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#include <unistd.h>
#include "unit_label.h"
/* Assign *unit a unit string from table unit_label that best fits value.
* returns the value reduced by the chosen unit's magnitude
*
* Tables are worked through in order, stopping at an entry with a falsey
* label. While the value is larger than the current unit's maximum count,
* the value is divided by this count and the next unit in the table is
* examined. Example:
* {100, "flooby" },
* {500, "glargle"},
* { 30, "lafplop"}, // Can be any non-zero count
* { 0, NULL } // Can be any count
*
* Given this table is in `labels`,
* ret1 = make_unit_whatsit(labels, &unit1, 150);
* ret2 = make_unit_whatsit(labels, &unit2, 50);
* ret3 = make_unit_whatsit(labels, &unit3, 55000);
* leaves ret1 as 1.5 and unit1 as "gargle",
* leaves ret2 as 50 and unit2 as "flooby",
* leaves ret3 as 1.1 and unit3 as "lafplop",
*/
double make_unit_whatsit(const struct unit_label l[], char **unit, double value) {
size_t i = 0;
for (i = 0; l[i+1].label; i++) {
if (l[i].count > value) {
break;
}
value /= l[i].count;
}
*unit = l[i].label;
return value;
}
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