/*      $NetBSD: cmds.c,v 1.37 2014/07/12 05:28:07 mlelstv Exp $        */

/*
 * Copyright (c) 1983, 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[] = "@(#)cmds.c      8.1 (Berkeley) 6/6/93";
#endif
__RCSID("$NetBSD: cmds.c,v 1.37 2014/07/12 05:28:07 mlelstv Exp $");
#endif /* not lint */

#include "tip.h"
#include "pathnames.h"

/*
 * tip
 *
 * miscellaneous commands
 */

int     quant[] = { 60, 60, 24 };

char    null = '\0';
const char      *sep[] = { "second", "minute", "hour" };
static  char *argv[10];         /* argument vector for take and put */

int     args(char *, char **);
int     anyof(char *, const char *);
void    execute(char *);
__dead static void      intcopy(int);
void    prtime(const char *, time_t);
void    stopsnd(int);
void    transfer(char *, int, const char *);
void    transmit(FILE *, const char *, char *);

/*
 * FTP - remote ==> local
 *  get a file from the remote host
 */
void
getfl(char c)
{
        char buf[256], *cp;

        (void)putchar(c);
        /*
         * get the UNIX receiving file's name
         */
        if (prompt("Local file name? ", copyname, sizeof copyname))
                return;
        cp = expand(copyname);
        if ((sfd = open(cp, O_RDWR|O_CREAT, 0666)) < 0) {
                (void)printf("\r\n%s: cannot create\r\n", copyname);
                return;
        }

        /*
         * collect parameters
         */
        if (prompt("List command for remote system? ", buf,
            sizeof buf)) {
                (void)unlink(copyname);
                return;
        }
        transfer(buf, sfd, value(EOFREAD));
}

/*
 * Cu-like take command
 */
/* ARGSUSED */
void
cu_take(char dummy __unused)
{
        int fd, argc;
        char line[BUFSIZ], *cp;

        if (prompt("[take] ", copyname, sizeof copyname))
                return;
        if ((argc = args(copyname, argv)) < 1 || argc > 2) {
                (void)printf("usage: <take> from [to]\r\n");
                return;
        }
        if (argc == 1)
                argv[1] = argv[0];
        cp = expand(argv[1]);
        if ((fd = open(cp, O_RDWR|O_CREAT, 0666)) < 0) {
                (void)printf("\r\n%s: cannot create\r\n", argv[1]);
                return;
        }
        (void)snprintf(line, sizeof line, "cat %s;echo \01", argv[0]);
        transfer(line, fd, "\01");
}

static  jmp_buf intbuf;
/*
 * Bulk transfer routine --
 *  used by getfl(), cu_take(), and pipefile()
 */
void
transfer(char *buf, int fd, const char *eofchars)
{
        int ct;
        char c, buffer[BUFSIZ];
        char * volatile p;
        int cnt, eof;
        time_t start;
        sig_t f;
        char r;

        p = buffer;
        xpwrite(FD, buf, strlen(buf));
        quit = 0;
        (void)write(attndes[1], "W", 1);        /* Put TIPOUT into a wait state */
        (void)read(repdes[0], (char *)&ccc, 1);  /* Wait until read process stops */

        /*
         * finish command
         */
        r = '\r';
        xpwrite(FD, &r, 1);
        do
                (void)read(FD, &c, 1);
        while ((c&STRIP_PAR) != '\n');
        (void)tcsetattr(0, TCSAFLUSH, &defchars);

        (void) setjmp(intbuf);
        f = signal(SIGINT, intcopy);
        start = time(0);
        for (ct = 0; !quit;) {
                eof = read(FD, &c, 1) <= 0;
                c &= STRIP_PAR;
                if (quit)
                        continue;
                if (eof || any(c, eofchars))
                        break;
                if (c == 0)
                        continue;       /* ignore nulls */
                if (c == '\r')
                        continue;
                *p++ = c;

                if (c == '\n' && boolean(value(VERBOSE)))
                        (void)printf("\r%d", ++ct);
                if ((cnt = (p-buffer)) == number(value(FRAMESIZE))) {
                        if (write(fd, buffer, (size_t)cnt) != cnt) {
                                (void)printf("\r\nwrite error\r\n");
                                quit = 1;
                        }
                        p = buffer;
                }
        }
        if ((cnt = (p-buffer)) != 0)
                if (write(fd, buffer, (size_t)cnt) != cnt)
                        (void)printf("\r\nwrite error\r\n");

        if (boolean(value(VERBOSE)))
                prtime(" lines transferred in ", time(0)-start);
        (void)tcsetattr(0, TCSAFLUSH, &term);
        (void)write(fildes[1], (char *)&ccc, 1);
        (void)signal(SIGINT, f);
        (void)close(fd);
}

/*
 * FTP - remote ==> local process
 *   send remote input to local process via pipe
 */
/* ARGSUSED */
void
pipefile(char dummy __unused)
{
        int cpid, pdes[2];
        char buf[256];
        int status, p;

        if (prompt("Local command? ", buf, sizeof buf))
                return;

        if (pipe(pdes)) {
                (void)printf("can't establish pipe\r\n");
                return;
        }

        if ((cpid = fork()) < 0) {
                (void)printf("can't fork!\r\n");
                return;
        } else if (cpid) {
                if (prompt("List command for remote system? ", buf,
                    sizeof buf)) {
                        (void)close(pdes[0]);
                        (void)close(pdes[1]);
                        (void)kill(cpid, SIGKILL);
                } else {
                        (void)close(pdes[0]);
                        (void)signal(SIGPIPE, intcopy);
                        transfer(buf, pdes[1], value(EOFREAD));
                        (void)signal(SIGPIPE, SIG_DFL);
                        while ((p = wait(&status)) > 0 && p != cpid)
                                ;
                }
        } else {
                (void)dup2(pdes[0], 0);
                (void)close(pdes[0]);
                (void)closefrom(3);
                execute(buf);
                (void)printf("can't execl!\r\n");
                exit(0);
        }
}

/*
 * Interrupt service routine for FTP
 */
/* ARGSUSED */
void
stopsnd(int dummy __unused)
{

        stop = 1;
        (void)signal(SIGINT, SIG_IGN);
}

/*
 * FTP - local ==> remote
 *  send local file to remote host
 *  terminate transmission with pseudo EOF sequence
 */
void
sendfile(char cc)
{
        FILE *fd;
        char *fnamex;

        (void)putchar(cc);
        /*
         * get file name
         */
        if (prompt("Local file name? ", fname, sizeof fname))
                return;

        /*
         * look up file
         */
        fnamex = expand(fname);
        if ((fd = fopen(fnamex, "r")) == NULL) {
                (void)printf("%s: cannot open\r\n", fname);
                return;
        }
        transmit(fd, value(EOFWRITE), NULL);
        if (!boolean(value(ECHOCHECK)))
                (void)tcdrain(FD);
}

/*
 * Bulk transfer routine to remote host --
 *   used by sendfile() and cu_put()
 */
void
transmit(FILE *fd, const char *eofchars, char *command)
{
        const char *pc;
        char lastc;
        int c;
        int ccount, lcount;
        time_t start_t, stop_t;
        sig_t f;

        (void)write(attndes[1], "W", 1);        /* put TIPOUT into a wait state */
        stop = 0;
        f = signal(SIGINT, stopsnd);
        (void)tcsetattr(0, TCSAFLUSH, &defchars);
        (void)read(repdes[0], (char *)&ccc, 1);
        if (command != NULL) {
                for (pc = command; *pc; pc++)
                        sendchar(*pc);
                if (boolean(value(ECHOCHECK)))
                        (void)read(FD, &c, (size_t)1);  /* trailing \n */
                else {
                        (void)tcdrain(FD);
                        (void)sleep(5); /* wait for remote stty to take effect */
                }
        }
        lcount = 0;
        lastc = '\0';
        start_t = time(0);
        /* CONSTCOND */
        while (1) {
                ccount = 0;
                do {
                        c = getc(fd);
                        if (stop)
                                goto out;
                        if (c == EOF)
                                goto out;
                        if (c == 0177 && !boolean(value(RAWFTP)))
                                continue;
                        lastc = c;
                        if (c < 040) {
                                if (c == '\n') {
                                        if (!boolean(value(RAWFTP)))
                                                c = '\r';
                                }
                                else if (c == '\t') {
                                        if (!boolean(value(RAWFTP))) {
                                                if (boolean(value(TABEXPAND))) {
                                                        sendchar(' ');
                                                        while ((++ccount % 8) != 0)
                                                                sendchar(' ');
                                                        continue;
                                                }
                                        }
                                } else
                                        if (!boolean(value(RAWFTP)))
                                                continue;
                        }
                        sendchar(c);
                } while (c != '\r' && !boolean(value(RAWFTP)));
                if (boolean(value(VERBOSE)))
                        (void)printf("\r%d", ++lcount);
                if (boolean(value(ECHOCHECK))) {
                        timedout = 0;
                        (void)alarm((unsigned int)number(value(ETIMEOUT)));
                        do {    /* wait for prompt */
                                (void)read(FD, &c, (size_t)1);
                                if (timedout || stop) {
                                        if (timedout)
                                                (void)printf(
                                                    "\r\ntimed out at eol\r\n");
                                        (void)alarm(0);
                                        goto out;
                                }
                        } while ((c&STRIP_PAR) != character(value(PROMPT)));
                        (void)alarm(0);
                }
        }
out:
        if (lastc != '\n' && !boolean(value(RAWFTP)))
                sendchar('\r');
        if (eofchars) {
                for (pc = eofchars; *pc; pc++)
                        sendchar(*pc);
        }
        stop_t = time(0);
        (void)fclose(fd);
        (void)signal(SIGINT, f);
        if (boolean(value(VERBOSE))) {
                if (boolean(value(RAWFTP)))
                        prtime(" chars transferred in ", stop_t-start_t);
                else
                        prtime(" lines transferred in ", stop_t-start_t);
        }
        (void)write(fildes[1], (char *)&ccc, 1);
        (void)tcsetattr(0, TCSAFLUSH, &term);
}

/*
 * Cu-like put command
 */
/* ARGSUSED */
void
cu_put(char dummy __unused)
{
        FILE *fd;
        char line[BUFSIZ];
        int argc;
        char *copynamex;

        if (prompt("[put] ", copyname, sizeof copyname))
                return;
        if ((argc = args(copyname, argv)) < 1 || argc > 2) {
                (void)printf("usage: <put> from [to]\r\n");
                return;
        }
        if (argc == 1)
                argv[1] = argv[0];
        copynamex = expand(argv[0]);
        if ((fd = fopen(copynamex, "r")) == NULL) {
                (void)printf("%s: cannot open\r\n", copynamex);
                return;
        }
        if (boolean(value(ECHOCHECK)))
                (void)snprintf(line, sizeof line, "cat>%s\r", argv[1]);
        else
                (void)snprintf(line, sizeof line, "stty -echo;cat>%s;stty echo\r", argv[1]);
        transmit(fd, "\04", line);
}

/*
 * FTP - send single character
 *  wait for echo & handle timeout
 */
void
sendchar(char c)
{
        char cc;
        int retry = 0;

        cc = c;
        xpwrite(FD, &cc, 1);
#ifdef notdef
        if (number(value(CDELAY)) > 0 && c != '\r')
                nap(number(value(CDELAY)));
#endif
        if (!boolean(value(ECHOCHECK))) {
#ifdef notdef
                if (number(value(LDELAY)) > 0 && c == '\r')
                        nap(number(value(LDELAY)));
#endif
                return;
        }
tryagain:
        timedout = 0;
        (void)alarm((unsigned int)number(value(ETIMEOUT)));
        (void)read(FD, &cc, 1);
        (void)alarm(0);
        if (timedout) {
                (void)printf("\r\ntimeout error (%s)\r\n", ctrl(c));
                if (retry++ > 3)
                        return;
                xpwrite(FD, &null, 1); /* poke it */
                goto tryagain;
        }
}

/* ARGSUSED */
void
alrmtimeout(int dummy __unused)
{

        (void)signal(SIGALRM, alrmtimeout);
        timedout = 1;
}

/*
 * Stolen from consh() -- puts a remote file on the output of a local command.
 *      Identical to consh() except for where stdout goes.
 */
void
pipeout(char c)
{
        char buf[256];
        int cpid, status, p;
        time_t start = 0;

        (void)putchar(c);
        if (prompt("Local command? ", buf, sizeof buf))
                return;
        (void)write(attndes[1], "W", 1);        /* put TIPOUT into a wait state */
        (void)signal(SIGINT, SIG_IGN);
        (void)signal(SIGQUIT, SIG_IGN);
        (void)tcsetattr(0, TCSAFLUSH, &defchars);
        (void)read(repdes[0], (char *)&ccc, 1);
        /*
         * Set up file descriptors in the child and
         *  let it go...
         */
        if ((cpid = fork()) < 0)
                (void)printf("can't fork!\r\n");
        else if (cpid) {
                start = time(0);
                while ((p = wait(&status)) > 0 && p != cpid)
                        ;
        } else {
                (void)dup2(FD, 1);
                (void)closefrom(3);
                (void)signal(SIGINT, SIG_DFL);
                (void)signal(SIGQUIT, SIG_DFL);
                execute(buf);
                (void)printf("can't find `%s'\r\n", buf);
                exit(0);
        }
        if (boolean(value(VERBOSE)))
                prtime("away for ", time(0)-start);
        (void)write(fildes[1], (char *)&ccc, 1);
        (void)tcsetattr(0, TCSAFLUSH, &term);
        (void)signal(SIGINT, SIG_DFL);
        (void)signal(SIGQUIT, SIG_DFL);
}

/*
 * Fork a program with:
 *  0 <-> remote tty in
 *  1 <-> remote tty out
 *  2 <-> local tty out
 */
void
consh(char c)
{
        char buf[256];
        int cpid, status, p;
        time_t start = 0;

        (void)putchar(c);
        if (prompt("Local command? ", buf, sizeof buf))
                return;
        (void)write(attndes[1], "W", 1);        /* put TIPOUT into a wait state */
        (void)signal(SIGINT, SIG_IGN);
        (void)signal(SIGQUIT, SIG_IGN);
        (void)tcsetattr(0, TCSAFLUSH, &defchars);
        (void)read(repdes[0], (char *)&ccc, 1);
        /*
         * Set up file descriptors in the child and
         *  let it go...
         */
        if ((cpid = fork()) < 0)
                (void)printf("can't fork!\r\n");
        else if (cpid) {
                start = time(0);
                while ((p = wait(&status)) > 0 && p != cpid)
                        ;
        } else {
                (void)dup2(FD, 0);
                (void)dup2(FD, 1);
                (void)closefrom(3);
                (void)signal(SIGINT, SIG_DFL);
                (void)signal(SIGQUIT, SIG_DFL);
                execute(buf);
                (void)printf("can't find `%s'\r\n", buf);
                exit(0);
        }
        if (boolean(value(VERBOSE)))
                prtime("away for ", time(0)-start);
        (void)write(fildes[1], (char *)&ccc, 1);
        (void)tcsetattr(0, TCSAFLUSH, &term);
        (void)signal(SIGINT, SIG_DFL);
        (void)signal(SIGQUIT, SIG_DFL);
}

/*
 * Escape to local shell
 */
/* ARGSUSED */
void
shell(char dummy __unused)
{
        int shpid, status;
        const char *cp;

        (void)printf("[sh]\r\n");
        (void)signal(SIGINT, SIG_IGN);
        (void)signal(SIGQUIT, SIG_IGN);
        unraw();
        switch (shpid = fork()) {
        default:
                while (shpid != wait(&status));
                raw();
                (void)printf("\r\n!\r\n");
                (void)signal(SIGINT, SIG_DFL);
                (void)signal(SIGQUIT, SIG_DFL);
                break;
        case 0:
                (void)signal(SIGQUIT, SIG_DFL);
                (void)signal(SIGINT, SIG_DFL);
                if ((cp = strrchr(value(SHELL), '/')) == NULL)
                        cp = value(SHELL);
                else
                        cp++;
                (void)execl(value(SHELL), cp, NULL);
                (void)fprintf(stderr, "\r\n");
                err(1, "can't execl");
                /* NOTREACHED */
        case -1:
                (void)fprintf(stderr, "\r\n");
                err(1, "can't fork");
                /* NOTREACHED */
        }
}

/*
 * TIPIN portion of scripting
 *   initiate the conversation with TIPOUT
 */
void
setscript(void)
{
        char c;
        /*
         * enable TIPOUT side for dialogue
         */
        (void)write(attndes[1], "S", 1);
        if (boolean(value(SCRIPT)) && strlen(value(RECORD)))
                (void)write(fildes[1], value(RECORD), strlen(value(RECORD)));
        (void)write(fildes[1], "\n", 1);
        /*
         * wait for TIPOUT to finish
         */
        (void)read(repdes[0], &c, 1);
        if (c == 'n')
                (void)printf("can't create %s\r\n", (char *)value(RECORD));
}

/*
 * Change current working directory of
 *   local portion of tip
 */
/* ARGSUSED */
void
chdirectory(char dummy __unused)
{
        char dirnam[80];
        const char *cp = dirnam;

        if (prompt("[cd] ", dirnam, sizeof dirnam)) {
                if (stoprompt)
                        return;
                cp = value(HOME);
        }
        if (chdir(cp) < 0)
                (void)printf("%s: bad directory\r\n", cp);
        (void)printf("!\r\n");
}

void
tipabort(const char *msg)
{

        (void)kill(pid, SIGTERM);
        disconnect(msg);
        if (msg != NULL)
                (void)printf("\r\n%s", msg);
        (void)printf("\r\n[EOT]\r\n");
        unraw();
        exit(0);
}

/* ARGSUSED */
void
finish(char dummy __unused)
{
        const char *dismsg;

        dismsg = value(DISCONNECT);
        if (dismsg != NULL && dismsg[0] != '\0') {
                (void)write(FD, dismsg, strlen(dismsg));
                (void)sleep(5);
        }
        tipabort(NULL);
}

/* ARGSUSED */
void
intcopy(int dummy __unused)
{

        raw();
        quit = 1;
        longjmp(intbuf, 1);
}

void
execute(char *s)
{
        const char *cp;

        if ((cp = strrchr(value(SHELL), '/')) == NULL)
                cp = value(SHELL);
        else
                cp++;
        (void)execl(value(SHELL), cp, "-c", s, NULL);
}

int
args(char *buf, char *a[])
{
        char *p = buf, *start;
        char **parg = a;
        int n = 0;

        do {
                while (*p && (*p == ' ' || *p == '\t'))
                        p++;
                start = p;
                if (*p)
                        *parg = p;
                while (*p && (*p != ' ' && *p != '\t'))
                        p++;
                if (p != start)
                        parg++, n++;
                if (*p)
                        *p++ = '\0';
        } while (*p);

        return(n);
}

void
prtime(const char *s, time_t a)
{
        int i;
        int nums[3];

        for (i = 0; i < 3; i++) {
                nums[i] = (int)(a % quant[i]);
                a /= quant[i];
        }
        (void)printf("%s", s);
        while (--i >= 0)
                if (nums[i] || (i == 0 && nums[1] == 0 && nums[2] == 0))
                        (void)printf("%d %s%c ", nums[i], sep[i],
                                nums[i] == 1 ? '\0' : 's');
        (void)printf("\r\n!\r\n");
}

/* ARGSUSED */
void
variable(char dummy __unused)
{
        char    buf[256];

        if (prompt("[set] ", buf, sizeof buf))
                return;
        vlex(buf);
        if (vtable[BEAUTIFY].v_access&CHANGED) {
                vtable[BEAUTIFY].v_access &= ~CHANGED;
                (void)write(attndes[1], "B", 1);        /* Tell TIPOUT to toggle */
        }
        if (vtable[SCRIPT].v_access&CHANGED) {
                vtable[SCRIPT].v_access &= ~CHANGED;
                setscript();
                /*
                 * So that "set record=blah script" doesn't
                 *  cause two transactions to occur.
                 */
                if (vtable[RECORD].v_access&CHANGED)
                        vtable[RECORD].v_access &= ~CHANGED;
        }
        if (vtable[RECORD].v_access&CHANGED) {
                vtable[RECORD].v_access &= ~CHANGED;
                if (boolean(value(SCRIPT)))
                        setscript();
        }
        if (vtable[TAND].v_access&CHANGED) {
                vtable[TAND].v_access &= ~CHANGED;
                if (boolean(value(TAND)))
                        tandem("on");
                else
                        tandem("off");
        }
        if (vtable[LECHO].v_access&CHANGED) {
                vtable[LECHO].v_access &= ~CHANGED;
                HD = boolean(value(LECHO));
        }
        if (vtable[PARITY].v_access&CHANGED) {
                vtable[PARITY].v_access &= ~CHANGED;
                setparity(NULL);        /* XXX what is the correct arg? */
        }
        if (vtable[HARDWAREFLOW].v_access&CHANGED) {
                vtable[HARDWAREFLOW].v_access &= ~CHANGED;
                if (boolean(value(HARDWAREFLOW)))
                        hardwareflow("on");
                else
                        hardwareflow("off");
        }
}

/*
 * Turn tandem mode on or off for remote tty.
 */
void
tandem(const char *option)
{
        struct termios  rmtty;

        (void)tcgetattr(FD, &rmtty);
        if (strcmp(option, "on") == 0) {
                rmtty.c_iflag |= IXON|IXOFF;
                term.c_iflag |= IXON|IXOFF;
        } else {
                rmtty.c_iflag &= ~(IXON|IXOFF);
                term.c_iflag &= ~(IXON|IXOFF);
        }
        (void)tcsetattr(FD, TCSADRAIN, &rmtty);
        (void)tcsetattr(0, TCSADRAIN, &term);
}

/*
 * Turn hardware flow control on or off for remote tty.
 */
void
hardwareflow(const char *option)
{
        struct termios  rmtty;

        (void)tcgetattr(FD, &rmtty);
        if (strcmp(option, "on") == 0)
                rmtty.c_cflag |= CRTSCTS;
        else
                rmtty.c_cflag &= ~CRTSCTS;
        (void)tcsetattr(FD, TCSADRAIN, &rmtty);
}

/*
 * Send a break.
 */
/* ARGSUSED */
void
genbrk(char dummy __unused)
{

        (void)ioctl(FD, TIOCSBRK, NULL);
        (void)sleep(1);
        (void)ioctl(FD, TIOCCBRK, NULL);
}

/*
 * Suspend tip
 */
void
suspend(char c)
{

        unraw();
        (void)kill(c == CTRL('y') ? getpid() : 0, SIGTSTP);
        raw();
}

/*
 *      expand a file name if it includes shell meta characters
 */

char *
expand(char aname[])
{
        static char xname[BUFSIZ];
        char * volatile name;
        char cmdbuf[BUFSIZ];
        int mypid, l;
        char *cp;
        const char *Shell;
        int s, pivec[2];

        name = aname;
        if (!anyof(name, "~{[*?$`'\"\\"))
                return(name);
        if (pipe(pivec) < 0) {
                warn("pipe");
                return(name);
        }
        (void)snprintf(cmdbuf, sizeof cmdbuf, "echo %s", name);
        if ((mypid = vfork()) == 0) {
                Shell = value(SHELL);
                if (Shell == NULL)
                        Shell = _PATH_BSHELL;
                (void)close(pivec[0]);
                (void)close(1);
                (void)dup(pivec[1]);
                (void)close(pivec[1]);
                (void)close(2);
                (void)execl(Shell, Shell, "-c", cmdbuf, NULL);
                _exit(1);
        }
        if (mypid == -1) {
                warn("fork");
                (void)close(pivec[0]);
                (void)close(pivec[1]);
                return(NULL);
        }
        (void)close(pivec[1]);
        l = read(pivec[0], xname, BUFSIZ);
        (void)close(pivec[0]);
        while (wait(&s) != mypid)
                continue;
        s &= 0377;
        if (s != 0 && s != SIGPIPE) {
                (void)fprintf(stderr, "\"Echo\" failed\n");
                return(NULL);
        }
        if (l < 0) {
                warn("read");
                return(NULL);
        }
        if (l == 0) {
                (void)fprintf(stderr, "\"%s\": No match\n", name);
                return(NULL);
        }
        if (l == BUFSIZ) {
                (void)fprintf(stderr, "Buffer overflow expanding \"%s\"\n", name);
                return(NULL);
        }
        xname[l] = 0;
        for (cp = &xname[l-1]; *cp == '\n' && cp > xname; cp--)
                ;
        *++cp = '\0';
        return(xname);
}

/*
 * Are any of the characters in the two strings the same?
 */

int
anyof(char *s1, const char *s2)
{
        int c;

        while ((c = *s1++) != '\0')
                if (any(c, s2))
                        return(1);
        return(0);
}