GCOV - Varnish Cache


/*-
 * Copyright 2025 UPLEX - Nils Goroll Systemoptimierung
 * All rights reserved.
 *
 * Author: Nils Goroll <slink@uplex.de>
 *
 * Includes code by Bruce Dawson
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "config.h"

#include <float.h>
#include <math.h>

#include "cache/cache.h"
#include "vcc_math_if.h"

// macros in math.h code are generic-ish across float/double/long double
//lint --e{506} Constant value Boolean
//lint --e{736} Loss of precision

/*
 * this is AlmostEqualRelativeAndAbs() by Bruce Dawson
 * https://randomascii.wordpress.com/2012/02/25/comparing-floating-point-numbers-2012-edition/
 */
VCL_BOOL
vmod_approx(VRT_CTX, VCL_REAL a, VCL_REAL b, VCL_REAL maxDiff, VCL_REAL maxRelDiff)
{
        (void)ctx;

        if (fpclassify(maxDiff) == FP_ZERO)
                maxDiff = 4 * DBL_EPSILON;

        if (fpclassify(maxRelDiff) == FP_ZERO)
                maxRelDiff = DBL_EPSILON;

        VCL_REAL diff = fabs(a - b);
        if (diff <= maxDiff)
                return (1);

        a = fabs(a);
        b = fabs(b);
        VCL_REAL largest = (b > a) ? b : a;

        if (diff <= largest * maxRelDiff)
                return (1);

        return (0);
}

static int
valid_fmt(VCL_STRING fmt)
{
        if (fmt == NULL || *fmt != '%')
                return (0);
        fmt++;
        if (*fmt == '.') {
                fmt++;
                while (*fmt >= '0' && *fmt <= '9')
                        fmt++;
        }
        switch (*fmt) {
        case 'a':
        case 'A':
        case 'e':
        case 'E':
        case 'f':
        case 'F':
        case 'g':
        case 'G':
                return (1);
        default:
                return (0);
        }
}

VCL_STRING
vmod_strfromd(VRT_CTX, VCL_STRING fmt, VCL_REAL fp)
{
        CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);

        if (! valid_fmt(fmt)) {
                VRT_fail(ctx, "math.strfromd(\"%s\", ...): Invalid format",
                    fmt ? fmt : "<NULL>");
                return (NULL);
        }

        return (WS_Printf(ctx->ws, fmt, fp));
}

		varnish-cache/vmod/vmod_math_util.c
0		/*-
1		* Copyright 2025 UPLEX - Nils Goroll Systemoptimierung
2		* All rights reserved.
3		*
4		* Author: Nils Goroll <slink@uplex.de>
5		*
6		* Includes code by Bruce Dawson
7		*
8		* SPDX-License-Identifier: BSD-2-Clause
9		*
10		* Redistribution and use in source and binary forms, with or without
11		* modification, are permitted provided that the following conditions
12		* are met:
13		* 1. Redistributions of source code must retain the above copyright
14		* notice, this list of conditions and the following disclaimer.
15		* 2. Redistributions in binary form must reproduce the above copyright
16		* notice, this list of conditions and the following disclaimer in the
17		* documentation and/or other materials provided with the distribution.
18		*
19		* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20		* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21		* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22		* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
23		* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24		* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25		* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26		* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27		* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28		* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29		* SUCH DAMAGE.
30		*/
31
32		#include "config.h"
33
34		#include <float.h>
35		#include <math.h>
36
37		#include "cache/cache.h"
38		#include "vcc_math_if.h"
39
40		// macros in math.h code are generic-ish across float/double/long double
41		//lint --e{506} Constant value Boolean
42		//lint --e{736} Loss of precision
43
44		/*
45		* this is AlmostEqualRelativeAndAbs() by Bruce Dawson
46		* https://randomascii.wordpress.com/2012/02/25/comparing-floating-point-numbers-2012-edition/
47		*/
48		VCL_BOOL
49	80	vmod_approx(VRT_CTX, VCL_REAL a, VCL_REAL b, VCL_REAL maxDiff, VCL_REAL maxRelDiff)
50		{
51	80	(void)ctx;
52
53	80	if (fpclassify(maxDiff) == FP_ZERO)
54	80	maxDiff = 4 * DBL_EPSILON;
55
56	80	if (fpclassify(maxRelDiff) == FP_ZERO)
57	80	maxRelDiff = DBL_EPSILON;
58
59	80	VCL_REAL diff = fabs(a - b);
60	80	if (diff <= maxDiff)
61	40	return (1);
62
63	40	a = fabs(a);
64	40	b = fabs(b);
65	40	VCL_REAL largest = (b > a) ? b : a;
66
67	40	if (diff <= largest * maxRelDiff)
68	40	return (1);
69
70	0	return (0);
71	80	}
72
73		static int
74	320	valid_fmt(VCL_STRING fmt)
75		{
76	320	if (fmt == NULL \|\| *fmt != '%')
77	0	return (0);
78	320	fmt++;
79	320	if (*fmt == '.') {
80	160	fmt++;
81	480	while (fmt >= '0' && fmt <= '9')
82	320	fmt++;
83	160	}
84	320	switch (*fmt) {
85		case 'a':
86		case 'A':
87		case 'e':
88		case 'E':
89		case 'f':
90		case 'F':
91		case 'g':
92		case 'G':
93	280	return (1);
94		default:
95	40	return (0);
96		}
97	320	}
98
99		VCL_STRING
100	320	vmod_strfromd(VRT_CTX, VCL_STRING fmt, VCL_REAL fp)
101		{
102	320	CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
103
104	320	if (! valid_fmt(fmt)) {
105	80	VRT_fail(ctx, "math.strfromd(\"%s\", ...): Invalid format",
106	40	fmt ? fmt : "<NULL>");
107	40	return (NULL);
108		}
109
110	280	return (WS_Printf(ctx->ws, fmt, fp));
111	320	}