    {
146         count++;
147    }
148    closedir(dir);
149return count;
150}
151152// 交换153void equal(LS *a,LS *b)
154{
155     strcpy(a->mode,b->mode);
156     a->dir_num = b->dir_num;
157     strcpy(a->user,b->user);
158     strcpy(a->group,b->group);
159     a->size = b->size;
160     strcpy(a->time,b->time);
161     a->st_mode = b->st_mode;        
162     strcpy(a->name,b->name);
163}
164165// 排序166void sort(LS *info,int index)
167{
168     LS *temp = (LS*)malloc(sizeof(LS));
169for(int i=index-1; i>0; i--)
170    {
171for(int j=0; j<i; j++)
172        {
173if(strcmp(info[i].name,info[j].name)<0)
174            {
175                 equal(temp,&info[i]);
176                 equal(&info[i],&info[j]);
177                 equal(&info[j],temp);
178            }
179        }
180    }
181}
182183// 输出结构体184void show_ls(LS *info,int index)
185{
186for(int i=0; i<index; i++)
187    {    
188//printf("%d: ",i);189         printf("%s \033[0m",info[i].mode);
190         printf("%d ",info[i].dir_num);
191         printf("%s ",info[i].user);
192         printf("%s ",info[i].group);
193         printf("%5ld ",info[i].size);
194         printf(" %s ",info[i].time);
195//printf("%d ",info[i].st_mode);        196if(16893 == info[i].st_mode)
197        {
198// 颜色199             printf("\033[34m\033[1m%s\033[0m",info[i].name);
200        }
201elseif(33277 == info[i].st_mode)
202        {
203             printf("\033[32m\033[1m%s\033[0m",info[i].name);
204        }
205else206        {
207             printf("%s",info[i].name);
208        }
209if(i < index)
210             printf("\n");
211    }
212//printf("循环结束\n");213}
214215// 创建结构体，赋值216 LS *create(struct stat buf,struct dirent *dirent)
217{
218     LS* info = (LS*)malloc(sizeof(LS));
219char str[50] = {};
220//puts(file_mode(buf.st_mode,str));221     strcpy(info->mode,file_mode(buf.st_mode,str));
222//puts(info->mode);223     info->dir_num = is_dir(dirent);
224     strcpy(info->user,file_user(buf.st_uid,str));
225     strcpy(info->group,file_group(buf.st_uid,str));
226     info->size = file_size(buf);
227     strcpy(info->time,file_time(buf.st_mtime,str));
228     info->st_mode = buf.st_mode;        
229     strcpy(info->name,dirent->d_name);
230231return info;
232}
233234int main(int argc,char* argv[])
235{
236    LS info[MAX_FILE_NUM];
237char* l = "-l";
238if(strcmp(argv[1],l) != 0)
239    {
240         printf("\"ls：无法识别的选项\"%s\"\n",argv[1]);
241         printf("请尝试执行\"ls --help\"来获取更多信息。\n");
242return0;
243    }
244char* a = ".";
245char* b = "..";
246char* path = malloc(10000);
247     strcpy(path,"./");    // 只支持当前路径248int count = file_count(path);
249250     DIR *dir;
251     dir = opendir(path);
252struct dirent *dirent;
253int index = 0;    // 结构体下标254int blocks = 0;
255for(int i=0; i<count; i++)
256    {
257         dirent = readdir(dir);
258struct stat buf = {};
259if(stat(dirent->d_name,&buf))
260        {
261             perror("stat");
262return -1;
263        }
264265// 跳过特殊情况266if(strcmp(dirent->d_name,a)==0 || strcmp(dirent->d_name,b)==0)
267continue;
268         blocks += buf.st_blocks;
269//printf("%d\n",blocks);270         info[index++] = *create(buf,dirent);
271    }
272    closedir(dir);
273//printf("文件总数:%d\n",index);
274//show_ls(info,index);    275276     printf("总用量 %d\n",blocks/2);
277    sort(info,index);
278    show_ls(info,index);
279return0;
280 }