/*
 * Taken from OpenSSH 3.9p1 and slightly modified
 * (BSD license)
 */

/* Based on conf.c from UCB sendmail 8.8.8 */

/*
 * Copyright 2003 Damien Miller
 * Copyright (c) 1983, 1995-1997 Eric P. Allman
 * Copyright (c) 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 */

#ifdef WIN32

void compat_init_setproctitle(int argc, char *argv[]) {}
void setproctitle(const char *fmt, ...) {}

#else

# include <string.h>
# include <unistd.h>
# include <stdarg.h>
# include <stdio.h>
# include <stdlib.h>
static char *argv_start = NULL;
static size_t argv_env_len = 0;

void compat_init_setproctitle(int argc, char *argv[])
{
    extern char **environ;
    char *lastargv = NULL;
    char **envp = environ;
    int i;

    /*
     * NB: This assumes that argv has already been copied out of the
     * way. This is true for sshd, but may not be true for other 
     * programs. Beware.
     */

    if (argc == 0 || argv[0] == NULL)
	return;

    /* Fail if we can't allocate room for the new environment */
    for (i = 0; envp[i] != NULL; i++)
	;
    if ((environ = (char**) malloc(sizeof(*environ) * (i + 1))) == NULL) {
	environ = envp;	/* put it back */
	return;
    }

    /*
     * Find the last argv string or environment variable within 
     * our process memory area.
     */
    for (i = 0; i < argc; i++) {
	if (lastargv == NULL || lastargv + 1 == argv[i])
	    lastargv = argv[i] + strlen(argv[i]);
    }
    for (i = 0; envp[i] != NULL; i++) {
	if (lastargv + 1 == envp[i])
	    lastargv = envp[i] + strlen(envp[i]);
    }

    argv[1] = NULL;
    argv_start = argv[0];
    argv_env_len = lastargv - argv[0] - 1;

    /* 
     * Copy environment 
     * XXX - will truncate env on strdup fail
     */
    for (i = 0; envp[i] != NULL; i++)
	environ[i] = strdup(envp[i]);
    environ[i] = NULL;
}

void setproctitle(const char *fmt, ...)
{
    va_list ap;
    char buf[1024] = "";

    if (argv_env_len <= 0)
	return;

    va_start(ap, fmt);
    if (fmt != NULL) {
	vsnprintf(buf, sizeof(buf), fmt, ap);
    }
    va_end(ap);

    strncpy(argv_start, buf, argv_env_len);
}

#endif