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Diffstat (limited to 'src/cm.c')
| -rw-r--r-- | src/cm.c | 414 |
1 files changed, 0 insertions, 414 deletions
diff --git a/src/cm.c b/src/cm.c deleted file mode 100644 index da09ac22a88..00000000000 --- a/src/cm.c +++ /dev/null @@ -1,414 +0,0 @@ -/* Cursor motion subroutines for GNU Emacs. - Copyright (C) 1985 Free Software Foundation, Inc. - based primarily on public domain code written by Chris Torek - -This file is part of GNU Emacs. - -GNU Emacs is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 1, or (at your option) -any later version. - -GNU Emacs is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU General Public License for more details. - -You should have received a copy of the GNU General Public License -along with GNU Emacs; see the file COPYING. If not, write to -the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ - - -#include <config.h> -#include <stdio.h> -#include "cm.h" -#include "termhooks.h" - -#define BIG 9999 /* 9999 good on VAXen. For 16 bit machines - use about 2000.... */ - -char *tgoto (); - -extern char *BC, *UP; - -int cost; /* sums up costs */ - -/* ARGSUSED */ -evalcost (c) - char c; -{ - cost++; -} - -void -cmputc (c) - char c; -{ - if (termscript) - fputc (c & 0177, termscript); - putchar (c & 0177); -} - -/* NEXT TWO ARE DONE WITH MACROS */ -#if 0 -/* - * Assume the cursor is at row row, column col. Normally used only after - * clearing the screen, when the cursor is at (0, 0), but what the heck, - * let's let the guy put it anywhere. - */ - -static -at (row, col) { - curY = row; - curX = col; -} - -/* - * Add n columns to the current cursor position. - */ - -static -addcol (n) { - curX += n; - - /* - * If cursor hit edge of screen, what happened? - * N.B.: DO NOT!! write past edge of screen. If you do, you - * deserve what you get. Furthermore, on terminals with - * autowrap (but not magicwrap), don't write in the last column - * of the last line. - */ - - if (curX == Wcm.cm_cols) { - /* - * Well, if magicwrap, still there, past the edge of the - * screen (!). If autowrap, on the col 0 of the next line. - * Otherwise on last column. - */ - - if (Wcm.cm_magicwrap) - ; /* "limbo" */ - else if (Wcm.cm_autowrap) { - curX = 0; - curY++; /* Beware end of screen! */ - } - else - curX--; - } -} -#endif - -/* - * (Re)Initialize the cost factors, given the output speed of the terminal - * in the variable ospeed. (Note: this holds B300, B9600, etc -- ie stuff - * out of <sgtty.h>.) - */ - -cmcostinit () -{ - char *p; - -#define COST(x,e) (x ? (cost = 0, tputs (x, 1, e), cost) : BIG) -#define CMCOST(x,e) ((x == 0) ? BIG : (p = tgoto(x, 0, 0), COST(p ,e))) - - Wcm.cc_up = COST (Wcm.cm_up, evalcost); - Wcm.cc_down = COST (Wcm.cm_down, evalcost); - Wcm.cc_left = COST (Wcm.cm_left, evalcost); - Wcm.cc_right = COST (Wcm.cm_right, evalcost); - Wcm.cc_home = COST (Wcm.cm_home, evalcost); - Wcm.cc_cr = COST (Wcm.cm_cr, evalcost); - Wcm.cc_ll = COST (Wcm.cm_ll, evalcost); - Wcm.cc_tab = Wcm.cm_tabwidth ? COST (Wcm.cm_tab, evalcost) : BIG; - - /* - * These last three are actually minimum costs. When (if) they are - * candidates for the least-cost motion, the real cost is computed. - * (Note that "0" is the assumed to generate the minimum cost. - * While this is not necessarily true, I have yet to see a terminal - * for which is not; all the terminals that have variable-cost - * cursor motion seem to take straight numeric values. --ACT) - */ - - Wcm.cc_abs = CMCOST (Wcm.cm_abs, evalcost); - Wcm.cc_habs = CMCOST (Wcm.cm_habs, evalcost); - Wcm.cc_vabs = CMCOST (Wcm.cm_vabs, evalcost); - -#undef CMCOST -#undef COST -} - -/* - * Calculate the cost to move from (srcy, srcx) to (dsty, dstx) using - * up and down, and left and right, motions, and tabs. If doit is set - * actually perform the motion. - */ - -static -calccost (srcy, srcx, dsty, dstx, doit) -{ - register int deltay, - deltax, - c, - totalcost; - int ntabs, - n2tabs, - tabx, - tab2x, - tabcost; - register char *p; - - /* If have just wrapped on a terminal with xn, - don't believe the cursor position: give up here - and force use of absolute positioning. */ - - if (curX == Wcm.cm_cols) - goto fail; - - totalcost = 0; - if ((deltay = dsty - srcy) == 0) - goto x; - if (deltay < 0) - p = Wcm.cm_up, c = Wcm.cc_up, deltay = -deltay; - else - p = Wcm.cm_down, c = Wcm.cc_down; - if (c == BIG) { /* caint get thar from here */ - if (doit) - printf ("OOPS"); - return c; - } - totalcost = c * deltay; - if (doit) - while (--deltay >= 0) - tputs (p, 1, cmputc); -x: - if ((deltax = dstx - srcx) == 0) - goto done; - if (deltax < 0) { - p = Wcm.cm_left, c = Wcm.cc_left, deltax = -deltax; - goto dodelta; /* skip all the tab junk */ - } - /* Tabs (the toughie) */ - if (Wcm.cc_tab >= BIG || !Wcm.cm_usetabs) - goto olddelta; /* forget it! */ - - /* - * ntabs is # tabs towards but not past dstx; n2tabs is one more - * (ie past dstx), but this is only valid if that is not past the - * right edge of the screen. We can check that at the same time - * as we figure out where we would be if we use the tabs (which - * we will put into tabx (for ntabs) and tab2x (for n2tabs)). - */ - - ntabs = (deltax + srcx % Wcm.cm_tabwidth) / Wcm.cm_tabwidth; - n2tabs = ntabs + 1; - tabx = (srcx / Wcm.cm_tabwidth + ntabs) * Wcm.cm_tabwidth; - tab2x = tabx + Wcm.cm_tabwidth; - - if (tab2x >= Wcm.cm_cols) /* too far (past edge) */ - n2tabs = 0; - - /* - * Now set tabcost to the cost for using ntabs, and c to the cost - * for using n2tabs, then pick the minimum. - */ - - /* cost for ntabs + cost for right motion */ - tabcost = ntabs ? ntabs * Wcm.cc_tab + (dstx - tabx) * Wcm.cc_right - : BIG; - - /* cost for n2tabs + cost for left motion */ - c = n2tabs ? n2tabs * Wcm.cc_tab + (tab2x - dstx) * Wcm.cc_left - : BIG; - - if (c < tabcost) /* then cheaper to overshoot & back up */ - ntabs = n2tabs, tabcost = c, tabx = tab2x; - - if (tabcost >= BIG) /* caint use tabs */ - goto newdelta; - - /* - * See if tabcost is less than just moving right - */ - - if (tabcost < (deltax * Wcm.cc_right)) { - totalcost += tabcost; /* use the tabs */ - if (doit) - while (--ntabs >= 0) - tputs (Wcm.cm_tab, 1, cmputc); - srcx = tabx; - } - - /* - * Now might as well just recompute the delta. - */ - -newdelta: - if ((deltax = dstx - srcx) == 0) - goto done; -olddelta: - if (deltax > 0) - p = Wcm.cm_right, c = Wcm.cc_right; - else - p = Wcm.cm_left, c = Wcm.cc_left, deltax = -deltax; - -dodelta: - if (c == BIG) { /* caint get thar from here */ -fail: - if (doit) - printf ("OOPS"); - return BIG; - } - totalcost += c * deltax; - if (doit) - while (--deltax >= 0) - tputs (p, 1, cmputc); -done: - return totalcost; -} - -#if 0 -losecursor () -{ - curY = -1; -} -#endif - -#define USEREL 0 -#define USEHOME 1 -#define USELL 2 -#define USECR 3 - -cmgoto (row, col) -{ - int homecost, - crcost, - llcost, - relcost, - directcost; - int use; - char *p, - *dcm; - - /* First the degenerate case */ - if (row == curY && col == curX) /* already there */ - return; - - if (curY >= 0 && curX >= 0) - { - /* We may have quick ways to go to the upper-left, bottom-left, - * start-of-line, or start-of-next-line. Or it might be best to - * start where we are. Examine the options, and pick the cheapest. - */ - - relcost = calccost (curY, curX, row, col, 0); - use = USEREL; - if ((homecost = Wcm.cc_home) < BIG) - homecost += calccost (0, 0, row, col, 0); - if (homecost < relcost) - relcost = homecost, use = USEHOME; - if ((llcost = Wcm.cc_ll) < BIG) - llcost += calccost (Wcm.cm_rows - 1, 0, row, col, 0); - if (llcost < relcost) - relcost = llcost, use = USELL; - if ((crcost = Wcm.cc_cr) < BIG) { - if (Wcm.cm_autolf) - if (curY + 1 >= Wcm.cm_rows) - crcost = BIG; - else - crcost += calccost (curY + 1, 0, row, col, 0); - else - crcost += calccost (curY, 0, row, col, 0); - } - if (crcost < relcost) - relcost = crcost, use = USECR; - directcost = Wcm.cc_abs, dcm = Wcm.cm_abs; - if (row == curY && Wcm.cc_habs < BIG) - directcost = Wcm.cc_habs, dcm = Wcm.cm_habs; - else if (col == curX && Wcm.cc_vabs < BIG) - directcost = Wcm.cc_vabs, dcm = Wcm.cm_vabs; - } - else - { - directcost = 0, relcost = 100000; - dcm = Wcm.cm_abs; - } - - /* - * In the following comparison, the = in <= is because when the costs - * are the same, it looks nicer (I think) to move directly there. - */ - if (directcost <= relcost) - { - /* compute REAL direct cost */ - cost = 0; - p = dcm == Wcm.cm_habs ? tgoto (dcm, row, col) : - tgoto (dcm, col, row); - tputs (p, 1, evalcost); - if (cost <= relcost) - { /* really is cheaper */ - tputs (p, 1, cmputc); - curY = row, curX = col; - return; - } - } - - switch (use) - { - case USEHOME: - tputs (Wcm.cm_home, 1, cmputc); - curY = 0, curX = 0; - break; - - case USELL: - tputs (Wcm.cm_ll, 1, cmputc); - curY = Wcm.cm_rows - 1, curX = 0; - break; - - case USECR: - tputs (Wcm.cm_cr, 1, cmputc); - if (Wcm.cm_autolf) - curY++; - curX = 0; - break; - } - - (void) calccost (curY, curX, row, col, 1); - curY = row, curX = col; -} - -/* Clear out all terminal info. - Used before copying into it the info on the actual terminal. - */ - -Wcm_clear () -{ - bzero (&Wcm, sizeof Wcm); - UP = 0; - BC = 0; -} - -/* - * Initialized stuff - * Return 0 if can do CM. - * Return -1 if cannot. - * Return -2 if size not specified. - */ - -Wcm_init () -{ -#if 0 - if (Wcm.cm_abs && !Wcm.cm_ds) - return 0; -#endif - if (Wcm.cm_abs) - return 0; - /* Require up and left, and, if no absolute, down and right */ - if (!Wcm.cm_up || !Wcm.cm_left) - return - 1; - if (!Wcm.cm_abs && (!Wcm.cm_down || !Wcm.cm_right)) - return - 1; - /* Check that we know the size of the screen.... */ - if (Wcm.cm_rows <= 0 || Wcm.cm_cols <= 0) - return - 2; - return 0; -} |