sdcc-3.9.0 fork implementing GNU assembler syntax

This fork aims to provide better support for stm8-binutils

1 files changed, 83 insertions, 0 deletions

diff --git a/device/lib/pic16/libc/stdlib/realloc.c b/device/lib/pic16/libc/stdlib/realloc.c
new file mode 100644
index 0000000..ee66864
--- /dev/null
+++ b/device/lib/pic16/libc/stdlib/realloc.c
@@ -0,0 +1,83 @@
+/*-------------------------------------------------------------------------
+   realloc.c - dynamic memory allocation
+
+   Copyright (C) 2004, Vangelis Rokas <vrokas at otenet.gr>
+
+   This library is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by the
+   Free Software Foundation; either version 2, or (at your option) any
+   later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License 
+   along with this library; see the file COPYING. If not, write to the
+   Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
+   MA 02110-1301, USA.
+
+   As a special exception, if you link this library with other files,
+   some of which are compiled with SDCC, to produce an executable,
+   this library does not by itself cause the resulting executable to
+   be covered by the GNU General Public License. This exception does
+   not however invalidate any other reasons why the executable file
+   might be covered by the GNU General Public License.
+-------------------------------------------------------------------------*/
+
+#include <malloc.h>
+
+extern unsigned char _MALLOC_SPEC *heap;
+
+unsigned char _MALLOC_SPEC *realloc(unsigned char _MALLOC_SPEC *mblock, unsigned char len)
+{
+  _malloc_rec _MALLOC_SPEC *pHeap;			/* pointer to block header */
+  _malloc_rec _MALLOC_SPEC *temp;
+  unsigned char bLen;			/* size of block  */
+
+  if(len >= MAX_BLOCK_SIZE)
+    return ((unsigned char _MALLOC_SPEC *)0);
+
+  /* if mblock is NULL, then same as malloc */
+  if(!mblock)
+    return (malloc(len));
+
+  /* if len is 0 */
+  if(len == 0) {
+    free(mblock);
+    return ((unsigned char _MALLOC_SPEC *)0);
+  }
+  
+  pHeap = (_malloc_rec _MALLOC_SPEC *)((unsigned int)mblock - 1);
+  bLen = pHeap->bits.count;
+
+  /* block too small for len bytes + 1 byte header <===> bLen < len + 1 <===> blen <= len */
+  if (bLen <= len) {
+    /* so, new segment has size bigger than the old one, we can return a
+     * valid pointer only when after the block there is an empty block that
+     * can be merged to produce a new block of the requested size, otherwise
+     * we return NULL */
+    temp = _mergeHeapBlock(pHeap, len);
+
+    if(!temp) {
+      /* no could not find a valid block, return NULL */
+      return ((unsigned char _MALLOC_SPEC *)0);
+    }
+
+    //pHeap = temp; /* temp == pHeap */
+    bLen = pHeap->bits.count;
+  }
+
+  len++; /* increase to also count the header */
+  
+  if(bLen > len) {
+    /* new segment is smaller than the old one (or the merged one), that's easy! */
+    pHeap->bits.count = len;
+    temp = (_malloc_rec _MALLOC_SPEC *)((unsigned int)pHeap + len);
+    temp->bits.alloc = 0;
+    temp->bits.count = bLen - len;
+  }
+
+  return (mblock);
+}