reallocarray: check for ptrdiff_t overflow

* doc/glibc-functions/reallocarray.texi (reallocarray):
Mention ptrdiff_t overflow.
* lib/reallocarray.c (reallocarray): Reindent as per usual GNU.
* lib/stdlib.in.h (reallocarray): Allow reallocarray to be replaced.
* m4/reallocarray.m4 (gl_FUNC_REALLOCARRAY):
Check for ptrdiff_t overflow.
* m4/stdlib_h.m4 (gl_STDLIB_H_DEFAULTS): Set up REPLACE_REALLOCARRAY.
* modules/reallocarray (Files): Add malloc.m4.
(configure.ac): Also test REPLACE_REALLOCARRAY.
* modules/reallocarray-tests (Depends-on): Add stdint.
* modules/stdlib (stdlib.h): Substitute REPLACE_REALLOCARRAY.
* tests/test-reallocarray.c: Include stdint.h.
(main): Check for ptrdiff_t overflow.

1 files changed, 8 insertions, 8 deletions

diff --git a/lib/reallocarray.c b/lib/reallocarray.c
index d10d7d5f57..03197c601b 100644
--- a/lib/reallocarray.c
+++ b/lib/reallocarray.c
@@ -27,12 +27,12 @@
 void *
 reallocarray (void *ptr, size_t nmemb, size_t size)
 {
-    if (xalloc_oversized (nmemb, size))
-      {
-        errno = ENOMEM;
-        return NULL;
-      }
-
-    /* Rely on the semantics of GNU realloc.  */
-    return realloc (ptr, nmemb * size);
+  if (xalloc_oversized (nmemb, size))
+    {
+      errno = ENOMEM;
+      return NULL;
+    }
+
+  /* Rely on the semantics of GNU realloc.  */
+  return realloc (ptr, nmemb * size);
 }