web: move opt logic to c

1 files changed, 66 insertions, 7 deletions

diff --git a/web/web_opts.c b/web/web_opts.c
index 945909f..c156598 100644
--- a/web/web_opts.c
+++ b/web/web_opts.c
@@ -4,15 +4,67 @@
 
 #include <math.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 
 #include <emscripten/emscripten.h>
 
+#define PREFIX "dartboat_"
+
 int delay_ms = 1000;
 
+void set_delay(char *val)
+{
+	delay_ms = atoi(val);
+}
+
+void set_stdev(char *val)
+{
+	double stdev = strtod(val, NULL);
+	if (isfinite(stdev))
+		horizontal_stdev = vertical_stdev = stdev;
+}
+
+char *prefix_opt(char *opt)
+{
+	char len = strlen(opt);
+	char *s = malloc(len + sizeof(PREFIX));
+	memcpy(s, PREFIX, sizeof(PREFIX) - 1);
+	memcpy(s + sizeof(PREFIX) - 1, opt, len + 1);
+
+	return s;
+}
+
+char *read_opt(char *opt)
+{
+	char *s = prefix_opt(opt);
+	char *val = (char *)EM_ASM_INT({return readOpt($0)}, s);
+	free(s);
+	return val;
+}
+
+void read_delay()
+{
+	char *val = read_opt("delay");
+	if (!val) return;
+
+	set_delay(val);
+	free(val);
+}
+
+void read_stdev()
+{
+	char *val = read_opt("stdev");
+	if (!val) return;
+
+	set_stdev(val);
+	free(val);
+}
+
 void opts_init()
 {
-	EM_ASM(readOpts());
+	read_delay();
+	read_stdev();
 
 	char buf[64];
 	sprintf(buf, "%d", delay_ms);
@@ -30,15 +82,22 @@ void opts_init()
 	EM_ASM({elemSetValue($0, $1)}, "#stdev", buf);
 }
 
-EMSCRIPTEN_KEEPALIVE
-void set_delay(int delay)
+void store_opt(char *opt, char  *val)
 {
-	delay_ms = delay;
+	char *s = prefix_opt(opt);
+	EM_ASM({storeOpt($0, $1)}, s, val);
+	free(s);
 }
 
 EMSCRIPTEN_KEEPALIVE
-void set_stdev(float stdev)
+void set_opt(char *opt, char *val)
 {
-	if (!isnan(stdev))
-		horizontal_stdev = vertical_stdev = stdev;
+	if (!strcmp(opt, "delay"))
+		set_delay(val);
+	else if (!strcmp(opt, "stdev"))
+		set_stdev(val);
+	else
+		return;
+
+	store_opt(opt, val);
 }