MAINT-6446 Correct password length handling

2 files changed, 38 insertions, 0 deletions

diff --git a/indra/llcommon/llstring.cpp b/indra/llcommon/llstring.cpp
index f3b8999883..c45db3b185 100644
--- a/indra/llcommon/llstring.cpp
+++ b/indra/llcommon/llstring.cpp
@@ -576,6 +576,33 @@ std::string utf8str_truncate(const std::string& utf8str, const S32 max_len)
 	}
 }
 
+std::string utf8str_symbol_truncate(const std::string& utf8str, const S32 symbol_len)
+{
+    if (0 == symbol_len)
+    {
+        return std::string();
+    }
+    if ((S32)utf8str.length() <= symbol_len)
+    {
+        return utf8str;
+    }
+    else
+    {
+        int len = 0, byteIndex = 0;
+        const char* aStr = utf8str.c_str();
+        size_t origSize = utf8str.size();
+
+        for (byteIndex = 0; len < symbol_len && byteIndex < origSize; byteIndex++)
+        {
+            if ((aStr[byteIndex] & 0xc0) != 0x80)
+            {
+                len += 1;
+            }
+        }
+        return utf8str.substr(0, byteIndex);
+    }
+}
+
 std::string utf8str_substChar(
 	const std::string& utf8str,
 	const llwchar target_char,
diff --git a/indra/llcommon/llstring.h b/indra/llcommon/llstring.h
index 393f6d7a8c..a40db0f8cc 100644
--- a/indra/llcommon/llstring.h
+++ b/indra/llcommon/llstring.h
@@ -564,6 +564,17 @@ LL_COMMON_API S32 utf8str_compare_insensitive(
 	const std::string& rhs);
 
 /**
+* @brief Properly truncate a utf8 string to a maximum character count.
+*
+* If symbol_len is longer than the string passed in, the return
+* value == utf8str.
+* @param utf8str A valid utf8 string to truncate.
+* @param symbol_len The maximum number of symbols in the return value.
+* @return Returns a valid utf8 string with symbol count <= max_len.
+*/
+LL_COMMON_API std::string utf8str_symbol_truncate(const std::string& utf8str, const S32 symbol_len);
+
+/**
  * @brief Replace all occurences of target_char with replace_char
  *
  * @param utf8str A utf8 string to process.