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usb: return device strings in UTF-8

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Change the encoding of strings returned by usb_string() from ISO 8859-1
to UTF-8.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Clemens Ladisch 2009-04-24 10:12:18 +02:00 committed by Greg Kroah-Hartman
parent 905c02acbd
commit a853a3d4eb
2 changed files with 18 additions and 24 deletions
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1
drivers/usb/Kconfig
View file

@ -64,6 +64,7 @@ config USB_ARCH_HAS_EHCI
config USB
tristate "Support for Host-side USB"
depends on USB_ARCH_HAS_HCD
select NLS # for UTF-8 strings
---help---
Universal Serial Bus (USB) is a specification for a serial bus
subsystem which offers higher speeds and more features than the

41
drivers/usb/core/message.c
View file

@ -10,6 +10,7 @@
#include <linux/mm.h>
#include <linux/timer.h>
#include <linux/ctype.h>
#include <linux/nls.h>
#include <linux/device.h>
#include <linux/scatterlist.h>
#include <linux/usb/quirks.h>
@ -759,7 +760,7 @@ static int usb_string_sub(struct usb_device *dev, unsigned int langid,
}
/**
* usb_string - returns ISO 8859-1 version of a string descriptor
* usb_string - returns UTF-8 version of a string descriptor
* @dev: the device whose string descriptor is being retrieved
* @index: the number of the descriptor
* @buf: where to put the string
@ -767,17 +768,10 @@ static int usb_string_sub(struct usb_device *dev, unsigned int langid,
* Context: !in_interrupt ()
*
* This converts the UTF-16LE encoded strings returned by devices, from
* usb_get_string_descriptor(), to null-terminated ISO-8859-1 encoded ones
* that are more usable in most kernel contexts. Note that all characters
* in the chosen descriptor that can't be encoded using ISO-8859-1
* are converted to the question mark ("?") character, and this function
* usb_get_string_descriptor(), to null-terminated UTF-8 encoded ones
* that are more usable in most kernel contexts. Note that this function
* chooses strings in the first language supported by the device.
*
* The ASCII (or, redundantly, "US-ASCII") character set is the seven-bit
* subset of ISO 8859-1. ISO-8859-1 is the eight-bit subset of Unicode,
* and is appropriate for use many uses of English and several other
* Western European languages. (But it doesn't include the "Euro" symbol.)
*
* This call is synchronous, and may not be used in an interrupt context.
*
* Returns length of the string (>= 0) or usb_control_msg status (< 0).
@ -786,14 +780,14 @@ int usb_string(struct usb_device *dev, int index, char *buf, size_t size)
{
unsigned char *tbuf;
int err;
unsigned int u, idx;
unsigned int u;
if (dev->state == USB_STATE_SUSPENDED)
return -EHOSTUNREACH;
if (size <= 0 || !buf || !index)
return -EINVAL;
buf[0] = 0;
tbuf = kmalloc(256, GFP_NOIO);
tbuf = kmalloc(256 + 2, GFP_NOIO);
if (!tbuf)
return -ENOMEM;
@ -820,17 +814,13 @@ int usb_string(struct usb_device *dev, int index, char *buf, size_t size)
if (err < 0)
goto errout;
for (u = 2; u < err; u += 2)
le16_to_cpus((u16 *)&tbuf[u]);
tbuf[u] = 0;
tbuf[u + 1] = 0;
size--; /* leave room for trailing NULL char in output buffer */
for (idx = 0, u = 2; u < err; u += 2) {
if (idx >= size)
break;
if (tbuf[u+1]) /* high byte */
buf[idx++] = '?'; /* non ISO-8859-1 character */
else
buf[idx++] = tbuf[u];
}
buf[idx] = 0;
err = idx;
err = utf8_wcstombs(buf, (u16 *)&tbuf[2], size);
buf[err] = 0;
if (tbuf[1] != USB_DT_STRING)
dev_dbg(&dev->dev,
@ -843,6 +833,9 @@ int usb_string(struct usb_device *dev, int index, char *buf, size_t size)
}
EXPORT_SYMBOL_GPL(usb_string);
/* one UTF-8-encoded 16-bit character has at most three bytes */
#define MAX_USB_STRING_SIZE (127 * 3 + 1)
/**
* usb_cache_string - read a string descriptor and cache it for later use
* @udev: the device whose string descriptor is being read
@ -860,9 +853,9 @@ char *usb_cache_string(struct usb_device *udev, int index)
if (index <= 0)
return NULL;
buf = kmalloc(256, GFP_KERNEL);
buf = kmalloc(MAX_USB_STRING_SIZE, GFP_KERNEL);
if (buf) {
len = usb_string(udev, index, buf, 256);
len = usb_string(udev, index, buf, MAX_USB_STRING_SIZE);
if (len > 0) {
smallbuf = kmalloc(++len, GFP_KERNEL);
if (!smallbuf)