mirror of https://gerrit.osmocom.org/libosmocore
69 lines
2.3 KiB
C
69 lines
2.3 KiB
C
/*! \file gsm23003.c
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* Utility function implementations related to 3GPP TS 23.003 */
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/*
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* (C) 2017 sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
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* Author: Neels Hofmeyr <nhofmeyr@sysmocom.de>
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* All Rights Reserved
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*
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* SPDX-License-Identifier: GPL-2.0+
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <ctype.h>
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#include <osmocom/gsm/gsm23003.h>
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#include <osmocom/gsm/protocol/gsm_23_003.h>
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static bool is_n_digits(const char *str, int min_digits, int max_digits)
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{
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int len;
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/* Use unsigned char * to avoid a compiler warning of
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* "error: array subscript has type 'char' [-Werror=char-subscripts]" */
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const unsigned char *pos = (const unsigned char *)str;
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if (!pos)
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return min_digits < 1;
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for (len = 0; *pos && len < max_digits; len++, pos++)
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if (!isdigit(*pos))
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return false;
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if (len < min_digits)
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return false;
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/* With not too many digits, we should have reached *str == nul */
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if (*pos)
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return false;
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return true;
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}
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/*! Determine whether the given IMSI is valid according to 3GPP TS 23.003.
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* \param imsi IMSI digits in ASCII string representation.
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* \returns true when the IMSI is valid, false for invalid characters or number
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* of digits.
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*/
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bool osmo_imsi_str_valid(const char *imsi)
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{
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return is_n_digits(imsi, GSM23003_IMSI_MIN_DIGITS, GSM23003_IMSI_MAX_DIGITS);
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}
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/*! Determine whether the given MSISDN is valid according to 3GPP TS 23.003.
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* \param msisdn MSISDN digits in ASCII string representation.
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* \returns true when the MSISDN is valid, false for invalid characters or number
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* of digits.
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*/
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bool osmo_msisdn_str_valid(const char *msisdn)
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{
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return is_n_digits(msisdn, 1, 15);
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}
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