1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at https://curl.se/docs/copyright.html.
13 *
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 * SPDX-License-Identifier: curl
22 *
23 ***************************************************************************/
24
25 #include "timediff.h"
26
27 #include <limits.h>
28
29 /*
30 * Converts number of milliseconds into a timeval structure.
31 *
32 * Return values:
33 * NULL IF tv is NULL or ms < 0 (eg. no timeout -> blocking select)
34 * tv with 0 in both fields IF ms == 0 (eg. 0ms timeout -> polling select)
35 * tv with converted fields IF ms > 0 (eg. >0ms timeout -> waiting select)
36 */
curlx_mstotv(struct timeval * tv,timediff_t ms)37 struct timeval *curlx_mstotv(struct timeval *tv, timediff_t ms)
38 {
39 if(!tv)
40 return NULL;
41
42 if(ms < 0)
43 return NULL;
44
45 if(ms > 0) {
46 timediff_t tv_sec = ms / 1000;
47 timediff_t tv_usec = (ms % 1000) * 1000; /* max=999999 */
48 #ifdef HAVE_SUSECONDS_T
49 #if TIMEDIFF_T_MAX > TIME_T_MAX
50 /* tv_sec overflow check in case time_t is signed */
51 if(tv_sec > TIME_T_MAX)
52 tv_sec = TIME_T_MAX;
53 #endif
54 tv->tv_sec = (time_t)tv_sec;
55 tv->tv_usec = (suseconds_t)tv_usec;
56 #elif defined(_WIN32) /* maybe also others in the future */
57 #if TIMEDIFF_T_MAX > LONG_MAX
58 /* tv_sec overflow check on Windows there we know it is long */
59 if(tv_sec > LONG_MAX)
60 tv_sec = LONG_MAX;
61 #endif
62 tv->tv_sec = (long)tv_sec;
63 tv->tv_usec = (long)tv_usec;
64 #else
65 #if TIMEDIFF_T_MAX > INT_MAX
66 /* tv_sec overflow check in case time_t is signed */
67 if(tv_sec > INT_MAX)
68 tv_sec = INT_MAX;
69 #endif
70 tv->tv_sec = (int)tv_sec;
71 tv->tv_usec = (int)tv_usec;
72 #endif
73 }
74 else {
75 tv->tv_sec = 0;
76 tv->tv_usec = 0;
77 }
78
79 return tv;
80 }
81
82 /*
83 * Converts a timeval structure into number of milliseconds.
84 */
curlx_tvtoms(struct timeval * tv)85 timediff_t curlx_tvtoms(struct timeval *tv)
86 {
87 return (tv->tv_sec*1000) + (timediff_t)(((double)tv->tv_usec)/1000.0);
88 }
89