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/*
* cook - file construction tool
* Copyright (C) 1997, 1998 Peter Miller;
* All rights reserved.
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
*
* MANIFEST: functions to manipulate lefts
*/
#include <ac/stdlib.h>
#include <str.h>
#include <sub/left.h>
#include <sub/private.h>
#include <trace.h>
#include <wstr_list.h>
wstring_ty *
sub_left(scp, arg)
sub_context_ty *scp;
wstring_list_ty *arg;
{
wstring_ty *result;
string_ty *s;
long n;
trace(("sub_left()\n{\n"/*}*/));
if (arg->nitems != 3)
{
sub_context_error_set(scp, i18n("requires two arguments"));
trace(("return NULL;\n"));
trace((/*{*/"}\n"));
return 0;
}
s = wstr_to_str(arg->item[2]);
n = atol(s->str_text);
trace(("n = %ld\n", n));
str_free(s);
if (n <= 0)
result = wstr_from_c("");
else if (n > arg->item[1]->wstr_length)
result = wstr_copy(arg->item[1]);
else
result = wstr_n_from_wc(arg->item[1]->wstr_text, (size_t)n);
trace(("return %8.8lX;\n", (long)result));
trace((/*{*/"}\n"));
return result;
}
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