Re: [PATCH v3 1/3] lib/string: introduce ascii2utf16le() helper

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




Hello!

On 02/06/2017 05:03 PM, Richard Leitner wrote:

For USB string descriptors we need to convert ASCII strings to UTF16-LE.
Therefore make a simple helper function (based on ascii2desc from
drivers/usb/core/hcd.c) for that purpose.

Signed-off-by: Richard Leitner <richard.leitner@xxxxxxxxxxx>
[...]
diff --git a/lib/string.c b/lib/string.c
index ed83562..a113e3e 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -952,3 +952,29 @@ char *strreplace(char *s, char old, char new)
 	return s;
 }
 EXPORT_SYMBOL(strreplace);
+
+/**
+ * ascii2utf16le() - Helper routine for producing UTF-16LE string descriptors
+ * @s: Null-terminated ASCII (actually ISO-8859-1) string
+ * @buf: Buffer for UTF-16LE string
+ * @len: Length (in bytes; may be odd) of UTF-16LE buffer.
+ *
+ * Return: The number of bytes filled in: 2*strlen(s) or @len, whichever is less
+ */
+unsigned int ascii2utf16le(char const *s, u8 *buf, unsigned int len)
+{
+	unsigned int n, t = 2 * strlen(s);
+
+	if (len > t)
+		len = t;
+	n = len;
+	while (n--) {
+		t = (unsigned char)*s++;
+		*buf++ = t;
+		if (!n--)
+			break;
+		*buf++ = t >> 8;

   Isn't it always 0?

+	}
+	return len;
+}
+EXPORT_SYMBOL(ascii2utf16le);

MBR, Sergei

--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]
  Powered by Linux