Usenet 1994 January/usenetsourcesnewsgroupsinfomagicjanuary1994.iso/sources/misc/volume1/8711/microemacs-3.9/8

Text File | 1987-11-17 | 78.1 KB | 2,465 lines

Article 84 of comp.sources.misc:
Path: tut!osu-cis!cbosgd!mandrill!hal!ncoast!allbery
From: [e-mail] (Daniel Lawrence)
Newsgroups: comp.sources.misc
Subject: MicroEmacs 3.9 (Part 8 of 16)
Message-ID: <[e-mail]>
Date: 14 Nov 87 21:11:14 GMT
Sender: [e-mail]
Lines: 2450
Approved: [e-mail]
X-Archive: comp.sources.misc/microemacs-3.9/7

# This is a shar archive.
# Remove everything above this line.
# Run the file through sh, not csh.
# (type `sh mes.8')
# If you do not see the message
#    `mes.8 completed!'
# then the file was incomplete.
echo extracting - line.c
sed 's/^X//' > line.c << 'FRIDAY_NIGHT'
X/*
X * The functions in this file are a general set of line management utilities.
X * They are the only routines that touch the text. They also touch the buffer
X * and window structures, to make sure that the necessary updating gets done.
X * There are routines in this file that handle the kill buffer too. It isn't
X * here for any good reason.
X *
X * Note that this code only updates the dot and mark values in the window list.
X * Since all the code acts on the current window, the buffer that we are
X * editing must be being displayed, which means that "b_nwnd" is non zero,
X * which means that the dot and mark values in the buffer headers are nonsense.
X */
X
X#include    <stdio.h>
X#include    "estruct.h"
X#include    "edef.h"
X
XKILL *ykbuf;    /* ptr to current kill buffer chunk being yanked */
Xint ykboff;    /* offset into that chunk */
X
X/*
X * This routine allocates a block of memory large enough to hold a LINE
X * containing "used" characters. The block is always rounded up a bit. Return
X * a pointer to the new block, or NULL if there isn't any memory left. Print a
X * message in the message line if no space.
X */
XLINE *lalloc(used)
X
Xregister int    used;
X
X{
X    register LINE    *lp;
X    register int    size;
X    char *malloc();
X
X    size = (used+NBLOCK-1) & ~(NBLOCK-1);
X    if (size == 0)                /* Assume that an empty */
X        size = NBLOCK;            /* line is for type-in. */
X    if ((lp = (LINE *) malloc(sizeof(LINE)+size)) == NULL) {
X        mlwrite("[OUT OF MEMORY]");
X        return (NULL);
X    }
X    lp->l_size = size;
X    lp->l_used = used;
X    return (lp);
X}
X
X/*
X * Delete line "lp". Fix all of the links that might point at it (they are
X * moved to offset 0 of the next line. Unlink the line from whatever buffer it
X * might be in. Release the memory. The buffers are updated too; the magic
X * conditions described in the above comments don't hold here.
X */
Xlfree(lp)
Xregister LINE    *lp;
X{
X    register BUFFER *bp;
X    register WINDOW *wp;
X
X    wp = wheadp;
X    while (wp != NULL) {
X        if (wp->w_linep == lp)
X            wp->w_linep = lp->l_fp;
X        if (wp->w_dotp    == lp) {
X            wp->w_dotp  = lp->l_fp;
X            wp->w_doto  = 0;
X        }
X        if (wp->w_markp == lp) {
X            wp->w_markp = lp->l_fp;
X            wp->w_marko = 0;
X        }
X        wp = wp->w_wndp;
X    }
X    bp = bheadp;
X    while (bp != NULL) {
X        if (bp->b_nwnd == 0) {
X            if (bp->b_dotp    == lp) {
X                bp->b_dotp = lp->l_fp;
X                bp->b_doto = 0;
X            }
X            if (bp->b_markp == lp) {
X                bp->b_markp = lp->l_fp;
X                bp->b_marko = 0;
X            }
X        }
X        bp = bp->b_bufp;
X    }
X    lp->l_bp->l_fp = lp->l_fp;
X    lp->l_fp->l_bp = lp->l_bp;
X    free((char *) lp);
X}
X
X/*
X * This routine gets called when a character is changed in place in the current
X * buffer. It updates all of the required flags in the buffer and window
X * system. The flag used is passed as an argument; if the buffer is being
X * displayed in more than 1 window we change EDIT t HARD. Set MODE if the
X * mode line needs to be updated (the "*" has to be set).
X */
Xlchange(flag)
Xregister int    flag;
X{
X    register WINDOW *wp;
X
X    if (curbp->b_nwnd != 1)         /* Ensure hard.     */
X        flag = WFHARD;
X    if ((curbp->b_flag&BFCHG) == 0) {    /* First change, so    */
X        flag |= WFMODE;         /* update mode lines.    */
X        curbp->b_flag |= BFCHG;
X    }
X    wp = wheadp;
X    while (wp != NULL) {
X        if (wp->w_bufp == curbp)
X            wp->w_flag |= flag;
X        wp = wp->w_wndp;
X    }
X}
X
Xinsspace(f, n)    /* insert spaces forward into text */
X
Xint f, n;    /* default flag and numeric argument */
X
X{
X    linsert(n, ' ');
X    backchar(f, n);
X}
X
X/*
X * linstr -- Insert a string at the current point
X */
X
Xlinstr(instr)
Xchar    *instr;
X{
X    register int status = TRUE;
X    char tmpc;
X
X    if (instr != NULL)
X        while ((tmpc = *instr) && status == TRUE) {
X            status = (tmpc == '\n'? lnewline(): linsert(1, tmpc));
X
X            /* Insertion error? */
X            if (status != TRUE) {
X                mlwrite("%%Out of memory while inserting");
X                break;
X            }
X            instr++;
X        }
X    return(status);
X}
X
X/*
X * Insert "n" copies of the character "c" at the current location of dot. In
X * the easy case all that happens is the text is stored in the line. In the
X * hard case, the line has to be reallocated. When the window list is updated,
X * take special care; I screwed it up once. You always update dot in the
X * current window. You update mark, and a dot in another window, if it is
X * greater than the place where you did the insert. Return TRUE if all is
X * well, and FALSE on errors.
X */
X
Xlinsert(n, c)
X{
X    register char    *cp1;
X    register char    *cp2;
X    register LINE    *lp1;
X    register LINE    *lp2;
X    register LINE    *lp3;
X    register int    doto;
X    register int    i;
X    register WINDOW *wp;
X
X    if (curbp->b_mode&MDVIEW)    /* don't allow this command if    */
X        return(rdonly());    /* we are in read only mode    */
X    lchange(WFEDIT);
X    lp1 = curwp->w_dotp;            /* Current line     */
X    if (lp1 == curbp->b_linep) {        /* At the end: special    */
X        if (curwp->w_doto != 0) {
X            mlwrite("bug: linsert");
X            return (FALSE);
X        }
X        if ((lp2=lalloc(n)) == NULL)    /* Allocate new line    */
X            return (FALSE);
X        lp3 = lp1->l_bp;        /* Previous line    */
X        lp3->l_fp = lp2;        /* Link in        */
X        lp2->l_fp = lp1;
X        lp1->l_bp = lp2;
X        lp2->l_bp = lp3;
X        for (i=0; i<n; ++i)
X            lp2->l_text[i] = c;
X        curwp->w_dotp = lp2;
X        curwp->w_doto = n;
X        return (TRUE);
X    }
X    doto = curwp->w_doto;            /* Save for later.    */
X    if (lp1->l_used+n > lp1->l_size) {    /* Hard: reallocate    */
X        if ((lp2=lalloc(lp1->l_used+n)) == NULL)
X            return (FALSE);
X        cp1 = &lp1->l_text[0];
X        cp2 = &lp2->l_text[0];
X        while (cp1 != &lp1->l_text[doto])
X            *cp2++ = *cp1++;
X        cp2 += n;
X        while (cp1 != &lp1->l_text[lp1->l_used])
X            *cp2++ = *cp1++;
X        lp1->l_bp->l_fp = lp2;
X        lp2->l_fp = lp1->l_fp;
X        lp1->l_fp->l_bp = lp2;
X        lp2->l_bp = lp1->l_bp;
X        free((char *) lp1);
X    } else {                /* Easy: in place    */
X        lp2 = lp1;            /* Pretend new line    */
X        lp2->l_used += n;
X        cp2 = &lp1->l_text[lp1->l_used];
X        cp1 = cp2-n;
X        while (cp1 != &lp1->l_text[doto])
X            *--cp2 = *--cp1;
X    }
X    for (i=0; i<n; ++i)            /* Add the characters    */
X        lp2->l_text[doto+i] = c;
X    wp = wheadp;                /* Update windows    */
X    while (wp != NULL) {
X        if (wp->w_linep == lp1)
X            wp->w_linep = lp2;
X        if (wp->w_dotp == lp1) {
X            wp->w_dotp = lp2;
X            if (wp==curwp || wp->w_doto>doto)
X                wp->w_doto += n;
X        }
X        if (wp->w_markp == lp1) {
X            wp->w_markp = lp2;
X            if (wp->w_marko > doto)
X                wp->w_marko += n;
X        }
X        wp = wp->w_wndp;
X    }
X    return (TRUE);
X}
X
X/*
X * Overwrite a character into the current line at the current position
X *
X */
X
Xlowrite(c)
X
Xchar c;        /* character to overwrite on current position */
X
X{
X    if (curwp->w_doto < curwp->w_dotp->l_used &&
X        (lgetc(curwp->w_dotp, curwp->w_doto) != '\t' ||
X         (curwp->w_doto) % 8 == 7))
X            ldelete(1L, FALSE);
X    return(linsert(1, c));
X}
X
X/*
X * lover -- Overwrite a string at the current point
X */
X
Xlover(ostr)
X
Xchar    *ostr;
X
X{
X    register int status = TRUE;
X    char tmpc;
X
X    if (ostr != NULL)
X        while ((tmpc = *ostr) && status == TRUE) {
X            status = (tmpc == '\n'? lnewline(): lowrite(tmpc));
X
X            /* Insertion error? */
X            if (status != TRUE) {
X                mlwrite("%%Out of memory while overwriting");
X                break;
X            }
X            ostr++;
X        }
X    return(status);
X}
X
X/*
X * Insert a newline into the buffer at the current location of dot in the
X * current window. The funny ass-backwards way it does things is not a botch;
X * it just makes the last line in the file not a special case. Return TRUE if
X * everything works out and FALSE on error (memory allocation failure). The
X * update of dot and mark is a bit easier then in the above case, because the
X * split forces more updating.
X */
Xlnewline()
X{
X    register char    *cp1;
X    register char    *cp2;
X    register LINE    *lp1;
X    register LINE    *lp2;
X    register int    doto;
X    register WINDOW *wp;
X
X    if (curbp->b_mode&MDVIEW)    /* don't allow this command if    */
X        return(rdonly());    /* we are in read only mode    */
X    lchange(WFHARD);
X    lp1  = curwp->w_dotp;            /* Get the address and    */
X    doto = curwp->w_doto;            /* offset of "."    */
X    if ((lp2=lalloc(doto)) == NULL)     /* New first half line    */
X        return (FALSE);
X    cp1 = &lp1->l_text[0];            /* Shuffle text around    */
X    cp2 = &lp2->l_text[0];
X    while (cp1 != &lp1->l_text[doto])
X        *cp2++ = *cp1++;
X    cp2 = &lp1->l_text[0];
X    while (cp1 != &lp1->l_text[lp1->l_used])
X        *cp2++ = *cp1++;
X    lp1->l_used -= doto;
X    lp2->l_bp = lp1->l_bp;
X    lp1->l_bp = lp2;
X    lp2->l_bp->l_fp = lp2;
X    lp2->l_fp = lp1;
X    wp = wheadp;                /* Windows        */
X    while (wp != NULL) {
X        if (wp->w_linep == lp1)
X            wp->w_linep = lp2;
X        if (wp->w_dotp == lp1) {
X            if (wp->w_doto < doto)
X                wp->w_dotp = lp2;
X            else
X                wp->w_doto -= doto;
X        }
X        if (wp->w_markp == lp1) {
X            if (wp->w_marko < doto)
X                wp->w_markp = lp2;
X            else
X                wp->w_marko -= doto;
X        }
X        wp = wp->w_wndp;
X    }
X    return (TRUE);
X}
X
X/*
X * This function deletes "n" bytes, starting at dot. It understands how do deal
X * with end of lines, etc. It returns TRUE if all of the characters were
X * deleted, and FALSE if they were not (because dot ran into the end of the
X * buffer. The "kflag" is TRUE if the text should be put in the kill buffer.
X */
Xldelete(n, kflag)
X
Xlong n;     /* # of chars to delete */
Xint kflag;    /* put killed text in kill buffer flag */
X
X{
X    register char    *cp1;
X    register char    *cp2;
X    register LINE    *dotp;
X    register int    doto;
X    register int    chunk;
X    register WINDOW *wp;
X
X    if (curbp->b_mode&MDVIEW)    /* don't allow this command if    */
X        return(rdonly());    /* we are in read only mode    */
X    while (n != 0) {
X        dotp = curwp->w_dotp;
X        doto = curwp->w_doto;
X        if (dotp == curbp->b_linep)    /* Hit end of buffer.    */
X            return (FALSE);
X        chunk = dotp->l_used-doto;    /* Size of chunk.    */
X        if (chunk > n)
X            chunk = n;
X        if (chunk == 0) {        /* End of line, merge.    */
X            lchange(WFHARD);
X            if (ldelnewline() == FALSE
X            || (kflag!=FALSE && kinsert('\n')==FALSE))
X                return (FALSE);
X            --n;
X            continue;
X        }
X        lchange(WFEDIT);
X        cp1 = &dotp->l_text[doto];    /* Scrunch text.    */
X        cp2 = cp1 + chunk;
X        if (kflag != FALSE) {        /* Kill?        */
X            while (cp1 != cp2) {
X                if (kinsert(*cp1) == FALSE)
X                    return (FALSE);
X                ++cp1;
X            }
X            cp1 = &dotp->l_text[doto];
X        }
X        while (cp2 != &dotp->l_text[dotp->l_used])
X            *cp1++ = *cp2++;
X        dotp->l_used -= chunk;
X        wp = wheadp;            /* Fix windows        */
X        while (wp != NULL) {
X            if (wp->w_dotp==dotp && wp->w_doto>=doto) {
X                wp->w_doto -= chunk;
X                if (wp->w_doto < doto)
X                    wp->w_doto = doto;
X            }
X            if (wp->w_markp==dotp && wp->w_marko>=doto) {
X                wp->w_marko -= chunk;
X                if (wp->w_marko < doto)
X                    wp->w_marko = doto;
X            }
X            wp = wp->w_wndp;
X        }
X        n -= chunk;
X    }
X    return (TRUE);
X}
X
X/* getctext:    grab and return a string with the text of
X        the current line
X*/
X
Xchar *getctext()
X
X{
X    register LINE *lp;    /* line to copy */
X    register int size;    /* length of line to return */
X    register char *sp;    /* string pointer into line */
X    register char *dp;    /* string pointer into returned line */
X    char rline[NSTRING];    /* line to return */
X
X    /* find the contents of the current line and its length */
X    lp = curwp->w_dotp;
X    sp = lp->l_text;
X    size = lp->l_used;
X    if (size >= NSTRING)
X        size = NSTRING - 1;
X
X    /* copy it across */
X    dp = rline;
X    while (size--)
X        *dp++ = *sp++;
X    *dp = 0;
X    return(rline);
X}
X
X/* putctext:    replace the current line with the passed in text    */
X
Xputctext(iline)
X
Xchar *iline;    /* contents of new line */
X
X{
X    register int status;
X
X    /* delete the current line */
X    curwp->w_doto = 0;    /* starting at the beginning of the line */
X    if ((status = killtext(TRUE, 1)) != TRUE)
X        return(status);
X
X    /* insert the new line */
X    if ((status = linstr(iline)) != TRUE)
X        return(status);
X    status = lnewline();
X    backline(TRUE, 1);
X    return(status);
X}
X
X/*
X * Delete a newline. Join the current line with the next line. If the next line
X * is the magic header line always return TRUE; merging the last line with the
X * header line can be thought of as always being a successful operation, even
X * if nothing is done, and this makes the kill buffer work "right". Easy cases
X * can be done by shuffling data around. Hard cases require that lines be moved
X * about in memory. Return FALSE on error and TRUE if all looks ok. Called by
X * "ldelete" only.
X */
Xldelnewline()
X{
X    register char    *cp1;
X    register char    *cp2;
X    register LINE    *lp1;
X    register LINE    *lp2;
X    register LINE    *lp3;
X    register WINDOW *wp;
X
X    if (curbp->b_mode&MDVIEW)    /* don't allow this command if    */
X        return(rdonly());    /* we are in read only mode    */
X    lp1 = curwp->w_dotp;
X    lp2 = lp1->l_fp;
X    if (lp2 == curbp->b_linep) {        /* At the buffer end.    */
X        if (lp1->l_used == 0)        /* Blank line.        */
X            lfree(lp1);
X        return (TRUE);
X    }
X    if (lp2->l_used <= lp1->l_size-lp1->l_used) {
X        cp1 = &lp1->l_text[lp1->l_used];
X        cp2 = &lp2->l_text[0];
X        while (cp2 != &lp2->l_text[lp2->l_used])
X            *cp1++ = *cp2++;
X        wp = wheadp;
X        while (wp != NULL) {
X            if (wp->w_linep == lp2)
X                wp->w_linep = lp1;
X            if (wp->w_dotp == lp2) {
X                wp->w_dotp  = lp1;
X                wp->w_doto += lp1->l_used;
X            }
X            if (wp->w_markp == lp2) {
X                wp->w_markp  = lp1;
X                wp->w_marko += lp1->l_used;
X            }
X            wp = wp->w_wndp;
X        }
X        lp1->l_used += lp2->l_used;
X        lp1->l_fp = lp2->l_fp;
X        lp2->l_fp->l_bp = lp1;
X        free((char *) lp2);
X        return (TRUE);
X    }
X    if ((lp3=lalloc(lp1->l_used+lp2->l_used)) == NULL)
X        return (FALSE);
X    cp1 = &lp1->l_text[0];
X    cp2 = &lp3->l_text[0];
X    while (cp1 != &lp1->l_text[lp1->l_used])
X        *cp2++ = *cp1++;
X    cp1 = &lp2->l_text[0];
X    while (cp1 != &lp2->l_text[lp2->l_used])
X        *cp2++ = *cp1++;
X    lp1->l_bp->l_fp = lp3;
X    lp3->l_fp = lp2->l_fp;
X    lp2->l_fp->l_bp = lp3;
X    lp3->l_bp = lp1->l_bp;
X    wp = wheadp;
X    while (wp != NULL) {
X        if (wp->w_linep==lp1 || wp->w_linep==lp2)
X            wp->w_linep = lp3;
X        if (wp->w_dotp == lp1)
X            wp->w_dotp  = lp3;
X        else if (wp->w_dotp == lp2) {
X            wp->w_dotp  = lp3;
X            wp->w_doto += lp1->l_used;
X        }
X        if (wp->w_markp == lp1)
X            wp->w_markp  = lp3;
X        else if (wp->w_markp == lp2) {
X            wp->w_markp  = lp3;
X            wp->w_marko += lp1->l_used;
X        }
X        wp = wp->w_wndp;
X    }
X    free((char *) lp1);
X    free((char *) lp2);
X    return (TRUE);
X}
X
X/*
X * Delete all of the text saved in the kill buffer. Called by commands when a
X * new kill context is being created. The kill buffer array is released, just
X * in case the buffer has grown to immense size. No errors.
X */
Xkdelete()
X{
X    KILL *kp;    /* ptr to scan kill buffer chunk list */
X
X    if (kbufh != NULL) {
X
X        /* first, delete all the chunks */
X        kbufp = kbufh;
X        while (kbufp != NULL) {
X            kp = kbufp->d_next;
X            free(kbufp);
X            kbufp = kp;
X        }
X
X        /* and reset all the kill buffer pointers */
X        kbufh = kbufp = NULL;
X        kused = KBLOCK;
X    }
X}
X
X/*
X * Insert a character to the kill buffer, allocating new chunks as needed.
X * Return TRUE if all is well, and FALSE on errors.
X */
X
Xkinsert(c)
X
Xint c;        /* character to insert in the kill buffer */
X
X{
X    KILL *nchunk;    /* ptr to newly malloced chunk */
X
X    /* check to see if we need a new chunk */
X    if (kused >= KBLOCK) {
X        if ((nchunk = (KILL *)malloc(sizeof(KILL))) == NULL)
X            return(FALSE);
X        if (kbufh == NULL)    /* set head ptr if first time */
X            kbufh = nchunk;
X        if (kbufp != NULL)    /* point the current to this new one */
X            kbufp->d_next = nchunk;
X        kbufp = nchunk;
X        kbufp->d_next = NULL;
X        kused = 0;
X    }
X
X    /* and now insert the character */
X    kbufp->d_chunk[kused++] = c;
X    return(TRUE);
X}
X
X/*
X * Yank text back from the kill buffer. This is really easy. All of the work
X * is done by the standard insert routines. All you do is run the loop, and
X * check for errors. Bound to "C-Y".
X */
Xyank(f, n)
X{
X    register int    c;
X    register int    i;
X    register char    *sp;    /* pointer into string to insert */
X    KILL *kp;        /* pointer into kill buffer */
X
X    if (curbp->b_mode&MDVIEW)    /* don't allow this command if    */
X        return(rdonly());    /* we are in read only mode    */
X    if (n < 0)
X        return (FALSE);
X    /* make sure there is something to yank */
X    if (kbufh == NULL)
X        return(TRUE);        /* not an error, just nothing */
X
X    /* for each time.... */
X    while (n--) {
X        kp = kbufh;
X        while (kp != NULL) {
X            if (kp->d_next == NULL)
X                i = kused;
X            else
X                i = KBLOCK;
X            sp = kp->d_chunk;
X            while (i--) {
X                if ((c = *sp++) == '\n') {
X                    if (lnewline() == FALSE)
X                        return (FALSE);
X                } else {
X                    if (linsert(1, c) == FALSE)
X                        return (FALSE);
X                }
X            }
X            kp = kp->d_next;
X        }
X    }
X    return (TRUE);
X}
FRIDAY_NIGHT
echo extracting - lock.c
sed 's/^X//' > lock.c << 'FRIDAY_NIGHT'
X/*    LOCK:    File locking command routines for MicroEMACS
X        written by Daniel Lawrence
X                                */
X
X#include <stdio.h>
X#include "estruct.h"
X#include "edef.h"
X
X#if    FILOCK
X#if    BSD
X#include <sys/errno.h>
X
Xextern int sys_nerr;        /* number of system error messages defined */
Xextern char *sys_errlist[];    /* list of message texts */
Xextern int errno;        /* current error */
X
Xchar *lname[NLOCKS];    /* names of all locked files */
Xint numlocks;        /* # of current locks active */
X
X/* lockchk:    check a file for locking and add it to the list */
X
Xlockchk(fname)
X
Xchar *fname;    /* file to check for a lock */
X
X{
X    register int i;        /* loop indexes */
X    register int status;    /* return status */
X    char *undolock();
X
X    /* check to see if that file is already locked here */
X    if (numlocks > 0)
X        for (i=0; i < numlocks; ++i)
X            if (strcmp(fname, lname[i]) == 0)
X                return(TRUE);
X
X    /* if we have a full locking table, bitch and leave */
X    if (numlocks == NLOCKS) {
X        mlwrite("LOCK ERROR: Lock table full");
X        return(ABORT);
X    }
X
X    /* next, try to lock it */
X    status = lock(fname);
X    if (status == ABORT)    /* file is locked, no override */
X        return(ABORT);
X    if (status == FALSE)    /* locked, overriden, dont add to table */
X        return(TRUE);
X
X    /* we have now locked it, add it to our table */
X    lname[++numlocks - 1] = (char *)malloc(strlen(fname) + 1);
X    if (lname[numlocks - 1] == NULL) {    /* malloc failure */
X        undolock(fname);        /* free the lock */
X        mlwrite("Cannot lock, out of memory");
X        --numlocks;
X        return(ABORT);
X    }
X
X    /* everthing is cool, add it to the table */
X    strcpy(lname[numlocks-1], fname);
X    return(TRUE);
X}
X
X/*    lockrel:    release all the file locks so others may edit */
X
Xlockrel()
X
X{
X    register int i;        /* loop index */
X    register int status;    /* status of locks */
X    register int s;        /* status of one unlock */
X
X    status = TRUE;
X    if (numlocks > 0)
X        for (i=0; i < numlocks; ++i) {
X            if ((s = unlock(lname[i])) != TRUE)
X                status = s;
X            free(lname[i]);
X        }
X    numlocks = 0;
X    return(status);
X}
X
X/* lock:    Check and lock a file from access by others
X        returns    TRUE = files was not locked and now is
X            FALSE = file was locked and overridden
X            ABORT = file was locked, abort command
X*/
X
Xlock(fname)
X
Xchar *fname;    /* file name to lock */
X
X{
X    register char *locker;    /* lock error message */
X    register int status;    /* return status */
X    char msg[NSTRING];    /* message string */
X    char *dolock();
X
X    /* attempt to lock the file */
X    locker = dolock(fname);
X    if (locker == NULL)    /* we win */
X        return(TRUE);
X
X    /* file failed...abort */
X    if (strncmp(locker, "LOCK", 4) == 0) {
X        lckerror(locker);
X        return(ABORT);
X    }
X
X    /* someone else has it....override? */
X    strcpy(msg, "File in use by ");
X    strcat(msg, locker);
X    strcat(msg, ", overide?");
X    status = mlyesno(msg);        /* ask them */
X    if (status == TRUE)
X        return(FALSE);
X    else
X        return(ABORT);
X}
X
X/*    unlock:    Unlock a file
X        this only warns the user if it fails
X                            */
X
Xunlock(fname)
X
Xchar *fname;    /* file to unlock */
X
X{
X    register char *locker;    /* undolock return string */
X    char *undolock();
X
X    /* unclock and return */
X    locker = undolock(fname);
X    if (locker == NULL)
X        return(TRUE);
X
X    /* report the error and come back */
X    lckerror(locker);
X    return(FALSE);
X}
X
Xlckerror(errstr)    /* report a lock error */
X
Xchar *errstr;        /* lock error string to print out */
X
X{
X    char obuf[NSTRING];    /* output buffer for error message */
X
X    strcpy(obuf, errstr);
X    strcat(obuf, " - ");
X    if (errno < sys_nerr)
X        strcat(obuf, sys_errlist[errno]);
X    else
X        strcat(obuf, "[can not get system error message]");
X    mlwrite(obuf);
X}
X#endif
X#else
Xlckhello()    /* dummy function */
X{
X}
X#endif
FRIDAY_NIGHT
echo extracting - main.c
sed 's/^X//' > main.c << 'FRIDAY_NIGHT'
X/*
X *    MicroEMACS 3.9
X *             written by Dave G. Conroy.
X *            substatially modified by Daniel M. Lawrence
X *
X *    (C)opyright 1987 by Daniel M. Lawrence
X *    MicroEMACS 3.9 can be copied and distributed freely for any
X *    non-commercial purposes. MicroEMACS 3.9 can only be incorporated
X *    into commercial software with the permission of the current author.
X *
X * This file contains the main driving routine, and some keyboard processing
X * code, for the MicroEMACS screen editor.
X *
X * REVISION HISTORY:
X *
X * 1.0  Steve Wilhite, 30-Nov-85
X *      - Removed the old LK201 and VT100 logic. Added code to support the
X *        DEC Rainbow keyboard (which is a LK201 layout) using the the Level
X *        1 Console In ROM INT. See "rainbow.h" for the function key defs
X *      Steve Wilhite, 1-Dec-85
X *      - massive cleanup on code in display.c and search.c
X *
X * 2.0  George Jones, 12-Dec-85
X *      - Ported to Amiga.
X *
X * 3.0  Daniel Lawrence, 29-Dec-85
X *      - rebound keys/added new fast buffered I/O for AMIGA
X *    - added META- repeat commands
X *    - added reposition default to center screen (yeah!)
X *    - changed exit with modified buffers message
X *    - made filesave tell us what it is doing
X *    - changed search string entry to terminate with <ESC>
X *      so we can use <NL> in search/replace strings
X *    - updated version number in mode line to 3.0
X *    12-Jan-86
X *    - Added code to reconize the search/replace functions
X *    - Added code to perform search/replace & query functions
X *    14-Jan-86
X *    - moved search logic to separate function in search.c
X *    - added replace and query replace functions
X *    - separated out control key expansions to be used by others in search.c
X *    15-Jan-86
X *    - changed "visiting" to finding
X *    - changed yes/no responses to not need return
X *    - cleaned up various messages
X *    16-jan-86
X *    - fixed spurious spawn message in MSDOS
X *    - added ^X-S synonym to save command
X *    - moved escape to shell to ^X-C
X *    21-jan-86
X *    - added code to suspend shell under BSD
X *    22-jan-86
X *    - added function key support (SPEC) under MSDOS
X *    - Abort now prints [Aborted] on message line
X *    23-jan-86
X *    - Added modes and commands to set/unset them
X *    24-jan-86
X *    - Added Goto Line command
X *    - added Rename Buffer command
X *    28-jan-86
X *    - added goto beginning and end of paragraph commands (META-P/META-N)
X *    - re-wrote kdelete to use realloc. Gained MUCH speed here when
X *      doing large wipes on both UNIX and MSDOS. Changed kill buffer
X *      allocation block size from 256 bytes to 1 k
X *    29-jan-86
X *    - moved extern function declarations to efunc.h
X *    - made name[] name binding table
X *    30-jan-86
X *    - fixed Previous/Next paragraph command not to wrap around EOF
X *    - added Fill Paragraph command (META-Q)
X *    4-feb-86
X *    - added code to properly display long lines, scrolling them right
X *      to left
X *    5-feb-85
X *    - rewrote code to right/left scroll...much better
X *    - added shifted arrow keys on IBMPC
X *    6-feb-85
X *    - add option to allow forward-word to jump to beginning of
X *      next word instead of end of current one. This is different from
X *      other emacs' but can be configured off in estruct.h
X *    - added VIEW mode to allow a buffer to be read only
X *       (-v switch on command line will activate this)
X *    - changed quick exit to write out ALL changed buffers!!!
X *      MAKE SURE YOU KNOW THIS WHEN META-Zing
X *    10-feb-86
X *    - added handling of lines longer than allowed on file read in
X *      (they wrap on additional lines)
X *    - made having space clear the message line and NOT insert itself
X *      a configuration option in ed.h
X *    11-feb-86
X *    - added Describe-command and Help commands.
X *    13-feb-86
X *    - added View file command (^X ^V) and finished HELP command
X *    14-feb-86
X *    - added option to let main loop skip update if type ahead commands
X *       are queued up
X *    16-feb-86
X *    - added Insert File command
X *    17-feb-86
X *    - added scroll next window up/down commands
X *    18-feb-86
X *    - added CMODE indentation
X *    - re-arranged header files to standardize extern and global
X *      definitions
X *    - changed version number to 3.2
X *    - added numeric arguments to search, reverse search and
X *      search and replace
X *    24-feb-86
X *    - added Bind To Key function (^C for now) to allow the user
X *      to change his command keys
X *    - added Unbind key function (M-^C for now)
X *    - added execute named command to execute unbound commands (M-X)
X *    - added describe bindings command (not bound)
X *    - changed version number to 3.3
X *    25-feb-86
X *    - scrapped CERROR mode (too many compilers)
X *    - added EXACT mode for case sensitive searchers
X *    26-feb-86
X *    - added command completion on execute named command and
X *      all routined grabbing a command name
X *    - adding execute-command-line command and its support functions
X *      (in preparation for sourcing files)
X *    - added Execute Buffer command
X *    27-feb-86
X *    - added execute(source) file command and added code to automatically
X *      execute emacs.rc (or .emacsrc on UNIX) before initial read in
X *    - changed version number to 3.4
X *    4-mar-86
X *    - changed word delete to be consistant with word move (it gets
X *      rid of the inter word space now) This is configurable with the
X *      NFWORD symbol in estruct.h
X *    - added B_ACTIVE entry to the buffer table. Let emacs read multiple
X *      file names from the command line and only read them in as needed
X *    5-mar-85
X *    - rewrote command line parser to get rid of my patchy code
X *    - changed version number to 3.5
X *    1-apr-86
X *    - added support for Aztec C 3.20e under MSDOS
X *    - fixed bug in mlwrite on ADM3's and their ilk under V7
X *    - added insertion of pounds in column one under CMODE
X *    - changed version number to 3.6
X *    3-apr-86
X *    - added next-buffer command (^X-X)
X *    5-apr-86
X *    - added kill paragraph command (M-^W)
X *    - changed fill-paragraph to leave 2 spaces after a period at the
X *      end of a word.
X *    - added OVERWRITE mode
X *    7-apr-86
X *    - fixed overwrite mode to handle tabs
X *    8-apr-86
X *    - added add/delete global mode (<ESC>M & <ESC> ^M) commands
X *    9-apr-86
X *    - added insert space command
X *    - moved bindings around        ^C    insert space
X *                    M-K    bind-to-key
X *                    INSERT    insert space
X *                    DELETE    forwdel
X *    - added hunt forward and hunt reverse commands
X *    10-apr-86
X *    - fixed bug in DOBUF with non-terminated command string
X *    15-apr-86
X *    - fixed tab expansion bug in DISPLAY which hung the AMIGA
X *      (sent in by Dawn Banks)
X *    - fixed curcol problen if forwline/backline during keyboard
X *      macro execution (sent in by Ernst Christen)
X *    - added AMIGA function/cursor key support
X *    - fixed nonterminating <NL> replacement bug
X *    - fixed word wrapping problems
X *    16-apr-86
X *    - updated documentation and froze development for 3.6 net release
X *    23-apr-86    version 3.6a
X *    - added foreground and background colors. Setable with the
X *      add mode commands for the moment
X *    24-apr-86
X *    - added command to pipe CLI output to a buffer
X *    25-apr-86
X *    - added Dana Hoggatt's code to replace Lattice's sick system()
X *      function. Now we no longer care what the switchar is.
X *    - cleaned up the positioning on several of the spawing commands
X *    26-apr-86
X *    - added an output flush in vttidy(). Unix really appreciates this.
X *    - added filter-buffer (^X#) command to send a buffer through
X *      a DOS filter
X *    - made automatic CMODE on .c and .h file compilation dependant
X *      in estruct.h
X *    1-may-86
X *    - optimized some code in update(). It certainly need a lot more.
X *    - added Aztec profiling capabilities. These are conditional on
X *      the APROF symbol in estruct.h
X *    2-may-86
X *    - added (u)ndo command in query-replace. undoes last repalce.
X *    6-may-86
X *    - re-organized and wrote the update() function in display.c
X *      Now my color hacks are in the right places and the code can be
X *      understood.
X *    [Released version 3.6f for BETA test sites]
X *    8-may-86
X *    - fixed bug in new display routine to wrap cursor on extended
X *      lines at the right time
X *    - modified the buffer-position command to give reasonable info
X *    9-may-86
X *    - improved the word wrap algorithm as not to discard non-space
X *      delimiters. The backscan now looks for white space rather than
X *      !inword().
X *    [Released version 3.6g to Krannert]
X *    10-may-86
X *    - Added IBMPC.C an IBM-PC specific display driver. This makes paging
X *      4-6 times faster. Also made some conditional changes to DISPLAY.C
X *      to eliminate the pscreen[] if using the PC driver.
X *    [changed version number to 3.6i]
X *    12-may-86
X *    - added delete-window (^X 0) command to dispose of a single window
X *    - fixed problem with multiple prefixes from a command line which
X *      was reported by John Gamble
X *    14-may-86
X *    - Added Aztec support for the IBMPC display driver. Had to
X *      readjust some includes and defines for this.
X *    - fixed bug in delete-window.
X *    - fixed some bizarre behavior with the cursor after coming back
X *      from spawn calls.
X *    [changed version number to 3.7 freezing development for net release]
X *    15-may-86
X *    - (that didn't last long...) Added execute-macro-(1 thru 20) commands
X *      to execute macro buffers (named "[Macro nn]")
X *    - changed BFTEMP to BFINVS and cleaned up treatment of invisible
X *      buffers.
X *    16-may-86
X *    - added store-macro (unbound) to store any executed command lines to
X *      macro buffer.
X *    - added clear-message-line (unbound) command to do just that
X *    - added resize-window command to change a window's size to the
X *      specified argument
X *    - improved help's logic not to re-read the file if it was already
X *      in a buffer
X *    - added MAGIC mode to all structures and command tables, but the
X *      regular expression code that John Gamble is writing is not ready.
X *    18-may-86
X *    - added interactive prompt requests in command line execution (i.e.
X *      while executing a macro, a parameter starting with an at sign (@)
X *      causes emacs to prompt with the rest of the parameter and return
X *      the resulting input as the value of the parameter).
X *    - added arguments to split-current-window to force the cursor into
X *      the upper or lower window.
X *    20-may-86
X *    - added support for the Microsoft C compiler as per the changes
X *      sent in by Oliver Sharp
X *    - made some upgrades and fixes for VMS sent in by Guy Streeter
X *    21-may-86
X *    - fixed an Aztec bug in ttgetc by clearing the upper byte
X *    - fixed buf in CMODE with #preprocesser input (bug fix submitted by
X *      Willis of unknown path)
X *    - added support of alternative startup file ( @<filename> ) in
X *      the command line
X *    - added ^Q quoting in interactive input (mlreplyt()).
X *    - added re-binding of meta-prefix and ctlx-prefix
X *    22-may-86
X *    - reorganized getkey routines to make more sense and let prefix
X *      binding work properly.
X *    23-may-86
X *    - checked new code on BSD4.2 and made a few fixes
X *    - added optional fence matching while in CMODE
X *    - added goto and search command line arguments by Mike Spitzer
X *    26-may-86
X *    - added parameter fetching from buffers
X *    27-may-86
X *    - fixed some HP150 bugs......
X *    31-may-86
X *    - Added Wang PC keyboard support from modifications by
X *      Sid Shapiro @ Wang Institute
X *    - Fixed some reverse video bugs with code submitted by Peter Chubb
X *    - Fixed bug in nextbuffer reported by Dave Forslund
X *    - added system V support (USG) from Linwood Varney
X *    2-jun-86
X *    - changed defines to just define one Unix define (for example,
X *      just define BSD for Unix BSD 4.2)
X *    - Added Incremental search functions written by D. R. Banks
X *      in file ISEARCH.C
X *    - added insert-string (unbound) command to help the macro
X *      language out.
X *    - added unmark-buffer (M-~) command to turn off the current buffers
X *      change flag
X *    - fixed nxtarg to truncate strings longer than asked for max length
X *    4-jun-86
X *    - added special characters in command line tokens. Tilde (~) is
X *      the special lead-in character for "nrtb".
X *    - Fixed bad ifdef in Aztec code so it could look at HOME dir
X *      for startup, help, and emacs.rc files
X *    6-jun-86
X *    - make delete word commands clear the kill buffer if not after another
X *      kill command
X *    11-jun-86
X *    - made ~@ in string arguments pass as char(192) to nxtarg() so one can
X *      quote @ at the beginning of string arguments
X *    - changed buffer size vars in listbuffers() to long (for big files)
X *    - re-wrote buffer-position command to be much faster
X *    12-jun-86
X *    - added count-words (M-^C) command to count the words/chars and
X *      lines in a region
X *    - changed regions so they could be larger than 65535 (short ->
X *      long in the REGION structure)
X *    - changed ldelete() and all callers to use a long size. The kill
X *      buffer will still have a problem >65535 that can not be solved
X *      until I restructure it.
X *    - grouped paragraph commands and word count together under symbol
X *      WORDPRO to allow them to be conditionally made (or not)
X *    13-jun-86
X *    - re-wrote kill buffer routines again. Now they support an unlimited
X *      size kill buffer, and are (in theory) faster.
X *    - changed delete-next-word (M-D) to not eat the newline after a word,
X *      instead it checks and eats a newline at the cursor.
X *    17-jun-86
X *    - added numeric argument to next/previous-window to access the nth
X *      window from the top/bottom
X *    - added support for the Data General 10 MSDOS machine
X *    - added save-window (unbound) and restore-window (unbound) commands
X *      for the use of the menu script. Save-window remembers which window
X *      is current, and restore-window returns the cursor to that window.
X *    20-jun-86
X *    - fixed a bug with the fence matching locking up near the beginning
X *      of a buffer
X *    - added argument to update to selectively force a complete update
X *    - added update-screen (unbound) command so macros can force a
X *      screen update
X *    21-jun-86
X *    - rearranged token() and nxtarg() calls so that command names and
X *      repeat counts could also be prompted and fetched from buffers
X *      [this broke later with the exec re-write....]
X *    - added write-message (unbound) command to write out a message
X *      on the message line (for macros)
X *    - changed ifdef's so that color modes are recognized as legal in
X *      b/w version, and simply do nothing (allowing us to use the same
X *      script files)
X *    [Released version 3.7 on July 1 to the net and elswhere]
X *    2-jul-86
X *    - Changed search string terminator to always be the meta character
X *      even if it is rebound.
X *    3-jul-86
X *    - removed extra calls to set color in startup code. This caused the
X *      original current window to always be the global colors.
X *    7-jul-86
X *    - Fixed bugs in mlreplyt() to work properly with all terminators
X *      including control and spec characters
X *    22-jul-86
X *    - fixed replaces() so that it will return FALSE properly on the
X *      input of the replacement string.
X *    - added a definition for FAILED as a return type.....
X *    - changed version number to 3.7b
X *    23-jul-86
X *    - fixed o -> 0 problem in TERMIO.C
X *    - made ^U universal-argument re-bindable
X *    - wrote atoi() for systems (like Aztec) where it acts strangely
X *    - changed version number to 3.7c
X *    25-jul-86
X *    - make ^G abort-command rebindable
X *    29-jul-86
X *    - added HP110 Portable Computer support
X *    - changed version number to 3.7d
X *    30-jul-86
X *    - Fixed a couple of errors in the new VMS code as pointer
X *      out by Ken Shacklford
X *    - split terminal open/close routines into screen and keyboard
X *      open/close routines
X *    - closed the keyboard during all disk I/O so that OS errors
X *      can be respoded to correctly (especially on the HP150)
X *    - changed version number to 3.7e
X *    31-jul-86
X *    - added label-function-key (unbound) command under symbol FLABEL
X *      (primarily for the HP150)
X *    4-aug-86
X *    - added fixes for Microsoft C as suggested by ihnp4!ihuxm!gmd1
X *        <<remember to fix [list] deletion bug as reported
X *          by craig@hp-pcd>>
X *    8-aug-86
X *    - fixed beginning misspelling error everywhere
X *    - fixed some more MSC errors
X *    - changed version number to 3.7g
X *    20-aug-86
X *    - fixed CMODE .h scanning bug
X *    - changed version number to 3.7h
X *    30-aug-86
X *    - fixed killing renamed [list] buffer (it can't) as submitted
X *      by James Aldridge
X *    - Added code to allow multiple lines to display during
X *      vertical retrace
X *      [total disaster....yanked it back out]
X *    9-sep-86
X *    - added M-A (apropos) command to list commands containing a substring.
X *    - fixed an inefficiency in the display update code submitted
X *      by William W. Carlson (wwc@pur-ee)
X *    10-sep-86
X *    - added Dana Hoggatt's code for encryption and spliced it into the
X *      proper commands. CRYPT mode now triggers encryption.
X *    - added -k flag to allow encryption key (no spaces) in command line
X *    14-sep-86
X *    - added missing lastflag/thisflag processing to docmd()
X *    - changed version to 3.7i and froze for partial release via mail
X *      and BBS
X *    05-oct-86
X *    - changed some strcpys in MAIN.C to strncpys as suggested by John
X *      Gamble
X *    - replaces SEARCH.C and ISEARCH.C with versions modified by
X *      John Gamble
X *    10-oct-86
X *    - removed references to lflick....it just won't work that way.
X *    - removed defines LAT2 and LAT3...the code no longer is Lattice
X *      version dependant.
X *    14-oct-86
X *    - changed spawn so that it will not not pause if executed from
X *      a command line
X *    15-oct-86
X *    - added argument concatination (+) to the macro parsing
X *    - added [] as fence pairs
X *    16-oct-86
X *    - rewrote all macro line parsing routines and rearranged the
X *      mlreply code. Saved 6K!!! Have blazed the path for expanding
X *      the command language.
X *    17-oct-86
X *    - added new keyboard macro routines (plus a new level to the
X *      input character function)
X *    22-oct-86
X *    - improved EGA cursor problems
X *    - added -r (restricted) switch to command line for BBS use
X *    06-nov-86
X *    - fixed terminator declarations from char to int in getarg() and
X *      nxtarg() in EXEC.C as pointed out by John Gamble
X *    07-nov-86
X *    - made wordrap() user callable as wrap-word (M-FNW) and changed
X *      the getckey() routine so that illegal keystrokes (too many
X *      prefixes set) could be used for internal bindings. When word
X *      wrap conditions are met, the keystroke M-FNW is executed. Added
X *      word wrap check/call to newline().
X *    11-nov-86
X *    - added and checked support for Mark Williams C 86
X *    12-nov-86
X *    - added goto-matching-fence (M-^F) command to jump to a matching
X *      fence "({[]})" or beep if there is none. This can reframe the
X *      screen.
X *    - added code and structure elements to support change-screen-size
X *      command (M-^S) to change the number of lines being used by
X *      MicroEMACS.
X *    15-nov-86
X *    - finished debugging change-screen-size
X *    17-nov-86
X *    - Incorporated in James Turner's modifications for the Atari ST
X *        23-sep-86
X *        - added support for the Atari ST line of computers (jmt)
X *          - added a '\r' to the end of each line on output and strip
X *            it on input for the SHOW function from the desktop
X *          - added 3 new mode functions (HIREZ, MEDREZ, and LOREZ);
X *            chgrez routine in TERM structure; and MULTREZ define in
X *            ESTRUCT.H to handle multiple screen resolutions
X *    [note....ST still not running under Lattice yet...]
X *    25-nov-86
X *    - Made the filter-buffer (^X-#) command not work on VIEW mode
X *      buffers
X *    - Made the quick-exit (M-Z) command throw out a newline after
X *      each message so they could be seen.
X *    26-nov-86
X *    - fixed a couple of bugs in change-screen-size (M-^S) command
X *    - changed file read behavior on long lines and last lines
X *      with no newline (it no longer throws the partial line out)
X *    - [as suggested by Dave Tweten] Made adding a ^Z to the end
X *      of an output file under MSDOS configurable under the
X *      CTRL-Z symbol in ESTRUCT.H
X *    - [Dave Tweten] Spawn will look up the "TMP" environment variable
X *      for use during various pipeing commands.
X *    - [Dave Tweten] changed pipe command under MSDOS to use '>>'
X *      instead of '>'
X *    04-dec-86
X *    - moved processing of '@' and '#' so that they can be outside
X *      the quotes in an argument, and added hooks to process '%' for
X *      environment and user variables.
X *    - modified IBMPC.C to sense the graphics adapter (CGA and MONO)
X *      at runtime to cut down on the number of versions.
X *    05-dec-86
X *    - changed macro directive character to "!" instead of "$" (see
X *      below) and fixed the standard .rc file to comply.
X *    - added code to interpret environment variables ($vars). Added
X *      hooks for built in functions (&func). So, to recap:
X *
X *        @<string>    prompt and return a string from the user
X *        #<buffer name>    get the next line from a buffer and advance
X *        %<var>        get user variable <var>
X *        $<evar>        get environment variable <evar>
X *        &<func>        evaluate function <func>
X *
X *    - allowed repeat counts to be any of the above
X *    - added code to allow insert-string (unbound) to use its
X *      repeat count properly
X *    - added set (^X-A) command to set variables. Only works on
X *      environmental vars yet.
X *    9-dec-86
X *    - added some code for user defined variables...more to come
X *    - added options for malloc() memory pool tracking
X *    - preliminary user variables (%) working
X *    - changed terminal calls to macro's (to prepare for the new
X *      terminal drivers)
X *    15-dec-86
X *    - changed previous-line (^P) and next-line (^N) to return a
X *      FALSE at the end or beginning of the file so repeated
X *      macros involving them terminate properly!
X *    - added code for $CURCOL and $CURLINE
X *    20-dec-86
X *    - set (^X-A) now works with all vars
X *    - added some new functions
X *          &ADD &SUB &TIMES &DIV &MOD &NEG &CAT
X *    - once again rearranged functions to control macro execution. Did
X *      away with getarg()
X *    23-dec-86
X *    - added string functions
X *          &LEFt &RIGht &MID
X *    31-dec-86
X *    - added many logical functions
X *          &NOT &EQUal &LESs &GREater
X *    - added string functions
X *          &SEQual &SLEss &SGReater
X *    - added variable indirection with &INDirect
X *    - made fixes to allow recursive macro executions
X *      (improved speed during macro execution as well)
X *    3-jan-87
X *    - added $FLICKER to control flicker supression
X *    - made spawn commands restricted
X *    - cleaned up lots of unintentional int<->char problems
X *    4-jan-87
X *    - Fixed broken pipe-command (^X-@) command under MSDOS
X *    - added !IF  !ELSE  !ENDIF  directives and changed the
X *      name of !END to !ENDM....real slick stuff
X *    5-jan-87
X *    - quick-exit (M-Z) aborts on any filewrite errors
X *    8-jan-87
X *    - debugged a lot of the new directive and evaluation code.
X *      BEWARE of stack space overflows! (increasing stack to
X *      16K under MSDOS)
X *    - removed non-standard DEC Rainbow keyboard support...let someone
X *      PLEASE implement this in the standard manner using key bindings
X *      and send the results to me.
X *    - added change-screen-width () command and $CURWIDTH variable
X *    11-jan-87
X *    - fixed an incredibly deeply buried bug in vtputc and combined
X *      it with vtpute (saving about 200 bytes!)
X *    16-jan-87
X *    - added code to handle controlling multiple screen resolutions...
X *      allowed the IBM-PC driver to force Mono or CGA modes.
X *    - added current buffer name and filename variables
X *      $cbufname and $cfname
X *    18-jan-87
X *    - added $sres variable to control screen resolution
X *    - added $debug variable to control macro debugging code (no longer
X *      is this activated by GLOBAL spell mode)
X *    - fixed bug in -g command line option
X *    - Released Version 3.8 to BBSNET
X *    21-jan-87
X *    - added $status variable to record return status of last command
X *    2-feb-87
X *    - added ATARI 1040 support...runs in all three modes right now
X *    - added $palette var with palette value in it
X *    - undefined "register" in BIND.C and INPUT.C for ST520 & LATTICE
X *      to get around a nasty Lattice bug
X *    4-feb-87
X *    - added, debugged code for switching all 1040ST color modes, added
X *      code for HIGH monochrome mode as well, DENSE still pending
X *    5-feb-87
X *    - with John Gamble, found and corrected the infamous bad matching
X *      fence problems.
X *    - added error return check in various add/delete mode commands
X *    10-feb-87
X *    - re-arrange code in docmd() so that labels are stored in
X *      macro buffers
X *    - fixed !RETURN to only return if (execlevel == 0) [If we are
X *      currently executing]
X *    14-feb-87
X *    - added to outp() calls in the EGA driver to fix a bug in the BIOS
X *    - adding code for 1040ST 40 line DENSE mode (not complete)
X *    25-feb-87
X *    - added auto-save "ASAVE" mode....variables $asave and $acount
X *      control the frequency of saving and count until next save
X *    - added &and and &or as functions for logical anding and oring
X *    - added string length &LEN, upper and lower case string funtions
X *      &LOWER and &UPPER
X *    27-feb-87
X *    - added $lastkey   last keystroke struck and
X *            $curchar    character under cursor
X *    28-feb-87
X *    - added code for trim-line (^X^T) command and table entries
X *      for the entab-line (^X^E) and detab-line (^X^D) commands.
X *      These are conditional on AEDIT (Advanced editing) in estruct.h
X *    18-mar-87
X *    - finished above three commands
X *    - added $version environment variable to return the current
X *      MicroEMACS version number
X *    - added $discmd emvironment variable. This is a logical flag that
X *      indicates if emacs should be echoing commands on the command line.
X *      real useful in order to stop flashing macros and .rc files
X *    - added $progname environment variable. this always returns the
X *      string "MicroEMACS". OEM's should change this so that macros can
X *      tell if they are running on an unmodified emacs or not.
X *    - fixed a minor bug in the CGA/MONO detection routine in IBMPC.C
X *    20-mar-87
X *    - integrated EGAPC.C into IBMPC.C and eliminated the file. Now an
X *      EGA user can switch from EGA to CGA modes at will
X *    - A LOT of little fixes and corrections sent in by John Ruply
X *    25-mar-87
X *    - Fixed buffer variables so they will work when referencing the
X *      current buffer
X *    26-mar-87
X *    - Fixed atoi() to be more reasonable. trailing whitespace ignored,
X *      only one leading sign, no non-digits allowed after the sign.
X *    - fixed buffer variables to go from the point to the end of
X *      line.
X *    28-mar-87
X *    - fixed bugs with 8 bit chars as submited by Jari Salminen
X *    - replace AZTEC/MSDOS agetc() with a1getc() which won't strip
X *      the high order bit
X *    30-mar-87
X *    - changed list-buffers (^X^B) so that with any argument, it will
X *      also list the normally invisable buffers
X *    - added store-procedure and execute-procedure/run (M-^E)
X *      commands to store and execute named procedures.
X *    31-mar-87
X *    - Fixed infinite loop in ^X-X command (when [LIST] is the
X *      only buffer left) as pointed out by John Maline
X *    - made filenames in getfile() always lower case as pointed
X *      out by John Maline
X *    2-apr-87
X *    - Fixed buffer variables so they would work on non-current displayed
X *      buffers. They should now work with ALL buffers....
X *    3-apr-87
X *    - Yanked AZTEC profiling code....not very useful
X *    - Modified IBMPC driver so it will not start in EGA mode
X *    - allow the next-buffer (^X-X) command to have a preceding
X *      non-negative argument.
X *    14-apr-87
X *    - added John Gamble's modified search.c. The code has cut apx
X *      200-300 bytes off the executable.
X *    - added the &RND function to generate a random integer between
X *      1 and its arguments value. Also $SEED is availible as the
X *      random number seed.
X *    - changed the -k command line switch so if there is no argument,
X *      it will prompt for one when the file is read
X *    15-apr-87
X *    - added 20 bytes of buffer in getval()'s local argument alloc so
X *      when it returns a value, it has enough stack space to do at least
X *      one strcpy() before stomping on the returned value. ALWAYS call
X *      getval() ONLY from within a strcpy() call.
X *    - made $curcol return a 1 based value instead of a zero based one.
X *      [changed this back later for 3.8o   it was simply wrong.....]
X *    16-apr-87
X *    - re-wrote strncpy() for AZTEC & MSDOS so it null terminates the
X *      string.
X *    - changed pipe() to pipecmd() to avoid conflicts with various
X *      UNIX systems
X *    24-apr-87
X *    - changed open parameters on AMIGA window open to 0/0/640/200
X *    [Froze and released v3.8i via BBS net]
X *    14-may-87
X *    - added nop (M-FNC) that gets called on every command loop
X *    - added $wline, returns and sets # lines in current window
X *    - added $cwline, returns and set current line within window
X *    - added $target, returns/sets target for line moves
X *    - added $search, returns/sets default search string
X *    - added $replace, returns/sets default replace string
X *    - added $match, returns last matched string in magic search
X *    29-may-87
X *    - rewrote word deletes to not kill trailing non-whitespace after
X *      the last word. Also a zero argument will cause it to just delete
X *      the word and nothing else.
X *    - more fixes for the search pattern environment variables
X *    30-may-87
X *    - forced all windows to redraw on a width change
X *    2-jun-87
X *    - forced clear-message-line to overide $discmd
X *    - added mlforce() routine and call it in clear-message-line,
X *      write-message and when $debug is TRUE
X *    - recoded the startup sequence in main()....Much Better...
X *    4-jun-87
X *    - forced interactive arguments ( @"question" ) to ALWAYS be echoed
X *      regardless of the setting of $discmd.
X *    7-jun-87
X *    - started adding support for Turbo C under MSDOS
X *    11-jun-87
X *    - words now include ONLY upper/lower case alphas and digits
X *    - fixed some more bugs with the startup..(ORed in the global modes)
X *    - took more limits off the self-insert list....
X *    16-jun-87
X *    - macro debugging now displays the name of the current macro.
X *    - fixed a problem in expandp() in search.c that kept high-byte
X *      characters from working in search strings
X *    18-jun-87
X *    - added &sindex <str1> <str2> function which searches for string 2
X *      within string 1
X *    [released verion 3.8o internally]
X *    19-jun-87
X *    - added $cmode and $gmode to return and set the mode of the
X *      current buffer and the global mode
X *    - separated findvar() out from setvar() so it could be used in
X *      the !LOOP directive (which got canned....read on)
X *    - %No such variable message now types the name of the offending
X *      variable
X *    22-jun-87
X *    - fixed startup bug when editing the startup file
X *    - added the !LOOP <var> <label> directive
X *    26-jun-87
X *    - dumped !LOOP......added !WHILE. This needed and caused a vaste
X *      reorginization in exec.c which mainly involved moving all the
X *      directive handling from docmd() to dobuf(), in the process
X *      getting rid of a lot of junk and making the result smaller
X *      than it started.....(yea!)
X *    - added $tpause to control the fence flashing time in CMODE.
X *      The value is machine dependant, but you can multiply the
X *      original in macros to stay machine independant. (as
X *      suggested by Baron O.A. Grey)
X *    - added hook to execute M-FNR (null) during a file read, after
X *      the name is set and right before the file is read. Took out
X *      any auto-CMODE code, as this is now handled with a macro.
X *      (also suggested by Baron O.A. Grey)
X *    - Added Baron O.A. Grey's SYSTEM V typeahead() code...I hope
X *      this works....if you check this out, drop me a line.
X *    - Added new variable $pending, returns a logical telling if
X *      a typed ahead character is pending.
X *    29-jun-87
X *    - Made adjustmode() use curbp-> instead of curwp->w_bufp-> which
X *      fixed some bugs in the startup routines.
X *    - added $lwidth to return the length of the current line
X *    2-jul-87
X *    - Added &env <str> which returns the value of the environment
X *      variable <str> where possible
X *    - Fixed a NASTY bug in execbuf()..the buffer for the name
X *      of the buffer to execute was NBUFN long, and got overflowed
X *      with a long interactive argument.
X *    3-jul-87
X *    - Moved the loop to match a key against its binding out of execute()
X *      to getbind() so it could be used later elsewhere.
X *    - Added &bind <keyname> which returns the function bound to the
X *      named key
X *    - changed execute-file to look in the executable path first...
X *    6-jul-87
X *    - changed $curchar to return a newline at the end of a line and
X *      it no longer advances the cursor
X *    - a lot of minor changes sent by various people....
X *    7-jul-87
X *    - some amiga specific fixes as suggested by Kenn Barry
X *    - added $line [read/write] that contains the current line in the
X *      current buffer
X *    - changed $curcol so setting it beyond the end of the line will
X *      move the cursor to the end of the line and then fail.
X *    10-jul-87
X *    - added a number of fixes and optimizations along with the rest
X *      of the TURBO-C support as submited by John Maline
X *    13-jun-87
X *    - caused dobuf() to copy lastflag to thisflag so the first
X *      command executed will inherit the lastflag from the command
X *      before the execute-buffer command. (needed this for smooth
X *      scrolling to work)
X *    - made flook() look first in the $HOME directory, then in the
X *      current directory, then down the $PATH, and then in the
X *      list in epath.h
X *    14-jul-87
X *    - added some fixes for VMS along with support for the SMG
X *      screen package as submited by Curtis Smith
X *    15-jul-87
X *    - fixed M-^H (delete-previous-word) so it can delete the first
X *      word in a file....I think there may be more of this kind of thing
X *      to fix.
X *    16-jul-87
X *    - added code to allow arbitrary sized lines to be read from files..
X *      speed up file reading in the process.
X *    - made out of memory conditions safer.. especial on file reads
X *    - fixed a bug in bind having to do with uppercasing function
X *      key names (submitted by Jari Salminen)
X *    - made ST520 exit in the same resolution that EMACS was started in
X *      (for the 1040ST)
X *    [FROZE development and released version 3.9 to USENET]
X *    {It never made it.....got killed by comp.unix.sources}
X *    15-sep-87
X *    - added support for Mark Williams C on the Atari ST
X *    - made the MALLOC debugging package only conditional on RAMSIZE
X *    - added code for flagging truncated buffers
X *    23-sep-87
X *    - fixed &RIGHT to return the <arg2> rightmost characters
X *    - fixed a buffer in getval() to be static....things are stabler
X *      now.
X *    - moved all the stack size declarations to after include "estruct.h"
X *      they work a lot better now....... (rather than not at all)
X *    - made Atari ST spawns all work with MWshell
X *    - fixed spawning on the 1040ST under MWC
X *    27-sep-87
X *    - added &exist function to check to see if a named file exist
X *    - added &find function to find a file along the PATH
X *    - added -A switch to run "error.cmd" from command line
X *    - added $gflags to control startup behavior....
X *    03-oct-87
X *    - changed ":c\" to "c:" in epath.h for the AMIGA as suggested
X *      by Tom Edds
X *    - added binary and, or, and xor functions as submited by John Maline
X *      (&band   &bor    and  &bxor)
X *    - added binary not (&bnot) function
X *    - added fixes for gotoline() and nextarg() as submited by David
X *      Dermott
X *    - fixed return value of $curwidth as submitted by David Dermott
X *    - fixed several calls to ldelete() to have a long first argument
X *      (pointed out by David Dermott)
X *    - Fixed a bug in stock() which prevented uppercase FN bindings as
X *      pointed out by many people
X *    - changed dofile() to make sure all executed files don't conflict
X *      with existing buffer names. Took out cludged code in main.c to
X *      handle this problem... this solution is better (suggested by
X *      Don Nash)
X *    05-oct-87
X *    - added in John Gamble's code to allow for a replacement regular
X *      expresion character in MAGIC mode
X *    [note: under MSDOS  we are still TOO BIG!!!!]
X *    - added overwrite-string as a new user callable function, and
X *      lowrite(c) as an internal function for overwriting characters
X *    - added &xlate function to translate strings according to a
X *      translation table
X *    10-oct-87
X *    - added code to allow emacs to clean its own buffers on exit.
X *      useful if emacs is used as a subprogram. Conditional on
X *      the CLEAN definition in estruct.h
X *    14-oct-87
X *    - swallowed very hard and switched to LARGE code/LARGE data model
X *    - packaged and released version 3.9c internally
X *      (MSDOS executables compiled with TURBO C Large model)
X *    16-oct-87
X *    - temporary fix for FUNCTION keys now includes the Meta-O sequence
X *      if VT100 is definined (submited by Jeff Lomicka)
X *    - an VT100 also triggers input.c to force ESC to always
X *      be interpeted as META as well as the currently bound key
X *    - fixed a bug in the VMSVT driver as pointed out by Dave Dermott
X *    - added a size parameter to token() to eliminate problems with
X *      long variable names. (as sugested by Ray Wallace)
X *    18-oct-87
X *    - fixed a bug in the free ram code that did not clear the buffer
X *      flag causing emacs to ask for more confirnmations on the way out.
X *    19-oct-87
X *    - added ^X-$ execute-program call to directly execute a program
X *      without going through a shell... not all environments have this
X *      code completed yet (uses shell-command where not)
X *    [Froze for 3.9d release internally]
X *    28-oct-87
X *    - added code for Atari ST DENSE mode and new bell as submited
X *      by J. C. Benoist
X *    - made extra CR for ST files conditional on ADDCR. This is only
X *      needed to make the desktop happy...and is painful for porting
X *      files (with 2 CR's) elsewhere (Also from J. C. Benoist)
X *    - added optional more intellegent (and larger) close brace
X *      insertion code (also from J. C. Benoist)
X *    4-nov-87
X *    - fixed AZTEC spawning... all MSDOS spawns should work now
X *    - a META key while debugging will turn $debug to false
X *      and continue execution.
X *    [Froze for version 3.9e USENET release]
X */
X
X#include        <stdio.h>
X
X/* make global definitions not external */
X#define    maindef
X
X#include        "estruct.h"    /* global structures and defines */
X#include    "efunc.h"    /* function declarations and name table    */
X#include    "edef.h"    /* global definitions */
X#include    "ebind.h"    /* default key bindings */
X
X/* for MSDOS, increase the default stack space */
X
X#if    MSDOS & LATTICE
Xunsigned _stack = 32766;
X#endif
X
X#if    ATARI & MWC
Xlong _stksize = 32766L;        /* reset stack size (must be even) */
X#endif
X
X#if    MSDOS & AZTEC
Xint _STKSIZ = 32766/16;        /* stack size in paragraphs */
Xint _STKRED = 1024;        /* stack checking limit */
Xint _HEAPSIZ = 4096/16;        /* (in paragraphs) */
Xint _STKLOW = 0;        /* default is stack above heap (small only) */
X#endif
X
X#if    MSDOS & TURBO
Xextern unsigned _stklen = 32766;
X#endif
X
X#if     VMS
X#include        <ssdef.h>
X#define GOOD    (SS$_NORMAL)
X#endif
X
X#ifndef GOOD
X#define GOOD    0
X#endif
X
X#if    CALLED
Xemacs(argc, argv)
X#else
Xmain(argc, argv)
X#endif
Xint argc;    /* # of arguments */
Xchar *argv[];    /* argument strings */
X
X{
X        register int    c;        /* command character */
X        register int    f;        /* default flag */
X        register int    n;        /* numeric repeat count */
X        register int    mflag;        /* negative flag on repeat */
X    register BUFFER *bp;        /* temp buffer pointer */
X    register int    firstfile;    /* first file flag */
X    register int    carg;        /* current arg to scan */
X    register int    startflag;    /* startup executed flag */
X    BUFFER *firstbp = NULL;        /* ptr to first buffer in cmd line */
X    int basec;            /* c stripped of meta character */
X    int viewflag;            /* are we starting in view mode? */
X        int gotoflag;                   /* do we need to goto a line at start? */
X        int gline;                      /* if so, what line? */
X        int searchflag;                 /* Do we need to search at start? */
X    int saveflag;            /* temp store for lastflag */
X    int errflag;            /* C error processing? */
X        char bname[NBUFN];        /* buffer name of file to read */
X#if    CRYPT
X    int cryptflag;            /* encrypting on the way in? */
X    char ekey[NPAT];        /* startup encryption key */
X#endif
X    char *strncpy();
X    extern *pathname[];        /* startup file path/name array */
X
X    /* initialize the editor */
X        vtinit();        /* Display */
X        edinit("main");        /* Buffers, windows */
X    varinit();        /* user variables */
X
X    viewflag = FALSE;    /* view mode defaults off in command line */
X    gotoflag = FALSE;    /* set to off to begin with */
X    searchflag = FALSE;    /* set to off to begin with */
X    firstfile = TRUE;    /* no file to edit yet */
X    startflag = FALSE;    /* startup file not executed yet */
X    errflag = FALSE;    /* not doing C error parsing */
X#if    CRYPT
X    cryptflag = FALSE;    /* no encryption by default */
X#endif
X#if    CALLED
X    eexitflag = FALSE;    /* not time to exit yet */
X#endif
X
X    /* Parse the command line */
X    for (carg = 1; carg < argc; ++carg) {
X
X        /* Process Switches */
X        if (argv[carg][0] == '-') {
X            switch (argv[carg][1]) {
X                /* Process Startup macroes */
X                case 'a':    /* process error file */
X                case 'A':
X                    errflag = TRUE;
X                    break;
X                case 'e':    /* -e for Edit file */
X                case 'E':
X                    viewflag = FALSE;
X                    break;
X                case 'g':    /* -g for initial goto */
X                case 'G':
X                    gotoflag = TRUE;
X                    gline = atoi(&argv[carg][2]);
X                    break;
X#if    CRYPT
X                case 'k':    /* -k<key> for code key */
X                case 'K':
X                    cryptflag = TRUE;
X                    strcpy(ekey, &argv[carg][2]);
X                    break;
X#endif
X                case 'r':    /* -r restrictive use */
X                case 'R':
X                    restflag = TRUE;
X                    break;
X                case 's':    /* -s for initial search string */
X                case 'S':
X                    searchflag = TRUE;
X                    strncpy(pat,&argv[carg][2],NPAT);
X                    break;
X                case 'v':    /* -v for View File */
X                case 'V':
X                    viewflag = TRUE;
X                    break;
X                default:    /* unknown switch */
X                    /* ignore this for now */
X                    break;
X            }
X
X        } else if (argv[carg][0]== '@') {
X
X            /* Process Startup macroes */
X            if (startup(&argv[carg][1]) == TRUE)
X                /* don't execute emacs.rc */
X                startflag = TRUE;
X
X        } else {
X
X            /* Process an input file */
X
X            /* set up a buffer for this file */
X                    makename(bname, argv[carg]);
X            unqname(bname);
X
X            /* set this to inactive */
X            bp = bfind(bname, TRUE, 0);
X            strcpy(bp->b_fname, argv[carg]);
X            bp->b_active = FALSE;
X            if (firstfile) {
X                firstbp = bp;
X                firstfile = FALSE;
X            }
X
X            /* set the modes appropriatly */
X            if (viewflag)
X                bp->b_mode |= MDVIEW;
X#if    CRYPT
X            if (cryptflag) {
X                bp->b_mode |= MDCRYPT;
X                crypt((char *)NULL, 0);
X                crypt(ekey, strlen(ekey));
X                strncpy(bp->b_key, ekey, NPAT);
X            }
X#endif
X        }
X    }
X
X    /* if we are C error parsing... run it! */
X    if (errflag) {
X        if (startup("error.cmd") == TRUE)
X            startflag = TRUE;
X    }
X
X    /* if invoked with no other startup files,
X       run the system startup file here */
X    if (startflag == FALSE) {
X        startup("");
X        startflag = TRUE;
X    }
X
X    /* if there are any files to read, read the first one! */
X    bp = bfind("main", FALSE, 0);
X    if (firstfile == FALSE && (gflags & GFREAD)) {
X        swbuffer(firstbp);
X        curbp->b_mode |= gmode;
X        zotbuf(bp);
X    } else
X        bp->b_mode |= gmode;
X
X        /* Deal with startup gotos and searches */
X        if (gotoflag && searchflag) {
X            update(FALSE);
X        mlwrite("[Can not search and goto at the same time!]");
X    }
X        else if (gotoflag) {
X                if (gotoline(TRUE,gline) == FALSE) {
X                    update(FALSE);
X            mlwrite("[Bogus goto argument]");
X        }
X        } else if (searchflag) {
X                if (forwhunt(FALSE, 0) == FALSE)
X                    update(FALSE);
X        }
X
X    /* setup to process commands */
X        lastflag = 0;                           /* Fake last flags.     */
X
Xloop:
X
X#if    CALLED
X    /* if we were called as a subroutine and want to leave, do so */
X    if (eexitflag)
X        return(eexitval);
X#endif
X
X    /* execute the "command" macro...normally null */
X    saveflag = lastflag;    /* preserve lastflag through this */
X    execute(META|SPEC|'C', FALSE, 1);
X    lastflag = saveflag;
X
X    /* Fix up the screen    */
X        update(FALSE);
X
X    /* get the next command from the keyboard */
X    c = getcmd();
X
X    /* if there is something on the command line, clear it */
X        if (mpresf != FALSE) {
X                mlerase();
X                update(FALSE);
X#if    CLRMSG
X                if (c == ' ')                   /* ITS EMACS does this  */
X                        goto loop;
X#endif
X        }
X        f = FALSE;
X        n = 1;
X
X    /* do META-# processing if needed */
X
X    basec = c & ~META;        /* strip meta char off if there */
X    if ((c & META) && ((basec >= '0' && basec <= '9') || basec == '-')) {
X        f = TRUE;        /* there is a # arg */
X        n = 0;            /* start with a zero default */
X        mflag = 1;        /* current minus flag */
X        c = basec;        /* strip the META */
X        while ((c >= '0' && c <= '9') || (c == '-')) {
X            if (c == '-') {
X                /* already hit a minus or digit? */
X                if ((mflag == -1) || (n != 0))
X                    break;
X                mflag = -1;
X            } else {
X                n = n * 10 + (c - '0');
X            }
X            if ((n == 0) && (mflag == -1))    /* lonely - */
X                mlwrite("Arg:");
X            else
X                mlwrite("Arg: %d",n * mflag);
X
X            c = getcmd();    /* get the next key */
X        }
X        n = n * mflag;    /* figure in the sign */
X    }
X
X    /* do ^U repeat argument processing */
X
X        if (c == reptc) {                  /* ^U, start argument   */
X                f = TRUE;
X                n = 4;                          /* with argument of 4 */
X                mflag = 0;                      /* that can be discarded. */
X                mlwrite("Arg: 4");
X                while ((c=getcmd()) >='0' && c<='9' || c==reptc || c=='-'){
X                        if (c == reptc)
X                if ((n > 0) == ((n*4) > 0))
X                                    n = n*4;
X                            else
X                                n = 1;
X                        /*
X                         * If dash, and start of argument string, set arg.
X                         * to -1.  Otherwise, insert it.
X                         */
X                        else if (c == '-') {
X                                if (mflag)
X                                        break;
X                                n = 0;
X                                mflag = -1;
X                        }
X                        /*
X                         * If first digit entered, replace previous argument
X                         * with digit and set sign.  Otherwise, append to arg.
X                         */
X                        else {
X                                if (!mflag) {
X                                        n = 0;
X                                        mflag = 1;
X                                }
X                                n = 10*n + c - '0';
X                        }
X                        mlwrite("Arg: %d", (mflag >=0) ? n : (n ? -n : -1));
X                }
X                /*
X                 * Make arguments preceded by a minus sign negative and change
X                 * the special argument "^U -" to an effective "^U -1".
X                 */
X                if (mflag == -1) {
X                        if (n == 0)
X                                n++;
X                        n = -n;
X                }
X        }
X
X    /* and execute the command */
X        execute(c, f, n);
X        goto loop;
X}
X
X/*
X * Initialize all of the buffers and windows. The buffer name is passed down
X * as an argument, because the main routine may have been told to read in a
X * file by default, and we want the buffer name to be right.
X */
Xedinit(bname)
Xchar    bname[];
X{
X        register BUFFER *bp;
X        register WINDOW *wp;
X    char *malloc();
X
X        bp = bfind(bname, TRUE, 0);             /* First buffer         */
X        blistp = bfind("[List]", TRUE, BFINVS); /* Buffer list buffer   */
X        wp = (WINDOW *) malloc(sizeof(WINDOW)); /* First window         */
X        if (bp==NULL || wp==NULL || blistp==NULL)
X                exit(1);
X        curbp  = bp;                            /* Make this current    */
X        wheadp = wp;
X        curwp  = wp;
X        wp->w_wndp  = NULL;                     /* Initialize window    */
X        wp->w_bufp  = bp;
X        bp->b_nwnd  = 1;                        /* Displayed.           */
X        wp->w_linep = bp->b_linep;
X        wp->w_dotp  = bp->b_linep;
X        wp->w_doto  = 0;
X        wp->w_markp = NULL;
X        wp->w_marko = 0;
X        wp->w_toprow = 0;
X#if    COLOR
X    /* initalize colors to global defaults */
X    wp->w_fcolor = gfcolor;
X    wp->w_bcolor = gbcolor;
X#endif
X        wp->w_ntrows = term.t_nrow-1;           /* "-1" for mode line.  */
X        wp->w_force = 0;
X        wp->w_flag  = WFMODE|WFHARD;            /* Full.                */
X}
X
X/*
X * This is the general command execution routine. It handles the fake binding
X * of all the keys to "self-insert". It also clears out the "thisflag" word,
X * and arranges to move it to the "lastflag", so that the next command can
X * look at it. Return the status of command.
X */
Xexecute(c, f, n)
X{
X        register int status;
X    int (*execfunc)();        /* ptr to function to execute */
X    int (*getbind())();
X
X    /* if the keystroke is a bound function...do it */
X    execfunc = getbind(c);
X        if (execfunc != NULL) {
X        thisflag = 0;
X        status     = (*execfunc)(f, n);
X        lastflag = thisflag;
X        return (status);
X        }
X
X        /*
X         * If a space was typed, fill column is defined, the argument is non-
X         * negative, wrap mode is enabled, and we are now past fill column,
X     * and we are not read-only, perform word wrap.
X         */
X        if (c == ' ' && (curwp->w_bufp->b_mode & MDWRAP) && fillcol > 0 &&
X        n >= 0 && getccol(FALSE) > fillcol &&
X        (curwp->w_bufp->b_mode & MDVIEW) == FALSE)
X        execute(META|SPEC|'W', FALSE, 1);
X
X        if ((c>=0x20 && c<=0xFF)) {    /* Self inserting.      */
X                if (n <= 0) {                   /* Fenceposts.          */
X                        lastflag = 0;
X                        return (n<0 ? FALSE : TRUE);
X                }
X                thisflag = 0;                   /* For the future.      */
X
X        /* if we are in overwrite mode, not at eol,
X           and next char is not a tab or we are at a tab stop,
X           delete a char forword            */
X        if (curwp->w_bufp->b_mode & MDOVER &&
X            curwp->w_doto < curwp->w_dotp->l_used &&
X            (lgetc(curwp->w_dotp, curwp->w_doto) != '\t' ||
X             (curwp->w_doto) % 8 == 7))
X                ldelete(1L, FALSE);
X
X        /* do the appropriate insertion */
X        if (c == '}' && (curbp->b_mode & MDCMOD) != 0)
X                status = insbrace(n, c);
X            else if (c == '#' && (curbp->b_mode & MDCMOD) != 0)
X                status = inspound();
X            else
X                    status = linsert(n, c);
X
X#if    CFENCE
X        /* check for CMODE fence matching */
X        if ((c == '}' || c == ')' || c == ']') &&
X                (curbp->b_mode & MDCMOD) != 0)
X            fmatch(c);
X#endif
X
X        /* check auto-save mode */
X        if (curbp->b_mode & MDASAVE)
X            if (--gacount == 0) {
X                /* and save the file if needed */
X                upscreen(FALSE, 0);
X                filesave(FALSE, 0);
X                gacount = gasave;
X            }
X
X                lastflag = thisflag;
X                return (status);
X        }
X    TTbeep();
X    mlwrite("[Key not bound]");        /* complain        */
X        lastflag = 0;                           /* Fake last flags.     */
X        return (FALSE);
X}
X
X/*
X * Fancy quit command, as implemented by Norm. If the any buffer has
X * changed do a write on that buffer and exit emacs, otherwise simply exit.
X */
Xquickexit(f, n)
X{
X    register BUFFER *bp;    /* scanning pointer to buffers */
X        register BUFFER *oldcb; /* original current buffer */
X    register int status;
X
X        oldcb = curbp;                          /* save in case we fail */
X
X    bp = bheadp;
X    while (bp != NULL) {
X            if ((bp->b_flag&BFCHG) != 0    /* Changed.             */
X            && (bp->b_flag&BFINVS) == 0) {    /* Real.                */
X            curbp = bp;        /* make that buffer cur    */
X            mlwrite("[Saving %s]",bp->b_fname);
X            mlwrite("\n");
X                    if ((status = filesave(f, n)) != TRUE) {
X                        curbp = oldcb;    /* restore curbp */
X                        return(status);
X                    }
X        }
X    bp = bp->b_bufp;            /* on to the next buffer */
X    }
X        quit(f, n);                             /* conditionally quit   */
X    return(TRUE);
X}
X
X/*
X * Quit command. If an argument, always quit. Otherwise confirm if a buffer
X * has been changed and not written out. Normally bound to "C-X C-C".
X */
Xquit(f, n)
X{
X        register int    s;
X
X        if (f != FALSE                          /* Argument forces it.  */
X        || anycb() == FALSE                     /* All buffers clean.   */
X                        /* User says it's OK.   */
X        || (s=mlyesno("Modified buffers exist. Leave anyway")) == TRUE) {
X#if    FILOCK
X        if (lockrel() != TRUE) {
X            TTputc('\n');
X            TTputc('\r');
X            TTclose();
X            TTkclose();
X            exit(1);
X        }
X#endif
X                vttidy();
X        if (f)
X            exit(n);
X        else
X                    exit(GOOD);
X        }
X    mlwrite("");
X        return(s);
X}
X
X/*
X * Begin a keyboard macro.
X * Error if not at the top level in keyboard processing. Set up variables and
X * return.
X */
Xctlxlp(f, n)
X{
X        if (kbdmode != STOP) {
X                mlwrite("%%Macro already active");
X                return(FALSE);
X        }
X        mlwrite("[Start macro]");
X    kbdptr = &kbdm[0];
X    kbdend = kbdptr;
X        kbdmode = RECORD;
X        return (TRUE);
X}
X
X/*
X * End keyboard macro. Check for the same limit conditions as the above
X * routine. Set up the variables and return to the caller.
X */
Xctlxrp(f, n)
X{
X        if (kbdmode == STOP) {
X                mlwrite("%%Macro not active");
X                return(FALSE);
X        }
X    if (kbdmode == RECORD) {
X            mlwrite("[End macro]");
X            kbdmode = STOP;
X    }
X        return(TRUE);
X}
X
X/*
X * Execute a macro.
X * The command argument is the number of times to loop. Quit as soon as a
X * command gets an error. Return TRUE if all ok, else FALSE.
X */
Xctlxe(f, n)
X{
X        if (kbdmode != STOP) {
X                mlwrite("%%Macro already active");
X                return(FALSE);
X        }
X        if (n <= 0)
X                return (TRUE);
X    kbdrep = n;        /* remember how many times to execute */
X    kbdmode = PLAY;        /* start us in play mode */
X    kbdptr = &kbdm[0];    /*    at the beginning */
X    return(TRUE);
X}
X
X/*
X * Abort.
X * Beep the beeper. Kill off any keyboard macro, etc., that is in progress.
X * Sometimes called as a routine, to do general aborting of stuff.
X */
Xctrlg(f, n)
X{
X        TTbeep();
X    kbdmode = STOP;
X    mlwrite("[Aborted]");
X        return(ABORT);
X}
X
X/* tell the user that this command is illegal while we are in
X   VIEW (read-only) mode                */
X
Xrdonly()
X
X{
X    TTbeep();
X    mlwrite("[Key illegal in VIEW mode]");
X    return(FALSE);
X}
X
Xresterr()
X
X{
X    TTbeep();
X    mlwrite("[That command is RESTRICTED]");
X    return(FALSE);
X}
X
Xnullproc()    /* user function that does NOTHING */
X
X{
X}
X
Xmeta()    /* dummy function for binding to meta prefix */
X{
X}
X
Xcex()    /* dummy function for binding to control-x prefix */
X{
X}
X
Xunarg()    /* dummy function for binding to universal-argument */
X{
X}
X
X/*****        Compiler specific Library functions    ****/
X
X#if    MWC86 & MSDOS
Xmovmem(source, dest, size)
X
Xchar *source;    /* mem location to move memory from */
Xchar *dest;    /* memory location to move text to */
Xint size;    /* number of bytes to move */
X
X{
X    register int i;
X
X    for (i=0; i < size; i++)
X        *dest++ = *source++;
X}
X#endif
X
X#if    MSDOS | AMIGA | ST520
X/*    strncpy:    copy a string...with length restrictions
X            ALWAYS null terminate
X*/
X
Xchar *strncpy(dst, src, maxlen)
X
Xchar *dst;    /* destination of copied string */
Xchar *src;    /* source */
Xint maxlen;    /* maximum length */
X
X{
X    char *dptr;    /* ptr into dst */
X
X    dptr = dst;
X    while (*src && (maxlen-- > 0))
X        *dptr++ = *src++;
X    *dptr = 0;
X    return(dst);
X}
X#endif
X
X#if    RAMSIZE
X/*    These routines will allow me to track memory usage by placing
X    a layer on top of the standard system malloc() and free() calls.
X    with this code defined, the environment variable, $RAM, will
X    report on the number of bytes allocated via malloc.
X
X    with SHOWRAM defined, the number is also posted on the
X    end of the bottom mode line and is updated whenever it is changed.
X*/
X
X#undef    malloc
X#undef    free
X
Xchar *allocate(nbytes)    /* allocate nbytes and track */
X
Xunsigned nbytes;    /* # of bytes to allocate */
X
X{
X    char *mp;    /* ptr returned from malloc */
X    char *malloc();
X
X    mp = malloc(nbytes);
X    if (mp) {
X        envram += nbytes;
X#if    RAMSHOW
X        dspram();
X#endif
X    }
X
X    return(mp);
X}
X
Xrelease(mp)    /* release malloced memory and track */
X
Xchar *mp;    /* chunk of RAM to release */
X
X{
X    unsigned *lp;    /* ptr to the long containing the block size */
X
X    if (mp) {
X        /* update amount of ram currently malloced */
X        lp = ((unsigned *)mp) - 1;
X        envram -= (long)*lp - 2;
X        free(mp);
X#if    RAMSHOW
X        dspram();
X#endif
X    }
X}
X
X#if    RAMSHOW
Xdspram()    /* display the amount of RAM currently malloced */
X
X{
X    char mbuf[20];
X    char *sp;
X
X    TTmove(term.t_nrow - 1, 70);
X#if    COLOR
X    TTforg(7);
X    TTbacg(0);
X#endif
X    sprintf(mbuf, "[%lu]", envram);
X    sp = &mbuf[0];
X    while (*sp)
X        TTputc(*sp++);
X    TTmove(term.t_nrow, 0);
X    movecursor(term.t_nrow, 0);
X}
X#endif
X#endif
X
X/*    On some primitave operation systems, and when emacs is used as
X    a subprogram to a larger project, emacs needs to de-alloc its
X    own used memory
X*/
X
X#if    CLEAN
Xcexit(status)
X
Xint status;    /* return status of emacs */
X
X{
X    register BUFFER *bp;    /* buffer list pointer */
X    register WINDOW *wp;    /* window list pointer */
X    register WINDOW *tp;    /* temporary window pointer */
X
X    /* first clean up the windows */
X    wp = wheadp;
X    while (wp) {
X        tp = wp->w_wndp;
X        free(wp);
X        wp = tp;
X    }
X    wheadp = NULL;
X
X    /* then the buffers */
X    bp = bheadp;
X    while (bp) {
X        bp->b_nwnd = 0;
X        bp->b_flag = 0;    /* don't say anything about a changed buffer! */
X        zotbuf(bp);
X        bp = bheadp;
X    }
X
X    /* and the kill buffer */
X    kdelete();
X
X    /* and the video buffers */
X    vtfree();
X
X    /* and now.. we leave [pick the return if we are a subprogram] */
X#if    CALLED
X    eexitflag = TRUE;    /* flag a program exit */
X    eexitval = status;
X    return(status);
X#else
X#undef    exit
X    exit(status);
X#endif
X}
X#endif
FRIDAY_NIGHT
echo mes.8 completed!
# That's all folks!