| SCANDIR(3) | Library Functions Manual | SCANDIR(3) | 
scandir, alphasort —
#include <sys/types.h>
#include <dirent.h>
int
  
  scandir(const
    char *dirname, struct
    dirent ***namelist, int
    (*select)(const struct dirent *),
    int (*compar)(const struct
    dirent **, const struct dirent **));
int
  
  alphasort(const
    struct dirent **d1, const
    struct dirent **d2);
scandir() function reads the directory
  dirname and builds an array of pointers to directory
  entries using malloc(3). It
  returns the number of entries in the array. A pointer to the array of
  directory entries is stored in the location referenced by
  namelist.
The select parameter is a pointer to a user
    supplied subroutine which is called by scandir() to
    select which entries are to be included in the array. The select routine is
    passed a pointer to a directory entry and should return a non-zero value if
    the directory entry is to be included in the array. If
    select is null, then all the directory entries will be
    included.
The compar parameter is a pointer to a user supplied subroutine which is passed to qsort(3) to sort the completed array. If this pointer is null, the array is not sorted.
The alphasort() function is a routine
    which can be used for the compar parameter to sort the
    array alphabetically.
The memory allocated for the array can be deallocated with free(3), by freeing each pointer in the array and then the array itself.
scandir() and alphasort()
  functions conform to IEEE Std 1003.1-2008
  (“POSIX.1”).
scandir() and alphasort()
  functions appeared in 4.2BSD.
They were changed in NetBSD 8.0 to use
    “struct dirent **” instead of “void *” for the
    comparison function, including alphasort().
| December 15, 2016 | NetBSD 9.3 |