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/* ============================================================================
# Create
# name  : Andre Rikkert de Koe          date:   Apr 2011
# descr : filefind
#         This is a demo of programming in the C language.
#         Its part of a project to implement a program to create a directory
#         tree similar to the output of the Unix find program.
# EUID  : Any user who has read access to all the files being searched for. 
# run   : interactive
#
# Changes
# name  :                               date:
# descr : short description
#
============================================================================ */

#include <string.h>

#include <stdio.h>
#include <libgen.h>
#include "checkfiles.h"
#include <unistd.h> // getcwd


#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <unistd.h>

#include <errno.h>

#define PATH_MAX 255

// ============================================================================
// Functions
// ============================================================================

void Usage(char *progname, char *mesg)
{
        printf("Usage: %s directory\n" ,progname);
        printf("%s\n", mesg);
}

// http://www.ibm.com/developerworks/aix/library/au-unix-readdir.html

void traverse(char *directory)
{
        char curdir[PATH_MAX];
        char curdir2[PATH_MAX]; 

        getcwd(curdir, PATH_MAX);
        chdir(directory);
        getcwd(curdir2, PATH_MAX);

        DIR *dir = NULL;
        struct dirent entry;
        struct dirent *entryPtr = NULL;
        int retval = 0;
        char pathName[PATH_MAX + 1];
        char pfile[PATH_MAX + 1];

        /* Open the given directory, if you can. */  
        dir = opendir(curdir2);
        if (dir == NULL)
        {
                printf( "Error opening %s: %s", directory, strerror( errno ) );
        }
        retval = readdir_r( dir, &entry, &entryPtr );
        while( entryPtr != NULL )
        {
                struct stat entryInfo;
        
                if( ( ! strncmp( entry.d_name, ".",  PATH_MAX ) == 0 ) && 
                    ( ! strncmp( entry.d_name, "..", PATH_MAX ) == 0 ) )
                {
                        sprintf(pfile,"%s/%s", curdir2, entry.d_name);
                        if (isdir(entry.d_name) && ! issymlink(entry.d_name))
                        {
                                printf("%s\n", pfile);
                                traverse(entry.d_name);
                        }
                        else
                        {
                                if ((isregular(entry.d_name)) || issymlink(entry.d_name))
                                        printf("%s\n", pfile);
                                else
                                        printf("WARRNING: Could not process file %s\n", entry.d_name);
                        }       
                }
                retval = readdir_r( dir, &entry, &entryPtr );
        }
        chdir(curdir);
}

void start_traverse(char *directory)
{
        printf("%s\n", directory);
        traverse(directory);
}

// ============================================================================
// MAIN
// ============================================================================

int main(int argc, char *argv[])
{
        char *progname = argv[0];
        char *directory;
        char mesg[80];

        progname = basename(progname);
        if (argc == 2)
        {
                directory = argv[1];
                if (isdir(directory))
                {
                        start_traverse(directory);
                }
                else
                {
                        sprintf(mesg, "ERROR: Not a directory : %s", directory);
                        Usage(progname, mesg);
                }
        }
        else
        {
                Usage(progname, "ERROR: 1 argument expected");
        }
}