commit a96fd08d68887e0ab96766f1faf312f560fabbc8
Author: Ahmed Siam <aahs.coder@gmail.com>
Date:   Tue Jul 18 08:56:33 2023 +0300

    Solve the issue appeared when i use several .dat files in the same process.

diff --git a/src/i18n.cpp b/src/i18n.cpp
index 7e7a812..d647744 100644
--- a/src/i18n.cpp
+++ b/src/i18n.cpp
@@ -11,16 +11,13 @@
 #include "i18n.h"
 #include <iostream>
 
+std::unordered_map<std::string, std::unique_ptr<char[]>> I18n::locales_data;
 
-const char* I18n::locales_path = "";
-std::unique_ptr<char[]> I18n::locales_data;
-
-I18n::I18n(const char *locales_path) : resource("", "", status)
+I18n::I18n(const char *locales_path, std::string package_name) : resource("", "", status)
 {
     status = U_ZERO_ERROR;
-    if (I18n::locales_path != locales_path) {
-        I18n::locales_path = locales_path;
-
+    if (locales_data.find(package_name) == locales_data.end()) {
+        
         std::ifstream file;
         file.open(locales_path);
 
@@ -31,11 +28,11 @@ I18n::I18n(const char *locales_path) : resource("", "", status)
 
         std::streamsize file_size = std::filesystem::file_size(std::filesystem::path{locales_path});
 
-        locales_data = std::make_unique<char[]>(file_size);
+        locales_data[package_name] = std::make_unique<char[]>(file_size);
 
-        file.read(locales_data.get(), file_size);
-    
-        udata_setAppData("locales", locales_data.get(), &status);
+        file.read(locales_data[package_name].get(), file_size);
+
+        udata_setAppData(package_name.c_str(), locales_data[package_name].get(), &status);
 
         if (!U_SUCCESS(status)) {
             std::cerr << "Error in loading data!" << std::endl;
@@ -43,8 +40,8 @@ I18n::I18n(const char *locales_path) : resource("", "", status)
             exit(EXIT_FAILURE);
         }
     }
-
-    resource = icu::ResourceBundle("locales", icu::Locale().getName(), status);
+    
+    resource = icu::ResourceBundle(package_name.c_str(), icu::Locale().getName(), status);
 
     if (!U_SUCCESS(status)) {
         std::cerr << "Error in initializing resource bundle" << std::endl;
diff --git a/src/i18n.h b/src/i18n.h
index 32e223f..cf9b816 100644
--- a/src/i18n.h
+++ b/src/i18n.h
@@ -5,16 +5,16 @@
 #include <unicode/msgfmt.h>
 #include <vector>
 #include <memory>
+#include <unordered_map>
 
 class I18n
 {
 private:
-    static const char *locales_path;
+    static std::unordered_map<std::string, std::unique_ptr<char[]>> locales_data;
     icu::ResourceBundle resource;
-    static std::unique_ptr<char[]> locales_data;
     UErrorCode status;
 public:
-    I18n(const char *locales_path);
+    I18n(const char *locales_path, std::string package_name);
     icu::UnicodeString format(const char* key, const std::vector<icu::Formattable> args = {});
     icu::UnicodeString format(const char* key, const std::vector<icu::UnicodeString> arg_names,
                                                const std::vector<icu::Formattable> arg_values);
diff --git a/src/icuformat.cpp b/src/icuformat.cpp
index 8fa2584..6f65d2f 100644
--- a/src/icuformat.cpp
+++ b/src/icuformat.cpp
@@ -4,19 +4,19 @@
 
 int main(int argc, char* argv[])
 {
-    if (argc < 3 || argc % 2 == 0) {
-        std::cout << "USAGE: icuformat <data-path> <key> <arg-names> <arg-values>\n";
+    if (argc < 4 || argc % 2 != 0) {
+        std::cout << "USAGE: icuformat <data-path> <package-name> <key> <arg-names> <arg-values>\n";
         return 0;
     }
 
-    I18n i18n {argv[1]};
+    I18n i18n {argv[1], argv[2]};
     
     std::vector<icu::UnicodeString> arg_names;
     std::vector<icu::Formattable> arg_values;
-    if (argc > 3) {
-        int arg_values_start = (argc - 3) / 2 + 3;
+    if (argc > 4) {
+        int arg_values_start = (argc - 4) / 2 + 4;
 
-        for (int i = 3; i < arg_values_start; i++) {
+        for (int i = 4; i < arg_values_start; i++) {
             arg_names.push_back(argv[i]);
         }
         
@@ -24,6 +24,6 @@ int main(int argc, char* argv[])
             arg_values.push_back(argv[i]);
         }
     }
-    std::cout << i18n.format(argv[2], arg_names, arg_values) << std::endl;
+    std::cout << i18n.format(argv[3], arg_names, arg_values) << std::endl;
     return 0;
 }
diff --git a/tests/test.sh b/tests/test.sh
index 3cd0668..f8ef03b 100644
--- a/tests/test.sh
+++ b/tests/test.sh
@@ -8,5 +8,5 @@ pkgdata -p locales --mode archive -d . package_list.txt
 
 icuformat="./../../src/icuformat"
 
-$icuformat locales.dat simple_message
-$icuformat locales.dat complex_message name age Ahmed 15
+$icuformat locales.dat locales simple_message
+$icuformat locales.dat locales complex_message name age Ahmed 15