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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: tv.c,v 1.6 2004/04/08 01:36:13 mdw Exp $ |
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4 | * |
5 | * Manipulation of timeval structures |
6 | * |
7 | * (c) 1998 Straylight/Edgeware |
8 | */ |
9 | |
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10 | /*----- Licensing notice --------------------------------------------------* |
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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 | * |
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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 | |
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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 | { |
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50 | TV_ADD(dst, a, b); |
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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 | { |
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67 | TV_ADDL(dst, a, sec, usec); |
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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 | { |
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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); |
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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 | { |
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114 | /* --- This is more awkward than the case the macro deals with --- */ |
115 | |
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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 -------------------------------------------------*/ |