diff options
Diffstat (limited to 'src/gsm/gsm23003.c')
| -rw-r--r-- | src/gsm/gsm23003.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/src/gsm/gsm23003.c b/src/gsm/gsm23003.c index 63de2b81..1f6bf7d0 100644 --- a/src/gsm/gsm23003.c +++ b/src/gsm/gsm23003.c @@ -25,6 +25,9 @@ #include <ctype.h> #include <stdio.h> +#include <stdlib.h> +#include <errno.h> +#include <string.h> #include <osmocom/gsm/gsm23003.h> #include <osmocom/gsm/protocol/gsm_23_003.h> @@ -195,3 +198,77 @@ void osmo_plmn_from_bcd(const uint8_t *bcd_src, struct osmo_plmn_id *plmn) plmn->mnc_3_digits = true; } } + +/* Convert string to MNC, detecting 3-digit MNC with leading zeros. + * Return mnc_3_digits as false if the MNC's most significant digit is encoded as 0xF, true + * otherwise; i.e. true if MNC > 99 or if it is represented with leading zeros instead of 0xF. + * \param mnc_str[in] String representation of an MNC, with or without leading zeros. + * \param mnc[out] MNC result buffer, or NULL. + * \param[out] mnc_3_digits Result buffer for 3-digit flag, or NULL. + * \returns zero on success, -EINVAL in case of surplus characters, negative errno in case of conversion + * errors. + */ +int osmo_mnc_from_str(const char *mnc_str, uint16_t *mnc, bool *mnc_3_digits) +{ + long int _mnc = 0; + bool _mnc_3_digits = false; + char *endptr; + int rc = 0; + + if (!mnc_str || !isdigit(mnc_str[0]) || strlen(mnc_str) > 3) { + /* return invalid, but give strtol a shot anyway, for callers that don't want to be + * strict */ + rc = -EINVAL; + } + errno = 0; + _mnc = strtol(mnc_str, &endptr, 10); + if (errno) + rc = -errno; + else if (*endptr) + rc = -EINVAL; + if (_mnc < 0 || _mnc > 999) + rc = -EINVAL; + _mnc_3_digits = strlen(mnc_str) > 2; + + if (mnc) + *mnc = (uint16_t)_mnc; + if (mnc_3_digits) + *mnc_3_digits = _mnc_3_digits; + return rc; +} + +/* Compare two MNC with three-digit flag. + * The mnc_3_digits flags passed in only have an effect if the MNC are < 100, i.e. if they would amount + * to a change in leading zeros in a BCD representation. An MNC >= 100 implies three digits, and the flag + * is actually ignored. + * \param a_mnc[in] "Left" side MNC. + * \param a_mnc_3_digits[in] "Left" side three-digits flag. + * \param b_mnc[in] "Right" side MNC. + * \param b_mnc_3_digits[in] "Right" side three-digits flag. + * \returns 0 if the MNC are equal, -1 if a < b or a shorter, 1 if a > b or a longer. */ +int osmo_mnc_cmp(uint16_t a_mnc, bool a_mnc_3_digits, uint16_t b_mnc, bool b_mnc_3_digits) +{ + if (a_mnc < b_mnc) + return -1; + if (a_mnc > b_mnc) + return 1; + /* a_mnc == b_mnc, but same amount of leading zeros? */ + if (a_mnc < 100 && a_mnc_3_digits != b_mnc_3_digits) + return a_mnc_3_digits ? 1 : -1; + return 0; +} + +/* Compare two PLMN. + * \param a[in] "Left" side PLMN. + * \param b[in] "Right" side PLMN. + * \returns 0 if the PLMN are equal, -1 if a < b or a shorter, 1 if a > b or a longer. */ +int osmo_plmn_cmp(const struct osmo_plmn_id *a, const struct osmo_plmn_id *b) +{ + if (a == b) + return 0; + if (a->mcc < b->mcc) + return -1; + if (a->mcc > b->mcc) + return 1; + return osmo_mnc_cmp(a->mnc, a->mnc_3_digits, b->mnc, b->mnc_3_digits); +} |