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/*
* The routines in this file move the cursor around on the screen. They
* compute a new value for the cursor, then adjust ".". The display code
* always updates the cursor location, so only moves between lines, or
* functions that adjust the top line in the window and invalidate the
* framing, are hard.
*/
#include <stdio.h>
#include "estruct.h"
#include "etype.h"
#include "edef.h"
#include "elang.h"
/*
* Move the cursor to the
* beginning of the current line.
* Trivial.
*/
PASCAL NEAR gotobol(f, n)
{
curwp->w_doto = 0;
return(TRUE);
}
/*
* Move the cursor backwards by "n" characters. If "n" is less than zero call
* "forwchar" to actually do the move. Otherwise compute the new cursor
* location. Error if you try and move out of the buffer. Set the flag if the
* line pointer for dot changes.
*/
PASCAL NEAR backchar(f, n)
register int n;
{
register LINE *lp;
if (n < 0)
return(forwchar(f, -n));
while (n--) {
if (curwp->w_doto == 0) {
if ((lp=lback(curwp->w_dotp)) == curbp->b_linep)
return(FALSE);
curwp->w_dotp = lp;
curwp->w_doto = llength(lp);
curwp->w_flag |= WFMOVE;
} else
curwp->w_doto--;
}
return(TRUE);
}
/*
* Move the cursor to the end of the current line. Trivial. No errors.
*/
PASCAL NEAR gotoeol(f, n)
{
curwp->w_doto = llength(curwp->w_dotp);
return(TRUE);
}
/*
* Move the cursor forwards by "n" characters. If "n" is less than zero call
* "backchar" to actually do the move. Otherwise compute the new cursor
* location, and move ".". Error if you try and move off the end of the
* buffer. Set the flag if the line pointer for dot changes.
*/
PASCAL NEAR forwchar(f, n)
register int n;
{
if (n < 0)
return(backchar(f, -n));
while (n--) {
if (curwp->w_doto == llength(curwp->w_dotp)) {
if (curwp->w_dotp == curbp->b_linep)
return(FALSE);
curwp->w_dotp = lforw(curwp->w_dotp);
curwp->w_doto = 0;
curwp->w_flag |= WFMOVE;
} else
curwp->w_doto++;
}
return(TRUE);
}
PASCAL NEAR gotoline(f, n) /* move to a particular line.
argument (n) must be a positive integer for
this to actually do anything */
{
register int status; /* status return */
char arg[NSTRING]; /* buffer to hold argument */
/* get an argument if one doesnt exist */
if (f == FALSE) {
if ((status = mlreply(TEXT7, arg, NSTRING)) != TRUE) {
/* "Line to GOTO: " */
mlwrite(TEXT8);
/* "[Aborted]" */
return(status);
}
n = asc_int(arg);
}
if (n < 1) /* if a bogus argument...then leave */
return(FALSE);
/* first, we go to the start of the buffer */
curwp->w_dotp = lforw(curbp->b_linep);
curwp->w_doto = 0;
return(forwline(f, n-1));
}
/*
* Goto the beginning of the buffer. Massive adjustment of dot. This is
* considered to be hard motion; it really isn't if the original value of dot
* is the same as the new value of dot. Normally bound to "M-<".
*/
PASCAL NEAR gotobob(f, n)
{
curwp->w_dotp = lforw(curbp->b_linep);
curwp->w_doto = 0;
curwp->w_flag |= WFHARD;
return(TRUE);
}
/*
* Move to the end of the buffer. Dot is always put at the end of the file
* (ZJ). The standard screen code does most of the hard parts of update.
* Bound to "M->".
*/
PASCAL NEAR gotoeob(f, n)
{
curwp->w_dotp = curbp->b_linep;
curwp->w_doto = 0;
curwp->w_flag |= WFHARD;
return(TRUE);
}
#if KEEPPOS
/*
* Move to the top of the screen. The standsrd screen code does most of the
* hard parts of update.
*
*/
PASCAL NEAR gotobos(f, n)
{
curwp->w_dotp = curwp->w_linep;
curwp->w_doto = 0;
curwp->w_flag |= WFHARD;
return(TRUE);
} /* gotobos */
/*
* Goto the end of the screen.
*/
PASCAL NEAR gotoeos(f, n)
{
register LINE *lp;
int currow;
lp = curwp->w_linep;
currow = curwp->w_ntrows - 1;
while (currow-- && lp!=curbp->b_linep) lp = lforw(lp);
curwp->w_dotp = lp;
curwp->w_doto = 0;
curwp->w_flag |= WFHARD;
return(TRUE);
} /* gotoeos */
#endif
/*
* Move forward by full lines. If the number of lines to move is less than
* zero, call the backward line function to actually do it. The last command
* controls how the goal column is set. Bound to "C-N". No errors are
* possible.
*/
PASCAL NEAR forwline(f, n)
{
register LINE *dlp;
if (n < 0)
return(backline(f, -n));
/* if we are on the last line as we start....fail the command */
if (curwp->w_dotp == curbp->b_linep)
return(FALSE);
/* if the last command was not note a line move,
reset the goal column */
if ((lastflag&CFCPCN) == 0)
curgoal = getccol(FALSE);
/* flag this command as a line move */
thisflag |= CFCPCN;
/* and move the point down */
dlp = curwp->w_dotp;
while (n-- && dlp!=curbp->b_linep)
dlp = lforw(dlp);
/* reseting the current position */
curwp->w_dotp = dlp;
curwp->w_doto = getgoal(dlp);
curwp->w_flag |= WFMOVE;
return(TRUE);
}
/*
* This function is like "forwline", but goes backwards. The scheme is exactly
* the same. Check for arguments that are less than zero and call your
* alternate. Figure out the new line and call "movedot" to perform the
* motion. No errors are possible. Bound to "C-P".
*/
PASCAL NEAR backline(f, n)
{
register LINE *dlp;
if (n < 0)
return(forwline(f, -n));
/* if we are on the last line as we start....fail the command */
if (lback(curwp->w_dotp) == curbp->b_linep)
return(FALSE);
/* if the last command was not note a line move,
reset the goal column */
if ((lastflag&CFCPCN) == 0)
curgoal = getccol(FALSE);
/* flag this command as a line move */
thisflag |= CFCPCN;
/* and move the point up */
dlp = curwp->w_dotp;
while (n-- && lback(dlp)!=curbp->b_linep)
dlp = lback(dlp);
/* reseting the current position */
curwp->w_dotp = dlp;
curwp->w_doto = getgoal(dlp);
curwp->w_flag |= WFMOVE;
return(TRUE);
}
#if WORDPRO
PASCAL NEAR gotobop(f, n) /* go back to the beginning of the current paragraph
here we look for a <NL><NL> or <NL><TAB> or <NL><SPACE>
combination to delimit the beginning of a paragraph */
int f, n; /* default Flag & Numeric argument */
{
register int suc; /* success of last backchar */
if (n < 0) /* the other way...*/
return(gotoeop(f, -n));
while (n-- > 0) { /* for each one asked for */
/* first scan back until we are in a word */
suc = backchar(FALSE, 1);
while (!inword() && suc)
suc = backchar(FALSE, 1);
curwp->w_doto = 0; /* and go to the B-O-Line */
/* and scan back until we hit a <NL><NL> or <NL><TAB>
or a <NL><SPACE> */
while (lback(curwp->w_dotp) != curbp->b_linep)
if (llength(curwp->w_dotp) != 0 &&
lgetc(curwp->w_dotp, curwp->w_doto) != TAB &&
lgetc(curwp->w_dotp, curwp->w_doto) != ' ')
curwp->w_dotp = lback(curwp->w_dotp);
else
break;
/* and then forward until we are in a word */
suc = forwchar(FALSE, 1);
while (suc && !inword())
suc = forwchar(FALSE, 1);
}
curwp->w_flag |= WFMOVE; /* force screen update */
return(TRUE);
}
PASCAL NEAR gotoeop(f, n) /* go forword to the end of the current paragraph
here we look for a <NL><NL> or <NL><TAB> or <NL><SPACE>
combination to delimit the beginning of a paragraph */
int f, n; /* default Flag & Numeric argument */
{
register int suc; /* success of last backchar */
if (n < 0) /* the other way...*/
return(gotobop(f, -n));
while (n-- > 0) { /* for each one asked for */
/* first scan forward until we are in a word */
suc = forwchar(FALSE, 1);
while (!inword() && suc)
suc = forwchar(FALSE, 1);
curwp->w_doto = 0; /* and go to the B-O-Line */
if (suc) /* of next line if not at EOF */
curwp->w_dotp = lforw(curwp->w_dotp);
/* and scan forword until we hit a <NL><NL> or <NL><TAB>
or a <NL><SPACE> */
while (curwp->w_dotp != curbp->b_linep) {
if (llength(curwp->w_dotp) != 0 &&
lgetc(curwp->w_dotp, curwp->w_doto) != TAB &&
lgetc(curwp->w_dotp, curwp->w_doto) != ' ')
curwp->w_dotp = lforw(curwp->w_dotp);
else
break;
}
/* and then backward until we are in a word */
suc = backchar(FALSE, 1);
while (suc && !inword()) {
suc = backchar(FALSE, 1);
}
curwp->w_doto = llength(curwp->w_dotp); /* and to the EOL */
}
curwp->w_flag |= WFMOVE; /* force screen update */
return(TRUE);
}
#endif
/*
* This routine, given a pointer to a LINE, and the current cursor goal
* column, return the best choice for the offset. The offset is returned.
* Used by "C-N" and "C-P".
*/
PASCAL NEAR getgoal(dlp)
register LINE *dlp;
{
register int c;
register int col;
register int newcol;
register int dbo;
col = 0;
dbo = 0;
while (dbo != llength(dlp)) {
c = lgetc(dlp, dbo);
newcol = col;
if (c == '\t')
newcol += -(newcol % tabsize) + (tabsize - 1);
else if (c<0x20 || c==0x7F)
++newcol;
++newcol;
if (newcol > curgoal)
break;
col = newcol;
++dbo;
}
return(dbo);
}
/*
* Scroll forward by a specified number of lines, or by a full page if no
* argument. Bound to "C-V". The "2" in the arithmetic on the window size is
* the overlap; this value is the default overlap value in ITS EMACS. Because
* this zaps the top line in the display window, we have to do a hard update.
*/
PASCAL NEAR forwpage(f, n)
register int n;
{
register LINE *lp;
#if KEEPPOS
int currow;
register LINE *lp1;
#endif
if (f == FALSE) {
n = curwp->w_ntrows - 2; /* Default scroll. */
if (n <= 0) /* Forget the overlap */
n = 1; /* if tiny window. */
} else if (n < 0)
return(backpage(f, -n));
#if CVMVAS
else /* Convert from pages */
n *= curwp->w_ntrows; /* to lines. */
#endif
lp = curwp->w_linep;
#if KEEPPOS
if ((lastflag&CFCPCN) == 0)
curgoal = getccol(FALSE);
/* flag this command as a line move */
thisflag |= CFCPCN;
lp1 = lp;
currow = 0;
while (lp1 != curwp->w_dotp ) {
currow++;
lp1 = lforw(lp1);
}
#endif
while (n-- && lp!=curbp->b_linep)
lp = lforw(lp);
curwp->w_linep = lp;
#if KEEPPOS
while (currow-- && lp!=curbp->b_linep) lp = lforw(lp);
curwp->w_doto = getgoal(lp);
#else
curwp->w_doto = 0;
#endif
curwp->w_dotp = lp;
curwp->w_flag |= WFHARD;
return(TRUE);
}
/*
* This command is like "forwpage", but it goes backwards. The "2", like
* above, is the overlap between the two windows. The value is from the ITS
* EMACS manual. Bound to "M-V". We do a hard update for exactly the same
* reason.
*/
PASCAL NEAR backpage(f, n)
register int f;
register int n;
{
register LINE *lp;
#if KEEPPOS
int currow;
register LINE *lp1;
#endif
if (f == FALSE) {
n = curwp->w_ntrows - 2; /* Default scroll. */
if (n <= 0) /* Don't blow up if the */
n = 1; /* window is tiny. */
} else if (n < 0)
return(forwpage(f, -n));
#if CVMVAS
else /* Convert from pages */
n *= curwp->w_ntrows; /* to lines. */
#endif
lp = curwp->w_linep;
#if KEEPPOS
if ((lastflag&CFCPCN) == 0)
curgoal = getccol(FALSE);
/* flag this command as a line move */
thisflag |= CFCPCN;
lp1 = lp;
currow = 0;
while (lp1 != curwp->w_dotp ) {
currow++;
lp1 = lforw(lp1);
}
#endif
while (n-- && lback(lp)!=curbp->b_linep)
lp = lback(lp);
curwp->w_linep = lp;
#if KEEPPOS
while (currow-- && lp!=curbp->b_linep) lp = lforw(lp);
curwp->w_doto = getgoal(lp);
#else
curwp->w_doto = 0;
#endif
curwp->w_dotp = lp;
curwp->w_flag |= WFHARD;
return(TRUE);
}
/*
* Set the mark in the current window to the value of "." in the window. No
* errors are possible. Bound to "M-.".
*/
PASCAL NEAR setmark(f, n)
{
/* make sure it is in range */
if (f == FALSE)
n = 0;
n %= NMARKS;
curwp->w_markp[n] = curwp->w_dotp;
curwp->w_marko[n] = curwp->w_doto;
mlwrite(TEXT9, n);
/* "[Mark %d set]" */
return(TRUE);
}
/*
* Remove the mark in the current window.
* Bound to ^X <space>
*/
PASCAL NEAR remmark(f, n)
{
/* make sure it is in range */
if (f == FALSE)
n = 0;
n %= NMARKS;
curwp->w_markp[n] = NULL;
curwp->w_marko[n] = 0;
mlwrite(TEXT10, n);
/* "[Mark %d removed]" */
return(TRUE);
}
/*
* Swap the values of "." and "mark" in the current window. This is pretty
* easy, bacause all of the hard work gets done by the standard routine
* that moves the mark about. The only possible error is "no mark". Bound to
* "C-X C-X".
*/
PASCAL NEAR swapmark(f, n)
{
register LINE *odotp;
register int odoto;
/* make sure it is in range */
if (f == FALSE)
n = 0;
n %= NMARKS;
if (curwp->w_markp[n] == NULL) {
mlwrite(TEXT11, n);
/* "No mark %d in this window" */
return(FALSE);
}
odotp = curwp->w_dotp;
odoto = curwp->w_doto;
curwp->w_dotp = curwp->w_markp[n];
curwp->w_doto = curwp->w_marko[n];
curwp->w_markp[n] = odotp;
curwp->w_marko[n] = odoto;
curwp->w_flag |= WFMOVE;
return(TRUE);
}
/*
* Goto a mark in the current window. This is pretty easy, bacause all of
* the hard work gets done by the standard routine that moves the mark
* about. The only possible error is "no mark". Bound to "M-^G".
*/
PASCAL NEAR gotomark(f, n)
int f, n; /* default and nemeric args */
{
/* make sure it is in range */
if (f == FALSE)
n = 0;
n %= NMARKS;
if (curwp->w_markp[n] == NULL) {
mlwrite(TEXT11, n);
/* "No mark %d in this window" */
return(FALSE);
}
curwp->w_dotp = curwp->w_markp[n];
curwp->w_doto = curwp->w_marko[n];
curwp->w_flag |= WFMOVE;
return(TRUE);
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.