| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: tv.c,v 1.6 2004/04/08 01:36:13 mdw Exp $ |
| 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 |
| 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. |
| 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 |
| 22 | * GNU Library General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU Library General Public |
| 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. |
| 28 | */ |
| 29 | |
| 30 | /*----- Header files ------------------------------------------------------*/ |
| 31 | |
| 32 | #include <sys/time.h> |
| 33 | #include "tv.h" |
| 34 | |
| 35 | /*----- Main code ---------------------------------------------------------*/ |
| 36 | |
| 37 | /* --- @tv_add@ --- * |
| 38 | * |
| 39 | * Arguments: @struct timeval *dst@ = destination block |
| 40 | * @const struct timeval *a, *b@ = source blocks |
| 41 | * |
| 42 | * Returns: --- |
| 43 | * |
| 44 | * Use: Adds two timevals. |
| 45 | */ |
| 46 | |
| 47 | void tv_add(struct timeval *dst, |
| 48 | const struct timeval *a, const struct timeval *b) |
| 49 | { |
| 50 | TV_ADD(dst, a, b); |
| 51 | } |
| 52 | |
| 53 | /* --- @tv_addl@ --- * |
| 54 | * |
| 55 | * Arguments: @struct timeval *dst@ = destination block |
| 56 | * @const struct timeval *a@ = source blocks |
| 57 | * @time_t sec@, @unsigned long usec@ = time to add |
| 58 | * |
| 59 | * Returns: --- |
| 60 | * |
| 61 | * Use: Adds a literal time in seconds and microseconds. |
| 62 | */ |
| 63 | |
| 64 | void tv_addl(struct timeval *dst, const struct timeval *a, |
| 65 | time_t sec, unsigned long usec) |
| 66 | { |
| 67 | TV_ADDL(dst, a, sec, usec); |
| 68 | } |
| 69 | |
| 70 | /* --- @tv_sub@ --- * |
| 71 | * |
| 72 | * Arguments: @struct timeval *dst@ = destination block |
| 73 | * @const struct timeval *a, *b@ = source blocks |
| 74 | * |
| 75 | * Returns: --- |
| 76 | * |
| 77 | * Use: Subtracts two timevals. |
| 78 | */ |
| 79 | |
| 80 | void tv_sub(struct timeval *dst, |
| 81 | const struct timeval *a, const struct timeval *b) |
| 82 | { |
| 83 | TV_SUB(dst, a, b); |
| 84 | } |
| 85 | |
| 86 | /* --- @tv_subl@ --- * |
| 87 | * |
| 88 | * Arguments: @struct timeval *dst@ = destination block |
| 89 | * @const struct timeval *a@ = source blocks |
| 90 | * @time_t sec@, @unsigned long usec@ = time to subtract |
| 91 | * |
| 92 | * Returns: --- |
| 93 | * |
| 94 | * Use: Subtracts a literal time in seconds and microseconds. |
| 95 | */ |
| 96 | |
| 97 | void tv_subl(struct timeval *dst, const struct timeval *a, |
| 98 | time_t sec, unsigned long usec) |
| 99 | { |
| 100 | TV_SUBL(dst, a, sec, usec); |
| 101 | } |
| 102 | |
| 103 | /* --- @tv_cmp@ --- * |
| 104 | * |
| 105 | * Arguments: @const struct timeval *a, *b@ = source blocks |
| 106 | * |
| 107 | * Returns: Less than, equal to, or greater than zero. |
| 108 | * |
| 109 | * Use: Compares two timevals. |
| 110 | */ |
| 111 | |
| 112 | int tv_cmp(const struct timeval *a, const struct timeval *b) |
| 113 | { |
| 114 | /* --- This is more awkward than the case the macro deals with --- */ |
| 115 | |
| 116 | if (a->tv_sec > b->tv_sec) |
| 117 | return (1); |
| 118 | else if (a->tv_sec < b->tv_sec) |
| 119 | return (-1); |
| 120 | else if (a->tv_usec > b->tv_usec) |
| 121 | return (1); |
| 122 | else if (a->tv_usec < b->tv_usec) |
| 123 | return (-1); |
| 124 | else |
| 125 | return (0); |
| 126 | } |
| 127 | |
| 128 | /*----- That's all, folks -------------------------------------------------*/ |