///////////////////////////////////////////////////////////////////////////////
//
//                          IMPORTANT NOTICE
//
// The following open source license statement does not apply to any
// entity in the Exception List published by FMSoft.
//
// For more information, please visit:
//
// https://www.fmsoft.cn/exception-list
//
//////////////////////////////////////////////////////////////////////////////
/*
 *   This file is part of MiniGUI, a mature cross-platform windowing
 *   and Graphics User Interface (GUI) support system for embedded systems
 *   and smart IoT devices.
 *
 *   Copyright (C) 2002~2018, Beijing FMSoft Technologies Co., Ltd.
 *   Copyright (C) 1998~2002, WEI Yongming
 *
 *   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 3 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, see <http://www.gnu.org/licenses/>.
 *
 *   Or,
 *
 *   As this program is a library, any link to this program must follow
 *   GNU General Public License version 3 (GPLv3). If you cannot accept
 *   GPLv3, you need to be licensed from FMSoft.
 *
 *   If you have got a commercial license of this program, please use it
 *   under the terms and conditions of the commercial license.
 *
 *   For more information about the commercial license, please refer to
 *   <http://www.minigui.com/blog/minigui-licensing-policy/>.
 */
/*
** error.c: error handling functions
**
** Some code come from APUE by Richard Stevens.
**
** Current maintainer: Wei Yongming.
**
** Create date: 2000/12/31
*/

#include    <errno.h>        /* for definition of errno */
#include    <stdarg.h>        /* ANSI C header file */

#include    "common.h"

#ifdef _MGRM_PROCESSES

#include    "ourhdr.h"

static void err_doit(int, const char *, va_list);

/* Nonfatal error related to a system call.
 * Print a message and return. */

void
__mg_err_ret(const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    err_doit(1, fmt, ap);
    va_end(ap);
    return;
}

/* Fatal error related to a system call.
 * Print a message and terminate. */

void
__mg_err_sys(const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    err_doit(1, fmt, ap);
    va_end(ap);
    exit(1);
}

/* Fatal error related to a system call.
 * Print a message, dump core, and terminate. */

void
__mg_err_dump(const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    err_doit(1, fmt, ap);
    va_end(ap);
    abort();        /* dump core and terminate */
    exit(1);        /* shouldn't get here */
}

/* Nonfatal error unrelated to a system call.
 * Print a message and return. */

void
__mg_err_msg(const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    err_doit(0, fmt, ap);
    va_end(ap);
    return;
}

/* Fatal error unrelated to a system call.
 * Print a message and terminate. */

void
__mg_err_quit(const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    err_doit(0, fmt, ap);
    va_end(ap);
    exit(1);
}

/* Print a message and return to caller.
 * Caller specifies "errnoflag". */

static void
err_doit(int errnoflag, const char *fmt, va_list ap)
{
    int   errno_save;
    char  buf[MAXLINE];

    errno_save = errno;        /* value caller might want printed */
    vsnprintf(buf, MAXLINE, fmt, ap);

#if 0
    if (errnoflag)
        sprintf(buf+strlen(buf), ": %s", strerror(errno_save));

    strcat(buf, "\n");
    fflush(stdout);        /* in case stdout and stderr are the same */
    fputs(buf, stderr);
    fflush(NULL);        /* flushes all stdio output streams */
#else
    fflush(stdout);        /* in case stdout and stderr are the same */
    if (errnoflag)
        _ERR_PRINTF("%s: %s\n", buf, strerror(errno_save));
    else
        _ERR_PRINTF("%s\n", buf);
    fflush(stdout);        /* in case stdout and stderr are the same */
#endif
    return;
}

#endif