mirror of
https://github.com/rfivet/uemacs.git
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Initial import of em-4.0.15-lt
This is a slightly updated version of uemacs-PK (PK is Pekka Kutvonen) which was used at Helsinki University a long time ago. My fingers cannot be retrained.
This commit is contained in:
Linus Torvalds
462
basic.c
Normal file
462
basic.c
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@@ -0,0 +1,462 @@
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/* BASIC.C
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*
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* The routines in this file move the cursor around on the screen. They
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* compute a new value for the cursor, then adjust ".". The display code
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* always updates the cursor location, so only moves between lines, or
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* functions that adjust the top line in the window and invalidate the
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* framing, are hard.
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*
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* modified by Petri Kutvonen
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*/
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#include <stdio.h>
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#include "estruct.h"
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#include "edef.h"
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/*
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* Move the cursor to the
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* beginning of the current line.
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* Trivial.
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*/
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gotobol(f, n)
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{
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curwp->w_doto = 0;
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return (TRUE);
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}
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/*
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* Move the cursor backwards by "n" characters. If "n" is less than zero call
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* "forwchar" to actually do the move. Otherwise compute the new cursor
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* location. Error if you try and move out of the buffer. Set the flag if the
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* line pointer for dot changes.
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*/
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backchar(f, n)
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register int n;
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{
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register LINE *lp;
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if (n < 0)
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return (forwchar(f, -n));
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while (n--) {
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if (curwp->w_doto == 0) {
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if ((lp=lback(curwp->w_dotp)) == curbp->b_linep)
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return (FALSE);
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curwp->w_dotp = lp;
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curwp->w_doto = llength(lp);
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curwp->w_flag |= WFMOVE;
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} else
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curwp->w_doto--;
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}
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return (TRUE);
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}
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/*
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* Move the cursor to the end of the current line. Trivial. No errors.
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*/
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gotoeol(f, n)
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{
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curwp->w_doto = llength(curwp->w_dotp);
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return (TRUE);
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}
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/*
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* Move the cursor forwards by "n" characters. If "n" is less than zero call
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* "backchar" to actually do the move. Otherwise compute the new cursor
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* location, and move ".". Error if you try and move off the end of the
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* buffer. Set the flag if the line pointer for dot changes.
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*/
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forwchar(f, n)
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register int n;
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{
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if (n < 0)
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return (backchar(f, -n));
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while (n--) {
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if (curwp->w_doto == llength(curwp->w_dotp)) {
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if (curwp->w_dotp == curbp->b_linep)
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return (FALSE);
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curwp->w_dotp = lforw(curwp->w_dotp);
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curwp->w_doto = 0;
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curwp->w_flag |= WFMOVE;
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} else
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curwp->w_doto++;
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}
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return (TRUE);
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}
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gotoline(f, n) /* move to a particular line.
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argument (n) must be a positive integer for
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this to actually do anything */
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{
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register int status; /* status return */
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char arg[NSTRING]; /* buffer to hold argument */
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/* get an argument if one doesnt exist */
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if (f == FALSE) {
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if ((status = mlreply("Line to GOTO: ", arg, NSTRING)) != TRUE) {
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mlwrite("(Aborted)");
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return(status);
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}
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n = atoi(arg);
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}
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if (n < 1) /* if a bogus argument...then leave */
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return(FALSE);
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/* first, we go to the start of the buffer */
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curwp->w_dotp = lforw(curbp->b_linep);
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curwp->w_doto = 0;
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return(forwline(f, n-1));
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}
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/*
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* Goto the beginning of the buffer. Massive adjustment of dot. This is
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* considered to be hard motion; it really isn't if the original value of dot
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* is the same as the new value of dot. Normally bound to "M-<".
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*/
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gotobob(f, n)
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{
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curwp->w_dotp = lforw(curbp->b_linep);
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curwp->w_doto = 0;
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curwp->w_flag |= WFHARD;
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return (TRUE);
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}
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/*
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* Move to the end of the buffer. Dot is always put at the end of the file
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* (ZJ). The standard screen code does most of the hard parts of update.
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* Bound to "M->".
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*/
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gotoeob(f, n)
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{
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curwp->w_dotp = curbp->b_linep;
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curwp->w_doto = 0;
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curwp->w_flag |= WFHARD;
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return (TRUE);
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}
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/*
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* Move forward by full lines. If the number of lines to move is less than
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* zero, call the backward line function to actually do it. The last command
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* controls how the goal column is set. Bound to "C-N". No errors are
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* possible.
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*/
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forwline(f, n)
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{
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register LINE *dlp;
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if (n < 0)
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return (backline(f, -n));
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/* if we are on the last line as we start....fail the command */
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if (curwp->w_dotp == curbp->b_linep)
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return(FALSE);
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/* if the last command was not note a line move,
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reset the goal column */
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if ((lastflag&CFCPCN) == 0)
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curgoal = getccol(FALSE);
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/* flag this command as a line move */
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thisflag |= CFCPCN;
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/* and move the point down */
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dlp = curwp->w_dotp;
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while (n-- && dlp!=curbp->b_linep)
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dlp = lforw(dlp);
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/* reseting the current position */
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curwp->w_dotp = dlp;
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curwp->w_doto = getgoal(dlp);
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curwp->w_flag |= WFMOVE;
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return (TRUE);
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}
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/*
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* This function is like "forwline", but goes backwards. The scheme is exactly
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* the same. Check for arguments that are less than zero and call your
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* alternate. Figure out the new line and call "movedot" to perform the
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* motion. No errors are possible. Bound to "C-P".
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*/
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backline(f, n)
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{
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register LINE *dlp;
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if (n < 0)
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return (forwline(f, -n));
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/* if we are on the last line as we start....fail the command */
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if (lback(curwp->w_dotp) == curbp->b_linep)
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return(FALSE);
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/* if the last command was not note a line move,
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reset the goal column */
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if ((lastflag&CFCPCN) == 0)
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curgoal = getccol(FALSE);
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/* flag this command as a line move */
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thisflag |= CFCPCN;
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/* and move the point up */
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dlp = curwp->w_dotp;
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while (n-- && lback(dlp)!=curbp->b_linep)
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dlp = lback(dlp);
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/* reseting the current position */
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curwp->w_dotp = dlp;
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curwp->w_doto = getgoal(dlp);
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curwp->w_flag |= WFMOVE;
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return (TRUE);
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}
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#if WORDPRO
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gotobop(f, n) /* go back to the beginning of the current paragraph
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here we look for a <NL><NL> or <NL><TAB> or <NL><SPACE>
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combination to delimit the beginning of a paragraph */
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int f, n; /* default Flag & Numeric argument */
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{
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register int suc; /* success of last backchar */
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if (n < 0) /* the other way...*/
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return(gotoeop(f, -n));
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while (n-- > 0) { /* for each one asked for */
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/* first scan back until we are in a word */
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suc = backchar(FALSE, 1);
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while (!inword() && suc)
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suc = backchar(FALSE, 1);
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curwp->w_doto = 0; /* and go to the B-O-Line */
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/* and scan back until we hit a <NL><NL> or <NL><TAB>
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or a <NL><SPACE> */
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while (lback(curwp->w_dotp) != curbp->b_linep)
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if (llength(curwp->w_dotp) != 0 &&
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#if PKCODE
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((justflag == TRUE) ||
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#endif
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lgetc(curwp->w_dotp, curwp->w_doto) != TAB &&
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lgetc(curwp->w_dotp, curwp->w_doto) != ' ')
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#if PKCODE
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)
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#endif
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curwp->w_dotp = lback(curwp->w_dotp);
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else
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break;
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/* and then forward until we are in a word */
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suc = forwchar(FALSE, 1);
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while (suc && !inword())
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suc = forwchar(FALSE, 1);
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}
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curwp->w_flag |= WFMOVE; /* force screen update */
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return(TRUE);
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}
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gotoeop(f, n) /* go forword to the end of the current paragraph
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here we look for a <NL><NL> or <NL><TAB> or <NL><SPACE>
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combination to delimit the beginning of a paragraph */
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int f, n; /* default Flag & Numeric argument */
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{
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register int suc; /* success of last backchar */
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if (n < 0) /* the other way...*/
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return(gotobop(f, -n));
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while (n-- > 0) { /* for each one asked for */
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/* first scan forward until we are in a word */
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suc = forwchar(FALSE, 1);
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while (!inword() && suc)
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suc = forwchar(FALSE, 1);
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curwp->w_doto = 0; /* and go to the B-O-Line */
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if (suc) /* of next line if not at EOF */
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curwp->w_dotp = lforw(curwp->w_dotp);
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/* and scan forword until we hit a <NL><NL> or <NL><TAB>
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or a <NL><SPACE> */
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while (curwp->w_dotp != curbp->b_linep) {
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if (llength(curwp->w_dotp) != 0 &&
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#if PKCODE
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((justflag == TRUE) ||
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#endif
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lgetc(curwp->w_dotp, curwp->w_doto) != TAB &&
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lgetc(curwp->w_dotp, curwp->w_doto) != ' ')
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#if PKCODE
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)
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#endif
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curwp->w_dotp = lforw(curwp->w_dotp);
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else
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break;
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}
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/* and then backward until we are in a word */
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suc = backchar(FALSE, 1);
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while (suc && !inword()) {
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suc = backchar(FALSE, 1);
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}
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curwp->w_doto = llength(curwp->w_dotp); /* and to the EOL */
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}
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curwp->w_flag |= WFMOVE; /* force screen update */
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return(TRUE);
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}
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#endif
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/*
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* This routine, given a pointer to a LINE, and the current cursor goal
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* column, return the best choice for the offset. The offset is returned.
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* Used by "C-N" and "C-P".
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*/
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getgoal(dlp)
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register LINE *dlp;
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{
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register int c;
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register int col;
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register int newcol;
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register int dbo;
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col = 0;
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dbo = 0;
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while (dbo != llength(dlp)) {
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c = lgetc(dlp, dbo);
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newcol = col;
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if (c == '\t')
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newcol |= tabmask;
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else if (c<0x20 || c==0x7F)
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++newcol;
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++newcol;
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if (newcol > curgoal)
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break;
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col = newcol;
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++dbo;
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}
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return (dbo);
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}
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/*
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* Scroll forward by a specified number of lines, or by a full page if no
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* argument. Bound to "C-V". The "2" in the arithmetic on the window size is
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* the overlap; this value is the default overlap value in ITS EMACS. Because
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* this zaps the top line in the display window, we have to do a hard update.
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*/
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forwpage(f, n)
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register int n;
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{
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register LINE *lp;
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if (f == FALSE) {
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#if SCROLLCODE
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if (term.t_scroll != NULL)
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if (overlap == 0)
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n = curwp->w_ntrows / 3 * 2;
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else
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n = curwp->w_ntrows - overlap;
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else
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#endif
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n = curwp->w_ntrows - 2; /* Default scroll. */
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if (n <= 0) /* Forget the overlap */
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n = 1; /* if tiny window. */
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} else if (n < 0)
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return (backpage(f, -n));
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#if CVMVAS
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else /* Convert from pages */
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n *= curwp->w_ntrows; /* to lines. */
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#endif
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lp = curwp->w_linep;
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while (n-- && lp!=curbp->b_linep)
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lp = lforw(lp);
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curwp->w_linep = lp;
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curwp->w_dotp = lp;
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curwp->w_doto = 0;
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#if SCROLLCODE
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curwp->w_flag |= WFHARD|WFKILLS;
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#else
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curwp->w_flag |= WFHARD;
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#endif
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return (TRUE);
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}
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/*
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* This command is like "forwpage", but it goes backwards. The "2", like
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* above, is the overlap between the two windows. The value is from the ITS
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* EMACS manual. Bound to "M-V". We do a hard update for exactly the same
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* reason.
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*/
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backpage(f, n)
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register int n;
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{
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register LINE *lp;
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if (f == FALSE) {
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#if SCROLLCODE
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if (term.t_scroll != NULL)
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if (overlap == 0)
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n = curwp->w_ntrows / 3 * 2;
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else
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n = curwp->w_ntrows - overlap;
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else
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#endif
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n = curwp->w_ntrows - 2; /* Default scroll. */
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if (n <= 0) /* Don't blow up if the */
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n = 1; /* window is tiny. */
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} else if (n < 0)
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return (forwpage(f, -n));
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#if CVMVAS
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else /* Convert from pages */
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n *= curwp->w_ntrows; /* to lines. */
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#endif
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lp = curwp->w_linep;
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while (n-- && lback(lp)!=curbp->b_linep)
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lp = lback(lp);
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curwp->w_linep = lp;
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curwp->w_dotp = lp;
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curwp->w_doto = 0;
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#if SCROLLCODE
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curwp->w_flag |= WFHARD|WFINS;
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#else
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curwp->w_flag |= WFHARD;
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#endif
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return (TRUE);
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}
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/*
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* Set the mark in the current window to the value of "." in the window. No
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* errors are possible. Bound to "M-.".
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*/
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setmark(f, n)
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{
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curwp->w_markp = curwp->w_dotp;
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curwp->w_marko = curwp->w_doto;
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mlwrite("(Mark set)");
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return (TRUE);
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}
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/*
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* Swap the values of "." and "mark" in the current window. This is pretty
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* easy, bacause all of the hard work gets done by the standard routine
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* that moves the mark about. The only possible error is "no mark". Bound to
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* "C-X C-X".
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*/
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swapmark(f, n)
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{
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register LINE *odotp;
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register int odoto;
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if (curwp->w_markp == NULL) {
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mlwrite("No mark in this window");
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return (FALSE);
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}
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odotp = curwp->w_dotp;
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odoto = curwp->w_doto;
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curwp->w_dotp = curwp->w_markp;
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curwp->w_doto = curwp->w_marko;
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curwp->w_markp = odotp;
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curwp->w_marko = odoto;
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curwp->w_flag |= WFMOVE;
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return (TRUE);
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}
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