Changeset b2906c0 in mainline for uspace/lib/c

Timestamp:

2017-07-11T18:44:04Z (8 years ago)

Author:

Jiri Svoboda <jiri@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

f3504c1

Parents:

9bf4488

Message:

One function to compute the number of code units in a UTF-16 null-terminated string.

Location:

uspace/lib/c

Files:

• generic/str.c (modified) (1 diff)
• include/str.h (modified) (1 diff)

uspace/lib/c/generic/str.c

@@ -995 +995 @@
         dest[idx] = '\0';
         return rc;
+}
+
+/** Get size of UTF-16 string.
+ *
+ * Get the number of words which are used by the UTF-16 string @a ustr
+ * (excluding the NULL-terminator).
+ *
+ * @param ustr UTF-16 string to consider.
+ *
+ * @return Number of words used by the UTF-16 string
+ *
+ */
+size_t utf16_wsize(const uint16_t *ustr)
+{
+        size_t wsize = 0;
+
+        while (*ustr++ != 0)
+                wsize++;
+
+        return wsize;
 }
 

uspace/lib/c/include/str.h

@@ -99 +99 @@
 extern int utf16_to_str(char *dest, size_t size, const uint16_t *src);
 extern int str_to_utf16(uint16_t *dest, size_t dlen, const char *src);
+extern size_t utf16_wsize(const uint16_t *ustr);
 
 extern char *str_chr(const char *str, wchar_t ch);