From a54c9309c3291a960fcbcbc9e6407330a9edd044 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Sat, 13 Feb 2016 13:13:51 -0500
Subject: Implement -xtype.

---
 bfs.h    |  1 +
 eval.c   | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 parse.c  | 15 ++++++++++-----
 tests.sh | 18 +++++++++++++++++-
 4 files changed, 76 insertions(+), 6 deletions(-)

diff --git a/bfs.h b/bfs.h
index f4e2d24..36b12e4 100644
--- a/bfs.h
+++ b/bfs.h
@@ -163,6 +163,7 @@ bool eval_inum(const struct expr *expr, struct eval_state *state);
 bool eval_links(const struct expr *expr, struct eval_state *state);
 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_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 7c2f104..5c78d0b 100644
--- a/eval.c
+++ b/eval.c
@@ -370,6 +370,54 @@ bool eval_type(const struct expr *expr, struct eval_state *state) {
 	return state->ftwbuf->typeflag == expr->idata;
 }
 
+/**
+ * -xtype test.
+ */
+bool eval_xtype(const struct expr *expr, struct eval_state *state) {
+	struct BFTW *ftwbuf = state->ftwbuf;
+
+	bool is_root = ftwbuf->depth == 0;
+	bool follow = state->cmdline->flags & (is_root ? BFTW_FOLLOW_ROOT : BFTW_FOLLOW_NONROOT);
+
+	bool is_link = ftwbuf->typeflag == BFTW_LNK;
+	if (follow == is_link) {
+		return eval_type(expr, state);
+	}
+
+	// -xtype does the opposite of everything else
+	int at_flags = follow ? AT_SYMLINK_NOFOLLOW : 0;
+
+	struct stat sb;
+	if (fstatat(ftwbuf->at_fd, ftwbuf->at_path, &sb, at_flags) != 0) {
+		if (!follow && errno == ENOENT) {
+			// Broken symlink
+			return eval_type(expr, state);
+		} else {
+			eval_error(state);
+			return false;
+		}
+	}
+
+	switch (expr->idata) {
+	case BFTW_BLK:
+		return S_ISBLK(sb.st_mode);
+	case BFTW_CHR:
+		return S_ISCHR(sb.st_mode);
+	case BFTW_DIR:
+		return S_ISDIR(sb.st_mode);
+	case BFTW_FIFO:
+		return S_ISFIFO(sb.st_mode);
+	case BFTW_LNK:
+		return S_ISLNK(sb.st_mode);
+	case BFTW_REG:
+		return S_ISREG(sb.st_mode);
+	case BFTW_SOCK:
+		return S_ISSOCK(sb.st_mode);
+	}
+
+	return false;
+}
+
 /**
  * Evaluate a negation.
  */
diff --git a/parse.c b/parse.c
index 6af1094..6272ba0 100644
--- a/parse.c
+++ b/parse.c
@@ -438,12 +438,12 @@ static struct expr *parse_samefile(struct parser_state *state, const char *optio
 }
 
 /**
- * Parse -type [bcdpfls].
+ * Parse -x?type [bcdpfls].
  */
-static struct expr *parse_type(struct parser_state *state) {
+static struct expr *parse_type(struct parser_state *state, const char *option, eval_fn *eval) {
 	const char *arg = state->argv[state->i];
 	if (!arg) {
-		fputs("-type needs a value.\n", stderr);
+		fprintf(stderr, "%s needs a value.\n", option);
 		return NULL;
 	}
 
@@ -480,7 +480,7 @@ static struct expr *parse_type(struct parser_state *state) {
 
 	++state->i;
 
-	return new_test_idata(state, eval_type, typeflag);
+	return new_test_idata(state, eval, typeflag);
 }
 
 /**
@@ -657,7 +657,7 @@ static struct expr *parse_literal(struct parser_state *state) {
 		if (strcmp(arg, "-true") == 0) {
 			return &expr_true;
 		} else if (strcmp(arg, "-type") == 0) {
-			return parse_type(state);
+			return parse_type(state, arg, eval_type);
 		}
 		break;
 
@@ -677,6 +677,11 @@ static struct expr *parse_literal(struct parser_state *state) {
 			return new_test_idata(state, eval_access, W_OK);
 		}
 		break;
+
+	case 'x':
+		if (strcmp(arg, "-xtype") == 0) {
+			return parse_type(state, arg, eval_xtype);
+		}
 	}
 
 	fprintf(stderr, "Unknown argument '%s'.\n", arg);
diff --git a/tests.sh b/tests.sh
index 128c63c..046fddd 100755
--- a/tests.sh
+++ b/tests.sh
@@ -183,7 +183,23 @@ function test_0028() {
     find_diff "$links" -samefile "$links/a"
 }
 
-for i in {1..28}; do
+function test_0029() {
+    find_diff "$links" -xtype l
+}
+
+function test_0030() {
+    find_diff "$links" -xtype f
+}
+
+function test_0031() {
+    find_diff -L "$links" -xtype l 2>/dev/null
+}
+
+function test_0032() {
+    find_diff -L "$links" -xtype f 2>/dev/null
+}
+
+for i in {1..32}; do
     test="test_$(printf '%04d' $i)"
     "$test" "$dir"
     status=$?
-- 
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