/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright 2018 Jason King.
 * Copyright 2018, Joyent, Inc.
 */

#include <dlfcn.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <demangle-sys.h>

#include "dis_util.h"

int g_error;    /* global process exit status, set when warn() is called */

/*
 * Fatal error.  Print out the error with a leading "dis: ", and then exit the
 * program.
 */
void
die(const char *fmt, ...)
{
        va_list ap;

        (void) fprintf(stderr, "dis: fatal: ");

        va_start(ap, fmt);
        (void) vfprintf(stderr, fmt, ap);
        va_end(ap);

        (void) fprintf(stderr, "\n");

        exit(1);
}

/*
 * Non-fatal error.  Print out the error with a leading "dis: ", set the global
 * error flag, and return.
 */
void
warn(const char *fmt, ...)
{
        va_list ap;

        (void) fprintf(stderr, "dis: warning: ");

        va_start(ap, fmt);
        (void) vfprintf(stderr, fmt, ap);
        va_end(ap);

        (void) fprintf(stderr, "\n");

        g_error = 1;
}

/*
 * Convenience wrapper around malloc() to cleanly exit if any allocation fails.
 */
void *
safe_malloc(size_t size)
{
        void *ret;

        if ((ret = calloc(1, size)) == NULL)
                die("Out of memory");

        return (ret);
}


/*
 * Since the -C flag explicitly says C++, for now at least, force language to
 * C++
 */
const char *
dis_demangle(const char *name)
{
        static char *demangled_name = NULL;

        /*
         * Since demangled_name is static, it may be preserved across
         * invocations.  As such, make sure any memory that might be present
         * from previous invocations is freed.
         */
        free(demangled_name);
        demangled_name = sysdemangle(name, SYSDEM_LANG_AUTO, NULL);
        return ((demangled_name != NULL) ? demangled_name : name);
}