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diff -u -r ../mdocml-1.14.1/term_ascii.c ./term_ascii.c
--- ../mdocml-1.14.1/term_ascii.c 2017-02-21 00:25:20.000000000 +0000
+++ ./term_ascii.c 2017-03-02 14:04:37.164590198 +0000
@@ -18,8 +18,10 @@
#include "config.h"
#include <sys/types.h>
+#include <sys/ioctl.h>
#include <assert.h>
+#include <fcntl.h>
#if HAVE_WCHAR
#include <locale.h>
#endif
@@ -64,12 +66,22 @@
char *v;
#endif
struct termp *p;
+ struct winsize ws;
+ int tfd;
p = mandoc_calloc(1, sizeof(struct termp));
p->line = 1;
p->tabwidth = 5;
p->defrmargin = p->lastrmargin = 78;
+ if ((tfd = open("/dev/tty", O_RDWR, 0)) != -1) {
+ if (ioctl(tfd, TIOCGWINSZ, &ws) != -1) {
+ if (ws.ws_col < 80)
+ p->defrmargin = p->lastrmargin = ws.ws_col - 2;
+ }
+ close(tfd);
+ }
+
p->fontq = mandoc_reallocarray(NULL,
(p->fontsz = 8), sizeof(enum termfont));
p->fontq[0] = p->fontl = TERMFONT_NONE;