| 1 | /***************************************************************************
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| 2 | * _ _ ____ _
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| 3 | * Project ___| | | | _ \| |
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| 4 | * / __| | | | |_) | |
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| 5 | * | (__| |_| | _ <| |___
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| 6 | * \___|\___/|_| \_\_____|
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| 7 | *
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| 8 | * Copyright (C) 1998 - 2022, Daniel Stenberg, <[email protected]>, et al.
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| 9 | *
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| 10 | * This software is licensed as described in the file COPYING, which
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| 11 | * you should have received as part of this distribution. The terms
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| 12 | * are also available at https://curl.se/docs/copyright.html.
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| 13 | *
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| 14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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| 15 | * copies of the Software, and permit persons to whom the Software is
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| 16 | * furnished to do so, under the terms of the COPYING file.
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| 17 | *
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| 18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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| 19 | * KIND, either express or implied.
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| 20 | *
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| 21 | ***************************************************************************/
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| 22 |
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| 23 | #include "timediff.h"
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| 24 |
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| 25 | /*
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| 26 | * Converts number of milliseconds into a timeval structure.
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| 27 | *
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| 28 | * Return values:
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| 29 | * NULL IF tv is NULL or ms < 0 (eg. no timeout -> blocking select)
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| 30 | * tv with 0 in both fields IF ms == 0 (eg. 0ms timeout -> polling select)
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| 31 | * tv with converted fields IF ms > 0 (eg. >0ms timeout -> waiting select)
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| 32 | */
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| 33 | struct timeval *curlx_mstotv(struct timeval *tv, timediff_t ms)
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| 34 | {
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| 35 | if(!tv)
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| 36 | return NULL;
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| 37 |
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| 38 | if(ms < 0)
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| 39 | return NULL;
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| 40 |
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| 41 | if(ms > 0) {
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| 42 | timediff_t tv_sec = ms / 1000;
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| 43 | timediff_t tv_usec = (ms % 1000) * 1000; /* max=999999 */
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| 44 | #ifdef HAVE_SUSECONDS_T
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| 45 | #if TIMEDIFF_T_MAX > TIME_T_MAX
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| 46 | /* tv_sec overflow check in case time_t is signed */
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| 47 | if(tv_sec > TIME_T_MAX)
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| 48 | tv_sec = TIME_T_MAX;
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| 49 | #endif
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| 50 | tv->tv_sec = (time_t)tv_sec;
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| 51 | tv->tv_usec = (suseconds_t)tv_usec;
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| 52 | #elif defined(WIN32) /* maybe also others in the future */
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| 53 | #if TIMEDIFF_T_MAX > LONG_MAX
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| 54 | /* tv_sec overflow check on Windows there we know it is long */
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| 55 | if(tv_sec > LONG_MAX)
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| 56 | tv_sec = LONG_MAX;
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| 57 | #endif
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| 58 | tv->tv_sec = (long)tv_sec;
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| 59 | tv->tv_usec = (long)tv_usec;
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| 60 | #else
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| 61 | #if TIMEDIFF_T_MAX > INT_MAX
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| 62 | /* tv_sec overflow check in case time_t is signed */
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| 63 | if(tv_sec > INT_MAX)
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| 64 | tv_sec = INT_MAX;
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| 65 | #endif
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| 66 | tv->tv_sec = (int)tv_sec;
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| 67 | tv->tv_usec = (int)tv_usec;
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| 68 | #endif
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| 69 | }
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| 70 | else {
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| 71 | tv->tv_sec = 0;
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| 72 | tv->tv_usec = 0;
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| 73 | }
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| 74 |
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| 75 | return tv;
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| 76 | }
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| 77 |
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| 78 | /*
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| 79 | * Converts a timeval structure into number of milliseconds.
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| 80 | */
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| 81 | timediff_t curlx_tvtoms(struct timeval *tv)
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| 82 | {
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| 83 | return (tv->tv_sec*1000) + (timediff_t)(((double)tv->tv_usec)/1000.0);
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| 84 | }
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