| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: tv.c,v 1.5 1999/05/21 22:13:12 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 | /*----- Revision history --------------------------------------------------* |
| 31 | * |
| 32 | * $Log: tv.c,v $ |
| 33 | * Revision 1.5 1999/05/21 22:13:12 mdw |
| 34 | * Moved most of the code into exported macros. The main functions now |
| 35 | * implemented using the macros. |
| 36 | * |
| 37 | * Revision 1.4 1999/05/17 20:37:52 mdw |
| 38 | * New function `tv_addl' to add a literal to a time value. Use magical |
| 39 | * `MILLION' constant in place of 1000000 for ease of reading. |
| 40 | * |
| 41 | * Revision 1.3 1999/05/06 19:51:36 mdw |
| 42 | * Reformatted the LGPL notice a little bit. |
| 43 | * |
| 44 | * Revision 1.2 1999/05/05 18:50:31 mdw |
| 45 | * Change licensing conditions to LGPL. |
| 46 | * |
| 47 | * Revision 1.1 1998/11/25 23:30:01 mdw |
| 48 | * New file. |
| 49 | * |
| 50 | */ |
| 51 | |
| 52 | /*----- Header files ------------------------------------------------------*/ |
| 53 | |
| 54 | #include <sys/time.h> |
| 55 | #include "tv.h" |
| 56 | |
| 57 | /*----- Main code ---------------------------------------------------------*/ |
| 58 | |
| 59 | /* --- @tv_add@ --- * |
| 60 | * |
| 61 | * Arguments: @struct timeval *dst@ = destination block |
| 62 | * @const struct timeval *a, *b@ = source blocks |
| 63 | * |
| 64 | * Returns: --- |
| 65 | * |
| 66 | * Use: Adds two timevals. |
| 67 | */ |
| 68 | |
| 69 | void tv_add(struct timeval *dst, |
| 70 | const struct timeval *a, const struct timeval *b) |
| 71 | { |
| 72 | TV_ADD(dst, a, b); |
| 73 | } |
| 74 | |
| 75 | /* --- @tv_addl@ --- * |
| 76 | * |
| 77 | * Arguments: @struct timeval *dst@ = destination block |
| 78 | * @const struct timeval *a@ = source blocks |
| 79 | * @time_t sec@, @unsigned long usec@ = time to add |
| 80 | * |
| 81 | * Returns: --- |
| 82 | * |
| 83 | * Use: Adds a literal time in seconds and microseconds. |
| 84 | */ |
| 85 | |
| 86 | void tv_addl(struct timeval *dst, const struct timeval *a, |
| 87 | time_t sec, unsigned long usec) |
| 88 | { |
| 89 | TV_ADDL(dst, a, sec, usec); |
| 90 | } |
| 91 | |
| 92 | /* --- @tv_sub@ --- * |
| 93 | * |
| 94 | * Arguments: @struct timeval *dst@ = destination block |
| 95 | * @const struct timeval *a, *b@ = source blocks |
| 96 | * |
| 97 | * Returns: --- |
| 98 | * |
| 99 | * Use: Subtracts two timevals. |
| 100 | */ |
| 101 | |
| 102 | void tv_sub(struct timeval *dst, |
| 103 | const struct timeval *a, const struct timeval *b) |
| 104 | { |
| 105 | TV_SUB(dst, a, b); |
| 106 | } |
| 107 | |
| 108 | /* --- @tv_subl@ --- * |
| 109 | * |
| 110 | * Arguments: @struct timeval *dst@ = destination block |
| 111 | * @const struct timeval *a@ = source blocks |
| 112 | * @time_t sec@, @unsigned long usec@ = time to subtract |
| 113 | * |
| 114 | * Returns: --- |
| 115 | * |
| 116 | * Use: Subtracts a literal time in seconds and microseconds. |
| 117 | */ |
| 118 | |
| 119 | void tv_subl(struct timeval *dst, const struct timeval *a, |
| 120 | time_t sec, unsigned long usec) |
| 121 | { |
| 122 | TV_SUBL(dst, a, sec, usec); |
| 123 | } |
| 124 | |
| 125 | /* --- @tv_cmp@ --- * |
| 126 | * |
| 127 | * Arguments: @const struct timeval *a, *b@ = source blocks |
| 128 | * |
| 129 | * Returns: Less than, equal to, or greater than zero. |
| 130 | * |
| 131 | * Use: Compares two timevals. |
| 132 | */ |
| 133 | |
| 134 | int tv_cmp(const struct timeval *a, const struct timeval *b) |
| 135 | { |
| 136 | /* --- This is more awkward than the case the macro deals with --- */ |
| 137 | |
| 138 | if (a->tv_sec > b->tv_sec) |
| 139 | return (1); |
| 140 | else if (a->tv_sec < b->tv_sec) |
| 141 | return (-1); |
| 142 | else if (a->tv_usec > b->tv_usec) |
| 143 | return (1); |
| 144 | else if (a->tv_usec < b->tv_usec) |
| 145 | return (-1); |
| 146 | else |
| 147 | return (0); |
| 148 | } |
| 149 | |
| 150 | /*----- That's all, folks -------------------------------------------------*/ |