/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1991, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Kenneth Almquist.
 *
 * 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.
 */

/*
 * Routines to check for mail.  (Perhaps make part of main.c?)
 */

#include "shell.h"
#include "mail.h"
#include "var.h"
#include "output.h"
#include "memalloc.h"
#include "error.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>


#define MAXMBOXES 10


static int nmboxes;                     /* number of mailboxes */
static time_t mailtime[MAXMBOXES];      /* times of mailboxes */



/*
 * Print appropriate message(s) if mail has arrived.  If the argument is
 * non-zero, then the value of MAIL has changed, so we just update the
 * values.
 */

void
chkmail(int silent)
{
        int i;
        char *mpath;
        char *p;
        char *msg;
        struct stackmark smark;
        struct stat statb;

        if (silent)
                nmboxes = 10;
        if (nmboxes == 0)
                return;
        setstackmark(&smark);
        mpath = stsavestr(mpathset()? mpathval() : mailval());
        for (i = 0 ; i < nmboxes ; i++) {
                p = mpath;
                if (*p == '\0')
                        break;
                mpath = strchrnul(mpath, ':');
                if (*mpath != '\0') {
                        *mpath++ = '\0';
                        if (p == mpath - 1)
                                continue;
                }
                msg = strchr(p, '%');
                if (msg != NULL)
                        *msg++ = '\0';
#ifdef notdef /* this is what the System V shell claims to do (it lies) */
                if (stat(p, &statb) < 0)
                        statb.st_mtime = 0;
                if (statb.st_mtime > mailtime[i] && ! silent) {
                        out2str(msg? msg : "you have mail");
                        out2c('\n');
                }
                mailtime[i] = statb.st_mtime;
#else /* this is what it should do */
                if (stat(p, &statb) < 0)
                        statb.st_size = 0;
                if (statb.st_size > mailtime[i] && ! silent) {
                        out2str(msg? msg : "you have mail");
                        out2c('\n');
                }
                mailtime[i] = statb.st_size;
#endif
        }
        nmboxes = i;
        popstackmark(&smark);
}