Add the -empty flag, from OpenBSD. It returns true if the directory

is empty.  There doesn't appear to be another easy way to do this.

mobile# mkdir foo
mobile# mkdir foo/bar
mobile# mkdir bar
mobile# find . -empty
./foo/bar
./bar

1 files changed, 43 insertions, 0 deletions

diff --git a/usr.bin/find/function.c b/usr.bin/find/function.c
index 670d102..18cd83c 100644
--- a/usr.bin/find/function.c
+++ b/usr.bin/find/function.c
@@ -49,6 +49,7 @@ static const char rcsid[] =
 #include <sys/wait.h>
 #include <sys/mount.h>
 
+#include <dirent.h>
 #include <err.h>
 #include <errno.h>
 #include <fnmatch.h>
@@ -385,6 +386,48 @@ c_exec(argvp, isok)
 }
  
 /*
+ * -empty functions --
+ *
+ *	True if the file or directory is empty
+ */
+int
+f_empty(plan, entry)
+	PLAN *plan;
+	FTSENT *entry;
+{
+	if (S_ISREG(entry->fts_statp->st_mode) && entry->fts_statp->st_size == 0)
+		return (1);
+	if (S_ISDIR(entry->fts_statp->st_mode)) {
+		struct dirent *dp;
+		int empty;
+		DIR *dir;
+
+		empty = 1;
+		dir = opendir(entry->fts_accpath);
+		if (dir == NULL)
+			err(1, "%s", entry->fts_accpath);
+		for (dp = readdir(dir); dp; dp = readdir(dir))
+			if (dp->d_name[0] != '.' ||
+			    (dp->d_name[1] != '\0' &&
+			     (dp->d_name[1] != '.' || dp->d_name[2] != '\0'))) {
+				empty = 0;
+				break;
+			}
+		closedir(dir);
+		return (empty);
+	}
+	return (0);
+}
+
+PLAN *
+c_empty()
+{
+	ftsoptions &= ~FTS_NOSTAT;
+
+	return (palloc(N_EMPTY, f_empty));
+}
+
+/*
  * -execdir utility [arg ... ] ; functions --
  *
  *	True if the executed utility returns a zero value as exit status.