/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2014 PALO, Richard. All rights reserved.
* Copyright 2014 OmniTI Computer Consulting, Inc. All rights reserved.
*/
/*
* Test rounding of floating point numbers in libc's *printf() routines.
*
* C99 must be enabled to get DECIMAL_DIG defined, but it looks like all
* of usr/src/test/libc is compiled that way.
*/
#include <float.h>
#include <fenv.h>
#include <stdio.h>
#include <strings.h>
#include "test_common.h"
/*
* Returns negative if snprintf() fails. Returns 0 upon
* successful execution of the test, return 1 upon a failure.
* Spews output if verbose is TRUE.
*/
int
run_one(test_t t, int i, int j, int precision, boolean_t verbose)
{
const int size = 100;
char buffer[size], check[size];
double val;
int status;
val = (double)(0.0 + j) / i;
/* first get max precision for control check */
status = snprintf(check, size, "%+-.*f", DECIMAL_DIG, val);
if (status < 0) {
test_failed(t, "Max precision snprintf() "
"(i = %d, j = %d) returned %d\n", i, j, status);
return (status);
}
/* then get specific precision */
status = snprintf(buffer, size, "%+-#.*f", precision, val);
if (status < 0) {
test_failed(t, "Specific precision snprintf() "
"(i = %d, j = %d, precision = %d) returned %d\n", i, j,
precision, status);
return (status);
}
if (strlen(check) > strlen(buffer) &&
strncmp(buffer, check, strlen(buffer))) {
/* last check if correctly rounded up */
if (check[strlen(buffer)] < '5' &&
buffer[strlen(buffer) - 1] > check[strlen(buffer) - 1]) {
if (verbose)
(void) printf("failure:f precision %d "
"for %02d/%02d => %s (%s)\n",
precision, j, i, buffer, check);
return (1);
}
}
return (0);
}
int
main(int argc, char *argv[])
{
int status, i, j, precision;
int failures = 0;
int runs = 0;
test_t t;
/* NOTE: Any argument after the command enables "VERBOSE" mode. */
boolean_t verbose = (argc > 1);
t = test_start("*printf() floating-point rounding tests.");
(void) fesetround(FE_TONEAREST);
for (j = 1; j < 100; j++) {
for (i = 2; i < 100; i++) {
for (precision = DBL_DIG - 1; precision <= DECIMAL_DIG;
precision++) {
runs++;
status = run_one(t, i, j, precision, verbose);
if (status < 0)
return (status);
failures += status;
}
}
}
if (failures > 0) {
test_failed(t, "Tests failed %d times out of %d attempts.\n"
"Run '%s full' to see the %d failures individually.\n",
failures, runs, argv[0], failures);
} else
test_passed(t);
return (0);
}