stdlib.h Add calloc

The pending proc_slw_build HWP wants to use calloc.
Patrick agreed that we should add calloc to Hostboot.

Change-Id: I27dee327446f5b48de33c494231aaa4710f40342
Reviewed-on: http://gfw160.austin.ibm.com:8080/gerrit/893
Tested-by: Jenkins Server
Reviewed-by: A. Patrick Williams III <iawillia@us.ibm.com>
Reviewed-by: Brian H. Horton <brianh@linux.ibm.com>

2 files changed, 16 insertions, 0 deletions

diff --git a/src/include/stdlib.h b/src/include/stdlib.h
index e9995128e..ef2859de5 100644
--- a/src/include/stdlib.h
+++ b/src/include/stdlib.h
@@ -33,6 +33,7 @@ extern "C"
 void* malloc(size_t);
 void free(void*);
 void* realloc(void*, size_t);
+void* calloc(size_t, size_t);
 
 #ifdef __cplusplus
 };
diff --git a/src/lib/stdlib.C b/src/lib/stdlib.C
index d9fa9e9fc..f0c3fad74 100644
--- a/src/lib/stdlib.C
+++ b/src/lib/stdlib.C
@@ -77,3 +77,18 @@ void* realloc(void* p, size_t s)
     return HeapManager::realloc(p,s);
 }    
 
+void* calloc(size_t num, size_t size)
+{
+    // Allocate a block of memory for an array of 'num' elements, each of them
+    // 'size' bytes long and initialize to zero
+    size_t total_size = num * size;
+    void* mem = NULL;
+
+    if (total_size)
+    {
+        mem = malloc(total_size);
+        memset(mem, 0, total_size);
+    }
+
+    return mem;
+}