[PATCH] udevinfo symlink reverse query

Thanks to Olaf Hering <olh@suse.de> for this patch. It's possible now to
feed the -n option of udevinfo with a symlink.

I've also added a 'all' attribute, but no more text, it's all in the
included man page :)

3 files changed, 35 insertions, 6 deletions

diff --git a/udevdb.c b/udevdb.c
index a1f79a7c65..95bc06ce67 100644
--- a/udevdb.c
+++ b/udevdb.c
@@ -27,6 +27,7 @@
 #define _KLIBC_HAS_ARCH_SIG_ATOMIC_T
 #include <stdlib.h>
 #include <stdio.h>
+#include <string.h>
 #include <fcntl.h>
 #include <string.h>
 #include <sys/stat.h>
@@ -178,13 +179,29 @@ static int find_found;
 
 static int find_device_by_name(char *path, struct udevice *dev)
 {
+	int l, i, j;
 	if (strncmp(dev->name, find_name, sizeof(dev->name)) == 0) {
-		memcpy(find_dev, dev, sizeof(*find_dev));
-		strfieldcpy(find_path, path);
+		memcpy(find_dev, dev, sizeof(struct udevice));
+		strnfieldcpy(find_path, path, NAME_SIZE);
 		find_found = 1;
 		/* stop search */
 		return 1;
 	}
+	/* look for matching symlink*/
+	l = strlen(dev->symlink);
+	if (!l)
+		return 0;
+	i = j = 0;
+	do {
+		j = strcspn(&dev->symlink[i], " ");
+		if (j && strncmp(&dev->symlink[i], find_name, j) == 0) {
+			memcpy(find_dev, dev, sizeof(struct udevice));
+			strnfieldcpy(find_path, path, NAME_SIZE);
+			find_found = 1;
+			return 1;
+		}
+		i = i + j + 1;
+	} while (i < l);
 	return 0;
 }
 
diff --git a/udevinfo.8 b/udevinfo.8
index ad16ce6aed..528fa4ad95 100644
--- a/udevinfo.8
+++ b/udevinfo.8
@@ -28,13 +28,13 @@ Query the database for specified value of a created device node.
 .RB Needs " \-p " or " \-n " specified.
 .br
 Valid types are:
-.BR name ", " symlink ", " mode " ," owner " , " group " or " path.
+.BR name ", " symlink ", " mode " ," owner " , " group " , " path " or " all.
 .TP
 .BI \-p " sysfs_path"
 Specify the sysfs path of the device to query.
 .TP
 .BI \-n " name"
-Specify the name of the node for the device to query.
+Specify the name of the node or the symlink for the device to query.
 .TP
 .B \-a
 Print all
diff --git a/udevinfo.c b/udevinfo.c
index defed2ee31..01c2a2a8ae 100644
--- a/udevinfo.c
+++ b/udevinfo.c
@@ -122,7 +122,8 @@ enum query_type {
 	SYMLINK,
 	MODE,
 	OWNER,
-	GROUP
+	GROUP,
+	ALL
 };
 
 static int print_device_chain(const char *path)
@@ -258,6 +259,11 @@ static int process_options(void)
 				break;
 			}
 
+			if (strcmp(optarg, "all") == 0) {
+				query = ALL;
+				break;
+			}
+
 			printf("unknown query type\n");
 			exit(1);
 
@@ -366,6 +372,10 @@ print:
 			strfieldcpy(result, path);
 			break;
 
+		case ALL:
+			print_record(path, &dev);
+			goto exit;
+
 		default:
 			goto exit;
 		}
@@ -406,8 +416,10 @@ help:
 	       "             'owner'   of node\n"
 	       "             'group'   of node\n"
 	       "             'path'    sysfs device path\n"
+	       "             'all'     all values\n"
+	       "\n"
 	       "  -p PATH  sysfs device path used for query or chain\n"
-	       "  -n NAME  node name used for query\n"
+	       "  -n NAME  node/symlink name used for query\n"
 	       "\n"
 	       "  -r       print udev root\n"
 	       "  -a       print all SYSFS_attributes along the device chain\n"