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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
*
* Copyright (C) 2014,2015 Colin Walters <walters@verbum.org>.
* SPDX-License-Identifier: LGPL-2.0-or-later
*
* 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 <glnx-backport-autocleanups.h>
#include <errno.h>
G_BEGIN_DECLS
gboolean glnx_throw (GError **error, const char *fmt, ...) G_GNUC_PRINTF (2,3);
/* Like `glnx_throw ()`, but returns %NULL. */
#define glnx_null_throw(error, args...) \
({glnx_throw (error, args); NULL;})
/* Implementation detail of glnx_throw_prefix() */
void glnx_real_set_prefix_error_va (GError *error,
const char *format,
va_list args) G_GNUC_PRINTF (2,0);
gboolean glnx_prefix_error (GError **error, const char *fmt, ...) G_GNUC_PRINTF (2,3);
/* Like `glnx_prefix_error ()`, but returns %NULL. */
#define glnx_prefix_error_null(error, args...) \
({glnx_prefix_error (error, args); NULL;})
/**
* GLNX_AUTO_PREFIX_ERROR:
*
* An autocleanup-based macro to automatically call `g_prefix_error()` (also with a colon+space `: `)
* when it goes out of scope. This is useful when one wants error strings built up by the callee
* function, not all callers.
*
* ```
* gboolean start_http_request (..., GError **error)
* {
* GLNX_AUTO_PREFIX_ERROR ("HTTP request", error)
*
* if (!libhttp_request_start (..., error))
* return FALSE;
* ...
* return TRUE;
* ```
*/
typedef struct {
const char *prefix;
GError **error;
} GLnxAutoErrorPrefix;
static inline void
glnx_cleanup_auto_prefix_error (GLnxAutoErrorPrefix *prefix)
{
if (prefix->error && *(prefix->error))
g_prefix_error (prefix->error, "%s: ", prefix->prefix);
}
G_DEFINE_AUTO_CLEANUP_CLEAR_FUNC(GLnxAutoErrorPrefix, glnx_cleanup_auto_prefix_error)
#define GLNX_AUTO_PREFIX_ERROR(text, error) \
G_GNUC_UNUSED g_auto(GLnxAutoErrorPrefix) _GLNX_MAKE_ANONYMOUS(_glnxautoprefixerror_) = { text, error }
/* Set @error using the value of `g_strerror (errno)`.
*
* This function returns %FALSE so it can be used conveniently in a single
* statement:
*
* ```
* if (unlinkat (fd, somepathname) < 0)
* return glnx_throw_errno (error);
* ```
*/
static inline gboolean
glnx_throw_errno (GError **error)
{
/* Save the value of errno, in case one of the
* intermediate function calls happens to set it.
*/
int errsv = errno;
g_set_error_literal (error, G_IO_ERROR,
g_io_error_from_errno (errsv),
g_strerror (errsv));
/* We also restore the value of errno, since that's
* what was done in a long-ago libgsystem commit
* https://git.gnome.org/browse/libgsystem/commit/?id=ed106741f7a0596dc8b960b31fdae671d31d666d
* but I certainly can't remember now why I did that.
*/
errno = errsv;
return FALSE;
}
/* Like glnx_throw_errno(), but yields a NULL pointer. */
#define glnx_null_throw_errno(error) \
({glnx_throw_errno (error); NULL;})
/* Implementation detail of glnx_throw_errno_prefix() */
void glnx_real_set_prefix_error_from_errno_va (GError **error,
gint errsv,
const char *format,
va_list args) G_GNUC_PRINTF (3,0);
gboolean glnx_throw_errno_prefix (GError **error, const char *fmt, ...) G_GNUC_PRINTF (2,3);
/* Like glnx_throw_errno_prefix(), but yields a NULL pointer. */
#define glnx_null_throw_errno_prefix(error, args...) \
({glnx_throw_errno_prefix (error, args); NULL;})
/* BEGIN LEGACY APIS */
#define glnx_set_error_from_errno(error) \
do { \
glnx_throw_errno (error); \
} while (0);
#define glnx_set_prefix_error_from_errno(error, format, args...) \
do { \
glnx_throw_errno_prefix (error, format, args); \
} while (0);
G_END_DECLS
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