[lttng-tools.git] / src / common / buffer-view.c

/*
 * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License, version 2.1 only,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <common/buffer-view.h>
#include <common/dynamic-buffer.h>
#include <common/macros.h>
#include <common/error.h>
#include <assert.h>

struct lttng_buffer_view lttng_buffer_view_from_view(
		const struct lttng_buffer_view *src, size_t offset,
		ptrdiff_t len)
{
	struct lttng_buffer_view view = { .data = NULL, .size = 0 };

	assert(src);

	if (offset > src->size) {
		ERR("Attempt to create buffer view with invalid offset");
		goto end;
	}

	if (len != -1 && len > (src->size - offset)) {
		ERR("Attempt to create buffer view with invalid length");
		goto end;
	}

	view.data = src->data + offset;
	view.size = len == -1 ? (src->size - offset) : len;
end:
	return view;
}

struct lttng_buffer_view lttng_buffer_view_from_dynamic_buffer(
		const struct lttng_dynamic_buffer *src, size_t offset,
		ptrdiff_t len)
{
	struct lttng_buffer_view view = { .data = NULL, .size = 0 };

	assert(src);

	if (offset > src->size) {
		ERR("Attempt to create buffer view with invalid offset");
		goto end;
	}

	if (len != -1 && len > (src->size - offset)) {
		ERR("Attempt to create buffer view with invalid length");
		goto end;
	}

	view.data = src->data + offset;
	view.size = len == -1 ? (src->size - offset) : len;
end:
	return view;
}
Commit	Line	Data
	1	/*
	2	* Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
	3	*
	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms of the GNU Lesser General Public License, version 2.1 only,
	6	* as published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful, but WITHOUT
	9	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	10	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
	11	* for more details.
	12	*
	13	* You should have received a copy of the GNU Lesser General Public License
	14	* along with this program; if not, write to the Free Software Foundation,
	15	* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	16	*/
	17
	18	#include <common/buffer-view.h>
	19	#include <common/dynamic-buffer.h>
	20	#include <common/macros.h>
	21	#include <common/error.h>
	22	#include <assert.h>
	23
	24	struct lttng_buffer_view lttng_buffer_view_from_view(
	25	const struct lttng_buffer_view *src, size_t offset,
	26	ptrdiff_t len)
	27	{
	28	struct lttng_buffer_view view = { .data = NULL, .size = 0 };
	29
	30	assert(src);
	31
	32	if (offset > src->size) {
	33	ERR("Attempt to create buffer view with invalid offset");
	34	goto end;
	35	}
	36
	37	if (len != -1 && len > (src->size - offset)) {
	38	ERR("Attempt to create buffer view with invalid length");
	39	goto end;
	40	}
	41
	42	view.data = src->data + offset;
	43	view.size = len == -1 ? (src->size - offset) : len;
	44	end:
	45	return view;
	46	}
	47
	48	struct lttng_buffer_view lttng_buffer_view_from_dynamic_buffer(
	49	const struct lttng_dynamic_buffer *src, size_t offset,
	50	ptrdiff_t len)
	51	{
	52	struct lttng_buffer_view view = { .data = NULL, .size = 0 };
	53
	54	assert(src);
	55
	56	if (offset > src->size) {
	57	ERR("Attempt to create buffer view with invalid offset");
	58	goto end;
	59	}
	60
	61	if (len != -1 && len > (src->size - offset)) {
	62	ERR("Attempt to create buffer view with invalid length");
	63	goto end;
	64	}
	65
	66	view.data = src->data + offset;
	67	view.size = len == -1 ? (src->size - offset) : len;
	68	end:
	69	return view;
	70	}