From 43b7d485d2ab9e320fd32fc47080cd60c626b530 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Thu, 4 Feb 2016 17:25:04 -0500
Subject: Implement -links.

---
 bfs.h    |  1 +
 eval.c   | 12 ++++++++++++
 parse.c  |  2 ++
 tests.sh | 18 +++++++++++++++++-
 4 files changed, 32 insertions(+), 1 deletion(-)

diff --git a/bfs.h b/bfs.h
index 4b558d8..24aeed8 100644
--- a/bfs.h
+++ b/bfs.h
@@ -154,6 +154,7 @@ bool eval_uid(const struct expr *expr, struct eval_state *state);
 bool eval_empty(const struct expr *expr, struct eval_state *state);
 bool eval_hidden(const struct expr *expr, struct eval_state *state);
 bool eval_inum(const struct expr *expr, struct eval_state *state);
+bool eval_links(const struct expr *expr, struct eval_state *state);
 bool eval_type(const struct expr *expr, struct eval_state *state);
 
 bool eval_name(const struct expr *expr, struct eval_state *state);
diff --git a/eval.c b/eval.c
index a60bd30..543a98a 100644
--- a/eval.c
+++ b/eval.c
@@ -284,6 +284,18 @@ bool eval_inum(const struct expr *expr, struct eval_state *state) {
 	return do_cmp(expr, statbuf->st_ino);
 }
 
+/**
+ * -links test.
+ */
+bool eval_links(const struct expr *expr, struct eval_state *state) {
+	const struct stat *statbuf = fill_statbuf(state);
+	if (!statbuf) {
+		return false;
+	}
+
+	return do_cmp(expr, statbuf->st_nlink);
+}
+
 /**
  * -name test.
  */
diff --git a/parse.c b/parse.c
index 0cceef4..296fca7 100644
--- a/parse.c
+++ b/parse.c
@@ -501,6 +501,8 @@ static struct expr *parse_literal(struct parser_state *state) {
 		return new_action(state, eval_nohidden);
 	} else if (strcmp(arg, "-inum") == 0) {
 		return parse_test_icmp(state, arg, eval_inum);
+	} else if (strcmp(arg, "-links") == 0) {
+		return parse_test_icmp(state, arg, eval_links);
 	} else if (strcmp(arg, "-mindepth") == 0) {
 		return parse_depth(state, arg, &state->cl->mindepth);
 	} else if (strcmp(arg, "-maxdepth") == 0) {
diff --git a/tests.sh b/tests.sh
index a45af5f..ffb110d 100755
--- a/tests.sh
+++ b/tests.sh
@@ -28,6 +28,15 @@ function perms_structure() {
     install -Dm755 /dev/null "$1/rwx"
 }
 
+# Creates a file+directory structure with various symbolic and hard links
+function links_structure() {
+    touchp "$1/a"
+    ln -s a "$1/b"
+    ln "$1/a" "$1/c"
+    mkdir -p "$1/d/e"
+    ln -s ../../d "$1/d/e/f"
+}
+
 # Checks for any (order-independent) differences between bfs and find
 function find_diff() {
     diff -u <(./bfs "$@" | sort) <(find "$@" | sort)
@@ -134,7 +143,14 @@ function test_0019() {
     find_diff "$1" -cnewer "$1/e/f"
 }
 
-for i in {1..19}; do
+function test_0020() {
+    links_structure "$1"
+    find_diff "$1" -links 2 && \
+        find_diff "$1" -links -2 && \
+        find_diff "$1" -links +1
+}
+
+for i in {1..20}; do
     dir="$(mktemp -d "${TMPDIR:-/tmp}"/bfs.XXXXXXXXXX)"
     test="test_$(printf '%04d' $i)"
     "$test" "$dir"
-- 
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