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-rw-r--r--src/gsm/gad.c491
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diff --git a/src/gsm/gad.c b/src/gsm/gad.c
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+/* 3GPP TS 23.032 GAD: Universal Geographical Area Description */
+/*
+ * (C) 2020 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
+ *
+ * All Rights Reserved
+ *
+ * Author: Neels Hofmeyr <neels@hofmeyr.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <errno.h>
+#include <inttypes.h>
+#include <osmocom/core/msgb.h>
+#include <osmocom/core/utils.h>
+#include <osmocom/gsm/gad.h>
+
+/*! \addtogroup gad
+ * @{
+ * \file gad.c
+ * Message encoding and decoding for 3GPP TS 23.032 GAD: Universal Geographical Area Description.
+ */
+
+const struct value_string osmo_gad_type_names[] = {
+ { GAD_TYPE_ELL_POINT, "Ellipsoid-point" },
+ { GAD_TYPE_ELL_POINT_UNC_CIRCLE, "Ellipsoid-point-with-uncertainty-circle" },
+ { GAD_TYPE_ELL_POINT_UNC_ELLIPSE, "Ellipsoid-point-with-uncertainty-ellipse" },
+ { GAD_TYPE_POLYGON, "Polygon" },
+ { GAD_TYPE_ELL_POINT_ALT, "Ellipsoid-point-with-altitude" },
+ { GAD_TYPE_ELL_POINT_ALT_UNC_ELL, "Ellipsoid-point-with-altitude-and-uncertainty-ellipsoid" },
+ { GAD_TYPE_ELL_ARC, "Ellipsoid-arc" },
+ { GAD_TYPE_HA_ELL_POINT_UNC_ELLIPSE, "High-accuracy-ellipsoid-point-with-uncertainty-ellipse" },
+ { GAD_TYPE_HA_ELL_POINT_ALT_UNC_ELL, "High-accuracy-ellipsoid-point-with-altitude-and-uncertainty-ellipsoid" },
+ {}
+};
+
+/*! Encode a latitude value according to 3GPP TS 23.032.
+ * Useful to clamp a latitude to an actually encodable accuracy:
+ * set_lat = osmo_gad_dec_lat(osmo_gad_enc_lat(orig_lat));
+ * \param[in] deg_1e6 Latitude in micro degrees (degrees * 1e6), -90'000'000 (S) .. 90'000'000 (N).
+ * \returns encoded latitude in host-byte-order (24bit).
+ */
+uint32_t osmo_gad_enc_lat(int32_t deg_1e6)
+{
+ /* N <= ((2**23)/90)*X < N+1
+ * N: encoded latitude
+ * X: latitude in degrees
+ */
+ int32_t sign = 0;
+ int64_t x;
+ deg_1e6 = OSMO_MAX(-90000000, OSMO_MIN(90000000, deg_1e6));
+ if (deg_1e6 < 0) {
+ sign = 1 << 23;
+ deg_1e6 = -deg_1e6;
+ }
+ x = deg_1e6;
+ x <<= 23;
+ x += (1 << 23) - 1;
+ x /= 90 * 1000000;
+ return sign | (x & 0x7fffff);
+}
+
+/*! Decode a latitude value according to 3GPP TS 23.032.
+ * Useful to clamp a latitude to an actually encodable accuracy:
+ * set_lat = osmo_gad_dec_lat(osmo_gad_enc_lat(orig_lat));
+ * \param[in] lat encoded latitude in host-byte-order (24bit).
+ * \returns decoded latitude in micro degrees (degrees * 1e6), -90'000'000 (S) .. 90'000'000 (N).
+ */
+int32_t osmo_gad_dec_lat(uint32_t lat)
+{
+ int64_t sign = 1;
+ int64_t x;
+ if (lat & 0x800000) {
+ sign = -1;
+ lat &= 0x7fffff;
+ }
+ x = lat;
+ x *= 90 * 1000000;
+ x >>= 23;
+ x *= sign;
+ return x;
+}
+
+/*! Encode a longitude value according to 3GPP TS 23.032.
+ * Useful to clamp a longitude to an actually encodable accuracy:
+ * set_lon = osmo_gad_dec_lon(osmo_gad_enc_lon(orig_lon));
+ * \param[in] deg_1e6 Longitude in micro degrees (degrees * 1e6), -180'000'000 (W) .. 180'000'000 (E).
+ * \returns encoded longitude in host-byte-order (24bit).
+ */
+uint32_t osmo_gad_enc_lon(int32_t deg_1e6)
+{
+ /* -180 .. 180 degrees mapped to a signed 24 bit integer.
+ * N <= ((2**24)/360) * X < N+1
+ * N: encoded longitude
+ * X: longitude in degrees
+ */
+ int64_t x;
+ deg_1e6 = OSMO_MAX(-180000000, OSMO_MIN(180000000, deg_1e6));
+ x = deg_1e6;
+ x *= (1 << 24);
+ if (deg_1e6 >= 0)
+ x += (1 << 24) - 1;
+ else
+ x -= (1 << 24) - 1;
+ x /= 360 * 1000000;
+ return (uint32_t)(x & 0xffffff);
+}
+
+/*! Decode a longitude value according to 3GPP TS 23.032.
+ * Normally, encoding and decoding is done via osmo_gad_enc() and osmo_gad_dec() for entire PDUs. But calling this
+ * directly can be useful to clamp a longitude to an actually encodable accuracy:
+ * int32_t set_lon = osmo_gad_dec_lon(osmo_gad_enc_lon(orig_lon));
+ * \param[in] lon Encoded longitude.
+ * \returns Longitude in micro degrees (degrees * 1e6), -180'000'000 (W) .. 180'000'000 (E).
+ */
+int32_t osmo_gad_dec_lon(uint32_t lon)
+{
+ /* -180 .. 180 degrees mapped to a signed 24 bit integer.
+ * N <= ((2**24)/360) * X < N+1
+ * N: encoded longitude
+ * X: longitude in degrees
+ */
+ int32_t slon;
+ int64_t x;
+ if (lon & 0x800000) {
+ /* make the 24bit negative number to a 32bit negative number */
+ slon = lon | 0xff000000;
+ } else {
+ slon = lon;
+ }
+ x = slon;
+ x *= 360 * 1000000;
+ x /= (1 << 24);
+ return x;
+}
+
+/*
+ * r = C((1+x)**K - 1)
+ * C = 10, x = 0.1
+ *
+ * def r(k):
+ * return 10.*(((1+0.1)**k) -1 )
+ * for k in range(128):
+ * print('%d,' % (r(k) * 1000.))
+ */
+static uint32_t table_uncertainty_1e3[128] = {
+ 0, 1000, 2100, 3310, 4641, 6105, 7715, 9487, 11435, 13579, 15937, 18531, 21384, 24522, 27974, 31772, 35949,
+ 40544, 45599, 51159, 57274, 64002, 71402, 79543, 88497, 98347, 109181, 121099, 134209, 148630, 164494, 181943,
+ 201137, 222251, 245476, 271024, 299126, 330039, 364043, 401447, 442592, 487851, 537636, 592400, 652640, 718904,
+ 791795, 871974, 960172, 1057189, 1163908, 1281299, 1410429, 1552472, 1708719, 1880591, 2069650, 2277615,
+ 2506377, 2758014, 3034816, 3339298, 3674227, 4042650, 4447915, 4893707, 5384077, 5923485, 6516834, 7169517,
+ 7887469, 8677216, 9545938, 10501531, 11552685, 12708953, 13980849, 15379933, 16918927, 18611820, 20474002,
+ 22522402, 24775642, 27254206, 29980627, 32979690, 36278659, 39907525, 43899277, 48290205, 53120226, 58433248,
+ 64277573, 70706330, 77777964, 85556760, 94113436, 103525780, 113879358, 125268293, 137796123, 151576735,
+ 166735409, 183409950, 201751945, 221928139, 244121953, 268535149, 295389664, 324929630, 357423593, 393166952,
+ 432484648, 475734112, 523308524, 575640376, 633205414, 696526955, 766180651, 842799716, 927080688, 1019789756,
+ 1121769732, 1233947705, 1357343476, 1493078824, 1642387706, 1806627477,
+};
+
+/*! Decode an uncertainty circle value according to 3GPP TS 23.032.
+ * Useful to clamp a value to an actually encodable accuracy:
+ * set_unc = osmo_gad_dec_unc(osmo_gad_enc_unc(orig_unc));
+ * \param[in] unc Encoded uncertainty value.
+ * \returns Uncertainty value in millimeters.
+ */
+uint32_t osmo_gad_dec_unc(uint8_t unc)
+{
+ return table_uncertainty_1e3[unc & 0x7f];
+}
+
+/*! Encode an uncertainty circle value according to 3GPP TS 23.032.
+ * Normally, encoding and decoding is done via osmo_gad_enc() and osmo_gad_dec() for entire PDUs. But calling this
+ * directly can be useful to clamp a value to an actually encodable accuracy:
+ * uint32_t set_unc = osmo_gad_dec_unc(osmo_gad_enc_unc(orig_unc));
+ * \param[in] mm Uncertainty value in millimeters.
+ * \returns Encoded uncertainty value.
+ */
+uint8_t osmo_gad_enc_unc(uint32_t mm)
+{
+ uint8_t unc;
+ for (unc = 0; unc < ARRAY_SIZE(table_uncertainty_1e3); unc++) {
+ if (table_uncertainty_1e3[unc] > mm)
+ return unc - 1;
+ }
+ return 127;
+}
+
+/* So far we don't encode a high-accuracy uncertainty anywhere, so these static items would flag as compiler warnings
+ * for unused items. As soon as any HA items get used, remove this ifdef. */
+#ifdef GAD_FUTURE
+
+/*
+ * r = C((1+x)**K - 1)
+ * C = 0.3, x = 0.02
+ *
+ * def r(k):
+ * return 0.3*(((1+0.02)**k) -1 )
+ * for k in range(256):
+ * print('%d,' % (r(k) * 1000.))
+ */
+static uint32_t table_ha_uncertainty_1e3[256] = {
+ 0, 6, 12, 18, 24, 31, 37, 44, 51, 58, 65, 73, 80, 88, 95, 103, 111, 120, 128, 137, 145, 154, 163, 173, 182, 192,
+ 202, 212, 222, 232, 243, 254, 265, 276, 288, 299, 311, 324, 336, 349, 362, 375, 389, 402, 417, 431, 445, 460,
+ 476, 491, 507, 523, 540, 556, 574, 591, 609, 627, 646, 665, 684, 703, 724, 744, 765, 786, 808, 830, 853, 876,
+ 899, 923, 948, 973, 998, 1024, 1051, 1078, 1105, 1133, 1162, 1191, 1221, 1252, 1283, 1314, 1347, 1380, 1413,
+ 1447, 1482, 1518, 1554, 1592, 1629, 1668, 1707, 1748, 1788, 1830, 1873, 1916, 1961, 2006, 2052, 2099, 2147,
+ 2196, 2246, 2297, 2349, 2402, 2456, 2511, 2567, 2625, 2683, 2743, 2804, 2866, 2929, 2994, 3060, 3127, 3195,
+ 3265, 3336, 3409, 3483, 3559, 3636, 3715, 3795, 3877, 3961, 4046, 4133, 4222, 4312, 4404, 4498, 4594, 4692,
+ 4792, 4894, 4998, 5104, 5212, 5322, 5435, 5549, 5666, 5786, 5907, 6032, 6158, 6287, 6419, 6554, 6691, 6830,
+ 6973, 7119, 7267, 7418, 7573, 7730, 7891, 8055, 8222, 8392, 8566, 8743, 8924, 9109, 9297, 9489, 9685, 9884,
+ 10088, 10296, 10508, 10724, 10944, 11169, 11399, 11633, 11871, 12115, 12363, 12616, 12875, 13138, 13407, 13681,
+ 13961, 14246, 14537, 14834, 15136, 15445, 15760, 16081, 16409, 16743, 17084, 17431, 17786, 18148, 18517, 18893,
+ 19277, 19669, 20068, 20475, 20891, 21315, 21747, 22188, 22638, 23096, 23564, 24042, 24529, 25025, 25532, 26048,
+ 26575, 27113, 27661, 28220, 28791, 29372, 29966, 30571, 31189, 31818, 32461, 33116, 33784, 34466, 35161, 35871,
+ 36594, 37332, 38085, 38852, 39635, 40434, 41249, 42080, 42927, 43792, 44674, 45573, 46491,
+};
+
+static uint32_t osmo_gad_dec_ha_unc(uint8_t unc)
+{
+ return table_uncertainty_1e3[unc];
+}
+
+static uint8_t osmo_gad_enc_ha_unc(uint32_t mm)
+{
+ uint8_t unc;
+ for (unc = 0; unc < ARRAY_SIZE(table_ha_uncertainty_1e3); unc++) {
+ if (table_uncertainty_1e3[unc] > mm)
+ return unc - 1;
+ }
+ return 255;
+}
+
+#endif /* GAD_FUTURE */
+
+/* Return error code, and, if required, allocate and populate struct osmo_gad_err. */
+#define DEC_ERR(RC, TYPE, fmt, args...) do { \
+ if (err) { \
+ *err = talloc_zero(err_ctx, struct osmo_gad_err); \
+ **err = (struct osmo_gad_err){ \
+ .rc = (RC), \
+ .type = (TYPE), \
+ .logmsg = talloc_asprintf(*err, "Error decoding GAD%s%s: " fmt, \
+ ((int)(TYPE)) >= 0 ? " " : "", \
+ ((int)(TYPE)) >= 0 ? osmo_gad_type_name(TYPE) : "", ##args), \
+ }; \
+ } \
+ return RC; \
+ } while(0)
+
+static int osmo_gad_enc_ell_point_unc_circle(struct gad_raw_ell_point_unc_circle *raw, const struct osmo_gad_ell_point_unc_circle *v)
+{
+ if (v->lat < -90000000 || v->lat > 90000000)
+ return -EINVAL;
+ if (v->lon < -180000000 || v->lon > 180000000)
+ return -EINVAL;
+ *raw = (struct gad_raw_ell_point_unc_circle){
+ .h = { .type = GAD_TYPE_ELL_POINT_UNC_CIRCLE },
+ .unc = osmo_gad_enc_unc(v->unc),
+ };
+ osmo_store32be_ext(osmo_gad_enc_lat(v->lat), raw->lat, 3);
+ osmo_store32be_ext(osmo_gad_enc_lon(v->lon), raw->lon, 3);
+ return sizeof(raw);
+}
+
+static int osmo_gad_dec_ell_point_unc_circle(struct osmo_gad_ell_point_unc_circle *v,
+ struct osmo_gad_err **err, void *err_ctx,
+ const struct gad_raw_ell_point_unc_circle *raw)
+{
+ /* Load 24bit big endian */
+ v->lat = osmo_gad_dec_lat(osmo_load32be_ext_2(raw->lat, 3));
+ v->lon = osmo_gad_dec_lon(osmo_load32be_ext_2(raw->lon, 3));
+
+ if (raw->spare2)
+ DEC_ERR(-EINVAL, raw->h.type, "Bit 8 of Uncertainty code should be zero");
+
+ v->unc = osmo_gad_dec_unc(raw->unc);
+ return 0;
+}
+
+static int osmo_gad_raw_len(const union gad_raw *gad_raw)
+{
+ switch (gad_raw->h.type) {
+ case GAD_TYPE_ELL_POINT:
+ return sizeof(gad_raw->ell_point);
+ case GAD_TYPE_ELL_POINT_UNC_CIRCLE:
+ return sizeof(gad_raw->ell_point_unc_circle);
+ case GAD_TYPE_ELL_POINT_UNC_ELLIPSE:
+ return sizeof(gad_raw->ell_point_unc_ellipse);
+ case GAD_TYPE_POLYGON:
+ if (gad_raw->polygon.h.num_points < 3)
+ return -EINVAL;
+ return sizeof(gad_raw->polygon.h)
+ + gad_raw->polygon.h.num_points * sizeof(gad_raw->polygon.point[0]);
+ case GAD_TYPE_ELL_POINT_ALT:
+ return sizeof(gad_raw->ell_point_alt);
+ case GAD_TYPE_ELL_POINT_ALT_UNC_ELL:
+ return sizeof(gad_raw->ell_point_alt_unc_ell);
+ case GAD_TYPE_ELL_ARC:
+ return sizeof(gad_raw->ell_arc);
+ case GAD_TYPE_HA_ELL_POINT_UNC_ELLIPSE:
+ return sizeof(gad_raw->ha_ell_point_unc_ell);
+ case GAD_TYPE_HA_ELL_POINT_ALT_UNC_ELL:
+ return sizeof(gad_raw->ha_ell_point_alt_unc_ell);
+ default:
+ return -ENOTSUP;
+ }
+}
+
+/*! Append a GAD PDU to the msgb.
+ * Write the correct number of bytes depending on the GAD type and possibly on variable length attributes.
+ * \param[out] msg Append to this msgb.
+ * \param[in] gad_raw GAD data to write.
+ * \returns number of bytes appended to msgb, or negative on failure.
+ */
+int osmo_gad_raw_write(struct msgb *msg, const union gad_raw *gad_raw)
+{
+ int len;
+ uint8_t *dst;
+ len = osmo_gad_raw_len(gad_raw);
+ if (len < 0)
+ return len;
+ dst = msgb_put(msg, len);
+ memcpy(dst, (void*)gad_raw, len);
+ return len;
+}
+
+/*! Read a GAD PDU and validate structure.
+ * Memcpy from data to gad_raw struct, and validate correct length depending on the GAD type and possibly on variable
+ * length attributes.
+ * \param[out] gad_raw Copy GAD PDU here.
+ * \param[out] err Returned pointer to error info, dynamically allocated; NULL to not return any.
+ * \param[in] err_ctx Talloc context to allocate err from, if required.
+ * \param[in] data Encoded GAD bytes buffer.
+ * \param[in] len Length of data in bytes.
+ * \returns 0 on success, negative on error. If returning negative and err was non-NULL, *err is guaranteed to point to
+ * an allocated struct osmo_gad_err.
+ */
+int osmo_gad_raw_read(union gad_raw *gad_raw, struct osmo_gad_err **err, void *err_ctx, const uint8_t *data, uint8_t len)
+{
+ int gad_len;
+ const union gad_raw *src;
+ if (err)
+ *err = NULL;
+ if (len < sizeof(src->h))
+ DEC_ERR(-EINVAL, -1, "GAD data too short for header (%u bytes)", len);
+
+ src = (void*)data;
+ gad_len = osmo_gad_raw_len(src);
+ if (gad_len < 0)
+ DEC_ERR(-EINVAL, src->h.type, "GAD data invalid (rc=%d)", gad_len);
+ if (gad_len != len)
+ DEC_ERR(-EINVAL, src->h.type, "GAD data with unexpected length: expected %d bytes, got %u",
+ gad_len, len);
+
+ memcpy((void*)gad_raw, data, gad_len);
+ return 0;
+}
+
+/*! Write GAD values with consistent units to raw GAD PDU representation.
+ * \param[out] gad_raw Write to this buffer.
+ * \param[in] gad GAD values to encode.
+ * \returns number of bytes written, or negative on failure.
+ */
+int osmo_gad_enc(union gad_raw *gad_raw, const struct osmo_gad *gad)
+{
+ switch (gad->type) {
+ case GAD_TYPE_ELL_POINT_UNC_CIRCLE:
+ return osmo_gad_enc_ell_point_unc_circle(&gad_raw->ell_point_unc_circle, &gad->ell_point_unc_circle);
+ default:
+ return -ENOTSUP;
+ }
+}
+
+/*! Decode GAD raw PDU to values with consistent units.
+ * \param[out] gad Decoded GAD values are written here.
+ * \param[out] err Returned pointer to error info, dynamically allocated; NULL to not return any.
+ * \param[in] err_ctx Talloc context to allocate err from, if required.
+ * \param[in] raw Raw GAD data in network-byte-order.
+ * \returns 0 on success, negative on error. If returning negative and err was non-NULL, *err is guaranteed to point to
+ * an allocated struct osmo_gad_err.
+ */
+int osmo_gad_dec(struct osmo_gad *gad, struct osmo_gad_err **err, void *err_ctx, const union gad_raw *raw)
+{
+ *gad = (struct osmo_gad){
+ .type = raw->h.type,
+ };
+ switch (raw->h.type) {
+ case GAD_TYPE_ELL_POINT_UNC_CIRCLE:
+ return osmo_gad_dec_ell_point_unc_circle(&gad->ell_point_unc_circle, err, err_ctx,
+ &raw->ell_point_unc_circle);
+ default:
+ DEC_ERR(-ENOTSUP, raw->h.type, "unsupported GAD type");
+ }
+}
+
+/*! Return a human readable representation of a raw GAD PDU.
+ * Convert to GAD values and feed the result to osmo_gad_to_str_buf().
+ * \param[out] buf Buffer to write string to.
+ * \param[in] buflen sizeof(buf).
+ * \param[in] gad Location data.
+ * \returns number of chars that would be written, like snprintf().
+ */
+int osmo_gad_raw_to_str_buf(char *buf, size_t buflen, const union gad_raw *raw)
+{
+ struct osmo_gad gad;
+ if (osmo_gad_dec(&gad, NULL, NULL, raw)) {
+ struct osmo_strbuf sb = { .buf = buf, .len = buflen };
+ OSMO_STRBUF_PRINTF(sb, "invalid");
+ return sb.chars_needed;
+ }
+ return osmo_gad_to_str_buf(buf, buflen, &gad);
+}
+
+/*! Return a human readable representation of a raw GAD PDU.
+ * Convert to GAD values and feed the result to osmo_gad_to_str_buf().
+ * \param[in] ctx Talloc ctx to allocate string buffer from.
+ * \param[in] raw GAD data in network-byte-order.
+ * \returns resulting string, dynamically allocated.
+ */
+char *osmo_gad_raw_to_str_c(void *ctx, const union gad_raw *raw)
+{
+ OSMO_NAME_C_IMPL(ctx, 128, "ERROR", osmo_gad_raw_to_str_buf, raw)
+}
+
+/*! Return a human readable representation of GAD (location estimate) values.
+ * \param[out] buf Buffer to write string to.
+ * \param[in] buflen sizeof(buf).
+ * \param[in] gad Location data.
+ * \returns number of chars that would be written, like snprintf().
+ */
+int osmo_gad_to_str_buf(char *buf, size_t buflen, const struct osmo_gad *gad)
+{
+ struct osmo_strbuf sb = { .buf = buf, .len = buflen };
+
+ if (!gad) {
+ OSMO_STRBUF_PRINTF(sb, "null");
+ return sb.chars_needed;
+ }
+
+ OSMO_STRBUF_PRINTF(sb, "%s{", osmo_gad_type_name(gad->type));
+
+ switch (gad->type) {
+ case GAD_TYPE_ELL_POINT:
+ OSMO_STRBUF_PRINTF(sb, "lat=");
+ OSMO_STRBUF_APPEND(sb, osmo_int_to_float_str_buf, gad->ell_point.lat, 6);
+ OSMO_STRBUF_PRINTF(sb, ",lon=");
+ OSMO_STRBUF_APPEND(sb, osmo_int_to_float_str_buf, gad->ell_point.lon, 6);
+ break;
+
+ case GAD_TYPE_ELL_POINT_UNC_CIRCLE:
+ OSMO_STRBUF_PRINTF(sb, "lat=");
+ OSMO_STRBUF_APPEND(sb, osmo_int_to_float_str_buf, gad->ell_point_unc_circle.lat, 6);
+ OSMO_STRBUF_PRINTF(sb, ",lon=");
+ OSMO_STRBUF_APPEND(sb, osmo_int_to_float_str_buf, gad->ell_point_unc_circle.lon, 6);
+ OSMO_STRBUF_PRINTF(sb, ",unc=");
+ OSMO_STRBUF_APPEND(sb, osmo_int_to_float_str_buf, gad->ell_point_unc_circle.unc, 3);
+ OSMO_STRBUF_PRINTF(sb, "m");
+ break;
+
+ default:
+ OSMO_STRBUF_PRINTF(sb, "to-str-not-implemented");
+ break;
+ }
+
+ OSMO_STRBUF_PRINTF(sb, "}");
+ return sb.chars_needed;
+}
+
+/*! Return a human readable representation of GAD (location estimate) values.
+ * \param[in] ctx Talloc ctx to allocate string buffer from.
+ * \param[in] val Value to convert to float.
+ * \returns resulting string, dynamically allocated.
+ */
+char *osmo_gad_to_str_c(void *ctx, const struct osmo_gad *gad)
+{
+ OSMO_NAME_C_IMPL(ctx, 128, "ERROR", osmo_gad_to_str_buf, gad)
+}
+
+/*! @} */
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-26 05:54:33 +0000