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- #include "jam.h"
- #include"stdlib.h"
- /*
- * Window handling.
- */
- #include "def.h"
- #include "keyname.h"
-
- static char *only1window = "Only 1 window.";
- /*
- * Reposition dot in the current
- * window to line "n". If the argument is
- * positive, it is that line. If it is negative it
- * is that line from the bottom. If it is 0 the window
- * is centered (this is what the standard redisplay code
- * does). If GOSREC is undefined, default is 0, so it acts like GNU.
- * If GOSREC is defined, with no argument it defaults to 1
- * and works like in Gosling.
- */
- /*ARGSUSED*/
- reposition(f, n)
- int f, n;
- {
- #ifndef GOSREC
- curwp->w_force = (char)((f & FFARG) ? (n>=0 ? n+1 : n) : 0);
- #else
- curwp->w_force = n;
- #endif
- curwp->w_flag |= WFFORCE;
- sgarbf = TRUE;
- return TRUE;
- }
-
- /*
- * Refresh the display. A call is made to the
- * "ttresize" entry in the terminal handler, which tries
- * to reset "nrow" and "ncol". They will, however, never
- * be set outside of the NROW or NCOL range. If the display
- * changed size, arrange that everything is redone, then
- * call "update" to fix the display. We do this so the
- * new size can be displayed. In the normal case the
- * call to "update" in "main.c" refreshes the screen,
- * and all of the windows need not be recomputed.
- * Note that when you get to the "display unusable"
- * message, the screen will be messed up. If you make
- * the window bigger again, and send another command,
- * everything will get fixed. Hopefully!
- */
- /*ARGSUSED*/
- myrefresh(f, n)
- int f, n;
- {
- register EWINDOW *wp;
- register int oldnrow;
- register int oldncol;
-
- oldnrow = nrow;
- oldncol = ncol;
- #ifdef WINDOWED
- WindowErase(); /* only called for case of resize, so force this! */
- oldnrow = -1; /* hack */
- #endif
- ttresize();
- if (nrow!=oldnrow || ncol!=oldncol)
- {
- wp = wheadp; /* Find last. */
- while (wp->w_wndp != NULL)
- wp = wp->w_wndp;
- if (nrow < wp->w_toprow+3) /* Check if too small. */
- {
- #ifdef WINDOWED
- WindowMessage("Some window too small.", FALSE);
- #else
- ewprintf("Display unusable");
- #endif
- return (FALSE);
- }
- wp->w_ntrows = (char)(nrow-wp->w_toprow-2);
- sgarbf = TRUE;
- update();
- ewprintf("New size %d by %d", nrow, ncol);
- }
- else
- sgarbf = TRUE;
- return TRUE;
- }
-
- /*
- * The command to make the next
- * window (next => down the screen)
- * the current window. There are no real
- * errors, although the command does
- * nothing if there is only 1 window on
- * the screen.
- */
- /*ARGSUSED*/
- nextwind(f, n)
- int f, n;
- {
- register EWINDOW *wp;
-
- if (wheadp->w_wndp == NULL) /* feeback-for-user check */
- ewprintf(only1window);
- if ((wp=curwp->w_wndp) == NULL)
- wp = wheadp;
- curwp = wp;
- curbp = wp->w_bufp;
- return TRUE;
- }
-
- #ifdef GOSMACS
- /* not in Gnu Emacs */
- /*
- * This command makes the previous
- * window (previous => up the screen) the
- * current window. There arn't any errors,
- * although the command does not do a lot
- * if there is 1 window.
- */
- /*ARGSUSED*/
- prevwind(f, n)
- int f, n;
- {
- register EWINDOW *wp1;
- register EWINDOW *wp2;
-
- if (wheadp->w_wndp == NULL) /* feeback-for-user check */
- ewprintf(only1window);
- wp1 = wheadp;
- wp2 = curwp;
- if (wp1 == wp2)
- wp2 = NULL;
- while (wp1->w_wndp != wp2)
- wp1 = wp1->w_wndp;
- curwp = wp1;
- curbp = wp1->w_bufp;
- return TRUE;
- }
- #endif
-
- /*
- * This command makes the current
- * window the only window on the screen.
- * Try to set the framing
- * so that "." does not have to move on
- * the display. Some care has to be taken
- * to keep the values of dot and mark
- * in the buffer structures right if the
- * distruction of a window makes a buffer
- * become undisplayed.
- */
- /*ARGSUSED*/
- onlywind(f, n)
- int f, n;
- {
- register EWINDOW *wp;
- register LINE *lp;
- register int i;
-
- while (wheadp != curwp)
- {
- wp = wheadp;
- wheadp = wp->w_wndp;
- if (--wp->w_bufp->b_nwnd == 0)
- {
- wp->w_bufp->b_dotp = wp->w_dotp;
- wp->w_bufp->b_doto = wp->w_doto;
- wp->w_bufp->b_markp = wp->w_markp;
- wp->w_bufp->b_marko = wp->w_marko;
- }
- free((char *) wp);
- }
- while (curwp->w_wndp != NULL)
- {
- wp = curwp->w_wndp;
- curwp->w_wndp = wp->w_wndp;
- if (--wp->w_bufp->b_nwnd == 0)
- {
- wp->w_bufp->b_dotp = wp->w_dotp;
- wp->w_bufp->b_doto = wp->w_doto;
- wp->w_bufp->b_markp = wp->w_markp;
- wp->w_bufp->b_marko = wp->w_marko;
- }
- free((char *) wp);
- }
- lp = curwp->w_linep;
- i = curwp->w_toprow;
- while (i!=0 && lback(lp)!=curbp->b_linep)
- {
- --i;
- lp = lback(lp);
- }
- curwp->w_toprow = 0;
- curwp->w_ntrows = (char)(nrow-2); /* 2 = mode, echo. */
- curwp->w_linep = lp;
- curwp->w_flag |= WFMODE|WFHARD;
- return TRUE;
- }
-
- /*
- * Split the current window. A window
- * smaller than 3 lines cannot be split.
- * The only other error that is possible is
- * a "malloc" failure allocating the structure
- * for the new window.
- */
- /*ARGSUSED*/
- splitwind(f, n)
- int f, n;
- {
- register EWINDOW *wp;
- register LINE *lp;
- register int ntru;
- register int ntrd;
- int ntrl;
- EWINDOW *wp1, *wp2;
-
- if (curwp->w_ntrows < 3)
- {
- ewprintf("Cannot split a %d line window", curwp->w_ntrows);
- return (FALSE);
- }
- if ((wp = (EWINDOW *)calloc(1, sizeof(EWINDOW))) == NULL)
- {
- ewprintf(Nobytes, sizeof(EWINDOW));
- return (FALSE);
- }
- curbp->b_nwnd++; /* Displayed yet again */
- wp->w_bufp = curwp->w_bufp; /*curbp;*/
- wp->w_dotp = curwp->w_dotp;
- wp->w_doto = curwp->w_doto;
- wp->w_markp = curwp->w_markp;
- wp->w_marko = curwp->w_marko;
- ntru = (curwp->w_ntrows-1) / 2; /* Upper size */
- ntrl = (curwp->w_ntrows-1) - ntru; /* Lower size */
- lp = curwp->w_linep;
- ntrd = 0;
- while (lp != curwp->w_dotp)
- {
- ++ntrd;
- lp = lforw(lp);
- }
- lp = curwp->w_linep;
- if (ntrd <= ntru) /* Old is upper window. */
- {
- if (ntrd == ntru) /* Hit mode line. */
- lp = lforw(lp);
- curwp->w_ntrows = (char)ntru;
- wp->w_wndp = curwp->w_wndp;
- curwp->w_wndp = wp;
- wp->w_toprow = (char)(curwp->w_toprow+ntru+1);
- wp->w_ntrows = (char)ntrl;
- }
- else /* Old is lower window */
- {
- wp1 = NULL;
- wp2 = wheadp;
- while (wp2 != curwp)
- {
- wp1 = wp2;
- wp2 = wp2->w_wndp;
- }
- if (wp1 == NULL)
- wheadp = wp;
- else
- wp1->w_wndp = wp;
- wp->w_wndp = curwp;
- wp->w_toprow = curwp->w_toprow;
- wp->w_ntrows = (char)ntru++; /* Mode line. */
- curwp->w_toprow += ntru;
- curwp->w_ntrows = (char)ntrl;
- while (ntru--)
- lp = lforw(lp);
- }
- curwp->w_linep = lp; /* Adjust the top lines */
- wp->w_linep = lp; /* if necessary. */
- curwp->w_flag |= WFMODE|WFHARD;
- wp->w_flag |= WFMODE|WFHARD;
- return TRUE;
- }
-
- /*
- * Enlarge the current window.
- * Find the window that loses space. Make
- * sure it is big enough. If so, hack the window
- * descriptions, and ask redisplay to do all the
- * hard work. You don't just set "force reframe"
- * because dot would move.
- */
- /*ARGSUSED*/
- enlargewind(f, n)
- int f, n;
- {
- register EWINDOW *adjwp;
- register LINE *lp;
- register int i;
-
- if (n < 0)
- return shrinkwind(f, -n);
- if (wheadp->w_wndp == NULL)
- {
- ewprintf(only1window);
- return FALSE;
- }
- if ((adjwp=curwp->w_wndp) == NULL)
- {
- adjwp = wheadp;
- while (adjwp->w_wndp != curwp)
- adjwp = adjwp->w_wndp;
- }
- if (adjwp->w_ntrows <= (char)n)
- {
- ewprintf(Impossible);
- return FALSE;
- }
- if (curwp->w_wndp == adjwp)
- { /* Shrink below. */
- lp = adjwp->w_linep;
- for (i=0; i<n && lp!=adjwp->w_bufp->b_linep; ++i)
- lp = lforw(lp);
- adjwp->w_linep = lp;
- adjwp->w_toprow += n;
- }
- else /* Shrink above. */
- {
- lp = curwp->w_linep;
- for (i=0; i<n && lback(lp)!=curbp->b_linep; ++i)
- lp = lback(lp);
- curwp->w_linep = lp;
- curwp->w_toprow -= n;
- }
- curwp->w_ntrows += n;
- adjwp->w_ntrows -= n;
- curwp->w_flag |= WFMODE|WFHARD;
- adjwp->w_flag |= WFMODE|WFHARD;
- return TRUE;
- }
-
- /*
- * Shrink the current window.
- * Find the window that gains space. Hack at
- * the window descriptions. Ask the redisplay to
- * do all the hard work.
- */
- shrinkwind(f, n)
- int f, n;
- {
- register EWINDOW *adjwp;
- register LINE *lp;
- register int i;
-
- if (n < 0)
- return enlargewind(f, -n);
- if (wheadp->w_wndp == NULL)
- {
- ewprintf(only1window);
- return FALSE;
- }
- /*
- * Bit of flakiness - KRANDOM means it was an internal call, and
- * to be trusted implicitly about sizes.
- */
- if ( !(f & FFRAND) && curwp->w_ntrows <= (char)n)
- {
- ewprintf(Impossible);
- return (FALSE);
- }
- if ((adjwp=curwp->w_wndp) == NULL)
- {
- adjwp = wheadp;
- while (adjwp->w_wndp != curwp)
- adjwp = adjwp->w_wndp;
- }
- if (curwp->w_wndp == adjwp) /* Grow below. */
- {
- lp = adjwp->w_linep;
- for (i=0; i<n && lback(lp)!=adjwp->w_bufp->b_linep; ++i)
- lp = lback(lp);
- adjwp->w_linep = lp;
- adjwp->w_toprow -= n;
- }
- else
- { /* Grow above. */
- lp = curwp->w_linep;
- for (i=0; i<n && lp!=curbp->b_linep; ++i)
- lp = lforw(lp);
- curwp->w_linep = lp;
- curwp->w_toprow += n;
- }
- curwp->w_ntrows -= n;
- adjwp->w_ntrows += n;
- curwp->w_flag |= WFMODE|WFHARD;
- adjwp->w_flag |= WFMODE|WFHARD;
- return (TRUE);
- }
-
- /*
- * Delete current window. Call shrink-window to do the screen
- * updating, then throw away the window.
- */
- /*ARGSUSED*/
- delwind(f, n)
- int f, n;
- {
- register EWINDOW *wp, *nwp;
-
- wp = curwp; /* Cheap... */
- /* shrinkwind returning false means only one window... */
-
- if (shrinkwind(FFRAND, wp->w_ntrows + 1) == FALSE)
- return FALSE;
-
- wp->w_bufp->b_nwnd--;
- if (wp->w_bufp->b_nwnd == 0)
- {
- wp->w_bufp->b_dotp = wp->w_dotp;
- wp->w_bufp->b_doto = wp->w_doto;
- wp->w_bufp->b_markp = wp->w_markp;
- wp->w_bufp->b_marko = wp->w_marko;
- }
-
- /* since shrinkwind did't crap out, we know we have a second window
- */
- if (wp == wheadp)
- wheadp = curwp = wp->w_wndp; /* deleting first */
- else if ((curwp = wp->w_wndp) == NULL)
- curwp = wheadp; /* deleting last */
- curbp = curwp->w_bufp;
-
- for (nwp = wheadp; nwp != NULL; nwp = nwp->w_wndp)
- if (nwp->w_wndp == wp)
- {
- nwp->w_wndp = wp->w_wndp;
- break ;
- }
- free((char *) wp);
- return TRUE;
- }
- /*
- * Pick a window for a pop-up.
- * Split the screen if there is only
- * one window. Pick the uppermost window that
- * isn't the current window. An LRU algorithm
- * might be better. Return a pointer, or
- * NULL on error.
- */
- EWINDOW *wpopup()
- {
- register EWINDOW *wp;
-
- if (wheadp->w_wndp == NULL
- && splitwind(FFRAND, 0) == FALSE)
- return NULL;
- wp = wheadp; /* Find window to use */
- while (wp!=NULL && wp==curwp)
- wp = wp->w_wndp;
- return wp;
- }
-
-