Enumerating Files in a directory in C

tristan_vdv · 05-24-2002, 10:11 PM

Hi,
here is another file system question:
In Linux, how do you get a list of the files in a directory in C? In windows you used the findfirstfile etc api, i have no idea how to do it in linux.

Thanks in advance!
Tristan

tyler_durden · 05-24-2002, 11:32 PM

here, check this out

http://www.cs.cf.ac.uk/Dave/C/node20...00000000000000

crabboy · 05-25-2002, 07:43 PM

Code:

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

int main (int argc, char * argv[])
{
    struct stat stDirInfo;
    struct dirent * stFiles;
    DIR * stDirIn;
    char szFullName[MAXPATHLEN];
    char szDirectory[MAXPATHLEN];
    struct stat stFileInfo;
    short int mode;

    if ( argc == 2 )
        strncpy( szDirectory, argv[1], MAXPATHLEN - 1 );
    else
        exit(-1);

    if (lstat( szDirectory, &stDirInfo) < 0)
    {
        perror (szDirectory);
        return;
    }
    if (!S_ISDIR(stDirInfo.st_mode))
        return;
    if ((stDirIn = opendir( szDirectory)) == NULL)
    {
        perror( szDirectory );
        return;
    }
    while (( stFiles = readdir(stDirIn)) != NULL)
    {
        sprintf(szFullName, "%s/%s", szDirectory, stFiles -> d_name );

        if (lstat(szFullName, &stFileInfo) < 0)
           perror ( szFullName );

        /* is the file a directory? */
        if (S_ISDIR(stFileInfo.st_mode))
        {
            printf( "Directory: %s\n", szFullName );
        }
        else
        {
            printf( "Filename: %s\n", szFullName );
        }
/*
        if ( S_ISLNK( stFileInfo.st_mode ))
           printf("is link\n");
*/

    }  // end while
    closedir(stDirIn);
    return;
}  // end main

tristan_vdv · 05-25-2002, 10:29 PM

Thanks guys.
Is there much difference between using scandir or opendir and readdir? ie a big speed or compatability difference?