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>
---
include/linux/string.h | 1 +
lib/string.c | 26 ++++++++++++++++++++++++++
2 files changed, 27 insertions(+)
diff --git a/include/linux/string.h b/include/linux/string.h
index 26b6f6a..48fd0c6 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -135,6 +135,7 @@ static inline int strtobool(const char *s, bool *res)
}
int match_string(const char * const *array, size_t n, const char *string);
+unsigned int ascii2utf16le(char const *s, u8 *buf, unsigned int len);
#ifdef CONFIG_BINARY_PRINTF
int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args);
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;
+ }
+ return len;
+}
+EXPORT_SYMBOL(ascii2utf16le);
--
2.1.4
--
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