Programming

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

int
main (void)
{
    int i, c, ac;
    unsigned int list_size = 10;
    char * fname;
    
    DIR *pdir;
    struct dirent *pde;
    
    
    struct entry {
        struct stat st;
        struct dirent *pde;
    };
    
    struct list {
        int count;
        struct entry **entries;
    } list;
    
    struct entry **ppent;
    pdir = NULL;
    pde = NULL;
    
    pdir = opendir("/usr/bin");
    
    if ((list.entries = malloc(list_size * sizeof(struct entry *))) == NULL)
        return 1;
    
    c = 0;
    ac = 0; /* allocation counter */
    while ((pde = readdir(pdir)) != NULL) {
        if (c > list_size - 1) {
            list_size <<= 1;
            if ((list.entries = realloc(list.entries,
                                    list_size * sizeof(struct entry*))) == NULL) {
                perror("unable to realloc");
                return 1;
            }
            ac++;
        }

        list.entries[c] = malloc(sizeof(struct entry));
        list.entries[c]->pde = pde;

        if (strcmp(list.entries[0]->pde->d_name, ".") != 0) {
            printf("memory corruption. size of array %d items\n", c);
            printf("number of reallocations %d\n", ac);
            return 1;
        }
        
        printf("base address: %p pointer address: %p entry pointer value: %p name: %s\n",
               list.entries, &list.entries[c], list.entries[c], list.entries[c]->pde->d_name);
        c++;
    }
    
    return 0;
}

struct entry {
        struct stat st;
        struct dirent de;
    };

...

list.entries[c]->de = *pde;

...

struct entry {
        struct stat st;
        struct dirent pde;
    };