2 files changed, 29 insertions, 0 deletions
diff --git a/src/include/stdlib.h b/src/include/stdlib.h
index 46c463119..69afb84a4 100644
--- a/src/include/stdlib.h
+++ b/src/include/stdlib.h
@@ -10,6 +10,7 @@ extern "C"
 
 void* malloc(size_t);
 void free(void*);
+void* realloc(void*, size_t);
 
 #ifdef __cplusplus
 };
diff --git a/src/lib/stdlib.C b/src/lib/stdlib.C
index 5bf0d87f6..8aa6b36eb 100644
--- a/src/lib/stdlib.C
+++ b/src/lib/stdlib.C
@@ -1,4 +1,5 @@
 #include <stdlib.h>
+#include <string.h>
 #include <kernel/heapmgr.H>
 #include <kernel/pagemgr.H>
 
@@ -33,3 +34,30 @@ void free(void* p)
 	HeapManager::free(p);
     }
 }
+
+void* realloc(void* p, size_t s)
+{
+    if (NULL == p) return malloc(s);
+    
+    size_t* len = (size_t*)p;
+    len--;
+
+    size_t cur_size;
+    if ((*len) > 0xff)
+    {
+        cur_size = ((*len) >> 8) * PageManager::PAGESIZE - 8;
+    }
+    else
+    {
+        cur_size = (1 << (*len + 4)) - 8;
+    }
+    
+    if (s < cur_size)
+        return p;
+
+    void* new_p = malloc(s);
+    memcpy(new_p, p, cur_size);
+    free(p);
+
+    return new_p;
+}