Move `crypto/bio/internal.h` into the `bssl` namespace.

The CL, except for the `crypto/bio/internal.h` change and moving the
`using` declaration to the right place in `crypto/bio/socket.cc` as the
tool got confused by `OPENSSL_MSVC_PRAGMA` use, was generated entirely
automatically using `util/move_symbol_into_namespace.pl`.

Bug: 42220000
Change-Id: I2241c87d45c726259d1472d2e2061c1bee7ac59b
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/85708
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: Rudolf Polzer <rpolzer@google.com>

crypto/bio/connect.cc

diff --git a/crypto/bio/connect.cc b/crypto/bio/connect.cc
index 2ef74be..511a46f 100644
--- a/crypto/bio/connect.cc
+++ b/crypto/bio/connect.cc
@@ -37,6 +37,8 @@
 #include "internal.h"
 
 
+using namespace bssl;
+
 enum {
   BIO_CONN_S_BEFORE,
   BIO_CONN_S_BLOCKED_CONNECT,

crypto/bio/errno.cc

diff --git a/crypto/bio/errno.cc b/crypto/bio/errno.cc
index 6c0df07..6e31fac 100644
--- a/crypto/bio/errno.cc
+++ b/crypto/bio/errno.cc
@@ -19,7 +19,9 @@
 #include "internal.h"
 
 
-int bio_errno_should_retry(int return_value) {
+using namespace bssl;
+
+int bssl::bio_errno_should_retry(int return_value) {
   if (return_value != -1) {
     return 0;
   }

crypto/bio/fd.cc

diff --git a/crypto/bio/fd.cc b/crypto/bio/fd.cc
index bbbd8a1..4d707b5 100644
--- a/crypto/bio/fd.cc
+++ b/crypto/bio/fd.cc
@@ -44,6 +44,8 @@
   #define BORINGSSL_WRITE write
 #endif
 
+using namespace bssl;
+
 BIO *BIO_new_fd(int fd, int close_flag) {
   BIO *ret = BIO_new(BIO_s_fd());
   if (ret == nullptr) {

crypto/bio/internal.h

diff --git a/crypto/bio/internal.h b/crypto/bio/internal.h
index 3a0b961..29d2919 100644
--- a/crypto/bio/internal.h
+++ b/crypto/bio/internal.h
@@ -35,10 +35,6 @@
 #endif
 #endif  // !OPENSSL_NO_SOCK
 
-#if defined(__cplusplus)
-extern "C" {
-#endif
-
 
 struct bio_method_st {
   int type;
@@ -79,6 +75,8 @@
   uint64_t num_read, num_write;
 };
 
+BSSL_NAMESPACE_BEGIN
+
 #if !defined(OPENSSL_NO_SOCK)
 
 // bio_ip_and_port_to_socket_and_addr creates a socket and fills in |*out_addr|
@@ -112,9 +110,7 @@
 // and |errno| indicates that it's non-fatal.
 int bio_errno_should_retry(int return_value);
 
+BSSL_NAMESPACE_END
 
-#if defined(__cplusplus)
-}  // extern C
-#endif
 
 #endif  // OPENSSL_HEADER_CRYPTO_BIO_INTERNAL_H

crypto/bio/socket.cc

diff --git a/crypto/bio/socket.cc b/crypto/bio/socket.cc
index acf595a..7efc674 100644
--- a/crypto/bio/socket.cc
+++ b/crypto/bio/socket.cc
@@ -29,10 +29,10 @@
 #include "internal.h"
 
 
+using namespace bssl;
+
 #if !defined(OPENSSL_WINDOWS)
-static int closesocket(int sock) {
-  return close(sock);
-}
+static int closesocket(int sock) { return close(sock); }
 #endif
 
 static int sock_free(BIO *bio) {

crypto/bio/socket_helper.cc

diff --git a/crypto/bio/socket_helper.cc b/crypto/bio/socket_helper.cc
index 7d1e2a3..187d956 100644
--- a/crypto/bio/socket_helper.cc
+++ b/crypto/bio/socket_helper.cc
@@ -38,11 +38,13 @@
 #include "../internal.h"
 
 
-int bio_ip_and_port_to_socket_and_addr(int *out_sock,
-                                       struct sockaddr_storage *out_addr,
-                                       socklen_t *out_addr_length,
-                                       const char *hostname,
-                                       const char *port_str) {
+using namespace bssl;
+
+int bssl::bio_ip_and_port_to_socket_and_addr(int *out_sock,
+                                             struct sockaddr_storage *out_addr,
+                                             socklen_t *out_addr_length,
+                                             const char *hostname,
+                                             const char *port_str) {
   struct addrinfo hint, *result, *cur;
   int ret;
 
@@ -88,7 +90,7 @@
   return ret;
 }
 
-int bio_socket_nbio(int sock, int on) {
+int bssl::bio_socket_nbio(int sock, int on) {
 #if defined(OPENSSL_WINDOWS)
   u_long arg = on;
 
@@ -107,9 +109,9 @@
 #endif
 }
 
-void bio_clear_socket_error(void) {}
+void bssl::bio_clear_socket_error(void) {}
 
-int bio_sock_error(int sock) {
+int bssl::bio_sock_error(int sock) {
   int error;
   socklen_t error_size = sizeof(error);
 
@@ -119,7 +121,7 @@
   return error;
 }
 
-int bio_socket_should_retry(int return_value) {
+int bssl::bio_socket_should_retry(int return_value) {
 #if defined(OPENSSL_WINDOWS)
   return return_value == -1 && WSAGetLastError() == WSAEWOULDBLOCK;
 #else