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/* compare floats - a test utility */
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#include <math.h>
#include <errno.h>
/* Declarations */
/* Globals */
/* Main */
int main(int argc, char *argv[]) {
char usage[] = "Usage: %s [-t tolerance] file1 file2\n";
float tol = .001;
int opt;
while ((opt = getopt(argc, argv, "t:")) != -1) {
switch (opt) {
case 't':
tol = atof(optarg);
break;
default:
fprintf(stderr, usage, argv[0]);
exit(1);
}
}
if ((optind + 2) > argc) {
fprintf(stderr, usage, argv[0]);
exit(1);
}
char *fname1 = argv[optind++];
char *fname2 = argv[optind++];
FILE *f1 = fopen(fname1, "rb");
if (f1 == NULL) {
fprintf(stderr, "Error opening file1 \"%s\": ", fname1);
perror(NULL);
exit(1);
}
FILE *f2 = fopen(fname2, "rb");
if (f2 == NULL) {
fprintf(stderr, "Error opening file2 \"%s\": ", fname2);
perror(NULL);
exit(1);
}
float data1, data2;
int count = 0;
int errors = 0;
double rms_sum = 0;
while (fread(&data1, sizeof(float), 1, f1)) {
if (!fread(&data2, sizeof(float), 1, f2)) {
fprintf(stderr, "Error: file2 is shorter!");
exit(1);
}
float err = fabsf((data1 - data2) / data1);
if (err > tol) {
errors ++;
printf("%d %g %g %g\n", count, data1, data2, err);
}
rms_sum += (err * err);
count ++;
}
if (fread(&data2, sizeof(float), 1, f2)) {
fprintf(stderr, "Error: file1 is shorter\n");
exit(1);
}
if (errors) {
printf("Fail: %d errors\n", errors);
printf(" rms error = %g\n", ((double)rms_sum/count));
exit(1);
}
else printf("Pass\n");
exit(0);
} // main
/* vi:set ts=4 et sts=4: */
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