StatefulMem* functions should be library functions.

src/platform/vboot_reference/vboot_firmware/stub/utility_stub.c

 /* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  *
  * Stub implementations of utility functions which call their linux-specific
  * equivalents.
  */
 
+#define _STUB_IMPLEMENTATION_
 #include "utility.h"
 
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 
 void error(const char *format, ...) {
   va_list ap;
   va_start(ap, format);
   fprintf(stderr, "ERROR: ");
@@ skipping 42 matching lines @@
   int match = 0;
   const unsigned char* us1 = s1;
   const unsigned char* us2 = s2;
   while (n--) {
     if (*us1++ != *us2++)
       match = 1;
   }
 
   return match;
 }
-
-void* StatefulMemcpy(MemcpyState* state, void* dst,
-                     uint64_t len) {
-  if (state->overrun)
-    return NULL;
-  if (len > state->remaining_len) {
-    state->overrun = 1;
-    return NULL;
-  }
-  Memcpy(dst, state->remaining_buf, len);
-  state->remaining_buf += len;
-  state->remaining_len -= len;
-  return dst;
-}
-
-const void* StatefulMemcpy_r(MemcpyState* state, const void* src,
-                             uint64_t len) {
-  if (state->overrun)
-    return NULL;
-  if (len > state->remaining_len) {
-    state->overrun = 1;
-    return NULL;
-  }
-  Memcpy(state->remaining_buf, src, len);
-  state->remaining_buf += len;
-  state->remaining_len -= len;
-  return src;
-}
-
-const void* StatefulMemset_r(MemcpyState* state, const uint8_t val,
-                             uint64_t len) {
-  if (state->overrun)
-    return NULL;
-  if (len > state->remaining_len) {
-    state->overrun = 1;
-    return NULL;
-  }
-  Memset(state->remaining_buf, val, len);
-  state->remaining_buf += len;
-  state->remaining_len -= len;
-  return state;                         // have to return something non-NULL
-}