scandir(3C)                  DG/UX 5.4 Rel. 2.01                 scandir(3C)


NAME
       scandir, alphasort - scan a directory

SYNOPSIS
       #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(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.

       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.

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

SEE ALSO
       directory(3C), malloc(3C), qsort(3C), dirent(4).














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