3 * $Id: tv.c,v 1.5 1999/05/21 22:13:12 mdw Exp $
5 * Manipulation of timeval structures
7 * (c) 1998 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of the mLib utilities library.
14 * mLib is free software; you can redistribute it and/or modify
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.
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
22 * GNU Library General Public License for more details.
24 * You should have received a copy of the GNU Library General Public
25 * License along with mLib; if not, write to the Free
26 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
30 /*----- Revision history --------------------------------------------------*
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.
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.
41 * Revision 1.3 1999/05/06 19:51:36 mdw
42 * Reformatted the LGPL notice a little bit.
44 * Revision 1.2 1999/05/05 18:50:31 mdw
45 * Change licensing conditions to LGPL.
47 * Revision 1.1 1998/11/25 23:30:01 mdw
52 /*----- Header files ------------------------------------------------------*/
57 /*----- Main code ---------------------------------------------------------*/
61 * Arguments: @struct timeval *dst@ = destination block
62 * @const struct timeval *a, *b@ = source blocks
66 * Use: Adds two timevals.
69 void tv_add(struct timeval
*dst
,
70 const struct timeval
*a
, const struct timeval
*b
)
75 /* --- @tv_addl@ --- *
77 * Arguments: @struct timeval *dst@ = destination block
78 * @const struct timeval *a@ = source blocks
79 * @time_t sec@, @unsigned long usec@ = time to add
83 * Use: Adds a literal time in seconds and microseconds.
86 void tv_addl(struct timeval
*dst
, const struct timeval
*a
,
87 time_t sec
, unsigned long usec
)
89 TV_ADDL(dst
, a
, sec
, usec
);
94 * Arguments: @struct timeval *dst@ = destination block
95 * @const struct timeval *a, *b@ = source blocks
99 * Use: Subtracts two timevals.
102 void tv_sub(struct timeval
*dst
,
103 const struct timeval
*a
, const struct timeval
*b
)
108 /* --- @tv_subl@ --- *
110 * Arguments: @struct timeval *dst@ = destination block
111 * @const struct timeval *a@ = source blocks
112 * @time_t sec@, @unsigned long usec@ = time to subtract
116 * Use: Subtracts a literal time in seconds and microseconds.
119 void tv_subl(struct timeval
*dst
, const struct timeval
*a
,
120 time_t sec
, unsigned long usec
)
122 TV_SUBL(dst
, a
, sec
, usec
);
125 /* --- @tv_cmp@ --- *
127 * Arguments: @const struct timeval *a, *b@ = source blocks
129 * Returns: Less than, equal to, or greater than zero.
131 * Use: Compares two timevals.
134 int tv_cmp(const struct timeval
*a
, const struct timeval
*b
)
136 /* --- This is more awkward than the case the macro deals with --- */
138 if (a
->tv_sec
> b
->tv_sec
)
140 else if (a
->tv_sec
< b
->tv_sec
)
142 else if (a
->tv_usec
> b
->tv_usec
)
144 else if (a
->tv_usec
< b
->tv_usec
)
150 /*----- That's all, folks -------------------------------------------------*/