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-rw-r--r--src/vppinfra/vec.h40
1 files changed, 40 insertions, 0 deletions
diff --git a/src/vppinfra/vec.h b/src/vppinfra/vec.h
index eed96d6b9c2..d70e9ce1276 100644
--- a/src/vppinfra/vec.h
+++ b/src/vppinfra/vec.h
@@ -145,6 +145,46 @@ _vec_resize (void *v,
data_align));
}
+/** \brief Low-level vector resize predicate
+
+ @param v pointer to a vector
+ @param length_increment length increment in elements
+ @param data_bytes requested size in bytes
+ @param header_bytes header size in bytes (may be zero)
+ @param data_align alignment (may be zero)
+ @return v_prime pointer to resized vector, may or may not equal v
+*/
+
+always_inline int
+_vec_resize_will_expand (void *v,
+ word length_increment,
+ uword data_bytes, uword header_bytes,
+ uword data_align)
+{
+ vec_header_t *vh = _vec_find (v);
+ uword new_data_bytes, aligned_header_bytes;
+
+ aligned_header_bytes = vec_header_bytes (header_bytes);
+
+ new_data_bytes = data_bytes + aligned_header_bytes;
+
+ if (PREDICT_TRUE (v != 0))
+ {
+ void *p = v - aligned_header_bytes;
+
+ /* Vector header must start heap object. */
+ ASSERT (clib_mem_is_heap_object (p));
+
+ /* Typically we'll not need to resize. */
+ if (new_data_bytes <= clib_mem_size (p))
+ {
+ vh->len += length_increment;
+ return 0;
+ }
+ }
+ return 1;
+}
+
/** \brief Predicate function, says whether the supplied vector is a clib heap
object (general version).