diff options
Diffstat (limited to 'src/mnemonics')
| -rw-r--r-- | src/mnemonics/electrum-words.cpp | 8 | ||||
| -rw-r--r-- | src/mnemonics/language_base.h | 22 |
2 files changed, 25 insertions, 5 deletions
diff --git a/src/mnemonics/electrum-words.cpp b/src/mnemonics/electrum-words.cpp index 590320550..9c42c5792 100644 --- a/src/mnemonics/electrum-words.cpp +++ b/src/mnemonics/electrum-words.cpp @@ -99,7 +99,7 @@ namespace { if (has_checksum) { - trimmed_word = it2->substr(0, (*it1)->get_unique_prefix_length()); + trimmed_word = Language::utf8prefix(*it2, (*it1)->get_unique_prefix_length()); // Use the trimmed words and map if (trimmed_word_map.count(trimmed_word) == 0) { @@ -144,7 +144,7 @@ namespace { if (it->length() > unique_prefix_length) { - trimmed_words += it->substr(0, unique_prefix_length); + trimmed_words += Language::utf8prefix(*it, unique_prefix_length); } else { @@ -170,9 +170,9 @@ namespace std::string checksum = seed[create_checksum_index(seed, unique_prefix_length)]; - std::string trimmed_checksum = checksum.length() > unique_prefix_length ? checksum.substr(0, unique_prefix_length) : + std::string trimmed_checksum = checksum.length() > unique_prefix_length ? Language::utf8prefix(checksum, unique_prefix_length) : checksum; - std::string trimmed_last_word = last_word.length() > unique_prefix_length ? last_word.substr(0, unique_prefix_length) : + std::string trimmed_last_word = last_word.length() > unique_prefix_length ? Language::utf8prefix(last_word, unique_prefix_length) : last_word; return trimmed_checksum == trimmed_last_word; } diff --git a/src/mnemonics/language_base.h b/src/mnemonics/language_base.h index 0e7d60a02..4d7cce724 100644 --- a/src/mnemonics/language_base.h +++ b/src/mnemonics/language_base.h @@ -46,6 +46,26 @@ namespace Language
{
/*!
+ * \brief Returns a string made of (at most) the first count characters in s.
+ * Assumes well formedness. No check is made for this.
+ * \param s The string from which to return the first count characters.
+ * \param count How many characters to return.
+ * \return A string consisting of the first count characters in s.
+ */
+ std::string utf8prefix(const std::string &s, size_t count)
+ {
+ std::string prefix = "";
+ const char *ptr = s.c_str();
+ while (count-- && *ptr)
+ {
+ prefix += *ptr++;
+ while (((*ptr) & 0xc0) == 0x80)
+ prefix += *ptr++;
+ }
+ return prefix;
+ }
+
+ /*!
* \class Base
* \brief A base language class which all languages have to inherit from for
* Polymorphism.
@@ -70,7 +90,7 @@ namespace Language (*word_map)[*it] = ii;
if (it->length() > unique_prefix_length)
{
- (*trimmed_word_map)[it->substr(0, unique_prefix_length)] = ii;
+ (*trimmed_word_map)[utf8prefix(*it, unique_prefix_length)] = ii;
}
else
{
|