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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2003-2025 Free Software Foundation, Inc.
This library 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 3 of the License, or (at your option) any later version.
This library 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 library. If not, see
<http://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <mailutils/nls.h>
static int
_parse_lc_all (const char *arg, struct mu_lc_all *str, int flags)
{
char *s;
size_t n;
str->flags = 0;
n = strcspn (arg, "_.@");
if (flags & MU_LC_LANG)
{
s = malloc (n + 1);
if (!s)
return ENOMEM;
memcpy (s, arg, n);
s[n] = 0;
str->language = s;
str->flags |= MU_LC_LANG;
}
else
str->language = NULL;
arg += n;
if (arg[0] == '_')
{
arg++;
n = strcspn (arg, ".@");
if (flags & MU_LC_TERR)
{
s = malloc (n + 1);
if (!s)
return ENOMEM;
memcpy (s, arg, n);
s[n] = 0;
str->territory = s;
str->flags |= MU_LC_TERR;
}
else
str->territory = NULL;
arg += n;
}
if (arg[0] == '.')
{
arg++;
n = strcspn (arg, "@");
if (flags & MU_LC_CSET)
{
s = malloc (n + 1);
if (!s)
return ENOMEM;
memcpy (s, arg, n);
s[n] = 0;
str->charset = s;
str->flags |= MU_LC_CSET;
}
else
str->charset = NULL;
arg += n;
}
if (arg[0])
{
arg++;
if (flags & MU_LC_MOD)
{
str->modifier = strdup (arg);
if (!str->modifier)
return ENOMEM;
str->flags |= MU_LC_MOD;
}
}
return 0;
}
void
mu_lc_all_free (struct mu_lc_all *str)
{
if (str->flags & MU_LC_LANG)
free (str->language);
if (str->flags & MU_LC_TERR)
free (str->territory);
if (str->flags & MU_LC_CSET)
free (str->charset);
if (str->flags & MU_LC_MOD)
free (str->modifier);
str->flags = 0;
}
int
mu_parse_lc_all (const char *arg, struct mu_lc_all *str, int flags)
{
int rc;
memset (str, 0, sizeof (str[0]));
if (!arg)
{
if (flags & MU_LC_LANG)
{
str->language = strdup ("C");
if (!str->language)
return ENOMEM;
}
return 0;
}
/* If charset is requested (MU_LC_CSET), request also language and
territory. These will be used if ARG doesn't provide the charset
information. In any case, the surplus data will be discarded before
returning. */
rc = _parse_lc_all (arg, str,
(flags & MU_LC_CSET)
? (flags | MU_LC_LANG | MU_LC_TERR)
: flags);
if (rc == 0 && (flags & MU_LC_CSET))
{
if (!str->charset)
{
/* The caller requested charset, but we're unable to satisfy
the request based on the ARG only. Try the charset table
lookup. */
const char *charset =
mu_charset_lookup (str->language, str->territory);
if (charset)
{
/* Found it. Fill in the charset field. */
str->charset = strdup (charset);
if (!str->charset)
{
rc = ENOMEM;
goto err;
}
str->flags |= MU_LC_CSET;
}
}
/* The STR struct most probably contains data not requested by
the caller. First, see what these are. The following leaves
in FLAGS only those bits that weren't requested, but were filled
in just in case: */
flags = ~flags & str->flags;
/* Free the surplus data and clear the corresponding flag bits. */
if (flags & MU_LC_LANG)
{
free (str->language);
str->language = NULL;
str->flags &= ~MU_LC_LANG;
}
if (flags & MU_LC_TERR)
{
free (str->territory);
str->territory = NULL;
str->flags &= ~MU_LC_TERR;
}
}
err:
if (rc)
mu_lc_all_free (str);
return rc;
}
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