/*      $NetBSD: util.c,v 1.11 2006/12/15 22:45:34 christos Exp $       */

/*-
 * Copyright (c) 1992, 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.
 */

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)util.c      8.2 (Berkeley) 4/2/94";
#else
__RCSID("$NetBSD: util.c,v 1.11 2006/12/15 22:45:34 christos Exp $");
#endif
#endif /* not lint */

#include <sys/param.h>
#include <sys/stat.h>
#include <sys/wait.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <paths.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "extern.h"

char *
colon(char *cp)
{
        if (*cp == ':')         /* Leading colon is part of file name. */
                return (0);

        for (; *cp; ++cp) {
                if (*cp == ':')
                        return (cp);
                if (*cp == '/')
                        return (0);
        }
        return (0);
}

char *
unbracket(char *cp)
{
        char *ep;

        if (*cp == '[') {
                ep = cp + (strlen(cp) - 1);
                if (*ep == ']') {
                        *ep = '\0';
                        ++cp;
                }
        }
        return (cp);
}

void
verifydir(char *cp)
{
        struct stat stb;

        if (!stat(cp, &stb)) {
                if (S_ISDIR(stb.st_mode))
                        return;
                errno = ENOTDIR;
        }
        run_err("%s: %s", cp, strerror(errno));
        exit(1);
        /* NOTREACHED */
}

int
okname(char *cp0)
{
        int c;
        char *cp;

        cp = cp0;
        do {
                c = *cp;
                if (c & 0200)
                        goto bad;
                if (!isalpha(c) && !isdigit(c) && c != '_' && c != '-')
                        goto bad;
        } while (*++cp);
        return (1);

bad:    warnx("%s: invalid user name", cp0);
        return (0);
}

int
susystem(char *s)
{
        sig_t istat, qstat;
        int status;
        pid_t pid;

        pid = vfork();
        switch (pid) {
        case -1:
                return (127);
        
        case 0:
                (void)execl(_PATH_BSHELL, "sh", "-c", s, NULL);
                _exit(127);
                /* NOTREACHED */
        }
        istat = signal(SIGINT, SIG_IGN);
        qstat = signal(SIGQUIT, SIG_IGN);
        if (waitpid(pid, &status, 0) < 0)
                status = -1;
        (void)signal(SIGINT, istat);
        (void)signal(SIGQUIT, qstat);
        return (status);
}

BUF *
allocbuf(BUF *bp, int fd, int blksize)
{
        struct stat stb;
        size_t size;
        char *nbuf;

        if (fstat(fd, &stb) < 0) {
                run_err("fstat: %s", strerror(errno));
                return (0);
        }
        size = roundup(stb.st_blksize, blksize);
        if (size == 0)
                size = blksize;
        if (bp->cnt >= size)
                return (bp);
        if ((nbuf = realloc(bp->buf, size)) == NULL) {
                free(bp->buf);
                bp->buf = NULL;
                bp->cnt = 0;
                run_err("%s", strerror(errno));
                return (0);
        }
        bp->buf = nbuf;
        bp->cnt = size;
        return (bp);
}

void
/*ARGSUSED*/
lostconn(int signo __unused)
{
        if (!iamremote)
                warnx("lost connection");
        exit(1);
        /* NOTREACHED */
}