From 585a9dafe86b51a2d120d107bb04a77b34cc1af0 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Sun, 14 Feb 2016 13:35:23 -0500
Subject: Implement -lname and -ilname.

---
 bfs.h    |  1 +
 eval.c   | 36 ++++++++++++++++++++++++++++++++++++
 parse.c  | 14 +++++++++++++-
 tests.sh | 18 +++++++++++++++++-
 4 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/bfs.h b/bfs.h
index 1b3457a..8e879f5 100644
--- a/bfs.h
+++ b/bfs.h
@@ -168,6 +168,7 @@ bool eval_samefile(const struct expr *expr, struct eval_state *state);
 bool eval_type(const struct expr *expr, struct eval_state *state);
 bool eval_xtype(const struct expr *expr, struct eval_state *state);
 
+bool eval_lname(const struct expr *expr, struct eval_state *state);
 bool eval_name(const struct expr *expr, struct eval_state *state);
 bool eval_path(const struct expr *expr, struct eval_state *state);
 
diff --git a/eval.c b/eval.c
index 63c1348..26596f0 100644
--- a/eval.c
+++ b/eval.c
@@ -307,6 +307,42 @@ bool eval_links(const struct expr *expr, struct eval_state *state) {
 	return do_cmp(expr, statbuf->st_nlink);
 }
 
+/**
+ * -i?lname test.
+ */
+bool eval_lname(const struct expr *expr, struct eval_state *state) {
+	struct BFTW *ftwbuf = state->ftwbuf;
+	if (ftwbuf->typeflag != BFTW_LNK) {
+		return false;
+	}
+
+	const struct stat *statbuf = fill_statbuf(state);
+	if (!statbuf) {
+		return false;
+	}
+
+	size_t size = statbuf->st_size + 1;
+	char *name = malloc(size);
+	if (!name) {
+		eval_error(state);
+		return false;
+	}
+
+	ssize_t ret = readlinkat(ftwbuf->at_fd, ftwbuf->at_path, name, size);
+	if (ret < 0) {
+		eval_error(state);
+		return false;
+	} else if (ret >= size) {
+		return false;
+	}
+
+	name[ret] = '\0';
+
+	bool match = fnmatch(expr->sdata, name, expr->idata) == 0;
+	free(name);
+	return match;
+}
+
 /**
  * -i?name test.
  */
diff --git a/parse.c b/parse.c
index 7cdc685..7951589 100644
--- a/parse.c
+++ b/parse.c
@@ -456,6 +456,14 @@ static struct expr *parse_path(struct parser_state *state, const char *option, b
 	return set_fnm_casefold(expr, casefold);
 }
 
+/**
+ * Parse -i?lname.
+ */
+static struct expr *parse_lname(struct parser_state *state, const char *option, bool casefold) {
+	struct expr *expr = parse_test_sdata(state, option, eval_lname);
+	return set_fnm_casefold(expr, casefold);
+}
+
 /**
  * Parse -noleaf.
  */
@@ -670,7 +678,9 @@ static struct expr *parse_literal(struct parser_state *state) {
 		break;
 
 	case 'i':
-		if (strcmp(arg, "-iname") == 0) {
+		if (strcmp(arg, "-ilname") == 0) {
+			return parse_lname(state, arg, true);
+		} if (strcmp(arg, "-iname") == 0) {
 			return parse_name(state, arg, true);
 		} else if (strcmp(arg, "-inum") == 0) {
 			return parse_test_icmp(state, arg, eval_inum);
@@ -682,6 +692,8 @@ static struct expr *parse_literal(struct parser_state *state) {
 	case 'l':
 		if (strcmp(arg, "-links") == 0) {
 			return parse_test_icmp(state, arg, eval_links);
+		} else if (strcmp(arg, "-lname") == 0) {
+			return parse_lname(state, arg, false);
 		}
 		break;
 
diff --git a/tests.sh b/tests.sh
index cbfefcb..e6b52be 100755
--- a/tests.sh
+++ b/tests.sh
@@ -223,7 +223,23 @@ function test_0038() {
     find_diff "$basic" -ipath "$basic/*F*"
 }
 
-for i in {1..38}; do
+function test_0039() {
+    find_diff "$links" -lname '[aq]'
+}
+
+function test_0040() {
+    find_diff "$links" -ilname '[AQ]'
+}
+
+function test_0041() {
+    find_diff -L "$links" -lname '[aq]' 2>/dev/null
+}
+
+function test_0042() {
+    find_diff -L "$links" -lname '[AQ]' 2>/dev/null
+}
+
+for i in {1..42}; do
     test="test_$(printf '%04d' $i)"
     "$test" "$dir"
     status=$?
-- 
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