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Fix deadlock between warning display and refresh engines. This fix

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is taken from nvi-1.51.5.

PR:		bin/3170
Reported by:	fenner
Obtained from:	skimo@kotnet.org

MFC after:	1 month
This commit is contained in:
Sheldon Hearn 2002-01-31 14:20:50 +00:00
parent b4f6fcd394
commit 17c17f89c5
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/vendor/nvi/dist/; revision=90025
1 changed files with 9 additions and 8 deletions
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17
contrib/nvi/vi/vs_line.c
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@ -49,7 +49,7 @@ vs_line(sp, smp, yp, xp)
size_t chlen, cno_cnt, cols_per_screen, len, nlen;
size_t offset_in_char, offset_in_line, oldx, oldy;
size_t scno, skip_cols, skip_screens;
int ch, dne, is_cached, is_partial, is_tab;
int ch, dne, is_cached, is_partial, is_tab, no_draw;
int list_tab, list_dollar;
char *p, *cbp, *ecbp, cbuf[128];
@ -61,10 +61,11 @@ vs_line(sp, smp, yp, xp)
* If ex modifies the screen after ex output is already on the screen,
* don't touch it -- we'll get scrolling wrong, at best.
*/
no_draw = 0;
if (!F_ISSET(sp, SC_TINPUT_INFO) && VIP(sp)->totalcount > 1)
return (0);
no_draw = 1;
if (F_ISSET(sp, SC_SCR_EXWROTE) && smp - HMAP != LASTLINE(sp))
return (0);
no_draw = 1;
/*
* Assume that, if the cache entry for the line is filled in, the
@ -73,7 +74,7 @@ vs_line(sp, smp, yp, xp)
* cursor position, we can just return.
*/
is_cached = SMAP_CACHE(smp);
if (yp == NULL && is_cached)
if (yp == NULL && (is_cached || no_draw))
return (0);
/*
@ -158,7 +159,7 @@ vs_line(sp, smp, yp, xp)
}
/* If the line is on the screen, quit. */
if (is_cached)
if (is_cached || no_draw)
goto ret1;
/* Set line cache information. */
@ -325,7 +326,7 @@ empty: (void)gp->scr_addstr(sp,
offset_in_line + cols_per_screen < sp->cno) {
cno_cnt = 0;
/* If the line is on the screen, quit. */
if (is_cached)
if (is_cached || no_draw)
goto ret1;
} else
cno_cnt = (sp->cno - offset_in_line) + 1;
@ -389,12 +390,12 @@ empty: (void)gp->scr_addstr(sp,
*xp += O_NUMBER_LENGTH;
/* If the line is on the screen, quit. */
if (is_cached)
if (is_cached || no_draw)
goto ret1;
}
/* If the line is on the screen, don't display anything. */
if (is_cached)
if (is_cached || no_draw)
continue;
#define FLUSH { \