From 55aa4090d742d0c6357a7c53f32e1fd778e76276 Mon Sep 17 00:00:00 2001
From: Andre Noll <maan@systemlinux.org>
Date: Fri, 28 Sep 2007 19:55:17 +0200
Subject: [PATCH] Implement pattern matching for com_lsatt().

---
 afs.cmd     |  6 ++--
 attribute.c | 98 +++++++++++++++++++++++++++++++----------------------
 2 files changed, 62 insertions(+), 42 deletions(-)

diff --git a/afs.cmd b/afs.cmd
index f27fa4a8..fb691ab6 100644
--- a/afs.cmd
+++ b/afs.cmd
@@ -82,7 +82,7 @@ H: 		-sa:  sort by audio format.
 N: lsatt
 P: AFS_READ
 D: List attributes
-U: lsatt [-a] [-l]
+U: lsatt [-a] [-l] [-r]
 H:
 H: Print the list of all defined attributes.
 H:
@@ -93,6 +93,8 @@ H: 	identifier.
 H:
 H: -l	Print a long listing containing both identifier and attribute name. The
 H: 	default is to print only the name.
+H:
+H: -l	Reverse sort order.
 ---
 N: setatt
 P: AFS_READ | AFS_WRITE
@@ -109,7 +111,7 @@ H: attribute of all files ending with 'foo.mp3'.
 N: addatt
 P: AFS_READ | AFS_WRITE
 D: Add new attribute(s).
-U: addatt attribute1 [attribute2 ...]
+U: addatt attribute1...
 H: This adds new attributes to the attribute table. At most 64 attributes
 H: may be defined.
 ---
diff --git a/attribute.c b/attribute.c
index 560e7582..c8c6b07f 100644
--- a/attribute.c
+++ b/attribute.c
@@ -99,63 +99,79 @@ int get_attribute_bitnum_by_name(const char *att_name, unsigned char *bitnum)
 	return 1;
 }
 
-/** Whether "-a" was given for the lsatt command. */
-#define LSATT_FLAG_ALPHA 1
-/** Whether "-l" was given for the lsatt command. */
-#define LSATT_FLAG_LONG 2
+enum lsatt_flags {
+	/** Whether "-a" was given for the lsatt command. */
+	LSATT_FLAG_ALPHA = 1,
+	/** Whether "-l" was given for the lsatt command. */
+	LSATT_FLAG_LONG = 2,
+	LSATT_FLAG_REVERSE = 4
+};
 
-/** Data passed via osl_rbtree_loop(). */
-struct private_lsatt_data {
+/** Data passed to the action function of lsatt */
+struct lsatt_action_data {
+	/** The result buffer. */
+	struct para_buffer pb;
 	/** The given flags for the lsatt command. */
 	unsigned flags;
-	/** The result buffer. */
-	struct para_buffer b;
 };
 
-static int print_attribute(struct osl_row *row, void *private_data)
+static int print_attribute(struct osl_table *table, struct osl_row *row,
+		const char *name, void *data)
 {
-	struct private_lsatt_data *pld = private_data;
+	struct lsatt_action_data *laad = data;
+	struct osl_object bitnum_obj;
 	int ret;
-	struct osl_object name_obj, bitnum_obj;
 
-	ret = osl_get_object(attribute_table, row, ATTCOL_NAME, &name_obj);
-	if (ret < 0)
-		return ret;
-	if (!(pld->flags & LSATT_FLAG_LONG)) {
-		para_printf(&pld->b, "%s\n", (char *)name_obj.data);
+	if (!(laad->flags & LSATT_FLAG_LONG)) {
+		para_printf(&laad->pb, "%s\n", name);
 		return 1;
 	}
-	ret = osl_get_object(attribute_table, row, ATTCOL_BITNUM, &bitnum_obj);
-	if (ret < 0)
-		return ret;
-	para_printf(&pld->b, "%u\t%s\n", *(unsigned char*)bitnum_obj.data,
-		(char *)name_obj.data);
+	ret = osl_get_object(table, row, ATTCOL_BITNUM, &bitnum_obj);
+	if (ret < 0) {
+		para_printf(&laad->pb, "%s: %s\n", name, PARA_STRERROR(-ret));
+		return 1;
+	}
+	para_printf(&laad->pb, "%u\t%s\n", *(unsigned char*)bitnum_obj.data,
+		name);
 	return 1;
 }
 
 static int com_lsatt_callback(const struct osl_object *query,
 		struct osl_object *result)
 {
-	struct private_lsatt_data pld = {.flags = *(uint32_t *) query->data};
+	struct lsatt_action_data laad = {.flags = *(unsigned *) query->data};
 	int ret;
+	struct pattern_match_data pmd = {
+		.table = attribute_table,
+		.loop_col_num = ATTCOL_BITNUM,
+		.match_col_num = ATTCOL_NAME,
+		.patterns = {.data = (char *)query->data + sizeof(laad.flags),
+			.size = query->size - sizeof(laad.flags)},
+		.pm_flags = PM_NO_PATTERN_MATCHES_EVERYTHING,
+		.data = &laad,
+		.action = print_attribute
+	};
 
-	if (pld.flags & LSATT_FLAG_ALPHA)
-		ret = osl_rbtree_loop(attribute_table, ATTCOL_NAME,
-			&pld, print_attribute);
-	else
-		ret = osl_rbtree_loop(attribute_table, ATTCOL_BITNUM,
-			&pld, print_attribute);
-	result->data = pld.b.buf;
-	result->size = pld.b.size;
-	return ret;
+	if (laad.flags & LSATT_FLAG_ALPHA)
+		pmd.loop_col_num = ATTCOL_NAME;
+	if (laad.flags & LSATT_FLAG_REVERSE)
+		pmd.pm_flags |= PM_REVERSE_LOOP;
+	ret = for_each_matching_row(&pmd);
+	if (ret < 0)
+		para_printf(&laad.pb, "%s\n", PARA_STRERROR(-ret));
+	if (!laad.pb.buf)
+		para_printf(&laad.pb, "no match\n");
+	result->data = laad.pb.buf;
+	result->size = laad.pb.size;
+	return 1;
 }
 
-
 int com_lsatt(int fd, int argc, char * const * const argv)
 {
+	unsigned flags = 0;
+	struct osl_object options = {.data = &flags, .size = sizeof(flags)},
+		result;
 	int ret, i;
-	uint32_t flags = 0;
-	struct osl_object query, result;
 
 	for (i = 1; i < argc; i++) {
 		const char *arg = argv[i];
@@ -173,16 +189,18 @@ int com_lsatt(int fd, int argc, char * const * const argv)
 			flags |= LSATT_FLAG_LONG;
 			continue;
 		}
+		if (!strcmp(arg, "-r")) {
+			flags |= LSATT_FLAG_REVERSE;
+			continue;
+		}
 	}
-	if (argc > i)
-		return -E_ATTR_SYNTAX;
-	query.data = &flags;
-	query.size = sizeof(flags);
-	ret = send_callback_request(com_lsatt_callback, &query, &result);
+	ret = send_option_arg_callback_request(&options, argc -i, argv + i,
+		com_lsatt_callback, &result);
 	if (ret > 0) {
 		ret = send_buffer(fd, (char *)result.data);
 		free(result.data);
-	}
+	} else
+		send_va_buffer(fd, "%s\n", PARA_STRERROR(-ret));
 	return ret;
 }
 
-- 
2.39.2