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/* Make the global locale minimally POSIX compliant.
Copyright (C) 2025 Free Software Foundation, Inc.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
This file 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "setlocale-fixes.h"
#if defined _WIN32 && !defined __CYGWIN__
# include <stddef.h>
# include <string.h>
/* The system does not store an LC_MESSAGES locale category. Do it here. */
static char lc_messages_name[64] = "C";
const char *
setlocale_messages (const char *name)
{
if (name != NULL)
{
lc_messages_name[sizeof (lc_messages_name) - 1] = '\0';
strncpy (lc_messages_name, name, sizeof (lc_messages_name) - 1);
}
return lc_messages_name;
}
const char *
setlocale_messages_null (void)
{
/* This implementation is multithread-safe, assuming no other thread changes
the LC_MESSAGES locale category. */
return lc_messages_name;
}
#endif
#if defined __ANDROID__
# include <stddef.h>
# include <stdlib.h>
# include <locale.h>
# include <string.h>
/* Use the system's setlocale() function, not the gnulib override, here. */
# undef setlocale
/* Storage for the name of each category of the global locale.
Regarding the size, cf. SETLOCALE_NULL_MAX. */
static char lc_cat_name[12][256+1] =
{ "C", "C", "C", "C", "C", "C", "C", "C", "C", "C", "C", "C" };
/* Mapping from the valid categories to the indices 0..12-1. */
#define cat_to_index(cat) ((cat) - ((cat) >= LC_ALL))
/* Mapping from the indicess 0..12-1 to the valid categories. */
#define index_to_cat(i) ((i) + ((i) >= LC_ALL))
/* Storage for the name of the entire global locale.
For mixed locales, use the syntax from glibc:
LC_CTYPE=...;LC_NUMERIC=...;......;LC_IDENTIFICATION=...
Regarding the size, cf. SETLOCALE_NULL_ALL_MAX. */
static char lc_all_name[148+12*256+1];
/* Category names. */
static const char cat_names[12][17+1] =
{
[cat_to_index (LC_CTYPE)] = "LC_CTYPE",
[cat_to_index (LC_NUMERIC)] = "LC_NUMERIC",
[cat_to_index (LC_TIME)] = "LC_TIME",
[cat_to_index (LC_COLLATE)] = "LC_COLLATE",
[cat_to_index (LC_MONETARY)] = "LC_MONETARY",
[cat_to_index (LC_MESSAGES)] = "LC_MESSAGES",
[cat_to_index (LC_PAPER)] = "LC_PAPER",
[cat_to_index (LC_NAME)] = "LC_NAME",
[cat_to_index (LC_ADDRESS)] = "LC_ADDRESS",
[cat_to_index (LC_TELEPHONE)] = "LC_TELEPHONE",
[cat_to_index (LC_MEASUREMENT)] = "LC_MEASUREMENT",
[cat_to_index (LC_IDENTIFICATION)] = "LC_IDENTIFICATION",
};
/* Combines the contents of all lc_cat_name[], filling lc_all_name. */
static void
fill_lc_all_name (void)
{
bool all_same = true;
for (size_t i = 1; i < 12; i++)
if (!streq (lc_cat_name[i], lc_cat_name[0]))
{
all_same = false;
break;
}
if (all_same)
/* Produce a simple locale name. */
strcpy (lc_all_name, lc_cat_name[0]);
else
{
/* Produce a mixed locale name. */
size_t i;
char *q;
for (i = 0, q = lc_all_name; i < 12; i++)
{
const char *p = cat_names[i];
size_t n = strlen (p);
memcpy (q, p, n); q += n;
*q++ = '=';
p = lc_cat_name[i];
n = strlen (p);
memcpy (q, p, n); q += n;
*q++ = ';';
}
*--q = '\0';
}
}
/* Extracts the name of a single category from NAME and stores it in
SINGLE_NAME. CATEGORY must be a valid category name != LC_ALL.
This is basically the opposite of fill_lc_all_name. */
static int
extract_single_name (char single_name[256+1], int category, const char *name)
{
if (strchr (name, ';') != NULL)
{
/* A mixed locale name. */
const char *cat_name = cat_names[cat_to_index (category)];
size_t cat_name_len = strlen (cat_name);
const char *p = name;
for (;;)
{
const char *q = strchr (p, ';');
if (strncmp (p, cat_name, cat_name_len) == 0
&& p[cat_name_len] == '=')
{
p += cat_name_len + 1;
size_t n = (q == NULL ? strlen (p) : q - p);
if (n >= 256+1)
n = 256;
memcpy (single_name, p, n);
single_name[n] = '\0';
return 0;
}
if (q == NULL)
break;
p = q + 1;
}
return -1;
}
else
{
/* A simple locale name. */
size_t n = strlen (name);
if (n >= 256+1)
n = 256;
memcpy (single_name, name, n);
single_name[n] = '\0';
return 0;
}
}
const char *
setlocale_fixed (int category, const char *name)
{
if (category == LC_ALL)
{
if (name != NULL)
{
char single_name[256+1];
int i;
/* Test whether NAME is valid. */
for (i = 12-1; i >= 0; i--)
if (extract_single_name (single_name, index_to_cat (i), name) < 0)
return NULL;
/* Now single_name contains the one for the index 0,
i.e. for LC_CTYPE. */
if (setlocale (LC_CTYPE, single_name) == NULL)
return NULL;
/* Fill lc_cat_name[]. */
for (i = 12-1; i >= 0; i--)
{
if (extract_single_name (single_name, index_to_cat (i), name) < 0)
abort ();
strcpy (lc_cat_name[i], single_name);
}
/* Update lc_all_name. */
fill_lc_all_name ();
}
return lc_all_name;
}
if (category >= LC_CTYPE && category <= LC_IDENTIFICATION)
{
if (name != NULL)
{
char single_name[256+1];
/* Test whether NAME is valid. */
if (extract_single_name (single_name, category, name) < 0)
return NULL;
if (category == LC_CTYPE)
if (setlocale (category, single_name) == NULL)
return NULL;
/* Fill lc_cat_name[]. */
strcpy (lc_cat_name[cat_to_index (category)], single_name);
/* Update lc_all_name. */
fill_lc_all_name ();
}
return lc_cat_name[cat_to_index (category)];
}
return NULL;
}
const char *
setlocale_fixed_null (int category)
{
/* This implementation is multithread-safe, assuming no other thread changes
any locale category. */
if (category == LC_ALL)
return lc_all_name;
if (category >= LC_CTYPE && category <= LC_IDENTIFICATION)
return lc_cat_name[cat_to_index (category)];
return NULL;
}
#endif
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