/*      $NetBSD: cmd1.c,v 1.34 2013/10/18 20:17:59 christos Exp $       */

/*-
 * Copyright (c) 1980, 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[] = "@(#)cmd1.c      8.2 (Berkeley) 4/20/95";
#else
__RCSID("$NetBSD: cmd1.c,v 1.34 2013/10/18 20:17:59 christos Exp $");
#endif
#endif /* not lint */

#include <assert.h>

#include "rcv.h"
#include "extern.h"
#include "format.h"
#ifdef MIME_SUPPORT
#include "mime.h"
#endif
#include "sig.h"
#include "thread.h"


/*
 * Mail -- a mail program
 *
 * User commands.
 */

static int screen;

/*
 * Compute screen size.
 */
static int
screensize(void)
{
        int s;
        char *cp;

        if ((cp = value(ENAME_SCREEN)) != NULL && (s = atoi(cp)) > 0)
                return s;
        return screenheight - 4;
}

/*
 * Print out the header of a specific message.
 * This is a slight improvement to the standard one.
 */
PUBLIC void
printhead(int mesg)
{
        const char *fmtstr;
        char *msgline;

        fmtstr = value(ENAME_HEADER_FORMAT);
        if (fmtstr == NULL)
                fmtstr = DEFAULT_HEADER_FORMAT;
        msgline = smsgprintf(fmtstr, get_message(mesg));
        if (screenwidth > 0)
                msgline[screenwidth] = '\0';
        (void)printf("%s\n", msgline);
        sig_check();
}

/*
 * Print the current active headings.
 * Don't change dot if invoker didn't give an argument.
 */
PUBLIC int
headers(void *v)
{
        int *msgvec;
        int n;
        int flag;
        struct message *mp;
        int size;

        msgvec = v;
        size = screensize();
        n = msgvec[0];
        if (n != 0)
                screen = (n - 1)/size;
        if (screen < 0)
                screen = 0;

        if ((mp = get_message(screen * size + 1)) == NULL) {
                int msgCount;
                msgCount = get_msgCount();
                if (screen * size + 1 > msgCount)
                        mp = get_message(msgCount - size + 1);
                if (mp == NULL)
                        mp = get_message(1);
        }
        flag = 0;
        if (dot != get_message(n))
                dot = mp;
        for (/*EMPTY*/; mp; mp = next_message(mp)) {
                if (mp->m_flag & MDELETED)
                        continue;
                if (flag++ >= size)
                        break;
                printhead(get_msgnum(mp));
        }
        if (flag == 0) {
                (void)printf("No more mail.\n");
                return 1;
        }
        return 0;
}

/*
 * Scroll to the next/previous screen
 */
PUBLIC int
scroll(void *v)
{
        char *arg;
        int s;
        int size;
        int cur[1];

        arg = v;
        cur[0] = 0;
        size = screensize();
        s = screen;
        switch (*arg) {
        case 0:
        case '+':
                s++;
                if (s * size >= get_msgCount()) {
                        (void)printf("On last screenful of messages\n");
                        return 0;
                }
                screen = s;
                break;

        case '-':
                if (--s < 0) {
                        (void)printf("On first screenful of messages\n");
                        return 0;
                }
                screen = s;
                break;

        default:
                (void)printf("Unrecognized scrolling command \"%s\"\n", arg);
                return 1;
        }
        return headers(cur);
}

/*
 * Print out the headlines for each message
 * in the passed message list.
 */
PUBLIC int
from(void *v)
{
        int *msgvec;
        int *ip;

        msgvec = v;
        for (ip = msgvec; *ip != 0; ip++)
                printhead(*ip);
        if (--ip >= msgvec)
                dot = get_message(*ip);
        return 0;
}

/*
 * Print out the value of dot.
 */
/*ARGSUSED*/
PUBLIC int
pdot(void *v)
{
        int *msgvec;

        msgvec = v;
        dot = get_message(msgvec[0]);

        (void)printf("%d\n", get_msgnum(dot));
        return 0;
}

/*
 * Print out all the possible commands.
 */
/*ARGSUSED*/
PUBLIC int
pcmdlist(void *v __unused)
{
        const struct cmd *cp;
        size_t cc;

        (void)printf("Commands are:\n");
        cc = 0;
        for (cp = cmdtab; cp->c_name != NULL; cp++) {
                cc += strlen(cp->c_name) + 2;
                if (cc > 72) {
                        (void)printf("\n");
                        cc = strlen(cp->c_name) + 2;
                }
                if ((cp + 1)->c_name != NULL)
                        (void)printf("%s, ", cp->c_name);
                else
                        (void)printf("%s\n", cp->c_name);
                sig_check();
        }
        return 0;
}


PUBLIC char *
sget_msgnum(struct message *mp, struct message *parent)
{
        char *p;

        if (parent == NULL || parent == mp) {
                (void)sasprintf(&p, "%d", mp->m_index);
                return p;
        }
        p = sget_msgnum(mp->m_plink, parent);

        (void)sasprintf(&p, "%s.%d", p, mp->m_index);
        return p;
}

PUBLIC void
show_msgnum(FILE *obuf, struct message *mp, struct message *parent)
{

        if (value(ENAME_QUIET) == NULL)
                (void)fprintf(obuf, "Message %s:\n", sget_msgnum(mp, parent));
}

struct type1_core_args_s {
        FILE *obuf;
        struct message *parent;
        struct ignoretab *igtab;
        struct mime_info **mip;
};
static int
type1_core(struct message *mp, void *v)
{
        struct type1_core_args_s *args;

        args = v;
        touch(mp);
        show_msgnum(args->obuf, mp, args->parent);
#ifdef MIME_SUPPORT
        if (args->mip == NULL)
                (void)mime_sendmessage(mp, args->obuf, args->igtab, NULL, NULL);
        else {
                *args->mip = mime_decode_open(mp);
                (void)mime_sendmessage(mp, args->obuf, args->igtab, NULL, *args->mip);
                mime_decode_close(*args->mip);
        }
#else
        (void)sendmessage(mp, args->obuf, args->igtab, NULL, NULL);
#endif
        sig_check();
        return 0;
}

/*
 * Respond to a broken pipe signal --
 * probably caused by quitting more.
 */
static jmp_buf  pipestop;

/*ARGSUSED*/
__dead static void
cmd1_brokpipe(int signo __unused)
{

        longjmp(pipestop, 1);
}

/*
 * Type out the messages requested.
 */
#ifndef MIME_SUPPORT
# define type1(a,b,c)           legacy_type1(a,b)
#endif
static int
type1(int *msgvec, int doign, int mime_decode)
{
        int recursive;
        int *ip;
        int msgCount;
        /*
         * Some volatile variables so longjmp will get the current not
         * starting values.  Note it is the variable that is volatile,
         * not what it is pointing at!
         */
        FILE *volatile obuf;            /* avoid longjmp clobbering */
        int * volatile mvec;
        sig_t volatile oldsigpipe;      /* avoid longjmp clobbering? */
#ifdef MIME_SUPPORT
        struct mime_info *volatile mip; /* avoid longjmp clobbering? */

        mip = NULL;
#endif

        mvec = msgvec;
        if ((obuf = last_registered_file(0)) == NULL)
                obuf = stdout;

        /*
         * Even without MIME_SUPPORT, we need to handle SIGPIPE here
         * or else the handler in execute() will grab things and our
         * exit code will never be seen.
         */
        sig_check();
        oldsigpipe = sig_signal(SIGPIPE, cmd1_brokpipe);
        if (setjmp(pipestop))
                goto close_pipe;

        msgCount = get_msgCount();

        recursive = do_recursion();
        for (ip = mvec; *ip && ip - mvec < msgCount; ip++) {
                struct type1_core_args_s args;
                struct message *mp;

                mp = get_message(*ip);
                dot = mp;
                args.obuf = obuf;
                args.parent = recursive ? mp : NULL;
                args.igtab = doign ? ignore : 0;
#ifdef MIME_SUPPORT
                args.mip = mime_decode ? __UNVOLATILE(&mip) : NULL;
#else
                args.mip = NULL;
#endif
                (void)thread_recursion(mp, type1_core, &args);
        }
close_pipe:
#ifdef MIME_SUPPORT
        if (mip != NULL) {
                struct sigaction osa;
                sigset_t oset;

                /*
                 * Ignore SIGPIPE so it can't cause a duplicate close.
                 */
                (void)sig_ignore(SIGPIPE, &osa, &oset);
                mime_decode_close(mip);
                (void)sig_restore(SIGPIPE, &osa, &oset);
        }
#endif
        (void)sig_signal(SIGPIPE, oldsigpipe);
        sig_check();
        return 0;
}

#ifdef MIME_SUPPORT
static int
de_mime(void)
{

        return value(ENAME_MIME_DECODE_MSG) != NULL;
}

/*
 * Identical to type(), but with opposite mime behavior.
 */
PUBLIC int
view(void *v)
{
        int *msgvec;

        msgvec = v;
        return type1(msgvec, 1, !de_mime());
}

/*
 * Identical to Type(), but with opposite mime behavior.
 */
PUBLIC int
View(void *v)
{
        int *msgvec;

        msgvec = v;
        return type1(msgvec, 0, !de_mime());
}
#endif /* MIME_SUPPORT */

/*
 * Type out messages, honor ignored fields.
 */
PUBLIC int
type(void *v)
{
        int *msgvec;

        msgvec = v;
        return type1(msgvec, 1, de_mime());
}

/*
 * Type out messages, even printing ignored fields.
 */
PUBLIC int
Type(void *v)
{
        int *msgvec;

        msgvec = v;
        return type1(msgvec, 0, de_mime());
}

/*
 * Pipe the current message buffer to a command.
 */
PUBLIC int
pipecmd(void *v)
{
        char *cmd;
        FILE *volatile obuf;            /* void longjmp clobbering */
        sig_t volatile oldsigpipe = sig_current(SIGPIPE);

        cmd = v;
        if (dot == NULL) {
                warn("pipcmd: no current message");
                return 1;
        }

        obuf = stdout;
        if (setjmp(pipestop))
                goto close_pipe;

        sig_check();
        obuf = Popen(cmd, "we");
        if (obuf == NULL) {
                warn("pipecmd: Popen failed: %s", cmd);
                return 1;
        }

        oldsigpipe = sig_signal(SIGPIPE, cmd1_brokpipe);

        (void)sendmessage(dot, obuf, ignoreall, NULL, NULL);
 close_pipe:
        sig_check();
        if (obuf != stdout) {
                struct sigaction osa;
                sigset_t oset;
                /*
                 * Ignore SIGPIPE so it can't cause a duplicate close.
                 */
                (void)sig_ignore(SIGPIPE, &osa, &oset);
                (void)Pclose(obuf);
                (void)sig_restore(SIGPIPE, &osa, &oset);
        }
        (void)sig_signal(SIGPIPE, oldsigpipe);
        sig_check();
        return 0;
}

struct top_core_args_s {
        int lineb;
        size_t topl;
        struct message *parent;
};
static int
top_core(struct message *mp, void *v)
{
        char buffer[LINESIZE];
        struct top_core_args_s *args;
        FILE *ibuf;
        size_t lines;
        size_t c;

        args = v;
        touch(mp);
        if (!args->lineb)
                (void)printf("\n");
        show_msgnum(stdout, mp, args->parent);
        ibuf = setinput(mp);
        c = mp->m_lines;
        for (lines = 0; lines < c && lines <= args->topl; lines++) {
                sig_check();
                if (readline(ibuf, buffer, (int)sizeof(buffer), 0) < 0)
                        break;
                (void)puts(buffer);
                args->lineb = blankline(buffer);
        }
        sig_check();
        return 0;
}

/*
 * Print the top so many lines of each desired message.
 * The number of lines is taken from the variable "toplines"
 * and defaults to 5.
 */
PUBLIC int
top(void *v)
{
        struct top_core_args_s args;
        int recursive;
        int msgCount;
        int *msgvec;
        int *ip;
        int topl;
        char *valtop;

        msgvec = v;
        topl = 5;
        valtop = value(ENAME_TOPLINES);
        if (valtop != NULL) {
                topl = atoi(valtop);
                if (topl < 0 || topl > 10000)
                        topl = 5;
        }
        args.topl = topl;
        args.lineb = 1;
        recursive = do_recursion();
        msgCount = get_msgCount();
        for (ip = msgvec; *ip && ip - msgvec < msgCount; ip++) {
                struct message *mp;

                mp = get_message(*ip);
                dot = mp;
                args.parent = recursive ? mp : NULL;
                (void)thread_recursion(mp, top_core, &args);
        }
        return 0;
}

/*
 * Touch all the given messages so that they will
 * get mboxed.
 */
PUBLIC int
stouch(void *v)
{
        int *msgvec;
        int *ip;

        msgvec = v;
        for (ip = msgvec; *ip != 0; ip++) {
                sig_check();
                dot = set_m_flag(*ip, ~(MPRESERVE | MTOUCH), MTOUCH);
        }
        return 0;
}

/*
 * Make sure all passed messages get mboxed.
 */
PUBLIC int
mboxit(void *v)
{
        int *msgvec;
        int *ip;

        msgvec = v;
        for (ip = msgvec; *ip != 0; ip++) {
                sig_check();
                dot = set_m_flag(*ip,
                    ~(MPRESERVE | MTOUCH | MBOX), MTOUCH | MBOX);
        }
        return 0;
}

/*
 * List the folders the user currently has.
 */
/*ARGSUSED*/
PUBLIC int
folders(void *v __unused)
{
        char dirname[PATHSIZE];
        const char *cmd;

        if (getfold(dirname, sizeof(dirname)) < 0) {
                (void)printf("No value set for \"folder\"\n");
                return 1;
        }
        if ((cmd = value(ENAME_LISTER)) == NULL)
                cmd = "ls";
        (void)run_command(cmd, NULL, -1, -1, dirname, NULL);
        return 0;
}

/*
 * Update the mail file with any new messages that have
 * come in since we started reading mail.
 */
/*ARGSUSED*/
PUBLIC int
inc(void *v __unused)
{
        int nmsg;
        int mdot;

        nmsg = incfile();

        if (nmsg == 0) {
                (void)printf("No new mail.\n");
        } else if (nmsg > 0) {
                struct message *mp;
                mdot = newfileinfo(get_abs_msgCount() - nmsg);
                if ((mp = get_message(mdot)) != NULL)
                        dot = mp;
        } else {
                (void)printf("\"inc\" command failed...\n");
        }
        return 0;
}