i want a c program which scan all the subdirectories of a directory and read all the files and store the contents of the file at one place. Thanking in advance.

Write one then. Homework or not, people aren't really here to do things for you. If you're stuck with something, post what you've done and ask for help.

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Read up on the functions stat() and lstat() as well as fread(), fwrite(), fopen() and fclose().

Hi,
Few days back i wrote a code to scan the directory and display all the files.
u can modify the code to store the contents at one place. To study in detail u can follow Begginning Linux Programming by Neil matthews and Richard Stones, and C programming by Dennis Rittchie.
This should help.


#include <unistd.h>
#include <stdio.h>
#include <dirent.h>
#include <string.h>
#include <sys/stat.h>
#include <stdlib.h>

void dirwalk(char *,int);

main()
{
printf("Directory scan of /home/surendra/Linuxcodes:\n");
dirwalk("/home/surendra/Linuxcodes",0);
printf("done.\n");
return(0);
}

void dirwalk(char *dir,int depth)
{
DIR *dp;
char str[30];
char name[30];
struct dirent *entry;
struct stat statbuf;

if((dp = opendir(dir)) == NULL)
{
fprintf(stderr,"Cannot open directory: %s\n",dir);
return;
}

chdir(dir);

while((entry = readdir(dp)) != NULL)
{
lstat(entry->d_name,&statbuf);
if(S_ISDIR(statbuf.st_mode))
{
/* Found a directory ,but ignore . and .. */
if(strcmp(".",entry->d_name) ==0 || strcmp("..",entry->d_name) == 0)
continue;
printf("%*s %s/\n",depth,"",entry->d_name);

/*funtion is called recursively at a new indent level */
dirwalk(entry->d_name,depth + 4);
}
else
if(S_ISREG(statbuf.st_mode))
printf("%*s %s \n",depth,"",entry->d_name); /*Here you need to add u'r code*/
strcpy(str,entry->d_name);
strcpy(name,str);

printf("\nFile name is %s\n",name);
}

chdir("..");
closedir(dp);
}

1 members found this post helpful.

man ftw (file tree walk), the code already exists in a library.

2 members found this post helpful.

Here is my code which lists all the subdirectories with its id instead of name now i m stuck how to read each file in each directory by usind its id(catid) and collect all files data at one place line by line...



#define MAX_CATEGORIES 100

int main()
{
DIR *d;
char *dir_name="/home/anuradha/ufilter/blacklists";
struct category{
short catid;
char catname[100];
};
struct category cat[MAX_CATEGORIES];
int counter=0;

/*open a current directory*/
d=opendir(dir_name);
if(!d)
{
fprintf(stderr, "cannot open '%s' :%s",dir_name,strerror(errno));
exit(EXIT_FAILURE);

}

struct dirent * entry;
while(1)
{
entry=readdir(d);
if(entry==NULL)
{
break;
}
counter++;
cat[counter].catname[0] = '\0';
strncpy (cat[counter].catname, entry->d_name, sizeof(cat[counter].catname));
cat[counter].catid = counter;

}

/*Close the directory.*/
if(closedir(d))
{
fprintf(stderr, "could not close '%s' : %s\n",dir_name,strerror(errno));
exit(EXIT_FAILURE);
}
return 0;
}

I think u'r task will be much easier if u use shell script.

The index into the array is basically the same as catid (if I see it correctly both are based on counter). So you can iterate through the array by using the counter.

Do you want one line of file 1 followed by one line of file 2 followed by one line of file 3; and next do the second line of each file? Or do you want file 1 followed by file 2 followed by file 3 etc.

As you're talking about lines, I assume that those files are text files. In which case you can use fopen(), fgets(), fputs() and fclose().

1 members found this post helpful.

hahaha!