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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: tv.c,v 1.5 1999/05/21 22:13:12 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 1.5 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 | * |
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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 | * |
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41 | * Revision 1.3 1999/05/06 19:51:36 mdw |
42 | * Reformatted the LGPL notice a little bit. |
43 | * |
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44 | * Revision 1.2 1999/05/05 18:50:31 mdw |
45 | * Change licensing conditions to LGPL. |
46 | * |
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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 | { |
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72 | TV_ADD(dst, a, b); |
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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 | { |
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89 | TV_ADDL(dst, a, sec, usec); |
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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 | { |
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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); |
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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 | { |
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136 | /* --- This is more awkward than the case the macro deals with --- */ |
137 | |
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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 -------------------------------------------------*/ |