886884ab60
The resolution of the GetTickCount function is limited to the resolution of the system timer, which is typically in the range of 10 to 16 milliseconds. This is unsufficient for measuring very short time intervals in the milliseconds range. The QueryPerformanceCounter function provides much higher resolution timestamps. We already use it for the half-duplex workaround.
109 lines
2.7 KiB
C
109 lines
2.7 KiB
C
/*
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* libdivecomputer
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*
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* Copyright (C) 2008 Jef Driesen
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <stdarg.h>
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#include <string.h>
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#include <libdivecomputer/datetime.h>
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#include <libdivecomputer/version.h>
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#include "utils.h"
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static FILE* g_logfile = NULL;
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static unsigned char g_lastchar = '\n';
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#ifdef _WIN32
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#include <windows.h>
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static LARGE_INTEGER g_timestamp, g_frequency;
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#else
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#include <sys/time.h>
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static struct timeval g_timestamp;
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#endif
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int message (const char* fmt, ...)
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{
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va_list ap;
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if (g_logfile) {
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if (g_lastchar == '\n') {
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#ifdef _WIN32
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LARGE_INTEGER now, timestamp;
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QueryPerformanceCounter(&now);
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timestamp.QuadPart = now.QuadPart - g_timestamp.QuadPart;
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timestamp.QuadPart *= 1000000;
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timestamp.QuadPart /= g_frequency.QuadPart;
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fprintf (g_logfile, "[%I64i.%06I64i] ", timestamp.QuadPart / 1000000, timestamp.QuadPart % 1000000);
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#else
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struct timeval now, timestamp;
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gettimeofday (&now, NULL);
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timersub (&now, &g_timestamp, ×tamp);
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fprintf (g_logfile, "[%lli.%06lli] ", (long long)timestamp.tv_sec, (long long)timestamp.tv_usec);
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#endif
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}
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size_t len = strlen (fmt);
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if (len > 0)
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g_lastchar = fmt[len - 1];
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else
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g_lastchar = 0;
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va_start (ap, fmt);
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vfprintf (g_logfile, fmt, ap);
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va_end (ap);
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}
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va_start (ap, fmt);
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int rc = vfprintf (stderr, fmt, ap);
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va_end (ap);
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return rc;
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}
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void message_set_logfile (const char* filename)
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{
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if (g_logfile) {
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fclose (g_logfile);
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g_logfile = NULL;
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}
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if (filename)
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g_logfile = fopen (filename, "w");
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if (g_logfile) {
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g_lastchar = '\n';
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#ifdef _WIN32
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QueryPerformanceFrequency(&g_frequency);
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QueryPerformanceCounter(&g_timestamp);
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#else
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gettimeofday (&g_timestamp, NULL);
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#endif
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dc_datetime_t dt = {0};
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dc_ticks_t now = dc_datetime_now ();
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dc_datetime_gmtime (&dt, now);
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message ("DATETIME %u-%02u-%02uT%02u:%02u:%02uZ (%lu)\n",
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dt.year, dt.month, dt.day, dt.hour, dt.minute, dt.second,
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(unsigned long) now);
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message ("VERSION %s\n", dc_version (NULL));
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}
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}
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