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| /*
* Draft by Sam at 06-16-2019
* show the metadata of a file
* */
#include <sys/stat.h>
#include <time.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
/* display the file permision
* mode_t(file type and mode) of statBuffer as a parameter
* */
void disFilePerm(mode_t filePerm){
char userR = 0, userW = 0, userX = 0;
char groupR = 0, groupW = 0, groupX = 0;
char otherR = 0, otherW = 0, otherX = 0;
userR = (filePerm & S_IRUSR) ? 'r' : '-';
userW = (filePerm & S_IWUSR) ? 'w' : '-';
userX = (filePerm & S_IXUSR) ? 'x' : '-';
groupR = (filePerm & S_IRGRP) ? 'r' : '-';
groupW = (filePerm & S_IWGRP) ? 'w' : '-';
groupX = (filePerm & S_IXGRP) ? 'x' : '-';
otherR = (filePerm & S_IROTH) ? 'r' : '-';
otherW = (filePerm & S_IWOTH) ? 'w' : '-';
otherX = (filePerm & S_IXOTH) ? 'x' : '-';
printf("Mode:\t\t\t\t\t%c%c%c%c%c%c%c%c%c\n",userR,userW,userX,groupR,groupW,groupX,otherR,otherW,otherX);
}
/*
* display the stat buffer
* the pointer of statBuffer as parameter
* */
void displayStatInfo(struct stat *statBuffer, const char *filepath){
printf("\n===================== File Metadata ==============================\n\n");
/* print the file type */
printf("Directory:\t\t\t\t%s\n",filepath);
printf("File type:\t\t\t\t");
switch (statBuffer->st_mode & S_IFMT) {
case S_IFREG: printf("Regular file\n"); break;
case S_IFDIR: printf("Directory\n"); break;
case S_IFCHR: printf("Character device\n"); break;
case S_IFBLK: printf("Block device\n"); break;
case S_IFLNK: printf("Symbolic (soft) link\n"); break;
case S_IFIFO: printf("FIFO or pipe\n"); break;
case S_IFSOCK: printf("Socket\n"); break;
default: printf("Unknown file type\n"); break;
}
printf("Device containing:\t\t\tmajor=%ld minor=%ld\n",(long) major(statBuffer->st_dev), (long) minor(statBuffer->st_dev));
printf("inode number:\t\t\t\t%ld\n", (long) statBuffer->st_ino);
disFilePerm(statBuffer->st_mode);
if (S_ISCHR(statBuffer->st_mode) || S_ISBLK(statBuffer->st_mode)){
printf("Device number (st_rdev):\t\tmajor=%ld; minor=%ld\n",(long) major(statBuffer->st_rdev), (long) minor(statBuffer->st_rdev));
}
printf("Number of (hard) links:\t\t\t%ld\n", (long) statBuffer->st_nlink);
printf("Ownership:\t\t\t\tUID=%ld GID=%ld\n", (long) statBuffer->st_uid, (long) statBuffer->st_gid);
printf("File size:\t\t\t\t%lld bytes : %lld KB\n", (long long) statBuffer->st_size, statBuffer->st_size/1024);
printf("I/O block size:\t\t\t\t%ld bytes\n", (long) statBuffer->st_blksize);
printf("Number of (512B) blocks allocated:\t%lld\n", (long long) statBuffer->st_blocks);
printf("Last file access:\t\t\t%s", ctime(&statBuffer->st_atime));
printf("Last file modification:\t\t\t%s", ctime(&statBuffer->st_mtime));
printf("Last status change:\t\t\t%s", ctime(&statBuffer->st_ctime));
printf("\n==================================================================\n\n");
}
/*
* return data
* 1 for Invalid patameters
* 2 for lstat error
* 0 for sucess
* */
int main(int argc, char *argv[]){
struct stat statBuffer;
if (argc != 2 || argv[1] == NULL){
printf("Usage: filemetadata <FILENAME> \n");
return 1;
}
/* just use lstat to show the info; because lstat() is identical to stat(), except that if pathname is a symbolic link, then it returns information about the link
* itself, not the file that it refers to.
*/
if (lstat(argv[1], &statBuffer) == -1){
perror("filemetadata");
return 2;
}
displayStatInfo(&statBuffer, argv[1]);
return 0;
}
|
