first and last commit

lib/cbuf/cbuf.c

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+/*
+ * Copyright (C) 2007, 2011, 2014 Apple Inc. All rights reserved.
+ * Copyright (C) 2006 Apple Computer, Inc. All rights reserved.
+ *
+ * This document is the property of Apple Inc.
+ * It is considered confidential and proprietary.
+ *
+ * This document may not be reproduced or transmitted in any form,
+ * in whole or in part, without the express written permission of
+ * Apple Inc.
+ */
+#include <debug.h>
+#include <sys.h>
+#include <lib/heap.h>
+#include <lib/cbuf.h>
+#include <lib/libiboot.h>
+
+#define INC_HEAD(cbuf) ((cbuf)->head = ((cbuf)->head + 1) & (cbuf)->len_mask)
+#define INC_TAIL(cbuf) ((cbuf)->tail = ((cbuf)->tail + 1) & (cbuf)->len_mask)
+
+struct cbuf *cbuf_create(size_t len, struct task_event *event)
+{
+	struct cbuf *buf;
+
+	if (!is_pow2(len))
+		return NULL;
+
+	buf = malloc(sizeof(struct cbuf));
+
+	buf->buf = malloc(len);
+
+	buf->head = 0;
+	buf->tail = 0;
+	buf->has = 0;
+	buf->len = len;
+	buf->len_mask = len - 1;
+
+	buf->event = event;
+	if (buf->event)
+		event_init(buf->event, 0, false);
+
+	return buf;
+}
+
+void cbuf_destroy(struct cbuf *buf)
+{
+	if (buf == 0) return;
+
+	free(buf->buf);
+	free(buf);
+}
+
+ssize_t cbuf_write_char(struct cbuf *buf, char c)
+{
+	ssize_t ret;
+
+	/* if cbuf not valid, drop the character */
+	if (buf == 0) return 1;
+
+	enter_critical_section();
+	
+	if (buf->has == buf->len) {
+		ret = 0;
+		goto out;
+	}
+
+	((char *)buf->buf)[buf->head] = c;
+	INC_HEAD(buf);
+	buf->has++;
+	ret = 1;
+
+	if (buf->event)
+		event_signal(buf->event);
+
+out:
+	exit_critical_section();
+	return ret;
+}
+
+ssize_t cbuf_read_char(struct cbuf *buf, char *c)
+{
+	ssize_t ret;
+
+	/* if cbuf not valid, return nothing */
+	if (buf == 0) return 0;
+
+	enter_critical_section();
+	
+	if (buf->has == 0) {
+		ret = 0;
+		goto out;
+	}
+
+	*c = ((char *)buf->buf)[buf->tail];
+	INC_TAIL(buf);
+	buf->has--;
+	ret = 1;
+
+out:
+	if (buf->event && buf->has == 0)
+		event_unsignal(buf->event);
+
+	exit_critical_section();
+	return ret;
+}

lib/cbuf/library.mk

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+# Copyright (C) 2014 Apple Inc. All rights reserved.
+#
+# This document is the property of Apple Inc.
+# It is considered confidential and proprietary.
+#
+# This document may not be reproduced or transmitted in any form,
+# in whole or in part, without the express written permission of
+# Apple Inc.
+#
+
+LIBCBUF_DIR		:=	$(GET_LOCAL_DIR)
+LIBCBUF_BUILD		:=	$(call TOLIBDIR,$(LIBCBUF_DIR)/LIBCBUF.a)
+COMMONLIBS		+=	LIBCBUF
+
+# Only process the remainder of the makefile if we are building libraries
+#
+ifeq ($(MAKEPHASE),libraries)
+
+GLOBAL_INCLUDES		+=	$(SRCROOT)/arch/arm/include
+
+LIBCBUF_OBJS		:=	$(LIBCBUF_DIR)/cbuf.o
+
+LIBCBUF_OBJS		:=	$(call TOLIBOBJDIR,$(LIBCBUF_OBJS))
+
+ALL_DEPS		+=	$(LIBCBUF_OBJS:%o=%d)
+
+$(LIBCBUF_BUILD):	$(LIBCBUF_OBJS)
+
+endif

lib/cbuf/rules.mk

@@ -0,0 +1,13 @@
+# Copyright (C) 2014 Apple Inc. All rights reserved.
+# Copyright (C) 2006 Apple Computer, Inc. All rights reserved.
+#
+# This document is the property of Apple Inc.
+# It is considered confidential and proprietary.
+#
+# This document may not be reproduced or transmitted in any form,
+# in whole or in part, without the express written permission of
+# Apple Inc.
+#
+OPTIONS		+= WITH_CBUF=1
+LIBRARY_MODULES	+= lib/cbuf
+