xstring-buffer: New module.

* lib/string-buffer.h (sb_xappend1, sb_xappend_desc, sb_xappend_c,
sb_xappendvf, sb_xappendf, sb_xcontents_c, sb_xdupfree, sb_xdupfree_c):
New declarations.
* lib/xstring-buffer.c: New file.
* lib/xstring-buffer-printf.c: New file.
* modules/xstring-buffer: New file.

modules/xstring-buffer

@@ -0,0 +1,25 @@
+Description:
+Error-checking functions on a string buffer.
+
+Files:
+lib/xstring-buffer.c
+lib/xstring-buffer-printf.c
+
+Depends-on:
+string-buffer
+xalloc-die
+
+configure.ac:
+gl_MODULE_INDICATOR([xstring-buffer])
+
+Makefile.am:
+lib_SOURCES += xstring-buffer.c xstring-buffer-printf.c
+
+Include:
+"string-buffer.h"
+
+License:
+GPL
+
+Maintainer:
+all