timediff.c (2639B)
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 */ 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=999000 */ 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 */ 85 timediff_t curlx_tvtoms(struct timeval *tv) 86 { 87 return (tv->tv_sec*1000) + (timediff_t)(tv->tv_usec/1000); 88 }