clang-format our code with Google-style

Hi,

This is my current least-effort proposal: I've generated a clang format file with clang-format --style=Google -dump-config > .clang-format and checked it in. I then used it to format our source files. I'm not hung up on Google-style, I chose it because Petr once mentioned it I think and because we wanted to follow also the Google coding standards.

The drawback of this MR is that it ruins git-blame for all previous changes. A way around this is to rewrite our history such as described in https://stackoverflow.com/a/58042990, but I don't know if it's worth the effort.

Let me know what you think.

(Also: If we merge this we should the introduce either pre- or (if possible) post-commit hooks to ensure that we stick the the format.

src/DmaInputFilter.cc

+#include "DmaInputFilter.h"
+
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
 #include <cassert>
-#include <cstdio>
 #include <cerrno>
-#include <system_error>
+#include <cstdio>
 #include <iostream>
 #include <sstream>
+#include <system_error>
 
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-
-#include "DmaInputFilter.h"
 #include "log.h"
 
-
-
-DmaInputFilter::DmaInputFilter( const std::string& deviceFileName, size_t packetBufferSize, size_t nbPacketBuffers, ctrl& control ) : 
-  InputFilter( packetBufferSize, nbPacketBuffers, control )
-{ 
-  dma_fd = open( deviceFileName.c_str(), O_RDWR | O_NONBLOCK );
-  if ( dma_fd < 0 ) {
-    throw std::system_error(errno, std::system_category(), "Cannot open DMA device: " + deviceFileName);
+DmaInputFilter::DmaInputFilter(const std::string& deviceFileName,
+                               size_t packetBufferSize, size_t nbPacketBuffers,
+                               ctrl& control)
+    : InputFilter(packetBufferSize, nbPacketBuffers, control) {
+  dma_fd = open(deviceFileName.c_str(), O_RDWR | O_NONBLOCK);
+  if (dma_fd < 0) {
+    throw std::system_error(errno, std::system_category(),
+                            "Cannot open DMA device: " + deviceFileName);
   }
 
-  LOG(TRACE) << "Created DMA input filter"; 
+  LOG(TRACE) << "Created DMA input filter";
 }
 
 DmaInputFilter::~DmaInputFilter() {
-  close( dma_fd );
+  close(dma_fd);
   LOG(TRACE) << "Destroyed DMA input filter";
 }
 
@@ -38,10 +39,10 @@ DmaInputFilter::~DmaInputFilter() {
  *	systems.)
  */
 
-#define RW_MAX_SIZE	0x7ffff000
+#define RW_MAX_SIZE 0x7ffff000
 
-static inline ssize_t read_axi_packet_to_buffer(int fd, char *buffer, uint64_t size)
-{
+static inline ssize_t read_axi_packet_to_buffer(int fd, char* buffer,
+                                                uint64_t size) {
   ssize_t rc;
   uint64_t to_read = size;
 
@@ -54,12 +55,11 @@ static inline ssize_t read_axi_packet_to_buffer(int fd, char *buffer, uint64_t s
 
   if (rc <= 0) {
     return rc;
-  }	
+  }
   return rc;
 }
 
-ssize_t DmaInputFilter::readPacketFromDMA(char **buffer, size_t bufferSize)
-{
+ssize_t DmaInputFilter::readPacketFromDMA(char** buffer, size_t bufferSize) {
   // Read from DMA
 
   ssize_t bytesRead = 0;
@@ -75,18 +75,22 @@ ssize_t DmaInputFilter::readPacketFromDMA(char **buffer, size_t bufferSize)
       if (errno == EIO || errno == EMSGSIZE) {
         if (errno == EIO) {
           stats.nbDmaErrors++;
-          LOG(ERROR) << "#" << nbReads() << ": DMA I/O ERROR. Skipping packet #" << skip << '.';
+          LOG(ERROR) << "#" << nbReads() << ": DMA I/O ERROR. Skipping packet #"
+                     << skip << '.';
         } else {
           stats.nbDmaOversizedPackets++;
-          LOG(ERROR) << "#" << nbReads() << ": DMA read returned oversized packet. DMA returned " << bytesRead << ", buffer size is " << bufferSize << ". Skipping packet #" << skip << '.';
+          LOG(ERROR) << "#" << nbReads()
+                     << ": DMA read returned oversized packet. DMA returned "
+                     << bytesRead << ", buffer size is " << bufferSize
+                     << ". Skipping packet #" << skip << '.';
         }
         continue;
       }
 
       // Some fatal error occurred
       std::ostringstream os;
-      os  << "Iteration: " << nbReads() << "  ERROR: DMA read failed.";
-      throw std::system_error(errno, std::system_category(), os.str() );
+      os << "Iteration: " << nbReads() << "  ERROR: DMA read failed.";
+      throw std::system_error(errno, std::system_category(), os.str());
     }
 
     // We have some data
@@ -96,24 +100,18 @@ ssize_t DmaInputFilter::readPacketFromDMA(char **buffer, size_t bufferSize)
   return bytesRead;
 }
 
-
 /**************************************************************************
  * Entry points are here
  * Overriding virtual functions
  */
 
-
 // Print some additional info
-void DmaInputFilter::print(std::ostream& out) const
-{
-    out 
-      << ", DMA errors " << stats.nbDmaErrors
-      << ", oversized " << stats.nbDmaOversizedPackets;
+void DmaInputFilter::print(std::ostream& out) const {
+  out << ", DMA errors " << stats.nbDmaErrors << ", oversized "
+      << stats.nbDmaOversizedPackets;
 }
 
-
 // Read a packet from DMA
-ssize_t DmaInputFilter::readInput(char **buffer, size_t bufferSize)
-{
-  return readPacketFromDMA( buffer, bufferSize );
+ssize_t DmaInputFilter::readInput(char** buffer, size_t bufferSize) {
+  return readPacketFromDMA(buffer, bufferSize);
 }