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annotate lib/log.c @ 17587:344018b6e5d7

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maint: update copyright I ran 'make update-copyright'. Signed-off-by: Eric Blake <eblake@redhat.com>
author Eric Blake <eblake@redhat.com>
date Wed, 01 Jan 2014 00:04:40 -0700
parents e542fd46ad6f
children ab58d4870664
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1 /* Logarithm.
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2 Copyright (C) 2012-2014 Free Software Foundation, Inc.
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3
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4 This program is free software: you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 3 of the License, or
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7 (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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16
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17 #include <config.h>
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18
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19 /* Specification. */
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20 #include <math.h>
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21
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22 double
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23 log (double x)
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24 #undef log
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25 {
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26 if (x <= 0.0)
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27 {
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28 /* Work around the OSF/1 5.1 bug. */
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29 if (x == 0.0)
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30 /* Return -Infinity. */
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31 return -1.0 / 0.0;
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32 /* Work around the NetBSD 5.1, Solaris 11 2011-11 bug. */
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33 else /* x < 0.0 */
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34 /* Return NaN. */
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35 return 0.0 / 0.0;
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36 }
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37 return log (x);
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38 }