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/* Routines for locating data files
Copyright (C) 2016 Free Software Foundation, Inc.
This file was written by Daiki Ueno <ueno@gnu.org>, 2016.
This program 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; either version 3 of the License, or
(at your option) any later version.
This program 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/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
/* Specification. */
#include "search-path.h"
#include <stdlib.h>
#include <string.h>
#include "concat-filename.h"
#include "relocatable.h"
#include "xalloc.h"
#include "xmemdup0.h"
#include "xvasprintf.h"
typedef void (* foreach_function_ty) (const char *dir, size_t len, void *data);
struct path_array_ty {
char **ptr;
size_t len;
const char *sub;
};
static void
foreach_elements (const char *dirs, foreach_function_ty function, void *data)
{
const char *start = dirs;
/* Count the number of valid elements in GETTEXTDATADIRS. */
while (*start != '\0')
{
char *end = strchrnul (start, ':');
/* Skip empty element. */
if (start != end)
function (start, end - start, data);
if (*end == '\0')
break;
start = end + 1;
}
}
static void
increment (const char *dir, size_t len, void *data)
{
size_t *count = data;
(*count)++;
}
static void
fill (const char *dir, size_t len, void *data)
{
struct path_array_ty *array = data;
char *base, *name;
base = xmemdup0 (dir, len);
if (array->sub == NULL)
name = base;
else
{
name = xconcatenated_filename (base, array->sub, NULL);
free (base);
}
array->ptr[array->len++] = name;
}
/* Find the standard search path for data files. Returns a NULL
terminated list of strings. The order in the path is as follows:
1. $GETTEXTDATADIR or GETTEXTDATADIR
2. $GETTEXTDATADIRS
3. $XDG_DATA_DIRS, where each element is suffixed with "gettext"
4. $GETTEXTDATADIR or GETTEXTDATADIR, suffixed with PACKAGE_SUFFIX */
char **
get_search_path (const char *sub)
{
const char *gettextdatadir;
const char *gettextdatadirs;
struct path_array_ty array;
char *base, *name;
size_t count = 2;
gettextdatadirs = getenv ("GETTEXTDATADIRS");
if (gettextdatadirs != NULL)
foreach_elements (gettextdatadirs, increment, &count);
gettextdatadirs = getenv ("XDG_DATA_DIRS");
if (gettextdatadirs != NULL)
foreach_elements (gettextdatadirs, increment, &count);
array.ptr = XCALLOC (count + 1, char *);
array.len = 0;
gettextdatadir = getenv ("GETTEXTDATADIR");
if (gettextdatadir == NULL || gettextdatadir[0] == '\0')
/* Make it possible to override the locator file location. This
is necessary for running the testsuite before "make
install". */
gettextdatadir = relocate (GETTEXTDATADIR);
/* Append element from GETTEXTDATADIR. */
if (sub == NULL)
name = xstrdup (gettextdatadir);
else
name = xconcatenated_filename (gettextdatadir, sub, NULL);
array.ptr[array.len++] = name;
/* Append elements from GETTEXTDATADIRS. */
array.sub = sub;
gettextdatadirs = getenv ("GETTEXTDATADIRS");
if (gettextdatadirs != NULL)
foreach_elements (gettextdatadirs, fill, &array);
/* Append elements from XDG_DATA_DIRS. Note that each element needs
to have "gettext" suffix. */
if (sub == NULL)
array.sub = xstrdup ("gettext");
else
array.sub = xconcatenated_filename ("gettext", sub, NULL);
gettextdatadirs = getenv ("XDG_DATA_DIRS");
if (gettextdatadirs != NULL)
foreach_elements (gettextdatadirs, fill, &array);
free (array.sub);
/* Append version specific directory. */
base = xasprintf ("%s%s", gettextdatadir, PACKAGE_SUFFIX);
if (sub == NULL)
name = base;
else
{
name = xconcatenated_filename (base, sub, NULL);
free (base);
}
array.ptr[array.len++] = name;
return array.ptr;
}
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