Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / lib / circbuf.c

diff --git a/qemu/roms/u-boot/lib/circbuf.c b/qemu/roms/u-boot/lib/circbuf.c
new file mode 100644 (file)
index 0000000..9848da3
--- /dev/null
+++ b/qemu/roms/u-boot/lib/circbuf.c
@@ -0,0 +1,97 @@
+/*
+ * (C) Copyright 2003
+ * Gerry Hamel, geh@ti.com, Texas Instruments
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+#include <malloc.h>
+
+#include <circbuf.h>
+
+
+int buf_init (circbuf_t * buf, unsigned int size)
+{
+       assert (buf != NULL);
+
+       buf->size = 0;
+       buf->totalsize = size;
+       buf->data = (char *) malloc (sizeof (char) * size);
+       assert (buf->data != NULL);
+
+       buf->top = buf->data;
+       buf->tail = buf->data;
+       buf->end = &(buf->data[size]);
+
+       return 1;
+}
+
+int buf_free (circbuf_t * buf)
+{
+       assert (buf != NULL);
+       assert (buf->data != NULL);
+
+       free (buf->data);
+       memset (buf, 0, sizeof (circbuf_t));
+
+       return 1;
+}
+
+int buf_pop (circbuf_t * buf, char *dest, unsigned int len)
+{
+       unsigned int i;
+       char *p = buf->top;
+
+       assert (buf != NULL);
+       assert (dest != NULL);
+
+       /* Cap to number of bytes in buffer */
+       if (len > buf->size)
+               len = buf->size;
+
+       for (i = 0; i < len; i++) {
+               dest[i] = *p++;
+               /* Bounds check. */
+               if (p == buf->end) {
+                       p = buf->data;
+               }
+       }
+
+       /* Update 'top' pointer */
+       buf->top = p;
+       buf->size -= len;
+
+       return len;
+}
+
+int buf_push (circbuf_t * buf, const char *src, unsigned int len)
+{
+       /* NOTE:  this function allows push to overwrite old data. */
+       unsigned int i;
+       char *p = buf->tail;
+
+       assert (buf != NULL);
+       assert (src != NULL);
+
+       for (i = 0; i < len; i++) {
+               *p++ = src[i];
+               if (p == buf->end) {
+                       p = buf->data;
+               }
+               /* Make sure pushing too much data just replaces old data */
+               if (buf->size < buf->totalsize) {
+                       buf->size++;
+               } else {
+                       buf->top++;
+                       if (buf->top == buf->end) {
+                               buf->top = buf->data;
+                       }
+               }
+       }
+
+       /* Update 'tail' pointer */
+       buf->tail = p;
+
+       return len;
+}