From bb7386472466e55f75df024d18e8da37a222bb41 Mon Sep 17 00:00:00 2001
From: "kay.sievers@vrfy.org" <kay.sievers@vrfy.org>
Date: Mon, 16 Feb 2004 21:39:40 -0800
Subject: [PATCH] [PATCH] allow SYSFS{file}

On Sun, Feb 15, 2004 at 03:36:00AM +0100, Kay Sievers wrote:
>
> Since we have %s{file} it may be nice to allow SYSFS{file}.
> This patch allows:
>
>   BUS="usb", SYSFS{idProduct}="a511", NAME="video%n"
>
> compared to the current:
>
>   BUS="usb", SYSFS_idProduct="a511", NAME="video%n"
>
> The curent syntax is still supported.
> Looks a bit nicer and less hackish, I think.

Better patch with infrastructure to easily implement KEY{attribute}
for every other key. The first user is the SYSFS{file} key.
Both versions, brackets or underscore is supported for the attribute.
---
 namedev.h         |  2 +-
 namedev_parse.c   | 43 +++++++++++++++++++++++++++++++++++++++----
 test/udev-test.pl | 10 ++++++++++
 3 files changed, 50 insertions(+), 5 deletions(-)

diff --git a/namedev.h b/namedev.h
index a0cdba6b..e38c4f52 100644
--- a/namedev.h
+++ b/namedev.h
@@ -36,7 +36,7 @@ struct sysfs_class_device;
 #define PROGRAM_SIZE	100
 
 #define FIELD_BUS	"BUS"
-#define FIELD_SYSFS	"SYSFS_"
+#define FIELD_SYSFS	"SYSFS"
 #define FIELD_ID	"ID"
 #define FIELD_PLACE	"PLACE"
 #define FIELD_PROGRAM	"PROGRAM"
diff --git a/namedev_parse.c b/namedev_parse.c
index e6575fa1..20ff60d6 100644
--- a/namedev_parse.c
+++ b/namedev_parse.c
@@ -85,6 +85,35 @@ void dump_perm_dev_list(void)
 		dump_perm_dev(dev);
 }
 
+/* extract possible KEY{attr} or KEY_attr */
+static char *get_key_attribute(char *str)
+{
+	char *pos;
+	char *attr;
+
+	attr = strchr(str, '_');
+	if (attr != NULL) {
+		attr++;
+		dbg("attribute='%s'", attr);
+		return attr;
+	}
+
+	attr = strchr(str, '{');
+	if (attr != NULL) {
+		attr++;
+		pos = strchr(attr, '}');
+		if (pos == NULL) {
+			dbg("missing closing brace for format");
+			return NULL;
+		}
+		pos[0] = '\0';
+		dbg("attribute='%s'", attr);
+		return attr;
+	}
+
+	return NULL;
+}
+
 int namedev_init_rules(void)
 {
 	char line[255];
@@ -92,6 +121,7 @@ int namedev_init_rules(void)
 	char *temp;
 	char *temp2;
 	char *temp3;
+	char *attr;
 	FILE *fd;
 	int program_given = 0;
 	int retval = 0;
@@ -164,8 +194,12 @@ int namedev_init_rules(void)
 					++pair;
 				}
 				if (pair) {
-					/* remove prepended 'SYSFS_' */
-					strfieldcpy(pair->file, temp2 + sizeof(FIELD_SYSFS)-1);
+					attr = get_key_attribute(temp2 + sizeof(FIELD_SYSFS)-1);
+					if (attr == NULL) {
+						dbg("error parsing " FIELD_SYSFS " attribute");
+						continue;
+					}
+					strfieldcpy(pair->file, attr);
 					strfieldcpy(pair->value, temp3);
 				}
 				continue;
@@ -205,12 +239,13 @@ int namedev_init_rules(void)
 		/* simple plausibility check for given keys */
 		if ((dev.sysfs_pair[0].file[0] == '\0') ^
 		    (dev.sysfs_pair[0].value[0] == '\0')) {
-			dbg("inconsistency in SYSFS_ key");
+			dbg("inconsistency in " FIELD_SYSFS " key");
 			goto error;
 		}
 
 		if ((dev.result[0] != '\0') && (program_given == 0)) {
-			dbg("RESULT is only useful when PROGRAM called in any rule before");
+			dbg(FIELD_RESULT " is only useful when "
+			    FIELD_PROGRAM " is called in any rule before");
 			goto error;
 		}
 
diff --git a/test/udev-test.pl b/test/udev-test.pl
index cbe110f7..abe622cf 100644
--- a/test/udev-test.pl
+++ b/test/udev-test.pl
@@ -191,6 +191,16 @@ EOF
 		expected => "Major:8:minor:3:kernelnumber:3:bus:0:0:0:0" ,
 		conf     => <<EOF
 BUS="scsi", PLACE="0:0:0:0", NAME="Major:%M:minor:%m:kernelnumber:%n:bus:%b"
+EOF
+	},
+	{
+		desc     => "select sysfs attribute by SYSFS{vendor}",
+		subsys   => "block",
+		devpath  => "block/sda",
+		expected => "disk-IBM-ESXS-sda" ,
+		conf     => <<EOF
+BUS="scsi", SYSFS{vendor}="IBM-ESXS", NAME="disk-%s{vendor}-%k"
+KERNEL="ttyUSB0", NAME="visor"
 EOF
 	},
 	{
-- 
2.39.5