libsigrok/tests/analog.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2015 Uwe Hermann <uwe@hermann-uwe.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, see <http://www.gnu.org/licenses/>.
 */

#include <config.h>
#include <stdlib.h>
#include <math.h>
#include <check.h>
#include <libsigrok/libsigrok.h>
#include "lib.h"

/*
 * This test sequence cannot use internal helpers, since it's limited
 * to the library's public API (by design). That is why there are local
 * helper routines for endianess handling.
 */

static int host_be;

static void get_host_endianess(void)
{
	int x;
	uint8_t *p;

	p = (void *)&x;
	x = 1;
	host_be = *p ? 0 : 1;
}

static void swap_bytes(uint8_t *buff, size_t blen)
{
	size_t idx;
	uint8_t tmp;

	for (idx = 0; idx < blen / 2; idx++) {
		tmp = buff[blen - 1 - idx];
		buff[blen - 1 - idx] = buff[idx];
		buff[idx] = tmp;
	}
}

static int sr_analog_init_(struct sr_datafeed_analog *analog,
		struct sr_analog_encoding *encoding,
		struct sr_analog_meaning *meaning,
		struct sr_analog_spec *spec,
		int digits)
{
	memset(analog, 0, sizeof(*analog));
	memset(encoding, 0, sizeof(*encoding));
	memset(meaning, 0, sizeof(*meaning));
	memset(spec, 0, sizeof(*spec));

	analog->encoding = encoding;
	analog->meaning = meaning;
	analog->spec = spec;

	encoding->unitsize = sizeof(float);
	encoding->is_float = TRUE;
#ifdef WORDS_BIGENDIAN
	encoding->is_bigendian = TRUE;
#else
	encoding->is_bigendian = FALSE;
#endif
	encoding->digits = digits;
	encoding->is_digits_decimal = TRUE;
	encoding->scale.p = 1;
	encoding->scale.q = 1;
	encoding->offset.p = 0;
	encoding->offset.q = 1;

	spec->spec_digits = digits;

	return SR_OK;
}

START_TEST(test_analog_to_float)
{
	int ret;
	unsigned int i;
	float f, fout;
	struct sr_channel ch;
	struct sr_datafeed_analog analog;
	struct sr_analog_encoding encoding;
	struct sr_analog_meaning meaning;
	struct sr_analog_spec spec;
	const float v[] = {-12.9, -333.999, 0, 3.1415, 29.7, 989898.121212};

	sr_analog_init_(&analog, &encoding, &meaning, &spec, 3);
	analog.num_samples = 1;
	analog.data = &f;
	meaning.channels = g_slist_append(NULL, &ch);

	for (i = 0; i < ARRAY_SIZE(v); i++) {
		fout = 19;
		f = v[i];
		ret = sr_analog_to_float(&analog, &fout);
		fail_unless(ret == SR_OK, "sr_analog_to_float() failed: %d.", ret);
		fail_unless(fabs(f - fout) <= 0.001, "%f != %f", f, fout);
	}
}
END_TEST

START_TEST(test_analog_to_float_null)
{
	int ret;
	float f, fout;
	struct sr_datafeed_analog analog;
	struct sr_analog_encoding encoding;
	struct sr_analog_meaning meaning;
	struct sr_analog_spec spec;

	f = G_PI;
	sr_analog_init_(&analog, &encoding, &meaning, &spec, 3);
	analog.num_samples = 1;
	analog.data = &f;

	ret = sr_analog_to_float(NULL, &fout);
	fail_unless(ret == SR_ERR_ARG);
	ret = sr_analog_to_float(&analog, NULL);
	fail_unless(ret == SR_ERR_ARG);
	ret = sr_analog_to_float(NULL, NULL);
	fail_unless(ret == SR_ERR_ARG);

	analog.data = NULL;
	ret = sr_analog_to_float(&analog, &fout);
	fail_unless(ret == SR_ERR_ARG);
	analog.data = &f;

	analog.meaning = NULL;
	ret = sr_analog_to_float(&analog, &fout);
	fail_unless(ret == SR_ERR_ARG);
	analog.meaning = &meaning;

	analog.encoding = NULL;
	ret = sr_analog_to_float(&analog, &fout);
	fail_unless(ret == SR_ERR_ARG);
	analog.encoding = &encoding;
}
END_TEST

START_TEST(test_analog_to_float_conv)
{
	static const int with_diag = 0;

	struct {
		const char *desc;
		void *bytes;
		size_t nums, unit;
		int is_fp, is_sign, is_be;
		int scale, offset;
		float *want;
	} *item, items[] = {
		/* Test to cover multiple values in an array, odd numbers. */
		{
			.desc = "float single input, native, value array",
			.bytes = (float[]){ -12.9, -333.999, 0, 3.14, 29.7, 9898.12, },
			.nums = 6, .unit = sizeof(float),
			.is_fp = TRUE, .is_sign = FALSE, .is_be = host_be,
			.scale = 1, .offset = 0,
			.want = (float[]){ -12.9, -333.999, 0, 3.14, 29.7, 9898.12, },
		},
		/* Tests to cover floating point input data conversion. */
		{
			.desc = "float single input, native",
			.bytes = (float[]){ 1.0, 2.0, 3.0, 4.0, },
			.nums = 4, .unit = sizeof(float),
			.is_fp = TRUE, .is_sign = FALSE, .is_be = host_be,
			.scale = 1, .offset = 0,
			.want = (float[]){ 1.0, 2.0, 3.0, 4.0, },
		},
		{
			.desc = "float single input, big endian",
			.bytes = (float[]){ 1.0, 2.0, 3.0, 4.0, },
			.nums = 4, .unit = sizeof(float),
			.is_fp = TRUE, .is_sign = FALSE, .is_be = TRUE,
			.scale = 1, .offset = 0,
			.want = (float[]){ 1.0, 2.0, 3.0, 4.0, },
		},
		{
			.desc = "float single input, little endian",
			.bytes = (float[]){ 1.0, 2.0, 3.0, 4.0, },
			.nums = 4, .unit = sizeof(float),
			.is_fp = TRUE, .is_sign = FALSE, .is_be = FALSE,
			.scale = 1, .offset = 0,
			.want = (float[]){ 1.0, 2.0, 3.0, 4.0, },
		},
		{
			.desc = "float double input, native",
			.bytes = (double[]){ 1.0, 2.0, 3.0, 4.0, },
			.nums = 4, .unit = sizeof(double),
			.is_fp = TRUE, .is_sign = FALSE, .is_be = host_be,
			.scale = 1, .offset = 0,
			.want = (float[]){ 1.0, 2.0, 3.0, 4.0, },
		},
		{
			.desc = "float half input, unsupported, fake bytes",
			.bytes = (uint16_t[]){ 0x1234, 0x5678, },
			.nums = 2, .unit = sizeof(uint16_t),
			.is_fp = TRUE, .is_sign = FALSE, .is_be = host_be,
			.want = NULL,
		},
		{
			.desc = "float quad input, unsupported, fake bytes",
			.bytes = (uint64_t[]){ 0x0, 0x0, },
			.nums = 1, .unit = 2 * sizeof(uint64_t),
			.is_fp = TRUE, .is_sign = FALSE, .is_be = host_be,
			.want = NULL,
		},
		/* Tests to cover integer input data conversion. */
		{
			.desc = "int u8 input",
			.bytes = (uint8_t[]){ 1, 2, 3, 4, },
			.nums = 4, .unit = sizeof(uint8_t),
			.is_fp = FALSE, .is_sign = FALSE, .is_be = host_be,
			.scale = 1, .offset = 0,
			.want = (float[]){ 1.0, 2.0, 3.0, 4.0, },
		},
		{
			.desc = "int i8 input",
			.bytes = (int8_t[]){ -1, 2, -3, 4, },
			.nums = 4, .unit = sizeof(int8_t),
			.is_fp = FALSE, .is_sign = TRUE, .is_be = host_be,
			.scale = 1, .offset = 0,
			.want = (float[]){ -1.0, 2.0, -3.0, 4.0, },
		},
		{
			.desc = "int u16 input, big endian",
			.bytes = (uint16_t[]){ 1, 2, 3, 4, },
			.nums = 4, .unit = sizeof(uint16_t),
			.is_fp = FALSE, .is_sign = FALSE, .is_be = TRUE,
			.scale = 1, .offset = 0,
			.want = (float[]){ 1.0, 2.0, 3.0, 4.0, },
		},
		{
			.desc = "int u16 input, little endian",
			.bytes = (uint16_t[]){ 1, 2, 3, 4, },
			.nums = 4, .unit = sizeof(uint16_t),
			.is_fp = FALSE, .is_sign = FALSE, .is_be = FALSE,
			.scale = 1, .offset = 0,
			.want = (float[]){ 1.0, 2.0, 3.0, 4.0, },
		},
		{
			.desc = "int i16 input, big endian",
			.bytes = (int16_t[]){ 1, -2, 3, -4, },
			.nums = 4, .unit = sizeof(int16_t),
			.is_fp = FALSE, .is_sign = TRUE, .is_be = TRUE,
			.scale = 1, .offset = 0,
			.want = (float[]){ 1.0, -2.0, 3.0, -4.0, },
		},
		{
			.desc = "int i16 input, little endian",
			.bytes = (int16_t[]){ 1, -2, 3, -4, },
			.nums = 4, .unit = sizeof(int16_t),
			.is_fp = FALSE, .is_sign = TRUE, .is_be = FALSE,
			.scale = 1, .offset = 0,
			.want = (float[]){ 1.0, -2.0, 3.0, -4.0, },
		},
		{
			.desc = "int u32 input, big endian",
			.bytes = (uint32_t[]){ 1, 2, 3, 4, },
			.nums = 4, .unit = sizeof(uint32_t),
			.is_fp = FALSE, .is_sign = FALSE, .is_be = TRUE,
			.scale = 1, .offset = 0,
			.want = (float[]){ 1.0, 2.0, 3.0, 4.0, },
		},
		{
			.desc = "int u32 input, little endian",
			.bytes = (uint32_t[]){ 1, 2, 3, 4, },
			.nums = 4, .unit = sizeof(uint32_t),
			.is_fp = FALSE, .is_sign = FALSE, .is_be = FALSE,
			.scale = 1, .offset = 0,
			.want = (float[]){ 1.0, 2.0, 3.0, 4.0, },
		},
		{
			.desc = "int i32 input, big endian",
			.bytes = (int32_t[]){ 1, 2, -3, -4, },
			.nums = 4, .unit = sizeof(int32_t),
			.is_fp = FALSE, .is_sign = TRUE, .is_be = TRUE,
			.scale = 1, .offset = 0,
			.want = (float[]){ 1.0, 2.0, -3.0, -4.0, },
		},
		{
			.desc = "int i32 input, little endian",
			.bytes = (int32_t[]){ 1, 2, -3, -4, },
			.nums = 4, .unit = sizeof(int32_t),
			.is_fp = FALSE, .is_sign = TRUE, .is_be = FALSE,
			.scale = 1, .offset = 0,
			.want = (float[]){ 1.0, 2.0, -3.0, -4.0, },
		},
		{
			.desc = "int u64 input, unsupported",
			.bytes = (uint64_t[]){ 1, 2, 3, 4, },
			.nums = 4, .unit = sizeof(uint64_t),
			.is_fp = FALSE, .is_sign = FALSE, .is_be = TRUE,
			.want = NULL,
		},
		/* Tests to cover scale/offset calculation. */
		{
			.desc = "float single input, scale + offset",
			.bytes = (float[]){ 1.0, 2.0, 3.0, 4.0, },
			.nums = 4, .unit = sizeof(float),
			.is_fp = TRUE, .is_sign = FALSE, .is_be = host_be,
			.scale = 3, .offset = 2,
			.want = (float[]){ 5.0, 8.0, 11.0, 14.0, },
		},
		{
			.desc = "int u8 input, scale + offset",
			.bytes = (uint8_t[]){ 1, 2, 3, 4, },
			.nums = 4, .unit = sizeof(uint8_t),
			.is_fp = FALSE, .is_sign = FALSE, .is_be = TRUE,
			.scale = 3, .offset = 2,
			.want = (float[]){ 5.0, 8.0, 11.0, 14.0, },
		},
	};
	const size_t max_floats = 6;
	struct sr_channel ch = {
		.index = 0,
		.enabled = TRUE,
		.type = SR_CHANNEL_LOGIC,
		.name = "input",
	};

	size_t item_idx;
	char item_text[32];
	struct sr_datafeed_analog analog;
	struct sr_analog_encoding encoding;
	struct sr_analog_meaning meaning;
	struct sr_analog_spec spec;
	size_t byte_count, value_idx;
	uint8_t f_in[max_floats * sizeof(double)], *byte_ptr;
	float f_out[max_floats];
	int ret;
	float want, have;

	for (item_idx = 0; item_idx < ARRAY_SIZE(items); item_idx++) {
		item = &items[item_idx];

		/* Construct "4x u32le" style test item identification. */
		snprintf(item_text, sizeof(item_text), "%zu: %zux %c%zu%s",
			item_idx, item->nums,
			item->is_fp ? 'f' : item->is_sign ? 'i' : 'u',
			item->unit * 8, item->is_be ? "be" : "le");
		if (with_diag) {
			fprintf(stderr, "%s -- %s", item_text, item->desc);
			fflush(stderr);
		}

		/* Copy input data bytes, optionally adjust endianess. */
		byte_count = item->nums * item->unit;
		memcpy(f_in, item->bytes, byte_count);
		if (item->is_be != host_be) {
			byte_ptr = &f_in[0];
			for (value_idx = 0; value_idx < item->nums; value_idx++) {
				swap_bytes(byte_ptr, item->unit);
				byte_ptr += item->unit;
			}
		}
		if (with_diag) {
			fprintf(stderr, " -- bytes:");
			for (value_idx = 0; value_idx < byte_count; value_idx++)
				fprintf(stderr, " %02x", f_in[value_idx]);
			fflush(stderr);
		}

		/* Setup the analog feed description. */
		sr_analog_init_(&analog, &encoding, &meaning, &spec, 3);
		analog.num_samples = item->nums;
		analog.data = &f_in[0];
		encoding.unitsize = item->unit;
		encoding.is_float = item->is_fp;
		encoding.is_signed = item->is_sign;
		encoding.is_bigendian = item->is_be;
		encoding.scale.p = item->scale ? item->scale : 1;
		encoding.offset.p = item->offset;
		meaning.channels = g_slist_append(NULL, &ch);

		/* Convert to an array of single precision float values. */
		ret = sr_analog_to_float(&analog, &f_out[0]);
		if (!item->want) {
			fail_if(ret == SR_OK,
				"%s: sr_analog_to_float() passed", item_text);
			if (with_diag) {
				fprintf(stderr, " -- expected fail, OK\n");
				fflush(stderr);
			}
			continue;
		}
		fail_unless(ret == SR_OK,
			"%s: sr_analog_to_float() failed: %d", item_text, ret);
		if (with_diag) {
			fprintf(stderr, " -- float:");
			for (value_idx = 0; value_idx < item->nums; value_idx++)
				fprintf(stderr, " %f", f_out[value_idx]);
			fprintf(stderr, "\n");
			fflush(stderr);
		}

		/*
		 * Compare result data to the expectation. No tolerance
		 * is required here due to the input set's values. This
		 * test concentrates on endianess / data type / bit count
		 * conversion and simple scale/offset calculation, neither
		 * on precision nor rounding nor truncation.
		 */
		for (value_idx = 0; value_idx < item->nums; value_idx++) {
			want = item->want[value_idx];
			have = f_out[value_idx];
			fail_unless(want == have,
				"%s: input %f != output %f",
				item_text, want, have);
		}
	}
}
END_TEST

START_TEST(test_analog_si_prefix)
{
	struct {
		float input_value;
		int input_digits;
		float output_value;
		int output_digits;
		const char *output_si_prefix;
	} v[] = {
		{   12.0     ,  0,  12.0  ,    0, ""  },
		{   12.0     ,  1,  12.0  ,    1, ""  },
		{   12.0     , -1,   0.012,    2, "k" },
		{ 1024.0     ,  0,   1.024,    3, "k" },
		{ 1024.0     , -1,   1.024,    2, "k" },
		{ 1024.0     , -3,   1.024,    0, "k" },
		{   12.0e5   ,  0,   1.2,      6, "M" },
		{    0.123456,  0,   0.123456, 0, ""  },
		{    0.123456,  1,   0.123456, 1, ""  },
		{    0.123456,  2,   0.123456, 2, ""  },
		{    0.123456,  3, 123.456,    0, "m" },
		{    0.123456,  4, 123.456,    1, "m" },
		{    0.123456,  5, 123.456,    2, "m" },
		{    0.123456,  6, 123.456,    3, "m" },
		{    0.123456,  7, 123.456,    4, "m" },
		{    0.0123  ,  4,  12.3,      1, "m" },
		{    0.00123 ,  5,   1.23,     2, "m" },
		{    0.000123,  4,   0.123,    1, "m" },
		{    0.000123,  5,   0.123,    2, "m" },
		{    0.000123,  6, 123.0,      0, "µ" },
		{    0.000123,  7, 123.0,      1, "µ" },
	};

	for (unsigned int i = 0; i < ARRAY_SIZE(v); i++) {
		float value = v[i].input_value;
		int digits = v[i].input_digits;
		const char *si_prefix = sr_analog_si_prefix(&value, &digits);

		fail_unless(fabs(value - v[i].output_value) <= 0.00001,
			"sr_analog_si_prefix() unexpected output value %f (i=%d).",
			value , i);
		fail_unless(digits == v[i].output_digits,
			"sr_analog_si_prefix() unexpected output digits %d (i=%d).",
			digits, i);
		fail_unless(!strcmp(si_prefix, v[i].output_si_prefix),
			"sr_analog_si_prefix() unexpected output prefix \"%s\" (i=%d).",
			si_prefix, i);
	}
}
END_TEST

START_TEST(test_analog_si_prefix_null)
{
	float value = 1.23;
	int digits = 1;
	const char *si_prefix;

	si_prefix = sr_analog_si_prefix(NULL, &digits);
	fail_unless(!strcmp(si_prefix, ""));
	si_prefix = sr_analog_si_prefix(&value, NULL);
	fail_unless(!strcmp(si_prefix, ""));
	si_prefix = sr_analog_si_prefix(NULL, NULL);
	fail_unless(!strcmp(si_prefix, ""));
}
END_TEST

START_TEST(test_analog_unit_to_string)
{
	int ret;
	unsigned int i;
	char *result;
	struct sr_datafeed_analog analog;
	struct sr_analog_encoding encoding;
	struct sr_analog_meaning meaning;
	struct sr_analog_spec spec;
	const int u[] = {SR_UNIT_VOLT, SR_UNIT_AMPERE, SR_UNIT_CELSIUS};
	const int f[] = {SR_MQFLAG_RMS, 0, 0};
	const char *r[] = {"V RMS", "A", "°C"};

	sr_analog_init_(&analog, &encoding, &meaning, &spec, 3);

	for (i = 0; i < ARRAY_SIZE(r); i++) {
		meaning.unit = u[i];
		meaning.mqflags = f[i];
		ret = sr_analog_unit_to_string(&analog, &result);
		fail_unless(ret == SR_OK);
		fail_unless(result != NULL);
		fail_unless(!strcmp(result, r[i]), "%s != %s", result, r[i]);
		g_free(result);
	}
}
END_TEST

START_TEST(test_analog_unit_to_string_null)
{
	int ret;
	char *result;
	struct sr_datafeed_analog analog;
	struct sr_analog_encoding encoding;
	struct sr_analog_meaning meaning;
	struct sr_analog_spec spec;

	sr_analog_init_(&analog, &encoding, &meaning, &spec, 3);

	meaning.unit = SR_UNIT_VOLT;
	meaning.mqflags = SR_MQFLAG_RMS;

	ret = sr_analog_unit_to_string(NULL, &result);
	fail_unless(ret == SR_ERR_ARG);
	ret = sr_analog_unit_to_string(&analog, NULL);
	fail_unless(ret == SR_ERR_ARG);
	ret = sr_analog_unit_to_string(NULL, NULL);
	fail_unless(ret == SR_ERR_ARG);

	analog.meaning = NULL;
	ret = sr_analog_unit_to_string(&analog, &result);
	fail_unless(ret == SR_ERR_ARG);
}
END_TEST

START_TEST(test_set_rational)
{
	unsigned int i;
	struct sr_rational r;
	const int64_t p[] = {0, 1, -5, INT64_MAX};
	const uint64_t q[] = {0, 2, 7, UINT64_MAX};

	for (i = 0; i < ARRAY_SIZE(p); i++) {
		sr_rational_set(&r, p[i], q[i]);
		fail_unless(r.p == p[i] && r.q == q[i]);
	}
}
END_TEST

START_TEST(test_set_rational_null)
{
	sr_rational_set(NULL, 5, 7);
}
END_TEST

START_TEST(test_cmp_rational)
{
	const struct sr_rational r[] = { { 1, 1 },
		{ 2, 2 },
		{ 1000, 1000 },
		{ INT64_MAX, INT64_MAX },
		{ 1, 4 },
		{ 2, 8 },
		{ INT64_MAX, UINT64_MAX },
		{ INT64_MIN, UINT64_MAX },
	};

	fail_unless(sr_rational_eq(&r[0], &r[0]) == 1);
	fail_unless(sr_rational_eq(&r[0], &r[1]) == 1);
	fail_unless(sr_rational_eq(&r[1], &r[2]) == 1);
	fail_unless(sr_rational_eq(&r[2], &r[3]) == 1);
	fail_unless(sr_rational_eq(&r[3], &r[3]) == 1);

	fail_unless(sr_rational_eq(&r[4], &r[4]) == 1);
	fail_unless(sr_rational_eq(&r[4], &r[5]) == 1);
	fail_unless(sr_rational_eq(&r[5], &r[5]) == 1);

	fail_unless(sr_rational_eq(&r[6], &r[6]) == 1);
	fail_unless(sr_rational_eq(&r[7], &r[7]) == 1);

	fail_unless(sr_rational_eq(&r[1], &r[4]) == 0);
}
END_TEST

START_TEST(test_mult_rational)
{
	const struct sr_rational r[][3] = {
		/*   a    *    b    =    c   */
		{ { 1, 1 }, { 1, 1 }, { 1, 1 }},
		{ { 2, 1 }, { 3, 1 }, { 6, 1 }},
		{ { 1, 2 }, { 2, 1 }, { 1, 1 }},
		/* Test negative numbers */
		{ { -1, 2 }, { 2, 1 }, { -1, 1 }},
		{ { -1, 2 }, { -2, 1 }, { 1, 1 }},
		{ { -(1ll<<20), (1ll<<10) }, { -(1ll<<20), 1 }, { (1ll<<30), 1 }},
		/* Test reduction */
		{ { INT32_MAX, (1ll<<12) }, { (1<<2), 1 }, { INT32_MAX, (1ll<<10) }},
		{ { INT64_MAX, (1ll<<63) }, { (1<<3), 1 }, { INT64_MAX, (1ll<<60) }},
		/* Test large numbers */
		{ {  (1ll<<40), (1ll<<10) }, {  (1ll<<30), 1 }, { (1ll<<60), 1 }},
		{ { -(1ll<<40), (1ll<<10) }, { -(1ll<<30), 1 }, { (1ll<<60), 1 }},

		{ { 1000, 1 }, { 8000, 1 }, { 8000000, 1 }},
		{ { 10000, 1 }, { 80000, 1 }, { 800000000, 1 }},
		{ { 10000*3, 4 }, { 80000*3, 1 }, { 200000000*9, 1 }},
		{ { 1, 1000 }, { 1, 8000 }, { 1, 8000000 }},
		{ { 1, 10000 }, { 1, 80000 }, { 1, 800000000 }},
		{ { 4, 10000*3 }, { 1, 80000*3 }, { 1, 200000000*9 }},

		{ { -10000*3, 4 }, { 80000*3, 1 }, { -200000000*9, 1 }},
		{ { 10000*3, 4 }, { -80000*3, 1 }, { -200000000*9, 1 }},
	};

	for (unsigned i = 0; i < ARRAY_SIZE(r); i++) {
		struct sr_rational res;

		int rc = sr_rational_mult(&res, &r[i][0], &r[i][1]);
		fail_unless(rc == SR_OK);
		fail_unless(sr_rational_eq(&res, &r[i][2]) == 1,
			"sr_rational_mult() failed: [%d] %ld/%lu != %ld/%lu.",
			i, res.p, res.q, r[i][2].p, r[i][2].q);
	}
}
END_TEST

START_TEST(test_div_rational)
{
	const struct sr_rational r[][3] = {
		/*   a    *    b    =    c   */
		{ { 1, 1 }, { 1, 1 }, { 1, 1 }},
		{ { 2, 1 }, { 1, 3 }, { 6, 1 }},
		{ { 1, 2 }, { 1, 2 }, { 1, 1 }},
		/* Test negative numbers */
		{ { -1, 2 }, { 1, 2 }, { -1, 1 }},
		{ { -1, 2 }, { -1, 2 }, { 1, 1 }},
		{ { -(1ll<<20), (1ll<<10) }, { -1, (1ll<<20) }, { (1ll<<30), 1 }},
		/* Test reduction */
		{ { INT32_MAX, (1ll<<12) }, { 1, (1<<2) }, { INT32_MAX, (1ll<<10) }},
		{ { INT64_MAX, (1ll<<63) }, { 1, (1<<3) }, { INT64_MAX, (1ll<<60) }},
		/* Test large numbers */
		{ {  (1ll<<40), (1ll<<10) }, {  1, (1ll<<30) }, { (1ll<<60), 1 }},
		{ { -(1ll<<40), (1ll<<10) }, { -1, (1ll<<30) }, { (1ll<<60), 1 }},

		{ { 10000*3, 4 }, { 1, 80000*3 }, { 200000000*9, 1 }},
		{ { 4, 10000*3 }, { 80000*3, 1 }, { 1, 200000000*9 }},

		{ { -10000*3, 4 }, { 1, 80000*3 }, { -200000000*9, 1 }},
		{ { 10000*3, 4 }, { -1, 80000*3 }, { -200000000*9, 1 }},
	};

	for (unsigned i = 0; i < ARRAY_SIZE(r); i++) {
		struct sr_rational res;

		int rc = sr_rational_div(&res, &r[i][0], &r[i][1]);
		fail_unless(rc == SR_OK);
		fail_unless(sr_rational_eq(&res, &r[i][2]) == 1,
			"sr_rational_mult() failed: [%d] %ld/%lu != %ld/%lu.",
			i, res.p, res.q, r[i][2].p, r[i][2].q);
	}

	{
		struct sr_rational res;
		int rc = sr_rational_div(&res, &r[0][0], &((struct sr_rational){ 0, 5 }));

		fail_unless(rc == SR_ERR_ARG);
	}
}
END_TEST

Suite *suite_analog(void)
{
	Suite *s;
	TCase *tc;

	get_host_endianess();

	s = suite_create("analog");

	tc = tcase_create("analog_to_float");
	tcase_add_test(tc, test_analog_to_float);
	tcase_add_test(tc, test_analog_to_float_null);
	tcase_add_test(tc, test_analog_to_float_conv);
	suite_add_tcase(s, tc);

	tc = tcase_create("analog_si_unit");
	tcase_add_test(tc, test_analog_si_prefix);
	tcase_add_test(tc, test_analog_si_prefix_null);
	tcase_add_test(tc, test_analog_unit_to_string);
	tcase_add_test(tc, test_analog_unit_to_string_null);
	suite_add_tcase(s, tc);

	tc = tcase_create("analog_rational");
	tcase_add_test(tc, test_set_rational);
	tcase_add_test(tc, test_set_rational_null);
	tcase_add_test(tc, test_cmp_rational);
	tcase_add_test(tc, test_mult_rational);
	tcase_add_test(tc, test_div_rational);
	suite_add_tcase(s, tc);

	return s;
}