/*      $NetBSD: pmon.c,v 1.6 2009/12/14 00:45:59 matt Exp $    */

/*-
 * Copyright (c) 2001 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pmon.c,v 1.6 2009/12/14 00:45:59 matt Exp $");

#include <sys/param.h>
#include <sys/systm.h>

#include <machine/pmon.h>

#ifdef _LP64
static char *environ[64];
#else
static char **environ;
#endif

/*
 * pmon_init:
 *
 *      Initialize the PMON interface.
 */
void
pmon_init(char *envp[])
{
#ifdef _LP64
        int32_t *envp32 = (void *) envp;

        envp = environ;
        if (envp32 != NULL) {
                while (*envp32 != 0) {
                        KASSERT(envp - environ < __arraycount(environ));
                        *envp++ = (char *)(intptr_t)*envp32++;
                }
        }
        KASSERT(envp - environ < __arraycount(environ));
        *envp = NULL;
#else
        if (environ == NULL)
                environ = envp;
#endif
#ifdef PMON_DEBUG
        printf("pmon_init: environ = %p (%p)\n", environ, *environ);
#endif
}

/*
 * pmon_getenv:
 *
 *      Fetch an environment variable.
 */
const char *
pmon_getenv(const char *var)
{
        const char *rv = NULL;
        char **env = environ;
        int i;

        i = strlen(var);

        while (*env != NULL) {
#ifdef PMON_DEBUG
                printf("pmon_getenv: %s\n", *env);
#endif
                if (strncasecmp(var, *env, i) == 0 &&
                    (*env)[i] == '=') {
                        rv = &(*env)[i + 1];
                        break;
                }
                env++;
        }

        return (rv);
}