C: Sorted Walk Through Directory Contents

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#include <stdio.h> #include <stdlib.h> #include <dirent.h>   void walk_dir(const char *path) {  struct dirent **namelist;  int i, n;    n = scandir(path, &namelist, NULL/*filter*/, alphasort);  if (n < 0)  {   perror("scandir");  } else {   for (i = 0; i < n; i++) {    printf("Entry: %s\n", namelist[i]->d_name);    free(namelist[i]);   }   free(namelist);  } }   int main(void) {  walk_dir("/tmp");  return EXIT_SUCCESS; }