Set C locale, treat EPUB file names as UTF-8.

EPUB file names MUST be UTF-8. ASCII is a subset of UTF-8.

src/main.cpp

@@ -22,6 +22,7 @@
 #include <boost/program_options/errors.hpp>
 #include <boost/program_options/variables_map.hpp>
 
+#include <clocale>
 #include <cstdlib>
 #include <exception>
 #include <iostream>
@@ -37,6 +38,9 @@ int main(int argc, char *argv[])
     using std::cerr;
     using std::cout;
 
+    // locale_generator("").name.c_str() returns "*" instead of "". That's why
+    // the global C locale isn't changed. So we have to set it additionally.
+    std::setlocale(LC_ALL, "");
     boost::locale::generator locale_generator;
     locale_generator.add_messages_path("translations");
     locale_generator.add_messages_path("/usr/share/locale");

src/zip.cpp

@@ -50,7 +50,7 @@ std::vector<std::string> list(const fs::path &filepath)
     std::vector<std::string> toc;
     while (archive_read_next_header(zipfile, &entry) == ARCHIVE_OK)
     {
-        toc.emplace_back(archive_entry_pathname(entry));
+        toc.emplace_back(archive_entry_pathname_utf8(entry));
         archive_read_data_skip(zipfile);
     }
 

tests/test_zip_list.cpp

@@ -3,12 +3,14 @@
 
 #include <catch.hpp>
 
+#include <clocale>
 #include <exception>
 #include <string>
 #include <vector>
 
 SCENARIO("epubgrep::zip::list() doesn't fail and returns the right file list")
 {
+    std::setlocale(LC_CTYPE, ""); // Needed for utf-8 support in libarchive.
     bool exception{false};
     std::vector<std::string> filelist;