Core: Modernize C headers with C++ equivalents

drivers/unix/dir_access_unix.cpp

@@ -37,14 +37,13 @@
 #include "core/string/print_string.h"
 #include "core/templates/list.h"
 
-#include <errno.h>
 #include <fcntl.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
 #include <sys/ioctl.h>
 #include <sys/stat.h>
 #include <sys/statvfs.h>
+#include <cerrno>
+#include <cstdio>
+#include <cstdlib>
 
 #if __has_include(<mntent.h>)
 #include <mntent.h>

drivers/unix/file_access_unix.cpp

@@ -35,15 +35,15 @@
 #include "core/os/os.h"
 #include "core/string/print_string.h"
 
-#include <errno.h>
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
+#include <cerrno>
 
 #if defined(TOOLS_ENABLED)
-#include <limits.h>
-#include <stdlib.h>
+#include <climits>
+#include <cstdlib>
 #endif
 
 void FileAccessUnix::check_errors(bool p_write) const {

drivers/unix/file_access_unix.h

@@ -33,7 +33,7 @@
 #include "core/io/file_access.h"
 #include "core/os/memory.h"
 
-#include <stdio.h>
+#include <cstdio>
 
 #if defined(UNIX_ENABLED)
 

drivers/unix/file_access_unix_pipe.cpp

@@ -35,12 +35,12 @@
 #include "core/os/os.h"
 #include "core/string/print_string.h"
 
-#include <errno.h>
 #include <fcntl.h>
 #include <sys/ioctl.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
+#include <cerrno>
 
 Error FileAccessUnixPipe::open_existing(int p_rfd, int p_wfd, bool p_blocking) {
 	// Open pipe using handles created by pipe(fd) call in the OS.execute_with_pipe.

drivers/unix/file_access_unix_pipe.h

@@ -33,7 +33,7 @@
 #include "core/io/file_access.h"
 #include "core/os/memory.h"
 
-#include <stdio.h>
+#include <cstdio>
 
 #if defined(UNIX_ENABLED)
 

drivers/unix/ip_unix.cpp

@@ -54,8 +54,6 @@
 
 #include <net/if.h> // Order is important on OpenBSD, leave as last.
 
-#include <string.h>
-
 static IPAddress _sockaddr2ip(struct sockaddr *p_addr) {
 	IPAddress ip;
 

drivers/unix/net_socket_unix.cpp

@@ -34,19 +34,18 @@
 
 #include "net_socket_unix.h"
 
-#include <errno.h>
 #include <fcntl.h>
 #include <netdb.h>
 #include <netinet/in.h>
 #include <netinet/tcp.h>
 #include <poll.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
 #include <sys/ioctl.h>
 #include <sys/socket.h>
 #include <sys/types.h>
 #include <unistd.h>
+#include <cerrno>
+#include <cstdio>
+#include <cstdlib>
 
 #ifdef WEB_ENABLED
 #include <arpa/inet.h>

drivers/unix/os_unix.cpp

@@ -69,19 +69,18 @@
 #endif
 
 #include <dlfcn.h>
-#include <errno.h>
 #include <poll.h>
-#include <signal.h>
-#include <stdarg.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
 #include <sys/resource.h>
 #include <sys/stat.h>
 #include <sys/time.h>
 #include <sys/wait.h>
-#include <time.h>
 #include <unistd.h>
+#include <cerrno>
+#include <csignal>
+#include <cstdarg>
+#include <cstdio>
+#include <cstdlib>
+#include <ctime>
 
 #ifndef RTLD_DEEPBIND
 #define RTLD_DEEPBIND 0