C / C++ / MFC

#include <sys/types.h>  // for scandir
#include <sys/dir.h>    // for alphasort and structure dirent 
#include <sys/param.h>  // for MAXPATHLEN and getwd
#include <stdio.h>
 
#define FALSE 0
#define TRUE !FALSE
 
extern  int alphasort();// extern extend the visiblity of the function alphasort 
                        //alphasort used as the comparison function for the scandir() line no 24 function to sort the directory
 
char pathname[MAXPATHLEN];
 
main()   { int count,i;
				struct direct **files;//pointer to a pointer ,which point to the object call files here
				int file_select();
 
				if (getwd(pathname) == NULL ) // return absolute file name of current directory
						{ printf("Error getting path\n");
								exit(0);
						}
				printf("Current Working Directory = %s\n",pathname);
				count =
				  scandir(pathname, &files, file_select, alphasort);//scandir returns the current directory (.) and the 									directory above this (..) as well as all files so we need to check
 
				/* If no files found, make a non-selectable menu item */
				if 		(count <= 0)
						{		 printf("No files in this directory\n");
								exit(0);
						}
				printf("Number of files = %d\n",count);
				for (i=1;i<count+1;++i)
						 printf("\n%s\n  ",files[i-1]->d_name);
				printf("\n"); /* flush buffer */
		}



int file_select(struct direct   *entry)
 { char *ptr;
   char *rindex(char *s, char c);
		 if ((strcmp(entry->d_name, ".") == 0) ||
						(strcmp(entry->d_name, "..") == 0))
						 return (FALSE);
  						 // checking of its extension 
						ptr = rindex(entry->d_name, '.');
				 if ((ptr != NULL) &&
						 ((strcmp(ptr, ".c") == 0) ||
						  (strcmp(ptr, ".txt") == 0) ||
						  (strcmp(ptr, ".m") == 0) ))
								 return (TRUE);
									else
									return (FALSE);
		}