scandir, alphasort - scan a directory
scandir(const char *dirname, struct dirent ***namelist,
int (*select)(struct dirent *),
int (*compar)(const void *, const void *));
alphasort(const void *d1, const void *d2);
The 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
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
should return a non-zero value if the directory entry is to
in the array. If select is NULL, then all 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
parameter to sort the array alphabetically.
The memory allocated for the array can be deallocated with
freeing each pointer in the array and then the array itself.
Returns -1 if the directory cannot be opened for reading or
cannot allocate enough memory to hold all the data structures.
directory(3), malloc(3), qsort(3), dir(5)
The scandir() and alphasort() functions appeared in 4.2BSD.
OpenBSD 3.6 June 4, 1993
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