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/* lsl.cpp: This program produces output somewhat like the ls -l command on UNIX. It uses a variety of UNIX system calls. Copyright (c) Howard J. Hamilton, 1994, 2002 total 1687 -rw------- 1 hamilton csfac 2319 Aug 17 1993 README -rw------- 1 hamilton csfac 860160 Jan 17 14:35 howard.tar -rw------- 1 hamilton csfac 0 Jan 18 21:26 out drwx------ 2 hamilton csfac 512 Jan 17 14:36 ps drwx------ 2 hamilton csfac 512 Jan 17 14:36 troff */ #include #include #include #include #include #include #include #define MAX_SIZE 1024 void print_group(gid_t gid); void print_perm(int perm); void print_user(uid_t uid); int main() { char dirname[MAX_SIZE]; char filename[MAX_SIZE]; char buffer[MAX_SIZE]; DIR *dirp; struct direct *dp; struct stat buf; struct stat *sp = &buf; int stat_status; strcpy(dirname, "."); dirp = opendir(dirname); if (dirp == NULL) { fprintf(stderr, "No such directory as %s\n", dirname); exit(1); } while ((dp = readdir(dirp)) != NULL) { sprintf(filename, "/home/castor1/hamilton/courses/330/%s/%s", dirname, dp->d_name); sprintf(filename, "%s", dp->d_name); stat_status = stat(filename, sp); if (stat_status == -1) { perror("lsl"); } /* printf("Inode = %d\n", sp->st_ino); printf("Mode = %o\n", sp->st_mode); */ print_perm(sp->st_mode); printf(" %4d ", sp->st_nlink); /* printf("uid = %d\n", sp->st_uid); */ print_user(sp->st_uid); printf(" "); print_group(sp->st_gid); printf("%8li ", (long) sp->st_size); strcpy(buffer, ctime(&(sp->st_mtime))); buffer[16] = '\0'; /* remove newline */ printf(&buffer[4]); printf(" %s\n", dp->d_name); } closedir(dirp); return 0; } void print_perm(int perm) { printf("-"); if ((perm & S_IRUSR) == S_IRUSR) printf("r"); else printf("-"); if ((perm & S_IWUSR) == S_IWUSR) printf("w"); else printf("-"); if ((perm & S_IXUSR) == S_IXUSR) printf("x"); else printf("-"); if ((perm & S_IRGRP) == S_IRGRP) printf("r"); else printf("-"); if ((perm & S_IWGRP) == S_IWGRP) printf("w"); else printf("-"); if ((perm & S_IXGRP) == S_IXGRP) printf("x"); else printf("-"); if ((perm & S_IROTH) == S_IROTH) printf("r"); else printf("-"); if ((perm & S_IWOTH) == S_IWOTH) printf("w"); else printf("-"); if ((perm & S_IXOTH) == S_IXOTH) printf("x"); else printf("-"); /* S_IWUSR 00200 Write by owner. S_IXUSR 00100 Execute (search if a directory) by owner. S_IRWXG 00070 Read, write, execute by group. S_IRGRP 00040 Read by group. S_IWGRP 00020 Write by group. S_IXGRP 00010 Execute by group. S_IRWXO 00007 Read, write, execute (search) by others. S_IROTH 00004 Read by others. S_IWOTH 00002 Write by others S_IXOTH 00001 Execute by others. */ } void print_user(uid_t uid) { struct passwd *p; p = getpwuid(uid); printf("%-8s", p->pw_name); } void print_group(gid_t gid) { struct group *g; g = getgrgid(gid); printf("%-8s", g->gr_name); }