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1 | /* -*-c-*- |
| 2 | * |
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3 | * $Id: tv.c,v 1.3 1999/05/06 19:51:36 mdw Exp $ |
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4 | * |
| 5 | * Manipulation of timeval structures |
| 6 | * |
| 7 | * (c) 1998 Straylight/Edgeware |
| 8 | */ |
| 9 | |
| 10 | /*----- Licensing notice --------------------------------------------------* |
| 11 | * |
| 12 | * This file is part of the mLib utilities library. |
| 13 | * |
| 14 | * mLib is free software; you can redistribute it and/or modify |
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15 | * it under the terms of the GNU Library General Public License as |
| 16 | * published by the Free Software Foundation; either version 2 of the |
| 17 | * License, or (at your option) any later version. |
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18 | * |
| 19 | * mLib is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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22 | * GNU Library General Public License for more details. |
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23 | * |
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24 | * You should have received a copy of the GNU Library General Public |
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25 | * License along with mLib; if not, write to the Free |
| 26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
| 27 | * MA 02111-1307, USA. |
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28 | */ |
| 29 | |
| 30 | /*----- Revision history --------------------------------------------------* |
| 31 | * |
| 32 | * $Log: tv.c,v $ |
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33 | * Revision 1.3 1999/05/06 19:51:36 mdw |
| 34 | * Reformatted the LGPL notice a little bit. |
| 35 | * |
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36 | * Revision 1.2 1999/05/05 18:50:31 mdw |
| 37 | * Change licensing conditions to LGPL. |
| 38 | * |
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39 | * Revision 1.1 1998/11/25 23:30:01 mdw |
| 40 | * New file. |
| 41 | * |
| 42 | */ |
| 43 | |
| 44 | /*----- Header files ------------------------------------------------------*/ |
| 45 | |
| 46 | #include <sys/time.h> |
| 47 | #include "tv.h" |
| 48 | |
| 49 | /*----- Main code ---------------------------------------------------------*/ |
| 50 | |
| 51 | /* --- @tv_add@ --- * |
| 52 | * |
| 53 | * Arguments: @struct timeval *dst@ = destination block |
| 54 | * @const struct timeval *a, *b@ = source blocks |
| 55 | * |
| 56 | * Returns: --- |
| 57 | * |
| 58 | * Use: Adds two timevals. |
| 59 | */ |
| 60 | |
| 61 | void tv_add(struct timeval *dst, |
| 62 | const struct timeval *a, const struct timeval *b) |
| 63 | { |
| 64 | dst->tv_sec = a->tv_sec + b->tv_sec; |
| 65 | dst->tv_usec = a->tv_usec + b->tv_usec; |
| 66 | if (dst->tv_usec >= 1000000) { |
| 67 | dst->tv_usec -= 1000000; |
| 68 | dst->tv_sec++; |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | /* --- @tv_sub@ --- * |
| 73 | * |
| 74 | * Arguments: @struct timeval *dst@ = destination block |
| 75 | * @const struct timeval *a, *b@ = source blocks |
| 76 | * |
| 77 | * Returns: --- |
| 78 | * |
| 79 | * Use: Subtracts two timevals. |
| 80 | */ |
| 81 | |
| 82 | void tv_sub(struct timeval *dst, |
| 83 | const struct timeval *a, const struct timeval *b) |
| 84 | { |
| 85 | dst->tv_sec = a->tv_sec - b->tv_sec; |
| 86 | if (a->tv_usec >= b->tv_usec) |
| 87 | dst->tv_usec = a->tv_usec - b->tv_usec; |
| 88 | else { |
| 89 | dst->tv_usec = a->tv_usec + 1000000 - b->tv_usec; |
| 90 | dst->tv_sec--; |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | /* --- @tv_cmp@ --- * |
| 95 | * |
| 96 | * Arguments: @const struct timeval *a, *b@ = source blocks |
| 97 | * |
| 98 | * Returns: Less than, equal to, or greater than zero. |
| 99 | * |
| 100 | * Use: Compares two timevals. |
| 101 | */ |
| 102 | |
| 103 | int tv_cmp(const struct timeval *a, const struct timeval *b) |
| 104 | { |
| 105 | if (a->tv_sec > b->tv_sec) |
| 106 | return (1); |
| 107 | else if (a->tv_sec < b->tv_sec) |
| 108 | return (-1); |
| 109 | else if (a->tv_usec > b->tv_usec) |
| 110 | return (1); |
| 111 | else if (a->tv_usec < b->tv_usec) |
| 112 | return (-1); |
| 113 | else |
| 114 | return (0); |
| 115 | } |
| 116 | |
| 117 | /*----- That's all, folks -------------------------------------------------*/ |
~mdw / mLib / blame