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RANDOM.C
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C/C++ Source or Header
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1991-03-10
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11KB
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440 lines
/*
* Assorted commands.
* The file contains the command
* processors for a large assortment of unrelated
* commands. The only thing they have in common is
* that they are all command processors.
*/
#include "def.h"
/*
* Display a bunch of useful information about
* the current location of dot. The character under the
* cursor (in octal), the current line, row, and column, and
* approximate position of the cursor in the file (as a percentage)
* is displayed. The column position assumes an infinite position
* display; it does not truncate just because the screen does.
* This is normally bound to "C-X =".
*/
/*ARGSUSED*/
showcpos(f, n)
{
register LINE *clp;
register long nchar;
long cchar;
register int nline, row;
int cline, cbyte; /* Current line/char/byte */
int ratio;
clp = lforw(curbp->b_linep); /* Collect the data. */
nchar = 0;
nline = 0;
for (;;) {
++nline; /* Count this line */
if (clp == curwp->w_dotp) {
cline = nline; /* Mark line */
cchar = nchar + curwp->w_doto;
if (curwp->w_doto == llength(clp))
cbyte = '\n';
else
cbyte = lgetc(clp, curwp->w_doto);
}
nchar += llength(clp); /* Now count the chars */
clp = lforw(clp);
if (clp == curbp->b_linep) break;
nchar++; /* count the newline */
}
row = curwp->w_toprow + 1; /* Determine row. */
clp = curwp->w_linep;
while (clp!=curbp->b_linep && clp!=curwp->w_dotp) {
++row;
clp = lforw(clp);
}
/*NOSTRICT*/
ratio = nchar ? (100L*cchar) / nchar : 100;
ewprintf("Char: %c (0%o) point=%ld(%d%%) line=%d row=%d col=%d",
cbyte, cbyte, cchar, ratio, cline, row, getcolpos());
return TRUE;
}
getcolpos() {
register int col, i, c;
col = 1; /* Determine column. */
for (i=0; i<curwp->w_doto; ++i) {
c = lgetc(curwp->w_dotp, i);
if (c == '\t'
#ifdef NOTAB
&& !(curbp->b_flag & BFNOTAB)
#endif
) {
col |= 0x07;
++col;
} else if (ISCTRL(c) != FALSE)
++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.
*/
/*ARGSUSED*/
twiddle(f, n)
{
register LINE *dotp;
register int doto;
register int cr;
VOID lchange();
dotp = curwp->w_dotp;
doto = curwp->w_doto;
if(doto==llength(dotp)) {
if(--doto<=0) return FALSE;
} else {
if(doto==0) return FALSE;
++curwp->w_doto;
}
cr = lgetc(dotp, doto--);
lputc(dotp, doto+1, lgetc(dotp, doto));
lputc(dotp, doto, cr);
lchange(WFEDIT);
return TRUE;
}
/*
* 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".
*/
/*ARGSUSED*/
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 | FFRAND, n); /* of them all. */
return s;
}
/*
* Insert a newline.
* 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.
*/
/*ARGSUSED*/
newline(f, n)
{
register LINE *lp;
register int s;
if (n < 0) return FALSE;
while (n--) {
lp = curwp->w_dotp;
if (llength(lp) == curwp->w_doto
&& lforw(lp) != curbp->b_linep
&& llength(lforw(lp)) == 0) {
if ((s=forwchar(FFRAND, 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.
*/
/*ARGSUSED*/
deblank(f, n)
{
register LINE *lp1;
register LINE *lp2;
register RSIZE nld;
lp1 = curwp->w_dotp;
while (llength(lp1)==0 && (lp2=lback(lp1))!=curbp->b_linep)
lp1 = lp2;
lp2 = lp1;
nld = (RSIZE) 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((RSIZE)nld, KNONE);
}
/*
* Delete any whitespace around dot, then insert a space.
*/
justone(f, n) {
(VOID) delwhite(f, n);
return linsert(1, ' ');
}
/*
* Delete any whitespace around dot.
*/
/*ARGSUSED*/
delwhite(f, n)
{
register int col, c, s;
col = curwp->w_doto;
while (((c = lgetc(curwp->w_dotp, col)) == ' ' || c == '\t')
&& col < llength(curwp->w_dotp))
++col;
do {
if (curwp->w_doto == 0) {
s = FALSE;
break;
}
if ((s = backchar(FFRAND, 1)) != TRUE) break;
} while ((c = lgetc(curwp->w_dotp, curwp->w_doto)) == ' ' || c == '\t');
if (s == TRUE) (VOID) forwchar(FFRAND, 1);
(VOID) ldelete((RSIZE)(col - curwp->w_doto), KNONE);
return TRUE;
}
/*
* 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".
*/
/*ARGSUSED*/
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 || ((
#ifdef NOTAB
curbp->b_flag&BFNOTAB) ?
linsert(nicol, ' ') == FALSE : (
#endif
((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".
*/
/*ARGSUSED*/
forwdel(f, n)
{
if (n < 0)
return backdel(f | FFRAND, -n);
if (f & FFARG) { /* Really a kill. */
if ((lastflag&CFKILL) == 0)
kdelete();
thisflag |= CFKILL;
}
return ldelete((RSIZE) n, (f & FFARG) ? KFORW : KNONE);
}
/*
* 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.
*/
/*ARGSUSED*/
backdel(f, n)
{
register int s;
if (n < 0)
return forwdel(f | FFRAND, -n);
if (f & FFARG) { /* Really a kill. */
if ((lastflag&CFKILL) == 0)
kdelete();
thisflag |= CFKILL;
}
if ((s=backchar(f | FFRAND, n)) == TRUE)
s = ldelete((RSIZE) n, (f & FFARG) ? KFORW : KNONE);
return s;
}
/*
* Kill line. 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