src/add-ons/kernel/bus_managers/ata/ATATracing.cpp

   1 /*
   2  * Copyright 2009, Michael Lotz, mmlr@mlotz.ch.
   3  * Distributed under the terms of the MIT License.
   4  */
   5
   6 #include "ATATracing.h"
   7
   8 #include <stdarg.h>
   9
  10 #include <algorithm>
  11
  12
  13 static char sTraceBuffer[256];
  14 static uint32 sTraceBufferOffset = 0;
  15
  16
  17 void
  18 ata_trace_printf(uint32 flags, const char *format, ...)
  19 {
  20         if (sTraceBufferOffset < sizeof(sTraceBuffer)) {
  21                 va_list arguments;
  22                 va_start(arguments, format);
  23                 size_t totalBytes = vsnprintf(sTraceBuffer + sTraceBufferOffset,
  24                         sizeof(sTraceBuffer) - sTraceBufferOffset, format, arguments);
  25                 sTraceBufferOffset += std::min(totalBytes,
  26                         sizeof(sTraceBuffer) - sTraceBufferOffset - 1);
  27                 va_end(arguments);
  28         }
  29
  30         if (flags & ATA_TRACE_FLUSH) {
  31 #if ATA_TRACING
  32                 ktrace_printf(sTraceBuffer);
  33 #endif
  34                 if (flags & ATA_TRACE_SYSLOG)
  35                         dprintf(sTraceBuffer);
  36
  37                 sTraceBufferOffset = 0;
  38         }
  39 }