From ab74876131f55a954cf867672d678a005208ce7c Mon Sep 17 00:00:00 2001
From: Jan Nieuwenhuizen <janneke@gnu.org>
Date: Thu, 27 Jul 2017 18:51:58 +0200
Subject: [PATCH] mescc: Tinycc support: malloc,memcpy.

* mlibc/libc-mes.c (malloc): Rewrite.
* mlibc/libc-mes+tcc.c (memcpy): Implement.
---
 mlibc/libc-mes+tcc.c | 5 ++++-
 mlibc/libc-mes.c     | 7 ++++---
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/mlibc/libc-mes+tcc.c b/mlibc/libc-mes+tcc.c
index 272e4605..0ada0c1d 100644
--- a/mlibc/libc-mes+tcc.c
+++ b/mlibc/libc-mes+tcc.c
@@ -148,7 +148,10 @@ longjmp (jmp_buf env, int val)
 void *
 memcpy (void *dest, void const *src, size_t n)
 {
-  return 0;
+  char* p = dest;
+  char* q = src;
+  while (n--) *p++ = *q++;
+  return dest;
 }
 
 void *
diff --git a/mlibc/libc-mes.c b/mlibc/libc-mes.c
index 1a60215f..a81727a9 100644
--- a/mlibc/libc-mes.c
+++ b/mlibc/libc-mes.c
@@ -311,10 +311,11 @@ char *g_brk = 0;
 void *
 malloc (size_t size)
 {
-  if (!g_brk) g_brk = brk (0);
+  if (!g_brk)
+    g_brk = brk (0);
+  if (brk (g_brk + size) == -1)
+    return 0;
   char *p = g_brk;
-  if (size < 0 || brk (g_brk + size) == -1)
-      return 0;
   g_brk += size;
   return p;
 }