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bool getDimensionForKey( const char *key, unsigned int *value, config_file_t *config, unsigned int dimension_max, unsigned int object_size )
{
const char *val;
int size = 0;
int sum = 0;
bool negative = false;
bool percentage = false;
if (getValueForKey(key, &val, &size, config))
{
if ( size )
{
if (*val == '-')
{
negative = true;
val++;
size--;
}
if (val[size-1] == '%')
{
percentage = true;
size--;
}
// convert string to integer
for (sum = 0; size > 0; size--)
{
if (*val < '0' || *val > '9')
return false;
sum = (sum * 10) + (*val++ - '0');
}
if (percentage)
sum = ( dimension_max * sum ) / 100;
// calculate offset from opposite origin
if (negative)
sum = ( ( dimension_max - object_size ) - sum );
} else {
// null value calculate center
sum = ( dimension_max - object_size ) / 2;
}
*value = (uint16_t) sum;
return true;
}
// key not found
return false;
}