Add support for asnprintf, and improve *printf documentation.

	* libc/stdio/Makefile.am (ELIX_SOURCES): Rename...
	(ELIX_2_SOURCES): ...to this.
	(ELIX_4_SOURCES): Add new variable.  Build asnprintf.
	(GENERAL_SOURCES): Move dprintf to ELIX_4_SOURCES.
	(CHEWOUT_FILES): Include diprintf in documentation.
	* libc/stdio/Makefile.in: Regenerate.
	* libc/stdio/diprintf.c: Improve documentation.
	* libc/stdio/dprintf.c: Likewise.
	* libc/stdio/siprintf.c: Likewise.
	* libc/stdio/sprintf.c: Likewise.
	* libc/stdio/vfprintf.c: Likewise.
	* libc/stdio/viprintf.c: Likewise.
	* libc/stdio/vsniprintf.c: Consolidate documentation.
	* libc/stdio/asiprintf.c: Refer to documentation.
	* libc/stdio/asprintf.c: Likewise.
	* libc/stdio/fiprintf.c: Likewise.
	* libc/stdio/fprintf.c: Likewise.
	* libc/stdio/iprintf.c: Likewise.
	* libc/stdio/printf.c: Likewise.
	* libc/stdio/sniprintf.c: Likewise.
	* libc/stdio/vdiprintf.c: Likewise.
	* libc/stdio/vdprintf.c: Likewise.
	* libc/stdio/vsiprintf.c: Likewise.
	* libc/stdio/fvwrite.c (__sfvwrite_r): Handle asnprintf.
	* libc/stdio/asniprintf.c (asniprintf, _asniprintf_r): New file.
	* libc/stdio/asnprintf.c (asnprintf, _asnprintf_r): New file.
	* libc/stdio/vasniprintf.c (vasniprintf, _vasniprintf_r): New
	file.
	* libc/stdio/vasnprintf.c (vasnprintf, _vasnprintf_r): New file.
	* libc/stdio/vdprintf.c (_vdprintf_r): Rewrite to avoid malloc in
	typical case.
	* libc/stdio/vdiprintf.c (_vdiprintf_r): Likewise.
	* libc/include/stdio.h: Add prototypes for new functions; sort
	existing functions.

1 files changed, 7 insertions, 4 deletions

diff --git a/newlib/libc/stdio/vdprintf.c b/newlib/libc/stdio/vdprintf.c
index 617d9db1f..8a20235ef 100644
--- a/newlib/libc/stdio/vdprintf.c
+++ b/newlib/libc/stdio/vdprintf.c
@@ -2,6 +2,7 @@
  * Permission to use, copy, modify, and distribute this software
  * is freely granted, provided that this notice is preserved.
  */
+/* doc in dprintf.c */
 
 #include <_ansi.h>
 #include <reent.h>
@@ -18,14 +19,16 @@ _DEFUN(_vdprintf_r, (ptr, fd, format, ap),
        va_list ap)
 {
   char *p;
-  int n;
+  char buf[512];
+  size_t n = sizeof buf;
 
   _REENT_SMALL_CHECK_INIT (ptr);
-  n = _vasprintf_r (ptr, &p, format, ap);
-  if (n == -1)
+  p = _vasnprintf_r (ptr, buf, &n, format, ap);
+  if (!p)
     return -1;
   n = _write_r (ptr, fd, p, n);
-  _free_r (ptr, p);
+  if (p != buf)
+    _free_r (ptr, p);
   return n;
 }