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Commit 2ca280f0 authored by Colin Walters's avatar Colin Walters
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Introduce glnx-alloca.h with glnx_strjoina()

This is taken from systemd, and is really useful when one has a few
known-to-be-small strings one wants to concatenate without resorting
to malloc.
parent 194eb7a0
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......@@ -18,6 +18,7 @@
EXTRA_DIST += $(libglnx_srcpath)/README.md $(libglnx_srcpath)/COPYING
libglnx_la_SOURCES = \
$(libglnx_srcpath)/glnx-alloca.h \
$(libglnx_srcpath)/glnx-backport-autocleanups.h \
$(libglnx_srcpath)/glnx-backport-autoptr.h \
$(libglnx_srcpath)/glnx-backports.h \
......
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
*
* Copyright (C) 2014,2015 Colin Walters <walters@verbum.org>.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#pragma once
#include <stdlib.h>
#include <glib.h>
G_BEGIN_DECLS
/* Taken from https://github.com/systemd/systemd/src/basic/string-util.h
* at revision v228-666-gcf6c8c4
*/
#define glnx_strjoina(a, ...) \
({ \
const char *_appendees_[] = { a, __VA_ARGS__ }; \
char *_d_, *_p_; \
int _len_ = 0; \
unsigned _i_; \
for (_i_ = 0; _i_ < G_N_ELEMENTS(_appendees_) && _appendees_[_i_]; _i_++) \
_len_ += strlen(_appendees_[_i_]); \
_p_ = _d_ = alloca(_len_ + 1); \
for (_i_ = 0; _i_ < G_N_ELEMENTS(_appendees_) && _appendees_[_i_]; _i_++) \
_p_ = stpcpy(_p_, _appendees_[_i_]); \
*_p_ = 0; \
_d_; \
})
G_END_DECLS
......@@ -24,6 +24,7 @@
G_BEGIN_DECLS
#include <glnx-alloca.h>
#include <glnx-local-alloc.h>
#include <glnx-backport-autocleanups.h>
#include <glnx-backports.h>
......
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