/*
- * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ * 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.
+ * SPDX-License-Identifier: LGPL-2.1-only
*
- * 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>
+LTTNG_HIDDEN
+struct lttng_buffer_view lttng_buffer_view_init(
+ const char *src, size_t offset, ptrdiff_t len)
+{
+ struct lttng_buffer_view view = { .data = src + offset, .size = len };
+ return view;
+}
+
+LTTNG_HIDDEN
+bool lttng_buffer_view_is_valid(const struct lttng_buffer_view *view)
+{
+ return view && view->data && view->size > 0;
+}
+
+LTTNG_HIDDEN
struct lttng_buffer_view lttng_buffer_view_from_view(
const struct lttng_buffer_view *src, size_t offset,
ptrdiff_t len)
assert(src);
if (offset > src->size) {
- ERR("Attempt to create buffer view with invalid offset");
+ ERR("Attempt to create buffer view from another view with invalid offset (offset > source size): source size = %zu, offset in source = %zu, length = %zd",
+ src->size, offset, len);
goto end;
}
if (len != -1 && len > (src->size - offset)) {
- ERR("Attempt to create buffer view with invalid length");
+ ERR("Attempt to create buffer view from another view with invalid length (length > space left after offset in source): source size = %zu, offset in source = %zu, length = %zd",
+ src->size, offset, len);
goto end;
}
return view;
}
+LTTNG_HIDDEN
struct lttng_buffer_view lttng_buffer_view_from_dynamic_buffer(
const struct lttng_dynamic_buffer *src, size_t offset,
ptrdiff_t len)
assert(src);
if (offset > src->size) {
- ERR("Attempt to create buffer view with invalid offset");
+ ERR("Attempt to create buffer view from a dynamic buffer with invalid offset (offset > source size): source size = %zu, offset in source = %zu, length = %zd",
+ src->size, offset, len);
goto end;
}
if (len != -1 && len > (src->size - offset)) {
- ERR("Attempt to create buffer view with invalid length");
+ ERR("Attempt to create buffer view from a dynamic buffer with invalid length (length > space left after offset in source): source size = %zu, offset in source = %zu, length = %zd",
+ src->size, offset, len);
goto end;
}
end:
return view;
}
+
+LTTNG_HIDDEN
+bool lttng_buffer_view_contains_string(const struct lttng_buffer_view *buf,
+ const char *str,
+ size_t len_with_null_terminator)
+{
+ const char *past_buf_end;
+ size_t max_str_len_with_null_terminator;
+ size_t str_len;
+ bool ret;
+
+ past_buf_end = buf->data + buf->size;
+
+ /* Is the start of the string in the buffer view? */
+ if (str < buf->data || str >= past_buf_end) {
+ ret = false;
+ goto end;
+ }
+
+ /*
+ * Max length the string could have to fit in the buffer, including
+ * NULL terminator.
+ */
+ max_str_len_with_null_terminator = past_buf_end - str;
+
+ /* Could the string even fit in the buffer? */
+ if (len_with_null_terminator > max_str_len_with_null_terminator) {
+ ret = false;
+ goto end;
+ }
+
+ str_len = lttng_strnlen(str, max_str_len_with_null_terminator);
+ if (str_len != (len_with_null_terminator - 1)) {
+ ret = false;
+ goto end;
+ }
+
+ ret = true;
+
+end:
+ return ret;
+}