Give find(1) the option -acl to locate files with extended

ACLs.  This is similar to what ls(1) can do.  It is handy to
have it so that it can be used in conjunction with
"-exec setfacl {} \;" (to find(1)), among others.

This is the submitter's patch, but slightly modified.

PR: bin/65016
Submitted by: Christian S.J. Peron <maneo@bsdpro.com>

usr.bin/find/extern.h

@@ -52,6 +52,7 @@ OPTION	*lookup_option(const char *);
 
 creat_f	c_Xmin;
 creat_f	c_Xtime;
+creat_f	c_acl;
 creat_f	c_and;
 creat_f	c_delete;
 creat_f	c_depth;
@@ -82,6 +83,7 @@ creat_f	c_xdev;
 
 exec_f	f_Xmin;
 exec_f	f_Xtime;
+exec_f	f_acl;
 exec_f	f_always_true;
 exec_f	f_closeparen;
 exec_f	f_delete;

usr.bin/find/function.c

@@ -46,6 +46,8 @@ __FBSDID("$FreeBSD$");
 #include <sys/param.h>
 #include <sys/ucred.h>
 #include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/acl.h>
 #include <sys/wait.h>
 #include <sys/mount.h>
 #include <sys/timeb.h>
@@ -351,6 +353,55 @@ c_mXXdepth(OPTION *option, char ***argvp)
 	return new;
 }
 
+/*
+ * -acl function --
+ *
+ *	Show files with EXTENDED ACL attributes.
+ */
+int
+f_acl(PLAN *plan__unused, FTSENT *entry)
+{
+	int match, entries;
+	acl_entry_t ae;
+	acl_t facl;
+
+	if (S_ISLNK(entry->fts_statp->st_mode))
+		return 0;
+	if ((match = pathconf(entry->fts_accpath, _PC_ACL_EXTENDED)) <= 0) {
+		if (match < 0 && errno != EINVAL)
+			warn("%s", entry->fts_accpath);
+	else
+		return 0;
+	}
+	match = 0;
+	if ((facl = acl_get_file(entry->fts_accpath,ACL_TYPE_ACCESS)) != NULL) {
+		if (acl_get_entry(facl, ACL_FIRST_ENTRY, &ae) == 1) {
+			/*
+			 * POSIX.1e requires that ACLs of type ACL_TYPE_ACCESS
+			 * must have at least three entries (owner, group,
+			 * other).
+			 */
+			entries = 1;
+			while (acl_get_entry(facl, ACL_NEXT_ENTRY, &ae) == 1) {
+				if (++entries > 3) {
+					match = 1;
+					break;
+				}
+			}
+		}
+		acl_free(facl);
+	} else
+		warn("%s", entry->fts_accpath);
+	return match;
+}
+
+PLAN *
+c_acl(OPTION *option, char ***argvp__unused)
+{
+	ftsoptions &= ~FTS_NOSTAT;
+	return (palloc(option));
+}
+
 /*
  * -delete functions --
  *

usr.bin/find/option.c

@@ -63,6 +63,7 @@ static OPTION const options[] = {
 	{ "(",		c_simple,	f_openparen,	0 },
 	{ ")",		c_simple,	f_closeparen,	0 },
 	{ "-a",		c_and,		NULL,		0 },
+	{ "-acl",	c_acl,		f_acl,		0 },
 	{ "-amin",	c_Xmin,		f_Xmin,		F_TIME_A },
 	{ "-and",	c_and,		NULL,		0 },
 	{ "-anewer",	c_newer,	f_newer,	F_TIME_A },