簡單實現ls的 -l -i -a -h 功能
阿新 • • 發佈：2019-03-16
filename errno link clu fail lock 判斷 define ifs
#include<stdio.h> #include<sys/types.h> #include<sys/stat.h> #include<unistd.h> #include<string.h> #include<errno.h> #include<pwd.h> #include<grp.h> #include<time.h> #include<dirent.h> #include<glob.h> #include<stdlib.h> #defineBUFSIZE 1024 int ls_l(const char *path); int ls_i(const char *path); int ls_a(const char *path); int ls_h(const char *path); static int num; static char *buf_cat(const char *path, const char *name) { char *bufcat = malloc(BUFSIZE); memset(bufcat,‘\0‘,BUFSIZE); strcpy(bufcat,path); strcat(bufcat,"/"); strcat(bufcat,name); return bufcat; } // 判斷是否為隱藏文件 static int hide(const char *path) { if(*path == ‘.‘) return 1; else return 0; } int ls_l_1(const char *path,const char *name){ struct stat mystat; struct passwd *pwd = NULL; struct tm *tmp = NULL;struct group *grp = NULL; char *buf = NULL; buf = buf_cat(path,name); if(lstat(buf, &mystat) == -1){ perror("stat()"); return 1; } if(hide(name) == 0){ num +=mystat.st_blocks/2; switch(mystat.st_mode & S_IFMT){ case S_IFREG: printf("-"); break; case S_IFBLK: printf("b"); break; case S_IFDIR: printf("d"); break; case S_IFCHR: printf("c"); break; case S_IFSOCK: printf("s"); break; case S_IFLNK: printf("l"); break; case S_IFIFO: printf("p"); break; default: break; } //所有者權限 if(mystat.st_mode & S_IRUSR) putchar(‘r‘); else putchar(‘-‘); if(mystat.st_mode & S_IWUSR) putchar(‘w‘); else putchar(‘-‘); if(mystat.st_mode & S_IXUSR){ if(mystat.st_mode &S_ISUID){ putchar(‘s‘); }else putchar(‘x‘); }else putchar(‘-‘); //所屬組權限 if(mystat.st_mode & S_IRGRP) putchar(‘r‘); else putchar(‘-‘); if(mystat.st_mode & S_IWGRP) putchar(‘w‘); else putchar(‘-‘); if(mystat.st_mode & S_IXGRP){ if(mystat.st_mode &S_ISGID){ putchar(‘s‘); }else putchar(‘x‘); }else putchar(‘-‘); //其他人權限 if(mystat.st_mode & S_IROTH) putchar(‘r‘); else putchar(‘-‘); if(mystat.st_mode & S_IWOTH) putchar(‘w‘); else putchar(‘-‘); if(mystat.st_mode & S_IXOTH){ if(mystat.st_mode &S_ISVTX){ putchar(‘t‘); }else putchar(‘x‘); }else putchar(‘-‘); //硬鏈接 printf(" %ld ",mystat.st_nlink); //文件擁有者名 pwd = getpwuid(mystat.st_uid); printf("%s ", pwd->pw_name); //文件所屬組 grp = getgrgid(mystat.st_gid); printf("%s ",grp->gr_name); //總字節個數 printf("%ld ", mystat.st_size); //獲取文件時間 tmp = localtime(&mystat.st_mtim.tv_sec); //if error if(tmp == NULL) return 1; strftime(buf, BUFSIZE, "%m月 %d %H:%M",tmp); printf("%s ", buf); //文件名 printf("%s ", name); putchar(‘\n‘); } return 0; } // ls -l int ls_l(const char *path) { DIR *dp = NULL; struct dirent *entry = NULL; char buf[BUFSIZE] = {}; struct stat sstat; if(lstat(path,&sstat) == -1){ perror("stat()"); return 1; } if(S_ISREG(sstat.st_mode)){ ls_l_1(".", path); }else{ dp = opendir(path); if(dp == NULL){ perror("opendir()"); return 1; } while(1){ entry = readdir(dp); if(NULL == entry){ if(errno){ perror("readdir()"); closedir(dp); return 1; } break; } ls_l_1(path, entry->d_name); } printf("總用量：%d\n", num); closedir(dp); } return 0; } int ls_i(const char *path) { struct stat mystat; glob_t myglob; char buf[BUFSIZE]={}; if(lstat(path,&mystat)<0) { perror("lstat()"); return -1; } if(!S_ISDIR(mystat.st_mode)) { printf("%ld %s\n",mystat.st_ino,path); } strcpy(buf,path); strcat(buf,"/*"); glob(buf,0,NULL,&myglob); // memset(buf,‘\0‘,BUFFSIZE); for(int i=0;i<myglob.gl_pathc;i++) { if(lstat(((myglob.gl_pathv)[i]),&mystat)<0) { perror("lstat()"); return -1; } char *o=strrchr((myglob.gl_pathv)[i],‘/‘); printf("%ld %s\n",mystat.st_ino,++o); } globfree(&myglob); } //ls -a int ls_a(const char *path) { struct stat mystat; struct dirent *entry = NULL; DIR *dp = NULL; if(lstat(path,&mystat)<0) { perror("lstat()"); return -1; } dp=opendir(path); if(dp == NULL) { perror("opendir()"); return -1; } while(1) { entry = readdir(dp); if(entry == NULL) { if(errno) { perror("readdir()"); closedir(dp); return -1; } break; } printf("%s ",entry->d_name); printf("\n"); } closedir(dp); return 0; } //ls -h int ls_h(const char *path) { struct stat mystat; struct dirent *entry = NULL; char *filename = NULL; char buf[BUFSIZE] = {}; glob_t myglob; if(lstat(path,&mystat)<0) { perror("lstat()"); return -1; } if(S_ISDIR(mystat.st_mode)) { strcpy(buf, path); strcat(buf, "/*"); if(glob(buf, 0, NULL, &myglob) != 0) { fprintf(stderr, "glob() is failed"); return -1; } for(int i = 0; i < myglob.gl_pathc; i++) { filename =strrchr((myglob.gl_pathv)[i], ‘/‘); printf("%s\n", filename + 1); } } globfree(&myglob); return 1; } int main(int argc, char *argv[]) { int c; char *optstring ="-l::a::i::h::"; if(argc < 2) return 1; while(1){ c =getopt(argc, argv, optstring); if(c == -1) break; switch (c) { case ‘l‘: ls_l(argv[2]); break; case ‘a‘: ls_a(argv[2]); break; case ‘i‘: ls_i(argv[2]); break; case ‘h‘: ls_h(argv[2]); break; case ‘?‘: printf("不認識此選項%s\n", argv[optind -1]); break; // case 1:printf("%s\n", argv[optind -1]);break; default: break; } } return 0; }
簡單實現ls的 -l -i -a -h 功能