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pam_fprintd: Implement auto-pointers and use early-return more around

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Implement simple auto-pointers for the types we use in pam_fprintd with
a basic implementation based on GLib one so that we can have the same
features without having neither an header-dependency on it.
This commit is contained in:
Marco Trevisan (Treviño)
2020-12-05 01:49:29 +01:00
committed by Benjamin Berg
parent 0122d351f9
commit bf2236620e
2 changed files with 120 additions and 106 deletions
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60
pam/pam_fprintd_autoptrs.h Normal file
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/*
* pam_fprint: PAM module for fingerprint authentication through fprintd
* Copyright (C) 2020 Marco Trevisan <marco.trevisan@canonical.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#pragma once
#include <stdlib.h>
/* Define auto-pointers functions, based on GLib Macros */
#define _CLEANUP_FUNC(func) __attribute__((cleanup(func)))
#define _PF_AUTOPTR_FUNC_NAME(TypeName) pf_autoptr_cleanup_##TypeName
#define _PF_AUTOPTR_TYPENAME(TypeName) TypeName##_pf_autoptr
#define PF_DEFINE_AUTOPTR_CLEANUP_FUNC(TypeName, cleanup) \
typedef TypeName *_PF_AUTOPTR_TYPENAME (TypeName); \
static __attribute__((__unused__)) inline void \
_PF_AUTOPTR_FUNC_NAME (TypeName) (TypeName **_ptr) \
{ if (_ptr) (cleanup) (*_ptr); }
#define PF_DEFINE_AUTO_CLEAN_FUNC(TypeName, cleanup) \
static __attribute__((__unused__)) inline void \
_PF_AUTOPTR_FUNC_NAME (TypeName) (TypeName *_ptr) \
{ cleanup (_ptr); }
static inline void
autoptr_cleanup_generic_free (void *p)
{
void **pp = (void**)p;
free (*pp);
}
#define pf_autofree _CLEANUP_FUNC (autoptr_cleanup_generic_free)
#define pf_autoptr(TypeName) \
_CLEANUP_FUNC (_PF_AUTOPTR_FUNC_NAME (TypeName)) \
_PF_AUTOPTR_TYPENAME (TypeName)
#define pf_auto(TypeName) \
_CLEANUP_FUNC (_PF_AUTOPTR_FUNC_NAME (TypeName)) TypeName
PF_DEFINE_AUTOPTR_CLEANUP_FUNC (sd_bus, sd_bus_unref)
PF_DEFINE_AUTOPTR_CLEANUP_FUNC (sd_bus_message, sd_bus_message_unref)
PF_DEFINE_AUTOPTR_CLEANUP_FUNC (sd_bus_slot, sd_bus_slot_unref)
PF_DEFINE_AUTO_CLEAN_FUNC (sd_bus_error, sd_bus_error_free)