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/*! \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;
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);
}
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