add osmo_float_str_to_int() and osmo_int_to_float_str_*()

This will be useful to handle latitude and longitude numbers for GAD, which is
the location estimate representation used for LCS (Location Services).

The OsmoSMLC VTY user interface will provide floating-point strings like
"23.456" while GAD stores them as micro-degress 23456000. The osmo_gad_to_str*
will also convert latitude and longitude to floating-point string.

There was code review concerns against adding this API, upon which I tried to
use floating point string formats. But I encountered various problems with
accuracy and trailing zeros. For global positioning data (latitude and
longitude), even inaccuracy on the sixth significant decimal digit causes
noticeable positional shift. To achieve sufficient accuracy on the least
significant end, I need to use double instead of float. To remove trailing
zeros, the idea was to use '%.6g' format, but that can cause rounding. '%.6f'
on a double looks ok, but always includes trailing zeros. A test program shows:

 %.6g of ((double)(int32_t)23230100)/1e6 = "23.2301"     <-- good
 %.6g of ((double)(int32_t)42419993)/1e6 = "42.42"       <-- bad rounding
 %.6g of ((double)(int32_t)23230199)/1e6 = "23.2302"     <-- bad rounding

 %.6f of ((double)(int32_t)23230100)/1e6 = "23.230100"   <-- trailing zeros
 %.6f of ((double)(int32_t)42419993)/1e6 = "42.419993"   <-- good
 %.6f of ((double)(int32_t)23230199)/1e6 = "23.230199"   <-- good

It looks like when accepting that there will be trailing zeros, using double
with '%.6f' would work out, but in the end I am not certain enough that there
aren't more hidden rounding / precision glitches. Hence I decided to reinforce
the need to add this API: it is glitch free in sufficient precision for
latitude and longitude data, because it is based on integer arithmetic.

The need for this precision is particular to the (new) OsmoSMLC vty
configuration, where reading and writing back user config must not modify the
values the user entered. Considering to add these functions to osmo-smlc.git,
we might as well add them here to libosmocore utils, and also use them in
osmo_gad_to_str_*() functions.

Change-Id: Ib9aee749cd331712a4dcdadfb6a2dfa4c26da957

2 files changed, 807 insertions, 0 deletions

diff --git a/tests/utils/utils_test.c b/tests/utils/utils_test.c
index 9ff023bf..108bf5a2 100644
--- a/tests/utils/utils_test.c
+++ b/tests/utils/utils_test.c
@@ -34,6 +34,7 @@
 #include <arpa/inet.h>
 #include <errno.h>
 #include <limits.h>
+#include <inttypes.h>
 
 static void hexdump_test(void)
 {
@@ -1443,6 +1444,446 @@ static void osmo_strnchr_test(void)
 	}
 }
 
+struct float_str_to_int_test {
+	unsigned int precision;
+	const char *str;
+	int64_t expect_val;
+	int expect_err;
+};
+struct float_str_to_int_test float_str_to_int_tests[] = {
+	{ 0, "0", 0 },
+	{ 0, "1", 1 },
+	{ 0, "12.345", 12 },
+	{ 0, "+12.345", 12 },
+	{ 0, "-12.345", -12 },
+	{ 0, "0.345", 0 },
+	{ 0, ".345", 0 },
+	{ 0, "-0.345", 0 },
+	{ 0, "-.345", 0 },
+	{ 0, "12.", 12 },
+	{ 0, "-180", -180 },
+	{ 0, "180", 180 },
+	{ 0, "360", 360 },
+	{ 0, "123.4567890123", 123 },
+	{ 0, "123.4567890123456789012345", 123 },
+	{ 0, "9223372036854775807", 9223372036854775807LL },
+	{ 0, "-9223372036854775807", -9223372036854775807LL },
+	{ 0, "-9223372036854775808", .expect_err = -ERANGE },
+	{ 0, "9223372036854775808", .expect_err = -ERANGE },
+	{ 0, "-9223372036854775809", .expect_err = -ERANGE },
+	{ 0, "100000000000000000000", .expect_err = -ERANGE },
+	{ 0, "-100000000000000000000", .expect_err = -ERANGE },
+	{ 0, "999999999999999999999999999.99", .expect_err = -ERANGE },
+	{ 0, "-999999999999999999999999999.99", .expect_err = -ERANGE },
+	{ 0, "1.2.3", .expect_err = -EINVAL },
+	{ 0, "foo", .expect_err = -EINVAL },
+	{ 0, "1.foo", .expect_err = -EINVAL },
+	{ 0, "1.foo", .expect_err = -EINVAL },
+	{ 0, "12.-345", .expect_err = -EINVAL },
+	{ 0, "-12.-345", .expect_err = -EINVAL },
+	{ 0, "12.+345", .expect_err = -EINVAL },
+	{ 0, "+12.+345", .expect_err = -EINVAL },
+	{ 0, "", .expect_err = -EINVAL },
+	{ 0, NULL, .expect_err = -EINVAL },
+
+	{ 1, "0", 0 },
+	{ 1, "1", 10 },
+	{ 1, "12.345", 123 },
+	{ 1, "+12.345", 123 },
+	{ 1, "-12.345", -123 },
+	{ 1, "0.345", 3 },
+	{ 1, ".345", 3 },
+	{ 1, "-0.345", -3 },
+	{ 1, "-.345", -3 },
+	{ 1, "12.", 120 },
+	{ 1, "-180", -1800 },
+	{ 1, "180", 1800 },
+	{ 1, "360", 3600 },
+	{ 1, "123.4567890123", 1234 },
+	{ 1, "123.4567890123456789012345", 1234 },
+	{ 1, "922337203685477580.7", 9223372036854775807LL },
+	{ 1, "-922337203685477580.7", -9223372036854775807LL },
+	{ 1, "-922337203685477580.8", .expect_err = -ERANGE },
+	{ 1, "922337203685477580.8", .expect_err = -ERANGE },
+	{ 1, "-922337203685477580.9", .expect_err = -ERANGE },
+	{ 1, "100000000000000000000", .expect_err = -ERANGE },
+	{ 1, "-100000000000000000000", .expect_err = -ERANGE },
+	{ 1, "999999999999999999999999999.99", .expect_err = -ERANGE },
+	{ 1, "-999999999999999999999999999.99", .expect_err = -ERANGE },
+	{ 1, "1.2.3", .expect_err = -EINVAL },
+	{ 1, "foo", .expect_err = -EINVAL },
+	{ 1, "1.foo", .expect_err = -EINVAL },
+	{ 1, "1.foo", .expect_err = -EINVAL },
+	{ 1, "12.-345", .expect_err = -EINVAL },
+	{ 1, "-12.-345", .expect_err = -EINVAL },
+	{ 1, "12.+345", .expect_err = -EINVAL },
+	{ 1, "+12.+345", .expect_err = -EINVAL },
+	{ 1, "", .expect_err = -EINVAL },
+	{ 1, NULL, .expect_err = -EINVAL },
+
+	{ 6, "0", 0 },
+	{ 6, "1", 1000000 },
+	{ 6, "12.345", 12345000 },
+	{ 6, "+12.345", 12345000 },
+	{ 6, "-12.345", -12345000 },
+	{ 6, "0.345", 345000 },
+	{ 6, ".345", 345000 },
+	{ 6, "-0.345", -345000 },
+	{ 6, "-.345", -345000 },
+	{ 6, "12.", 12000000 },
+	{ 6, "-180", -180000000 },
+	{ 6, "180", 180000000 },
+	{ 6, "360", 360000000 },
+	{ 6, "123.4567890123", 123456789 },
+	{ 6, "123.4567890123456789012345", 123456789 },
+	{ 6, "9223372036854.775807", 9223372036854775807LL },
+	{ 6, "-9223372036854.775807", -9223372036854775807LL },
+	{ 6, "-9223372036854.775808", .expect_err = -ERANGE },
+	{ 6, "9223372036854.775808", .expect_err = -ERANGE },
+	{ 6, "-9223372036854.775809", .expect_err = -ERANGE },
+	{ 6, "100000000000000000000", .expect_err = -ERANGE },
+	{ 6, "-100000000000000000000", .expect_err = -ERANGE },
+	{ 6, "999999999999999999999999999.99", .expect_err = -ERANGE },
+	{ 6, "-999999999999999999999999999.99", .expect_err = -ERANGE },
+	{ 6, "1.2.3", .expect_err = -EINVAL },
+	{ 6, "foo", .expect_err = -EINVAL },
+	{ 6, "1.foo", .expect_err = -EINVAL },
+	{ 6, "1.foo", .expect_err = -EINVAL },
+	{ 6, "12.-345", .expect_err = -EINVAL },
+	{ 6, "-12.-345", .expect_err = -EINVAL },
+	{ 6, "12.+345", .expect_err = -EINVAL },
+	{ 6, "+12.+345", .expect_err = -EINVAL },
+	{ 6, "", .expect_err = -EINVAL },
+	{ 6, NULL, .expect_err = -EINVAL },
+
+	{ 18, "0", 0 },
+	{ 18, "1", 1000000000000000000LL },
+	{ 18, "1.2345", 1234500000000000000LL },
+	{ 18, "+1.2345", 1234500000000000000LL },
+	{ 18, "-1.2345", -1234500000000000000LL },
+	{ 18, "0.345", 345000000000000000LL },
+	{ 18, ".345", 345000000000000000LL },
+	{ 18, "-0.345", -345000000000000000LL },
+	{ 18, "-.345", -345000000000000000LL },
+	{ 18, "2.", 2000000000000000000LL },
+	{ 18, "-8", -8000000000000000000LL },
+	{ 18, "1.234567890123", 1234567890123000000LL },
+	{ 18, "1.234567890123456789012345", 1234567890123456789LL },
+	{ 18, "123.4567890123", .expect_err = -ERANGE },
+	{ 18, "9.223372036854775807", 9223372036854775807LL },
+	{ 18, "-9.223372036854775807", -9223372036854775807LL },
+	{ 18, "-9.223372036854775808", .expect_err = -ERANGE },
+	{ 18, "9.223372036854775808", .expect_err = -ERANGE },
+	{ 18, "-9.223372036854775809", .expect_err = -ERANGE },
+	{ 18, "100000000000000000000", .expect_err = -ERANGE },
+	{ 18, "-100000000000000000000", .expect_err = -ERANGE },
+	{ 18, "999999999999999999999999999.99", .expect_err = -ERANGE },
+	{ 18, "-999999999999999999999999999.99", .expect_err = -ERANGE },
+	{ 18, "1.2.3", .expect_err = -EINVAL },
+	{ 18, "foo", .expect_err = -EINVAL },
+	{ 18, "1.foo", .expect_err = -EINVAL },
+	{ 18, "1.foo", .expect_err = -EINVAL },
+	{ 18, "12.-345", .expect_err = -EINVAL },
+	{ 18, "-12.-345", .expect_err = -EINVAL },
+	{ 18, "12.+345", .expect_err = -EINVAL },
+	{ 18, "+12.+345", .expect_err = -EINVAL },
+	{ 18, "", .expect_err = -EINVAL },
+	{ 18, NULL, .expect_err = -EINVAL },
+
+	{ 19, "0", 0 },
+	{ 19, ".1", 1000000000000000000LL },
+	{ 19, ".12345", 1234500000000000000LL },
+	{ 19, "+.12345", 1234500000000000000LL },
+	{ 19, "-.12345", -1234500000000000000LL },
+	{ 19, "0.0345", 345000000000000000LL },
+	{ 19, ".0345", 345000000000000000LL },
+	{ 19, "-0.0345", -345000000000000000LL },
+	{ 19, "-.0345", -345000000000000000LL },
+	{ 19, ".2", 2000000000000000000LL },
+	{ 19, "-.8", -8000000000000000000LL },
+	{ 19, ".1234567890123", 1234567890123000000LL },
+	{ 19, ".1234567890123456789012345", 1234567890123456789LL },
+	{ 19, "123.4567890123", .expect_err = -ERANGE },
+	{ 19, ".9223372036854775807", 9223372036854775807LL },
+	{ 19, "-.9223372036854775807", -9223372036854775807LL },
+	{ 19, "-.9223372036854775808", .expect_err = -ERANGE },
+	{ 19, ".9223372036854775808", .expect_err = -ERANGE },
+	{ 19, "-.9223372036854775809", .expect_err = -ERANGE },
+	{ 19, "100000000000000000000", .expect_err = -ERANGE },
+	{ 19, "-100000000000000000000", .expect_err = -ERANGE },
+	{ 19, "999999999999999999999999999.99", .expect_err = -ERANGE },
+	{ 19, "-999999999999999999999999999.99", .expect_err = -ERANGE },
+	{ 19, "1.2.3", .expect_err = -EINVAL },
+	{ 19, "foo", .expect_err = -EINVAL },
+	{ 19, "1.foo", .expect_err = -EINVAL },
+	{ 19, "1.foo", .expect_err = -EINVAL },
+	{ 19, "12.-345", .expect_err = -EINVAL },
+	{ 19, "-12.-345", .expect_err = -EINVAL },
+	{ 19, "12.+345", .expect_err = -EINVAL },
+	{ 19, "+12.+345", .expect_err = -EINVAL },
+	{ 19, "", .expect_err = -EINVAL },
+	{ 19, NULL, .expect_err = -EINVAL },
+
+	{ 20, "0", 0 },
+	{ 20, ".01", 1000000000000000000LL },
+	{ 20, ".012345", 1234500000000000000LL },
+	{ 20, "+.012345", 1234500000000000000LL },
+	{ 20, "-.012345", -1234500000000000000LL },
+	{ 20, "0.00345", 345000000000000000LL },
+	{ 20, ".00345", 345000000000000000LL },
+	{ 20, "-0.00345", -345000000000000000LL },
+	{ 20, "-.00345", -345000000000000000LL },
+	{ 20, ".02", 2000000000000000000LL },
+	{ 20, "-.08", -8000000000000000000LL },
+	{ 20, ".01234567890123", 1234567890123000000LL },
+	{ 20, ".01234567890123456789012345", 1234567890123456789LL },
+	{ 20, "12.34567890123", .expect_err = -ERANGE },
+	{ 20, ".09223372036854775807", 9223372036854775807LL },
+	{ 20, "-.09223372036854775807", -9223372036854775807LL },
+	{ 20, "-.09223372036854775808", .expect_err = -ERANGE },
+	{ 20, ".09223372036854775808", .expect_err = -ERANGE },
+	{ 20, "-.09223372036854775809", .expect_err = -ERANGE },
+	{ 20, ".1", .expect_err = -ERANGE },
+	{ 20, "-.1", .expect_err = -ERANGE },
+	{ 20, "999999999999999999999999999.99", .expect_err = -ERANGE },
+	{ 20, "-999999999999999999999999999.99", .expect_err = -ERANGE },
+	{ 20, "1.2.3", .expect_err = -EINVAL },
+	{ 20, "foo", .expect_err = -EINVAL },
+	{ 20, "1.foo", .expect_err = -EINVAL },
+	{ 20, "1.foo", .expect_err = -EINVAL },
+	{ 20, "12.-345", .expect_err = -EINVAL },
+	{ 20, "-12.-345", .expect_err = -EINVAL },
+	{ 20, "12.+345", .expect_err = -EINVAL },
+	{ 20, "+12.+345", .expect_err = -EINVAL },
+	{ 20, "", .expect_err = -EINVAL },
+	{ 20, NULL, .expect_err = -EINVAL },
+
+	{ 25, "0", 0 },
+	{ 25, ".0000001", 1000000000000000000LL },
+	{ 25, ".00000012345", 1234500000000000000LL },
+	{ 25, "+.00000012345", 1234500000000000000LL },
+	{ 25, "-.00000012345", -1234500000000000000LL },
+	{ 25, "0.0000000345", 345000000000000000LL },
+	{ 25, ".0000000345", 345000000000000000LL },
+	{ 25, "-0.0000000345", -345000000000000000LL },
+	{ 25, "-.0000000345", -345000000000000000LL },
+	{ 25, ".0000002", 2000000000000000000LL },
+	{ 25, "-.0000008", -8000000000000000000LL },
+	{ 25, ".0000001234567890123", 1234567890123000000LL },
+	{ 25, ".0000001234567890123456789012345", 1234567890123456789LL },
+	{ 25, ".0001234567890123", .expect_err = -ERANGE },
+	{ 25, ".0000009223372036854775807", 9223372036854775807LL },
+	{ 25, "-.0000009223372036854775807", -9223372036854775807LL },
+	{ 25, "-.0000009223372036854775808", .expect_err = -ERANGE },
+	{ 25, ".0000009223372036854775808", .expect_err = -ERANGE },
+	{ 25, "-.0000009223372036854775809", .expect_err = -ERANGE },
+	{ 25, ".000001", .expect_err = -ERANGE },
+	{ 25, "-.000001", .expect_err = -ERANGE },
+	{ 25, "999999999999999999999999999.99", .expect_err = -ERANGE },
+	{ 25, "-999999999999999999999999999.99", .expect_err = -ERANGE },
+	{ 25, "1.2.3", .expect_err = -EINVAL },
+	{ 25, "foo", .expect_err = -EINVAL },
+	{ 25, "1.foo", .expect_err = -EINVAL },
+	{ 25, "1.foo", .expect_err = -EINVAL },
+	{ 25, "12.-345", .expect_err = -EINVAL },
+	{ 25, "-12.-345", .expect_err = -EINVAL },
+	{ 25, "12.+345", .expect_err = -EINVAL },
+	{ 25, "+12.+345", .expect_err = -EINVAL },
+	{ 25, "", .expect_err = -EINVAL },
+	{ 25, NULL, .expect_err = -EINVAL },
+};
+const char *errno_str(int rc)
+{
+	if (rc == -EINVAL)
+		return "=-EINVAL";
+	if (rc == -ERANGE)
+		return "=-ERANGE";
+	return "";
+}
+void test_float_str_to_int()
+{
+	const struct float_str_to_int_test *t;
+	printf("--- %s\n", __func__);
+	for (t = float_str_to_int_tests; (t - float_str_to_int_tests) < ARRAY_SIZE(float_str_to_int_tests); t++) {
+		int rc;
+		int64_t val;
+		rc = osmo_float_str_to_int(&val, t->str, t->precision);
+		printf("osmo_float_str_to_int(%s, %u) -> rc=%d%s val=%" PRId64 "\n",
+		       osmo_quote_str(t->str, -1), t->precision, rc, errno_str(rc), val);
+
+		if (rc != t->expect_err)
+			printf("  ERROR: expected rc=%d%s\n", t->expect_err, errno_str(t->expect_err));
+		if (val != t->expect_val)
+			printf("  ERROR: expected val=%" PRId64 "\n", t->expect_val);
+		if (rc != t->expect_err||val != t->expect_val)
+		exit(0);
+	}
+}
+
+struct int_to_float_str_test {
+	unsigned int precision;
+	int64_t val;
+	const char *expect_str;
+};
+struct int_to_float_str_test int_to_float_str_tests[] = {
+	{ 0, 0, "0" },
+	{ 0, 1, "1" },
+	{ 0, 1000000, "1000000" },
+	{ 0, -1000000, "-1000000" },
+	{ 0, 1000001, "1000001" },
+	{ 0, -1000001, "-1000001" },
+	{ 0, 1000100, "1000100" },
+	{ 0, -1010000, "-1010000" },
+	{ 0, 1100000, "1100000" },
+	{ 0, 10000000, "10000000" },
+	{ 0, -10000000, "-10000000" },
+	{ 0, 100000000, "100000000" },
+	{ 0, -100000000, "-100000000" },
+	{ 0, 9223372036854775807, "9223372036854775807" },
+	{ 0, -9223372036854775807, "-9223372036854775807" },
+	{ 0, INT64_MIN, "-ERR" },
+
+	{ 1, 0, "0" },
+	{ 1, 1, "0.1" },
+	{ 1, 1000000, "100000" },
+	{ 1, -1000000, "-100000" },
+	{ 1, 1000001, "100000.1" },
+	{ 1, -1000001, "-100000.1" },
+	{ 1, 1000100, "100010" },
+	{ 1, -1010000, "-101000" },
+	{ 1, 1100000, "110000" },
+	{ 1, 10000000, "1000000" },
+	{ 1, -10000000, "-1000000" },
+	{ 1, 100000000, "10000000" },
+	{ 1, -100000000, "-10000000" },
+	{ 1, 9223372036854775807, "922337203685477580.7" },
+	{ 1, -9223372036854775807, "-922337203685477580.7" },
+	{ 1, INT64_MIN, "-ERR" },
+
+	{ 3, 0, "0" },
+	{ 3, 1, "0.001" },
+	{ 3, 1000000, "1000" },
+	{ 3, -1000000, "-1000" },
+	{ 3, 1000001, "1000.001" },
+	{ 3, -1000001, "-1000.001" },
+	{ 3, 1000100, "1000.1" },
+	{ 3, -1010000, "-1010" },
+	{ 3, 1100000, "1100" },
+	{ 3, 10000000, "10000" },
+	{ 3, -10000000, "-10000" },
+	{ 3, 100000000, "100000" },
+	{ 3, -100000000, "-100000" },
+	{ 3, 9223372036854775807, "9223372036854775.807" },
+	{ 3, -9223372036854775807, "-9223372036854775.807" },
+	{ 3, INT64_MIN, "-ERR" },
+
+	{ 6, 0, "0" },
+	{ 6, 1, "0.000001" },
+	{ 6, 1000000, "1" },
+	{ 6, -1000000, "-1" },
+	{ 6, 1000001, "1.000001" },
+	{ 6, -1000001, "-1.000001" },
+	{ 6, 1000100, "1.0001" },
+	{ 6, -1010000, "-1.01" },
+	{ 6, 1100000, "1.1" },
+	{ 6, 10000000, "10" },
+	{ 6, -10000000, "-10" },
+	{ 6, 100000000, "100" },
+	{ 6, -100000000, "-100" },
+	{ 6, 9223372036854775807, "9223372036854.775807" },
+	{ 6, -9223372036854775807, "-9223372036854.775807" },
+	{ 6, INT64_MIN, "-ERR" },
+
+	{ 17, 0, "0" },
+	{ 17, 1, "0.00000000000000001" },
+	{ 17, 1000000, "0.00000000001" },
+	{ 17, -1000000, "-0.00000000001" },
+	{ 17, 1000001, "0.00000000001000001" },
+	{ 17, -1000001, "-0.00000000001000001" },
+	{ 17, 1000100, "0.000000000010001" },
+	{ 17, -1010000, "-0.0000000000101" },
+	{ 17, 1100000, "0.000000000011" },
+	{ 17, 10000000, "0.0000000001" },
+	{ 17, -10000000, "-0.0000000001" },
+	{ 17, 100000000, "0.000000001" },
+	{ 17, -100000000, "-0.000000001" },
+	{ 17, 9223372036854775807, "92.23372036854775807" },
+	{ 17, -9223372036854775807, "-92.23372036854775807" },
+	{ 17, INT64_MIN, "-ERR" },
+
+	{ 18, 0, "0" },
+	{ 18, 1, "0.000000000000000001" },
+	{ 18, 1000000, "0.000000000001" },
+	{ 18, -1000000, "-0.000000000001" },
+	{ 18, 1000001, "0.000000000001000001" },
+	{ 18, -1000001, "-0.000000000001000001" },
+	{ 18, 1000100, "0.0000000000010001" },
+	{ 18, -1010000, "-0.00000000000101" },
+	{ 18, 1100000, "0.0000000000011" },
+	{ 18, 10000000, "0.00000000001" },
+	{ 18, -10000000, "-0.00000000001" },
+	{ 18, 100000000, "0.0000000001" },
+	{ 18, -100000000, "-0.0000000001" },
+	{ 18, 9223372036854775807, "9.223372036854775807" },
+	{ 18, -9223372036854775807, "-9.223372036854775807" },
+	{ 18, INT64_MIN, "-ERR" },
+
+	{ 19, 0, "0" },
+	{ 19, 1, "0.0000000000000000001" },
+	{ 19, 1000000, "0.0000000000001" },
+	{ 19, -1000000, "-0.0000000000001" },
+	{ 19, 1000001, "0.0000000000001000001" },
+	{ 19, -1000001, "-0.0000000000001000001" },
+	{ 19, 1000100, "0.00000000000010001" },
+	{ 19, -1010000, "-0.000000000000101" },
+	{ 19, 1100000, "0.00000000000011" },
+	{ 19, 10000000, "0.000000000001" },
+	{ 19, -10000000, "-0.000000000001" },
+	{ 19, 100000000, "0.00000000001" },
+	{ 19, -100000000, "-0.00000000001" },
+	{ 19, 9223372036854775807, "0.9223372036854775807" },
+	{ 19, -9223372036854775807, "-0.9223372036854775807" },
+	{ 19, INT64_MIN, "-ERR" },
+
+	{ 23, 0, "0" },
+	{ 23, 1, "0.00000000000000000000001" },
+	{ 23, 1000000, "0.00000000000000001" },
+	{ 23, -1000000, "-0.00000000000000001" },
+	{ 23, 1000001, "0.00000000000000001000001" },
+	{ 23, -1000001, "-0.00000000000000001000001" },
+	{ 23, 1000100, "0.000000000000000010001" },
+	{ 23, -1010000, "-0.0000000000000000101" },
+	{ 23, 1100000, "0.000000000000000011" },
+	{ 23, 10000000, "0.0000000000000001" },
+	{ 23, -10000000, "-0.0000000000000001" },
+	{ 23, 100000000, "0.000000000000001" },
+	{ 23, -100000000, "-0.000000000000001" },
+	{ 23, 9223372036854775807, "0.00009223372036854775807" },
+	{ 23, -9223372036854775807, "-0.00009223372036854775807" },
+	{ 23, INT64_MIN, "-ERR" },
+};
+void test_int_to_float_str()
+{
+	const struct int_to_float_str_test *t;
+	printf("--- %s\n", __func__);
+	for (t = int_to_float_str_tests;
+	     (t - int_to_float_str_tests) < ARRAY_SIZE(int_to_float_str_tests);
+	     t++) {
+		char buf[128];
+		int rc;
+		rc = osmo_int_to_float_str_buf(buf, sizeof(buf), t->val, t->precision);
+		printf("osmo_int_to_float_str_buf(%" PRId64 ", %u) -> rc=%d str=%s\n", t->val, t->precision, rc,
+		       osmo_quote_str(buf, -1));
+
+		if (rc != strlen(buf))
+			printf("  ERROR: expected rc=%zu\n", strlen(buf));
+		if (strcmp(buf, t->expect_str))
+			printf("  ERROR: expected str=%s\n", osmo_quote_str(t->expect_str, -1));
+		if (rc != strlen(buf) || strcmp(buf, t->expect_str))
+			exit(0);
+	}
+}
+
 int main(int argc, char **argv)
 {
 	static const struct log_info log_info = {};
@@ -1468,5 +1909,7 @@ int main(int argc, char **argv)
 	name_c_impl_test();
 	osmo_print_n_test();
 	osmo_strnchr_test();
+	test_float_str_to_int();
+	test_int_to_float_str();
 	return 0;
 }
diff --git a/tests/utils/utils_test.ok b/tests/utils/utils_test.ok
index f1b07fa8..0c71b8fa 100644
--- a/tests/utils/utils_test.ok
+++ b/tests/utils/utils_test.ok
@@ -505,3 +505,367 @@ osmo_strnchr("foo=bar", 3, '=') -> -1
 osmo_strnchr("foo=bar", 0, '=') -> -1
 osmo_strnchr("foo", 9, '=') -> -1
 osmo_strnchr("foo", 9, '\0') -> 3
+--- test_float_str_to_int
+osmo_float_str_to_int("0", 0) -> rc=0 val=0
+osmo_float_str_to_int("1", 0) -> rc=0 val=1
+osmo_float_str_to_int("12.345", 0) -> rc=0 val=12
+osmo_float_str_to_int("+12.345", 0) -> rc=0 val=12
+osmo_float_str_to_int("-12.345", 0) -> rc=0 val=-12
+osmo_float_str_to_int("0.345", 0) -> rc=0 val=0
+osmo_float_str_to_int(".345", 0) -> rc=0 val=0
+osmo_float_str_to_int("-0.345", 0) -> rc=0 val=0
+osmo_float_str_to_int("-.345", 0) -> rc=0 val=0
+osmo_float_str_to_int("12.", 0) -> rc=0 val=12
+osmo_float_str_to_int("-180", 0) -> rc=0 val=-180
+osmo_float_str_to_int("180", 0) -> rc=0 val=180
+osmo_float_str_to_int("360", 0) -> rc=0 val=360
+osmo_float_str_to_int("123.4567890123", 0) -> rc=0 val=123
+osmo_float_str_to_int("123.4567890123456789012345", 0) -> rc=0 val=123
+osmo_float_str_to_int("9223372036854775807", 0) -> rc=0 val=9223372036854775807
+osmo_float_str_to_int("-9223372036854775807", 0) -> rc=0 val=-9223372036854775807
+osmo_float_str_to_int("-9223372036854775808", 0) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("9223372036854775808", 0) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("-9223372036854775809", 0) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("100000000000000000000", 0) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("-100000000000000000000", 0) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("999999999999999999999999999.99", 0) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("-999999999999999999999999999.99", 0) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("1.2.3", 0) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("foo", 0) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("1.foo", 0) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("1.foo", 0) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("12.-345", 0) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("-12.-345", 0) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("12.+345", 0) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("+12.+345", 0) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("", 0) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int(NULL, 0) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("0", 1) -> rc=0 val=0
+osmo_float_str_to_int("1", 1) -> rc=0 val=10
+osmo_float_str_to_int("12.345", 1) -> rc=0 val=123
+osmo_float_str_to_int("+12.345", 1) -> rc=0 val=123
+osmo_float_str_to_int("-12.345", 1) -> rc=0 val=-123
+osmo_float_str_to_int("0.345", 1) -> rc=0 val=3
+osmo_float_str_to_int(".345", 1) -> rc=0 val=3
+osmo_float_str_to_int("-0.345", 1) -> rc=0 val=-3
+osmo_float_str_to_int("-.345", 1) -> rc=0 val=-3
+osmo_float_str_to_int("12.", 1) -> rc=0 val=120
+osmo_float_str_to_int("-180", 1) -> rc=0 val=-1800
+osmo_float_str_to_int("180", 1) -> rc=0 val=1800
+osmo_float_str_to_int("360", 1) -> rc=0 val=3600
+osmo_float_str_to_int("123.4567890123", 1) -> rc=0 val=1234
+osmo_float_str_to_int("123.4567890123456789012345", 1) -> rc=0 val=1234
+osmo_float_str_to_int("922337203685477580.7", 1) -> rc=0 val=9223372036854775807
+osmo_float_str_to_int("-922337203685477580.7", 1) -> rc=0 val=-9223372036854775807
+osmo_float_str_to_int("-922337203685477580.8", 1) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("922337203685477580.8", 1) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("-922337203685477580.9", 1) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("100000000000000000000", 1) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("-100000000000000000000", 1) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("999999999999999999999999999.99", 1) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("-999999999999999999999999999.99", 1) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("1.2.3", 1) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("foo", 1) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("1.foo", 1) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("1.foo", 1) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("12.-345", 1) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("-12.-345", 1) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("12.+345", 1) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("+12.+345", 1) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("", 1) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int(NULL, 1) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("0", 6) -> rc=0 val=0
+osmo_float_str_to_int("1", 6) -> rc=0 val=1000000
+osmo_float_str_to_int("12.345", 6) -> rc=0 val=12345000
+osmo_float_str_to_int("+12.345", 6) -> rc=0 val=12345000
+osmo_float_str_to_int("-12.345", 6) -> rc=0 val=-12345000
+osmo_float_str_to_int("0.345", 6) -> rc=0 val=345000
+osmo_float_str_to_int(".345", 6) -> rc=0 val=345000
+osmo_float_str_to_int("-0.345", 6) -> rc=0 val=-345000
+osmo_float_str_to_int("-.345", 6) -> rc=0 val=-345000
+osmo_float_str_to_int("12.", 6) -> rc=0 val=12000000
+osmo_float_str_to_int("-180", 6) -> rc=0 val=-180000000
+osmo_float_str_to_int("180", 6) -> rc=0 val=180000000
+osmo_float_str_to_int("360", 6) -> rc=0 val=360000000
+osmo_float_str_to_int("123.4567890123", 6) -> rc=0 val=123456789
+osmo_float_str_to_int("123.4567890123456789012345", 6) -> rc=0 val=123456789
+osmo_float_str_to_int("9223372036854.775807", 6) -> rc=0 val=9223372036854775807
+osmo_float_str_to_int("-9223372036854.775807", 6) -> rc=0 val=-9223372036854775807
+osmo_float_str_to_int("-9223372036854.775808", 6) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("9223372036854.775808", 6) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("-9223372036854.775809", 6) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("100000000000000000000", 6) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("-100000000000000000000", 6) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("999999999999999999999999999.99", 6) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("-999999999999999999999999999.99", 6) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("1.2.3", 6) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("foo", 6) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("1.foo", 6) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("1.foo", 6) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("12.-345", 6) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("-12.-345", 6) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("12.+345", 6) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("+12.+345", 6) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("", 6) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int(NULL, 6) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("0", 18) -> rc=0 val=0
+osmo_float_str_to_int("1", 18) -> rc=0 val=1000000000000000000
+osmo_float_str_to_int("1.2345", 18) -> rc=0 val=1234500000000000000
+osmo_float_str_to_int("+1.2345", 18) -> rc=0 val=1234500000000000000
+osmo_float_str_to_int("-1.2345", 18) -> rc=0 val=-1234500000000000000
+osmo_float_str_to_int("0.345", 18) -> rc=0 val=345000000000000000
+osmo_float_str_to_int(".345", 18) -> rc=0 val=345000000000000000
+osmo_float_str_to_int("-0.345", 18) -> rc=0 val=-345000000000000000
+osmo_float_str_to_int("-.345", 18) -> rc=0 val=-345000000000000000
+osmo_float_str_to_int("2.", 18) -> rc=0 val=2000000000000000000
+osmo_float_str_to_int("-8", 18) -> rc=0 val=-8000000000000000000
+osmo_float_str_to_int("1.234567890123", 18) -> rc=0 val=1234567890123000000
+osmo_float_str_to_int("1.234567890123456789012345", 18) -> rc=0 val=1234567890123456789
+osmo_float_str_to_int("123.4567890123", 18) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("9.223372036854775807", 18) -> rc=0 val=9223372036854775807
+osmo_float_str_to_int("-9.223372036854775807", 18) -> rc=0 val=-9223372036854775807
+osmo_float_str_to_int("-9.223372036854775808", 18) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("9.223372036854775808", 18) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("-9.223372036854775809", 18) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("100000000000000000000", 18) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("-100000000000000000000", 18) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("999999999999999999999999999.99", 18) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("-999999999999999999999999999.99", 18) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("1.2.3", 18) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("foo", 18) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("1.foo", 18) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("1.foo", 18) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("12.-345", 18) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("-12.-345", 18) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("12.+345", 18) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("+12.+345", 18) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("", 18) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int(NULL, 18) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("0", 19) -> rc=0 val=0
+osmo_float_str_to_int(".1", 19) -> rc=0 val=1000000000000000000
+osmo_float_str_to_int(".12345", 19) -> rc=0 val=1234500000000000000
+osmo_float_str_to_int("+.12345", 19) -> rc=0 val=1234500000000000000
+osmo_float_str_to_int("-.12345", 19) -> rc=0 val=-1234500000000000000
+osmo_float_str_to_int("0.0345", 19) -> rc=0 val=345000000000000000
+osmo_float_str_to_int(".0345", 19) -> rc=0 val=345000000000000000
+osmo_float_str_to_int("-0.0345", 19) -> rc=0 val=-345000000000000000
+osmo_float_str_to_int("-.0345", 19) -> rc=0 val=-345000000000000000
+osmo_float_str_to_int(".2", 19) -> rc=0 val=2000000000000000000
+osmo_float_str_to_int("-.8", 19) -> rc=0 val=-8000000000000000000
+osmo_float_str_to_int(".1234567890123", 19) -> rc=0 val=1234567890123000000
+osmo_float_str_to_int(".1234567890123456789012345", 19) -> rc=0 val=1234567890123456789
+osmo_float_str_to_int("123.4567890123", 19) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int(".9223372036854775807", 19) -> rc=0 val=9223372036854775807
+osmo_float_str_to_int("-.9223372036854775807", 19) -> rc=0 val=-9223372036854775807
+osmo_float_str_to_int("-.9223372036854775808", 19) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int(".9223372036854775808", 19) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("-.9223372036854775809", 19) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("100000000000000000000", 19) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("-100000000000000000000", 19) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("999999999999999999999999999.99", 19) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("-999999999999999999999999999.99", 19) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("1.2.3", 19) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("foo", 19) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("1.foo", 19) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("1.foo", 19) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("12.-345", 19) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("-12.-345", 19) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("12.+345", 19) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("+12.+345", 19) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("", 19) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int(NULL, 19) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("0", 20) -> rc=0 val=0
+osmo_float_str_to_int(".01", 20) -> rc=0 val=1000000000000000000
+osmo_float_str_to_int(".012345", 20) -> rc=0 val=1234500000000000000
+osmo_float_str_to_int("+.012345", 20) -> rc=0 val=1234500000000000000
+osmo_float_str_to_int("-.012345", 20) -> rc=0 val=-1234500000000000000
+osmo_float_str_to_int("0.00345", 20) -> rc=0 val=345000000000000000
+osmo_float_str_to_int(".00345", 20) -> rc=0 val=345000000000000000
+osmo_float_str_to_int("-0.00345", 20) -> rc=0 val=-345000000000000000
+osmo_float_str_to_int("-.00345", 20) -> rc=0 val=-345000000000000000
+osmo_float_str_to_int(".02", 20) -> rc=0 val=2000000000000000000
+osmo_float_str_to_int("-.08", 20) -> rc=0 val=-8000000000000000000
+osmo_float_str_to_int(".01234567890123", 20) -> rc=0 val=1234567890123000000
+osmo_float_str_to_int(".01234567890123456789012345", 20) -> rc=0 val=1234567890123456789
+osmo_float_str_to_int("12.34567890123", 20) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int(".09223372036854775807", 20) -> rc=0 val=9223372036854775807
+osmo_float_str_to_int("-.09223372036854775807", 20) -> rc=0 val=-9223372036854775807
+osmo_float_str_to_int("-.09223372036854775808", 20) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int(".09223372036854775808", 20) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("-.09223372036854775809", 20) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int(".1", 20) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("-.1", 20) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("999999999999999999999999999.99", 20) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("-999999999999999999999999999.99", 20) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("1.2.3", 20) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("foo", 20) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("1.foo", 20) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("1.foo", 20) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("12.-345", 20) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("-12.-345", 20) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("12.+345", 20) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("+12.+345", 20) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("", 20) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int(NULL, 20) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("0", 25) -> rc=0 val=0
+osmo_float_str_to_int(".0000001", 25) -> rc=0 val=1000000000000000000
+osmo_float_str_to_int(".00000012345", 25) -> rc=0 val=1234500000000000000
+osmo_float_str_to_int("+.00000012345", 25) -> rc=0 val=1234500000000000000
+osmo_float_str_to_int("-.00000012345", 25) -> rc=0 val=-1234500000000000000
+osmo_float_str_to_int("0.0000000345", 25) -> rc=0 val=345000000000000000
+osmo_float_str_to_int(".0000000345", 25) -> rc=0 val=345000000000000000
+osmo_float_str_to_int("-0.0000000345", 25) -> rc=0 val=-345000000000000000
+osmo_float_str_to_int("-.0000000345", 25) -> rc=0 val=-345000000000000000
+osmo_float_str_to_int(".0000002", 25) -> rc=0 val=2000000000000000000
+osmo_float_str_to_int("-.0000008", 25) -> rc=0 val=-8000000000000000000
+osmo_float_str_to_int(".0000001234567890123", 25) -> rc=0 val=1234567890123000000
+osmo_float_str_to_int(".0000001234567890123456789012345", 25) -> rc=0 val=1234567890123456789
+osmo_float_str_to_int(".0001234567890123", 25) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int(".0000009223372036854775807", 25) -> rc=0 val=9223372036854775807
+osmo_float_str_to_int("-.0000009223372036854775807", 25) -> rc=0 val=-9223372036854775807
+osmo_float_str_to_int("-.0000009223372036854775808", 25) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int(".0000009223372036854775808", 25) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("-.0000009223372036854775809", 25) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int(".000001", 25) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("-.000001", 25) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("999999999999999999999999999.99", 25) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("-999999999999999999999999999.99", 25) -> rc=-34=-ERANGE val=0
+osmo_float_str_to_int("1.2.3", 25) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("foo", 25) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("1.foo", 25) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("1.foo", 25) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("12.-345", 25) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("-12.-345", 25) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("12.+345", 25) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("+12.+345", 25) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int("", 25) -> rc=-22=-EINVAL val=0
+osmo_float_str_to_int(NULL, 25) -> rc=-22=-EINVAL val=0
+--- test_int_to_float_str
+osmo_int_to_float_str_buf(0, 0) -> rc=1 str="0"
+osmo_int_to_float_str_buf(1, 0) -> rc=1 str="1"
+osmo_int_to_float_str_buf(1000000, 0) -> rc=7 str="1000000"
+osmo_int_to_float_str_buf(-1000000, 0) -> rc=8 str="-1000000"
+osmo_int_to_float_str_buf(1000001, 0) -> rc=7 str="1000001"
+osmo_int_to_float_str_buf(-1000001, 0) -> rc=8 str="-1000001"
+osmo_int_to_float_str_buf(1000100, 0) -> rc=7 str="1000100"
+osmo_int_to_float_str_buf(-1010000, 0) -> rc=8 str="-1010000"
+osmo_int_to_float_str_buf(1100000, 0) -> rc=7 str="1100000"
+osmo_int_to_float_str_buf(10000000, 0) -> rc=8 str="10000000"
+osmo_int_to_float_str_buf(-10000000, 0) -> rc=9 str="-10000000"
+osmo_int_to_float_str_buf(100000000, 0) -> rc=9 str="100000000"
+osmo_int_to_float_str_buf(-100000000, 0) -> rc=10 str="-100000000"
+osmo_int_to_float_str_buf(9223372036854775807, 0) -> rc=19 str="9223372036854775807"
+osmo_int_to_float_str_buf(-9223372036854775807, 0) -> rc=20 str="-9223372036854775807"
+osmo_int_to_float_str_buf(-9223372036854775808, 0) -> rc=4 str="-ERR"
+osmo_int_to_float_str_buf(0, 1) -> rc=1 str="0"
+osmo_int_to_float_str_buf(1, 1) -> rc=3 str="0.1"
+osmo_int_to_float_str_buf(1000000, 1) -> rc=6 str="100000"
+osmo_int_to_float_str_buf(-1000000, 1) -> rc=7 str="-100000"
+osmo_int_to_float_str_buf(1000001, 1) -> rc=8 str="100000.1"
+osmo_int_to_float_str_buf(-1000001, 1) -> rc=9 str="-100000.1"
+osmo_int_to_float_str_buf(1000100, 1) -> rc=6 str="100010"
+osmo_int_to_float_str_buf(-1010000, 1) -> rc=7 str="-101000"
+osmo_int_to_float_str_buf(1100000, 1) -> rc=6 str="110000"
+osmo_int_to_float_str_buf(10000000, 1) -> rc=7 str="1000000"
+osmo_int_to_float_str_buf(-10000000, 1) -> rc=8 str="-1000000"
+osmo_int_to_float_str_buf(100000000, 1) -> rc=8 str="10000000"
+osmo_int_to_float_str_buf(-100000000, 1) -> rc=9 str="-10000000"
+osmo_int_to_float_str_buf(9223372036854775807, 1) -> rc=20 str="922337203685477580.7"
+osmo_int_to_float_str_buf(-9223372036854775807, 1) -> rc=21 str="-922337203685477580.7"
+osmo_int_to_float_str_buf(-9223372036854775808, 1) -> rc=4 str="-ERR"
+osmo_int_to_float_str_buf(0, 3) -> rc=1 str="0"
+osmo_int_to_float_str_buf(1, 3) -> rc=5 str="0.001"
+osmo_int_to_float_str_buf(1000000, 3) -> rc=4 str="1000"
+osmo_int_to_float_str_buf(-1000000, 3) -> rc=5 str="-1000"
+osmo_int_to_float_str_buf(1000001, 3) -> rc=8 str="1000.001"
+osmo_int_to_float_str_buf(-1000001, 3) -> rc=9 str="-1000.001"
+osmo_int_to_float_str_buf(1000100, 3) -> rc=6 str="1000.1"
+osmo_int_to_float_str_buf(-1010000, 3) -> rc=5 str="-1010"
+osmo_int_to_float_str_buf(1100000, 3) -> rc=4 str="1100"
+osmo_int_to_float_str_buf(10000000, 3) -> rc=5 str="10000"
+osmo_int_to_float_str_buf(-10000000, 3) -> rc=6 str="-10000"
+osmo_int_to_float_str_buf(100000000, 3) -> rc=6 str="100000"
+osmo_int_to_float_str_buf(-100000000, 3) -> rc=7 str="-100000"
+osmo_int_to_float_str_buf(9223372036854775807, 3) -> rc=20 str="9223372036854775.807"
+osmo_int_to_float_str_buf(-9223372036854775807, 3) -> rc=21 str="-9223372036854775.807"
+osmo_int_to_float_str_buf(-9223372036854775808, 3) -> rc=4 str="-ERR"
+osmo_int_to_float_str_buf(0, 6) -> rc=1 str="0"
+osmo_int_to_float_str_buf(1, 6) -> rc=8 str="0.000001"
+osmo_int_to_float_str_buf(1000000, 6) -> rc=1 str="1"
+osmo_int_to_float_str_buf(-1000000, 6) -> rc=2 str="-1"
+osmo_int_to_float_str_buf(1000001, 6) -> rc=8 str="1.000001"
+osmo_int_to_float_str_buf(-1000001, 6) -> rc=9 str="-1.000001"
+osmo_int_to_float_str_buf(1000100, 6) -> rc=6 str="1.0001"
+osmo_int_to_float_str_buf(-1010000, 6) -> rc=5 str="-1.01"
+osmo_int_to_float_str_buf(1100000, 6) -> rc=3 str="1.1"
+osmo_int_to_float_str_buf(10000000, 6) -> rc=2 str="10"
+osmo_int_to_float_str_buf(-10000000, 6) -> rc=3 str="-10"
+osmo_int_to_float_str_buf(100000000, 6) -> rc=3 str="100"
+osmo_int_to_float_str_buf(-100000000, 6) -> rc=4 str="-100"
+osmo_int_to_float_str_buf(9223372036854775807, 6) -> rc=20 str="9223372036854.775807"
+osmo_int_to_float_str_buf(-9223372036854775807, 6) -> rc=21 str="-9223372036854.775807"
+osmo_int_to_float_str_buf(-9223372036854775808, 6) -> rc=4 str="-ERR"
+osmo_int_to_float_str_buf(0, 17) -> rc=1 str="0"
+osmo_int_to_float_str_buf(1, 17) -> rc=19 str="0.00000000000000001"
+osmo_int_to_float_str_buf(1000000, 17) -> rc=13 str="0.00000000001"
+osmo_int_to_float_str_buf(-1000000, 17) -> rc=14 str="-0.00000000001"
+osmo_int_to_float_str_buf(1000001, 17) -> rc=19 str="0.00000000001000001"
+osmo_int_to_float_str_buf(-1000001, 17) -> rc=20 str="-0.00000000001000001"
+osmo_int_to_float_str_buf(1000100, 17) -> rc=17 str="0.000000000010001"
+osmo_int_to_float_str_buf(-1010000, 17) -> rc=16 str="-0.0000000000101"
+osmo_int_to_float_str_buf(1100000, 17) -> rc=14 str="0.000000000011"
+osmo_int_to_float_str_buf(10000000, 17) -> rc=12 str="0.0000000001"
+osmo_int_to_float_str_buf(-10000000, 17) -> rc=13 str="-0.0000000001"
+osmo_int_to_float_str_buf(100000000, 17) -> rc=11 str="0.000000001"
+osmo_int_to_float_str_buf(-100000000, 17) -> rc=12 str="-0.000000001"
+osmo_int_to_float_str_buf(9223372036854775807, 17) -> rc=20 str="92.23372036854775807"
+osmo_int_to_float_str_buf(-9223372036854775807, 17) -> rc=21 str="-92.23372036854775807"
+osmo_int_to_float_str_buf(-9223372036854775808, 17) -> rc=4 str="-ERR"
+osmo_int_to_float_str_buf(0, 18) -> rc=1 str="0"
+osmo_int_to_float_str_buf(1, 18) -> rc=20 str="0.000000000000000001"
+osmo_int_to_float_str_buf(1000000, 18) -> rc=14 str="0.000000000001"
+osmo_int_to_float_str_buf(-1000000, 18) -> rc=15 str="-0.000000000001"
+osmo_int_to_float_str_buf(1000001, 18) -> rc=20 str="0.000000000001000001"
+osmo_int_to_float_str_buf(-1000001, 18) -> rc=21 str="-0.000000000001000001"
+osmo_int_to_float_str_buf(1000100, 18) -> rc=18 str="0.0000000000010001"
+osmo_int_to_float_str_buf(-1010000, 18) -> rc=17 str="-0.00000000000101"
+osmo_int_to_float_str_buf(1100000, 18) -> rc=15 str="0.0000000000011"
+osmo_int_to_float_str_buf(10000000, 18) -> rc=13 str="0.00000000001"
+osmo_int_to_float_str_buf(-10000000, 18) -> rc=14 str="-0.00000000001"
+osmo_int_to_float_str_buf(100000000, 18) -> rc=12 str="0.0000000001"
+osmo_int_to_float_str_buf(-100000000, 18) -> rc=13 str="-0.0000000001"
+osmo_int_to_float_str_buf(9223372036854775807, 18) -> rc=20 str="9.223372036854775807"
+osmo_int_to_float_str_buf(-9223372036854775807, 18) -> rc=21 str="-9.223372036854775807"
+osmo_int_to_float_str_buf(-9223372036854775808, 18) -> rc=4 str="-ERR"
+osmo_int_to_float_str_buf(0, 19) -> rc=1 str="0"
+osmo_int_to_float_str_buf(1, 19) -> rc=21 str="0.0000000000000000001"
+osmo_int_to_float_str_buf(1000000, 19) -> rc=15 str="0.0000000000001"
+osmo_int_to_float_str_buf(-1000000, 19) -> rc=16 str="-0.0000000000001"
+osmo_int_to_float_str_buf(1000001, 19) -> rc=21 str="0.0000000000001000001"
+osmo_int_to_float_str_buf(-1000001, 19) -> rc=22 str="-0.0000000000001000001"
+osmo_int_to_float_str_buf(1000100, 19) -> rc=19 str="0.00000000000010001"
+osmo_int_to_float_str_buf(-1010000, 19) -> rc=18 str="-0.000000000000101"
+osmo_int_to_float_str_buf(1100000, 19) -> rc=16 str="0.00000000000011"
+osmo_int_to_float_str_buf(10000000, 19) -> rc=14 str="0.000000000001"
+osmo_int_to_float_str_buf(-10000000, 19) -> rc=15 str="-0.000000000001"
+osmo_int_to_float_str_buf(100000000, 19) -> rc=13 str="0.00000000001"
+osmo_int_to_float_str_buf(-100000000, 19) -> rc=14 str="-0.00000000001"
+osmo_int_to_float_str_buf(9223372036854775807, 19) -> rc=21 str="0.9223372036854775807"
+osmo_int_to_float_str_buf(-9223372036854775807, 19) -> rc=22 str="-0.9223372036854775807"
+osmo_int_to_float_str_buf(-9223372036854775808, 19) -> rc=4 str="-ERR"
+osmo_int_to_float_str_buf(0, 23) -> rc=1 str="0"
+osmo_int_to_float_str_buf(1, 23) -> rc=25 str="0.00000000000000000000001"
+osmo_int_to_float_str_buf(1000000, 23) -> rc=19 str="0.00000000000000001"
+osmo_int_to_float_str_buf(-1000000, 23) -> rc=20 str="-0.00000000000000001"
+osmo_int_to_float_str_buf(1000001, 23) -> rc=25 str="0.00000000000000001000001"
+osmo_int_to_float_str_buf(-1000001, 23) -> rc=26 str="-0.00000000000000001000001"
+osmo_int_to_float_str_buf(1000100, 23) -> rc=23 str="0.000000000000000010001"
+osmo_int_to_float_str_buf(-1010000, 23) -> rc=22 str="-0.0000000000000000101"
+osmo_int_to_float_str_buf(1100000, 23) -> rc=20 str="0.000000000000000011"
+osmo_int_to_float_str_buf(10000000, 23) -> rc=18 str="0.0000000000000001"
+osmo_int_to_float_str_buf(-10000000, 23) -> rc=19 str="-0.0000000000000001"
+osmo_int_to_float_str_buf(100000000, 23) -> rc=17 str="0.000000000000001"
+osmo_int_to_float_str_buf(-100000000, 23) -> rc=18 str="-0.000000000000001"
+osmo_int_to_float_str_buf(9223372036854775807, 23) -> rc=25 str="0.00009223372036854775807"
+osmo_int_to_float_str_buf(-9223372036854775807, 23) -> rc=26 str="-0.00009223372036854775807"
+osmo_int_to_float_str_buf(-9223372036854775808, 23) -> rc=4 str="-ERR"