edstruct.c

NASA 开发使用的一个专家系统

/*   CLIPS Version 6.05  04/09/97 */

#include "setup.h"

#if EMACS_EDITOR && ! RUN_TIME

#define _EDSTRUCT_SOURCE_
#include "ed.h"

#if ANSI_COMPILER
#include <stdarg.h>
#endif

/* ----------------------------
 *   Display management stuff
 * ----------------------------
 */

typedef struct  VIDEO {
        short   v_flag;                 /* Flags */
        char    v_text[1];              /* Screen data. */
}       VIDEO;

#define VFCHG   0x0001                  /* Changed. */

globle int     mpresf  = FALSE;         /* TRUE if message in last line */
globle int     sgarbf  = TRUE;          /* TRUE if screen is garbage */

static int     vtrow   = 0;                    /* Row location of SW cursor */
static int     vtcol   = 0;                    /* Column location of SW cursor */
static int     ttrow   = HUGE;                 /* Row location of HW cursor */
static int     ttcol   = HUGE;                 /* Column location of HW cursor */

static VIDEO  **vscreen;                      /* Virtual screen. */
static VIDEO  **pscreen;                      /* Physical screen. */

/* ----------------------------
 *   Line management stuff
 * ----------------------------
 */

#define NBLOCK  16                      /* Line block chunk size        */
#define KBLOCK  256                     /* Kill buffer block size       */

static char    *kbufp  = NULL;                 /* Kill buffer data             */
static int     kused   = 0;                    /* # of bytes used in KB        */
static int     ksize   = 0;                    /* # of bytes allocated in KB   */

#if ANSI_COMPILER
static VOID int_to_ascii(char [],int,int);
#else
static VOID int_to_ascii();
#endif

/* ==========================================================================
 *                      BUFFER MANAGEMENT FUNCTIONS
 * ==========================================================================
 */

/*
 * Some of the functions in this section are internal, and some are
 * actually attached to user keys. Like everyone else, they set hints
 * for the display system.
 */

/*
 * Attach a buffer to a window. The
 * values of dot and mark come from the buffer
 * if the use count is 0. Otherwise, they come
 * from some other window.
 */
#if IBM_TBC
#pragma argsused
#endif
globle int usebuffer(f, n)
int f,n;
{
        register BUFFER *bp;
        register WINDOW *wp;
        register int    s;
        char            bufn[NBUFN];
        char            prompt[NBUFN + 15];

        sprintf(prompt,"Use buffer [%s]: ",lastbufn);
        if ((s=mlreply(prompt, bufn, NBUFN)) != TRUE) {
                if (( s == FALSE) && (strlen(lastbufn) != 0))
                   strcpy(bufn, lastbufn);
                else
                   return (s);
                }
        if ((bp=bfind(bufn, TRUE, 0)) == NULL)
                return (FALSE);
        strcpy(lastbufn, curbp->b_bname);       /* Save current bufname */
        if (--curbp->b_nwnd == 0) {             /* Last use.            */
                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;                             /* Switch.              */
        curwp->w_bufp  = bp;
        curwp->w_linep = bp->b_linep;           /* For macros, ignored. */
        curwp->w_flag |= WFMODE|WFFORCE|WFHARD; /* Quite nasty.         */
        if (bp->b_nwnd++ == 0) {                /* First use.           */
                curwp->w_dotp  = bp->b_dotp;
                curwp->w_doto  = bp->b_doto;
                curwp->w_markp = bp->b_markp;
                curwp->w_marko = bp->b_marko;
                return (TRUE);
        }
        wp = wheadp;                            /* Look for old.        */
        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;
        }
        return (TRUE);
}

/*
 * Dispose of a buffer, by name.
 * Ask for the name. Look it up (don't get too
 * upset if it isn't there at all!). Get quite upset
 * if the buffer is being displayed. Clear the buffer (ask
 * if the buffer has been changed). Then free the header
 * line and the buffer header. Bound to "C-X K".
 */
#if IBM_TBC
#pragma argsused
#endif
globle int killbuffer(f, n)
int f,n;
{
        register BUFFER *bp;
        register BUFFER *bp1;
        register BUFFER *bp2;
        register int    s;
        char            bufn[NBUFN];

        if ((s=mlreply("Kill buffer: ", bufn, NBUFN)) != TRUE)
                return (s);
        if ((bp=bfind(bufn, FALSE, 0)) == NULL) /* Easy if unknown.     */
                return (TRUE);
        if (bp->b_nwnd != 0) {                  /* Error if on screen.  */
                mlwrite("Buffer is being displayed");
                return (FALSE);
        }
        if ((s=bclear(bp)) != TRUE)             /* Blow text away.      */
                return (s);
        genfree((VOID *) bp->b_linep,(unsigned) (sizeof(LINE) + bp->b_linep->l_size));
        bp1 = NULL;                             /* Find the header.     */
        bp2 = bheadp;
        while (bp2 != bp) {
                bp1 = bp2;
                bp2 = bp2->b_bufp;
        }
        bp2 = bp2->b_bufp;                      /* Next one in chain.   */
        if (bp1 == NULL)                        /* Unlink it.           */
                bheadp = bp2;
        else
                bp1->b_bufp = bp2;
        genfree((VOID *) bp, (unsigned) sizeof(BUFFER));   /* Release buffer block */
        mlwrite("Buffer Killed!");
        return (TRUE);
}

/*
 * List all of the active
 * buffers. First update the special
 * buffer that holds the list. Next make
 * sure at least 1 window is displaying the
 * buffer list, splitting the screen if this
 * is what it takes. Lastly, repaint all of
 * the windows that are displaying the
 * list. Bound to "C-X C-B".
 */
#if IBM_TBC
#pragma argsused
#endif
globle int listbuffers(f, n)
int f,n;
{
        register WINDOW *wp;
        register BUFFER *bp;
        register int    s;

        if ((s=makelist()) != TRUE)
                return (s);
        if (blistp->b_nwnd == 0) {              /* Not on screen yet.   */
                if ((wp=wpopup()) == NULL)
                        return (FALSE);
                bp = wp->w_bufp;
                if (--bp->b_nwnd == 0) {
                        bp->b_dotp  = wp->w_dotp;
                        bp->b_doto  = wp->w_doto;
                        bp->b_markp = wp->w_markp;
                        bp->b_marko = wp->w_marko;
                }
                wp->w_bufp  = blistp;
                ++blistp->b_nwnd;
        }
        wp = wheadp;
        while (wp != NULL) {
                if (wp->w_bufp == blistp) {
                        wp->w_linep = lforw(blistp->b_linep);
                        wp->w_dotp  = lforw(blistp->b_linep);
                        wp->w_doto  = 0;
                        wp->w_markp = NULL;
                        wp->w_marko = 0;
                        wp->w_flag |= WFMODE|WFHARD;
                }
                wp = wp->w_wndp;
        }
        return (TRUE);
}

/*
 * This routine rebuilds the
 * text in the special secret buffer
 * that holds the buffer list. It is called
 * by the list buffers command. Return TRUE
 * if everything works. Return FALSE if there
 * is an error (if there is no memory).
 */
globle int makelist()
{
        register char   *cp1;
        register char   *cp2;
        register int    c;
        register BUFFER *bp;
        register LINE   *lp;
        register int    nbytes;
        register int    s;
        char            b[6+1];
        char            line[128];

        blistp->b_flag &= ~BFCHG;               /* Don't complain!      */
        if ((s=bclear(blistp)) != TRUE)         /* Blow old text away   */
                return (s);
        strcpy(blistp->b_fname, "");
        if (addline(blistp,"C   Size Buffer           File") == FALSE
        ||  addline(blistp,"-   ---- ------           ----") == FALSE)
                return (FALSE);
        bp = bheadp;                            /* For all buffers      */
        while (bp != NULL) {
                if ((bp->b_flag&BFTEMP) != 0) { /* Skip magic ones.     */
                        bp = bp->b_bufp;
                        continue;
                }
                cp1 = &line[0];                 /* Start at left edge   */
                if ((bp->b_flag&BFCHG) != 0)    /* "*" if changed       */
                        *cp1++ = '*';
                else
                        *cp1++ = ' ';
                *cp1++ = ' ';                   /* Gap.                 */
                nbytes = 0;                     /* Count bytes in buf.  */
                lp = lforw(bp->b_linep);
                while (lp != bp->b_linep) {
                        nbytes += llength(lp)+1;
                        lp = lforw(lp);
                }
                int_to_ascii(b, 6, nbytes);             /* 6 digit buffer size. */
                cp2 = &b[0];
                while ((c = *cp2++) != 0)
                        *cp1++ = (char) c;
                *cp1++ = ' ';                   /* Gap.                 */
                cp2 = &bp->b_bname[0];          /* Buffer name          */
                while ((c = *cp2++) != 0)
                        *cp1++ = (char) c;
                cp2 = &bp->b_fname[0];          /* File name            */
                if (*cp2 != 0) {
                        while (cp1 < &line[1+1+6+1+NBUFN+1])
                                *cp1++ = ' ';
                        while ((c = *cp2++) != 0) {
                                if (cp1 < &line[128-1])
                                        *cp1++ = (char) c;
                        }
                }
                *cp1 = 0;                       /* Add to the buffer.   */
                if (addline(blistp,line) == FALSE)
                        return (FALSE);
                bp = bp->b_bufp;
        }
        return (TRUE);                          /* All done             */
}

/*
 * The argument "text" points to
 * a string. Append this line to the
 * buffer. Handcraft the EOL
 * on the end. Return TRUE if it worked and
 * FALSE if you ran out of room.
 */
globle int addline(bufferp,text)
BUFFER *bufferp;
char    *text;
{
        register LINE   *lp;
        register int    i;
        register int    ntext;

        ntext = strlen(text);
        if ((lp=lalloc(ntext)) == NULL)
                return (FALSE);
        for (i=0; i<ntext; ++i)
                lputc(lp, i, text[i]);
        bufferp->b_linep->l_bp->l_fp = lp;       /* Hook onto the end    */
        lp->l_bp = bufferp->b_linep->l_bp;
        bufferp->b_linep->l_bp = lp;
        lp->l_fp = bufferp->b_linep;
        if (bufferp->b_dotp == bufferp->b_linep)  /* If "." is at the end */
                bufferp->b_dotp = lp;            /* move it to new line  */
        return (TRUE);
}

/*
 * Look through the list of
 * buffers. Return TRUE if there
 * are any changed buffers. Buffers
 * that hold magic internal stuff are
 * not considered; who cares if the
 * list of buffer names is hacked.
 * Return FALSE if no buffers
 * have been changed.
 */
globle int anycb()
{
        register BUFFER *bp;

        bp = bheadp;
        while (bp != NULL) {
                if ((bp->b_flag&BFTEMP)==0 && (bp->b_flag&BFCHG)!=0)
                        return (TRUE);
                bp = bp->b_bufp;
        }
        return (FALSE);
}

/*
 * Find a buffer, by name. Return a pointer
 * to the BUFFER structure associated with it. If
 * the named buffer is found, but is a TEMP buffer (like
 * the buffer list) conplain. If the buffer is not found
 * and the "cflag" is TRUE, create it. The "bflag" is
 * the settings for the flags in in buffer.
 */
globle BUFFER  *bfind(bname, cflag, bflag)
char   *bname;
int cflag,bflag;
{
        register BUFFER *bp;
        register LINE   *lp;

        bp = bheadp;
        while (bp != NULL) {
                if (strcmp(bname, bp->b_bname) == 0) {
                        if ((bp->b_flag&BFTEMP) != 0) {
                                mlwrite("Cannot select builtin buffer");
                                return (NULL);
                        }
                        return (bp);
                }
                bp = bp->b_bufp;
        }
        if (cflag != FALSE) {
                if ((bp=(BUFFER *)genalloc((unsigned) sizeof(BUFFER))) == NULL)
                        return (NULL);
                if ((lp=lalloc(0)) == NULL) {
                        genfree((VOID *) bp,(unsigned) sizeof(BUFFER));
                        return (NULL);
                }
                bp->b_bufp  = bheadp;
                bheadp = bp;
                bp->b_dotp  = lp;
                bp->b_doto  = 0;
                bp->b_markp = NULL;
                bp->b_marko = 0;
                bp->b_flag  = (char) bflag;
                bp->b_nwnd  = 0;
                bp->b_linep = lp;
                strcpy(bp->b_fname, "");
                strcpy(bp->b_bname, bname);
                lp->l_fp = lp;
                lp->l_bp = lp;
        }
        return (bp);
}

/*
 * This routine blows away all of the text
 * in a buffer. If the buffer is marked as changed
 * then we ask if it is ok to blow it away; this is
 * to save the user the grief of losing text. The
 * window chain is nearly always wrong if this gets
 * called; the caller must arrange for the updates
 * that are required. Return TRUE if everything
 * looks good.
 */
globle int bclear(bp)
BUFFER *bp;
{
        register LINE   *lp;
        register int    s;

        if ((bp->b_flag&BFTEMP) == 0            /* Not scratch buffer.  */
           && (bp->b_flag&BFCHG) != 0              /* Something changed    */
           && (s=mlyesno("Discard changes")) != TRUE)
                return (s);
        bp->b_flag  &= ~BFCHG;                  /* Not changed          */

        while ((lp=lforw(bp->b_linep)) != bp->b_linep)
                lfree(lp);
        bp->b_dotp  = bp->b_linep;              /* Fix "."              */
        bp->b_doto  = 0;
        bp->b_markp = NULL;                     /* Invalidate "mark"    */
        bp->b_marko = 0;
        return (TRUE);