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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).