4.3BSD-Reno/src/contrib/jove/disp.c
/***************************************************************************
* This program is Copyright (C) 1986, 1987, 1988 by Jonathan Payne. JOVE *
* is provided to you without charge, and with no warranty. You may give *
* away copies of JOVE, including sources, provided that this notice is *
* included in all the files. *
***************************************************************************/
#include "jove.h"
#include "ctype.h"
#include "termcap.h"
#include "chars.h"
#include "fp.h"
#include "disp.h"
#if defined(IPROCS)
# include "iproc.h"
#endif
#ifdef MAC
# include "mac.h"
#else
# ifdef STDARGS
# include <stdarg.h>
# else
# include <varargs.h>
# endif
# include <sys/stat.h>
#endif
#include <signal.h>
private void
#ifdef ID_CHAR
DeTab proto((int, char *, char *, size_t, int)),
DelChar proto((int, int, int)),
InsChar proto((int, int, int, char *)),
#endif
DoIDline proto((int)),
do_cl_eol proto((int)),
ModeLine proto((Window *)),
GotoDot proto((void)),
UpdLine proto((int)),
UpdWindow proto((Window *, int));
#ifdef MSDOS
extern void dobell proto((int x));
#else
private void dobell proto((int x));
#endif
private int
#ifdef ID_CHAR
IDchar proto ((char *, int, int)),
NumSimilar proto ((char *, char *, int)),
IDcomp proto ((char *, char *, int)),
OkayDelete proto ((int, int, int)),
OkayInsert proto ((int, int)),
#endif
AddLines proto((int, int)),
DelLines proto((int, int)),
UntilEqual proto((int));
int DisabledRedisplay = NO;
/* Kludge windows gets called by the routines that delete lines from the
buffer. If the w->w_line or w->w_top are deleted and this procedure
is not called, the redisplay routine will barf. */
void
ChkWindows(line1, line2)
Line *line1;
register Line *line2;
{
register Window *w = fwind;
register Line *lp;
do {
for (lp = line1->l_next; lp != line2->l_next; lp = lp->l_next) {
if (lp == w->w_top)
w->w_flags |= W_TOPGONE;
if (lp == w->w_line)
w->w_flags |= W_CURGONE;
}
w = w->w_next;
} while (w != fwind);
}
private int RingBell; /* So if we have a lot of errors ...
ring the bell only ONCE */
void
redisplay()
{
register Window *w = fwind;
int lineno,
done_ID = NO,
i;
register struct scrimage *des_p,
*phys_p;
if (DisabledRedisplay == YES)
return;
curwind->w_line = curwind->w_bufp->b_dot;
curwind->w_char = curwind->w_bufp->b_char;
#ifdef MAC
InputPending = 0;
#else
if ((InputPending = charp()) != '\0') /* calls CheckEvent, which could */
return; /* result in a call to rediplay(). We don't want that. */
#endif
#ifdef JOB_CONTROL
if (UpdFreq)
SigHold(SIGALRM);
#endif
if (RingBell) {
dobell(1);
RingBell = 0;
}
AbortCnt = BufSize; /* initialize this now */
if (UpdMesg)
DrawMesg(YES);
for (lineno = 0, w = fwind; lineno < ILI; w = w->w_next) {
UpdWindow(w, lineno);
lineno += w->w_height;
}
UpdModLine = 0; /* Now that we've called update window, we can
assume that the modeline will be updated. But
if while redrawing the modeline the user types
a character, ModeLine() is free to set this on
again so that the modeline will be fully drawn
at the next redisplay. */
des_p = DesiredScreen;
phys_p = PhysScreen;
for (i = 0; i < ILI; i++, des_p++, phys_p++) {
if (!done_ID && (des_p->s_id != phys_p->s_id)) {
DoIDline(i);
done_ID = YES;
}
if ((des_p->s_flags & (DIRTY | L_MOD)) ||
(des_p->s_id != phys_p->s_id) ||
(des_p->s_vln != phys_p->s_vln) ||
(des_p->s_offset != phys_p->s_offset))
UpdLine(i);
if (InputPending)
goto ret;
}
if (Asking) {
Placur(LI - 1, min(CO - 2, calc_pos(mesgbuf, Asking)));
/* Nice kludge */
flusho();
} else
GotoDot();
ret:
#ifdef JOB_CONTROL
if (UpdFreq)
SigRelse(SIGALRM);
#else
; /* yuck */
#endif
#ifdef MAC
if(Windchange) docontrols();
#endif /* MAC */
}
#ifndef IBMPC
private void
dobell(n)
int n;
{
while (--n >= 0) {
#ifndef MAC
if (VisBell && VB)
putstr(VB);
else
putpad(BL, 1);
#else
SysBeep(5);
#endif
}
flusho();
}
#endif /* IBMPC */
/* find_pos() returns the position on the line, that C_CHAR represents
in LINE */
int
find_pos(line, c_char)
Line *line;
int c_char;
{
return calc_pos(lcontents(line), c_char);
}
int
calc_pos(lp, c_char)
register char *lp;
register int c_char;
{
register int pos = 0;
register int c;
while ((--c_char >= 0) && ((c = *lp++) & CHARMASK) != 0) {
if (c == '\t')
pos += (tabstop - (pos % tabstop));
else if (isctrl(c))
pos += 2;
else
pos += 1;
}
return pos;
}
int UpdModLine = 0,
UpdMesg = 0;
private void
DoIDline(start)
int start;
{
register struct scrimage *des_p = &DesiredScreen[start];
struct scrimage *phys_p = &PhysScreen[start];
register int i,
j;
/* Some changes have been made. Try for insert or delete lines.
If either case has happened, Addlines and/or DelLines will do
necessary scrolling, also CONVERTING PhysScreen to account for the
physical changes. The comparison continues from where the
insertion/deletion takes place; this doesn't happen very often,
usually it happens with more than one window with the same
buffer. */
if (!CanScroll)
return; /* We should never have been called! */
for (i = start; i < ILI; i++, des_p++, phys_p++)
if (des_p->s_id != phys_p->s_id)
break;
for (; i < ILI; i++) {
for (j = i + 1; j < ILI; j++) {
des_p = &DesiredScreen[j];
phys_p = &PhysScreen[j];
if (des_p->s_id != 0 && des_p->s_id == phys_p->s_id)
break;
if (des_p->s_id == PhysScreen[i].s_id) {
if (des_p->s_id == 0)
continue;
if (AddLines(i, j - i)) {
DoIDline(j);
return;
}
break;
}
if ((des_p = &DesiredScreen[i])->s_id == phys_p->s_id) {
if (des_p->s_id == 0)
continue;
if (DelLines(i, j - i)) {
DoIDline(i);
return;
}
break;
}
}
}
}
/* Make DesiredScreen reflect what the screen should look like when we are done
with the redisplay. This deals with horizontal scrolling. Also makes
sure the current line of the Window is in the window. */
int ScrollAll = NO;
private void
UpdWindow(w, start)
register Window *w;
int start;
{
Line *lp;
int i,
upper, /* top of window */
lower, /* bottom of window */
strt_col, /* starting print column of current line */
ntries = 0; /* # of tries at updating window */
register struct scrimage *des_p,
*phys_p;
Buffer *bp = w->w_bufp;
retry:
if (w->w_flags & W_CURGONE) {
w->w_line = bp->b_dot;
w->w_char = bp->b_char;
}
if (w->w_flags & W_TOPGONE)
CentWind(w); /* reset topline of screen */
w->w_flags &= ~(W_CURGONE | W_TOPGONE);
/* make sure that the current line is in the window */
upper = start;
lower = upper + w->w_height - 1; /* don't include modeline */
for (i = upper, lp = w->w_top; i < lower && lp != 0; lp = lp->l_next, i++)
if (lp == w->w_line)
break;
if (i == lower || lp == 0) {
ntries += 1;
if (ntries == 1) {
CalcWind(w);
goto retry;
} else if (ntries == 2) {
w->w_top = w->w_line = w->w_bufp->b_first;
writef("\rERROR in redisplay: I got hopelessly lost!");
dobell(2);
goto retry;
} else if (ntries == 3) {
writef("\n\rOops, still lost, quitting ...\r\n");
finish(1);
}
}
/* first do some calculations for the current line */
{
int diff = (w->w_flags & W_NUMLINES) ? 8 : 0,
end_col;
strt_col = (ScrollAll == YES) ? w->w_LRscroll :
PhysScreen[i].s_offset;
end_col = strt_col + (CO - 2) - diff;
/* Right now we are displaying from strt_col to
end_col of the buffer line. These are PRINT
columns, not actual characters. */
w->w_dotcol = find_pos(w->w_line, w->w_char);
/* if the new dotcol is out of range, reselect
a horizontal window */
if ((PhysScreen[i].s_offset == -1) ||
(w->w_dotcol < strt_col) ||
(w->w_dotcol >= end_col)) {
if (w->w_dotcol < ((CO - 2) - diff))
strt_col = 0;
else
strt_col = w->w_dotcol - (CO / 2);
if (ScrollAll == YES) {
if (w->w_LRscroll != strt_col)
UpdModLine = YES;
w->w_LRscroll = strt_col;
}
}
w->w_dotline = i;
w->w_dotcol += diff;
}
des_p = &DesiredScreen[upper];
phys_p = &PhysScreen[upper];
for (i = upper, lp = w->w_top; lp != 0 && i < lower; i++, des_p++, phys_p++, lp = lp->l_next) {
des_p->s_window = w;
des_p->s_lp = lp;
des_p->s_id = lp->l_dline & ~DIRTY;
des_p->s_flags = isdirty(lp) ? L_MOD : 0;
if (w->w_flags & W_NUMLINES)
des_p->s_vln = w->w_topnum + (i - upper);
else
des_p->s_vln = 0;
if (lp == w->w_line)
des_p->s_offset = strt_col;
else
des_p->s_offset = w->w_LRscroll;
}
/* Is structure assignment faster than copy each field separately? */
if (i < lower) {
static const struct scrimage dirty_plate = { 0, DIRTY, 0, 0, 0, 0 },
clean_plate = { 0, 0, 0, 0, 0, 0 };
for (; i < lower; i++, des_p++, phys_p++)
if (phys_p->s_id != 0)
*des_p = dirty_plate;
else
*des_p = clean_plate;
}
des_p->s_window = w;
des_p->s_flags = 0;
if (((des_p->s_id = (int) w->w_bufp) != phys_p->s_id) || UpdModLine)
des_p->s_flags = MODELINE | DIRTY;
#ifdef MAC
if (UpdModLine)
Modechange = 1;
if (w == curwind && w->w_control)
SetScrollBar(w->w_control);
#endif
}
/* Write whatever is in mesgbuf (maybe we are Asking, or just printed
a message). Turns off the UpdateMesg line flag. */
void
DrawMesg(abortable)
int abortable;
{
#ifndef MAC /* same reason as in redisplay() */
if (charp())
return;
#endif
i_set(ILI, 0);
if (swrite(mesgbuf, NO, abortable)) {
cl_eol();
UpdMesg = 0;
}
flusho();
}
/* Goto the current position in the current window. Presumably redisplay()
has already been called, and curwind->{w_dotline,w_dotcol} have been set
correctly. */
private void
GotoDot()
{
if (InputPending)
return;
Placur(curwind->w_dotline, curwind->w_dotcol -
PhysScreen[curwind->w_dotline].s_offset);
flusho();
}
private int
UntilEqual(start)
register int start;
{
register struct scrimage *des_p = &DesiredScreen[start],
*phys_p = &PhysScreen[start];
while ((start < ILI) && (des_p->s_id != phys_p->s_id)) {
des_p += 1;
phys_p += 1;
start += 1;
}
return start;
}
/* Calls the routine to do the physical changes, and changes PhysScreen to
reflect those changes. */
private int
AddLines(at, num)
register int at,
num;
{
register int i;
int bottom = UntilEqual(at + num);
if (num == 0 || num >= ((bottom - 1) - at))
return NO; /* we did nothing */
v_ins_line(num, at, bottom - 1);
/* Now change PhysScreen to account for the physical change. */
for (i = bottom - 1; i - num >= at; i--)
PhysScreen[i] = PhysScreen[i - num];
for (i = 0; i < num; i++)
PhysScreen[at + i].s_id = 0;
return YES; /* we did something */
}
private int
DelLines(at, num)
register int at,
num;
{
register int i;
int bottom = UntilEqual(at + num);
if (num == 0 || num >= ((bottom - 1) - at))
return NO;
v_del_line(num, at, bottom - 1);
for (i = at; num + i < bottom; i++)
PhysScreen[i] = PhysScreen[num + i];
for (i = bottom - num; i < bottom; i++)
PhysScreen[i].s_id = 0;
return YES;
}
/* Update line linenum in window w. Only set PhysScreen to DesiredScreen
if the swrite or cl_eol works, that is nothing is interupted by
characters typed. */
private void
UpdLine(linenum)
register int linenum;
{
register struct scrimage *des_p = &DesiredScreen[linenum];
register Window *w = des_p->s_window;
i_set(linenum, 0);
if (des_p->s_flags & MODELINE)
ModeLine(w);
else if (des_p->s_id) {
des_p->s_lp->l_dline &= ~DIRTY;
des_p->s_flags &= ~(DIRTY | L_MOD);
#ifdef ID_CHAR
if (!UseIC && (w->w_flags & W_NUMLINES))
#else
if (w->w_flags & W_NUMLINES)
#endif
(void) swrite(sprint("%6d ", des_p->s_vln), NO, YES);
#ifdef ID_CHAR
if (UseIC) {
char outbuf[MAXCOLS],
*lptr;
int fromcol = (w->w_flags & W_NUMLINES) ? 8 : 0;
if (w->w_flags & W_NUMLINES)
swritef(outbuf, "%6d ", des_p->s_vln);
lptr = lcontents(des_p->s_lp);
DeTab(des_p->s_offset, lptr, outbuf + fromcol,
(sizeof outbuf) - 1 - fromcol,
des_p->s_window->w_flags & W_VISSPACE);
if (IDchar(outbuf, linenum, 0))
PhysScreen[linenum] = *des_p;
else if (i_set(linenum, 0), swrite(outbuf, NO, YES))
do_cl_eol(linenum);
else
PhysScreen[linenum].s_id = -1;
} else
#endif /* ID_CHAR */
if (BufSwrite(linenum))
do_cl_eol(linenum);
else
PhysScreen[linenum].s_id = -1;
} else if (PhysScreen[linenum].s_id) /* not the same ... make sure */
do_cl_eol(linenum);
}
private void
do_cl_eol(linenum)
register int linenum;
{
cl_eol();
PhysScreen[linenum] = DesiredScreen[linenum];
}
#ifdef ID_CHAR
/* From here to the end of the file is code that tries to utilize the
insert/delete character feature on some terminals. It is very confusing
and not so well written code, AND there is a lot of it. You may want
to use the space for something else. */
int IN_INSmode = 0;
int UseIC;
int DClen,
MDClen,
IClen,
MIClen,
IMlen,
CElen;
void
disp_opt_init()
{
DClen = DC ? strlen(DC) : 0;
MDClen = M_DC ? strlen(M_DC) : 9999;
IClen = IC ? strlen(IC) : 0;
MIClen = M_IC ? strlen(M_IC) : 9999;
IMlen = IM ? strlen(IM) : 0;
CElen = CE ? strlen(CE) : 0;
UseIC = (IC || IM || M_IC);
}
void
INSmode(on)
int on;
{
if (on && !IN_INSmode) {
putpad(IM, 1);
IN_INSmode = YES;
} else if (!on && IN_INSmode) {
putpad(EI, 1);
IN_INSmode = NO;
}
}
private void
DeTab(s_offset, buf, outbuf, limit, visspace)
int s_offset;
register char *buf;
char *outbuf;
size_t limit;
int visspace;
{
register char *phys_p = outbuf,
c;
register int pos = 0;
char *limitp = &outbuf[limit];
#define OkayOut(ch) { \
if ((pos++ >= s_offset) && (phys_p < limitp)) \
*phys_p++ = (ch); \
}
while ((c = *buf++) != '\0') {
if (c == '\t') {
int nchars = (tabstop - (pos % tabstop));
if (visspace) {
OkayOut('>');
nchars -= 1;
}
while (--nchars >= 0)
OkayOut(' ');
} else if (isctrl(c)) {
OkayOut('^');
OkayOut(c == 0177 ? '?' : c + '@');
} else {
if (visspace && c == ' ')
c = '_';
OkayOut(c);
}
if (pos - s_offset >= CO) {
phys_p = &outbuf[CO - 1];
*phys_p++ = '!';
break;
}
}
*phys_p = 0;
#undef OkayOut
}
/* ID character routines full of special cases and other fun stuff like that.
It actually works though ...
Returns Non-Zero if you are finished (no differences left). */
private int
IDchar(new, lineno, col)
register char *new;
int lineno,
col;
{
register int i;
int j,
oldlen,
NumSaved;
register struct screenline *sline = &Screen[lineno];
oldlen = sline->s_length - sline->s_line;
for (i = col; i < oldlen && new[i] != 0; i++)
if (sline->s_line[i] != new[i])
break;
if (new[i] == 0 || i == oldlen)
return (new[i] == 0 && i == oldlen);
for (j = i + 1; j < oldlen && new[j]; j++) {
if (new[j] == sline->s_line[i]) {
NumSaved = IDcomp(new + j, sline->s_line + i,
(int)strlen(new)) + NumSimilar(new + i,
sline->s_line + i, j - i);
if (OkayInsert(NumSaved, j - i)) {
InsChar(lineno, i, j - i, new);
return(IDchar(new, lineno, j));
}
}
}
for (j = i + 1; j < oldlen && new[i]; j++) {
if (new[i] == sline->s_line[j]) {
NumSaved = IDcomp(new + i, sline->s_line + j,
oldlen - j);
if (OkayDelete(NumSaved, j - i, new[oldlen] == 0)) {
DelChar(lineno, i, j - i);
return(IDchar(new, lineno, i));
}
}
}
return 0;
}
private int
NumSimilar(s, t, n)
register char *s,
*t;
int n;
{
register int num = 0;
while (n--)
if (*s++ == *t++)
num += 1;
return num;
}
private int
IDcomp(s, t, len)
register char *s,
*t;
int len;
{
register int i;
int num = 0,
nonspace = 0;
char c;
for (i = 0; i < len; i++) {
if ((c = *s++) != *t++)
break;
if (c != ' ')
nonspace++;
if (nonspace)
num += 1;
}
return num;
}
private int
OkayDelete(Saved, num, samelength)
int Saved,
num,
samelength;
{
/* If the old and the new are the same length, then we don't
* have to clear to end of line. We take that into consideration.
*/
return ((Saved + (!samelength ? CElen : 0))
> min(MDClen, DClen * num));
}
private int
OkayInsert(Saved, num)
int Saved,
num;
{
register int n = 0;
if (IC) /* Per character prefixes */
n = min(num * IClen, MIClen);
if (IM && !IN_INSmode) {
/* Good terminal. Fewer characters in this case */
n += IMlen;
}
n += num; /* The characters themselves */
return Saved > n;
}
private void
DelChar(lineno, col, num)
int lineno,
col,
num;
{
register char *from,
*to;
register int i;
struct screenline *sp = (&Screen[lineno]);
Placur(lineno, col);
if (M_DC && num > 1) {
putargpad(M_DC, num, num);
} else {
for (i = num; --i >= 0; )
putpad(DC, 1);
}
to = sp->s_line + col;
from = to + num;
byte_copy(from, to, (size_t) (sp->s_length - from + 1));
clrline(sp->s_length - num, sp->s_length);
sp->s_length -= num;
}
private void
InsChar(lineno, col, num, new)
int lineno,
col,
num;
char *new;
{
register char *sp1,
*sp2, /* To push over the array. */
*sp3; /* Last character to push over. */
int i;
i_set(lineno, 0);
sp2 = Curline->s_length + num;
if (sp2 >= cursend) {
i_set(lineno, CO - num - 1);
cl_eol();
sp2 = cursend - 1;
}
Curline->s_length = sp2;
sp1 = sp2 - num;
sp3 = Curline->s_line + col;
while (sp1 >= sp3)
*sp2-- = *sp1--;
new += col;
byte_copy(new, sp3, (size_t) num);
/* The internal screen is correct, and now we have to do
the physical stuff. */
Placur(lineno, col);
if (IM) {
if (!IN_INSmode)
INSmode(1);
} else if (M_IC && num > 1) {
putargpad(M_IC, num, num);
} else if (IC) {
for (i = 0; i < num; i++)
putpad(IC, 1);
}
for (i = 0; i < num; i++) {
jputchar(new[i]);
if (IN_INSmode)
putpad(IP, 1);
}
CapCol += num;
}
#endif /* ID_CHAR */
#ifdef UNIX /* obviously ... no mail today if not Unix*/
/* chkmail() returns nonzero if there is new mail since the
last time we checked. */
char Mailbox[FILESIZE]; /* initialized in main */
int MailInt = 60; /* check no more often than 60 seconds */
#ifdef BIFF
int BiffChk = NO; /* whether to turn off biff while in JOVE */
#endif
int
chkmail(force)
int force;
{
time_t now;
static int state = NO; /* assume unknown */
static time_t last_chk = 0,
mbox_time = 0;
struct stat stbuf;
if (MailInt == 0)
return NO;
time(&now);
if ((force == NO) && (now < last_chk + MailInt))
return state;
last_chk = now;
if (stat(Mailbox, &stbuf) < 0) {
state = NO; /* no mail */
return NO;
}
if (((stbuf.st_atime > stbuf.st_mtime) &&
(stbuf.st_atime > mbox_time)) ||
(stbuf.st_size == 0)) {
mbox_time = stbuf.st_atime;
state = NO;
} else if (stbuf.st_mtime > mbox_time) {
if (mbox_time > 0)
dobell(2); /* announce the change */
mbox_time = stbuf.st_mtime;
state = YES;
}
return state;
}
#endif /* UNIX */
/* Print the mode line. */
private char *mode_p,
*mend_p;
int BriteMode = 1; /* modeline should standout */
private void
mode_app(str)
register const char *str;
{
while ((mode_p < mend_p) && (*mode_p++ = *str++)!='\0')
;
mode_p -= 1; /* back over the null */
}
char ModeFmt[120] = "%3c %w %[%sJOVE (%M) Buffer: %b \"%f\" %]%s%m*- %((%t)%s%)%e";
private void
ModeLine(w)
register Window *w;
{
int n,
ign_some = NO,
glue = 0;
char line[MAXCOLS],
*fmt = ModeFmt,
fillc,
c;
register Buffer *thisbuf = w->w_bufp;
register Buffer *bp;
mode_p = line;
mend_p = &line[(sizeof line) - 1];
#ifdef IBMPC
/* very subtle - don't mess up attributes too much */
fillc = '-';
#else /* !IBMPC */
# ifdef MAC
fillc = '_'; /* looks better on a Mac */
# else /* !MAC */
if (SO == 0)
BriteMode = 0;
fillc = BriteMode ? ' ' : '-';
# endif /* !MAC */
#endif /* !IBMPC */
while ((c = *fmt++)!='\0' && mode_p<mend_p) {
if (c != '%') {
if (c == '\\')
if ((c = *fmt++) == '\0')
break;
if (!ign_some)
*mode_p++ = c;
continue;
}
if ((c = *fmt++) == '\0') /* char after the '%' */
break;
if (ign_some && c != ')')
continue;
n = 1;
if (c >= '0' && c <= '9') {
n = 0;
while (c >= '0' && c <= '9') {
n = n * 10 + (c - '0');
c = *fmt++;
}
if (c == '\0')
break;
}
switch (c) {
case '(':
if (w->w_next != fwind) /* Not bottom window. */
ign_some = YES;
break;
case ')':
ign_some = NO;
break;
case '[':
case ']':
for (n=RecDepth; n>0 && mode_p<mend_p; n--)
*mode_p++ = c;
break;
#ifdef UNIX
case 'C': /* check mail here */
if (chkmail(NO) == YES)
mode_app("[New mail]");
break;
#endif /* UNIX */
case 'M':
{
static const char *const mmodes[] = {
"Fundamental ",
"Text ",
"C ",
#ifdef LISP
"Lisp ",
#endif
0
};
mode_app(mmodes[thisbuf->b_major]);
if (BufMinorMode(thisbuf, Fill))
mode_app("Fill ");
if (BufMinorMode(thisbuf, Abbrev))
mode_app("Abbrev ");
if (BufMinorMode(thisbuf, OverWrite))
mode_app("OvrWt ");
if (BufMinorMode(thisbuf, Indent))
mode_app("AI ");
if (BufMinorMode(thisbuf, ReadOnly))
mode_app("RO ");
if (InMacDefine)
mode_app("Def ");
mode_p -= 1; /* Back over the extra space. */
break;
}
case 'c':
while (--n>=0 && mode_p<mend_p)
*mode_p++ = fillc;
break;
case 'd': /* print working directory */
mode_app(pr_name(pwd(), YES));
break;
case 'e': /* stretchable glue */
*mode_p++ = '\0'; /* glue marker */
glue++;
break;
case 'b':
mode_app(thisbuf->b_name);
break;
case 'f':
case 'F':
if (thisbuf->b_fname == 0)
mode_app("[No file]");
else {
if (c == 'f')
mode_app(pr_name(thisbuf->b_fname, YES));
else
mode_app(basename(thisbuf->b_fname));
}
break;
#ifdef LOAD_AV
case 'l':
{
double theavg;
char minibuf[10];
get_la(&theavg);
theavg += .005; /* round to nearest .01 */
swritef(minibuf, "%d.%02d",
(int) theavg,
(int)((theavg - (int) theavg) * 100));
mode_app(minibuf);
break;
}
#endif
case 'm':
{
char yea = (*fmt == '\0') ? '*' : *fmt++;
char nay = (*fmt == '\0') ? ' ' : *fmt++;
*mode_p++ = IsModified(w->w_bufp) ? yea : nay;
break;
}
case 'n':
{
char tmp[16];
for (bp = world, n = 1; bp != 0; bp = bp->b_next, n++)
if (bp == thisbuf)
break;
swritef(tmp, "%d", n);
mode_app(tmp);
break;
}
#ifdef IPROCS
case 'p':
if (thisbuf->b_type == B_PROCESS) {
char tmp[40];
Process *p = thisbuf->b_process;
swritef(tmp, "(%s%s)",
((p == 0 || p->p_dbx_mode == NO)
? "" : "DBX "),
((p == 0) ? "No process" :
pstate(p)));
mode_app(tmp);
}
break;
#endif
case 's':
if (mode_p[-1] != ' ')
*mode_p++ = ' ';
break;
case 't':
{
char timestr[12];
mode_app(get_time((time_t *) 0, timestr, 11, 16));
break;
}
case 'w':
if (w->w_LRscroll > 0)
mode_app(">");
break;
}
}
/* Glue (Knuth's term) is a field that expands to fill
* any leftover space. Multiple glue fields compete
* on an equal basis. This is a generalization of a
* mechanism to allow centring and right-justification.
* The original meaning of %e (fill the rest of the
* line) has also been generalized. %e can now
* meaningfully be used 0 or more times.
*/
if (glue) {
/* 2 space pad plus padding for magic cookies */
register char *to = &line[CO - 2 - (2 * SG)],
*from = mode_p;
if (to < from)
to = from;
mode_p = to;
while (from != line) {
if ((*--to = *--from) == '\0') {
register int portion = (to-from) / glue;
glue--;
*to = fillc;
while (--portion >= 0)
*--to = fillc;
}
}
}
*mode_p = 0;
/* Highlight mode line. */
if (BriteMode) {
#ifdef ID_CHAR
if (IN_INSmode)
INSmode(0);
#endif
SO_on();
}
if (swrite(line, BriteMode, YES))
do_cl_eol(i_line);
else
UpdModLine = 1;
if (BriteMode)
SO_off();
}
private void
v_clear(line1, line2)
register int line1;
int line2;
{
register struct scrimage *phys_p, *des_p;
phys_p = &PhysScreen[line1];
des_p = &DesiredScreen[line1];
while (line1 <= line2) {
i_set(line1, 0);
cl_eol();
phys_p->s_id = des_p->s_id = 0;
phys_p += 1;
des_p += 1;
line1 += 1;
}
}
/* This tries to place the current line of the current window in the
center of the window, OR to place it at the arg'th line of the window.
This also causes the horizontal position of the line to be centered,
if the line needs scrolling, or moved all the way back to the left,
if that's possible. */
void
RedrawDisplay()
{
int line;
Line *newtop = prev_line((curwind->w_line = curline), is_an_arg() ?
arg_value() : HALF(curwind));
if ((line = in_window(curwind, curwind->w_line)) != -1)
PhysScreen[line].s_offset = -1;
if (newtop == curwind->w_top)
v_clear(FLine(curwind), FLine(curwind) + SIZE(curwind));
else
SetTop(curwind, newtop);
}
void
ClAndRedraw()
{
cl_scr(YES);
}
void
NextPage()
{
Line *newline;
if (Asking)
return;
if (arg_value() < 0) {
negate_arg_value();
PrevPage();
return;
}
if (arg_type() == YES)
UpScroll();
else {
if (in_window(curwind, curwind->w_bufp->b_last) != -1) {
rbell();
return;
}
newline = next_line(curwind->w_top, max(1, SIZE(curwind) - 1));
SetTop(curwind, curwind->w_line = newline);
if (curwind->w_bufp == curbuf)
SetLine(newline);
}
}
#ifdef MSDOS /* kg */
void
PageScrollUp()
{
int i, n;
n = max(1, SIZE(curwind) - 1);
for (i=0; i<n; i++) {
UpScroll();
redisplay();
}
}
void
PageScrollDown()
{
int i, n;
n = max(1, SIZE(curwind) - 1);
for (i=0; i<n; i++) {
DownScroll();
redisplay();
}
}
#endif /* MSDOS */
void
PrevPage()
{
Line *newline;
if (Asking)
return;
if (arg_value() < 0) {
negate_arg_value();
NextPage();
return;
}
if (arg_type() == YES)
DownScroll();
else {
newline = prev_line(curwind->w_top, max(1, SIZE(curwind) - 1));
SetTop(curwind, curwind->w_line = newline);
if (curwind->w_bufp == curbuf)
SetLine(newline);
}
}
void
UpScroll()
{
SetTop(curwind, next_line(curwind->w_top, arg_value()));
if ((curwind->w_bufp == curbuf) &&
(in_window(curwind, curline) == -1))
SetLine(curwind->w_top);
}
void
DownScroll()
{
SetTop(curwind, prev_line(curwind->w_top, arg_value()));
if ((curwind->w_bufp == curbuf) &&
(in_window(curwind, curline) == -1))
SetLine(curwind->w_top);
}
int VisBell = NO;
void
rbell()
{
RingBell = YES;
}
/* Message prints the null terminated string onto the bottom line of the
terminal. */
void
message(str)
char *str;
{
if (InJoverc)
return;
UpdMesg = YES;
errormsg = NO;
if (str != mesgbuf)
null_ncpy(mesgbuf, str, (sizeof mesgbuf) - 1);
}
/* End of Window */
void
Eow()
{
if (Asking)
return;
SetLine(next_line(curwind->w_top, SIZE(curwind) - 1 -
min(SIZE(curwind) - 1, arg_value() - 1)));
if (!is_an_arg())
Eol();
}
/* Beginning of Window */
void
Bow()
{
if (Asking)
return;
SetLine(next_line(curwind->w_top, min(SIZE(curwind) - 1, arg_value() - 1)));
}
private int LineNo,
last_col,
DoAutoNL;
private Window *old_wind; /* save the window we were in BEFORE
before we were called, if UseBuffers
is nonzero */
int UseBuffers = FALSE;
int TOabort = 0;
/* This initializes the typeout. If send-typeout-to-buffers is set
the buffer NAME is created (emptied if it already exists) and output
goes to the buffer. Otherwise output is drawn on the screen and
erased by TOstop() */
void
TOstart(name, auto_newline)
char *name;
int auto_newline;
{
if (UseBuffers) {
old_wind = curwind;
pop_wind(name, YES, B_SCRATCH);
} else
DisabledRedisplay = YES;
TOabort = LineNo = last_col = 0;
DoAutoNL = auto_newline;
}
#ifdef STDARGS
void
Typeout(char *fmt, ...)
#else
/*VARARGS1*/ void
Typeout(fmt, va_alist)
char *fmt;
va_dcl
#endif
{
if (TOabort)
return;
if (!UseBuffers && (LineNo == ILI - 1)) {
register int c;
LineNo = 0;
last_col = 0;
f_mess("--more--");
if ((c = jgetchar()) != ' ') {
TOabort = YES;
if (c != AbortChar && c != RUBOUT)
Ungetc(c);
f_mess(NullStr);
return;
}
f_mess(NullStr);
}
if (fmt) {
char string[132];
va_list ap;
va_init(ap, fmt);
format(string, sizeof string, fmt, ap);
va_end(ap);
if (UseBuffers)
ins_str(string, NO);
else {
i_set(LineNo, last_col);
(void) swrite(string, NO, YES);
last_col = i_col;
}
}
if (!UseBuffers) {
PhysScreen[LineNo].s_id = -1;
if (fmt == 0 || DoAutoNL == YES) {
cl_eol();
flusho();
LineNo += 1;
last_col = 0;
}
} else if (fmt == 0 || DoAutoNL != 0)
ins_str("\n", NO);
}
void
TOstop()
{
int c;
if (UseBuffers) {
ToFirst();
SetWind(old_wind);
} else {
if (TOabort) {
DisabledRedisplay = NO;
return;
}
if (last_col != 0)
Typeout((char *) 0);
Typeout("----------");
cl_eol();
flusho();
c = jgetchar();
if (c != ' ')
Ungetc(c);
DisabledRedisplay = NO;
}
}