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- /*
- * This file contains the
- * command processing functions for
- * a number of random commands. There is
- * no functional grouping here, for
- * sure.
- */
- #include <stdio.h>
- #include "ed.h"
-
- int tabsize; /* Tab size (0: use real tabs) */
-
- /*
- * Set fill column to n.
- */
- setfillcol(f, n)
- {
- fillcol = n;
- return(TRUE);
- }
-
- /*
- * Display the current position of the cursor,
- * in origin 1 X-Y coordinates, the character that is
- * under the cursor (in octal), and the fraction of the
- * text that is before the cursor. The displayed column
- * is not the current column, but the column that would
- * be used on an infinite width display. Normally this
- * is bound to "C-X =".
- */
- showcpos(f, n)
- {
- register LINE *clp;
- register long nch;
- register int cbo;
- register long nbc;
- register int cac;
- register int ratio;
- register int col;
- register int i;
- register int c;
- register long nln;
- register long thisln;
-
- clp = lforw(curbp->b_linep); /* Grovel the data. */
- nln =0;
- for (cbo=nch=0;;++nch) {
- if (clp==curwp->w_dotp && cbo==curwp->w_doto) {
- thisln = nln+1L;
- nbc = nch;
- cac = (cbo==llength(clp)) ? '\n' : lgetc(clp,cbo);
- }
- if (cbo == llength(clp)) {
- if (clp == curbp->b_linep)
- break;
- clp = lforw(clp);
- cbo = 0;
- nln++;
- } else
- ++cbo;
- }
- col = getccol(FALSE); /* Get real column. */
- ratio = 0; /* Ratio before dot. */
- if (nch)
- ratio = (100L*nbc) / nch;
- mlwrite("X=%d Y=%d line=%D CH=0x%x .=%D (%d%% of %D)",
- col+1, currow+1, thisln, cac, nbc, ratio, nch);
- return (TRUE);
- }
-
- /*
- * Return current column. Stop at first non-blank given TRUE argument.
- */
- getccol(bflg)
- int bflg;
- {
- register int c, i, col;
- for (col=i=0; i<curwp->w_doto; ++i,col++) {
- c = lgetc(curwp->w_dotp, i);
- if (c!=' ' && c!='\t' && bflg)
- break;
- if (c == '\t')
- col |= 0x07;
- else if (c<0x20 || c==0x7F)
- ++col;
- }
- return(col);
- }
-
- /*
- * Twiddle the two characters on either side of
- * dot. If dot is at the end of the line twiddle the
- * two characters before it. Return with an error if dot
- * is at the beginning of line; it seems to be a bit
- * pointless to make this work. This fixes up a very
- * common typo with a single stroke. Normally bound
- * to "C-T". This always works within a line, so
- * "WFEDIT" is good enough.
- */
- twiddle(f, n)
- {
- register LINE *dotp;
- register int doto;
- register int cl;
- register int cr;
-
- dotp = curwp->w_dotp;
- doto = curwp->w_doto;
- if (doto==llength(dotp) && --doto<0)
- return (FALSE);
- cr = lgetc(dotp, doto);
- if (--doto < 0)
- return (FALSE);
- cl = lgetc(dotp, doto);
- lputc(dotp, doto+0, cr);
- lputc(dotp, doto+1, cl);
- lchange(WFEDIT);
- return (TRUE);
- }
-
- /*
- * Quote the next character, and
- * insert it into the buffer. All the characters
- * are taken literally, with the exception of the newline,
- * which always has its line splitting meaning. The character
- * is always read, even if it is inserted 0 times, for
- * regularity. Bound to "M-Q" (for me) and "C-Q" (for Rich,
- * and only on terminals that don't need XON-XOFF).
- */
- quote(f, n)
- {
- register int s;
- register int c;
-
- c = scr_ci() ;
- if (n < 0)
- return (FALSE);
- if (!n)
- return (TRUE);
- if (c == '\n') {
- do {
- s = lnewline();
- } while (s==TRUE && --n);
- return (s);
- }
- return (linsert(n, c));
- }
-
- /*
- * Set tab size if given non-default argument (n <> 1). Otherwise, insert a
- * tab into file. If given argument, n, of zero, change to true tabs.
- * If n > 1, simulate tab stop every n-characters using spaces.
- * This has to be done in this slightly funny way because the
- * tab (in ASCII) has been turned into "C-I" (in 10
- * bit code) already. Bound to "C-I".
- */
- tab(f, n)
- {
- if (n < 0)
- return (FALSE);
- if (!n || n > 1) {
- tabsize = n;
- return(TRUE);
- }
- if (! tabsize)
- return(linsert(1, '\t'));
- return(linsert(tabsize - (getccol(FALSE) % tabsize), ' '));
- }
-
- /*
- * Open up some blank space. The basic plan
- * is to insert a bunch of newlines, and then back
- * up over them. Everything is done by the subcommand
- * procerssors. They even handle the looping. Normally
- * this is bound to "C-O".
- */
- openline(f, n)
- {
- register int i;
- register int s;
-
- if (n < 0)
- return (FALSE);
- if (!n)
- return (TRUE);
- i = n; /* Insert newlines. */
- do {
- s = lnewline();
- } while (s==TRUE && --i);
- if (s == TRUE) /* Then back up overtop */
- s = backchar(f, n); /* of them all. */
- return (s);
- }
-
- /*
- * Insert a newline. Bound to "C-M".
- * If you are at the end of the line and the
- * next line is a blank line, just move into the
- * blank line. This makes "C-O" and "C-X C-O" work
- * nicely, and reduces the ammount of screen
- * update that has to be done. This would not be
- * as critical if screen update were a lot
- * more efficient.
- * Newline has been changed to accomodate overwrite mode.
- * If not at end of buffer cursor will be moved to beginning of next
- * line, otherwise newlines will be inserted at the end of the buffer.
- */
- newline(f, n)
- {
-
- if (n < 0)
- return (FALSE);
- /* if in insert mode then */
- if (!(curbp->b_flag & BFOVRWRITE))
- {
- /* insert new lines */
- insmodenewlin(f,n);
- }
- else
- /* in overwrite mode */
- {
- /* move to existing lines, if at end insert new lines */
- ovmodenewlin(f,n);
- }
-
- }
-
-
- insmodenewlin(f,n)
- {
- int nicol;
- register LINE *lp;
- register int s;
-
- while (n--)
- {
- lp = curwp->w_dotp;
- if (llength(lp) == curwp->w_doto
- && lp != curbp->b_linep
- && !llength(lforw(lp)))
- {
- if ((s=forwchar(FALSE, 1)) != TRUE)
- return (s);
- }
- else if ((s=lnewline()) != TRUE)
- return (s);
- }
- return (TRUE);
- }
-
- ovmodenewlin(f,n)
- {
- int nicol;
- register LINE *lp;
- register int s;
-
- while (n--)
- {
- lp = curwp->w_dotp;
- /* if not at end of buffer */
- if (lp != curbp->b_linep)
- {
- /* go to beginning of next line */
- if ((s=forwline(f,1)) != TRUE)
- return(s);
- curwp->w_doto = 0;
- }
- else
- /* otherwise */
- {
- /* insert newline at end of buffer */
- if((s=lnewline()) != TRUE)
- return(s);
- }
- return(TRUE);
- }
- }
-
- /*
- * Delete blank lines around dot.
- * What this command does depends if dot is
- * sitting on a blank line. If dot is sitting on a
- * blank line, this command deletes all the blank lines
- * above and below the current line. If it is sitting
- * on a non blank line then it deletes all of the
- * blank lines after the line. Normally this command
- * is bound to "C-X C-O". Any argument is ignored.
- */
- deblank(f, n)
- {
- register LINE *lp1;
- register LINE *lp2;
- register int nld;
-
- lp1 = curwp->w_dotp;
- while (!llength(lp1) && (lp2=lback(lp1))!=curbp->b_linep)
- lp1 = lp2;
- lp2 = lp1;
- nld = 0;
- while ((lp2=lforw(lp2))!=curbp->b_linep && !llength(lp2))
- ++nld;
- if (!nld)
- return (TRUE);
- curwp->w_dotp = lforw(lp1);
- curwp->w_doto = 0;
- return (ldelete(nld));
- }
-
- /*
- * Insert a newline, then enough
- * tabs and spaces to duplicate the indentation
- * of the previous line. Assumes tabs are every eight
- * characters. Quite simple. Figure out the indentation
- * of the current line. Insert a newline by calling
- * the standard routine. Insert the indentation by
- * inserting the right number of tabs and spaces.
- * Return TRUE if all ok. Return FALSE if one
- * of the subcomands failed. Normally bound
- * to "C-J".
- */
- indent(f, n)
- {
- register int nicol;
- register int c;
- register int i;
-
- if (n < 0)
- return (FALSE);
- while (n--) {
- for (nicol=i=0; i<llength(curwp->w_dotp); ++i) {
- c = lgetc(curwp->w_dotp, i);
- if (c!=' ' && c!='\t')
- break;
- if (c == '\t')
- nicol |= 0x07;
- ++nicol;
- }
- if (lnewline() == FALSE
- || ((i=nicol/8) && linsert(i, '\t')==FALSE)
- || ((i=nicol%8) && linsert(i, ' ')==FALSE))
- return (FALSE);
- }
- return (TRUE);
- }
-
- /*
- * Delete forward. This is real
- * easy, because the basic delete routine does
- * all of the work. Watches for negative arguments,
- * and does the right thing. If any argument is
- * present, it kills rather than deletes, to prevent
- * loss of text if typed with a big argument.
- * Normally bound to "C-D".
- */
- forwdel(f, n)
- {
- if (n < 0)
- return (backdel(f, -n));
- if (f != FALSE) { /* Really a kill. */
- if (!(lastflag&CFKILL))
- kdelete();
- thisflag |= CFKILL;
- }
- return (ldelete(n, f));
- }
-
- /*
- * Delete backwards. This is quite easy too,
- * because it's all done with other functions. Just
- * move the cursor back, and delete forwards.
- * Like delete forward, this actually does a kill
- * if presented with an argument. Bound to both
- * "RUBOUT" and "C-H".
- */
- backdel(f, n)
- {
- register int s;
-
- if (n < 0)
- return (forwdel(f, -n));
- if (f != FALSE) { /* Really a kill. */
- if (!(lastflag&CFKILL))
- kdelete();
- thisflag |= CFKILL;
- }
- if ((s=backchar(f, n)) == TRUE)
- s = ldelete(n, f);
- return (s);
- }
-
- /*
- * Kill text. If called without an argument,
- * it kills from dot to the end of the line, unless it
- * is at the end of the line, when it kills the newline.
- * If called with an argument of 0, it kills from the
- * start of the line to dot. If called with a positive
- * argument, it kills from dot forward over that number
- * of newlines. If called with a negative argument it
- * kills backwards that number of newlines. Normally
- * bound to "C-K".
- */
- kill(f, n)
- {
- register int chunk;
- register LINE *nextp;
-
- if (!(lastflag&CFKILL)) /* Clear kill buffer if */
- kdelete(); /* last wasn't a kill. */
- thisflag |= CFKILL;
- if (f == FALSE) {
- if (!(chunk = llength(curwp->w_dotp)-curwp->w_doto)) chunk = 1;
- } else if (!n) {
- chunk = curwp->w_doto;
- curwp->w_doto = 0;
- } else if (n > 0) {
- chunk = llength(curwp->w_dotp)-curwp->w_doto+1;
- nextp = lforw(curwp->w_dotp);
- while (--n) {
- if (nextp == curbp->b_linep)
- return (FALSE);
- chunk += llength(nextp)+1;
- nextp = lforw(nextp);
- }
- } else {
- mlwrite("neg kill");
- return (FALSE);
- }
- return (ldelete(chunk, TRUE));
- }
-
- /*
- * Yank text back from the kill buffer. This
- * is really easy. All of the work is done by the
- * standard insert routines. All you do is run the loop,
- * and check for errors. Bound to "C-Y". The blank
- * lines are inserted with a call to "newline"
- * instead of a call to "lnewline" so that the magic
- * stuff that happens when you type a carriage
- * return also happens when a carriage return is
- * yanked back from the kill buffer.
- */
- yank(f, n)
- {
- register int c;
- register int i;
- extern int kused;
-
- if (n < 0)
- return (FALSE);
- while (n--) {
- i = 0;
- while ((c=kremove(i)) >= 0) {
- if (c == '\n') {
- if (insmodenewlin(FALSE, 1) == FALSE)
- return (FALSE);
- } else {
- if (linsert(1, c) == FALSE)
- return (FALSE);
- }
- ++i;
- }
- }
- return (TRUE);
- }
-
- /* toggle between the insert and overwrite modes */
- togglemode()
- {
- /* if in overwrite mode */
- if (curbp->b_flag & BFOVRWRITE)
- /* change to insert mode */
- curbp->b_flag &= ~BFOVRWRITE;
- else
- /* change from insert mode to overwrite mode */
- curbp->b_flag |= BFOVRWRITE;
- /* cause the mode line to be redisplayed */
- curwp->w_flag |= WFMODE;
- }
-