SoW-2019-0002: Dynamic Snapshot

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

diff --git a/src/common/buffer-view.c b/src/common/buffer-view.c
index 4bdb1eb7d75d48be514689200954d69c44a7809b..1065423913b060980bcfd316586882e1f0b0e267 100644 (file)
--- a/src/common/buffer-view.c
+++ b/src/common/buffer-view.c
@@ -67,3 +67,45 @@ struct lttng_buffer_view lttng_buffer_view_from_dynamic_buffer(
 end:
        return view;
 }
+
+LTTNG_HIDDEN
+bool lttng_buffer_view_validate_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;
+}