/* This file is part of mailfrom filter.             -*- c -*-
   Copyright (C) 2006 Sergey Poznyakoff

   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, 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., 51 Franklin Street, Fifth Floor, Boston,
   MA 02110-1301 USA */

MF_DEFUN(toupper, NUMBER, STRING string)
{
	char *p;
	for (p = string; *p; p++)
		*p = toupper(*p);
	push(env, string);
}
END

MF_DEFUN(tolower, NUMBER, STRING string)
{
	char *p;
	for (p = string; *p; p++)
		*p = tolower(*p);
	push(env, string);
}
END

MF_DEFUN(length, NUMBER, STRING string)
{
	push(env, (STKVAL) strlen(string));
}
END

MF_DEFUN(substring, STRING, STRING string, NUMBER start, NUMBER end)
{
	long len = strlen(string);
	char *s;
	
	if (end < 0)
		end = len - 1;
	if (end < start) {
		long t = end;
		end = start;
		start = t;
	}

	if (start >= len || end >= len) {
		if (env_catch(env, mf_range) == 0)
			return;
		else
			runtime_error(env, "substring: argument out of range");
	}
	
	len = end - start + 1;
	s = heap_reserve(env, len + 1);
	memcpy(s, string + start, len);
	s[len] = 0;
	
	push(env, (STKVAL)s);
}
END

MF_INIT(string)