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/*
This file is part of Anastasis
Copyright (C) 2020, 2021 Anastasis SARL
Anastasis 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, or (at your option) any later version.
Anastasis 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
Anastasis; see the file COPYING.GPL. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file reducer/validation_CH_AHV.c
* @brief anastasis reducer api
* @author Christian Grothoff
* @author Dominik Meister
* @author Dennis Neufeld
*/
#include <string.h>
#include <stdbool.h>
/**
* Function to validate a Swiss AHV number.
*
* @param ahv_number ahv number to validate (input)
* @return true if validation passed, else false
*/
bool
CH_AHV_check (const char *ahv_number)
{
unsigned int checknum;
unsigned int next_ten;
const char *pos = &ahv_number[strlen (ahv_number) - 1];
bool phase = true;
unsigned int calculation = 0;
checknum = *pos - 48;
while (pos > ahv_number)
{
pos--;
if ('.' == *pos)
continue;
if (phase)
calculation += ((*pos - 48) * 3);
else
calculation += *pos - 48;
phase = ! phase;
}
/* round up to the next ten */
next_ten = ((calculation + 9) / 10) * 10;
calculation = next_ten - calculation;
return (checknum == calculation);
}
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