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ed.refresh.c
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/*
* ed.refresh.c: Lower level screen refreshing functions
*/
/*-
* Copyright (c) 1980, 1991 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "sh.h"
#include "ed.h"
/* #define DEBUG_UPDATE */
/* #define DEBUG_REFRESH */
/* #define DEBUG_LITERAL */
/* refresh.c -- refresh the current set of lines on the screen */
Char *litptr;
static int vcursor_h, vcursor_v;
static int rprompt_h, rprompt_v;
static int MakeLiteral (Char *, int, Char);
static int Draw (Char *, int, int);
static void Vdraw (Char, int);
static void RefreshPromptpart (Char *);
static void update_line (Char *, Char *, int);
static void str_insert (Char *, int, int, Char *, int);
static void str_delete (Char *, int, int, int);
static void str_cp (Char *, Char *, int);
#ifndef WINNT_NATIVE
static
#else
extern
#endif
void PutPlusOne (Char, int);
static void cpy_pad_spaces (Char *, Char *, int);
#if defined(DEBUG_UPDATE) || defined(DEBUG_REFRESH) || defined(DEBUG_LITERAL)
static void reprintf (char *, ...);
#ifdef DEBUG_UPDATE
static void dprintstr (char *, const Char *, const Char *);
static void
dprintstr(char *str, const Char *f, const Char *t)
{
reprintf("%s:\"", str);
while (f < t) {
if (ASC(*f) & ~ASCII)
reprintf("[%x]", *f++);
else
reprintf("%c", CTL_ESC(ASCII & ASC(*f++)));
}
reprintf("\"\r\n");
}
#endif /* DEBUG_UPDATE */
/* reprintf():
* Print to $DEBUGTTY, so that we can test editing on one pty, and
* print debugging stuff on another. Don't interrupt the shell while
* debugging cause you'll mangle up the file descriptors!
*/
static void
reprintf(char *fmt, ...)
{
static int fd = -1;
char *dtty;
if ((dtty = getenv("DEBUGTTY"))) {
int o;
va_list va;
va_start(va, fmt);
if (fd == -1)
fd = xopen(dtty, O_RDWR);
o = SHOUT;
flush();
SHOUT = fd;
xvprintf(fmt, va);
va_end(va);
flush();
SHOUT = o;
}
}
#endif /* DEBUG_UPDATE || DEBUG_REFRESH || DEBUG_LITERAL */
static int litlen = 0, litalloc = 0;
static int MakeLiteral(Char *str, int len, Char addlit)
{
int i, addlitlen = 0;
Char *addlitptr = 0;
if (addlit) {
if ((addlit & LITERAL) != 0) {
addlitptr = litptr + (addlit & ~LITERAL) * LIT_FACTOR;
addlitlen = Strlen(addlitptr);
} else {
addlitptr = &addlit;
addlitlen = 1;
}
for (i = 0; i < litlen; i += LIT_FACTOR)
if (!Strncmp(addlitptr, litptr + i, addlitlen) && !Strncmp(str, litptr + i + addlitlen, len) && litptr[i + addlitlen + len] == 0)
return (i / LIT_FACTOR) | LITERAL;
} else {
addlitlen = 0;
for (i = 0; i < litlen; i += LIT_FACTOR)
if (!Strncmp(str, litptr + i, len) && litptr[i + len] == 0)
return (i / LIT_FACTOR) | LITERAL;
}
if (litlen + addlitlen + len + 1 + (LIT_FACTOR - 1) > litalloc) {
Char *newlitptr;
int add = 256;
while (len + addlitlen + 1 + (LIT_FACTOR - 1) > add)
add *= 2;
newlitptr = xrealloc(litptr, (litalloc + add) * sizeof(Char));
if (!newlitptr)
return '?';
litptr = newlitptr;
litalloc += add;
if (addlitptr && addlitptr != &addlit)
addlitptr = litptr + (addlit & ~LITERAL) * LIT_FACTOR;
}
i = litlen / LIT_FACTOR;
if (i >= LITERAL || i == CHAR_DBWIDTH)
return '?';
if (addlitptr) {
Strncpy(litptr + litlen, addlitptr, addlitlen);
litlen += addlitlen;
}
Strncpy(litptr + litlen, str, len);
litlen += len;
do
litptr[litlen++] = 0;
while (litlen % LIT_FACTOR);
return i | LITERAL;
}
/* draw char at cp, expand tabs, ctl chars */
static int
Draw(Char *cp, int nocomb, int drawPrompt)
{
int w, i, lv, lh;
Char c, attr;
#ifdef WIDE_STRINGS
if (!drawPrompt) { /* draw command-line */
attr = 0;
c = *cp;
} else { /* draw prompt */
/* prompt with attributes(UNDER,BOLD,STANDOUT) */
if (*cp & (UNDER | BOLD | STANDOUT)) { /* *cp >= STANDOUT */
/* example)
* We can't distinguish whether (*cp=)0x02ffffff is
* U+02FFFFFF or U+00FFFFFF|STANDOUT.
* We handle as U+00FFFFFF|STANDOUT, only when drawing prompt. */
attr = (*cp & ATTRIBUTES);
/* ~(UNDER | BOLD | STANDOUT) = 0xf1ffffff */
c = *cp & ~(UNDER | BOLD | STANDOUT);
/* if c is ctrl code, we handle *cp as havnig no attributes */
if ((c < 0x20 && c >= 0) || c == 0x7f) {
attr = 0;
c = *cp;
}
} else { /* prompt without attributes */
attr = 0;
c = *cp;
}
}
#else
attr = *cp & ~CHAR;
c = *cp & CHAR;
#endif
w = NLSClassify(c, nocomb, drawPrompt);
switch (w) {
case NLSCLASS_NL:
Vdraw('\0', 0); /* assure end of line */
vcursor_h = 0; /* reset cursor pos */
vcursor_v++;
break;
case NLSCLASS_TAB:
do {
Vdraw(' ', 1);
} while ((vcursor_h & 07) != 0);
break;
case NLSCLASS_CTRL:
Vdraw('^' | attr, 1);
if (c == CTL_ESC('\177')) {
Vdraw('?' | attr, 1);
} else {
#ifdef IS_ASCII
/* uncontrolify it; works only for iso8859-1 like sets */
Vdraw(c | 0100 | attr, 1);
#else
Vdraw(_toebcdic[_toascii[c]|0100] | attr, 1);
#endif
}
break;
case NLSCLASS_ILLEGAL:
Vdraw('\\' | attr, 1);
Vdraw((((c >> 6) & 7) + '0') | attr, 1);
Vdraw((((c >> 3) & 7) + '0') | attr, 1);
Vdraw(((c & 7) + '0') | attr, 1);
break;
case NLSCLASS_ILLEGAL2:
case NLSCLASS_ILLEGAL3:
case NLSCLASS_ILLEGAL4:
case NLSCLASS_ILLEGAL5:
Vdraw('\\', 1);
Vdraw('U', 1);
Vdraw('+', 1);
for (i = 16 + 4 * (-w-5); i >= 0; i -= 4)
Vdraw("0123456789ABCDEF"[(c >> i) & 15] | attr, 1);
break;
case 0:
lv = vcursor_v;
lh = vcursor_h;
for (;;) {
lh--;
if (lh < 0) {
lv--;
if (lv < 0)
break;
lh = Strlen(Vdisplay[lv]) - 1;
}
if (Vdisplay[lv][lh] != CHAR_DBWIDTH)
break;
}
if (lv < 0) {
Vdraw('\\' | attr, 1);
Vdraw((((c >> 6) & 7) + '0') | attr, 1);
Vdraw((((c >> 3) & 7) + '0') | attr, 1);
Vdraw(((c & 7) + '0') | attr, 1);
break;
}
Vdisplay[lv][lh] = MakeLiteral(cp, 1, Vdisplay[lv][lh]);
break;
default:
Vdraw(*cp, w);
break;
}
return 1;
}
static void
Vdraw(Char c, int width) /* draw char c onto V lines */
{
#ifdef DEBUG_REFRESH
# ifdef SHORT_STRINGS
reprintf("Vdrawing %6.6o '%c' %d\r\n", (unsigned)c, (int)(c & ASCII), width);
# else
reprintf("Vdrawing %3.3o '%c' %d\r\n", (unsigned)c, (int)c, width);
# endif /* SHORT_STRNGS */
#endif /* DEBUG_REFRESH */
/* Hopefully this is what all the terminals do with multi-column characters
that "span line breaks". */
while (vcursor_h + width > TermH)
Vdraw(' ', 1);
Vdisplay[vcursor_v][vcursor_h] = c;
if (width)
vcursor_h++; /* advance to next place */
while (--width > 0)
Vdisplay[vcursor_v][vcursor_h++] = CHAR_DBWIDTH;
if (vcursor_h >= TermH) {
Vdisplay[vcursor_v][TermH] = '\0'; /* assure end of line */
vcursor_h = 0; /* reset it. */
vcursor_v++;
#ifdef DEBUG_REFRESH
if (vcursor_v >= TermV) { /* should NEVER happen. */
reprintf("\r\nVdraw: vcursor_v overflow! Vcursor_v == %d > %d\r\n",
vcursor_v, TermV);
abort();
}
#endif /* DEBUG_REFRESH */
}
}
/*
* RefreshPromptpart()
* draws a prompt element, expanding literals (we know it's ASCIZ)
*/
static void
RefreshPromptpart(Char *buf)
{
Char *cp;
int w;
if (buf == NULL)
return;
for (cp = buf; *cp; ) {
if (*cp & LITERAL) {
Char *litstart = cp;
while (*cp & LITERAL)
cp++;
if (*cp) {
w = NLSWidth(*cp & CHAR);
Vdraw(MakeLiteral(litstart, cp + 1 - litstart, 0), w);
cp++;
}
else {
/*
* XXX: This is a bug, we lose the last literal, if it is not
* followed by a normal character, but it is too hard to fix
*/
break;
}
}
else
cp += Draw(cp, cp == buf, 1);
}
}
/*
* Refresh()
* draws the new virtual screen image from the current input
* line, then goes line-by-line changing the real image to the new
* virtual image. The routine to re-draw a line can be replaced
* easily in hopes of a smarter one being placed there.
*/
#ifndef WINNT_NATIVE
static
#endif
int OldvcV = 0;
void
Refresh(void)
{
int cur_line;
Char *cp;
int cur_h, cur_v = 0, new_vcv;
int rhdiff;
Char oldgetting;
#ifdef DEBUG_REFRESH
reprintf("Prompt = :%s:\r\n", short2str(Prompt));
reprintf("InputBuf = :%s:\r\n", short2str(InputBuf));
#endif /* DEBUG_REFRESH */
oldgetting = GettingInput;
GettingInput = 0; /* avoid re-entrance via SIGWINCH */
/* reset the Vdraw cursor, temporarily draw rprompt to calculate its size */
vcursor_h = 0;
vcursor_v = 0;
RefreshPromptpart(RPrompt);
rprompt_h = vcursor_h;
rprompt_v = vcursor_v;
/* reset the Vdraw cursor, draw prompt */
vcursor_h = 0;
vcursor_v = 0;
RefreshPromptpart(Prompt);
cur_h = -1; /* set flag in case I'm not set */
/* draw the current input buffer */
for (cp = InputBuf; (cp < LastChar); ) {
if (cp >= Cursor && cur_h == -1) {
cur_h = vcursor_h; /* save for later */
cur_v = vcursor_v;
Cursor = cp;
}
cp += Draw(cp, cp == InputBuf, 0);
}
if (cur_h == -1) { /* if I haven't been set yet, I'm at the end */
cur_h = vcursor_h;
cur_v = vcursor_v;
}
rhdiff = TermH - vcursor_h - rprompt_h;
if (rprompt_h != 0 && rprompt_v == 0 && vcursor_v == 0 && rhdiff > 1) {
/*
* have a right-hand side prompt that will fit on
* the end of the first line with at least one
* character gap to the input buffer.
*/
while (--rhdiff > 0) /* pad out with spaces */
Vdraw(' ', 1);
RefreshPromptpart(RPrompt);
}
else {
rprompt_h = 0; /* flag "not using rprompt" */
rprompt_v = 0;
}
new_vcv = vcursor_v; /* must be done BEFORE the NUL is written */
Vdraw('\0', 1); /* put NUL on end */
#if defined (DEBUG_REFRESH)
reprintf("TermH=%d, vcur_h=%d, vcur_v=%d, Vdisplay[0]=\r\n:%80.80s:\r\n",
TermH, vcursor_h, vcursor_v, short2str(Vdisplay[0]));
#endif /* DEBUG_REFRESH */
#ifdef DEBUG_UPDATE
reprintf("updating %d lines.\r\n", new_vcv);
#endif /* DEBUG_UPDATE */
for (cur_line = 0; cur_line <= new_vcv; cur_line++) {
/* NOTE THAT update_line MAY CHANGE Display[cur_line] */
update_line(Display[cur_line], Vdisplay[cur_line], cur_line);
#ifdef WINNT_NATIVE
flush();
#endif /* WINNT_NATIVE */
/*
* Copy the new line to be the current one, and pad out with spaces
* to the full width of the terminal so that if we try moving the
* cursor by writing the character that is at the end of the
* screen line, it won't be a NUL or some old leftover stuff.
*/
cpy_pad_spaces(Display[cur_line], Vdisplay[cur_line], TermH);
}
#ifdef DEBUG_REFRESH
reprintf("\r\nvcursor_v = %d, OldvcV = %d, cur_line = %d\r\n",
vcursor_v, OldvcV, cur_line);
#endif /* DEBUG_REFRESH */
if (OldvcV > new_vcv) {
for (; cur_line <= OldvcV; cur_line++) {
update_line(Display[cur_line], STRNULL, cur_line);
*Display[cur_line] = '\0';
}
}
OldvcV = new_vcv; /* set for next time */
#ifdef DEBUG_REFRESH
reprintf("\r\nCursorH = %d, CursorV = %d, cur_h = %d, cur_v = %d\r\n",
CursorH, CursorV, cur_h, cur_v);
#endif /* DEBUG_REFRESH */
#ifdef WINNT_NATIVE
flush();
#endif /* WINNT_NATIVE */
MoveToLine(cur_v); /* go to where the cursor is */
MoveToChar(cur_h);
SetAttributes(0); /* Clear all attributes */
flush(); /* send the output... */
GettingInput = oldgetting; /* reset to old value */
}
#ifdef notdef
GotoBottom(void)
{ /* used to go to last used screen line */
MoveToLine(OldvcV);
}
#endif
void
PastBottom(void)
{ /* used to go to last used screen line */
MoveToLine(OldvcV);
(void) putraw('\r');
(void) putraw('\n');
ClearDisp();
flush();
}
/* insert num characters of s into d (in front of the character) at dat,
maximum length of d is dlen */
static void
str_insert(Char *d, int dat, int dlen, Char *s, int num)
{
Char *a, *b;
if (num <= 0)
return;
if (num > dlen - dat)
num = dlen - dat;
#ifdef DEBUG_REFRESH
reprintf("str_insert() starting: %d at %d max %d, d == \"%s\"\n",
num, dat, dlen, short2str(d));
reprintf("s == \"%s\"n", short2str(s));
#endif /* DEBUG_REFRESH */
/* open up the space for num chars */
if (num > 0) {
b = d + dlen - 1;
a = b - num;
while (a >= &d[dat])
*b-- = *a--;
d[dlen] = '\0'; /* just in case */
}
#ifdef DEBUG_REFRESH
reprintf("str_insert() after insert: %d at %d max %d, d == \"%s\"\n",
num, dat, dlen, short2str(d));
reprintf("s == \"%s\"n", short2str(s));
#endif /* DEBUG_REFRESH */
/* copy the characters */
for (a = d + dat; (a < d + dlen) && (num > 0); num--)
*a++ = *s++;
#ifdef DEBUG_REFRESH
reprintf("str_insert() after copy: %d at %d max %d, d == \"%s\"\n",
num, dat, dlen, d, short2str(s));
reprintf("s == \"%s\"n", short2str(s));
#endif /* DEBUG_REFRESH */
}
/* delete num characters d at dat, maximum length of d is dlen */
static void
str_delete(Char *d, int dat, int dlen, int num)
{
Char *a, *b;
if (num <= 0)
return;
if (dat + num >= dlen) {
d[dat] = '\0';
return;
}
#ifdef DEBUG_REFRESH
reprintf("str_delete() starting: %d at %d max %d, d == \"%s\"\n",
num, dat, dlen, short2str(d));
#endif /* DEBUG_REFRESH */
/* open up the space for num chars */
if (num > 0) {
b = d + dat;
a = b + num;
while (a < &d[dlen])
*b++ = *a++;
d[dlen] = '\0'; /* just in case */
}
#ifdef DEBUG_REFRESH
reprintf("str_delete() after delete: %d at %d max %d, d == \"%s\"\n",
num, dat, dlen, short2str(d));
#endif /* DEBUG_REFRESH */
}
static void
str_cp(Char *a, Char *b, int n)
{
while (n-- && *b)
*a++ = *b++;
}
/* ****************************************************************
update_line() is based on finding the middle difference of each line
on the screen; vis:
/old first difference
/beginning of line | /old last same /old EOL
v v v v
old: eddie> Oh, my little gruntle-buggy is to me, as lurgid as
new: eddie> Oh, my little buggy says to me, as lurgid as
^ ^ ^ ^
\beginning of line | \new last same \new end of line
\new first difference
all are character pointers for the sake of speed. Special cases for
no differences, as well as for end of line additions must be handled.
**************************************************************** */
/* Minimum at which doing an insert it "worth it". This should be about
* half the "cost" of going into insert mode, inserting a character, and
* going back out. This should really be calculated from the termcap
* data... For the moment, a good number for ANSI terminals.
*/
#define MIN_END_KEEP 4
static void /* could be changed to make it smarter */
update_line(Char *old, Char *new, int cur_line)
{
Char *o, *n, *p, c;
Char *ofd, *ols, *oe, *nfd, *nls, *ne;
Char *osb, *ose, *nsb, *nse;
int fx, sx;
/*
* find first diff (won't be CHAR_DBWIDTH in either line)
*/
for (o = old, n = new; *o && (*o == *n); o++, n++)
continue;
ofd = o;
nfd = n;
/*
* Find the end of both old and new
*/
o = Strend(o);
/*
* Remove any trailing blanks off of the end, being careful not to
* back up past the beginning.
*/
if (!(adrof(STRhighlight) && MarkIsSet)) {
while (ofd < o) {
if (o[-1] != ' ')
break;
o--;
}
}
oe = o;
*oe = (Char) 0;
n = Strend(n);
/* remove blanks from end of new */
if (!(adrof(STRhighlight) && MarkIsSet)) {
while (nfd < n) {
if (n[-1] != ' ')
break;
n--;
}
}
ne = n;
*ne = (Char) 0;
/*
* if no diff, continue to next line of redraw
*/
if (*ofd == '\0' && *nfd == '\0') {
#ifdef DEBUG_UPDATE
reprintf("no difference.\r\n");
#endif /* DEBUG_UPDATE */
return;
}
/*
* find last same pointer
*/
while ((o > ofd) && (n > nfd) && (*--o == *--n))
continue;
if (*o != *n) {
o++;
n++;
}
while (*o == CHAR_DBWIDTH) {
o++;
n++;
}
ols = o;
nls = n;
/*
* find same begining and same end
*/
osb = ols;
nsb = nls;
ose = ols;
nse = nls;
/*
* case 1: insert: scan from nfd to nls looking for *ofd
*/
if (*ofd) {
for (c = *ofd, n = nfd; n < nls; n++) {
if (c == *n) {
for (o = ofd, p = n; p < nls && o < ols && *o == *p; o++, p++)
continue;
/*
* if the new match is longer and it's worth keeping, then we
* take it
*/
if (((nse - nsb) < (p - n)) && (2 * (p - n) > n - nfd)) {
nsb = n;
nse = p;
osb = ofd;
ose = o;
}
}
}
}
/*
* case 2: delete: scan from ofd to ols looking for *nfd
*/
if (*nfd) {
for (c = *nfd, o = ofd; o < ols; o++) {
if (c == *o) {
for (n = nfd, p = o; p < ols && n < nls && *p == *n; p++, n++)
continue;
/*
* if the new match is longer and it's worth keeping, then we
* take it
*/
if (((ose - osb) < (p - o)) && (2 * (p - o) > o - ofd)) {
nsb = nfd;
nse = n;
osb = o;
ose = p;
}
}
}
}
#ifdef notdef
/*
* If `last same' is before `same end' re-adjust
*/
if (ols < ose)
ols = ose;
if (nls < nse)
nls = nse;
#endif
/*
* Pragmatics I: If old trailing whitespace or not enough characters to
* save to be worth it, then don't save the last same info.
*/
if ((oe - ols) < MIN_END_KEEP) {
ols = oe;
nls = ne;
}
/*
* Pragmatics II: if the terminal isn't smart enough, make the data dumber
* so the smart update doesn't try anything fancy
*/
/*
* fx is the number of characters we need to insert/delete: in the
* beginning to bring the two same begins together
*/
fx = (int) ((nsb - nfd) - (osb - ofd));
/*
* sx is the number of characters we need to insert/delete: in the end to
* bring the two same last parts together
*/
sx = (int) ((nls - nse) - (ols - ose));
if (!T_CanIns) {
if (fx > 0) {
osb = ols;
ose = ols;
nsb = nls;
nse = nls;
}
if (sx > 0) {
ols = oe;
nls = ne;
}
if ((ols - ofd) < (nls - nfd)) {
ols = oe;
nls = ne;
}
}
if (!T_CanDel) {
if (fx < 0) {
osb = ols;
ose = ols;
nsb = nls;
nse = nls;
}
if (sx < 0) {
ols = oe;
nls = ne;
}
if ((ols - ofd) > (nls - nfd)) {
ols = oe;
nls = ne;
}
}
/*
* Pragmatics III: make sure the middle shifted pointers are correct if
* they don't point to anything (we may have moved ols or nls).
*/
/* if the change isn't worth it, don't bother */
/* was: if (osb == ose) */
if ((ose - osb) < MIN_END_KEEP) {
osb = ols;
ose = ols;
nsb = nls;
nse = nls;
}
/*
* Now that we are done with pragmatics we recompute fx, sx
*/
fx = (int) ((nsb - nfd) - (osb - ofd));
sx = (int) ((nls - nse) - (ols - ose));
#ifdef DEBUG_UPDATE
reprintf("\n");
reprintf("ofd %d, osb %d, ose %d, ols %d, oe %d\n",
ofd - old, osb - old, ose - old, ols - old, oe - old);
reprintf("nfd %d, nsb %d, nse %d, nls %d, ne %d\n",
nfd - new, nsb - new, nse - new, nls - new, ne - new);
reprintf("xxx-xxx:\"00000000001111111111222222222233333333334\"\r\n");
reprintf("xxx-xxx:\"01234567890123456789012345678901234567890\"\r\n");
dprintstr("old- oe", old, oe);
dprintstr("new- ne", new, ne);
dprintstr("old-ofd", old, ofd);
dprintstr("new-nfd", new, nfd);
dprintstr("ofd-osb", ofd, osb);
dprintstr("nfd-nsb", nfd, nsb);
dprintstr("osb-ose", osb, ose);
dprintstr("nsb-nse", nsb, nse);
dprintstr("ose-ols", ose, ols);
dprintstr("nse-nls", nse, nls);
dprintstr("ols- oe", ols, oe);
dprintstr("nls- ne", nls, ne);
#endif /* DEBUG_UPDATE */
/*
* CursorV to this line cur_line MUST be in this routine so that if we
* don't have to change the line, we don't move to it. CursorH to first
* diff char
*/
MoveToLine(cur_line);
/*
* at this point we have something like this:
*
* /old /ofd /osb /ose /ols /oe
* v.....................v v..................v v........v
* eddie> Oh, my fredded gruntle-buggy is to me, as foo var lurgid as
* eddie> Oh, my fredded quiux buggy is to me, as gruntle-lurgid as
* ^.....................^ ^..................^ ^........^
* \new \nfd \nsb \nse \nls \ne
*
* fx is the difference in length between the the chars between nfd and
* nsb, and the chars between ofd and osb, and is thus the number of
* characters to delete if < 0 (new is shorter than old, as above),
* or insert (new is longer than short).
*
* sx is the same for the second differences.
*/
/*
* if we have a net insert on the first difference, AND inserting the net
* amount ((nsb-nfd) - (osb-ofd)) won't push the last useful character
* (which is ne if nls != ne, otherwise is nse) off the edge of the screen
* (TermH - 1) else we do the deletes first so that we keep everything we
* need to.
*/
/*
* if the last same is the same like the end, there is no last same part,
* otherwise we want to keep the last same part set p to the last useful
* old character
*/
p = (ols != oe) ? oe : ose;
/*
* if (There is a diffence in the beginning) && (we need to insert
* characters) && (the number of characters to insert is less than the term
* width) We need to do an insert! else if (we need to delete characters)
* We need to delete characters! else No insert or delete
*/
if ((nsb != nfd) && fx > 0 && ((p - old) + fx < TermH)) {
#ifdef DEBUG_UPDATE
reprintf("first diff insert at %d...\r\n", nfd - new);
#endif /* DEBUG_UPDATE */
/*
* Move to the first char to insert, where the first diff is.
*/
MoveToChar(nfd - new);
/*
* Check if we have stuff to keep at end
*/
if (nsb != ne) {
#ifdef DEBUG_UPDATE
reprintf("with stuff to keep at end\r\n");
#endif /* DEBUG_UPDATE */
/*
* insert fx chars of new starting at nfd
*/
if (fx > 0) {
#ifdef DEBUG_UPDATE
if (!T_CanIns)
reprintf(" ERROR: cannot insert in early first diff\n");
#endif /* DEBUG_UPDATE */
Insert_write(nfd, fx);
str_insert(old, (int) (ofd - old), TermH, nfd, fx);
}
/*
* write (nsb-nfd) - fx chars of new starting at (nfd + fx)
*/
so_write(nfd + fx, (nsb - nfd) - fx);
str_cp(ofd + fx, nfd + fx, (int) ((nsb - nfd) - fx));
}
else {
#ifdef DEBUG_UPDATE
reprintf("without anything to save\r\n");
#endif /* DEBUG_UPDATE */
so_write(nfd, (nsb - nfd));
str_cp(ofd, nfd, (int) (nsb - nfd));
/*
* Done
*/
return;
}
}
else if (fx < 0) {
#ifdef DEBUG_UPDATE
reprintf("first diff delete at %d...\r\n", ofd - old);
#endif /* DEBUG_UPDATE */
/*
* move to the first char to delete where the first diff is
*/
MoveToChar(ofd - old);
/*
* Check if we have stuff to save
*/
if (osb != oe) {
#ifdef DEBUG_UPDATE
reprintf("with stuff to save at end\r\n");
#endif /* DEBUG_UPDATE */
/*
* fx is less than zero *always* here but we check for code
* symmetry
*/
if (fx < 0) {
#ifdef DEBUG_UPDATE
if (!T_CanDel)
reprintf(" ERROR: cannot delete in first diff\n");
#endif /* DEBUG_UPDATE */
DeleteChars(-fx);
str_delete(old, (int) (ofd - old), TermH, -fx);
}
/*
* write (nsb-nfd) chars of new starting at nfd
*/
so_write(nfd, (nsb - nfd));
str_cp(ofd, nfd, (int) (nsb - nfd));
}
else {
#ifdef DEBUG_UPDATE
reprintf("but with nothing left to save\r\n");
#endif /* DEBUG_UPDATE */
/*
* write (nsb-nfd) chars of new starting at nfd
*/
so_write(nfd, (nsb - nfd));
#ifdef DEBUG_REFRESH
reprintf("cleareol %d\n", (oe - old) - (ne - new));
#endif /* DEBUG_UPDATE */
#ifndef WINNT_NATIVE
ClearEOL((oe - old) - (ne - new));
#else
/*
* The calculation above does not work too well on NT
*/
ClearEOL(TermH - CursorH);
#endif /*WINNT_NATIVE*/
/*
* Done
*/
return;
}
}
else
fx = 0;
if (sx < 0) {
#ifdef DEBUG_UPDATE
reprintf("second diff delete at %d...\r\n", (ose - old) + fx);
#endif /* DEBUG_UPDATE */
/*
* Check if we have stuff to delete
*/
/*
* fx is the number of characters inserted (+) or deleted (-)
*/
MoveToChar((ose - old) + fx);
/*
* Check if we have stuff to save
*/
if (ols != oe) {
#ifdef DEBUG_UPDATE
reprintf("with stuff to save at end\r\n");
#endif /* DEBUG_UPDATE */
/*
* Again a duplicate test.
*/
if (sx < 0) {
#ifdef DEBUG_UPDATE
if (!T_CanDel)
reprintf(" ERROR: cannot delete in second diff\n");
#endif /* DEBUG_UPDATE */
DeleteChars(-sx);
}
/*