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annotate lib/timespec-add.c @ 17409:26a04e61f560

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stdio: use __REDIRECT for fwrite, fwrite_unlocked * lib/stdio.in.h (fwrite): When working around bug 11959, use __REDIRECT rather than '#define fwrite(...) ... fwrite (...) ...'. This is a more-targeted way to fix the -Wunused-value issue with clang, and it works with GCC too. Problem with targeting reported by Eric Blake in <http://lists.gnu.org/archive/html/bug-gnulib/2013-05/msg00067.html>. (fwrite_unlocked): Treat like fwrite. I ran into this issue while debugging the fwrite issue.
author Paul Eggert <eggert@cs.ucla.edu>
date Wed, 15 May 2013 15:52:42 -0700
parents e542fd46ad6f
children
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1 /* Add two struct timespec values.
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2
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e542fd46ad6f maint: update all copyright year number ranges
Eric Blake <eblake@redhat.com>
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3 Copyright (C) 2011-2013 Free Software Foundation, Inc.
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4
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 3 of the License, or
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8 (at your option) any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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17
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18 /* Written by Paul Eggert. */
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19
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20 /* Return the sum of two timespec values A and B. On overflow, return
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21 an extremal value. This assumes 0 <= tv_nsec <= 999999999. */
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22
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23 #include <config.h>
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24 #include "timespec.h"
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25
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26 #include "intprops.h"
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27
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28 struct timespec
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29 timespec_add (struct timespec a, struct timespec b)
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30 {
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31 struct timespec r;
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32 time_t rs = a.tv_sec;
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33 time_t bs = b.tv_sec;
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34 int ns = a.tv_nsec + b.tv_nsec;
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35 int nsd = ns - 1000000000;
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36 int rns = ns;
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37
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38 if (0 <= nsd)
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39 {
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40 rns = nsd;
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41 if (rs == TYPE_MAXIMUM (time_t))
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42 {
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43 if (0 <= bs)
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44 goto high_overflow;
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45 bs++;
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46 }
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47 else
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48 rs++;
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49 }
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50
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51 if (INT_ADD_OVERFLOW (rs, bs))
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52 {
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53 if (rs < 0)
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54 {
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55 rs = TYPE_MINIMUM (time_t);
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56 rns = 0;
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57 }
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58 else
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59 {
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60 high_overflow:
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61 rs = TYPE_MAXIMUM (time_t);
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62 rns = 999999999;
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63 }
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64 }
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65 else
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66 rs += bs;
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67
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68 r.tv_sec = rs;
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69 r.tv_nsec = rns;
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70 return r;
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71 }