| /*! \file gsm23003.c |
| * Utility function implementations related to 3GPP TS 23.003 */ |
| /* |
| * (C) 2017 sysmocom s.f.m.c. GmbH <info@sysmocom.de> |
| * All Rights Reserved |
| * |
| * Author: Neels Hofmeyr <nhofmeyr@sysmocom.de> |
| * |
| * 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 of the License, 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. |
| * |
| */ |
| |
| #include <ctype.h> |
| |
| #include <osmocom/gsm/gsm23003.h> |
| #include <osmocom/gsm/protocol/gsm_23_003.h> |
| |
| static bool is_n_digits(const char *str, int min_digits, int max_digits) |
| { |
| int len; |
| /* Use unsigned char * to avoid a compiler warning of |
| * "error: array subscript has type 'char' [-Werror=char-subscripts]" */ |
| const unsigned char *pos = (const unsigned char *)str; |
| if (!pos) |
| return min_digits < 1; |
| for (len = 0; *pos && len < max_digits; len++, pos++) |
| if (!isdigit(*pos)) |
| return false; |
| if (len < min_digits) |
| return false; |
| /* With not too many digits, we should have reached *str == nul */ |
| if (*pos) |
| return false; |
| return true; |
| } |
| |
| /*! Determine whether the given IMSI is valid according to 3GPP TS 23.003. |
| * \param imsi IMSI digits in ASCII string representation. |
| * \returns true when the IMSI is valid, false for invalid characters or number |
| * of digits. |
| */ |
| bool osmo_imsi_str_valid(const char *imsi) |
| { |
| return is_n_digits(imsi, GSM23003_IMSI_MIN_DIGITS, GSM23003_IMSI_MAX_DIGITS); |
| } |
| |
| /*! Determine whether the given MSISDN is valid according to 3GPP TS 23.003. |
| * \param msisdn MSISDN digits in ASCII string representation. |
| * \returns true when the MSISDN is valid, false for invalid characters or number |
| * of digits. |
| */ |
| bool osmo_msisdn_str_valid(const char *msisdn) |
| { |
| return is_n_digits(msisdn, 1, 15); |
| } |