[PULL 04/32] io/channel: Have read/write functions take void * buffer argument

["Daniel P. Berrangé" <berrange@redhat.com>]

From: Philippe Mathieu-Daudé <philmd@linaro.org>

I/O channel read/write functions can operate on any area of
memory, regardless of the content their represent. Do not
restrict to array of char, use the void* type, which is also
the type of the underlying iovec::iov_base field.

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
[DB: also adapt test-crypto-tlssession.c func signatures]
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 include/crypto/tlssession.h         |  4 ++--
 include/io/channel.h                | 14 +++++++-------
 io/channel-tls.c                    |  4 ++--
 io/channel.c                        | 14 +++++++-------
 tests/unit/test-crypto-tlssession.c |  4 ++--
 5 files changed, 20 insertions(+), 20 deletions(-)

diff --git a/include/crypto/tlssession.h b/include/crypto/tlssession.h
index 2e9fe11cf6..28e419681e 100644
--- a/include/crypto/tlssession.h
+++ b/include/crypto/tlssession.h
@@ -199,11 +199,11 @@ int qcrypto_tls_session_check_credentials(QCryptoTLSSession *sess,
  * These must return QCRYPTO_TLS_SESSION_ERR_BLOCK if the I/O
  * would block, but on other errors, must fill 'errp'
  */
-typedef ssize_t (*QCryptoTLSSessionWriteFunc)(const char *buf,
+typedef ssize_t (*QCryptoTLSSessionWriteFunc)(const void *buf,
                                               size_t len,
                                               void *opaque,
                                               Error **errp);
-typedef ssize_t (*QCryptoTLSSessionReadFunc)(char *buf,
+typedef ssize_t (*QCryptoTLSSessionReadFunc)(void *buf,
                                              size_t len,
                                              void *opaque,
                                              Error **errp);
diff --git a/include/io/channel.h b/include/io/channel.h
index 0f25ae0069..db893a3628 100644
--- a/include/io/channel.h
+++ b/include/io/channel.h
@@ -437,7 +437,7 @@ ssize_t qio_channel_writev(QIOChannel *ioc,
  * a single memory region.
  */
 ssize_t qio_channel_read(QIOChannel *ioc,
-                         char *buf,
+                         void *buf,
                          size_t buflen,
                          Error **errp);
 
@@ -453,7 +453,7 @@ ssize_t qio_channel_read(QIOChannel *ioc,
  * single memory region.
  */
 ssize_t qio_channel_write(QIOChannel *ioc,
-                          const char *buf,
+                          const void *buf,
                           size_t buflen,
                           Error **errp);
 
@@ -475,7 +475,7 @@ ssize_t qio_channel_write(QIOChannel *ioc,
  *          without data, or -1 on error
  */
 int coroutine_mixed_fn qio_channel_read_all_eof(QIOChannel *ioc,
-                                                char *buf,
+                                                void *buf,
                                                 size_t buflen,
                                                 Error **errp);
 
@@ -495,7 +495,7 @@ int coroutine_mixed_fn qio_channel_read_all_eof(QIOChannel *ioc,
  * Returns: 0 if all bytes were read, or -1 on error
  */
 int coroutine_mixed_fn qio_channel_read_all(QIOChannel *ioc,
-                                            char *buf,
+                                            void *buf,
                                             size_t buflen,
                                             Error **errp);
 
@@ -514,7 +514,7 @@ int coroutine_mixed_fn qio_channel_read_all(QIOChannel *ioc,
  * Returns: 0 if all bytes were written, or -1 on error
  */
 int coroutine_mixed_fn qio_channel_write_all(QIOChannel *ioc,
-                                             const char *buf,
+                                             const void *buf,
                                              size_t buflen,
                                              Error **errp);
 
@@ -595,7 +595,7 @@ ssize_t qio_channel_pwritev(QIOChannel *ioc, const struct iovec *iov,
  * flag QIO_CHANNEL_FEATURE_SEEKABLE prior to calling this method.
  *
  */
-ssize_t qio_channel_pwrite(QIOChannel *ioc, char *buf, size_t buflen,
+ssize_t qio_channel_pwrite(QIOChannel *ioc, void *buf, size_t buflen,
                            off_t offset, Error **errp);
 
 /**
@@ -631,7 +631,7 @@ ssize_t qio_channel_preadv(QIOChannel *ioc, const struct iovec *iov,
  * flag QIO_CHANNEL_FEATURE_SEEKABLE prior to calling this method.
  *
  */
-ssize_t qio_channel_pread(QIOChannel *ioc, char *buf, size_t buflen,
+ssize_t qio_channel_pread(QIOChannel *ioc, void *buf, size_t buflen,
                           off_t offset, Error **errp);
 
 /**
diff --git a/io/channel-tls.c b/io/channel-tls.c
index ce041795c1..b0cec27cb9 100644
--- a/io/channel-tls.c
+++ b/io/channel-tls.c
@@ -26,7 +26,7 @@
 #include "qemu/atomic.h"
 
 
-static ssize_t qio_channel_tls_write_handler(const char *buf,
+static ssize_t qio_channel_tls_write_handler(const void *buf,
                                              size_t len,
                                              void *opaque,
                                              Error **errp)
@@ -43,7 +43,7 @@ static ssize_t qio_channel_tls_write_handler(const char *buf,
     return ret;
 }
 
-static ssize_t qio_channel_tls_read_handler(char *buf,
+static ssize_t qio_channel_tls_read_handler(void *buf,
                                             size_t len,
                                             void *opaque,
                                             Error **errp)
diff --git a/io/channel.c b/io/channel.c
index 852e684938..8e8bd2efa8 100644
--- a/io/channel.c
+++ b/io/channel.c
@@ -310,7 +310,7 @@ ssize_t qio_channel_writev(QIOChannel *ioc,
 
 
 ssize_t qio_channel_read(QIOChannel *ioc,
-                         char *buf,
+                         void *buf,
                          size_t buflen,
                          Error **errp)
 {
@@ -320,7 +320,7 @@ ssize_t qio_channel_read(QIOChannel *ioc,
 
 
 ssize_t qio_channel_write(QIOChannel *ioc,
-                          const char *buf,
+                          const void *buf,
                           size_t buflen,
                           Error **errp)
 {
@@ -330,7 +330,7 @@ ssize_t qio_channel_write(QIOChannel *ioc,
 
 
 int coroutine_mixed_fn qio_channel_read_all_eof(QIOChannel *ioc,
-                                                char *buf,
+                                                void *buf,
                                                 size_t buflen,
                                                 Error **errp)
 {
@@ -340,7 +340,7 @@ int coroutine_mixed_fn qio_channel_read_all_eof(QIOChannel *ioc,
 
 
 int coroutine_mixed_fn qio_channel_read_all(QIOChannel *ioc,
-                                            char *buf,
+                                            void *buf,
                                             size_t buflen,
                                             Error **errp)
 {
@@ -350,7 +350,7 @@ int coroutine_mixed_fn qio_channel_read_all(QIOChannel *ioc,
 
 
 int coroutine_mixed_fn qio_channel_write_all(QIOChannel *ioc,
-                                             const char *buf,
+                                             const void *buf,
                                              size_t buflen,
                                              Error **errp)
 {
@@ -475,7 +475,7 @@ ssize_t qio_channel_pwritev(QIOChannel *ioc, const struct iovec *iov,
     return klass->io_pwritev(ioc, iov, niov, offset, errp);
 }
 
-ssize_t qio_channel_pwrite(QIOChannel *ioc, char *buf, size_t buflen,
+ssize_t qio_channel_pwrite(QIOChannel *ioc, void *buf, size_t buflen,
                            off_t offset, Error **errp)
 {
     struct iovec iov = {
@@ -504,7 +504,7 @@ ssize_t qio_channel_preadv(QIOChannel *ioc, const struct iovec *iov,
     return klass->io_preadv(ioc, iov, niov, offset, errp);
 }
 
-ssize_t qio_channel_pread(QIOChannel *ioc, char *buf, size_t buflen,
+ssize_t qio_channel_pread(QIOChannel *ioc, void *buf, size_t buflen,
                           off_t offset, Error **errp)
 {
     struct iovec iov = {
diff --git a/tests/unit/test-crypto-tlssession.c b/tests/unit/test-crypto-tlssession.c
index d0baf3b304..0d06a6892e 100644
--- a/tests/unit/test-crypto-tlssession.c
+++ b/tests/unit/test-crypto-tlssession.c
@@ -36,7 +36,7 @@
 #define KEYFILE WORKDIR "key-ctx.pem"
 
 static ssize_t
-testWrite(const char *buf, size_t len, void *opaque, Error **errp)
+testWrite(const void *buf, size_t len, void *opaque, Error **errp)
 {
     int *fd = opaque;
     int ret;
@@ -54,7 +54,7 @@ testWrite(const char *buf, size_t len, void *opaque, Error **errp)
 }
 
 static ssize_t
-testRead(char *buf, size_t len, void *opaque, Error **errp)
+testRead(void *buf, size_t len, void *opaque, Error **errp)
 {
     int *fd = opaque;
     int ret;
-- 
2.51.1