kern-scale: properly set encoding digits

[libsigrok.git] / src / scale / kern.c

diff --git a/src/scale/kern.c b/src/scale/kern.c
index 55e02ad4419aadfdff29bfe168b5178a3047930f..bd819197e73aff6f42aafd2b221c64d6eeb64b85 100644 (file)
--- a/src/scale/kern.c
+++ b/src/scale/kern.c
@@ -44,9 +44,9 @@ static int get_buflen(const uint8_t *buf)
 }
 
 static int parse_value(const uint8_t *buf, float *result,
-               const struct kern_info *info)
+               int *digits, const struct kern_info *info)
 {
-       char *strval;
+       char *strval, *ptrdot;
        float floatval;
        int s2, len;
 
@@ -62,6 +62,9 @@ static int parse_value(const uint8_t *buf, float *result,
 
        strval = g_strndup((const char *)buf, len);
        floatval = g_ascii_strtod(strval, NULL);
+       ptrdot = strchr(strval, '.');
+       if (ptrdot)
+               *digits = len - (ptrdot - strval + 1);
        g_free(strval);
        *result = floatval;
 
@@ -199,18 +202,21 @@ SR_PRIV gboolean sr_kern_packet_valid(const uint8_t *buf)
 SR_PRIV int sr_kern_parse(const uint8_t *buf, float *floatval,
                          struct sr_datafeed_analog *analog, void *info)
 {
-       int ret;
+       int ret, digits = 0;
        struct kern_info *info_local;
 
        info_local = (struct kern_info *)info;
 
        info_local->buflen = get_buflen(buf);
 
-       if ((ret = parse_value(buf, floatval, info_local)) != SR_OK) {
+       if ((ret = parse_value(buf, floatval, &digits, info_local)) != SR_OK) {
                sr_dbg("Error parsing value: %d.", ret);
                return ret;
        }
 
+       analog->encoding->digits = digits;
+       analog->spec->spec_digits = digits;
+
        parse_flags(buf, info_local);
        handle_flags(analog, floatval, info_local);