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