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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: tv.h,v 1.6 1999/12/10 23:42:04 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.h,v $ |
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33 | * Revision 1.6 1999/12/10 23:42:04 mdw |
34 | * Change header file guard names. |
35 | * |
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36 | * Revision 1.5 1999/05/21 22:13:12 mdw |
37 | * Moved most of the code into exported macros. The main functions now |
38 | * implemented using the macros. |
39 | * |
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40 | * Revision 1.4 1999/05/17 20:37:25 mdw |
41 | * New function `tv_addl' to add a literal to a time value. |
42 | * |
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43 | * Revision 1.3 1999/05/06 19:51:36 mdw |
44 | * Reformatted the LGPL notice a little bit. |
45 | * |
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46 | * Revision 1.2 1999/05/05 18:50:31 mdw |
47 | * Change licensing conditions to LGPL. |
48 | * |
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49 | * Revision 1.1 1998/11/25 23:30:01 mdw |
50 | * New file. |
51 | * |
52 | */ |
53 | |
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54 | #ifndef MLIB_TV_H |
55 | #define MLIB_TV_H |
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56 | |
57 | #ifdef __cplusplus |
58 | extern "C" { |
59 | #endif |
60 | |
61 | /*----- Header files ------------------------------------------------------*/ |
62 | |
63 | #include <sys/time.h> |
64 | |
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65 | /*----- A macro to make reading easier ------------------------------------*/ |
66 | |
67 | #define MILLION 1000000 |
68 | |
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69 | /*----- Functions provided ------------------------------------------------*/ |
70 | |
71 | /* --- @tv_add@ --- * |
72 | * |
73 | * Arguments: @struct timeval *dst@ = destination block |
74 | * @const struct timeval *a, *b@ = source blocks |
75 | * |
76 | * Returns: --- |
77 | * |
78 | * Use: Adds two timevals. |
79 | */ |
80 | |
81 | extern void tv_add(struct timeval */*dst*/, |
82 | const struct timeval */*a*/, |
83 | const struct timeval */*b*/); |
84 | |
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85 | #define TV_ADD(dst, a, b) TV_ADDL(dst, a, (b)->tv_sec, (b)->tv_usec) |
86 | |
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87 | /* --- @tv_addl@ --- * |
88 | * |
89 | * Arguments: @struct timeval *dst@ = destination block |
90 | * @const struct timeval *a@ = source blocks |
91 | * @time_t sec@, @unsigned long usec@ = time to add |
92 | * |
93 | * Returns: --- |
94 | * |
95 | * Use: Adds a literal time in seconds and microseconds. |
96 | */ |
97 | |
98 | extern void tv_addl(struct timeval */*dst*/, |
99 | const struct timeval */*a*/, |
100 | time_t /*sec*/, unsigned long /*usec*/); |
101 | |
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102 | #define TV_ADDL(dst, a, sec, usec) do { \ |
103 | (dst)->tv_sec = (a)->tv_sec + (sec); \ |
104 | (dst)->tv_usec = (a)->tv_usec + (usec); \ |
105 | if ((dst)->tv_usec >= MILLION) { \ |
106 | (dst)->tv_usec -= MILLION; \ |
107 | (dst)->tv_sec++; \ |
108 | } \ |
109 | } while (0) |
110 | |
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111 | /* --- @tv_sub@ --- * |
112 | * |
113 | * Arguments: @struct timeval *dst@ = destination block |
114 | * @const struct timeval *a, *b@ = source blocks |
115 | * |
116 | * Returns: --- |
117 | * |
118 | * Use: Subtracts two timevals. |
119 | */ |
120 | |
121 | extern void tv_sub(struct timeval */*dst*/, |
122 | const struct timeval */*a*/, |
123 | const struct timeval */*b*/); |
124 | |
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125 | #define TV_SUB(dst, a, b) TV_SUBL(dst, a, (b)->tv_sec, (b)->tv_usec) |
126 | |
127 | /* --- @tv_subl@ --- * |
128 | * |
129 | * Arguments: @struct timeval *dst@ = destination block |
130 | * @const struct timeval *a@ = source blocks |
131 | * @time_t sec@, @unsigned long usec@ = time to subtract |
132 | * |
133 | * Returns: --- |
134 | * |
135 | * Use: Subtracts a literal time in seconds and microseconds. |
136 | */ |
137 | |
138 | extern void tv_subl(struct timeval */*dst*/, |
139 | const struct timeval */*a*/, |
140 | time_t /*sec*/, unsigned long /*usec*/); |
141 | |
142 | #define TV_SUBL(dst, a, sec, usec) do { \ |
143 | (dst)->tv_sec = (a)->tv_sec - (sec); \ |
144 | if ((a)->tv_usec >= (usec)) \ |
145 | (dst)->tv_usec = (a)->tv_usec - (usec); \ |
146 | else { \ |
147 | (dst)->tv_usec = (a)->tv_usec + MILLION - (usec); \ |
148 | (dst)->tv_sec--; \ |
149 | } \ |
150 | } while (0) |
151 | |
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152 | /* --- @tv_cmp@ --- * |
153 | * |
154 | * Arguments: @const struct timeval *a, *b@ = source blocks |
155 | * |
156 | * Returns: Less than, equal to, or greater than zero. |
157 | * |
158 | * Use: Compares two timevals. |
159 | */ |
160 | |
161 | extern int tv_cmp(const struct timeval */*a*/, |
162 | const struct timeval */*b*/); |
163 | |
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164 | #define TV_CMP(a, op, b) ((a)->tv_sec == (b)->tv_sec ? \ |
165 | (a)->tv_usec op (b)->tv_usec : \ |
166 | (a)->tv_sec op (b)->tv_sec) |
167 | |
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168 | /*----- That's all, folks -------------------------------------------------*/ |
169 | |
170 | #ifdef __cplusplus |
171 | } |
172 | #endif |
173 | |
174 | #endif |