Question

Write a C program countFiles.c to be executed on the command line as follows:

countFiles <directory>

The program should count the (regular) files in the specified directory as well as all subdirectories and output the total number on the console. Files and subdirectories whose names .start with should be ignored!

To do this, define a function int countFilesRec(char* dirName)that dirName returns the number of (regular) files in the directory and all the subdirectories. Call the function recursively to count the files in the subdirectories. Note that you may need to concatenate the directory names appropriately in the recursive call.

Note: Use the C functions for implementation opendir, readdir and closedir

Test: With the following command line call you can determine the number of files in a directory and all subdirectories under Linux for comparison with your program under Linux:

find <directory> -type f | wc -l

Answer 1

solution:
This solution has a full explanation, full c code, comments with code and screenshot of

execution of the program for your clear and better understanding.

EXPLANATION:

Before going to directly answer first let's see the approach for solving this problem.

First, open dir and find all regular files and then if subdirectory found then recursively find all the subregular files from that sub dir.

and after reading all the dir finally close them.

For more visualization see below:

c code :

// header files
#include<stdio.h>
#include <dirent.h>
#include<string.h>
#include<stdlib.h>
// variables to count files
int fileCount,count;
char *pathP;
// function to count total files
int countFiles(char *path){
   count++;
   // DIR object ptr
   DIR *dirp;
   struct dirent * entry;
   if(count>1){
   // adding path name
   strcat(pathP,"/");
   strcat(pathP,path);
   dirp = opendir(pathP);
   }
   else dirp = opendir(path);
   // for error check
   if(!dirp) {
       printf("\noops! Something goes wrong with system\n");
       exit(1);
   }
   // readdir to read a directory & checking for regular files
   while ((entry = readdir(dirp)) != NULL) {
if (entry->d_type == DT_REG) /* If the entry is a regular file */
fileCount++;
else if(entry->d_type == DT_DIR && strcmp(entry->d_name,".")!=0 && strcmp(entry->d_name,"..")!=0)
   countFiles(entry->d_name);
}
// close the dirp
   closedir(dirp);
  
   return fileCount;
}
// main function
int main(int argc,char *argv[]){
// scond argument is fileName
pathP = argv[1];
char *path = argv[1];
// calling function to count files
fileCount = countFiles(argv[1]);
printf("\nTotal Number of Files = %d\n",fileCount);
return 0;
}

screenshot:

This code is compiled and executed in visual studio code ide in ubuntu under LINUX.

since step by step with full comments, the code is provided for your full understanding.

EXPLORER C countFiles.cx int fileCount,count; 8 char *pathP; s (ch OPEN EDITORS jay@jay: -/Desktop/c++ 9//function to count total files 10 int countFiles(char *path) count++ // DIR object ptr DIR *dirp; xc countFiles.c jay@jay /Desktop/c++ javejay :-/Desktop/ C++, gcc countFiles.c ../...wni. Pinunet/il ygu ktt/kitny. 1..ฐ i vscode Total Number of Files 3 Jayejay: rent struct dirent entryjayejays $ find temp -type fIwc -l 4 temp entry; 1)f if(count>1)( // adding path name strcat (pathP,"") strcat(pathP,path); dirp opendir (pathP); sub jay@jay /Desktop/c++ thP, C subfile1.c thP, Cfile1. endi Cfile2.c else dirp opendir (path); /I for error check if(!dirp) a.out C countFiles.c ror printf("noops! Sor In" exit(1) /I readdir to read a direc while ((entry-readdir(di İf (entry--d-type-: DT-REG) /* If the entry is a regular file 28 291 while ((entry 29 if (entry->d fileCount++ else if(entry->d-type && strcmp (entry->d_name,".."!-0) countFiles (entry->d_name); 39 DT-DIR strcnp(entry->d-nane,".")!弌 && fileCount 30 else if(entry countFile 34 / close the dirp closedir (dirp); Iclose the closedir(dir 35 return fileCount; 36 9// main function 40 int main(int argc,char *argv[) 41// scond argument is fileName 42 pathP argv[1]; 3 char *path argv[1]; 44// calling function to count files 45 fileCount = countFiles(argv[1]); 46 printf("InTotal Number of Filesd\n", fileCount); eturn θ return fileCo 38 39// main function 40 int main(int arg 41 1/scond argument 42 pathP argv[1]: 43 char*path=arqu OUTLINE MAVEN PROJECTS

However further if any difficulty in understanding the code and approach

then feel free to ask in the comments section.

I will definitely help you.