/* 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, STRING, STRING string)
{
	char *s = MF_COPY_STRING(string);
	char *p;
	for (p = s; *p; p++)
		*p = toupper(*p);
	MF_RETURN(s);
}
END

MF_DEFUN(tolower, STRING, STRING string)
{
	char *s = MF_COPY_STRING(string);
	char *p;
	for (p = s; *p; p++)
		*p = tolower(*p);
	MF_RETURN(s);
}
END

MF_DEFUN(length, NUMBER, STRING string)
{
	MF_RETURN(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;
	}

	MF_ASSERT(start < len && end < len, mf_range,
		  "argument out of range");
	
	len = end - start + 1;
	s = MF_ALLOC_HEAP(len + 1);
	memcpy(s, string + start, len);
	s[len] = 0;
	
	MF_RETURN(s);
}
END

MF_DEFUN(substr, STRING, STRING string, NUMBER start, OPTIONAL, NUMBER nbytes)
{
	long len = strlen(string);
	char *s;
	
	MF_ASSERT(start >= 0, mf_range, "argument out of range");
	if (nbytes == 0)
		nbytes = len - start;
	
	s = MF_ALLOC_HEAP(nbytes + 1);
	memcpy(s, string + start, nbytes);
	s[nbytes] = 0;
	
	MF_RETURN(s);
}
END

MF_DEFUN(index, NUMBER, STRING str, STRING sub)
{
	char *p = strstr(str, sub);
	MF_RETURN(p ? p - str : -1);
}
END

MF_DEFUN(rindex, NUMBER, STRING str, STRING sub)
{
	int slen, xlen, rc;
	char *p, *s, *x;
	char *temp;

	slen = strlen(str);
	xlen = strlen(sub);
	temp = MF_ALLOC_HEAP_TEMP(xlen + slen + 2);
	s = temp;
	x = s + slen + 1;
	
	/* Reverse str */                     
#define REV(v,s,l)                                         \
	l = strlen(s);                                     \
	v[l] = 0;                                          \
	for (p = v + l - 1; p >= v; p--, s++)              \
		*p = *s;

	REV(s,str,slen);
	REV(x,sub,xlen);

	p = strstr(s, x);
	if (p)
		rc = slen - (p - s + xlen);
	else
		rc = -1;
	
	MF_RETURN(rc);
}
END

MF_DEFUN(revstr, STRING, STRING str)
{
	int len = strlen(str);
	char *p;
	char *s = MF_ALLOC_HEAP(len + 1);

	s[len] = 0;
	for (p = s + len - 1; p >= s; p--, str++)
		*p = *str;
	MF_RETURN(s);
}
END

MF_INIT