From: Soeren Apel <redacted>
Date: Sat, 25 Feb 2017 21:19:42 +0000 (+0100)
Subject: Rework sr_period_string
X-Git-Tag: libsigrok-0.5.0~100
X-Git-Url: https://sigrok.org/gitweb/?p=libsigrok.git;a=commitdiff_plain;h=6984cfb245811df0f691928a6e4224d4f7ac5786;ds=sidebyside

Rework sr_period_string
---

diff --git a/include/libsigrok/proto.h b/include/libsigrok/proto.h
index 05e78864..01792a62 100644
--- a/include/libsigrok/proto.h
+++ b/include/libsigrok/proto.h
@@ -226,7 +226,7 @@ SR_API int sr_resource_set_hooks(struct sr_context *ctx,
 
 SR_API char *sr_si_string_u64(uint64_t x, const char *unit);
 SR_API char *sr_samplerate_string(uint64_t samplerate);
-SR_API char *sr_period_string(uint64_t frequency);
+SR_API char *sr_period_string(uint64_t v_p, uint64_t v_q);
 SR_API char *sr_voltage_string(uint64_t v_p, uint64_t v_q);
 SR_API int sr_parse_sizestring(const char *sizestring, uint64_t *size);
 SR_API uint64_t sr_parse_timestring(const char *timestring);
diff --git a/src/hardware/hameg-hmo/protocol.c b/src/hardware/hameg-hmo/protocol.c
index b0cdfe77..5b30648f 100644
--- a/src/hardware/hameg-hmo/protocol.c
+++ b/src/hardware/hameg-hmo/protocol.c
@@ -364,9 +364,8 @@ static void scope_state_dump(const struct scope_config *config,
 			state->digital_pods[i] ? "On" : "Off");
 	}
 
-	/* FIXME: this is wrong for TB > 1 second */
-	tmp = sr_period_string((*config->timebases)[state->timebase][1] /
-			       (*config->timebases)[state->timebase][0]);
+	tmp = sr_period_string((*config->timebases)[state->timebase][0],
+			       (*config->timebases)[state->timebase][1]);
 	sr_info("Current timebase: %s", tmp);
 	g_free(tmp);
 
diff --git a/src/hardware/lecroy-xstream/protocol.c b/src/hardware/lecroy-xstream/protocol.c
index 066bed2f..73691081 100644
--- a/src/hardware/lecroy-xstream/protocol.c
+++ b/src/hardware/lecroy-xstream/protocol.c
@@ -236,8 +236,8 @@ static void scope_state_dump(const struct scope_config *config,
 			tmp, state->analog_channels[i].vertical_offset);
 	}
 
-	tmp = sr_period_string(((float)config->timebases[state->timebase].q) /
-				((float)config->timebases[state->timebase].p));
+	tmp = sr_period_string(config->timebases[state->timebase].p,
+				config->timebases[state->timebase].q);
 	sr_info("Current timebase: %s", tmp);
 	g_free(tmp);
 
diff --git a/src/hardware/yokogawa-dlm/protocol.c b/src/hardware/yokogawa-dlm/protocol.c
index 08866898..cf885f7a 100644
--- a/src/hardware/yokogawa-dlm/protocol.c
+++ b/src/hardware/yokogawa-dlm/protocol.c
@@ -305,8 +305,8 @@ static void scope_state_dump(const struct scope_config *config,
 				state->pod_states[i] ? "On" : "Off");
 	}
 
-	tmp = sr_period_string(dlm_timebases[state->timebase][1] /
-			dlm_timebases[state->timebase][0]);
+	tmp = sr_period_string(dlm_timebases[state->timebase][0],
+			dlm_timebases[state->timebase][1]);
 	sr_info("Current timebase: %s", tmp);
 	g_free(tmp);
 
diff --git a/src/output/vcd.c b/src/output/vcd.c
index ba06c5ae..b97a4c38 100644
--- a/src/output/vcd.c
+++ b/src/output/vcd.c
@@ -129,7 +129,7 @@ static GString *gen_header(const struct sr_output *o)
 		ctx->period = SR_MHZ(1);
 	else
 		ctx->period = SR_KHZ(1);
-	frequency_s = sr_period_string(ctx->period);
+	frequency_s = sr_period_string(1, ctx->period);
 	g_string_append_printf(header, "$timescale %s $end\n", frequency_s);
 	g_free(frequency_s);
 
diff --git a/src/strutil.c b/src/strutil.c
index 4b5b9ec7..3b0afade 100644
--- a/src/strutil.c
+++ b/src/strutil.c
@@ -360,22 +360,37 @@ SR_API char *sr_samplerate_string(uint64_t samplerate)
  *
  * @since 0.1.0
  */
-SR_API char *sr_period_string(uint64_t frequency)
+SR_API char *sr_period_string(uint64_t v_p, uint64_t v_q)
 {
+	double freq, v;
 	char *o;
-	int r;
+	int prec, r;
+
+	freq = 1 / ((double)v_p / v_q);
 
-	/* Allocate enough for a uint64_t as string + " ms". */
 	o = g_malloc0(30 + 1);
 
-	if (frequency >= SR_GHZ(1))
-		r = snprintf(o, 30, "%lld ps", 1000000000000ull / frequency);
-	else if (frequency >= SR_MHZ(1))
-		r = snprintf(o, 30, "%lld ns", 1000000000ull / frequency);
-	else if (frequency >= SR_KHZ(1))
-		r = snprintf(o, 30, "%lld us", 1000000ull / frequency);
-	else
-		r = snprintf(o, 30, "%lld ms", 1000ull / frequency);
+	if (freq > SR_GHZ(1)) {
+		v = (double)v_p / v_q * 1000000000000.0;
+		prec = ((v - (uint64_t)v) < FLT_MIN) ? 0 : 3;
+		r = snprintf(o, 30, "%.*f ps", prec, v);
+	} else if (freq > SR_MHZ(1)) {
+		v = (double)v_p / v_q * 1000000000.0;
+		prec = ((v - (uint64_t)v) < FLT_MIN) ? 0 : 3;
+		r = snprintf(o, 30, "%.*f ns", prec, v);
+	} else if (freq > SR_KHZ(1)) {
+		v = (double)v_p / v_q * 1000000.0;
+		prec = ((v - (uint64_t)v) < FLT_MIN) ? 0 : 3;
+		r = snprintf(o, 30, "%.*f us", prec, v);
+	} else if (freq > 1) {
+		v = (double)v_p / v_q * 1000.0;
+		prec = ((v - (uint64_t)v) < FLT_MIN) ? 0 : 3;
+		r = snprintf(o, 30, "%.*f ms", prec, v);
+	} else {
+		v = (double)v_p / v_q;
+		prec = ((v - (uint64_t)v) < FLT_MIN) ? 0 : 3;
+		r = snprintf(o, 30, "%.*f s", prec, v);
+	}
 
 	if (r < 0) {
 		/* Something went wrong... */
diff --git a/tests/strutil.c b/tests/strutil.c
index 86f25f39..a36b6a2d 100644
--- a/tests/strutil.c
+++ b/tests/strutil.c
@@ -33,11 +33,11 @@ static void test_samplerate(uint64_t samplerate, const char *expected)
 	g_free(s);
 }
 
-static void test_period(uint64_t frequency, const char *expected)
+static void test_period(uint64_t v_p, uint64_t v_q, const char *expected)
 {
 	char *s;
 
-	s = sr_period_string(frequency);
+	s = sr_period_string(v_p, v_q);
 	fail_unless(s != NULL);
 	fail_unless(!strcmp(s, expected),
 		    "Invalid result for '%s': %s.", expected, s);
@@ -179,33 +179,38 @@ END_TEST
 
 START_TEST(test_hz_period)
 {
-	test_period(1, "1000 ms");
-	test_period(5, "200 ms");
-	test_period(72, "13 ms");
-	test_period(388, "2 ms");
+	test_period(1, 1, "1 s");
+	test_period(1, 5, "200 ms");
+	test_period(1, 72, "13.889 ms");
+	test_period(1, 388, "2.577 ms");
+	test_period(10, 1000, "10 ms");
 
 	/* Again, but now using SR_HZ(). */
-	test_period(SR_HZ(1), "1000 ms");
-	test_period(SR_HZ(5), "200 ms");
-	test_period(SR_HZ(72), "13 ms");
-	test_period(SR_HZ(388), "2 ms");
+	test_period(1, SR_HZ(1), "1 s");
+	test_period(1, SR_HZ(5), "200 ms");
+	test_period(1, SR_HZ(72), "13.889 ms");
+	test_period(1, SR_HZ(388), "2.577 ms");
+	test_period(10, SR_HZ(100), "100 ms");
 }
 END_TEST
 
 START_TEST(test_ghz_period)
 {
 	/* Note: Numbers > 2^32 need a ULL suffix. */
-
-	test_period(1000000000, "1000 ps");
-	test_period(5000000000ULL, "200 ps");
-	test_period(72000000000ULL, "13 ps");
-	test_period(388000000000ULL, "2 ps");
+	test_period(1, 1000000000, "1 ns");
+	test_period(1, 5000000000ULL, "200 ps");
+	test_period(1, 72000000000ULL, "13.889 ps");
+	test_period(1, 388000000000ULL, "2.577 ps");
+	test_period(10, 1000000000000, "10 ps");
+	test_period(200, 1000000000000ULL, "200 ps");
 
 	/* Again, but now using SR_GHZ(). */
-	test_period(SR_GHZ(1), "1000 ps");
-	test_period(SR_GHZ(5), "200 ps");
-	test_period(SR_GHZ(72), "13 ps");
-	test_period(SR_GHZ(388), "2 ps");
+	test_period(1, SR_GHZ(1), "1 ns");
+	test_period(1, SR_GHZ(5), "200 ps");
+	test_period(1, SR_GHZ(72), "13.889 ps");
+	test_period(1, SR_GHZ(388), "2.577 ps");
+	test_period(10, SR_GHZ(1), "10 ns");
+	test_period(200, SR_GHZ(1000), "200 ps");
 }
 END_TEST