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yokogawa-dlm: Fix array_float_get()

This commit is contained in:
Soeren Apel 2016-01-29 21:39:20 +01:00
parent 8cccbac8da
commit b18b8a9202
1 changed files with 18 additions and 7 deletions
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23
src/hardware/yokogawa-dlm/protocol.c
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@ -372,7 +372,7 @@ static int array_option_get(char *value, const char *(*array)[],
static int array_float_get(gchar *value, const uint64_t array[][2],
int array_len, int *result)
{
int i;
int i, pos, e;
uint64_t f;
float s;
unsigned int s_int;
@ -381,22 +381,33 @@ static int array_float_get(gchar *value, const uint64_t array[][2],
memset(ss, 0, sizeof(ss));
memset(es, 0, sizeof(es));
strncpy(ss, value, 5);
strncpy(es, &(value[6]), 3);
/* Get index of the separating 'E' character and break up the string. */
pos = (int)g_strstr_len(value, strlen(value), "E");
pos -= (int)value;
strncpy(ss, value, pos);
strncpy(es, &(value[pos+1]), 3);
if (sr_atof_ascii(ss, &s) != SR_OK)
return SR_ERR;
if (sr_atoi(es, &i) != SR_OK)
if (sr_atoi(es, &e) != SR_OK)
return SR_ERR;
/* Transform e.g. 10^-03 to 1000 as the array stores the inverse. */
f = pow(10, abs(i));
f = pow(10, abs(e));
/*
* Adjust the significand/factor pair to make sure
* that f is a multiple of 1000.
*/
while ((int)fmod(log10(f), 3) > 0) { s *= 10; f *= 10; }
while ((int)fmod(log10(f), 3) > 0) {
s *= 10;
if (e < 0)
f *= 10;
else
f /= 10;
}
/* Truncate s to circumvent rounding errors. */
s_int = (unsigned int)s;