From c6599f0200254a24bb95cfaf6b6e536689c5b9a7 Mon Sep 17 00:00:00 2001
From: Aric Belsito <lluixhi@gmail.com>
Date: Fri, 13 Jan 2017 16:23:18 -0800
Subject: [PATCH] Add obstack_printf function.

---
 Makefile.am      |  2 +-
 obstack.h        |  2 ++
 obstack_printf.c | 18 ++++++++++++++++++
 3 files changed, 21 insertions(+), 1 deletion(-)
 create mode 100644 obstack_printf.c

diff --git a/Makefile.am b/Makefile.am
index 51d2d81..6703fbd 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,6 +1,6 @@
 ## Makefile.am - procress this file with automake to produce Makefile.in
 lib_LTLIBRARIES = libobstack.la
-libobstack_la_SOURCES = obstack.c
+libobstack_la_SOURCES = obstack.c obstack_printf.c
 libobstack_la_HEADERS = obstack.h
 libobstack_ladir = $(includedir)
 ACLOCAL_AMFLAGS = -Im4
diff --git a/obstack.h b/obstack.h
index 23487ba..7d57bf6 100644
--- a/obstack.h
+++ b/obstack.h
@@ -235,6 +235,8 @@ int obstack_alignment_mask (struct obstack *obstack);
 int obstack_chunk_size (struct obstack *obstack);
 int obstack_memory_used (struct obstack *obstack);
 
+int obstack_printf(struct obstack *obstack, const char *__restrict fmt, ...);
+
 /* Error handler called when `obstack_chunk_alloc' failed to allocate
    more memory.  This can be set to a user defined function.  The
    default action is to print a message and abort.  */
diff --git a/obstack_printf.c b/obstack_printf.c
new file mode 100644
index 0000000..ac5a7a3
--- /dev/null
+++ b/obstack_printf.c
@@ -0,0 +1,18 @@
+#include <stdarg.h>
+#include <stdio.h>
+#include <strings.h>
+#include "obstack.h"
+
+int obstack_printf(struct obstack *obstack, const char *__restrict fmt, ...)
+{
+	char buf[1024];
+	va_list ap;
+	int len;
+
+	va_start(ap, fmt);
+	len = vsnprintf(buf, sizeof(buf), fmt, ap);
+	obstack_grow(obstack, buf, len);
+	va_end(ap);
+
+	return len;
+}