SCANDIR(3)SCANDIR(3)NAME
scandir, alphasort - scan a directory
SYNOPSIS
#include <sys/types.h>
#include <dirent.h>
scandir(dirname, namelist, select, compar)
char *dirname;
struct direct ***namelist;
int (*select)();
int (*compar)();
alphasort(d1, d2)
void *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. 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.
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(3), by
freeing each pointer in the array and then the array itself.
SEE ALSOdirectory(3), malloc(3), qsort(3), dir(5)DIAGNOSTICS
Returns -1 if the directory cannot be opened for reading or if mal‐
loc(3) cannot allocate enough memory to hold all the data structures.
4.2 Berkeley Distribution June 24, 1990 SCANDIR(3)
