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authorVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>2018-03-13 15:34:00 -0400
committerJohn Snow <jsnow@redhat.com>2018-03-13 17:05:55 -0400
commitf0d64cb72916b3086b51d5933de74e98c8586612 (patch)
tree883e47bd5e035b3f250f5ac0dec60306becd0ddc
parentdd6bb91450cae3f8a4ddac465712fa8ae8cd2c7c (diff)
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migration/qemu-file: add qemu_put_counted_string()
Add function opposite to qemu_get_counted_string. qemu_put_counted_string puts one-byte length of the string (string should not be longer than 255 characters), and then it puts the string, without last zero byte. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: John Snow <jsnow@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Message-id: 20180313180320.339796-9-vsementsov@virtuozzo.com
-rw-r--r--migration/qemu-file.c13
-rw-r--r--migration/qemu-file.h2
2 files changed, 15 insertions, 0 deletions
diff --git a/migration/qemu-file.c b/migration/qemu-file.c
index 2ab2bf3..e85f501 100644
--- a/migration/qemu-file.c
+++ b/migration/qemu-file.c
@@ -734,6 +734,19 @@ size_t qemu_get_counted_string(QEMUFile *f, char buf[256])
}
/*
+ * Put a string with one preceding byte containing its length. The length of
+ * the string should be less than 256.
+ */
+void qemu_put_counted_string(QEMUFile *f, const char *str)
+{
+ size_t len = strlen(str);
+
+ assert(len < 256);
+ qemu_put_byte(f, len);
+ qemu_put_buffer(f, (const uint8_t *)str, len);
+}
+
+/*
* Set the blocking state of the QEMUFile.
* Note: On some transports the OS only keeps a single blocking state for
* both directions, and thus changing the blocking on the main
diff --git a/migration/qemu-file.h b/migration/qemu-file.h
index aae4e5e..f4f356a 100644
--- a/migration/qemu-file.h
+++ b/migration/qemu-file.h
@@ -174,4 +174,6 @@ size_t ram_control_save_page(QEMUFile *f, ram_addr_t block_offset,
ram_addr_t offset, size_t size,
uint64_t *bytes_sent);
+void qemu_put_counted_string(QEMUFile *f, const char *name);
+
#endif