fg_error.c

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/*
 * Copyright (C) 2014 Alexander Zimmermann <alexander.zimmermann@netapp.com>
 *
 * This file is part of Flowgrind.
 *
 * Flowgrind 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.
 *
 * Flowgrind 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 Flowgrind.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */
 
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
 
#include "fg_progname.h"
#include "fg_error.h"
 
void error(enum error_levels level, int errnum, const char *fmt, ...)
{
 
        const char *err_prefix = NULL;
        switch (level) {
        case ERR_WARNING:
                err_prefix = "warning";
                break;
        case ERR_ERROR:
        case ERR_CRIT:
                err_prefix = "error";
                break;
        default:
                err_prefix = "unknown error";
        }
 
        fprintf(stderr, "%s: %s: ", progname, err_prefix);
 
        va_list ap;
        va_start(ap, fmt);
        vfprintf(stderr, fmt, ap);
        va_end(ap);
 
        const char *err_errnum = NULL;
        if (errnum) {
                err_errnum = strerror(errnum);
                if (!err_errnum)
                        err_errnum = "unknown system error";
                fprintf (stderr, ": %s", err_errnum);
        }
 
        fprintf(stderr, "\n");
        fflush (stderr);
 
        if (level > ERR_ERROR)
                exit(EXIT_FAILURE);
}