Re: udevinfo reverse lookup for symlinks

[Olaf Hering <olh@suse.de>]

 On Mon, Feb 09, Kay Sievers wrote:

> On Mon, Feb 09, 2004 at 05:33:32PM +0100, Olaf Hering wrote:
> > 
> > How do I reverse lookup symlinks?
> > It seem that is not implemented.
> > 
> > nectarine:~ # udevinfo -n cdrom -q path
> > device not found in database
> 
> It's not implemented. I didn't see the need for this,
> cause it's easy to follow the link to the real node
> and query this instead. But feel free to send a patch :)


diff -purN udev-klibc/udevdb.c udev-klibc-debug/udevdb.c
--- udev-klibc/udevdb.c	2004-02-28 02:11:47.000000000 +0100
+++ udev-klibc-debug/udevdb.c	2004-02-29 20:38:39.668973696 +0100
@@ -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)
 {
+	char sp[] = " ";
+	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);
+		strncpy(find_path, path, NAME_SIZE);
 		find_found = 1;
 		/* stop search */
 		return 1;
 	}
+	l = strlen(dev->symlink);
+	if (!l)
+		return 0;
+	i = j = 0;
+	do {
+		j = strcspn(&dev->symlink[i], sp);
+		if (j && strncmp(&dev->symlink[i], find_name, j -i) = 0) {
+			memcpy(find_dev, dev, sizeof(*find_dev));
+			strncpy(find_path, path, NAME_SIZE);
+			find_found = 1;
+			return 1;
+		}
+		i = i + j + 1;
+	} while (i < l);
 	return 0;
 }
 

-- 
USB is for mice, FireWire is for men!

sUse lINUX ag, nÃœRNBERG


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