/**
* Convert scpi_number_t to string
* @param context
* @param value number value
* @param str target string
* @param len max length of string
* @return number of chars written to string
*/
size_t SCPI_NumberToStr(scpi_t * context, const scpi_choice_def_t * special, scpi_number_t * value, char * str, size_t len) {
const char * type;
const char * unit;
size_t result;
if (!value || !str) {
return 0;
}
if (value->special) {
if (SCPI_ChoiceToName(special, value->tag, &type)) {
strncpy(str, type, len);
return min(strlen(type), len);
} else {
str[0] = 0;
return 0;
}
}
result = SCPI_DoubleToStr(value->value, str, len);
unit = translateUnitInverse(context->units, value->unit);
if (unit) {
strncat(str, " ", len);
strncat(str, unit, len);
result += strlen(unit) + 1;
}
return result;
}
/**
* Write double (64bit) value to the result
* @param context
* @param val
* @return
*/
size_t SCPI_ResultDouble(scpi_t * context, double val) {
char buffer[32];
size_t result = 0;
size_t len = SCPI_DoubleToStr(val, buffer, sizeof (buffer));
result += writeDelimiter(context);
result += writeData(context, buffer, len);
context->output_count++;
return result;
}
static void test_doubleToStr() {
const size_t max = 49 + 1;
double val[] = {1, -1, 1.1, -1.1, 1e3, 1e30, -1.3e30, -1.3e-30};
int N = sizeof (val) / sizeof (*val);
int i;
char str[max];
char ref[max];
size_t len;
for (i = 0; i < N; i++) {
len = SCPI_DoubleToStr(val[i], str, max);
snprintf(ref, max, "%.15lg", val[i]);
CU_ASSERT(len == strlen(ref));
CU_ASSERT_STRING_EQUAL(str, ref);
}
}