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buffer: add buffer_init 

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Peter Lieven <pl@kamp.de>
Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
Message-id: 1446203414-4013-3-git-send-email-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann 2015-10-30 12:09:57 +01:00
parent 5c10dbb7b5
commit 810082d15c
2 changed files with 23 additions and 0 deletions
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12
include/qemu/buffer.h
View File

@ -34,11 +34,23 @@ typedef struct Buffer Buffer;
*/ */
struct Buffer { struct Buffer {
char *name;
size_t capacity; size_t capacity;
size_t offset; size_t offset;
uint8_t *buffer; uint8_t *buffer;
}; };
/**
* buffer_init:
* @buffer: the buffer object
* @name: buffer name
*
* Optionally attach a name to the buffer, to make it easier
* to identify in debug traces.
*/
void buffer_init(Buffer *buffer, const char *name, ...)
GCC_FMT_ATTR(2, 3);
/** /**
* buffer_reserve: * buffer_reserve:
* @buffer: the buffer object * @buffer: the buffer object

11
util/buffer.c
View File

@ -22,6 +22,15 @@
#define BUFFER_MIN_INIT_SIZE 4096 #define BUFFER_MIN_INIT_SIZE 4096
void buffer_init(Buffer *buffer, const char *name, ...)
{
va_list ap;
va_start(ap, name);
buffer->name = g_strdup_vprintf(name, ap);
va_end(ap);
}
void buffer_reserve(Buffer *buffer, size_t len) void buffer_reserve(Buffer *buffer, size_t len)
{ {
if ((buffer->capacity - buffer->offset) < len) { if ((buffer->capacity - buffer->offset) < len) {
@ -49,9 +58,11 @@ void buffer_reset(Buffer *buffer)
void buffer_free(Buffer *buffer) void buffer_free(Buffer *buffer)
{ {
g_free(buffer->buffer); g_free(buffer->buffer);
g_free(buffer->name);
buffer->offset = 0; buffer->offset = 0;
buffer->capacity = 0; buffer->capacity = 0;
buffer->buffer = NULL; buffer->buffer = NULL;
buffer->name = NULL;
} }
void buffer_append(Buffer *buffer, const void *data, size_t len) void buffer_append(Buffer *buffer, const void *data, size_t len)