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bin/ksh: fix emacs/vi mode using wrong terminal width
On Sun, 25 Jan 2026 17:23:12 +0100,
Kirill A. Korinsky <kirill@korins.ky> wrote:
>
> On Thu, 22 Jan 2026 16:59:21 +0100,
> Kirill A. Korinsky <kirill@korins.ky> wrote:
> >
> > tech@,
> >
> > this is clear re-submission of my patch to ksh to fix terminal width
> > detecion.
> >
> > xterm and other terminal emulators resize the pty after starting the
> > shell. x_init() queries the terminal size at startup before the resize
> > occurs, so x_cols stays at the default 80 columns.
> >
> > SIGWINCH arrives, but check_sigwinch() isn't called until after command
> > entry. This makes the line editor think the screen is 80 columns, which
> > makes it show '<' and truncate input before the actual terminal edge on
> > large windows, and causes weird behavior on small ones.
> >
> > Call check_sigwinch() when entering edit mode and on EINTR in x_getc().
> > The callback lets emacs/vi mode recalculate display width and redraw.
> >
>
> Here reworked version which addressed an edge case when prompt is duplicated
> when resize had happened when curses application is used which was reported
> by Walter Alejandro Iglesias, and suggestion from chris@ to honor curses
> when it possible.
>
> Also, I had introduced a regression tests with one note: the vi mode resize
> path is multi stage and can interleave with pending input, so the byte
> stream varies even when the final screen is correct; to make the test
> deterministic, edit.c waits for two consecutive quiet poll timeouts to
> ensure the child is idle before sending TIOCSWINSZ and SIGWINCH.
>
Anyone?
diff --git bin/ksh/edit.c bin/ksh/edit.c
index a510b5f9915..09254c1e8c4 100644
--- bin/ksh/edit.c
+++ bin/ksh/edit.c
@@ -26,7 +26,8 @@ X_chars edchars;
static void x_sigwinch(int);
volatile sig_atomic_t got_sigwinch;
-static void check_sigwinch(void);
+void check_sigwinch(void);
+void (*x_resize_cb)(void); /* callback for resize during edit */
static int x_file_glob(int, const char *, int, char ***, int);
static char *x_tilde_expand(const char *);
@@ -64,7 +65,7 @@ x_sigwinch(int sig)
got_sigwinch = 1;
}
-static void
+void
check_sigwinch(void)
{
if (got_sigwinch) {
@@ -81,11 +82,16 @@ check_sigwinch(void)
* see the change cause the environ doesn't change.
*/
if (ws.ws_col) {
+ int old_cols = x_cols;
+
x_cols = ws.ws_col < MIN_COLS ? MIN_COLS :
ws.ws_col;
if ((vp = typeset("COLUMNS", 0, 0, 0, 0)))
setint(vp, (int64_t) ws.ws_col);
+
+ if (x_cols != old_cols && x_resize_cb)
+ (*x_resize_cb)();
}
if (ws.ws_row && (vp = typeset("LINES", 0, 0, 0, 0)))
setint(vp, (int64_t) ws.ws_row);
@@ -126,12 +132,14 @@ x_getc(void)
char c;
int n;
- while ((n = blocking_read(STDIN_FILENO, &c, 1)) < 0 && errno == EINTR)
+ while ((n = blocking_read(STDIN_FILENO, &c, 1)) < 0 && errno == EINTR) {
+ check_sigwinch();
if (trap) {
x_mode(false);
runtraps(0);
x_mode(true);
}
+ }
if (n != 1)
return -1;
return (int) (unsigned char) c;
diff --git bin/ksh/edit.h bin/ksh/edit.h
index e1d200b9c93..e2978f3c7de 100644
--- bin/ksh/edit.h
+++ bin/ksh/edit.h
@@ -39,6 +39,8 @@ extern X_chars edchars;
#define XCF_COMMAND_FILE (XCF_COMMAND|XCF_FILE)
/* edit.c */
+void check_sigwinch(void);
+extern void (*x_resize_cb)(void);
int x_getc(void);
void x_flush(void);
int x_putc(int);
diff --git bin/ksh/emacs.c bin/ksh/emacs.c
index 399ef59ce83..e3664df112f 100644
--- bin/ksh/emacs.c
+++ bin/ksh/emacs.c
@@ -105,6 +105,7 @@ static int xlp_valid;
/* end from 4.9 edit.h } */
static int x_tty; /* are we on a tty? */
static int x_bind_quiet; /* be quiet when binding keys */
+static void x_emacs_resize(void);
static int (*x_last_command)(int);
static char **x_histp; /* history position */
@@ -286,6 +287,9 @@ x_emacs(char *buf, size_t len)
xmp = NULL;
x_histp = histptr + 1;
+ x_resize_cb = NULL;
+ check_sigwinch();
+ x_resize_cb = x_emacs_resize;
xx_cols = x_cols;
x_col = promptlen(prompt, &p);
prompt_skip = p - prompt;
@@ -316,8 +320,11 @@ x_emacs(char *buf, size_t len)
x_last_command = NULL;
while (1) {
x_flush();
- if ((at = x_e_getu8(line, at)) < 0)
+ if ((at = x_e_getu8(line, at)) < 0) {
+ x_resize_cb = NULL;
return 0;
+ }
+
ntries++;
if (x_arg == -1) {
@@ -378,6 +385,7 @@ x_emacs(char *buf, size_t len)
x_last_command = NULL;
break;
case KEOL:
+ x_resize_cb = NULL;
ret = xep - xbuf;
return (ret);
break;
@@ -2166,4 +2174,51 @@ x_lastcp(void)
return (xlp);
}
+static void
+x_emacs_resize(void)
+{
+ int cr_done = 0, cleared = 0;
+
+#ifndef SMALL
+ if (cur_term != NULL) {
+ if (carriage_return != NULL &&
+ tputs(carriage_return, 1, x_putc) != ERR)
+ cr_done = 1;
+ if (clr_eos != NULL &&
+ tputs(clr_eos, 1, x_putc) != ERR)
+ cleared = 1;
+ }
+#endif
+ if (!cr_done)
+ x_putc('\r');
+ if (!cleared) {
+ x_putc('\033');
+ x_putc('[');
+ x_putc('J');
+ }
+
+ xx_cols = x_cols;
+ x_col = promptlen(prompt, NULL);
+ if (x_col > xx_cols)
+ x_col = x_col - (x_col / xx_cols) * xx_cols;
+ x_displen = xx_cols - 2 - x_col;
+ if (x_displen < 1) {
+ x_col = 0;
+ x_displen = xx_cols - 2;
+ prompt_redraw = 0;
+ } else {
+ xbp = xbuf;
+ xlp_valid = false;
+ if (xcp <= x_lastcp()) {
+ x_redraw(0);
+ x_flush();
+ return;
+ }
+ }
+
+ x_col = 0;
+ x_displen = xx_cols - 2;
+ x_adjust();
+}
+
#endif /* EMACS */
diff --git bin/ksh/vi.c bin/ksh/vi.c
index e386fa1e65f..9ac55404ade 100644
--- bin/ksh/vi.c
+++ bin/ksh/vi.c
@@ -75,6 +75,8 @@ static void vi_error(void);
static void vi_macro_reset(void);
static int x_vi_putbuf(const char *, size_t);
static int isu8cont(unsigned char);
+static void x_vi_resize(void);
+static void calc_winsize(void);
#define C_ 0x1 /* a valid command that isn't a M_, E_, U_ */
#define M_ 0x2 /* movement command (h, l, etc.) */
@@ -200,6 +202,9 @@ x_vi(char *buf, size_t len)
{
int c;
+ x_resize_cb = NULL;
+ check_sigwinch();
+ x_resize_cb = x_vi_resize;
vi_reset(buf, len > LINE ? LINE : len);
vi_pprompt(1);
x_flush();
@@ -242,6 +247,7 @@ x_vi(char *buf, size_t len)
x_flush();
}
+ x_resize_cb = NULL;
x_putc('\r'); x_putc('\n'); x_flush();
if (c == -1 || len <= (size_t)es->linelen)
@@ -1425,8 +1431,6 @@ free_edstate(struct edstate *old)
static void
edit_reset(char *buf, size_t len)
{
- const char *p;
-
es = &ebuf;
es->cbuf = buf;
es->cbufsize = len;
@@ -1437,6 +1441,17 @@ edit_reset(char *buf, size_t len)
es->cursor = undo->cursor = 0;
es->winleft = undo->winleft = 0;
+ calc_winsize();
+ win = 0;
+ morec = ' ';
+ holdlen = 0;
+}
+
+static void
+calc_winsize(void)
+{
+ const char *p;
+
cur_col = pwidth = promptlen(prompt, &p);
prompt_skip = p - prompt;
if (pwidth > x_cols - 3 - MIN_EDIT_SPACE) {
@@ -1453,9 +1468,6 @@ edit_reset(char *buf, size_t len)
(void) memset(wbuf[0], ' ', wbuf_len);
(void) memset(wbuf[1], ' ', wbuf_len);
winwidth = x_cols - pwidth - 3;
- win = 0;
- morec = ' ';
- holdlen = 0;
}
/*
@@ -2305,4 +2317,42 @@ isu8cont(unsigned char c)
{
return !Flag(FVISHOW8) && (c & (0x80 | 0x40)) == 0x80;
}
+
+static void
+x_vi_resize(void)
+{
+ int cur = 0, col = 0;
+ int cr_done = 0, cleared = 0;
+
+#ifndef SMALL
+ if (cur_term != NULL) {
+ if (carriage_return != NULL &&
+ tputs(carriage_return, 1, x_putc) != ERR)
+ cr_done = 1;
+ if (clr_eos != NULL &&
+ tputs(clr_eos, 1, x_putc) != ERR)
+ cleared = 1;
+ }
+#endif
+ if (!cr_done)
+ x_putc('\r');
+ if (!cleared) {
+ x_putc('\033');
+ x_putc('[');
+ x_putc('J');
+ }
+
+ calc_winsize();
+
+ while (cur < es->linelen)
+ col = newcol((unsigned char) es->cbuf[cur++], col);
+ if (col <= winwidth)
+ es->winleft = 0;
+ else if (outofwin())
+ rewindow();
+
+ redraw_line(0, 0);
+ refresh_line(insert != 0);
+ x_flush();
+}
#endif /* VI */
diff --git regress/bin/ksh/edit/edit.c regress/bin/ksh/edit/edit.c
index 7b49f371ab6..785dc5a251b 100644
--- regress/bin/ksh/edit/edit.c
+++ regress/bin/ksh/edit/edit.c
@@ -16,6 +16,7 @@
*/
#include <sys/wait.h>
+#include <sys/ioctl.h>
#include <err.h>
#include <errno.h>
@@ -49,6 +50,7 @@ main(int argc, char *argv[])
ssize_t n;
size_t nin, nprompt, nread, nwrite;
int c, nready, ptyfd, readprompt, ret, status, timeout;
+ int pending_resize, pending_cols, pending_quiet, pending_post;
while ((c = getopt(argc, argv, "p:")) != -1) {
switch (c) {
@@ -96,14 +98,20 @@ main(int argc, char *argv[])
}
nprompt = nread = nwrite = ret = 0;
+ pending_resize = pending_cols = pending_quiet = pending_post = 0;
readprompt = 1;
while (!gotsig) {
pfd.fd = ptyfd;
- if (!readprompt && nwrite < nin)
+ if (pending_resize || pending_post) {
+ pfd.events = POLLIN;
+ timeout = WRTIM;
+ } else if (!readprompt && nwrite < nin) {
pfd.events = POLLOUT;
- else
+ timeout = WRTIM;
+ } else {
pfd.events = POLLIN;
- timeout = readprompt ? PRTIM : WRTIM;
+ timeout = readprompt ? PRTIM : WRTIM;
+ }
nready = poll(&pfd, 1, timeout);
if (nready == -1) {
if (errno == EINTR)
@@ -111,6 +119,22 @@ main(int argc, char *argv[])
err(1, "poll");
}
if (nready == 0) {
+ if (pending_resize) {
+ if (++pending_quiet >= 2) {
+ ws.ws_col = pending_cols;
+ if (ioctl(ptyfd, TIOCSWINSZ, &ws) == -1)
+ err(1, "ioctl TIOCSWINSZ");
+ kill(pid, SIGWINCH);
+ pending_resize = pending_cols = 0;
+ pending_quiet = 0;
+ pending_post = 1;
+ }
+ continue;
+ }
+ if (pending_post) {
+ pending_post = 0;
+ continue;
+ }
if (timeout == PRTIM) {
warnx("timeout waiting from prompt");
ret = 1;
@@ -136,6 +160,28 @@ main(int argc, char *argv[])
readprompt = 0;
}
} else if (pfd.revents & POLLOUT) {
+ if (in[nwrite] == '\0' && nwrite + 3 < nin &&
+ in[nwrite + 1] == 'R' &&
+ in[nwrite + 2] == 'S' &&
+ in[nwrite + 3] >= '0' && in[nwrite + 3] <= '9') {
+ size_t i = nwrite + 3;
+ int cols = 0, nd = 0;
+
+ while (i < nin && nd < 3 &&
+ in[i] >= '0' && in[i] <= '9') {
+ cols = cols * 10 + (in[i] - '0');
+ i++;
+ nd++;
+ }
+ if (nd > 0 && (i == nin ||
+ in[i] < '0' || in[i] > '9') &&
+ cols > 0) {
+ pending_resize = 1;
+ pending_cols = cols;
+ nwrite = i;
+ continue;
+ }
+ }
if (strchr(linefeed, in[nwrite]) != NULL)
readprompt = 1;
@@ -143,6 +189,8 @@ main(int argc, char *argv[])
if (n == -1)
err(1, "write");
nwrite += n;
+ if (pending_resize)
+ pending_quiet = 0;
}
}
close(ptyfd);
diff --git regress/bin/ksh/edit/emacs.sh regress/bin/ksh/edit/emacs.sh
index abd664664bb..6ae4184e928 100644
--- regress/bin/ksh/edit/emacs.sh
+++ regress/bin/ksh/edit/emacs.sh
@@ -52,6 +52,30 @@ testseq "z\0002\0363\0277\0277\0277" " # z\b\0363\0277\0277\0277z\b"
testseq "z\0002\0364\0200\0200\0200" " # z\b\0364\0200\0200\0200z\b"
testseq "z\0002\0364\0217\0277\0277" " # z\b\0364\0217\0277\0277z\b"
+# ASCII resize: cols=1/11/12
+testseq "aaaaaaaaaabbbbbbbbbb\0001\000RS1" \
+ " # aaaaaaaaaabbbbbbbbbb\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\r\033[J\r # aaaaaaa>\b\b\b\b\b\b\b\b"
+testseq "aaaaaaaaaabbbbbbbbbb\003310\0002\000RS11" \
+ " # aaaaaaaaaabbbbbbbbbb\b\b\b\b\b\b\b\b\b\b\r\033[J\raaaaabbbbb*\b\b\b\b\b\b"
+testseq "aaaaaaaaaabbbbbbbbbb\000RS12" \
+ " # aaaaaaaaaabbbbbbbbbb\r\033[J\rbbbbb <\b\b\b\b\b\b"
+
+# ASCII resize: cols=13, cursor -1/0/+1
+testseq "aaaaaaaaaabbbbbbbbbb\003313\0002\000RS13" \
+ " # aaaaaaaaaabbbbbbbbbb\b\b\b\b\b\b\b\b\b\b\b\b\b\r\033[J\r # aaaaaaaa>\b\b"
+testseq "aaaaaaaaaabbbbbbbbbb\003312\0002\000RS13" \
+ " # aaaaaaaaaabbbbbbbbbb\b\b\b\b\b\b\b\b\b\b\b\b\r\033[J\r # aaaaaaaa>\b"
+testseq "aaaaaaaaaabbbbbbbbbb\003311\0002\000RS13" \
+ " # aaaaaaaaaabbbbbbbbbb\b\b\b\b\b\b\b\b\b\b\b\r\033[J\raaaaaabbbbb*\b\b\b\b\b\b\b"
+
+# ASCII resize: cols=79/80/81
+testseq "aaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbccccccccccccccccccccccccc\0001\000RS79" \
+ " # aaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbccccccccccccccccccccccccc\rbbbbbbbbbbbbccccccccccccccccccccccccc <\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\r # aaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbccccccccccccccccccccccccc \b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\r\033[J\r # aaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbcccccccccccccccccccccccc>\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b"
+testseq "aaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbccccccccccccccccccccccccc\0001\000RS80" \
+ " # aaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbccccccccccccccccccccccccc\rbbbbbbbbbbbbccccccccccccccccccccccccc <\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\r # aaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbccccccccccccccccccccccccc \b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b"
+testseq "aaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbccccccccccccccccccccccccc\0001\000RS81" \
+ " # aaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbccccccccccccccccccccccccc\rbbbbbbbbbbbbccccccccccccccccccccccccc <\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\r # aaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbccccccccccccccccccccccccc \b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\r\033[J\r # aaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbccccccccccccccccccccccccc \b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b"
+
# insertion of incomplete UTF-8
testseq "z\0002\0302\0006" " # z\b\0302z\bz"
testseq "z\0002\0377\0006" " # z\b\0377z\bz"
diff --git regress/bin/ksh/edit/vi.sh regress/bin/ksh/edit/vi.sh
index d9ae7967908..eef5886f999 100644
--- regress/bin/ksh/edit/vi.sh
+++ regress/bin/ksh/edit/vi.sh
@@ -233,3 +233,27 @@ testseq "(x)\00330%hrc" " # (x)\b\b\b(x\bc\b"
# ^R: Redraw.
testseq "test\0033h\0022" " # test\b\b\r\r\n # test\b\b"
+
+# ASCII resize: cols=1/11/12
+testseq "aaaaaaaaaabbbbbbbbbb\0033hhhhhhhhhhhhhhhhhhh\000RS1" \
+ " # aaaaaaaaaabbbbbbbbbb\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\r\033[J# aaaaaaa >\r# "
+testseq "aaaaaaaaaabbbbbbbbbb\0033hhhhhhhhh\000RS11" \
+ " # aaaaaaaaaabbbbbbbbbb\b\b\b\b\b\b\b\b\b\b\r\033[J# aaabbbb +\b\b\b\b\b\b"
+testseq "aaaaaaaaaabbbbbbbbbb\0033\000RS12" \
+ " # aaaaaaaaaabbbbbbbbbb\b\r\033[J# bbbb <\b\b\b\b\b\b"
+
+# ASCII resize: cols=13, cursor -1/0/+1
+testseq "aaaaaaaaaabbbbbbbbbb\0033hhhhhhhhhhhhh\000RS13" \
+ " # aaaaaaaaaabbbbbbbbbb\b\b\b\b\b\b\b\b\b\b\b\b\b\b\r\033[J # aaaaaaa >\b\b\b"
+testseq "aaaaaaaaaabbbbbbbbbb\0033hhhhhhhhhhhh\000RS13" \
+ " # aaaaaaaaaabbbbbbbbbb\b\b\b\b\b\b\b\b\b\b\b\b\b\r\033[J # aaaaaab +\b\b\b\b\b\b"
+testseq "aaaaaaaaaabbbbbbbbbb\0033hhhhhhhhhhh\000RS13" \
+ " # aaaaaaaaaabbbbbbbbbb\b\b\b\b\b\b\b\b\b\b\b\b\r\033[J # aaaaabb +\b\b\b\b\b\b"
+
+# ASCII resize: cols=79/80/81
+testseq "aaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbccccccccccccccccccccccccc\0033hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh\000RS79" \
+ " # aaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbccccccccccccccccccccccc\r # bbbbbbbbbbbbbcccccccccccccccccccccccc <\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\bc\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\baaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbcccccccccccccccccccccccc >\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\r\033[J # aaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbccccccccccccccccccccccc >\r # "
+testseq "aaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbccccccccccccccccccccccccc\0033hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh\000RS80" \
+ " # aaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbccccccccccccccccccccccc\r # bbbbbbbbbbbbbcccccccccccccccccccccccc <\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\bc\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\baaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbcccccccccccccccccccccccc >\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b"
+testseq "aaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbccccccccccccccccccccccccc\0033hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh\000RS81" \
+ " # aaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbccccccccccccccccccccccc\r # bbbbbbbbbbbbbcccccccccccccccccccccccc <\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\bc\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\baaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbcccccccccccccccccccccccc >\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\r\033[J # aaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbccccccccccccccccccccccccc >\r # "
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wbr, Kirill
bin/ksh: fix emacs/vi mode using wrong terminal width