Chapter 8 - The UNIX System Interface 5

Modify the fsize program to print the other information contained in the inode entry.

Solution by Akil Adeshwar

/*
   Modify the fsize program to print the other information contained in the inode entry.
   */

#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <dirent.h>
#include <pwd.h>

#define MAX_PATH 1024

#ifndef DIRSIZ
#define DIRSIZ 14
#endif

void dirwalk( char *dir,void (*fcn)(char *)){

 char name[MAX_PATH];
 struct dirent *dp;
 DIR *dfd;

 if((dfd = opendir(dir))==NULL){
  puts("Error: Cannot open Directory");
  return;
 }
 puts(dir);
 // Get each dir entry
 while((dp=readdir(dfd)) != NULL){
  // Skip . and .. is redundant.
  if(strcmp(dp->d_name,".") == 0
   || strcmp(dp->d_name,"..") ==0 )
   continue;
  if(strlen(dir)+strlen(dp->d_name)+2 > sizeof(name))
   puts("Error: Name too long!");
  else{
   sprintf(name,"%s/%s",dir,dp->d_name);
   // Call fsize
   (*fcn)(name);
  }
 }
 closedir(dfd);
}

void fsize(char *name){
 struct stat stbuf;

 if(stat(name,&stbuf) == -1){
  puts("Error: Cannot get file stats!");
  return;
 }

 if((stbuf.st_mode & S_IFMT) == S_IFDIR){
  dirwalk(name,fsize);
 }
 struct passwd *pwd = getpwuid(stbuf.st_uid);
 //print file name,size and owner
 printf("%81d %s Owner: %s\n",(int)stbuf.st_size,name,pwd->pw_name);
}

 

int main(int argc,char *argv[]){

 if(argc==1)
  fsize(".");
 else
  while(--argc>0)
   fsize(*++argv);
 return 0;
}