Do away with memcpy/memset/memcmp

Now everything is either explicitly a rep thing, or explicitly some
other small run of reasonably efficient instructions. No library calls
or function call overhead of any kind. Code size remains nice and small.

Ban a few other bad libc functions while we're at it. More can be added
later if we decide that's a useful idea.

This will require some discipline and workarounds to cope with Clang's
tendency to shove mem* calls in places you don't want them even when you
tell it not to. Well, c'est la vie.

I'm a little nervous that the __builtin_memmove() usage in shuntvars()
could still one day emit actual library calls. It appears we're not
importing memmove() from anywhere at the moment, though. So I guess it's
good enough for now.

Also I had to get rid of alloca() in con_.c but that was kind of bad
anyway, so that's fine.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/l4dmm.c b/src/l4dmm.c
index 67af36d..343ea0d 100644
--- a/src/l4dmm.c
+++ b/src/l4dmm.c
@@ -95,7 +95,7 @@ const char *l4dmm_curcampaign() {
 		// reasonable...
 		usize len = strlen(ret);
 		if_cold (len > sizeof(campaignbuf) - 1) ret = 0;
-		else ret = memcpy(campaignbuf, ret, len + 1);
+		else ret = mem_copy(campaignbuf, ret, len + 1);
 	}
 	kvsys_free(kv);
 	return ret;