247239be |
1 | /* -*-c-*- |
2 | * |
9239a724 |
3 | * $Id: tv.h,v 1.5 1999/05/21 22:13:12 mdw Exp $ |
247239be |
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 |
c846879c |
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. |
247239be |
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 |
c846879c |
22 | * GNU Library General Public License for more details. |
247239be |
23 | * |
c846879c |
24 | * You should have received a copy of the GNU Library General Public |
0bd98442 |
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. |
247239be |
28 | */ |
29 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: tv.h,v $ |
9239a724 |
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 | * |
76a6457a |
37 | * Revision 1.4 1999/05/17 20:37:25 mdw |
38 | * New function `tv_addl' to add a literal to a time value. |
39 | * |
0bd98442 |
40 | * Revision 1.3 1999/05/06 19:51:36 mdw |
41 | * Reformatted the LGPL notice a little bit. |
42 | * |
c846879c |
43 | * Revision 1.2 1999/05/05 18:50:31 mdw |
44 | * Change licensing conditions to LGPL. |
45 | * |
247239be |
46 | * Revision 1.1 1998/11/25 23:30:01 mdw |
47 | * New file. |
48 | * |
49 | */ |
50 | |
51 | #ifndef TV_H |
52 | #define TV_H |
53 | |
54 | #ifdef __cplusplus |
55 | extern "C" { |
56 | #endif |
57 | |
58 | /*----- Header files ------------------------------------------------------*/ |
59 | |
60 | #include <sys/time.h> |
61 | |
9239a724 |
62 | /*----- A macro to make reading easier ------------------------------------*/ |
63 | |
64 | #define MILLION 1000000 |
65 | |
247239be |
66 | /*----- Functions provided ------------------------------------------------*/ |
67 | |
68 | /* --- @tv_add@ --- * |
69 | * |
70 | * Arguments: @struct timeval *dst@ = destination block |
71 | * @const struct timeval *a, *b@ = source blocks |
72 | * |
73 | * Returns: --- |
74 | * |
75 | * Use: Adds two timevals. |
76 | */ |
77 | |
78 | extern void tv_add(struct timeval */*dst*/, |
79 | const struct timeval */*a*/, |
80 | const struct timeval */*b*/); |
81 | |
9239a724 |
82 | #define TV_ADD(dst, a, b) TV_ADDL(dst, a, (b)->tv_sec, (b)->tv_usec) |
83 | |
76a6457a |
84 | /* --- @tv_addl@ --- * |
85 | * |
86 | * Arguments: @struct timeval *dst@ = destination block |
87 | * @const struct timeval *a@ = source blocks |
88 | * @time_t sec@, @unsigned long usec@ = time to add |
89 | * |
90 | * Returns: --- |
91 | * |
92 | * Use: Adds a literal time in seconds and microseconds. |
93 | */ |
94 | |
95 | extern void tv_addl(struct timeval */*dst*/, |
96 | const struct timeval */*a*/, |
97 | time_t /*sec*/, unsigned long /*usec*/); |
98 | |
9239a724 |
99 | #define TV_ADDL(dst, a, sec, usec) do { \ |
100 | (dst)->tv_sec = (a)->tv_sec + (sec); \ |
101 | (dst)->tv_usec = (a)->tv_usec + (usec); \ |
102 | if ((dst)->tv_usec >= MILLION) { \ |
103 | (dst)->tv_usec -= MILLION; \ |
104 | (dst)->tv_sec++; \ |
105 | } \ |
106 | } while (0) |
107 | |
247239be |
108 | /* --- @tv_sub@ --- * |
109 | * |
110 | * Arguments: @struct timeval *dst@ = destination block |
111 | * @const struct timeval *a, *b@ = source blocks |
112 | * |
113 | * Returns: --- |
114 | * |
115 | * Use: Subtracts two timevals. |
116 | */ |
117 | |
118 | extern void tv_sub(struct timeval */*dst*/, |
119 | const struct timeval */*a*/, |
120 | const struct timeval */*b*/); |
121 | |
9239a724 |
122 | #define TV_SUB(dst, a, b) TV_SUBL(dst, a, (b)->tv_sec, (b)->tv_usec) |
123 | |
124 | /* --- @tv_subl@ --- * |
125 | * |
126 | * Arguments: @struct timeval *dst@ = destination block |
127 | * @const struct timeval *a@ = source blocks |
128 | * @time_t sec@, @unsigned long usec@ = time to subtract |
129 | * |
130 | * Returns: --- |
131 | * |
132 | * Use: Subtracts a literal time in seconds and microseconds. |
133 | */ |
134 | |
135 | extern void tv_subl(struct timeval */*dst*/, |
136 | const struct timeval */*a*/, |
137 | time_t /*sec*/, unsigned long /*usec*/); |
138 | |
139 | #define TV_SUBL(dst, a, sec, usec) do { \ |
140 | (dst)->tv_sec = (a)->tv_sec - (sec); \ |
141 | if ((a)->tv_usec >= (usec)) \ |
142 | (dst)->tv_usec = (a)->tv_usec - (usec); \ |
143 | else { \ |
144 | (dst)->tv_usec = (a)->tv_usec + MILLION - (usec); \ |
145 | (dst)->tv_sec--; \ |
146 | } \ |
147 | } while (0) |
148 | |
247239be |
149 | /* --- @tv_cmp@ --- * |
150 | * |
151 | * Arguments: @const struct timeval *a, *b@ = source blocks |
152 | * |
153 | * Returns: Less than, equal to, or greater than zero. |
154 | * |
155 | * Use: Compares two timevals. |
156 | */ |
157 | |
158 | extern int tv_cmp(const struct timeval */*a*/, |
159 | const struct timeval */*b*/); |
160 | |
9239a724 |
161 | #define TV_CMP(a, op, b) ((a)->tv_sec == (b)->tv_sec ? \ |
162 | (a)->tv_usec op (b)->tv_usec : \ |
163 | (a)->tv_sec op (b)->tv_sec) |
164 | |
247239be |
165 | /*----- That's all, folks -------------------------------------------------*/ |
166 | |
167 | #ifdef __cplusplus |
168 | } |
169 | #endif |
170 | |
171 | #endif |