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1 | /* -*-c-*- |
2 | * |
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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 | #ifndef MLIB_TV_H |
29 | #define MLIB_TV_H |
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30 | |
31 | #ifdef __cplusplus |
32 | extern "C" { |
33 | #endif |
34 | |
35 | /*----- Header files ------------------------------------------------------*/ |
36 | |
37 | #include <sys/time.h> |
38 | |
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39 | /*----- A macro to make reading easier ------------------------------------*/ |
40 | |
41 | #define MILLION 1000000 |
42 | |
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43 | /*----- Functions provided ------------------------------------------------*/ |
44 | |
45 | /* --- @tv_add@ --- * |
46 | * |
47 | * Arguments: @struct timeval *dst@ = destination block |
48 | * @const struct timeval *a, *b@ = source blocks |
49 | * |
50 | * Returns: --- |
51 | * |
52 | * Use: Adds two timevals. |
53 | */ |
54 | |
55 | extern void tv_add(struct timeval */*dst*/, |
56 | const struct timeval */*a*/, |
57 | const struct timeval */*b*/); |
58 | |
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59 | #define TV_ADD(dst, a, b) TV_ADDL(dst, a, (b)->tv_sec, (b)->tv_usec) |
60 | |
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61 | /* --- @tv_addl@ --- * |
62 | * |
63 | * Arguments: @struct timeval *dst@ = destination block |
64 | * @const struct timeval *a@ = source blocks |
65 | * @time_t sec@, @unsigned long usec@ = time to add |
66 | * |
67 | * Returns: --- |
68 | * |
69 | * Use: Adds a literal time in seconds and microseconds. |
70 | */ |
71 | |
72 | extern void tv_addl(struct timeval */*dst*/, |
73 | const struct timeval */*a*/, |
74 | time_t /*sec*/, unsigned long /*usec*/); |
75 | |
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76 | #define TV_ADDL(dst, a, sec, usec) do { \ |
77 | (dst)->tv_sec = (a)->tv_sec + (sec); \ |
78 | (dst)->tv_usec = (a)->tv_usec + (usec); \ |
79 | if ((dst)->tv_usec >= MILLION) { \ |
80 | (dst)->tv_usec -= MILLION; \ |
81 | (dst)->tv_sec++; \ |
82 | } \ |
83 | } while (0) |
84 | |
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85 | /* --- @tv_sub@ --- * |
86 | * |
87 | * Arguments: @struct timeval *dst@ = destination block |
88 | * @const struct timeval *a, *b@ = source blocks |
89 | * |
90 | * Returns: --- |
91 | * |
92 | * Use: Subtracts two timevals. |
93 | */ |
94 | |
95 | extern void tv_sub(struct timeval */*dst*/, |
96 | const struct timeval */*a*/, |
97 | const struct timeval */*b*/); |
98 | |
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99 | #define TV_SUB(dst, a, b) TV_SUBL(dst, a, (b)->tv_sec, (b)->tv_usec) |
100 | |
101 | /* --- @tv_subl@ --- * |
102 | * |
103 | * Arguments: @struct timeval *dst@ = destination block |
104 | * @const struct timeval *a@ = source blocks |
105 | * @time_t sec@, @unsigned long usec@ = time to subtract |
106 | * |
107 | * Returns: --- |
108 | * |
109 | * Use: Subtracts a literal time in seconds and microseconds. |
110 | */ |
111 | |
112 | extern void tv_subl(struct timeval */*dst*/, |
113 | const struct timeval */*a*/, |
114 | time_t /*sec*/, unsigned long /*usec*/); |
115 | |
116 | #define TV_SUBL(dst, a, sec, usec) do { \ |
117 | (dst)->tv_sec = (a)->tv_sec - (sec); \ |
118 | if ((a)->tv_usec >= (usec)) \ |
119 | (dst)->tv_usec = (a)->tv_usec - (usec); \ |
120 | else { \ |
121 | (dst)->tv_usec = (a)->tv_usec + MILLION - (usec); \ |
122 | (dst)->tv_sec--; \ |
123 | } \ |
124 | } while (0) |
125 | |
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126 | /* --- @tv_cmp@ --- * |
127 | * |
128 | * Arguments: @const struct timeval *a, *b@ = source blocks |
129 | * |
130 | * Returns: Less than, equal to, or greater than zero. |
131 | * |
132 | * Use: Compares two timevals. |
133 | */ |
134 | |
135 | extern int tv_cmp(const struct timeval */*a*/, |
136 | const struct timeval */*b*/); |
137 | |
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138 | #define TV_CMP(a, op, b) ((a)->tv_sec == (b)->tv_sec ? \ |
139 | (a)->tv_usec op (b)->tv_usec : \ |
140 | (a)->tv_sec op (b)->tv_sec) |
141 | |
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142 | /*----- That's all, folks -------------------------------------------------*/ |
143 | |
144 | #ifdef __cplusplus |
145 | } |
146 | #endif |
147 | |
148 | #endif |