SCANDIR(3C)							   SCANDIR(3C)

NAME    [Toc]    [Back]

     scandir, scandir64, alphasort, alphasort64	- scan a directory

SYNOPSIS    [Toc]    [Back]

   SysV:

     #include <sys/types.h>
     #include <dirent.h>

     int scandir(const char *dirname, struct dirent **namelist[],
		 int (*select)(struct dirent *),
		 int (*compar)(struct dirent **, struct	dirent **));

     int alphasort(struct dirent **d1, struct dirent **d2);

     int scandir64(const char *dirname,	struct dirent64	**namelist[],
		 int (*select)(struct dirent64 *),
		 int (*compar)(struct dirent64 **, struct dirent64 **));

     int alphasort64(struct dirent64 **d1, struct dirent64 **d2);
   BSD:

     #include <sys/types.h>
     #include <sys/dir.h>

     int scandir(const char *dirname, struct direct **namelist[],
		 int (*select)(), int (*compar)());

     int alphasort(struct direct **d1, struct direct **d2);

DESCRIPTION    [Toc]    [Back]

     The inclusion of <dirent.h> selects the System V versions of these
     routines.	For the	4.3BSD versions, include <sys/dir.h>.

     Scandir reads the directory dirname and builds an array of	pointers to
     directory entries using malloc(3C).  It returns the number	of entries in
     the array and a pointer to	the array through 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(3C) to sort the completed array. If this pointer is null,
     the array is not sorted.  alphasort is a routine which can	be used	for
     the compar	parameter to sort the array alphabetically.






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SCANDIR(3C)							   SCANDIR(3C)



     The memory	allocated for the array	can be deallocated with	free (see
     malloc(3C)) by freeing each pointer in the	array and the array itself.

     The scandir64 and alphasort64 interfaces differ from scandir and
     alphasort,	respectively, in that they use dirent64	structures instead of
     dirent structures.

SEE ALSO    [Toc]    [Back]

     directory(3C), malloc(3), qsort(3C), dirent(4)

DIAGNOSTICS    [Toc]    [Back]

     Returns -1	if the directory cannot	be opened for reading or if malloc(3C)
     cannot allocate enough memory to hold all the data	structures.


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