[Qemu-devel] [PATCH 02/12] qga: Use g_new() & friends where that makes obvious sense

[Michael Roth]

From: Markus Armbruster <address@hidden>

g_new(T, n) is neater than g_malloc(sizeof(T) * n).  It's also safer,
for two reasons.  One, it catches multiplication overflowing size_t.
Two, it returns T * rather than void *, which lets the compiler catch
more type errors.

This commit only touches allocations with size arguments of the form
sizeof(T).  Same Coccinelle semantic patch as in commit b45c03f.

Signed-off-by: Markus Armbruster <address@hidden>
Reviewed-by: Eric Blake <address@hidden>
Signed-off-by: Michael Roth <address@hidden>
---
 qga/channel-posix.c             |  2 +-
 qga/channel-win32.c             |  2 +-
 qga/commands-posix.c            | 10 +++++-----
 qga/commands-win32.c            | 10 +++++-----
 qga/commands.c                  |  6 +++---
 qga/guest-agent-command-state.c |  4 ++--
 6 files changed, 17 insertions(+), 17 deletions(-)

diff --git a/qga/channel-posix.c b/qga/channel-posix.c
index 8aad4fe..61aa3cb 100644
--- a/qga/channel-posix.c
+++ b/qga/channel-posix.c
@@ -249,7 +249,7 @@ GIOStatus ga_channel_read(GAChannel *c, gchar *buf, gsize 
size, gsize *count)
 GAChannel *ga_channel_new(GAChannelMethod method, const gchar *path,
                           GAChannelCallback cb, gpointer opaque)
 {
-    GAChannel *c = g_malloc0(sizeof(GAChannel));
+    GAChannel *c = g_new0(GAChannel, 1);
     c->event_cb = cb;
     c->user_data = opaque;
 
diff --git a/qga/channel-win32.c b/qga/channel-win32.c
index 04fa5e4..215b15a 100644
--- a/qga/channel-win32.c
+++ b/qga/channel-win32.c
@@ -322,7 +322,7 @@ static gboolean ga_channel_open(GAChannel *c, 
GAChannelMethod method,
 GAChannel *ga_channel_new(GAChannelMethod method, const gchar *path,
                           GAChannelCallback cb, gpointer opaque)
 {
-    GAChannel *c = g_malloc0(sizeof(GAChannel));
+    GAChannel *c = g_new0(GAChannel, 1);
     SECURITY_ATTRIBUTES sec_attrs;
 
     if (!ga_channel_open(c, method, path)) {
diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index b03c316..a932809 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -235,7 +235,7 @@ static int64_t guest_file_handle_add(FILE *fh, Error **errp)
         return -1;
     }
 
-    gfh = g_malloc0(sizeof(GuestFileHandle));
+    gfh = g_new0(GuestFileHandle, 1);
     gfh->id = handle;
     gfh->fh = fh;
     QTAILQ_INSERT_TAIL(&guest_file_state.filehandles, gfh, next);
@@ -488,7 +488,7 @@ struct GuestFileRead *qmp_guest_file_read(int64_t handle, 
bool has_count,
         slog("guest-file-read failed, handle: %" PRId64, handle);
     } else {
         buf[read_count] = 0;
-        read_data = g_malloc0(sizeof(GuestFileRead));
+        read_data = g_new0(GuestFileRead, 1);
         read_data->count = read_count;
         read_data->eof = feof(fh);
         if (read_count) {
@@ -533,7 +533,7 @@ GuestFileWrite *qmp_guest_file_write(int64_t handle, const 
char *buf_b64,
         error_setg_errno(errp, errno, "failed to write to file");
         slog("guest-file-write failed, handle: %" PRId64, handle);
     } else {
-        write_data = g_malloc0(sizeof(GuestFileWrite));
+        write_data = g_new0(GuestFileWrite, 1);
         write_data->count = write_count;
         write_data->eof = feof(fh);
     }
@@ -678,7 +678,7 @@ static void build_fs_mount_list_from_mtab(FsMountList 
*mounts, Error **errp)
             continue;
         }
 
-        mount = g_malloc0(sizeof(FsMount));
+        mount = g_new0(FsMount, 1);
         mount->dirname = g_strdup(ment->mnt_dir);
         mount->devtype = g_strdup(ment->mnt_type);
         mount->devmajor = devmajor;
@@ -757,7 +757,7 @@ static void build_fs_mount_list(FsMountList *mounts, Error 
**errp)
             }
         }
 
-        mount = g_malloc0(sizeof(FsMount));
+        mount = g_new0(FsMount, 1);
         mount->dirname = g_strdup(line + dir_s);
         mount->devtype = g_strdup(dash + type_s);
         mount->devmajor = devmajor;
diff --git a/qga/commands-win32.c b/qga/commands-win32.c
index 41bdd3f..0481646 100644
--- a/qga/commands-win32.c
+++ b/qga/commands-win32.c
@@ -106,7 +106,7 @@ static int64_t guest_file_handle_add(HANDLE fh, Error 
**errp)
     if (handle < 0) {
         return -1;
     }
-    gfh = g_malloc0(sizeof(GuestFileHandle));
+    gfh = g_new0(GuestFileHandle, 1);
     gfh->id = handle;
     gfh->fh = fh;
     QTAILQ_INSERT_TAIL(&guest_file_state.filehandles, gfh, next);
@@ -298,7 +298,7 @@ GuestFileRead *qmp_guest_file_read(int64_t handle, bool 
has_count,
         slog("guest-file-read failed, handle %" PRId64, handle);
     } else {
         buf[read_count] = 0;
-        read_data = g_malloc0(sizeof(GuestFileRead));
+        read_data = g_new0(GuestFileRead, 1);
         read_data->count = (size_t)read_count;
         read_data->eof = read_count == 0;
 
@@ -342,7 +342,7 @@ GuestFileWrite *qmp_guest_file_write(int64_t handle, const 
char *buf_b64,
         error_setg_win32(errp, GetLastError(), "failed to write to file");
         slog("guest-file-write-failed, handle: %" PRId64, handle);
     } else {
-        write_data = g_malloc0(sizeof(GuestFileWrite));
+        write_data = g_new0(GuestFileWrite, 1);
         write_data->count = (size_t) write_count;
     }
 
@@ -865,7 +865,7 @@ static DWORD WINAPI do_suspend(LPVOID opaque)
 void qmp_guest_suspend_disk(Error **errp)
 {
     Error *local_err = NULL;
-    GuestSuspendMode *mode = g_malloc(sizeof(GuestSuspendMode));
+    GuestSuspendMode *mode = g_new(GuestSuspendMode, 1);
 
     *mode = GUEST_SUSPEND_MODE_DISK;
     check_suspend_mode(*mode, &local_err);
@@ -881,7 +881,7 @@ void qmp_guest_suspend_disk(Error **errp)
 void qmp_guest_suspend_ram(Error **errp)
 {
     Error *local_err = NULL;
-    GuestSuspendMode *mode = g_malloc(sizeof(GuestSuspendMode));
+    GuestSuspendMode *mode = g_new(GuestSuspendMode, 1);
 
     *mode = GUEST_SUSPEND_MODE_RAM;
     check_suspend_mode(*mode, &local_err);
diff --git a/qga/commands.c b/qga/commands.c
index 7834967..9a765e8 100644
--- a/qga/commands.c
+++ b/qga/commands.c
@@ -51,12 +51,12 @@ static void qmp_command_info(QmpCommand *cmd, void *opaque)
     GuestAgentCommandInfo *cmd_info;
     GuestAgentCommandInfoList *cmd_info_list;
 
-    cmd_info = g_malloc0(sizeof(GuestAgentCommandInfo));
+    cmd_info = g_new0(GuestAgentCommandInfo, 1);
     cmd_info->name = g_strdup(qmp_command_name(cmd));
     cmd_info->enabled = qmp_command_is_enabled(cmd);
     cmd_info->success_response = qmp_has_success_response(cmd);
 
-    cmd_info_list = g_malloc0(sizeof(GuestAgentCommandInfoList));
+    cmd_info_list = g_new0(GuestAgentCommandInfoList, 1);
     cmd_info_list->value = cmd_info;
     cmd_info_list->next = info->supported_commands;
     info->supported_commands = cmd_info_list;
@@ -64,7 +64,7 @@ static void qmp_command_info(QmpCommand *cmd, void *opaque)
 
 struct GuestAgentInfo *qmp_guest_info(Error **errp)
 {
-    GuestAgentInfo *info = g_malloc0(sizeof(GuestAgentInfo));
+    GuestAgentInfo *info = g_new0(GuestAgentInfo, 1);
 
     info->version = g_strdup(QEMU_VERSION);
     qmp_for_each_command(qmp_command_info, info);
diff --git a/qga/guest-agent-command-state.c b/qga/guest-agent-command-state.c
index 969da23..128c549 100644
--- a/qga/guest-agent-command-state.c
+++ b/qga/guest-agent-command-state.c
@@ -27,7 +27,7 @@ void ga_command_state_add(GACommandState *cs,
                           void (*init)(void),
                           void (*cleanup)(void))
 {
-    GACommandGroup *cg = g_malloc0(sizeof(GACommandGroup));
+    GACommandGroup *cg = g_new0(GACommandGroup, 1);
     cg->init = init;
     cg->cleanup = cleanup;
     cs->groups = g_slist_append(cs->groups, cg);
@@ -67,7 +67,7 @@ void ga_command_state_cleanup_all(GACommandState *cs)
 
 GACommandState *ga_command_state_new(void)
 {
-    GACommandState *cs = g_malloc0(sizeof(GACommandState));
+    GACommandState *cs = g_new0(GACommandState, 1);
     cs->groups = NULL;
     return cs;
 }
-- 
1.9.1