diff options
Diffstat (limited to 'lib/timeval.c')
| -rw-r--r-- | lib/timeval.c | 26 |
1 files changed, 18 insertions, 8 deletions
diff --git a/lib/timeval.c b/lib/timeval.c index bed44c573..1012b4e39 100644 --- a/lib/timeval.c +++ b/lib/timeval.c @@ -5,7 +5,7 @@ * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * - * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al. + * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al. * * This software is licensed as described in the file COPYING, which * you should have received as part of this distribution. The terms @@ -130,14 +130,24 @@ time_t curlx_tvdiff(struct timeval newer, struct timeval older) } /* - * Same as curlx_tvdiff but with full usec resolution. + * Make sure that the first argument is the more recent time, as otherwise + * we'll get a weird negative time-diff back... * - * Returns: the time difference in seconds with subsecond resolution. + * Returns: the time difference in number of microseconds. For too large diffs + * it returns max value. */ -double curlx_tvdiff_secs(struct timeval newer, struct timeval older) +time_t Curl_tvdiff_us(struct timeval newer, struct timeval older) { - if(newer.tv_sec != older.tv_sec) - return (double)(newer.tv_sec-older.tv_sec)+ - (double)(newer.tv_usec-older.tv_usec)/1000000.0; - return (double)(newer.tv_usec-older.tv_usec)/1000000.0; + time_t diff = newer.tv_sec-older.tv_sec; +#if SIZEOF_TIME_T < 8 + /* for 32bit time_t systems */ + if(diff >= (0x7fffffff/1000000)) + return 0x7fffffff; +#else + /* for 64bit time_t systems */ + if(diff >= (0x7fffffffffffffff/1000000)) + return 0x7fffffffffffffff; +#endif + return (newer.tv_sec-older.tv_sec)*1000000+ + (time_t)(newer.tv_usec-older.tv_usec); } |