edbasic.c

NASA 开发使用的一个专家系统

{
        register LINE   *flp;
        register LINE   *blp;
        long    fsize;
        long    bsize;

        if (curwp->w_markp == NULL) {
                mlwrite("No mark set in this window");
                return (FALSE);
        }
        if (curwp->w_dotp == curwp->w_markp) {
                rp->r_linep = curwp->w_dotp;
                if (curwp->w_doto < curwp->w_marko) {
                        rp->r_offset = curwp->w_doto;
                        rp->r_size = (long) (curwp->w_marko-curwp->w_doto);
                } else {
                        rp->r_offset = curwp->w_marko;
                        rp->r_size = (long) (curwp->w_doto-curwp->w_marko);
                }
                return (TRUE);
        }
        blp = curwp->w_dotp;
        bsize = (long) curwp->w_doto;
        flp = curwp->w_dotp;
        fsize = (long) (llength(flp)-curwp->w_doto+1);
        while (flp!=curbp->b_linep || lback(blp)!=curbp->b_linep) {
                if (flp != curbp->b_linep) {
                        flp = lforw(flp);
                        if (flp == curwp->w_markp) {
                                rp->r_linep = curwp->w_dotp;
                                rp->r_offset = curwp->w_doto;
                                rp->r_size = fsize+curwp->w_marko;
                                return (TRUE);
                        }
                        fsize += llength(flp)+1;
                }
                if (lback(blp) != curbp->b_linep) {
                        blp = lback(blp);
                        bsize += llength(blp)+1;
                        if (blp == curwp->w_markp) {
                                rp->r_linep = blp;
                                rp->r_offset = curwp->w_marko;
                                rp->r_size = bsize - curwp->w_marko;
                                return (TRUE);
                        }
                }
        }
        mlwrite("Bug: lost mark");
        return (FALSE);
}

/* =======================================================================
 *                   HIGH LEVEL FILE I/O COMMANDS
 * =======================================================================
 */

/*
 * Read a file into the current
 * buffer. This is really easy; all you do it
 * find the name of the file, and call the standard
 * "read a file into the current buffer" code.
 * Bound to "C-X C-R".
 *
 * Changed calling code to "C-X C-V" to be
 * more like the Zmacs editor on Symbolics. CJC 7/28/86
 */
#if IBM_TBC
#pragma argsused
#endif
globle int fileread(f, n)
int f,n;
{
        register int    s;
        char            fname[NFILEN];

        if ((s=mlreply("Visit file: ", fname, NFILEN)) != TRUE)
                return (s);
        return (readin(fname));
}

/*
 * Select a file for editing.
 * Look around to see if you can find the
 * fine in another buffer; if you can find it
 * just switch to the buffer. If you cannot find
 * the file, create a new buffer, read in the
 * text, and switch to the new buffer.
 * Bound to C-X C-V.
 *
 * Changed calling code to "C-X C-F" (Find File) to be
 * more like the Zmacs editor on Symbolics. CJC 7/28/86
 */
#if IBM_TBC
#pragma argsused
#endif
globle int filevisit(f, n)
int f,n;
{
        register int    s;
        char            fname[NFILEN];

        if ((s=mlreply("Find file: ", fname, NFILEN)) != TRUE)
                return (s);
	filevisit_guts(fname);
	return(TRUE);
}

globle int filevisit_guts(fname)
char fname[];
{
        register BUFFER *bp;
        register WINDOW *wp;
        register LINE   *lp;
        register int    i;
        register int    s;
        char            bname[NBUFN];

        for (bp=bheadp; bp!=NULL; bp=bp->b_bufp) {
                if ((bp->b_flag&BFTEMP)==0 && strcmp(bp->b_fname, fname)==0) {
                        if (--curbp->b_nwnd == 0) {
                                curbp->b_dotp  = curwp->w_dotp;
                                curbp->b_doto  = curwp->w_doto;
                                curbp->b_markp = curwp->w_markp;
                                curbp->b_marko = curwp->w_marko;
                        }
                        curbp = bp;
                        curwp->w_bufp  = bp;
                        if (bp->b_nwnd++ == 0) {
                                curwp->w_dotp  = bp->b_dotp;
                                curwp->w_doto  = bp->b_doto;
                                curwp->w_markp = bp->b_markp;
                                curwp->w_marko = bp->b_marko;
                        } else {
                                wp = wheadp;
                                while (wp != NULL) {
                                        if (wp!=curwp && wp->w_bufp==bp) {
                                                curwp->w_dotp  = wp->w_dotp;
                                                curwp->w_doto  = wp->w_doto;
                                                curwp->w_markp = wp->w_markp;
                                                curwp->w_marko = wp->w_marko;
                                                break;
                                        }
                                        wp = wp->w_wndp;
                                }
                        }
                        lp = curwp->w_dotp;
                        i = curwp->w_ntrows/2;
                        while (i-- && lback(lp)!=curbp->b_linep)
                                lp = lback(lp);
                        curwp->w_linep = lp;
                        curwp->w_flag |= WFMODE|WFHARD;
                        mlwrite("[Old buffer]");
                        return (TRUE);
                }
        }
        makename(bname, fname);                 /* New buffer name.     */
        while ((bp=bfind(bname, FALSE, 0)) != NULL) {
                s = mlreply("Buffer name: ", bname, NBUFN);
                if (s == ABORT)                 /* ^G to just quit      */
                        return (s);
                if (s == FALSE) {               /* CR to clobber it     */
                        makename(bname, fname);
                        break;
                }
        }
        if (bp==NULL && (bp=bfind(bname, TRUE, 0))==NULL) {
                mlwrite("Cannot create buffer");
                return (FALSE);
        }
        if (--curbp->b_nwnd == 0) {             /* Undisplay.           */
                curbp->b_dotp = curwp->w_dotp;
                curbp->b_doto = curwp->w_doto;
                curbp->b_markp = curwp->w_markp;
                curbp->b_marko = curwp->w_marko;
        }
        strcpy(lastbufn, curbp->b_bname);       /* Set last buufer name */

        curbp = bp;                             /* Switch to it.        */
        curwp->w_bufp = bp;
        curbp->b_nwnd++;
        return (readin(fname));                 /* Read it in.          */
}

/*
 * Read file "fname" into the current
 * buffer, blowing away any text found there. Called
 * by both the read and visit commands. Return the final
 * status of the read. Also called by the mainline,
 * to read in a file specified on the command line as
 * an argument.
 */
globle int readin(fname)
char    fname[];
{
        register LINE   *lp1;
        register LINE   *lp2;
        register int    i;
        register WINDOW *wp;
        register BUFFER *bp;
        register int    s;
        register int    nbytes;
        register int    nline;
        char            line[NLINE];

        bp = curbp;                             /* Cheap.               */
        if ((s=bclear(bp)) != TRUE)             /* Might be old.        */
                return (s);
        bp->b_flag &= ~(BFTEMP|BFCHG);
        strcpy(bp->b_fname, fname);
        if ((s=ffropen(fname)) == FIOERR)       /* Hard file open.      */
                goto out;
        if (s == FIOFNF) {                      /* File not found.      */
                mlwrite("[New file]");
                goto out;
        }
        mlwrite("[Reading file]");
        nline = 0;
        while ((s=ffgetline(line, NLINE)) == FIOSUC) {
                nbytes = strlen(line);
                if ((lp1=lalloc(nbytes)) == NULL) {
                        s = FIOERR;             /* Keep message on the  */
                        break;                  /* display.             */
                }
                lp2 = lback(curbp->b_linep);
                lp2->l_fp = lp1;
                lp1->l_fp = curbp->b_linep;
                lp1->l_bp = lp2;
                curbp->b_linep->l_bp = lp1;
                for (i=0; i<nbytes; ++i)
                        lputc(lp1, i, line[i]);
                ++nline;
        }
        ffclose();                              /* Ignore errors.       */
        if (s == FIOEOF) {                      /* Don't zap message!   */
                if (nline == 1)
                        mlwrite("[Read 1 line]");
                else
                        mlwrite("[Read %d lines]", nline);
        }
out:
        for (wp=wheadp; wp!=NULL; wp=wp->w_wndp) {
                if (wp->w_bufp == curbp) {
                        wp->w_linep = lforw(curbp->b_linep);
                        wp->w_dotp  = lforw(curbp->b_linep);
                        wp->w_doto  = 0;
                        wp->w_markp = NULL;
                        wp->w_marko = 0;
                        wp->w_flag |= WFMODE|WFHARD;
                }
        }
        if (s == FIOERR)                        /* False if error.      */
                return (FALSE);
        return (TRUE);
}

/*
 * Take a file name, and from it
 * fabricate a buffer name. This routine knows
 * about the syntax of file names on the target system.
 * I suppose that this information could be put in
 * a better place than a line of code.
 */
globle int makename(bname, fname)
char    bname[];
char    fname[];
{
        register char   *cp1;
        register char   *cp2;

        cp1 = &fname[0];
        while (*cp1 != 0)
                ++cp1;

#if     VAX_VMS
        while (cp1!=&fname[0] && cp1[-1]!=':' && cp1[-1]!=']')
                --cp1;
#endif

#if     IBM_MSC || IBM_TBC || IBM_ZTC || IBM_ICB || IBM_SC || IBM_GCC
        while (cp1!=&fname[0] && cp1[-1]!=':' && cp1[-1]!='\\')
                --cp1;
#endif
#if     UNIX_7 || UNIX_V
        while (cp1!=&fname[0] && cp1[-1]!='/')
                --cp1;
#endif
        cp2 = &bname[0];
        while (cp2!=&bname[NBUFN-1] && *cp1!=0 && *cp1!=';')
                *cp2++ = *cp1++;
        *cp2 = 0;
	return(TRUE);
}

/*
 * Ask for a file name, and write the
 * contents of the current buffer to that file.
 * Update the remembered file name and clear the
 * buffer changed flag. This handling of file names
 * is different from the earlier versions, and
 * is more compatable with Gosling EMACS than
 * with ITS EMACS. Bound to "C-X C-W".
 *
 * Modified to allow current file name as default. CJC 7/28/86
 */
#if IBM_TBC
#pragma argsused
#endif
globle int filewrite(f, n)
int f,n;
{
        register WINDOW *wp;
        register int    s;
        char            fname[NFILEN];
        char            prompt[NFILEN + 15];

        sprintf(prompt,"Write file [%s]: ",curbp->b_fname);
        if ((s=mlreply(prompt, fname, NFILEN)) != TRUE) {
                if (s == FALSE)
                   strcpy(fname, curbp->b_fname);
                else
                   return (s);
                }
        if ((s=writeout(fname)) == TRUE) {
                strcpy(curbp->b_fname, fname);
                curbp->b_flag &= ~BFCHG;
                wp = wheadp;                    /* Update mode lines.   */
                while (wp != NULL) {
                        if (wp->w_bufp == curbp)
                                wp->w_flag |= WFMODE;
                        wp = wp->w_wndp;
                }
        }
        return (s);
}

/*
 * Save the contents of the current
 * buffer in its associatd file. Do nothing
 * if nothing has changed (this may be a bug, not a
 * feature). Error if there is no remembered file
 * name for the buffer. Bound to "C-X C-S". May
 * get called by "C-Z".
 */
#if IBM_TBC
#pragma argsused
#endif
globle int filesave(f, n)
int f,n;
{
        register WINDOW *wp;
        register int    s;

        if ((curbp->b_flag&BFCHG) == 0)         /* Return, no changes.  */
                return (TRUE);
        if (curbp->b_fname[0] == 0) {           /* Must have a name.    */
                mlwrite("No file name");
                return (FALSE);
        }
        if ((s=writeout(curbp->b_fname)) == TRUE) {
                curbp->b_flag &= ~BFCHG;
                wp = wheadp;                    /* Update mode lines.   */
                while (wp != NULL) {
                        if (wp->w_bufp == curbp)
                                wp->w_flag |= WFMODE;
                        wp = wp->w_wndp;
                }
        }
        return (s);
}

/*
 * This function performs the details of file
 * writing. Uses the file management routines in the
 * "fileio.c" package. The number of lines written is
 * displayed. Sadly, it looks inside a LINE; provide
 * a macro for this. Most of the grief is error
 * checking of some sort.
 */
globle int writeout(fn)
char    *fn;
{
        register int    s;
        register LINE   *lp;
        register int    nline;

        if ((s=ffwopen(fn)) != FIOSUC)          /* Open writes message. */
                return (FALSE);
        lp = lforw(curbp->b_linep);             /* First line.          */
        nline = 0;                              /* Number of lines.     */
        while (lp != curbp->b_linep) {
                if ((s=ffputline(&lp->l_text[0], llength(lp))) != FIOSUC)
                        break;
                ++nline;
                lp = lforw(lp);
        }
        if (s == FIOSUC) {                      /* No write error.      */
                s = ffclose();
                if (s == FIOSUC) {              /* No close error.      */
                        if (nline == 1)
                                mlwrite("[Wrote 1 line]");
                        else
                                mlwrite("[Wrote %d lines]", nline);
                }
        } else                                  /* Ignore close error   */
                ffclose();                      /* if a write error.    */
        if (s != FIOSUC)                        /* Some sort of error.  */
                return (FALSE);
        return (TRUE);
}

/*
 * The command allows the user
 * to modify the file name associated with
 * the current buffer. It is like the "f" command
 * in UNIX "ed". The operation is simple; just zap
 * the name in the BUFFER structure, and mark the windows
 * as needing an update. You can type a blank line at the
 * prompt if you wish.
 *
 * Bound to "C-X C-R" for Rename buffer!
 * Changed 7/28/86 by CJC.