Usenet 1994 October/usenetsourcesnewsgroupsinfomagicoctober1994disk2.iso/misc/volume10/pcmail2/part06

Text File | 1990-01-24 | 65KB | 2,275 lines

Newsgroups: comp.sources.misc
subject: v10i038: PC-MAIL release 2, 6/11
from: [e-mail] (Wietse Venema)
Sender: [e-mail] (Brandon S. Allbery - comp.sources.misc)

Posting-number: Volume 10, Issue 38
Submitted-by: [e-mail] (Wietse Venema)
Archive-name: pcmail2/part06

#! /bin/sh
# This is a shell archive.  Remove anything before this line, then unpack
# it by saving it into a file and typing "sh file".  To overwrite existing
# files, type "sh file -c".  You can also feed this as standard input via
# unshar, or by typing "sh <file", e.g..  If this archive is complete, you
# will see the following message at the end:
#        "End of archive 6 (of 11)."
# Contents:  main/connect.c main/email.c main/gmail.c main/gphys.c
#   main/gpres.c main/mbox.c main/nmail.c main/startup.c main/str.c
# Wrapped by wswietse@tuewsa on Mon Jan 22 17:27:18 1990
PATH=/bin:/usr/bin:/usr/ucb ; export PATH
if test -f main/connect.c -a "${1}" != "-c" ; then
  echo shar: Will not over-write existing file \"main/connect.c\"
else
echo shar: Extracting \"main/connect.c\" \(6857 characters\)
sed "s/^X//" >main/connect.c <<'END_OF_main/connect.c'
X/*++
X/* NAME
X/*      connect 3
X/* SUMMARY
X/*      pre- and post protocol host access
X/* PROJECT
X/*      pc-mail
X/* PACKAGE
X/*      cico
X/* SYNOPSIS
X/*      int connect()
X/*
X/*      int disconnect()
X/* DESCRIPTION
X/*      connect() tries to make a connection to the remote host
X/*      and to log on, using the dial-up script and login-name
X/*    entries in the communications parameter file, and the password
X/*    provided as command-line parameter to the cico program.
X/*    A UUCP-like send/expect script facility is used. Thus a login
X/*    sequence might look like:
X/*
X/*    send expect send expect ...
X/*
X/*    The program will send the first "send" string, then expect the
X/*    first "expect" string, and so on.
X/*
X/*    Alternative expect/send sequences can be specified in the usual manner:
X/*
X/*    expect-send-expect-send-expect...
X/*
X/*    If the first expect string fails, the alternative send string is
X/*    transmitted and the alternative expect is tried, and so on, until
X/*    an expect string succeeds, or until the list of alternatives is
X/*    exhausted.
X/*
X/*    After the dial-up script has completed the program
X/*    proceeds with the following build-in send/expect sequence:
X/*
X/*    ogin: your_login_name\\r ssword: your_password\\r
X/*
X/*      disconnect() tries to break a connection, using the disconnect
X/*      entry in the communications parameter file. Unlike connect()
X/*    this function is not driven by a send-expect script.
X/*
X/*    The following escape sequences are recognized in send or expect
X/*    strings:
X/*
X/* .nf
X/*    \\b    backspace
X/*    \\r    carriage return
X/*    \\n    newline
X/*    \\t    tab
X/*    \\s    space
X/*    \\f    form feed
X/*    \\nnn    octal character value
X/*    \\\\    a real backslash
X/* .fi
X/*
X/*    In addition, the following "send" strings are given special
X/*    treatment:
X/*
X/* .nf
X/*    BREAK    send a null character
X/*    EOT    send Control-D
X/* FUNCTIONS AND MACROS
X/*      xwrite(), xgetc(), trap(), debug(4)(), log(), split()
X/* FILES
X/*      $MAILDIR/s00000        communications parameter file
X/*    $MAILDIR/LOGFILE    system logfile
X/* SEE ALSO
X/*      params(5)       communications parameter file entries
X/* DIAGNOSTICS
X/*      connect() returns a status E_BADSETUP if the systems parameter
X/*    file contains bad data, and E_NOLINE if the login script fails.
X/* AUTHOR(S)
X/*      W.Z. Venema
X/*      Eindhoven University of Technology
X/*      Department of Mathematics and Computer Science
X/*      Den Dolech 2, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
X/* CREATION DATE
X/*      Fri Mar 27 17:11:12 GMT+1:00 1987
X/* LAST MODIFICATION
X/*    90/01/22 13:01:26
X/* VERSION/RELEASE
X/*    2.1
X/*--*/
X
X#include <stdio.h>
X#include <setjmp.h>
X#include <ctype.h>
X
X#include "defs.h"
X#include "params.h"
X#include "status.h"
X#include "comm.h"
X#include "logs.h"
X#include "sysdep.h"
X
Xhidden char *blnk = " \t";        /* send/expect separators */
X
X/* forward declarations */
X
Xhidden void conn_send();
Xhidden void conn_xpct();
Xhidden char *escape();
X
X/* connect - connect to remote system; simple script processing with retries */
X
Xpublic int connect()
X{
X    int    *savetrap = systrap;        /* save exception handler */
X    jmp_buf mytrap;            /* our exception handler */
X    int     retval;            /* completion code */
X    char   *seq = DIAL_SEQUENCE;
X    register char *cp;
X
X    /* set up exception handler */
X
X    if (retval = setjmp(systrap = mytrap)) {    /* get here if expect fails */
X    systrap = savetrap;            /* it just happened */
X    return (retval);
X    }
X    /* optional dial-up sequence */
X
X    for (cp = split(&seq, blnk); cp; cp = split(&seq, blnk)) {
X    conn_send(escape(cp));
X    if (cp = split(&seq, blnk))
X        conn_xpct(escape(cp));
X    }
X
X    /* mandatory login sequence; hack this for non-UNIX hosts */
X
X    conn_xpct("ogin:");
X    conn_send(strcons("%s\r", LOGIN_NAME));
X    conn_xpct("ssword:");
X    conn_send(strcons("%s\r", password));
X
X    /* restore exception handler */
X
X    systrap = savetrap;                /* get here if expect wins */
X    return (0);                    /* say no problems... */
X}
X
X/* disconnect - disconnect line */
X
Xpublic int disconnect()
X{
X    conn_send(escape(DISC_SEQUENCE));        /* send disconnect sequence */
X    return (0);                    /* always succeeds... */
X}
X
X/* conn_send - send BREAK, EOT or string literal */
X
Xhidden void conn_send(s)
Xregister char *s;
X{
X    static char null = '\0';
X    static char eot = '\04';
X
X    sleep(1);
X
X    if (*s) {
X    debug(4) ("Sending: %S\n", s);
X    if (strcmp(s, "BREAK") == 0) {
X        xwrite(ttfd, &null, 1);
X    } else if (strcmp(s, "EOT") == 0) {
X        xwrite(ttfd, &eot, 1);
X    } else {
X        while (*s) {
X        delay();
X        xwrite(ttfd, s++, 1);
X        }
X    }
X    }
X}
X
X/* conn_xpct - pattern matching without meta characters */
X
Xhidden void conn_xpct(s)
Xchar   *s;
X{
X    int     c;
X    int     i;
X    int     n;
X    char   *xp;
X    char   *sp;
X
X    /*
X     * Keep listening until we time out or until we receive the expected
X     * string (thus, if the other end keeps sending garbage we will never
X     * terminate). Make sure that we do not overrun our buffer. Parity bits
X     * are ignored. If we do not succeed, try alternative sequences if they
X     * are specified.
X     */
X
X    for (xp = split(&s, "-"); xp; xp = split(&s, "-")) {
X
X    debug(4) ("Expecting: %S\nReceiving: ", xp);
X
X    if (((n = strlen(xp)) > MSGBUF))
X        n = MSGBUF;
X    for (i = 0; (c = xgetc()) != EOF; /* void */ ) {
X        msgin[i++] = (c &= 0177);
X        debug(4) ("%C", c);
X        if (i >= n && strncmp(xp, &msgin[i - n], n) == 0) {
X        debug(4) (" ok!\n");
X        return;
X        } else if (i >= MSGBUF) {
X        strncpy(msgin, &msgin[i - (n - 1)], n - 1);
X        i = n - 1;
X        }
X    }
X    debug(4) (" failed!\n");
X
X    /* try alternative sequence, if specified, else fail */
X
X    if (sp = split(&s, "-")) {
X        conn_send(sp);
X    } else {
X        trap(E_NOLINE, "LOGIN FAILED (at \"%S\")", xp);
X    }
X    }
X}
X
X/* escape - interpret backslash sequences */
X
Xhidden char *escape(s)
Xregister char *s;
X{
X    static char buf[BUFSIZ];
X    register char *cp = buf;
X    register char ch;
X    int     c;
X    int     i;
X
X    while (*s && cp < buf + sizeof(buf) - 1) {    /* don't overflow the buffer */
X
X    if (*s != '\\') {            /* ordinary character */
X        *cp++ = *s++;
X    } else if (isdigit(*++s) && *s < '8') {    /* \nnn octal code */
X        sscanf(s, "%3o", &c);
X        *cp++ = c;
X        i = 1;
X        s++;
X        while (i++ < 3 && isdigit(*s) && *s < '8')
X        s++;
X    } else if ((ch = *s++) == 0) {        /* at string terminator */
X        break;
X    } else if (ch == 'b') {            /* \b becomes backspace */
X        *cp++ = '\b';
X    } else if (ch == 'f') {            /* \f becomes formfeed */
X        *cp++ = '\f';
X    } else if (ch == 'n') {            /* \n becomes newline */
X        *cp++ = '\n';
X    } else if (ch == 'r') {            /* \r becomes carriage ret */
X        *cp++ = '\r';
X    } else if (ch == 's') {            /* \s becomes blank */
X        *cp++ = ' ';
X    } else if (ch == 't') {            /* \t becomes tab */
X        *cp++ = '\t';
X    } else {                /* \any becomes any */
X        *cp++ = ch;
X    }
X    }
X    *cp = '\0';                    /* terminate the result */
X    return (buf);
X}
END_OF_main/connect.c
if test 6857 -ne `wc -c <main/connect.c`; then
    echo shar: \"main/connect.c\" unpacked with wrong size!
fi
# end of overwriting check
fi
if test -f main/email.c -a "${1}" != "-c" ; then
  echo shar: Will not over-write existing file \"main/email.c\"
else
echo shar: Extracting \"main/email.c\" \(6160 characters\)
sed "s/^X//" >main/email.c <<'END_OF_main/email.c'
X/*++
X/* NAME
X/*    email 3
X/* SUMMARY
X/*    manipulate one message in preparation
X/* PROJECT
X/*    pc-mail
X/* PACKAGE
X/*    mail
X/* SYNOPSIS
X/*    #include "mail.h"
X/*
X/*    int work()
X/*
X/*    int work_disp(def_addr)
X/*    char *def_addr;
X/* DESCRIPTION
X/*      The functions in this module are responsible for manipulations
X/*    on mail messages in preparation.
X/*
X/*    work() should be invoked when the user has selected an existing
X/*    message in preparation. It does some initializations and invokes
X/*    the work_disp() function.
X/*
X/*      work_disp() allows the user to specify the disposition of a
X/*    mail message in preparation. It should be used after the user has
X/*    created a message, or after the user has selected a message in
X/*    preparation.
X/*
X/*    The message file is displayed on the screen and user the
X/*    can choose to print, mail, edit or delete etc. the message.
X/*
X/*    The def_addr argument contains a default mail destination: for example,
X/*    an address extracted from a message being replied to. It should be an
X/*    e-mail address or an empty string.
X/*
X/*    The code in this module is a little tricky, to avoid "orphan" work
X/*    files (message file without a metafile).
X/* COMMANDS
X/*    The program specified in the EDITOR environment variable,
X/*    or a system-dependent default.
X/* FILES
X/*    mail.msg, file being edited in the current directory
X/*      $MAILDIR/ennnnn, message file (body)
X/*    $MAILDIR/cnnnnn, meta file (summary)
X/*    $MAILDIR/header, template mail header file
X/*    $MAILDIR/trailer, template signature file
X/* SEE ALSO
X/*      pager(3), pager(5), kbdinp(3), edit(3)
X/* AUTHOR(S)
X/*      W.Z. Venema
X/*      Eindhoven University of Technology
X/*      Department of Mathematics and Computer Science
X/*      Den Dolech 2, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
X/* CREATION DATE
X/*    Tue May 12 15:35:20 GMT+1:00 1987
X/* LAST MODIFICATION
X/*    90/01/22 13:01:35
X/* VERSION/RELEASE
X/*    2.1
X/*--*/
X
X#include <stdio.h>
X#include <sys/types.h>
X#include <sys/stat.h>
X
X#include <errno.h>
X#include "defs.h"
X#include "path.h"
X#include "pager.h"
X#include "screen.h"
X#include "mail.h"
X#include "status.h"
X
X/* forward declarations */
X
Xhidden void junk_work();
Xhidden int edit_work();
Xhidden int show_work();
Xhidden int hold_work();
Xhidden int send_work();
Xhidden int queue_work();
X
Xpublic char address[MAXLINE];        /* default destination */
Xhidden File *workfile = 0;        /* pager file */
X
X/* work - user selected message in preparation */
X
Xpublic int work()
X{
X    return (work_disp(""));
X}
X
X/* work_disp - ask disposition of a message in preparation */
X
Xpublic int work_disp(def_addr)
Xchar *def_addr;
X{
X    static Screen screen[] = {
X    'C',    "Close",hold_work,"Send message later, return to message-selection menu",
X#ifdef    ATTACH
X    'A',    "Attach",attach", "Attach file to message",
X#endif
X    'D',    "Delete",delete,  delcurr,
X    'E',    "Edit",    edit_work,"Edit this message",
X    'M',    "Mail",    send_work,"Send this message to destination",
X    'P',    "Print",print,      printcurr,
X    PGUP,    PgUp,    pu_pager, pageup,
X    PGDN,    PgDn,    pd_pager, pagedn,
X    UP,    "Up",    up_pager, csrup,
X    DOWN,    "Down",    dn_pager, csrdn,
X    0,    0,    show_work,
X    "(Reading a message in preparation)",
X    };
X    struct stat s;
X
X    strcpy(address, def_addr);            /* set up default address */
X    kbdinp(screen);                /* ask disposition */
X    junk_work();                /* destroy mail pager file */
X    return (S_REDRAW);                /* say screen was changed */
X}
X
X/* show_work - show message in preparation or error message in middle window */
X
Xhidden int show_work()
X{
X    if (workfile) {                /* check pager file exists */
X    set_pager(workfile);            /* select existing display */
X    } else if (rd_pager(workfile = open_pager(), message)) {
X    mesg_pager(workfile, m_msgread);    /* cannot display message */
X    }
X    ds_pager();                    /* (re)draw display */
X    return (0);                    /* screen is up-to-date */
X}
X
X/* junk_work - destroy message in preparation display */
X
Xhidden void junk_work()
X{
X    if (workfile) {                /* no-op if no display */
X    close_pager(workfile);            /* release memory */
X    workfile = 0;                /* say it is gone */
X    }
X}
X
X/* edit_work - edit a message in preparation */
X
Xhidden int edit_work()
X{
X    register int stat;
X
X    if (stat = edit(message, MAILFILE))        /* try to edit the message */
X    errdisp(stat);                /* edit() had a problem */
X    junk_work();                /* force new message display */
X    return (S_REDRAW);                /* say screen has changed */
X}
X
Xhidden int label_work();
X
X/* hold_work - stop editing but do not yet mail a message in preparation */
X
Xhidden int hold_work()
X{
X    static Screen screen[] = {
X    STRING,    0, label_work, int_error,
X    0,    0, 0,
X    getsummary,
X    };
X    struct stat s;
X
X    /*
X     * The user does not yet want to send the message off. The purpose of the
X     * following code is to ask for a one-line summary, but only if such a
X     * comment does not yet exist. The summary is used to identify the
X     * message in preparation in the message- selection display.
X     */
X
X    if (stat(message, &s) || !stat(comment, &s)) {
X    return (S_BREAK);            /* we are done here */
X    } else {
X    return (kbdinp(screen) | S_REDRAW);    /* ask for a summary */
X    }
X}
X
X/* label_work - save summary line to meta file */
X
Xhidden  label_work(string)
Xchar   *string;
X{
X    register int stat;
X
X    if (stat = metafile(comment, string, (char *) 0)) {
X    errdisp(stat);                /* oops, notify the user */
X    return (S_REDRAW);            /* say screen has changed */
X    } else {
X    chmod(comment, 0444);            /* make comments read-only */
X    junk_desk();                /* say mail box has changed */
X    return (S_BREAK);            /* say no more work */
X    }
X}
X
X/* send_work - user wants to send message in preparation, ask for destination */
X
Xhidden int send_work()
X{
X    static Screen screen[] = {
X    EDIT,    0,    queue_work,    address,
X    0,    0,    when,
X    "Press ESC to cancel. Send message to:",
X    };
X
X    return (kbdinp(screen) | S_REDRAW);
X}
X
X/* queue_work - spool mail, delete message in preparation and meta file */
X
Xhidden int queue_work(to)
Xchar   *to;
X{
X    register int stat;
X
X    if (stat = submit(message, to)) {
X    errdisp(stat);                /* cannot queue message */
X    return (S_REDRAW);            /* say screen has changed */
X    } else {
X    return (unspool() | S_BREAK);        /* remove work and meta file */
X    }
X}
END_OF_main/email.c
if test 6160 -ne `wc -c <main/email.c`; then
    echo shar: \"main/email.c\" unpacked with wrong size!
fi
# end of overwriting check
fi
if test -f main/gmail.c -a "${1}" != "-c" ; then
  echo shar: Will not over-write existing file \"main/gmail.c\"
else
echo shar: Extracting \"main/gmail.c\" \(6153 characters\)
sed "s/^X//" >main/gmail.c <<'END_OF_main/gmail.c'
X/*++
X/* NAME
X/*      gmail 1
X/* SUMMARY
X/*      deliver unsent mail via gnuucp
X/* PROJECT
X/*      pc-mail
X/* PACKAGE
X/*      gnu
X/* SYNOPSIS
X/*      gmail [-d debuglevel]
X/* DESCRIPTION
X/*    This program replaces the sending function of the pc-mail "cico"
X/*    program, on systems that use GNUUCP for message transport.
X/*
X/*      gmail searches the pc-mail message data base for unsent mail
X/*    (with the "Out" status) and queues it for transmission via GNUUCP.
X/*    When a message has been queued it is renamed to reflect
X/*    the "Sent" status.
X/*
X/*    This program is intended to be called via the MAILCMD environment
X/*    variable, so that it is invoked upon exit from the mail user
X/*    interface program.
X/*
X/*      In order to avoid corruption of the message data base, control-c
X/*    interrupts are disabled while this program executes.
X/* ENVIRONMENT
X/*    MAILDIR, path to pc-mail message data base
X/* COMMANDS
X/*    rmail, the gnuucp mailer
X/* FILES
X/*      In the spool directory:
X/*    d<seqno>    unsent mail, message body
X/*    x<seqno>    unsent mail, destination and subject
X/*    q<seqno>    sent mail, message body
X/*    r<seqno>    sent mail, destination and subject
X/* SEE ALSO
X/*      path(5)         spool directory, file name formats
X/* DIAGNOSTICS
X/*      Problems are reported on the standard error output, and cause the
X/*    program to terminate with a nonzero exit status.
X/* BUGS
X/*    It is left up to GNUUCP to determine what to do with undeliverable mail.
X/* AUTHOR(S)
X/*      W.Z. Venema
X/*      Eindhoven University of Technology
X/*      Department of Mathematics and Computer Science
X/*      Den Dolech 2, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
X/* CREATION DATE
X/*    Wed Jan  3 22:16:28 MET 1990
X/* LAST MODIFICATION
X/*    90/01/22 13:01:40
X/* VERSION/RELEASE
X/*    2.1
X/*--*/
X
X#include <stdio.h>
X#include <signal.h>
X#include <time.h>
X#include <varargs.h>
X
X#include "defs.h"
X#include "ndir.h"
X#include "path.h"
X
X#ifndef    RMAIL
X#define    RMAIL    "rmail"
X#endif
X
X/* Forward declarations */
X
Xhidden char *get_dest();
Xhidden int uuqueue();
Xhidden void error();
Xhidden void frename();
Xhidden void parse_args();
Xhidden void scanmail();
Xhidden void usage();
X
X#define debug    if (dflag) (void) printf
X
Xhidden int dflag = 0;            /* debugging option */
X
Xpublic char *progname = "gmail";    /* for diagnostics */
X
X/* .. */
X
Xmain(argc, argv)
Xint     argc;
Xchar  **argv;
X{
X    (void) signal(SIGINT, SIG_IGN);        /* disable ctrl-c */
X    if (pathinit())                /* get path info */
X    error("no mail directory or MAILDIR environment variable not set");
X    parse_args(argc, argv);            /* parse command args */
X    scanmail();                    /* search for unsent mail */
X    exit(0);
X    /* NOTREACHED */
X}
X
X/* parse_args - process command-line arguments */
X
Xhidden void parse_args(argc, argv)
Xint     argc;
Xchar  **argv;
X{
X    while (--argc && *++argv && **argv == '-') {/* process options */
X    switch (*++*argv) {
X    case 'd':                /* turn debugging on */
X        dflag++;
X        break;
X    default:                /* unknown option */
X        usage("invalid option: -%c", **argv);
X        break;
X    }
X    }
X
X    /* check for extraneous arguments */
X
X    if (argc > 0)
X    usage("unexpected argument: %s", *argv);
X}
X
X/* scan for unsent mail */
X
Xhidden void scanmail()
X{
X    unsigned msgno;            /* message sequence number */
X    register DIR *dp;
X    struct direct *de;
X    char   *dest;
X
X    debug("directory: \"%s\"\n", maildir);
X
X    /*
X     * Scan the spool directory for unsent mail. After the message has been
X     * piped through rmail, rename it to reflect the "Sent" status. Do not give
X     * up if a file cannot be opened; just proceed with the next message.
X     */
X
X    if ((dp = opendir(maildir)) == 0)
X    error("cannot read the mail directory: %s", maildir);
X
X    while (de = readdir(dp)) {
X    debug("file: \"%s\"\n", de->d_name);
X    if (de->d_name[0] == OUT_META && (msgno = seqno(de->d_name))
X    && (dest = get_dest(msgno)) && uuqueue(msgno, dest)) {
X        frename(out_mesg(msgno), sent_mesg(msgno));
X        frename(out_meta(msgno), sent_meta(msgno));
X    }
X    }
X    closedir(dp);
X}
X
X/* uuqueue - queue one message */
X
Xhidden int uuqueue(msgno, dest)
Xunsigned msgno;
Xchar   *dest;
X{
X    char    cmd[BUFSIZ];
X    char   *path;
X    char   *rcpt;
X    static char sep[] = " \t\r\n";
X
X    if (access(path = out_mesg(msgno), 04)) {
X    debug("%s: cannot read message file: %s\n", path, sys_errlist[errno]);
X    return (0);
X    } else {
X
X    /*
X     * The GNUUCP rmail program has to invoked for each recipient. rmail
X     * will have to deal with undeliverable mail anyway, so we ignore
X     * that class of errors.
X     */
X
X    for (rcpt = strtok(dest, sep); rcpt; rcpt = strtok((char *) 0, sep)) {
X        (void) sprintf(cmd, "%s %s <%s", RMAIL, rcpt, path);
X        debug("command: %s\n", cmd);
X        if (system(cmd) == 127)
X        error("could not invoke the shell");
X    }
X    return (1);
X    }
X}
X
X/* get_dest - extract recipients */
X
Xhidden char *get_dest(msgno)
Xunsigned msgno;
X{
X    static char buf[MAXLINE];
X    FILE   *fp;
X    char   *ret;
X    char   *path;
X
X    if ((fp = fopen(path = out_meta(msgno), "r")) == 0) {
X    debug("%s: cannot open: %s\n", path, sys_errlist[errno]);
X    return (0);
X    } else {
X    if ((ret = fgets(buf, sizeof(buf), fp)) == 0)
X        debug("%s: no recipients found\n", path);
X    (void) fclose(fp);
X    return (ret);
X    }
X}
X
X/* frename - forcibly change the name of a file */
X
Xhidden void frename(from, to)
Xchar   *from;
Xchar   *to;
X{
X    debug("rename: %s -> %s\n", from, to);
X
X    if (chmod(to, 0600) == 0)
X    (void) unlink(to);
X    if (rename(from, to))
X    error("cannot rename %s to %s: %s", from, to, sys_errlist[errno]);
X}
X
X/* error - complain */
X
X/* VARARGS */
X
Xhidden void error(va_alist)
Xva_dcl
X{
X    va_list ap;
X    char   *fmt;
X
X    (void) fprintf(stderr, "%s: ", progname);
X    va_start(ap);
X    fmt = va_arg(ap, char *);
X    (void) vfprintf(stderr, fmt, ap);
X    va_end(ap);
X    (void) putc('\n', stderr);
X    exit(2);
X}
X
X/* usage - explain what is wrong */
X
X/* VARARGS */
X
Xhidden void usage(va_alist)
Xva_dcl
X{
X    va_list ap;
X    char   *fmt;
X
X    (void) fprintf(stderr, "%s: ", progname);
X    va_start(ap);
X    fmt = va_arg(ap, char *);
X    (void) vfprintf(stderr, fmt, ap);
X    va_end(ap);
X    (void) fprintf(stderr, "\nusage: gmail [-d]\n");
X    exit(2);
X}
END_OF_main/gmail.c
if test 6153 -ne `wc -c <main/gmail.c`; then
    echo shar: \"main/gmail.c\" unpacked with wrong size!
fi
# end of overwriting check
fi
if test -f main/gphys.c -a "${1}" != "-c" ; then
  echo shar: Will not over-write existing file \"main/gphys.c\"
else
echo shar: Extracting \"main/gphys.c\" \(6844 characters\)
sed "s/^X//" >main/gphys.c <<'END_OF_main/gphys.c'
X/*++
X/* NAME
X/*    gphys 3
X/* SUMMARY
X/*    g protocol packet input/output
X/* PROJECT
X/*    pc-mail
X/* PACKAGE
X/*    cico
X/* SYNOPSIS
X/*    #include "gp.h"
X/*
X/*    void gsctrl(fd,c)
X/*    int fd,c;
X/*
X/*    void gsdata(fd,pk,c)
X/*    int fd,c;
X/*    Packet *pk;
X/*
X/*    int grpack(fd,pk)
X/*    int fd;
X/*    Packet *pk;
X/* DESCRIPTION
X/*    The functions in this module send and receive packets. Interfacing
X/*    is based on Packet structures. Messages are interpreted elsewhere.
X/*
X/*    gsctrl() sends a control packet to the remote receiver (no data
X/*    segment).
X/*
X/*    gsdata() sends a data packet to the remote receiver.
X/*    The Packet structure is completed with a 16-bit checksum.
X/*    This function expects read/write sequence information in
X/*    the c parameter.
X/*
X/*    grpack() receives a packet from the remote transmitter and checks
X/*    its integrity. It fills in the k, c, len and check fields of the
X/*    Packet structure and returns the type of message (DATA, SHORT,
X/*    CLOSE, RJ, RR, etcetera).
X/* DIAGNOSTICS
X/*    grpack() returns FAIL if a corrupted packet was received, and
X/*    TIME if no packet was received within the time-out interval.
X/* BUGS
X/*    No data re-reading in case of transmission errors.
X/*    Some parts of the code rely on 8-bit bytes, 16-bit short integers.
X/* AUTHOR(S)
X/*    W.Z. Venema
X/*    Eindhoven University of Technology
X/*    Department of Mathematics and Computer Science
X/*    Den Dolech 2, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
X/* CREATION DATE
X/*    Sun Apr 19 11:39:27 GMT+1:00 1987
X/* LAST MODIFICATION
X/*    90/01/22 13:01:42
X/* VERSION/RELEASE
X/*    2.1
X/*--*/
X
X#include <signal.h>
X#include <setjmp.h>
X#include "gp.h"
X
X/* local and forward declarations */
X
Xstatic jmp_buf timebuf;
Xstatic int chksum(),readhead(),readdata(),clkint();
X
X#define    READ(fd,cp,n)    { if (read(fd,cp,n) != n) clkint(); }
X
X/*
X* "A six byte framing envelope is constructed using the control"
X* "byte C of a packet and five other bytes as depicted below."
X*        <DLE><k><c0><c1><C><x>
X* "The <DLE> symbol denotes the ASCII ctrl/P character. If the"
X* "envelope is to be followed by a data segment, <k> has the"
X* "value log2(size)-4; i.e. 1 <= k < 8. If k is 9, then the"
X* "envelope represents a control packet. The <c0> and <c1>"
X* "bytes are the low-order and high-order bytes respectively of"
X* "0xAAA minus a 16-bit checksum. For control packets, this"
X* "16-bit checksum is the same as the control byte C. For data"
X* "packets, the checksum is calculated by the program below."
X* "The <x> byte is the exclusive-or of <k><c0><c1><C>. Error"
X* "control is accomplished by checking a received framing"
X* "envelope for compliance with the definition, and comparing a"
X* "checksum function of the data segment with <c0><c1>."
X*/
X
X/* gsctrl - send control packet (no data segment) */
X
Xvoid gsctrl(fd,c)
Xint fd,c;
X{
X    char header[6];
X    register char chkhdr;
X    register char *cp = header;
X    int cksm = MAGIC-c;                /* do checksum */
X
X    *cp++ = CTRL('P');                /* start of header */
X    chkhdr  = *cp++ = KCTRL;            /* k byte (control) */
X    chkhdr ^= *cp++ = cksm;            /* c0 byte (checksum lsb) */
X    chkhdr ^= *cp++ = cksm>>8;            /* c1 byte (checksum msb) */
X    chkhdr ^= *cp++ = c;            /* message|sequence info */
X    *cp = chkhdr;                /* header checksum */
X
X    write(fd,header,sizeof(header));        /* send header */
X    DEBUG(9,"xmt: %o\n",c&0377);        /* show header */
X}
X
X/* gsdata - send data packet */
X
Xvoid gsdata(fd,pk,c)
Xint fd,c;
Xregister Packet *pk;
X{
X    char header[6];
X    register char chkhdr;
X    register char *cp = header;
X    int cval = pk->c|(c&077);            /* fold in sequence info */
X
X    pk->chk = MAGIC-(chksum(pk->data,pk->len)^(0377&cval));
X
X    *cp++ = CTRL('P');                /* start of header */
X    chkhdr  = *cp++ = pk->k;            /* k byte (message length) */
X    chkhdr ^= *cp++ = pk->chk;            /* c0 byte (checksum lsb) */
X    chkhdr ^= *cp++ = pk->chk>>8;        /* c1 byte (checksum msb) */
X    chkhdr ^= *cp++ = cval;            /* data|sequence info */
X    *cp = chkhdr;                /* header checksum */
X
X    write(fd,header,sizeof(header));        /* send header */
X    DEBUG(9,"xmt: %o\n",cval&0377);        /* show header */
X
X    write(fd,pk->data,pk->len);            /* send data segment */
X    DEBUG(9,"xmt: data %d bytes\n",pk->segl);    /* show data */
X}
X
X/* grpack - receive one data or control packet; return packet type info */
X
Xint grpack(fd,pk)
Xint fd;
Xregister Packet *pk;
X{
X    if (setjmp(timebuf))            /* in case we time out */
X    return(TIME);                /* it just happened */
X    signal(SIGALRM,clkint);            /* alarm clock response */
X    alarm(ALARM);                /* set alarm clock */
X
X    if (readhead(fd,pk)) {            /* read packet header */
X    DEBUG(7,"rcv: bad header\n","");
X    alarm(0);                /* turn timer off */
X    return(FAIL);                /* header checksum error */
X    } else if (pk->k == KCTRL) {
X    alarm(0);                /* turn timer off */
X    return(MESG(pk->c));            /* CLOSE | RJ | RR etcetera */
X    } else if (readdata(fd,pk)) {
X    DEBUG(7,"rcv: bad data\n","");
X    alarm(0);                /* turn timer off */
X    return(FAIL);                /* data checksum error */
X    } else {
X    alarm(0);                /* turn timer off */
X    return(TYPE(pk->c));            /* DATA | SHORT */
X    }
X}
X
X/* readhead - read header and check header checksum */
X
Xstatic int readhead(fd,pk)
Xint fd;
Xregister Packet *pk;
X{
X    char header[5];
X    int ok;
X    register char chkhdr;
X    register char *cp = header;
X
X    do {                    /* start reading */
X    READ(fd,cp,1);                /* skip all garbage */
X    } while (*cp != CTRL('P'));            /* up to packet header */
X
X    READ(fd,header,sizeof(header));        /* read packet header */
X
X    chkhdr  = pk->k = *cp++;            /* data length or control */
X    chkhdr ^= pk->chk = *cp++&0377;        /* data checksum lsb */
X    chkhdr ^= *cp;
X    pk->chk |= (*cp++&0377)<<8;    /* data checksum msb */
X    chkhdr ^= pk->c = *cp++;            /* control packet or data */
X    if (ok = (chkhdr == *cp))
X    DEBUG(9,"rcv: %o\n",pk->c&0377);
X    return(!ok);                /* check the checksum */
X}
X
X/* readdata - read data segment and check data checksum */
X
Xstatic int readdata(fd,pk)
Xint fd;
Xregister Packet *pk;
X{
X    if (seglen[pk->k] > pk->len) {
X    DEBUG(7,"rcv: data %d bytes too big\n",seglen[pk->k]);
X    return(1);
X    } else {
X    register int i;
X    DEBUG(9,"rcv: data %d bytes\n",pk->len = seglen[pk->k]);
X    for (i = 0; i < pk->len; i++) {
X        READ(fd,&pk->data[i],1);
X    }
X    return(pk->chk+(chksum(pk->data,pk->len)^(pk->c&0377)) != MAGIC);
X    }
X}
X
X/* clkint - tiny time-out routine */
X
Xstatic int clkint()
X{
X    DEBUG(9,"rcv: timed out\n","");
X    longjmp(timebuf,1);
X    /* NOTREACHED */
X}
X
X/* chksum - unix packet driver checksum algorithm */
X
Xstatic int chksum(s,n)
Xregister char *s;
Xregister n;
X{
X    register short sum;
X    register unsigned short t;
X    register short x;
X
X    sum = -1;
X    x = 0;
X    do {
X    if (sum < 0) {
X        sum <<= 1;
X        sum++;
X    } else
X        sum <<= 1;
X    t = sum;
X    sum += (unsigned)*s++ & 0377;
X    x += sum ^ n;
X    if ((unsigned short)sum <= t) {
X        sum ^= x;
X    }
X    } while (--n > 0);
X
X    return(sum);
X}
END_OF_main/gphys.c
if test 6844 -ne `wc -c <main/gphys.c`; then
    echo shar: \"main/gphys.c\" unpacked with wrong size!
fi
# end of overwriting check
fi
if test -f main/gpres.c -a "${1}" != "-c" ; then
  echo shar: Will not over-write existing file \"main/gpres.c\"
else
echo shar: Extracting \"main/gpres.c\" \(6380 characters\)
sed "s/^X//" >main/gpres.c <<'END_OF_main/gpres.c'
X/*++
X/* NAME
X/*    gpres.c 3
X/* SUMMARY
X/*    g-protocol general interface
X/* PROJECT
X/*    pc-mail
X/* PACKAGE
X/*    cico
X/* SYNOPSIS
X/*    int gopen(fd);
X/*    int fd;
X/*
X/*    int gwrite(fd,buf,len)
X/*    int fd,len;
X/*    char *buf;
X/*
X/*    int gread(fd,buf,len)
X/*    int fd,len;
X/*    char *buf;
X/*
X/*    int gclose(fd)
X/*    int fd;
X/* DESCRIPTION
X/*    The functions in this module present an interface that closely
X/*    resembles the unix kernel i/o interface.
X/*
X/*    gopen() handles the initial message exchange. fd should be
X/*    connected to a tty line. gopen() normally returns a zero value.
X/*
X/*    gwrite() returns the number of bytes `written' to the remote system.
X/*    It should be considered an error if this is not equal to the number
X/*    of bytes requested.
X/*    A zero-length write should be used to indicate EOF during file transfer.
X/*
X/*    gread() returns the requested number of bytes or the number of
X/*    bytes sent by the remote system, whichever is smaller.
X/*    A zero-length read indicates EOF during file transfer.
X/*
X/*    gclose() shuts the protocol down, but does not otherwise change
X/*    communications line parameters. It normally returns a zero value.
X/* FUNCTIONS AND MACROS
X/*    galloc(), gfree(), gsproto(), grproto()
X/* DIAGNOSTICS
X/*    All functions return -1 in case of unrecoverable problems.
X/* BUGS
X/*    All g protocol routines assume that the XON/XOFF flow control
X/*    has been turned off.
X/*    Some parts of the code rely on 8-bit bytes, 16-bit short integers.
X/* AUTHOR(S)
X/*    W.Z. Venema
X/*    Eindhoven University of Technology
X/*    Department of Mathematics and Computer Science
X/*    Den Dolech 2, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
X/* CREATION DATE
X/*    Sun Apr 19 12:41:37 GMT+1:00 1987
X/* LAST MODIFICATION
X/*    90/01/22 13:01:43
X/* VERSION/RELEASE
X/*    2.1
X/*--*/
X
X#include <setjmp.h>
X#include "gp.h"
X
X/* local and forward declarations */
X
Xstatic jmp_buf failbuf;
Xstatic void gpeek(),gpoke(),memcpy();
X
X/* gfail - exception handling */
X
Xvoid gfail()
X{
X    longjmp(failbuf,1);
X}
X
X/* gopen - not quite an analogon of unix open(2) */
X
Xint gopen(fd)
Xint fd;
X{
X    return(ginit(fd));        /* do packet stuff elsewhere */
X}
X
X/* gwrite - g-protocol analogon of unix write(2) */
X
Xgwrite(fd,data,len)
Xint fd,len;
Xchar *data;
X{
X    /* set up exception handling */
X
X    if (setjmp(failbuf))            /* in case gsproto fails */
X    return(FAIL);                /* it just did */
X
X    /* handle special case of zero-length writes separately */
X
X    if (len <= 0) {                /* end-of-file message */
X    register Packet *pk = galloc();        /* allocate output packet */
X    gpoke(pk,data,len);            /* make null-data packet */
X    gsproto(fd,pk);                /* send to other side */
X    } else {                    /* true data message */
X    register int shot;            /* quantum size */
X    register int rest;            /* amount left to do */
X    for (rest = len; rest > 0; rest -= shot,data += shot) {
X        register Packet *pk = galloc();    /* allocate output packet */
X        gpoke(pk,data,shot = MIN(pk->len,rest));/* fill the packet */
X        gsproto(fd,pk);
X    }
X    }
X    return(len);                /* no problems detected */
X}
X
X/* gread - g-protocol analogon of unix read(2) */
X
Xgread(fd,data,len)
Xint fd,len;
Xchar *data;
X{
X    static Packet *pk;                /* our byte stock */
X    register int igot;                /* our return value */
X
X    /* set up exception handling */
X
X    if (setjmp(failbuf))            /* in case grproto fails */
X    return(FAIL);                /* it just did */
X
X    /* if no bytes in stock, get some fresh ones and see how much we got */
X
X    if (pk == 0 || pk->segl <= 0)        /* we are out of data */
X    gpeek(pk = grproto(fd));        /* get fresh packet */
X
X    /* return as many bytes as asked, or as in stock, whichever is less */
X
X    if ((igot = MIN(len,pk->segl)) > 0) {
X    memcpy(data,pk->segp,igot);        /* copy to caller's buffer */
X    pk->segp += igot;            /* update stock pointer */
X    pk->segl -= igot;            /* update stock count */
X    }
X    if (pk->segl <= 0)                /* if we exhausted the stock */
X    gfree(pk);                /* release packet */
X    return(igot);                /* no problems detected */
X}
X
X/* gclose - turn g protocol off */
X
Xgclose(fd)
Xint fd;
X{
X    return(gfinit(fd));                /* not here! */
X}
X
X/*
X* "Each transmitter is constrained to observe the maximum data segment"
X* "size established during initial synchronization by the receiver that"
X* "it sends to. (...) `short' packets have zero or more data bytes but less"
X* "than the maximum. The first one or two bytes of the data segment of"
X* "a short packet are `count' bytes that indicate the difference between"
X* "the maximum size and the number of bytes in the short segment. If the"
X* "difference is less than 127, one count byte is used. If the difference"
X* "exceeds 127, then the low-order seven bits of the difference are put"
X* "in the first data byte and the remaining high-order bit is set as an"
X* "indication that the remaining bits of the difference are in the second"
X* "byte.
X*/
X
X/* gpoke - prepare packet for transmission */
X
Xstatic void gpoke(pk,data,len)
Xregister Packet *pk;
Xint len;
Xchar *data;
X{
X    register int diff = pk->len-len;        /* packet/data size mismatch */
X
X    pk->segp = pk->data;            /* set up write pointer */
X    pk->segl = len;                /* actual segment length */
X    if (diff < 0 || len < 0) {
X    DEBUG(7,"gpoke: trouble\n","");        /* something very wrong */
X    gfail();
X    /* NOTREACHED */
X    } else if (diff == 0) {
X    pk->c = DATA;                /* long data segment */
X    } else if (diff <= 127) {
X    pk->c = SHORT;                /* short data segment */
X    *pk->segp++ = diff;            /* one difference byte */
X    } else if (diff > 127) {
X    pk->c = SHORT;                /* tiny data segment */
X    *pk->segp++ = diff|0200;        /* two difference bytes */
X    *pk->segp++ = diff>>7;
X    }
X    memcpy(pk->segp,data,pk->segl);        /* copy data into packet */
X}
X
X/* gpeek - prepare newly packet for reading */
X
Xstatic void gpeek(pk)
Xregister Packet *pk;
X{
X    register int diff;
X
X    pk->segp = pk->data;            /* set up read pointer */
X    if (TYPE(pk->c) == DATA) {
X    diff = 0;                /* long data segment */
X    } else if (TYPE(pk->c) != SHORT) {
X    DEBUG(7,"gread: trouble\n","");        /* something funny */
X    gfail();
X    /* NOTREACHED */
X    } else if ((diff = *pk->segp++&0377)&0200) {/* short data segment */
X    diff = (diff&0177)|((*pk->segp++&0377)<<7);
X    }
X    pk->segl = pk->len-diff;            /* actual segment size */
X    DEBUG(9,"rcv: data %d bytes\n",pk->segl);
X}
X
X/* memcpy - not-so-efficient implementation */
X
Xstatic void memcpy(dst,src,len)
Xregister char *dst,*src;
Xregister int len;
X{
X    while (len-- > 0)
X    *dst++ = *src++;
X}
END_OF_main/gpres.c
if test 6380 -ne `wc -c <main/gpres.c`; then
    echo shar: \"main/gpres.c\" unpacked with wrong size!
fi
# end of overwriting check
fi
if test -f main/mbox.c -a "${1}" != "-c" ; then
  echo shar: Will not over-write existing file \"main/mbox.c\"
else
echo shar: Extracting \"main/mbox.c\" \(6112 characters\)
sed "s/^X//" >main/mbox.c <<'END_OF_main/mbox.c'
X/*++
X/* NAME
X/*      mbox 3
X/* SUMMARY
X/*      display and manipulate one non-work message
X/* PROJECT
X/*      pc-mail
X/* PACKAGE
X/*      mail
X/* SYNOPSIS
X/*      int mbox(meta,msgid)
X/*    int meta;
X/*    unsigned msgid;
X/* DESCRIPTION
X/*      mbox() is invoked when the user has selected a non-work mail message.
X/*    It instructs the pager to display the selected mail message.
X/*      The user has the usual options for manipulating the message
X/*    being displayed.
X/*
X/*    The meta parameter indicates the message type,
X/*    and msgid is the numerical message id. If the message file is being
X/*    read for the first time (meta == NEW_META), it will be marked as read
X/*    by renaming the meta file.
X/*
X/*    Message header lines can be suppressed selectively (see setup).
X/* FILES
X/*      $MAILDIR/?nnnnn, message and meta files
X/* SEE ALSO
X/*      pager(3), pager(5), kbdinp(3)
X/* DIAGNOSTICS
X/*      If a selected mail message could not be found an error message
X/*      is displayed instead.
X/* AUTHOR(S)
X/*      W.Z. Venema
X/*      Eindhoven University of Technology
X/*      Department of Mathematics and Computer Science
X/*      Den Dolech 2, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
X/* CREATION DATE
X/*      Sun Apr  5 13:01:12 GMT+1:00 1987
X/* LAST MODIFICATION
X/*    90/01/22 13:02:11
X/* VERSION/RELEASE
X/*    2.1
X/*--*/
X
X#include <stdio.h>
X#include <ctype.h>
X
X#include "defs.h"
X#include "path.h"
X#include "pager.h"
X#include "screen.h"
X#include "mail.h"
X#include "ascf.h"
X#include "params.h"
X#include "ms_parse.h"
X
X /*
X  * Storage for header lines to be ignored. Both the strings with header
X  * names, and the pointers to these strings, are kept together.
X  */
X
Xstruct ignore {
X    char    strs[BUFSIZ];        /* null-terminated strings */
X    char   *ptrs[BUFSIZ / 2];        /* null-terminated list of pointers */
X};
X
Xhidden void ign_init();            /* forward declarations */
Xhidden int ign_header();
Xhidden int mbox_filter();
X
Xhidden File *letter = 0;        /* pager file */
X
X/* show_letter - display selected mail message */
X
Xhidden int show_letter()
X{
X    set_pager(letter);                /* select message display */
X    ds_pager();                    /* put it on the screen */
X    return (0);                    /* say screen is ok */
X}
X
X/* mbox - user has selected a message file */
X
Xpublic int mbox(meta, id)
Xint     meta;
Xunsigned id;
X{
X    static Screen screen[] = {
X    'C',    "Close",0,        initscreen,
X    'D',    "Delete",delete,    delcurr,
X    'M',    "Mail",    mailfile,    "Mail a copy of this message",
X    'P',    "Print",print,        printcurr,
X    'R',    "Reply",reply,        "Create reply to sender",
X    'S',    "Save",    save,        "Save this message to ordinary file",
X    'W',    "Work",    makework,    "Save this message to work file",
X    '|',    "|",    filter,        "Filter this message through command",
X    PGUP,    PgUp,    pu_pager,    pageup,
X    PGDN,    PgDn,    pd_pager,    pagedn,
X    UP,    "Up",    up_pager,    csrup,
X    DOWN,    "Down",    dn_pager,    csrdn,
X    0,    0,    show_letter,    "(Reading a mail message)",
X    };
X    char   *seen;
X
X    /*
X     * Mail being read for the first time is renamed to reflect the
X     * status change.
X     */
X
X    if (mbox_filter(letter = open_pager(), message)) {
X    mesg_pager(letter, m_msgread);        /* no file or read error */
X    } else if (meta != NEW_META) {        /* unread message? */
X     /* void */ ;                /* no */
X    } else if (rename(comment, seen = old_meta(id)) == 0) {
X    strcpy(comment, seen);            /* mark message as read */
X    junk_desk();                /* say desk-top outdated */
X    }
X    kbdinp(screen);                /* look at the screen */
X    close_pager(letter), letter = 0;        /* destroy the display */
X    return (S_REDRAW);                /* force screen redrawing */
X}
X
X/* mbox_filter - suppress some message-header lines */
X
Xhidden int mbox_filter(pp, path)
XFile   *pp;
Xchar   *path;
X{
X#if (defined(lint) && defined(iAPX286))
X    static
X#endif
X    struct ignore ignore;
X    FILE   *fp;
X
X    if ((fp = ascopen(path, "r")) == 0) {
X    return (1);
X    } else {
X    char    buf[BUFSIZ];
X    int     ig_flag = 0;
X    int     ret;
X    int     context = MS_UUCP;
X
X    ign_init(&ignore);            /* initialize filter */
X
X    /*
X     * The header-line suppression algorithm is effective for RFC822-like
X     * headers lines only. Its main use is to get rid of the "Received:"
X     * lines that frequently show up in non-local mail.
X     */
X
X    while (ascgets(buf, sizeof(buf), fp)) {
X        switch (context = ms_parse(context, buf)) {
X        case MS_UUCP:
X        app_pager(pp, buf);
X        break;
X        case MS_HEADER:
X        if ((ig_flag = (ign_header(buf, &ignore))) == 0)
X            app_pager(pp, buf);
X        break;
X        case MS_CONT:
X        if (ig_flag == 0)
X            app_pager(pp, buf);
X        break;
X        case MS_BODY:
X        app_pager(pp, buf);
X        break;
X        }
X    }
X    ret = ferror(fp);
X    ascclose(fp);
X    return (ret);
X    }
X}
X
X/* ign_init - setup header lines to be ignored */
X
Xhidden void ign_init(ig)
Xstruct ignore *ig;
X{
X    Info   *ip = getparams() + P_IGNORE;/* what to ignore */
X    char   *sp = ":, ";            /* string separators */
X    char  **lp = ig->ptrs;        /* separated strings */
X
X    /*
X     * This function takes, from the pc-mail setup file, a (blank or
X     * comma)-separated list with names of mail headers to be ignored when a
X     * message is displayed. The list of names is broken up into separate
X     * strings. The result, a null-terminated list of string pointers, is
X     * stored in the ig argument. We use strtok() for string splitting. Since
X     * that function destroys its input, and since the user may change the
X     * setup at any time, we keep in the ig argument a copy of the relevant
X     * setup information.
X     */
X
X    if (ip->strval == 0) {            /* nothing to ignore */
X    *lp = 0;
X    } else {                    /* copy, then split */
X    (void) strncpy(ig->strs, ip->strval, sizeof(ig->strs));
X    for (*lp = strtok(ig->strs, sp); *lp; *lp = strtok((char *) 0, sp))
X        lp++;
X    }
X}
X
X/* ign_header - do we ignore this header line */
X
Xhidden int ign_header(buf, ig)
Xregister char *buf;
Xstruct ignore *ig;
X{
X    register int l;            /* header name length */
X    register char **list;        /* ptr to ignored header names */
X
X    /* Make sure that the header name is followed by a colon */
X
X    for (list = ig->ptrs; *list; list++) {
X    if (buf[l = strlen(*list)] == ':' && istrncmp(buf, *list, l) == 0)
X        return (1);
X    }
X    return (0);
X}
END_OF_main/mbox.c
if test 6112 -ne `wc -c <main/mbox.c`; then
    echo shar: \"main/mbox.c\" unpacked with wrong size!
fi
# end of overwriting check
fi
if test -f main/nmail.c -a "${1}" != "-c" ; then
  echo shar: Will not over-write existing file \"main/nmail.c\"
else
echo shar: Extracting \"main/nmail.c\" \(6579 characters\)
sed "s/^X//" >main/nmail.c <<'END_OF_main/nmail.c'
X/*++
X/* NAME
X/*      nmail
X/* SUMMARY
X/*      extract originator and subject from new mail received by cico
X/* PROJECT
X/*      pc-mail
X/* PACKAGE
X/*      nmail
X/* SYNOPSIS
X/*      nmail [-d debuglevel]
X/* DESCRIPTION
X/*      nmail searches for new mail files received by cico and extracts
X/*    the originator's name, and message subject for later use by the
X/*    mail visual shell.
X/*
X/*     Return address formats we understand (in order of preference):
X/* .nf
X/*
X/*    From: address (full_name)    (take full_name)
X/*    From: full_name <address>    (take full_name)
X/*    From: address            (take address)
X/*    >From address            (take address)
X/*    From address            (take address)
X/*
X/* .fi
X/*      To avoid tampering, new files will have read-only permission.
X/*
X/*      In order to avoid corruption, control-c interrupts are disabled
X/*    while this program executes.
X/* FILES
X/*      In the spool directory:
X/*    n<seqno>    received mail message
X/*    h<seqno>    extracted originator name, subject
X/* SEE ALSO
X/*      path(5)         spool directory, file names
X/*      cico(1)         network process
X/*      mail(1)       visual mail shell
X/* DIAGNOSTICS
X/*      Exit status zero when no errors were detected, nonzero in case of file
X/*      access errors. See status(5) for error codes.
X/* AUTHOR(S)
X/*      W.Z. Venema
X/*      Eindhoven University of Technology
X/*      Department of Mathematics and Computer Science
X/*      Den Dolech 2, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
X/* CREATION DATE
X/*      Tue Mar 31 20:14:11 GMT+1:00 1987
X/* LAST MODIFICATION
X/*    90/01/22 13:02:20
X/* VERSION/RELEASE
X/*    2.1
X/*--*/
X
X#include <stdio.h>
X#include <signal.h>
X#include <time.h>
X#include <ctype.h>
X#include <varargs.h>
X
X#include "defs.h"
X#include "ndir.h"
X#include "path.h"
X#include "status.h"
X#include "ms_parse.h"
X
Xextern struct tm *localtime();        /* system functions */
X
Xhidden void parse_args();        /* forward declarations */
Xhidden void newmail();
Xhidden void extract();
Xhidden void usage();
X
Xhidden int dflag = 0;            /* debugging option */
X
X#define debug    if (dflag) printf
X
Xpublic char *progname = "nmail";
X
Xmain(argc, argv)
Xint     argc;
Xchar  **argv;
X{
X    signal(SIGINT, SIG_IGN);            /* disable ctrl-c */
X    parse_args(argc, argv);            /* parse command args */
X    if (pathinit())                /* get path info */
X    exit(E_NOSPOOL);            /* bad MAILDIR variable */
X    umask(0222);                /* make files read-only */
X    newmail();                    /* get headers from new mail */
X    exit(0);
X    /* NOTREACHED */
X}
X
X/* parse_args - process command-line arguments */
X
Xhidden void parse_args(argc, argv)
Xint     argc;
Xchar  **argv;
X{
X    while (--argc && *++argv && **argv == '-') {/* process options */
X    switch (*++*argv) {
X    case 'd':                /* turn debugging on */
X        if (--argc == 0)
X        usage("missing debugging level argument");
X        if ((dflag = atoi(*++argv)) < 0 || dflag > 9)
X        dflag = 0;
X        break;
X    default:                /* unknown option */
X        usage("invalid option: -%c", **argv);
X        break;
X    }
X    }
X
X    /* check for extraneous arguments */
X
X    if (argc > 0)
X    usage("unexpected argument: %s", *argv);
X}
X
X/* scan for new mail that hasn't gotten yet a metafile */
X
Xhidden void newmail()
X{
X    register DIR *dp;
X    struct direct *de;
X    unsigned msgno;
X
X    debug("directory: \"%s\"\n", maildir);
X
X    /*
X     * Scan the spool directory for newly-arrived mail.
X     *
X     * Incoming mail message files have a name of "n<seqno>". The originator
X     * name is normally present in files with names "h<seqno>" or "o<seqno>".
X     * The presence of an "o" file implies that the file "n<seqno>" has been
X     * read by the user. An "h" file means that the user has not yet read the
X     * message file.
X     *
X     * If a message file has no corresponding "h" or "o" file we assume it is a
X     * new mail message and create an "h" file with the name of the
X     * originator and the subject of the message.
X     */
X
X    if ((dp = opendir(maildir)) == 0)
X    exit(E_NOSPOOL);
X
X    while (de = readdir(dp)) {
X    debug("nmail: file \"%s\"\n", de->d_name);
X    if (de->d_name[0] == NEW_MESG
X        && (msgno = seqno(de->d_name))) {
X        if (access(old_meta(msgno), 4) == 0) {
X         /* already marked as read */ ;
X        } else if (access(new_meta(msgno), 4) == 0) {
X         /* already marked as unread */ ;
X        } else {                /* create meta file */
X        extract(new_mesg(msgno), new_meta(msgno));
X        }
X    }
X    }
X    closedir(dp);
X}
X
X/* extract - extract originator and subject info from mail file to meta file */
X
Xhidden void extract(mail, meta)
Xchar   *mail;
Xchar   *meta;
X{
X    FILE   *mesgfp,
X           *metafp;
X    char    line[MAXLINE];
X    char    from[MAXLINE];            /* name of sender */
X    char    subj[MAXLINE];            /* message subject */
X    int     context = MS_UUCP;
X
X    debug("-- \"%s\" -> \"%s\"\n", mail, meta);
X
X    if ((mesgfp = fopen(mail, "r")) == NULL)    /* cannot open existing file */
X    exit(E_SYSFAIL);
X
X    strcpy(from, "Somewhere");            /* default originator */
X    subj[0] = '\0';                /* initialize subject */
X
X    /*
X     * Some mailers generate real headers, separated from the message body by
X     * an empty line. So we stop when we find an empty line. Other mailers
X     * have no headers, so we stop when we see no header line. The following
X     * algorithm tries to extract the real user name if possible, otherwise
X     * it takes whatever it can get.
X     */
X
X    while ((context != MS_BODY) && fgets(line, sizeof(line), mesgfp)) {
X    switch (context = ms_parse(context, line)) {
X    case MS_UUCP:
X        if (sscanf(line, "%*[>] From %s", from) != 1)
X        (void) sscanf(line, "From %s", from);
X        break;
X    case MS_HEADER:
X        if (hscanf(line, "Subject:", " %[^\n]", subj) == 0
X        && hscanf(line, "From:", " %*s ( %[^)] )", from) == 0)
X        (void) hscanf(line, "From:", " %[^<] <", from);
X        break;
X    }
X    }
X
X    /* carefully check all went well */
X
X    if (ferror(mesgfp))                /* sorry, read problem */
X    exit(E_READERR);
X    if ((metafp = fopen(meta, "w")) == NULL)    /* cannot create metafile */
X    exit(E_WRITERR);
X    fprintf(metafp, "%s\n%s\n", from, subj);    /* write originator, subject */
X    if (ferror(metafp)) {
X    (void) fclose(metafp);            /* ms-dog needs this! */
X    (void) chmod(meta, 0666);        /* sorry, write problem */
X    (void) unlink(meta);            /* delete metafile */
X    exit(E_WRITERR);
X    }
X    (void) fclose(mesgfp);
X    (void) fclose(metafp);
X}
X
X/* usage - explain what is wrong */
X
X/* VARARGS */
X
Xhidden void usage(va_alist)
Xva_dcl
X{
X    va_list ap;
X    char   *fmt;
X
X    va_start(ap);
X    fmt = va_arg(ap, char *);
X    vfprintf(stderr, fmt, ap);
X    va_end(ap);
X    fprintf(stderr, "\nusage: nmail [-d debugging_level]\n");
X    exit(2);
X}
END_OF_main/nmail.c
if test 6579 -ne `wc -c <main/nmail.c`; then
    echo shar: \"main/nmail.c\" unpacked with wrong size!
fi
# end of overwriting check
fi
if test -f main/startup.c -a "${1}" != "-c" ; then
  echo shar: Will not over-write existing file \"main/startup.c\"
else
echo shar: Extracting \"main/startup.c\" \(6115 characters\)
sed "s/^X//" >main/startup.c <<'END_OF_main/startup.c'
X/*++
X/* NAME
X/*      startup 3
X/* SUMMARY
X/*      startup/terminate network protocol
X/* PROJECT
X/*      pc-mail
X/* PACKAGE
X/*      cico
X/* SYNOPSIS
X/*      startproto()
X/*
X/*      endproto()
X/* DESCRIPTION
X/*      startproto() should be called after a successfull login on a remote
X/*      host. It performs the primary handshake with the other system
X/*      (call accepted/locked) and negotiates a communications protocol.
X/*      It then sets the function pointers Close/Read/Write to the
X/*      appropriate values. Until endproto() is called, all i/o to the
X/*      remote host should proceed through the functions pointed to by
X/*      Read/Write.
X/*
X/*      endproto() turns the protocol off, and sends the silly "OO" message
X/*      to the remote system. It does not disconnect, nor does it change
X/*      the state of the communications port.
X/* FUNCTIONS AND MACROS
X/*      xgetc(), xwrite(), trap()
X/* DIAGNOSTICS
X/*      The process of negotiation is shown when debugging is enabled.
X/*      startproto() and endproto() return 0 in case of success, E_LOST
X/*      if no response arrived and E_REJECT if the response differed
X/*      from the expected response.
X/* BUGS
X/*      startproto() assumes that the local system is the calling system.
X/* AUTHOR(S)
X/*      W.Z. Venema
X/*      Eindhoven University of Technology
X/*      Department of Mathematics and Computer Science
X/*      Den Dolech 2, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
X/* CREATION DATE
X/*      Fri Mar 27 13:43:00 GMT+1:00 1987
X/* LAST MODIFICATION
X/*    90/01/22 13:02:41
X/* VERSION/RELEASE
X/*    2.1
X/*--*/
X
X#include <stdio.h>
X#include <setjmp.h>
X
X#include "defs.h"
X#include "params.h"
X#include "comm.h"
X#include "logs.h"
X#include "status.h"
X#include "sysdep.h"
X
X/* forward declarations */
X
Xhidden char *xpct();            /* expect a string */
Xhidden char *send();            /* send a string */
X
X/* the functions that inplement the various protocols */
X
Xextern  kopen(), kclose(), kread(), kwrite();    /* k protocol */
Xextern  gopen(), gclose(), gread(), gwrite();    /* g protocol */
X
Xtypedef struct proto {
X    char    name;            /* name of the protocol */
X    int     (*open) ();            /* the open function */
X    int     (*close) ();        /* the close function */
X    int     (*read) ();            /* the read function */
X    int     (*write) ();        /* the write function */
X};
X
X/* the order of protocols is significant! */
X
Xhidden struct proto ptbl[] = {
X    'k', kopen, kclose, kread, kwrite,    /* try this first */
X    'g', gopen, gclose, gread, gwrite,    /* then this one */
X    /* add your protocols at the appropriate place */
X    0,                    /* terminator! */
X};
X
X/* startproto - do primary handshake, establish protocol and turn it on */
X
Xpublic  startproto()
X{
X    int    *savetrap = systrap;
X    jmp_buf mytrap;
X    register struct proto *pp;
X    register char *cp;
X    int     status;
X
X    if (status = setjmp(systrap = mytrap)) {    /* get here if expect fails */
X    systrap = savetrap;
X    return (status);
X    }
X    /* the primary handshake: who are we and is it ok we call right now */
X
X    sscanf(xpct("Shere"), "Shere=%s", rmthost);    /* try to get host name */
X    log("SUCCEEDED (call to %s)", rmthost);
X
X    /* some uucico implementations seem to have problems with debug level 0 */
X
X    send(strcons("S%s -x%d", LOGIN_NAME, MAX(dflag, 1)));
X    xpct("ROK");                /* we're accepted or rejected */
X
X    /* choose a protocol from the list offered by the other side */
X
X    for (cp = xpct("P") + 1, pp = ptbl; pp->name && !index(cp, pp->name); pp++)
X     /* void */ ;
X    if (pp->name == 0) {            /* no common protocol */
X    send("UN");
X    trap(E_REJECT, "FAILED (no common protocol in \"%s\")", cp);
X    /* NOTREACHED */
X    }
X    send(strcons("U%c", pp->name));        /* my choice of protocol */
X
X    /* install protocol */
X
X    Close = pp->close;                /* for endproto() */
X    Read = pp->read;
X    Write = pp->write;
X    if (pp->open && CALL(pp->open) (ttfd))    /* start up a protocol */
X    trap(E_LOST, "FAILED (startup)");
X
X    /* finish up */
X
X    log("OK (startup)");
X    systrap = savetrap;                /* get here if expect wins */
X    return (0);
X}
X
X/* endproto - terminate protocol */
X
Xpublic  endproto()
X{
X    int    *savetrap = systrap;            /* save exception handler */
X    jmp_buf mytrap;
X    int     status;
X
X    if (Close)                    /* check there is one */
X    CALL(Close) (ttfd);            /* turn protocol off */
X    send("OOOOOO");                /* byebye */
X
X    /* Don\'t wait for the other side\'s OOOOOO, just sleep and quit. */
X
X    (void) sleep(1);
X    log("OK (conversation complete)");
X    return (0);
X}
X
X/* send - write message to remote host and return pointer to message */
X
Xhidden char *send(str)
Xchar   *str;
X{
X    xwrite(ttfd, "\020", 1);            /* message header */
X    xwrite(ttfd, str, strlen(str) + 1);        /* include trailing null */
X    debug(4) ("send: %S\n", str);
X    return (str);                /* return the message */
X}
X
X/* xpct - read message from host in "^Pmessage[\0\n]" format; trap on errors */
X
Xhidden char *xpct(pat)
Xchar   *pat;
X{
X    register int c;
X    register char *p = msgin;
X    register int inmsg = 0;
X
X    /*
X     * Keep reading until we time out, or until a complete message has been
X     * received. Consider the link as lost in case of time out. Assume we are
X     * rejected if the received message differs from what was expected.
X     */
X
X    debug(4) ("xpct: %S\n", pat);
X
X    for (;;) {
X    if ((c = xgetc()) == EOF) {
X        trap(E_LOST, "FAILED (protocol handshake)");
X        /* NOTREACHED */
X    } else if ((c &= 0177) == '\020') {
X        debug(4) (" got sync\n");        /* got start of message */
X        p = msgin;                /* reset */
X        inmsg = 1;
X    } else if (inmsg == 0) {
X        debug(4) ("%C", c);            /* don\'t store, just debug */
X    } else if (*p++ = ((c == '\n') ? '\0' : c)) {
X        debug(4) ("%C", c);            /* store and debug */
X        if (p >= msgin + MSGBUF) {        /* spurious Ctrl-P seen? */
X        p = msgin;            /* reset */
X        inmsg = 0;            /* reset */
X        }
X    } else if ((debug(4) ("\n")), strncmp(pat, msgin, strlen(pat)) == 0) {
X        return (msgin);            /* expect succeeded */
X    } else {
X        msgin[30] = '\0';            /* truncate to 30 */
X        trap(E_REJECT, "FAILED (%S)", msgin);
X        /* NOTREACHED */
X    }
X    }
X}
END_OF_main/startup.c
if test 6115 -ne `wc -c <main/startup.c`; then
    echo shar: \"main/startup.c\" unpacked with wrong size!
fi
# end of overwriting check
fi
if test -f main/str.c -a "${1}" != "-c" ; then
  echo shar: Will not over-write existing file \"main/str.c\"
else
echo shar: Extracting \"main/str.c\" \(6415 characters\)
sed "s/^X//" >main/str.c <<'END_OF_main/str.c'
X/*++
X/* NAME
X/*    strcons,istrcmp,strvec,vecstr,split 3
X/* SUMMARY
X/*    string utility routines
X/* PROJECT
X/*    pc-mail
X/* PACKAGE
X/*    general stuff
X/* SYNOPSIS
X/*    #include "defs.h"
X/*
X/*    char *strcons(format,args)
X/*    char *format;
X/*
X/*    char *split(cpp, sep)
X/*    char **cpp;
X/*    char *sep;
X/*
X/*    int istrncmp(s1,s2,n)
X/*    char *s1,s2;
X/*    int n;
X/*
X/*    int istrcmp(s1,s2)
X/*    char *s1,s2;
X/*
X/*    char **strvec(string,separ)
X/*    char *string;
X/*    char *separ;
X/*
X/*    freevec(vec)
X/*    char **vec;
X/*
X/*    char *vecstr(vector,separ)
X/*    char **vector;
X/*    char *separ;
X/* DESCRIPTION
X/*    strcons() produces a formatted string, using printf()-like
X/*    arguments. Basically it is an sprintf() that returns a
X/*    pointer to the result. memory for the result is taken from
X/*    a small memory pool that is recycled upon successive calls.
X/*
X/*    split() searches the string pointed to by cpp for the occurrance
X/*    of the text token (a string not containing any of the characters
X/*    given in the "sep" argument). *cpp is updated if a token is
X/*    found; a null pointer is returned otherwise. This function
X/*    is an attempt to improve upon the strtok() function, which
X/*    can parse only one string at a time. It still modifies its
X/*    arguments, however.
X/*
X/*    istrcmp() is a case-insensitive version of the strcmp() function.
X/*
X/*    istrncmp() is a case-insensitive version of the strncmp() function.
X/*
X/*    strvec() breaks a null-terminated string using the separators given
X/*    in separ, and returns a null-terminated vector of pointers to the
X/*    resulting substrings. Memory for the vector and substrings are
X/*    allocated in dynamic memory. The original string is not modified.
X/*
X/*    freevec() frees storage allocated by strvec().
X/*
X/*    vecstr() takes a null-terminated vector of string pointers
X/*    and builds a string from the strings pointed to by the vector
X/*    argument, separated by the string in the separ argument.
X/*    Memory for the result is allocated in dynamic memory.
X/* FUNCTIONS AND MACROS
X/*    strtok(), malloc(), memcpy(), sprintf()
X/* DIAGNOSTICS
X/*    strvec(), vecstr() return a null pointer if there was not enough memory
X/*    avaliable to hold the result.
X/* BUGS
X/*    strcons() does not do smart garbage collection; it just uses
X/*    a circular buffer. The present implementation is not portable
X/*    to machines that pass arguments via registers.
X/*
X/*    strvec() cannot handle strings with more than BUFSIZ words.
X/*    strvec() uses strtok(), which may have side effects.
X/* AUTHOR(S)
X/*    W.Z. Venema
X/*    Eindhoven University of Technology
X/*    Department of Mathematics and Computer Science
X/*    Den Dolech 2, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
X/* CREATION DATE
X/*    Tue Apr  5 20:59:29 MET 1988
X/* LAST MODIFICATION
X/*    90/01/22 13:02:43
X/* VERSION/RELEASE
X/*    2.1
X/*--*/
X
X#include <stdio.h>
X#include <ctype.h>
X#include <varargs.h>
X
X#include "defs.h"
X
X#define    NBUF    4
X
X/* strcons - quick-and-dirty string constructor */
X
X/* VARARGS */
X
Xchar   *strcons(va_alist)
Xva_dcl
X{
X    va_list ap;
X    static char strbuf[NBUF][BUFSIZ];
X    static int where = 0;
X    register char *cp;
X    char   *fmt;
X
X    va_start(ap);
X    fmt = va_arg(ap, char *);
X    (void) vsprintf(cp = strbuf[where = (where + 1) % NBUF], fmt, ap);
X    va_end(ap);
X    return (cp);
X}
X
X/* istrcmp - case-insensitive string comparison */
X
X#define    LOW(c)    (isascii(c)&&isupper(c)?tolower(c):(c))
X
Xint     istrcmp(s1, s2)
Xregister char *s1;
Xregister char *s2;
X{
X    while (*s1 && (LOW(*s1) == LOW(*s2)))
X    s1++, s2++;
X    return (LOW(*s1) - LOW(*s2));
X}
X
X/* istrncmp - case-insensitive string comparison */
X
X#define    LOW(c)    (isascii(c)&&isupper(c)?tolower(c):(c))
X
Xint     istrncmp(s1, s2, n)
Xregister char *s1;
Xregister char *s2;
Xregister int n;
X{
X    while (n > 0 && *s1 && (LOW(*s1) == LOW(*s2)))
X    n--, s1++, s2++;
X    return (n > 0 ? LOW(*s1) - LOW(*s2) : 0);
X}
X
X/* strvec - make vector of substring pointers */
X
Xchar  **strvec(str, sep)
Xchar   *str;
Xchar   *sep;
X{
X#ifdef lint
X    static
X#endif
X    char   *tmp[BUFSIZ];        /* scratch substring pointer storage */
X    register char **cpp = tmp;
X    char   *sp;                /* ptr to private copy of original */
X    register int bytec;
X
X    /* make a copy of the original string */
X
X    if ((sp = malloc(strlen(str) + 1)) == 0)
X    return (0);
X    (void) strcpy(sp, str);
X
X    /* chop our copy at sequences of one or more separators */
X
X    for (*cpp = strtok(sp, sep); *cpp; *++cpp = strtok((char *) 0, sep))
X     /* void */ ;
X
X    /* now construct the vector of pointers to the substrings */
X
X    if ((cpp = (char **) malloc(bytec = (cpp - tmp + 1) * sizeof(*cpp))) == 0)
X    return (0);
X    return ((char **) memcpy((char *) cpp, (char *) tmp, bytec));
X}
X
X/* freevec - release storage allocated by strvec() */
X
Xfreevec(vec)
Xchar  **vec;
X{
X    free(vec[0]);
X    free((char *) vec);
X}
X
X/* vecstr - from null-terminated vector of string pointers to one flat string */
X
Xpublic char *vecstr(vec, sep)
Xchar  **vec;
Xchar   *sep;
X{
X    register char **cpp;
X    register int len = 0;        /* length of final string */
X    register char *cp;
X    register int flen = strlen(sep);    /* filler between substrings */
X
X    /* find out how big the resulting string will be */
X
X    for (cpp = vec; *cpp; cpp++)
X    len += strlen(*cpp) + flen;
X
X    /* allocate and initialize the result string */
X
X    if ((cp = malloc(len + 1)) == 0)
X    return (0);
X    *cp = '\0';
X
X    /* fill the resulting string */
X
X    for (cpp = vec; *cpp; cpp++) {
X    (void) strcat(cp, *cpp);
X    (void) strcat(cp, sep);
X    }
X    return (cp);
X}
X
X/* split - return next token in *cpp, update cpp */
X
Xpublic char *split(cpp, sep)
Xregister char **cpp;
Xregister char *sep;
X{
X    register char *start;
X    char   *end;
X    char   *strpbrk();
X
X    /*
X     * Find the beginning of the first token. If none is found, just return a
X     * null value. Otherwise, if there is a separator that follows the token,
X     * nullify it and advance *cpp to the first character after the nullified
X     * separator. If the token is not followed by a separator advance *cpp to
X     * the null byte that follows the token.
X     */
X
X    start = *cpp + strspn(*cpp, sep);
X
X    if (start[0] == 0) {
X    return (0);                /* no token */
X    } else if (end = strpbrk(start, sep)) {    /* look for separator */
X    *end = '\0';                /* nullify */
X    *cpp = end + 1;                /* advance beyond end */
X    return (start);                /* return token */
X    } else {
X    *cpp = start + strlen(start);        /* advance to terminator */
X    return (start);                /* return token */
X    }
X}
END_OF_main/str.c
if test 6415 -ne `wc -c <main/str.c`; then
    echo shar: \"main/str.c\" unpacked with wrong size!
fi
# end of overwriting check
fi
echo shar: End of archive 6 \(of 11\).
cp /dev/null ark6isdone
MISSING=""
for I in 1 2 3 4 5 6 7 8 9 10 11 ; do
    if test ! -f ark${I}isdone ; then
    MISSING="${MISSING} ${I}"
    fi
done
if test "${MISSING}" = "" ; then
    echo You have unpacked all 11 archives.
    rm -f ark[1-9]isdone ark[1-9][0-9]isdone
else
    echo You still need to unpack the following archives:
    echo "        " ${MISSING}
fi
##  End of shell archive.
exit 0