toaruos/apps/test-fpclassify.c

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#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <math.h>
int main(int argc, char * argv[]) {
if (argc < 2) return 1;
union {
double asFloat;
uint64_t asInt;
} bits;
if (!strcmp(argv[1], "inf")) {
bits.asFloat = INFINITY;
} else if (!strcmp(argv[1], "nan")) {
bits.asFloat = NAN;
} else {
bits.asFloat = strtod(argv[1], NULL);
}
printf("0x%016zx %d\n", bits.asInt, fpclassify(bits.asFloat));
return 0;
}