string_util: Implement buffer to UTF-16 string helper function

Needed as most all software keyboard functions use fixed-length UTF16 string buffers.

2 files changed, 17 insertions, 0 deletions

diff --git a/src/common/string_util.cpp b/src/common/string_util.cpp
index 14f7037d8..a1360dd26 100644
--- a/src/common/string_util.cpp
+++ b/src/common/string_util.cpp
@@ -214,6 +214,15 @@ std::string StringFromFixedZeroTerminatedBuffer(const char* buffer, std::size_t
     return std::string(buffer, len);
 }
 
+std::u16string UTF16StringFromFixedZeroTerminatedBuffer(const char16_t* buffer,
+                                                        std::size_t max_len) {
+    std::size_t len = 0;
+    while (len < max_len && buffer[len] != '\0')
+        ++len;
+
+    return std::u16string(buffer, len);
+}
+
 const char* TrimSourcePath(const char* path, const char* root) {
     const char* p = path;
 
diff --git a/src/common/string_util.h b/src/common/string_util.h
index 08f96533b..95b7badaf 100644
--- a/src/common/string_util.h
+++ b/src/common/string_util.h
@@ -67,6 +67,14 @@ bool ComparePartialString(InIt begin, InIt end, const char* other) {
 std::string StringFromFixedZeroTerminatedBuffer(const char* buffer, std::size_t max_len);
 
 /**
+ * Creates a UTF-16 std::u16string from a fixed-size NUL-terminated char buffer. If the buffer isn't
+ * NUL-terminated, then the string ends at the greatest multiple of two less then or equal to
+ * max_len_bytes.
+ */
+std::u16string UTF16StringFromFixedZeroTerminatedBuffer(const char16_t* buffer,
+                                                        std::size_t max_len);
+
+/**
  * Attempts to trim an arbitrary prefix from `path`, leaving only the part starting at `root`. It's
  * intended to be used to strip a system-specific build directory from the `__FILE__` macro,
  * leaving only the path relative to the sources root.