This is merely a historical archive of years 2008-2021, before the migration to mailman3.
A maintained and still updated list archive can be found at https://lists.osmocom.org/hyperkitty/list/gerrit-log@lists.osmocom.org/.
Neels Hofmeyr gerrit-no-reply at lists.osmocom.org
Review at https://gerrit.osmocom.org/6959
gsm: add osmo_mnc_from_str(), osmo_mnc_cmp(), osmo_plmn_cmp() for 3-digit MNC
osmo_mnc_from_str() preserves leading zeros in the string and is useful for
VTY config parsing (osmo-bsc, osmo-msc, osmo-sgsn, osmo-pcu).
osmo_{plmn,mnc}_cmp() takes care of the slight intricacy of ignoring the 3-digit flag
if the MNC is anyway >99. Will be used by osmo-sgsn.git and osmo-bsc.git. (All
current users just care about identical MNC, but a proper cmp doesn't hurt.)
Change-Id: Ib7176b1d65a03b76f41f94bc9d3293a8a07d24c6
add osmo_plmn_cmp()
Change-Id: I0910aee1e6be696002f37fe8d5c308cbd2bfc10b
---
M include/osmocom/gsm/gsm48.h
M src/gsm/gsm48.c
M src/gsm/libosmogsm.map
3 files changed, 80 insertions(+), 0 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/59/6959/1
diff --git a/include/osmocom/gsm/gsm48.h b/include/osmocom/gsm/gsm48.h
index d3732f3..3364d53 100644
--- a/include/osmocom/gsm/gsm48.h
+++ b/include/osmocom/gsm/gsm48.h
@@ -64,3 +64,8 @@
void osmo_plmn_to_bcd(uint8_t *bcd_dst, const struct osmo_plmn_id *plmn);
void osmo_plmn_from_bcd(const uint8_t *bcd_src, struct osmo_plmn_id *plmn);
+
+int osmo_mnc_from_str(const char *mnc_str, uint16_t *mnc, bool *mnc_3_digits);
+
+int osmo_mnc_cmp(uint16_t a_mnc, bool a_mnc_3_digits, uint16_t b_mnc, bool b_mnc_3_digits);
+int osmo_plmn_cmp(const struct osmo_plmn_id *a, const struct osmo_plmn_id *b);
diff --git a/src/gsm/gsm48.c b/src/gsm/gsm48.c
index 62f9277..8d31477 100644
--- a/src/gsm/gsm48.c
+++ b/src/gsm/gsm48.c
@@ -533,6 +533,78 @@
}
}
+/* 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)
+{
+ uint16_t _mnc = 0;
+ bool _mnc_3_digits = false;
+ char *endptr;
+ int rc = 0;
+
+ if (!mnc_str || !isdigit(mnc_str[0])) {
+ /* 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;
+ _mnc_3_digits = strlen(mnc_str) > 2;
+
+ if (mnc)
+ *mnc = _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);
+}
+
/*! Encode TS 04.08 Location Area Identifier, legacy implementation.
* Instead use osmo_generate_lai(), which is capable of three-digit MNC with leading zeros.
* \param[out] lai48 caller-provided memory for output
diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map
index 2c5b329..ffda6c2 100644
--- a/src/gsm/libosmogsm.map
+++ b/src/gsm/libosmogsm.map
@@ -270,6 +270,9 @@
osmo_plmn_name2;
osmo_lai_name;
osmo_rai_name;
+osmo_mnc_from_str;
+osmo_mnc_cmp;
+osmo_plmn_cmp;
gsm48_chan_mode_names;
gsm_chan_t_names;
gsm48_pdisc_names;
--
To view, visit https://gerrit.osmocom.org/6959
To unsubscribe, visit https://gerrit.osmocom.org/settings
Gerrit-MessageType: newchange
Gerrit-Change-Id: I0910aee1e6be696002f37fe8d5c308cbd2bfc10b
Gerrit-PatchSet: 1
Gerrit-Project: libosmocore
Gerrit-Branch: master
Gerrit-Owner: Neels Hofmeyr <nhofmeyr at sysmocom.de>