NAME

       scandir, alphasort - scan a directory for matching entries

SYNOPSIS

       #include <dirent.h>

       int scandir(const char *dir, struct dirent ***namelist,
              int (*select)(const struct dirent *),
              int (*compar)(const struct dirent **, const struct dirent **));

       int alphasort(const struct dirent **a, const struct dirent **b);

DESCRIPTION

       The  scandir() function scans the directory dir, calling select() on each directory entry.
       Entries for which select() returns non-zero are stored in strings allocated via  malloc(),
       sorted  using  qsort()  with  the  comparison  function  compar(),  and collected in array
       namelist which is allocated via malloc().  If select is NULL, all entries are selected.

       The alphasort() function can be used as the comparison function for the scandir() function
       to  sort  the  directory  entries  into  alphabetical  order.   Its parameters are the two
       directory entries, a and b, to compare.

RETURN VALUE

       The scandir() function returns the number of directory entries selected or -1 if an  error
       occurs.

       The  alphasort()  function returns an integer less than, equal to, or greater than zero if
       the first argument is considered to be respectively less than, equal to, or  greater  than
       the second.

ERRORS

       ENOMEM Insufficient memory to complete the operation.

CONFORMING TO

       BSD 4.3

EXAMPLE

       /* print files in current directory in reverse order */
       #include <dirent.h>
       main(){
           struct dirent **namelist;
           int n;

           n = scandir(".", &namelist, 0, alphasort);
           if (n < 0)
               perror("scandir");
           else
               while(n--) printf("%s\n", namelist[n]->d_name);
       }

SEE ALSO

       opendir(3), readdir(3), closedir(3), rewinddir(3), telldir(3), seekdir(3).