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random.c
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C/C++ Source or Header
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1986-05-22
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14KB
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483 lines
/*
* 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) */
/*
* Toggle word wrap.
*/
togglewordwrap(f, n)
{
if( wordwrap) {
wordwrap = FALSE;
mlwrite( "Word wrap off");
} else {
wordwrap = TRUE;
mlwrite( "Word wrap on");
}
return(TRUE);
}
/*
* Toggle autoindent
*/
toggleautoindent(f, n)
{
if( autoindent )
{
autoindent = FALSE;
mlwrite( "Autoindentation is off");
}
else
{
autoindent = TRUE;
mlwrite( "Autoindentation is on");
}
return(TRUE);
}
/*
* Set fill column (Right Margin) and Left margin
*/
setfillcol(f, n)
{
register int c;
register char *prompt;
if ( f )
prompt = "Right Margin: %d";
else
prompt = "Left Margin : %d";
n = 0;
mlwrite( prompt, n );
while ( (c=getkey()) >='0' && c<='9' )
{
n = 10*n + c - '0';
mlwrite( prompt, n );
}
if ( f )
fillcol = n;
else
LeftMargin = 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 long nbc;
register int cbo;
register int cac;
register int ratio;
register short col;
clp = lforw(curbp->b_linep); /* Grovel the data. */
cbo = 0;
nch = 0;
for (;;) {
if (clp==curwp->w_dotp && cbo==curwp->w_doto) {
nbc = nch;
if (cbo == llength(clp))
cac = '\n';
else
cac = lgetc(clp, cbo);
}
if (cbo == llength(clp)) {
if (clp == curbp->b_linep)
break;
clp = lforw(clp);
cbo = 0;
} else
++cbo;
++nch;
}
col = getccol(FALSE); /* Get real column. */
ratio = 0; /* Ratio before dot. */
if (nch != 0)
ratio = (100L*nbc) / nch;
mlwrite("row=%d col=%d CH=0x%x .=%D (%d%% of %D)",
currow+1, col+1, cac, nbc, ratio, nch);
return (TRUE);
}
/*
* Return current column. Stop at first non-blank given TRUE argument.
*/
getccol(bflg)
int bflg;
{
register short c, i, col;
col = 0;
for (i=0; i<curwp->w_doto; ++i)
{
c = lgetc(curwp->w_dotp, i);
if (bflg && c != ' ' && c != '\t')
break;
if (c == '\t')
col |= 0x07;
else if (c<0x20 || c==0x7F)
++col;
++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 = (*term.t_getchar)();
if (n < 0)
return (FALSE);
if (n == 0)
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 == 0 || 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 == 0)
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(f, n)
{
int nicol;
register LINE *lp;
register int s;
if (n < 0)
return (FALSE);
while (n--) {
lp = curwp->w_dotp;
if (llength(lp) == curwp->w_doto
&& lp != curbp->b_linep
&& llength(lforw(lp)) == 0) {
if ((s=forwchar(FALSE, 1)) != TRUE)
return (s);
} else 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)==0 && (lp2=lback(lp1))!=curbp->b_linep)
lp1 = lp2;
lp2 = lp1;
nld = 0;
while ((lp2=lforw(lp2))!=curbp->b_linep && llength(lp2)==0)
++nld;
if (nld == 0)
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--) {
nicol = 0;
for (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 )
return (FALSE);
if ( autoindent )
{
if ( ((i=nicol/8)!=0 && linsert(i, '\t')==FALSE) ||
((i=nicol%8)!=0 && 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) == 0)
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) == 0)
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) == 0) /* Clear kill buffer if */
kdelete(); /* last wasn't a kill. */
thisflag |= CFKILL;
if (f == FALSE) {
chunk = llength(curwp->w_dotp)-curwp->w_doto;
if (chunk == 0)
chunk = 1;
} else if (n == 0) {
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 (newline(FALSE, 1) == FALSE)
return (FALSE);
} else {
if (linsert(1, c) == FALSE)
return (FALSE);
}
++i;
}
}
return (TRUE);
}
/*
* Yank text back from the kill buffer and into a file. This is really easy.
* its just yank() that goes to a file
*/
#define NAMELEN 30
fileyank(f, n)
{
register long len;
register short i;
register short c;
unsigned char filename[NAMELEN];
extern FILE *ffp;
if (n < 0)
return (FALSE);
if ( mlreply( "Yank to file: ", filename, NAMELEN) != TRUE)
return (FALSE);
if ( ffwopen( filename ) == FIOERR )
return (FALSE);
len = 0L;
do
{
for ( i = 0; ( i < 512 ) && ( (c=kremove(len+i)) >= 0 ); i++)
fputc( (unsigned char) c, ffp);
len += i;
if (ferror(ffp))
{
mlwrite("Write I/O error");
i = 0; /* abort by short circuit */
}
}
while ( i == 512 );
ffclose();
return (TRUE);
}