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Diffstat (limited to 'src/reducer/validation_CH_AHV.c')
-rw-r--r-- | src/reducer/validation_CH_AHV.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/src/reducer/validation_CH_AHV.c b/src/reducer/validation_CH_AHV.c new file mode 100644 index 0000000..e6a2f25 --- /dev/null +++ b/src/reducer/validation_CH_AHV.c @@ -0,0 +1,57 @@ +/* + This file is part of Anastasis + Copyright (C) 2020, 2021 Taler Systems SA + + 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 redux/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 avh_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); +} |