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 9.2 |