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1 | /* -*-c-*- |
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2 | * |
3 | * Manipulation of timeval structures |
4 | * |
5 | * (c) 1998 Straylight/Edgeware |
6 | */ |
7 | |
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8 | /*----- Licensing notice --------------------------------------------------* |
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9 | * |
10 | * This file is part of the mLib utilities library. |
11 | * |
12 | * mLib is free software; you can redistribute it and/or modify |
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13 | * it under the terms of the GNU Library General Public License as |
14 | * published by the Free Software Foundation; either version 2 of the |
15 | * License, or (at your option) any later version. |
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16 | * |
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17 | * mLib is distributed in the hope that it will be useful, |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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20 | * GNU Library General Public License for more details. |
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21 | * |
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22 | * You should have received a copy of the GNU Library General Public |
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23 | * License along with mLib; if not, write to the Free |
24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
25 | * MA 02111-1307, USA. |
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26 | */ |
27 | |
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28 | /*----- Header files ------------------------------------------------------*/ |
29 | |
30 | #include <sys/time.h> |
31 | #include "tv.h" |
32 | |
33 | /*----- Main code ---------------------------------------------------------*/ |
34 | |
35 | /* --- @tv_add@ --- * |
36 | * |
37 | * Arguments: @struct timeval *dst@ = destination block |
38 | * @const struct timeval *a, *b@ = source blocks |
39 | * |
40 | * Returns: --- |
41 | * |
42 | * Use: Adds two timevals. |
43 | */ |
44 | |
45 | void tv_add(struct timeval *dst, |
46 | const struct timeval *a, const struct timeval *b) |
47 | { |
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48 | TV_ADD(dst, a, b); |
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49 | } |
50 | |
51 | /* --- @tv_addl@ --- * |
52 | * |
53 | * Arguments: @struct timeval *dst@ = destination block |
54 | * @const struct timeval *a@ = source blocks |
55 | * @time_t sec@, @unsigned long usec@ = time to add |
56 | * |
57 | * Returns: --- |
58 | * |
59 | * Use: Adds a literal time in seconds and microseconds. |
60 | */ |
61 | |
62 | void tv_addl(struct timeval *dst, const struct timeval *a, |
63 | time_t sec, unsigned long usec) |
64 | { |
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65 | TV_ADDL(dst, a, sec, usec); |
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66 | } |
67 | |
68 | /* --- @tv_sub@ --- * |
69 | * |
70 | * Arguments: @struct timeval *dst@ = destination block |
71 | * @const struct timeval *a, *b@ = source blocks |
72 | * |
73 | * Returns: --- |
74 | * |
75 | * Use: Subtracts two timevals. |
76 | */ |
77 | |
78 | void tv_sub(struct timeval *dst, |
79 | const struct timeval *a, const struct timeval *b) |
80 | { |
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81 | TV_SUB(dst, a, b); |
82 | } |
83 | |
84 | /* --- @tv_subl@ --- * |
85 | * |
86 | * Arguments: @struct timeval *dst@ = destination block |
87 | * @const struct timeval *a@ = source blocks |
88 | * @time_t sec@, @unsigned long usec@ = time to subtract |
89 | * |
90 | * Returns: --- |
91 | * |
92 | * Use: Subtracts a literal time in seconds and microseconds. |
93 | */ |
94 | |
95 | void tv_subl(struct timeval *dst, const struct timeval *a, |
96 | time_t sec, unsigned long usec) |
97 | { |
98 | TV_SUBL(dst, a, sec, usec); |
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99 | } |
100 | |
101 | /* --- @tv_cmp@ --- * |
102 | * |
103 | * Arguments: @const struct timeval *a, *b@ = source blocks |
104 | * |
105 | * Returns: Less than, equal to, or greater than zero. |
106 | * |
107 | * Use: Compares two timevals. |
108 | */ |
109 | |
110 | int tv_cmp(const struct timeval *a, const struct timeval *b) |
111 | { |
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112 | /* --- This is more awkward than the case the macro deals with --- */ |
113 | |
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114 | if (a->tv_sec > b->tv_sec) |
115 | return (1); |
116 | else if (a->tv_sec < b->tv_sec) |
117 | return (-1); |
118 | else if (a->tv_usec > b->tv_usec) |
119 | return (1); |
120 | else if (a->tv_usec < b->tv_usec) |
121 | return (-1); |
122 | else |
123 | return (0); |
124 | } |
125 | |
126 | /*----- That's all, folks -------------------------------------------------*/ |