sandbox: Add os_realloc()

We provide os_malloc() and os_free() but not os_realloc(). Add this,
following the usual semantics. Also update os_malloc() to behave correctly
when passed a zero size.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

1 files changed, 11 insertions, 1 deletions

diff --git a/include/os.h b/include/os.h
index 65bcb232ca..fd010cfee8 100644
--- a/include/os.h
+++ b/include/os.h
@@ -114,7 +114,7 @@ void os_fd_restore(void);
  * os_malloc() - aquires some memory from the underlying os.
  *
  * @length:	Number of bytes to be allocated
- * Return:	Pointer to length bytes or NULL on error
+ * Return:	Pointer to length bytes or NULL if @length is 0 or on error
  */
 void *os_malloc(size_t length);
 
@@ -128,6 +128,16 @@ void *os_malloc(size_t length);
 void os_free(void *ptr);
 
 /**
+ * os_realloc() - reallocate memory
+ *
+ * This follows the semantics of realloc(), so can perform an os_malloc() or
+ * os_free() depending on @ptr and @length.
+ *
+ * Return:	Pointer to reallocated memory or NULL if @length is 0
+ */
+void *os_realloc(void *ptr, size_t length);
+
+/**
  * os_usleep() - access to the usleep function of the os
  *
  * @usec:	time to sleep in micro seconds