msgb: introduce extended copy functions
Those are similar to existing *msgb_alloc*() functions but allows
to change the size of destination msgb provided it fits the
data from source msgb.
Change-Id: I36d4c16241d19f0f73c325be4d0e0bdef6813615
Signed-off-by: Max <msuraev@sysmocom.de>
diff --git a/include/osmocom/core/msgb.h b/include/osmocom/core/msgb.h
index 1e2b023..3fdb189 100644
--- a/include/osmocom/core/msgb.h
+++ b/include/osmocom/core/msgb.h
@@ -70,6 +70,8 @@
int old_size, int new_size);
extern struct msgb *msgb_copy(const struct msgb *msg, const char *name);
extern struct msgb *msgb_copy_c(const void *ctx, const struct msgb *msg, const char *name);
+extern struct msgb *msgb_copy_resize(const struct msgb *msg, uint16_t new_len, const char *name);
+extern struct msgb *msgb_copy_resize_c(const void *ctx, const struct msgb *msg, uint16_t new_len, const char *name);
static int msgb_test_invariant(const struct msgb *msg) __attribute__((pure));
/*! Free all msgbs from a queue built with msgb_enqueue().