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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */

/* Cherokee
*
* Authors:
* Alvaro Lopez Ortega <alvaro@alobbs.com>
*
* Copyright (C) 2001-2011 Alvaro Lopez Ortega
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* 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.
*/

#include "common-internal.h"
#include "human_strcmp.h"

#include <ctype.h>


static int
parsenum (const char *a, const char **a_ret)
{
int result = *a - '0';

/* Parse the number
*/
++a;
while (isdigit(*a)) {
result *= 10;
result += *a - '0';
++a;
}

/* Return the new pointer
*/
if (a_ret)
*a_ret = a - 1;

/* .. and the number
*/
return result;
}


int
cherokee_human_strcmp (const char *a, const char *b)
{
int a0;
int b0;

/* Check corner cases
*/
if (unlikely (a == b))
return 0;
if (unlikely (a == NULL))
return -1;
if (unlikely (b == NULL))
return 1;

/* Iterate
*/
while (*a && *b) {
if (isdigit(*a))
a0 = parsenum(a, &a) + 256;
else
a0 = tolower(*a);

if (isdigit(*b))
b0 = parsenum(b, &b) + 256;
else
b0 = tolower(*b);

if (a0 < b0)
return -1;
if (a0 > b0)
return 1;

a++;
b++;
}

if (*a) return 1;
if (*b) return -1;

return 0;

}
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