Cleanup xmalloc.

* admin/coccinelle/xzalloc.cocci: Semantic patch to convert
calls to xmalloc with following memset to xzalloc.
* src/lisp.h (xzalloc): New prototype.  Omit needless casts.
* src/alloc.c (xzalloc): New function.  Omit needless casts.
* src/charset.c: Omit needless casts.  Convert all calls to
malloc with following memset to xzalloc.
* src/dispnew.c: Likewise.
* src/fringe.c: Likewise.
* src/image.c: Likewise.
* src/sound.c: Likewise.
* src/term.c: Likewise.
* src/w32fns.c: Likewise.
* src/w32font.c: Likewise.
* src/w32term.c: Likewise.
* src/xfaces.c: Likewise.
* src/xfns.c: Likewise.
* src/xterm.c: Likewise.
* src/atimer.c: Omit needless casts.
* src/buffer.c: Likewise.
* src/callproc.c: Likewise.
* src/ccl.c: Likewise.
* src/coding.c: Likewise.
* src/composite.c: Likewise.
* src/doc.c: Likewise.
* src/doprnt.c: Likewise.
* src/editfns.c: Likewise.
* src/emacs.c: Likewise.
* src/eval.c: Likewise.
* src/filelock.c: Likewise.
* src/fns.c: Likewise.
* src/gtkutil.c: Likewise.
* src/keyboard.c: Likewise.
* src/lisp.h: Likewise.
* src/lread.c: Likewise.
* src/minibuf.c: Likewise.
* src/msdos.c: Likewise.
* src/print.c: Likewise.
* src/process.c: Likewise.
* src/region-cache.c: Likewise.
* src/search.c: Likewise.
* src/sysdep.c: Likewise.
* src/termcap.c: Likewise.
* src/terminal.c: Likewise.
* src/tparam.c: Likewise.
* src/w16select.c: Likewise.
* src/w32.c: Likewise.
* src/w32reg.c: Likewise.
* src/w32select.c: Likewise.
* src/w32uniscribe.c: Likewise.
* src/widget.c: Likewise.
* src/xdisp.c: Likewise.
* src/xmenu.c: Likewise.
* src/xrdb.c: Likewise.
* src/xselect.c: Likewise.

1 files changed, 19 insertions, 3 deletions

diff --git a/src/alloc.c b/src/alloc.c
index ed5d6b5099f..6ef0782ca1b 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -735,6 +735,22 @@ xmalloc (size_t size)
   return val;
 }
 
+/* Like the above, but zeroes out the memory just allocated.  */
+
+void *
+xzalloc (size_t size)
+{
+  void *val;
+
+  MALLOC_BLOCK_INPUT;
+  val = malloc (size);
+  MALLOC_UNBLOCK_INPUT;
+
+  if (!val && size)
+    memory_full (size);
+  memset (val, 0, size);
+  return val;
+}
 
 /* Like realloc but check for no memory and block interrupt input..  */
 
@@ -867,7 +883,7 @@ char *
 xstrdup (const char *s)
 {
   size_t len = strlen (s) + 1;
-  char *p = (char *) xmalloc (len);
+  char *p = xmalloc (len);
   memcpy (p, s, len);
   return p;
 }
@@ -3881,7 +3897,7 @@ mem_insert (void *start, void *end, enum mem_type type)
   if (x == NULL)
     abort ();
 #else
-  x = (struct mem_node *) xmalloc (sizeof *x);
+  x = xmalloc (sizeof *x);
 #endif
   x->start = start;
   x->end = end;
@@ -5047,7 +5063,7 @@ pure_alloc (size_t size, int type)
   /* Don't allocate a large amount here,
      because it might get mmap'd and then its address
      might not be usable.  */
-  purebeg = (char *) xmalloc (10000);
+  purebeg = xmalloc (10000);
   pure_size = 10000;
   pure_bytes_used_before_overflow += pure_bytes_used - size;
   pure_bytes_used = 0;