Assignment 1 -C program to obtain a program to a directory in a given directory – System Programming

Write a C program to obtain a program, called
ndFile, to nd a le/directory in a given directory. In particular, your program
 takes an optional target directory argument and a “le name” to look for.
Synopsis: findFile [targetDirectory]
Call examples:
ndFile /usr/include/ stdio.h : search for stdio.h in /usr/include/
ndFile labs : search for labs in current directory
 look in the target directory for the “le name” and, if found, prints a line with
the name found followed by either “this is a le” or “this is a directory”.
Hints:
 All system calls needed to solve this problem are in the example myLs.c, that
we have seen in class.
 You can use the opendir() system call to distinguish between a regular le
and a directory. If the item is a regular le, then the opendir() system call
will return NULL.
 Ignore the two special directories . and ..

Answer:

#include <sys/types.h>
#include <dirent.h>
#include <stdio.h>

int checkF(const char *fname)
{
    FILE *file;
    if ((file = fopen(fname, "r")))
    {
        fclose(file);
        return 1;
    }
    return 0;
}


int main(int argc, char *argv[]){
	DIR *dp;
	struct dirent *dirp;
    
  
	if (argc == 1){
		printf("No filename given.\n");
		return 0;
	}
	else
		dp = opendir("./");
    
	while ((dirp=readdir(dp)) != NULL)
		if(checkF(argv[1]) == 1)
            printf("Found and it is a file");
        else
            printf("Not found");
    
	closedir(dp);
	return 0;
}