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BSD 2.11 - man page for alphasort (bsd section 3)

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SCANDIR(3)									       SCANDIR(3)

NAME
       scandir, alphasort - scan a directory

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

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

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

DESCRIPTION
       Scandir	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 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(3) 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 alpha-
       betically.

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

SEE ALSO
       directory(3), malloc(3), qsort(3), dir(5)

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

4.2 Berkeley Distribution		September 17, 1985			       SCANDIR(3)


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