Facebook: Fix cutting unicode strings (fixes #711)

2 files changed, 13 insertions, 0 deletions

diff --git a/utils/std_string_utils.cpp b/utils/std_string_utils.cpp
index c1b46a8015..dc763524f3 100644
--- a/utils/std_string_utils.cpp
+++ b/utils/std_string_utils.cpp
@@ -417,6 +417,18 @@ std::string utils::text::rand_string(int len, const char *chars, unsigned int *n
 	return out.str();
 }
 
+std::string utils::text::truncate_utf8(const std::string &text, size_t maxLength) {
+	// To not split some unicode character we need to transform it to wchar_t first, then split it, and then convert it back, because we want std::string as result
+	// TODO: Probably there is much simpler and nicer way
+	std::wstring wtext = ptrW(mir_utf8decodeW(text.c_str()));
+	if (wtext.length() > maxLength) {
+		wtext = wtext.substr(0, maxLength) + L"\x2026"; // unicode ellipsis
+		return std::string(_T2A(wtext.c_str(), CP_UTF8));
+	}
+	// It's not longer, return given string
+	return text;
+}
+
 int utils::number::random(int min, int max, unsigned int *number)
 {
 	if (number != NULL) {
diff --git a/utils/std_string_utils.h b/utils/std_string_utils.h
index a49062a0d1..96ee5ca4d9 100644
--- a/utils/std_string_utils.h
+++ b/utils/std_string_utils.h
@@ -73,6 +73,7 @@ namespace utils
 		std::string source_get_value2(std::string* data, const char *term, const char *endings, bool wholeString = false);

 		std::string source_get_form_data(std::string* data, bool hiddenOnly = false);

 		std::string rand_string(int len, const char *chars = "0123456789" "ABCDEFGHIJKLMNOPQRSTUVWXYZ" "abcdefghijklmnopqrstuvwxyz", unsigned int *number = NULL);

+		std::string truncate_utf8(const std::string &text, size_t maxLength);

 		void explode(std::string str, const std::string &separator, std::vector<std::string>* results);

 		void append_ordinal(unsigned long value, std::string* data);

 		std::wstring prepare_name(const std::wstring &name, bool withSurnameLetter);