| 1 | /*
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| 2 | * Copyright (c) 2018 CZ.NIC, z.s.p.o.
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | #include <math.h>
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| 30 | #include <stdarg.h>
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| 31 |
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| 32 | /**
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| 33 | * Fallback symbol used when code including <math.h> is compiled with something
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| 34 | * other than GCC or Clang. The function itself must be built with GCC or Clang.
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| 35 | */
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| 36 | int __fcompare(size_t sz1, size_t sz2, ...)
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| 37 | {
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| 38 | va_list ap;
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| 39 | va_start(ap, sz2);
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| 40 |
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| 41 | long double val1;
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| 42 | long double val2;
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| 43 |
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| 44 | switch (sz1) {
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| 45 | case 4:
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| 46 | val1 = (long double) va_arg(ap, double);
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| 47 | break;
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| 48 | case 8:
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| 49 | val1 = (long double) va_arg(ap, double);
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| 50 | break;
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| 51 | default:
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| 52 | val1 = va_arg(ap, long double);
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| 53 | break;
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| 54 | }
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| 55 |
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| 56 | switch (sz2) {
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| 57 | case 4:
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| 58 | val2 = (long double) va_arg(ap, double);
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| 59 | break;
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| 60 | case 8:
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| 61 | val2 = (long double) va_arg(ap, double);
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| 62 | break;
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| 63 | default:
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| 64 | val2 = va_arg(ap, long double);
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| 65 | break;
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| 66 | }
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| 67 |
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| 68 | va_end(ap);
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| 69 |
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| 70 | if (isgreaterequal(val1, val2)) {
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| 71 | if (isgreater(val1, val2))
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| 72 | return __FCOMPARE_GREATER;
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| 73 | else
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| 74 | return __FCOMPARE_EQUAL;
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| 75 | } else {
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| 76 | if (isless(val1, val2))
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| 77 | return __FCOMPARE_LESS;
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| 78 | else
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| 79 | return 0;
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| 80 | }
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| 81 | }
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| 82 |
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