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Simple C++ gettext-like toolkit

By admin | December 20, 2009

Here is a small gettext-compatible interface for reading simple translation catalogs (not to be confused with gettext’s *.mo style catalogs, which are binary) in form of “original/english string<tab>translated string”. It is not fool-proof, but you can play around with it and it works.

/*
 *      gettextpd.h
 * 		Main file for GettextPD
 *
 *      © Copyright 2009 Compdigitec. All rights reserved.
 *
 *      Copying and distribution of this file, with or without modification,
 * 		are permitted in any medium without royalty provided the copyright
 * 		notice and this notice are preserved.  This file is offered as-is,
 * 		without any warranty.
 */
#ifndef __GETTEXTPD__
#define __GETTEXTPD__

#include <stdlib.h>
#include <cstring>
#include <string>
#include <iostream>
#include <fstream>

// gettext functions
char* gettext (char *msgid);
std::string gettext (std::string msgid);
char* textdomain (const char *domain_name);
char* bindtextdomain (const char *domain_name, const char *dir_name);
char* setlocale (int category, const char* locale);

// macros
#define _(str) gettext(str)

// globals
std::string gtpd_locale = "";
std::string gtpd_domain = "";
std::string gtpd_location = "";

// function bodies
char* gettext(char* msgid)
{
	std::string x(msgid);
	std::string result;
	result = gettext(x);
	char* nb = (char*)malloc(sizeof(char)*result.length());
	strcpy(nb,result.c_str());
	return nb;
}

std::string gettext(std::string msgid)
{
	std::string path = gtpd_location + "/" + gtpd_locale + "/LC_MESSAGES/" + gtpd_domain + ".mo";
	std::ifstream stream;
	stream.open(path.c_str());
	std::string resultline;
	while(!stream.eof()) {
		getline(stream,resultline);
		if(strstr(resultline.c_str(),msgid.c_str()) != NULL) {
			break;
		}
		resultline = "";
	}
	if(resultline == "") {
		// not found
		return msgid;
	}
	int splitloc = resultline.find("\t");
	return resultline.substr(splitloc+1);
}

char* textdomain(const char *domain_name)
{
	gtpd_domain = domain_name;
	char* res = (char*)malloc(sizeof(char)*100);
	strcpy(res,domain_name);
	return res;
}

char* bindtextdomain (const char *domain_name, const char *dir_name)
{
	gtpd_location = dir_name;
	textdomain(domain_name);
	char* res = (char*)malloc(sizeof(char)*100);
	strcpy(res,dir_name);
	return res;
}

char* setlocale (int category, const char* locale)
{
	gtpd_locale = locale;
	char* res = (char*)malloc(sizeof(char)*100);
	strcpy(res,locale);
	return res;
}

#endif

Example usage:

// test.cpp
#include "gettextpd.h"
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
  setlocale( LC_ALL, "fr_FR" );
bindtextdomain( "hello", "." );
textdomain( "hello" );
std::cout << gettext("Hello, world!") << "\n";
std::cout << _("THis is A TeST StriNg") << "\n";
exit(0);
}

folder/fr_FR/LC_MESSAGES/hello.mo

Hello, world!	Zu bu zu translated str
THis is A TeST StriNg	test string translated this is#2

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