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/*
* Copyright 2021 Vincent Sanders <vince@netsurf-browser.org>
*
* This file is part of NetSurf, http://www.netsurf-browser.org/
*
* NetSurf is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* NetSurf is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <string.h>
extern "C" {
#include "utils/errors.h"
#include "utils/filepath.h"
}
#include "fltk/resources.h"
/** resource search path vector */
char **respaths;
/** maximum number of languages in language vector */
#define LANGV_SIZE 32
/** maximum length of all strings in language vector */
#define LANGS_SIZE 4096
/**
* obtain language from environment
*
* start with GNU extension LANGUAGE environment variable and then try
* POSIX variables LC_ALL, LC_MESSAGES and LANG
*
*/
static const char *get_language(void)
{
const char *lang;
lang = getenv("LANGUAGE");
if ((lang != NULL) && (lang[0] != '\0')) {
return lang;
}
lang = getenv("LC_ALL");
if ((lang != NULL) && (lang[0] != '\0')) {
return lang;
}
lang = getenv("LC_MESSAGES");
if ((lang != NULL) && (lang[0] != '\0')) {
return lang;
}
lang = getenv("LANG");
if ((lang != NULL) && (lang[0] != '\0')) {
return lang;
}
return NULL;
}
/** provide a string vector of languages in preference order
*
* environment variables are processed to aquire a colon separated
* list of languages which are converted into a string vector. The
* vector will always have the C language as its last entry.
*
* This implementation creates an internal static representation of
* the vector when first called and returns that for all subsequent
* calls. i.e. changing the environment does not change the returned
* vector on repeated calls.
*
* If the environment variables have more than LANGV_SIZE languages or
* LANGS_SIZE bytes of data the results list will be curtailed.
*/
static const char * const *get_languagev(void)
{
static const char *langv[LANGV_SIZE];
int langidx = 0; /* index of next entry in vector */
static char langs[LANGS_SIZE];
char *curp; /* next language parameter in langs string */
const char *lange; /* language from environment variable */
int lang_len;
char *cln; /* colon in lange */
/* return cached vector */
if (langv[0] != NULL) {
return &langv[0];
}
curp = &langs[0];
lange = get_language();
if (lange != NULL) {
lang_len = strlen(lange) + 1;
if (lang_len < (LANGS_SIZE - 2)) {
memcpy(curp, lange, lang_len);
while ((curp[0] != 0) &&
(langidx < (LANGV_SIZE - 2))) {
/* avoid using strchrnul as it is not portable */
cln = strchr(curp, ':');
if (cln == NULL) {
langv[langidx++] = curp;
curp += lang_len;
break;
} else {
if ((cln - curp) > 1) {
/* only place non empty entries in vector */
langv[langidx++] = curp;
}
*cln++ = 0; /* null terminate */
lang_len -= (cln - curp);
curp = cln;
}
}
}
}
/* ensure C language is present */
langv[langidx++] = curp;
*curp++ = 'C';
*curp++ = 0;
langv[langidx] = NULL;
return &langv[0];
}
/* exported interface documented in fltk/resources.h */
nserror nsfltk_init_resource_path(const char *resource_path)
{
const char * const *langv;
char **pathv; /* resource path string vector */
pathv = filepath_path_to_strvec(resource_path);
langv = get_languagev();
respaths = filepath_generate(pathv, langv);
filepath_free_strvec(pathv);
return NSERROR_OK;
}
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