[rtems commit] Optimize calloc()

[Sebastian Huber]

Module:    rtems
Branch:    master
Commit:    313f897f10fcf56ad21e7a07f7d70106dccbc188
Changeset: http://git.rtems.org/rtems/commit/?id=313f897f10fcf56ad21e7a07f7d70106dccbc188

Author:    Sebastian Huber <sebastian.huber at embedded-brains.de>
Date:      Thu Sep 13 14:50:08 2018 +0200

Optimize calloc()

Use return value of memset() to enable tail call optimizations.

---

 cpukit/libcsupport/src/calloc.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/cpukit/libcsupport/src/calloc.c b/cpukit/libcsupport/src/calloc.c
index 20db533..78b08ab 100644
--- a/cpukit/libcsupport/src/calloc.c
+++ b/cpukit/libcsupport/src/calloc.c
@@ -28,15 +28,16 @@ void *calloc(
   size_t elsize
 )
 {
-  char   *cptr;
+  void   *cptr;
   size_t  length;
 
   length = nelem * elsize;
   cptr = malloc( length );
   RTEMS_OBFUSCATE_VARIABLE( cptr );
-  if ( cptr )
-    memset( cptr, '\0', length );
+  if ( RTEMS_PREDICT_FALSE( cptr == NULL ) ) {
+    return cptr;
+  }
 
-  return cptr;
+  return memset( cptr, 0, length );
 }
 #endif