Flatten all tags of the dist tree of less.

1 files changed, 0 insertions, 1245 deletions

diff --git a/contrib/less/line.c b/contrib/less/line.c
deleted file mode 100644
index 08ca3be..0000000
--- a/contrib/less/line.c
+++ /dev/null
@@ -1,1245 +0,0 @@
-/*
- * Copyright (C) 1984-2007  Mark Nudelman
- *
- * You may distribute under the terms of either the GNU General Public
- * License or the Less License, as specified in the README file.
- *
- * For more information about less, or for information on how to 
- * contact the author, see the README file.
- */
-
-
-/*
- * Routines to manipulate the "line buffer".
- * The line buffer holds a line of output as it is being built
- * in preparation for output to the screen.
- */
-
-#include "less.h"
-#include "charset.h"
-
-static char *linebuf = NULL;	/* Buffer which holds the current output line */
-static char *attr = NULL;	/* Extension of linebuf to hold attributes */
-public int size_linebuf = 0;	/* Size of line buffer (and attr buffer) */
-
-static int cshift;		/* Current left-shift of output line buffer */
-public int hshift;		/* Desired left-shift of output line buffer */
-public int tabstops[TABSTOP_MAX] = { 0 }; /* Custom tabstops */
-public int ntabstops = 1;	/* Number of tabstops */
-public int tabdefault = 8;	/* Default repeated tabstops */
-
-static int curr;		/* Index into linebuf */
-static int column;		/* Printable length, accounting for
-				   backspaces, etc. */
-static int overstrike;		/* Next char should overstrike previous char */
-static int last_overstrike = AT_NORMAL;
-static int is_null_line;	/* There is no current line */
-static int lmargin;		/* Left margin */
-static int line_matches;	/* Number of search matches in this line */
-static char pendc;
-static POSITION pendpos;
-static char *end_ansi_chars;
-static char *mid_ansi_chars;
-
-static int attr_swidth();
-static int attr_ewidth();
-static int do_append();
-
-extern int sigs;
-extern int bs_mode;
-extern int linenums;
-extern int ctldisp;
-extern int twiddle;
-extern int binattr;
-extern int status_col;
-extern int auto_wrap, ignaw;
-extern int bo_s_width, bo_e_width;
-extern int ul_s_width, ul_e_width;
-extern int bl_s_width, bl_e_width;
-extern int so_s_width, so_e_width;
-extern int sc_width, sc_height;
-extern int utf_mode;
-extern int oldbot;
-extern POSITION start_attnpos;
-extern POSITION end_attnpos;
-
-static char mbc_buf[MAX_UTF_CHAR_LEN];
-static int mbc_buf_len = 0;
-static int mbc_buf_index = 0;
-static POSITION mbc_pos;
-
-/*
- * Initialize from environment variables.
- */
-	public void
-init_line()
-{
-	end_ansi_chars = lgetenv("LESSANSIENDCHARS");
-	if (end_ansi_chars == NULL || *end_ansi_chars == '\0')
-		end_ansi_chars = "m";
-
-	mid_ansi_chars = lgetenv("LESSANSIMIDCHARS");
-	if (mid_ansi_chars == NULL || *mid_ansi_chars == '\0')
-		mid_ansi_chars = "0123456789;[?!\"'#%()*+ ";
-
-	linebuf = (char *) ecalloc(LINEBUF_SIZE, sizeof(char));
-	attr = (char *) ecalloc(LINEBUF_SIZE, sizeof(char));
-	size_linebuf = LINEBUF_SIZE;
-}
-
-/*
- * Expand the line buffer.
- */
-	static int
-expand_linebuf()
-{
-	/* Double the size of the line buffer. */
-	int new_size = size_linebuf * 2;
-
-	/* Just realloc to expand the buffer, if we can. */
-#if HAVE_REALLOC
-	char *new_buf = (char *) realloc(linebuf, new_size);
-	char *new_attr = (char *) realloc(attr, new_size);
-#else
-	char *new_buf = (char *) calloc(new_size, sizeof(char));
-	char *new_attr = (char *) calloc(new_size, sizeof(char));
-#endif
-	if (new_buf == NULL || new_attr == NULL)
-	{
-		if (new_attr != NULL)
-			free(new_attr);
-		if (new_buf != NULL)
-			free(new_buf);
-		return 1;
-	}
-#if HAVE_REALLOC
-	/*
-	 * We realloc'd the buffers; they already have the old contents.
-	 */
-	#if 0
-	memset(new_buf + size_linebuf, 0, new_size - size_linebuf);
-	memset(new_attr + size_linebuf, 0, new_size - size_linebuf);
-	#endif
-#else
-	/*
-	 * We just calloc'd the buffers; copy the old contents.
-	 */
-	memcpy(new_buf, linebuf, size_linebuf * sizeof(char));
-	memcpy(new_attr, attr, size_linebuf * sizeof(char));
-	free(attr);
-	free(linebuf);
-#endif
-	linebuf = new_buf;
-	attr = new_attr;
-	size_linebuf = new_size;
-	return 0;
-}
-
-/*
- * Is a character ASCII?
- */
-	public int
-is_ascii_char(ch)
-	LWCHAR ch;
-{
-	return (ch <= 0x7F);
-}
-
-/*
- * Rewind the line buffer.
- */
-	public void
-prewind()
-{
-	curr = 0;
-	column = 0;
-	cshift = 0;
-	overstrike = 0;
-	last_overstrike = AT_NORMAL;
-	mbc_buf_len = 0;
-	is_null_line = 0;
-	pendc = '\0';
-	lmargin = 0;
-	if (status_col)
-		lmargin += 1;
-#if HILITE_SEARCH
-	line_matches = 0;
-#endif
-}
-
-/*
- * Insert the line number (of the given position) into the line buffer.
- */
-	public void
-plinenum(pos)
-	POSITION pos;
-{
-	register LINENUM linenum = 0;
-	register int i;
-
-	if (linenums == OPT_ONPLUS)
-	{
-		/*
-		 * Get the line number and put it in the current line.
-		 * {{ Note: since find_linenum calls forw_raw_line,
-		 *    it may seek in the input file, requiring the caller 
-		 *    of plinenum to re-seek if necessary. }}
-		 * {{ Since forw_raw_line modifies linebuf, we must
-		 *    do this first, before storing anything in linebuf. }}
-		 */
-		linenum = find_linenum(pos);
-	}
-
-	/*
-	 * Display a status column if the -J option is set.
-	 */
-	if (status_col)
-	{
-		linebuf[curr] = ' ';
-		if (start_attnpos != NULL_POSITION &&
-		    pos >= start_attnpos && pos < end_attnpos)
-			attr[curr] = AT_NORMAL|AT_HILITE;
-		else
-			attr[curr] = AT_NORMAL;
-		curr++;
-		column++;
-	}
-	/*
-	 * Display the line number at the start of each line
-	 * if the -N option is set.
-	 */
-	if (linenums == OPT_ONPLUS)
-	{
-		char buf[INT_STRLEN_BOUND(pos) + 2];
-		int n;
-
-		linenumtoa(linenum, buf);
-		n = strlen(buf);
-		if (n < MIN_LINENUM_WIDTH)
-			n = MIN_LINENUM_WIDTH;
-		sprintf(linebuf+curr, "%*s ", n, buf);
-		n++;  /* One space after the line number. */
-		for (i = 0; i < n; i++)
-			attr[curr+i] = AT_NORMAL;
-		curr += n;
-		column += n;
-		lmargin += n;
-	}
-
-	/*
-	 * Append enough spaces to bring us to the lmargin.
-	 */
-	while (column < lmargin)
-	{
-		linebuf[curr] = ' ';
-		attr[curr++] = AT_NORMAL;
-		column++;
-	}
-}
-
-/*
- * Shift the input line left.
- * This means discarding N printable chars at the start of the buffer.
- */
-	static void
-pshift(shift)
-	int shift;
-{
-	LWCHAR prev_ch = 0;
-	unsigned char c;
-	int shifted = 0;
-	int to;
-	int from;
-	int len;
-	int width;
-	int prev_attr;
-	int next_attr;
-
-	if (shift > column - lmargin)
-		shift = column - lmargin;
-	if (shift > curr - lmargin)
-		shift = curr - lmargin;
-
-	to = from = lmargin;
-	/*
-	 * We keep on going when shifted == shift
-	 * to get all combining chars.
-	 */
-	while (shifted <= shift && from < curr)
-	{
-		c = linebuf[from];
-		if (ctldisp == OPT_ONPLUS && IS_CSI_START(c))
-		{
-			/* Keep cumulative effect.  */
-			linebuf[to] = c;
-			attr[to++] = attr[from++];
-			while (from < curr && linebuf[from])
-			{
-				linebuf[to] = linebuf[from];
-				attr[to++] = attr[from];
-				if (!is_ansi_middle(linebuf[from++]))
-					break;
-			} 
-			continue;
-		}
-
-		width = 0;
-
-		if (!IS_ASCII_OCTET(c) && utf_mode)
-		{
-			/* Assumes well-formedness validation already done.  */
-			LWCHAR ch;
-
-			len = utf_len(c);
-			if (from + len > curr)
-				break;
-			ch = get_wchar(linebuf + from);
-			if (!is_composing_char(ch) && !is_combining_char(prev_ch, ch))
-				width = is_wide_char(ch) ? 2 : 1;
-			prev_ch = ch;
-		} else
-		{
-			len = 1;
-			if (c == '\b')
-				/* XXX - Incorrect if several '\b' in a row.  */
-				width = (utf_mode && is_wide_char(prev_ch)) ? -2 : -1;
-			else if (!control_char(c))
-				width = 1;
-			prev_ch = 0;
-		}
-
-		if (width == 2 && shift - shifted == 1) {
-			/* Should never happen when called by pshift_all().  */
-			attr[to] = attr[from];
-			/*
-			 * Assume a wide_char will never be the first half of a
-			 * combining_char pair, so reset prev_ch in case we're
-			 * followed by a '\b'.
-			 */
-			prev_ch = linebuf[to++] = ' ';
-			from += len;
-			shifted++;
-			continue;
-		}
-
-		/* Adjust width for magic cookies. */
-		prev_attr = (to > 0) ? attr[to-1] : AT_NORMAL;
-		next_attr = (from + len < curr) ? attr[from + len] : prev_attr;
-		if (!is_at_equiv(attr[from], prev_attr) && 
-			!is_at_equiv(attr[from], next_attr))
-		{
-			width += attr_swidth(attr[from]);
-			if (from + len < curr)
-				width += attr_ewidth(attr[from]);
-			if (is_at_equiv(prev_attr, next_attr))
-			{
-				width += attr_ewidth(prev_attr);
-				if (from + len < curr)
-					width += attr_swidth(next_attr);
-			}
-		}
-
-		if (shift - shifted < width)
-			break;
-		from += len;
-		shifted += width;
-		if (shifted < 0)
-			shifted = 0;
-	}
-	while (from < curr)
-	{
-		linebuf[to] = linebuf[from];
-		attr[to++] = attr[from++];
-	}
-	curr = to;
-	column -= shifted;
-	cshift += shifted;
-}
-
-/*
- *
- */
-	public void
-pshift_all()
-{
-	pshift(column);
-}
-
-/*
- * Return the printing width of the start (enter) sequence
- * for a given character attribute.
- */
-	static int
-attr_swidth(a)
-	int a;
-{
-	int w = 0;
-
-	a = apply_at_specials(a);
-
-	if (a & AT_UNDERLINE)
-		w += ul_s_width;
-	if (a & AT_BOLD)
-		w += bo_s_width;
-	if (a & AT_BLINK)
-		w += bl_s_width;
-	if (a & AT_STANDOUT)
-		w += so_s_width;
-
-	return w;
-}
-
-/*
- * Return the printing width of the end (exit) sequence
- * for a given character attribute.
- */
-	static int
-attr_ewidth(a)
-	int a;
-{
-	int w = 0;
-
-	a = apply_at_specials(a);
-
-	if (a & AT_UNDERLINE)
-		w += ul_e_width;
-	if (a & AT_BOLD)
-		w += bo_e_width;
-	if (a & AT_BLINK)
-		w += bl_e_width;
-	if (a & AT_STANDOUT)
-		w += so_e_width;
-
-	return w;
-}
-
-/*
- * Return the printing width of a given character and attribute,
- * if the character were added to the current position in the line buffer.
- * Adding a character with a given attribute may cause an enter or exit
- * attribute sequence to be inserted, so this must be taken into account.
- */
-	static int
-pwidth(ch, a, prev_ch)
-	LWCHAR ch;
-	int a;
-	LWCHAR prev_ch;
-{
-	int w;
-
-	if (ch == '\b')
-		/*
-		 * Backspace moves backwards one or two positions.
-		 * XXX - Incorrect if several '\b' in a row.
-		 */
-		return (utf_mode && is_wide_char(prev_ch)) ? -2 : -1;
-
-	if (!utf_mode || is_ascii_char(ch))
-	{
-		if (control_char((char)ch))
-		{
-			/*
-			 * Control characters do unpredictable things,
-			 * so we don't even try to guess; say it doesn't move.
-			 * This can only happen if the -r flag is in effect.
-			 */
-			return (0);
-		}
-	} else
-	{
-		if (is_composing_char(ch) || is_combining_char(prev_ch, ch))
-		{
-			/*
-			 * Composing and combining chars take up no space.
-			 *
-			 * Some terminals, upon failure to compose a
-			 * composing character with the character(s) that
-			 * precede(s) it will actually take up one column
-			 * for the composing character; there isn't much
-			 * we could do short of testing the (complex)
-			 * composition process ourselves and printing
-			 * a binary representation when it fails.
-			 */
-			return (0);
-		}
-	}
-
-	/*
-	 * Other characters take one or two columns,
-	 * plus the width of any attribute enter/exit sequence.
-	 */
-	w = 1;
-	if (is_wide_char(ch))
-		w++;
-	if (curr > 0 && !is_at_equiv(attr[curr-1], a))
-		w += attr_ewidth(attr[curr-1]);
-	if ((apply_at_specials(a) != AT_NORMAL) &&
-	    (curr == 0 || !is_at_equiv(attr[curr-1], a)))
-		w += attr_swidth(a);
-	return (w);
-}
-
-/*
- * Delete to the previous base character in the line buffer.
- * Return 1 if one is found.
- */
-	static int
-backc()
-{
-	LWCHAR prev_ch;
-	char *p = linebuf + curr;
-	LWCHAR ch = step_char(&p, -1, linebuf + lmargin);
-	int width;
-
-	/* This assumes that there is no '\b' in linebuf.  */
-	while (   curr > lmargin
-	       && column > lmargin
-	       && (!(attr[curr - 1] & (AT_ANSI|AT_BINARY))))
-	{
-		curr = p - linebuf;
-		prev_ch = step_char(&p, -1, linebuf + lmargin);
-		width = pwidth(ch, attr[curr], prev_ch);
-		column -= width;
-		if (width > 0)
-			return 1;
-		ch = prev_ch;
-	}
-
-	return 0;
-}
-
-/*
- * Are we currently within a recognized ANSI escape sequence?
- */
-	static int
-in_ansi_esc_seq()
-{
-	char *p;
-
-	/*
-	 * Search backwards for either an ESC (which means we ARE in a seq);
-	 * or an end char (which means we're NOT in a seq).
-	 */
-	for (p = &linebuf[curr];  p > linebuf; )
-	{
-		LWCHAR ch = step_char(&p, -1, linebuf);
-		if (IS_CSI_START(ch))
-			return (1);
-		if (!is_ansi_middle(ch))
-			return (0);
-	}
-	return (0);
-}
-
-/*
- * Is a character the end of an ANSI escape sequence?
- */
-	public int
-is_ansi_end(ch)
-	LWCHAR ch;
-{
-	if (!is_ascii_char(ch))
-		return (0);
-	return (strchr(end_ansi_chars, (char) ch) != NULL);
-}
-
-/*
- *
- */
-	public int
-is_ansi_middle(ch)
-	LWCHAR ch;
-{
-	if (!is_ascii_char(ch))
-		return (0);
-	if (is_ansi_end(ch))
-		return (0);
-	return (strchr(mid_ansi_chars, (char) ch) != NULL);
-}
-
-/*
- * Append a character and attribute to the line buffer.
- */
-#define	STORE_CHAR(ch,a,rep,pos) \
-	do { \
-		if (store_char((ch),(a),(rep),(pos))) return (1); \
-	} while (0)
-
-	static int
-store_char(ch, a, rep, pos)
-	LWCHAR ch;
-	int a;
-	char *rep;
-	POSITION pos;
-{
-	int w;
-	int replen;
-	char cs;
-
-	w = (a & (AT_UNDERLINE|AT_BOLD));	/* Pre-use w.  */
-	if (w != AT_NORMAL)
-		last_overstrike = w;
-
-#if HILITE_SEARCH
-	{
-		int matches;
-		if (is_hilited(pos, pos+1, 0, &matches))
-		{
-			/*
-			 * This character should be highlighted.
-			 * Override the attribute passed in.
-			 */
-			if (a != AT_ANSI)
-				a |= AT_HILITE;
-		}
-		line_matches += matches;
-	}
-#endif
-
-	if (ctldisp == OPT_ONPLUS && in_ansi_esc_seq())
-	{
-		if (!is_ansi_end(ch) && !is_ansi_middle(ch)) {
-			/* Remove whole unrecognized sequence.  */
-			do {
-				--curr;
-			} while (!IS_CSI_START(linebuf[curr]));
-			return 0;
-		}
-		a = AT_ANSI;	/* Will force re-AT_'ing around it.  */
-		w = 0;
-	}
-	else if (ctldisp == OPT_ONPLUS && IS_CSI_START(ch))
-	{
-		a = AT_ANSI;	/* Will force re-AT_'ing around it.  */
-		w = 0;
-	}
-	else
-	{
-		char *p = &linebuf[curr];
-		LWCHAR prev_ch = step_char(&p, -1, linebuf);
-		w = pwidth(ch, a, prev_ch);
-	}
-
-	if (ctldisp != OPT_ON && column + w + attr_ewidth(a) > sc_width)
-		/*
-		 * Won't fit on screen.
-		 */
-		return (1);
-
-	if (rep == NULL)
-	{
-		cs = (char) ch;
-		rep = &cs;
-		replen = 1;
-	} else
-	{
-		replen = utf_len(rep[0]);
-	}
-	if (curr + replen >= size_linebuf-6)
-	{
-		/*
-		 * Won't fit in line buffer.
-		 * Try to expand it.
-		 */
-		if (expand_linebuf())
-			return (1);
-	}
-
-	while (replen-- > 0)
-	{
-		linebuf[curr] = *rep++;
-		attr[curr] = a;
-		curr++;
-	}
-	column += w;
-	return (0);
-}
-
-/*
- * Append a tab to the line buffer.
- * Store spaces to represent the tab.
- */
-#define	STORE_TAB(a,pos) \
-	do { if (store_tab((a),(pos))) return (1); } while (0)
-
-	static int
-store_tab(attr, pos)
-	int attr;
-	POSITION pos;
-{
-	int to_tab = column + cshift - lmargin;
-	int i;
-
-	if (ntabstops < 2 || to_tab >= tabstops[ntabstops-1])
-		to_tab = tabdefault -
-		     ((to_tab - tabstops[ntabstops-1]) % tabdefault);
-	else
-	{
-		for (i = ntabstops - 2;  i >= 0;  i--)
-			if (to_tab >= tabstops[i])
-				break;
-		to_tab = tabstops[i+1] - to_tab;
-	}
-
-	if (column + to_tab - 1 + pwidth(' ', attr, 0) + attr_ewidth(attr) > sc_width)
-		return 1;
-
-	do {
-		STORE_CHAR(' ', attr, " ", pos);
-	} while (--to_tab > 0);
-	return 0;
-}
-
-#define STORE_PRCHAR(c, pos) \
-	do { if (store_prchar((c), (pos))) return 1; } while (0)
-
-	static int
-store_prchar(c, pos)
-	char c;
-	POSITION pos;
-{
-	char *s;
-
-	/*
-	 * Convert to printable representation.
-	 */
-	s = prchar(c);
-
-	/*
-	 * Make sure we can get the entire representation
-	 * of the character on this line.
-	 */
-	if (column + (int) strlen(s) - 1 +
-            pwidth(' ', binattr, 0) + attr_ewidth(binattr) > sc_width)
-		return 1;
-
-	for ( ;  *s != 0;  s++)
-		STORE_CHAR(*s, AT_BINARY, NULL, pos);
-
-	return 0;
-}
-
-	static int
-flush_mbc_buf(pos)
-	POSITION pos;
-{
-	int i;
-
-	for (i = 0; i < mbc_buf_index; i++)
-		if (store_prchar(mbc_buf[i], pos))
-			return mbc_buf_index - i;
-
-	return 0;
-}
-
-/*
- * Append a character to the line buffer.
- * Expand tabs into spaces, handle underlining, boldfacing, etc.
- * Returns 0 if ok, 1 if couldn't fit in buffer.
- */
-	public int
-pappend(c, pos)
-	char c;
-	POSITION pos;
-{
-	int r;
-
-	if (pendc)
-	{
-		if (do_append(pendc, NULL, pendpos))
-			/*
-			 * Oops.  We've probably lost the char which
-			 * was in pendc, since caller won't back up.
-			 */
-			return (1);
-		pendc = '\0';
-	}
-
-	if (c == '\r' && bs_mode == BS_SPECIAL)
-	{
-		if (mbc_buf_len > 0)  /* utf_mode must be on. */
-		{
-			/* Flush incomplete (truncated) sequence. */
-			r = flush_mbc_buf(mbc_pos);
-			mbc_buf_index = r + 1;
-			mbc_buf_len = 0;
-			if (r)
-				return (mbc_buf_index);
-		}
-
-		/*
-		 * Don't put the CR into the buffer until we see 
-		 * the next char.  If the next char is a newline,
-		 * discard the CR.
-		 */
-		pendc = c;
-		pendpos = pos;
-		return (0);
-	}
-
-	if (!utf_mode)
-	{
-		r = do_append((LWCHAR) c, NULL, pos);
-	} else
-	{
-		/* Perform strict validation in all possible cases. */
-		if (mbc_buf_len == 0)
-		{
-		retry:
-			mbc_buf_index = 1;
-			*mbc_buf = c;
-			if (IS_ASCII_OCTET(c))
-				r = do_append((LWCHAR) c, NULL, pos);
-			else if (IS_UTF8_LEAD(c))
-			{
-				mbc_buf_len = utf_len(c);
-				mbc_pos = pos;
-				return (0);
-			} else
-				/* UTF8_INVALID or stray UTF8_TRAIL */
-				r = flush_mbc_buf(pos);
-		} else if (IS_UTF8_TRAIL(c))
-		{
-			mbc_buf[mbc_buf_index++] = c;
-			if (mbc_buf_index < mbc_buf_len)
-				return (0);
-			if (is_utf8_well_formed(mbc_buf))
-				r = do_append(get_wchar(mbc_buf), mbc_buf, mbc_pos);
-			else
-				/* Complete, but not shortest form, sequence. */
-				mbc_buf_index = r = flush_mbc_buf(mbc_pos);
-			mbc_buf_len = 0;
-		} else
-		{
-			/* Flush incomplete (truncated) sequence.  */
-			r = flush_mbc_buf(mbc_pos);
-			mbc_buf_index = r + 1;
-			mbc_buf_len = 0;
-			/* Handle new char.  */
-			if (!r)
-				goto retry;
- 		}
-	}
-
-	/*
-	 * If we need to shift the line, do it.
-	 * But wait until we get to at least the middle of the screen,
-	 * so shifting it doesn't affect the chars we're currently
-	 * pappending.  (Bold & underline can get messed up otherwise.)
-	 */
-	if (cshift < hshift && column > sc_width / 2)
-	{
-		linebuf[curr] = '\0';
-		pshift(hshift - cshift);
-	}
-	if (r)
-	{
-		/* How many chars should caller back up? */
-		r = (!utf_mode) ? 1 : mbc_buf_index;
-	}
-	return (r);
-}
-
-	static int
-do_append(ch, rep, pos)
-	LWCHAR ch;
-	char *rep;
-	POSITION pos;
-{
-	register int a;
-	LWCHAR prev_ch;
-
-	a = AT_NORMAL;
-
-	if (ch == '\b')
-	{
-		if (bs_mode == BS_CONTROL)
-			goto do_control_char;
-
-		/*
-		 * A better test is needed here so we don't
-		 * backspace over part of the printed
-		 * representation of a binary character.
-		 */
-		if (   curr <= lmargin
-		    || column <= lmargin
-		    || (attr[curr - 1] & (AT_ANSI|AT_BINARY)))
-			STORE_PRCHAR('\b', pos);
-		else if (bs_mode == BS_NORMAL)
-			STORE_CHAR(ch, AT_NORMAL, NULL, pos);
-		else if (bs_mode == BS_SPECIAL)
-			overstrike = backc();
-
-		return 0;
-	}
-
-	if (overstrike > 0)
-	{
-		/*
-		 * Overstrike the character at the current position
-		 * in the line buffer.  This will cause either 
-		 * underline (if a "_" is overstruck), 
-		 * bold (if an identical character is overstruck),
-		 * or just deletion of the character in the buffer.
-		 */
-		overstrike = utf_mode ? -1 : 0;
-		/* To be correct, this must be a base character.  */
-		prev_ch = get_wchar(linebuf + curr);
-		a = attr[curr];
-		if (ch == prev_ch)
-		{
-			/*
-			 * Overstriking a char with itself means make it bold.
-			 * But overstriking an underscore with itself is
-			 * ambiguous.  It could mean make it bold, or
-			 * it could mean make it underlined.
-			 * Use the previous overstrike to resolve it.
-			 */
-			if (ch == '_')
-			{
-				if ((a & (AT_BOLD|AT_UNDERLINE)) != AT_NORMAL)
-					a |= (AT_BOLD|AT_UNDERLINE);
-				else if (last_overstrike != AT_NORMAL)
-					a |= last_overstrike;
-				else
-					a |= AT_BOLD;
-			} else
-				a |= AT_BOLD;
-		} else if (ch == '_')
-		{
-			a |= AT_UNDERLINE;
-			ch = prev_ch;
-			rep = linebuf + curr;
-		} else if (prev_ch == '_')
-		{
-			a |= AT_UNDERLINE;
-		}
-		/* Else we replace prev_ch, but we keep its attributes.  */
-	} else if (overstrike < 0)
-	{
-		if (   is_composing_char(ch)
-		    || is_combining_char(get_wchar(linebuf + curr), ch))
-			/* Continuation of the same overstrike.  */
-			a = last_overstrike;
-		else
-			overstrike = 0;
-	}
-
-	if (ch == '\t') 
-	{
-		/*
-		 * Expand a tab into spaces.
-		 */
-		switch (bs_mode)
-		{
-		case BS_CONTROL:
-			goto do_control_char;
-		case BS_NORMAL:
-		case BS_SPECIAL:
-			STORE_TAB(a, pos);
-			break;
-		}
-	} else if ((!utf_mode || is_ascii_char(ch)) && control_char((char)ch))
-	{
-	do_control_char:
-		if (ctldisp == OPT_ON || (ctldisp == OPT_ONPLUS && IS_CSI_START(ch)))
-		{
-			/*
-			 * Output as a normal character.
-			 */
-			STORE_CHAR(ch, AT_NORMAL, rep, pos);
-		} else 
-		{
-			STORE_PRCHAR((char) ch, pos);
-		}
-	} else if (utf_mode && ctldisp != OPT_ON && is_ubin_char(ch))
-	{
-		char *s;
-
-		s = prutfchar(ch);
-
-		if (column + (int) strlen(s) - 1 +
-		    pwidth(' ', binattr, 0) + attr_ewidth(binattr) > sc_width)
-			return (1);
-
-		for ( ;  *s != 0;  s++)
-			STORE_CHAR(*s, AT_BINARY, NULL, pos);
- 	} else
-	{
-		STORE_CHAR(ch, a, rep, pos);
-	}
- 	return (0);
-}
-
-/*
- *
- */
-	public int
-pflushmbc()
-{
-	int r = 0;
-
-	if (mbc_buf_len > 0)
-	{
-		/* Flush incomplete (truncated) sequence.  */
-		r = flush_mbc_buf(mbc_pos);
-		mbc_buf_len = 0;
-	}
-	return r;
-}
-
-/*
- * Terminate the line in the line buffer.
- */
-	public void
-pdone(endline)
-	int endline;
-{
-	int nl;
-
-	(void) pflushmbc();
-
-	if (pendc && (pendc != '\r' || !endline))
-		/*
-		 * If we had a pending character, put it in the buffer.
-		 * But discard a pending CR if we are at end of line
-		 * (that is, discard the CR in a CR/LF sequence).
-		 */
-		(void) do_append(pendc, NULL, pendpos);
-
-	/*
-	 * Make sure we've shifted the line, if we need to.
-	 */
-	if (cshift < hshift)
-		pshift(hshift - cshift);
-
-	if (ctldisp == OPT_ONPLUS && is_ansi_end('m'))
-	{
-		/* Switch to normal attribute at end of line. */
-		char *p = "\033[m";
-		for ( ;  *p != '\0';  p++)
-		{
-			linebuf[curr] = *p;
-			attr[curr++] = AT_ANSI;
-		}
-	}
-
-	/*
-	 * Add a newline if necessary,
-	 * and append a '\0' to the end of the line.
-	 * We output a newline if we're not at the right edge of the screen,
-	 * or if the terminal doesn't auto wrap,
-	 * or if this is really the end of the line AND the terminal ignores
-	 * a newline at the right edge.
-	 * (In the last case we don't want to output a newline if the terminal 
-	 * doesn't ignore it since that would produce an extra blank line.
-	 * But we do want to output a newline if the terminal ignores it in case
-	 * the next line is blank.  In that case the single newline output for
-	 * that blank line would be ignored!)
-	 */
-	if (!oldbot)
-		nl = (column < sc_width || !auto_wrap || (endline && ignaw) || ctldisp == OPT_ON);
-	else
-		nl = (column < sc_width || !auto_wrap || ignaw || ctldisp == OPT_ON);
-	if (nl)
-	{
-		linebuf[curr] = '\n';
-		attr[curr] = AT_NORMAL;
-		curr++;
-	} 
-	else if (ignaw && !auto_wrap && column >= sc_width)
-	{
-		/*
-		 * Big horrible kludge.
-		 * No-wrap terminals are too hard to deal with when they get in
-		 * the state where a full screen width of characters have been 
-		 * output but the cursor is sitting on the right edge instead
-		 * of at the start of the next line.  
-		 * So after we output a full line, we output an extra 
-		 * space and backspace to force the cursor to the 
-		 * beginning of the next line, like a sane terminal.
-		 */
-		linebuf[curr] = ' '; 
-		attr[curr++] = AT_NORMAL;
-		linebuf[curr] = '\b'; 
-		attr[curr++] = AT_NORMAL;
-	}
-	linebuf[curr] = '\0';
-	attr[curr] = AT_NORMAL;
-
-#if HILITE_SEARCH
-	if (status_col && line_matches > 0)
-	{
-		linebuf[0] = '*';
-		attr[0] = AT_NORMAL|AT_HILITE;
-	}
-#endif
-}
-
-/*
- * Get a character from the current line.
- * Return the character as the function return value,
- * and the character attribute in *ap.
- */
-	public int
-gline(i, ap)
-	register int i;
-	register int *ap;
-{
-	if (is_null_line)
-	{
-		/*
-		 * If there is no current line, we pretend the line is
-		 * either "~" or "", depending on the "twiddle" flag.
-		 */
-		if (twiddle)
-		{
-			if (i == 0)
-			{
-				*ap = AT_BOLD;
-				return '~';
-			}
-			--i;
-		}
-		/* Make sure we're back to AT_NORMAL before the '\n'.  */
-		*ap = AT_NORMAL;
-		return i ? '\0' : '\n';
-	}
-
-	*ap = attr[i];
-	return (linebuf[i] & 0xFF);
-}
-
-/*
- * Indicate that there is no current line.
- */
-	public void
-null_line()
-{
-	is_null_line = 1;
-	cshift = 0;
-}
-
-/*
- * Analogous to forw_line(), but deals with "raw lines":
- * lines which are not split for screen width.
- * {{ This is supposed to be more efficient than forw_line(). }}
- */
-	public POSITION
-forw_raw_line(curr_pos, linep, line_lenp)
-	POSITION curr_pos;
-	char **linep;
-	int *line_lenp;
-{
-	register int n;
-	register int c;
-	POSITION new_pos;
-
-	if (curr_pos == NULL_POSITION || ch_seek(curr_pos) ||
-		(c = ch_forw_get()) == EOI)
-		return (NULL_POSITION);
-
-	n = 0;
-	for (;;)
-	{
-		if (c == '\n' || c == EOI || ABORT_SIGS())
-		{
-			new_pos = ch_tell();
-			break;
-		}
-		if (n >= size_linebuf-1)
-		{
-			if (expand_linebuf())
-			{
-				/*
-				 * Overflowed the input buffer.
-				 * Pretend the line ended here.
-				 */
-				new_pos = ch_tell() - 1;
-				break;
-			}
-		}
-		linebuf[n++] = c;
-		c = ch_forw_get();
-	}
-	linebuf[n] = '\0';
-	if (linep != NULL)
-		*linep = linebuf;
-	if (line_lenp != NULL)
-		*line_lenp = n;
-	return (new_pos);
-}
-
-/*
- * Analogous to back_line(), but deals with "raw lines".
- * {{ This is supposed to be more efficient than back_line(). }}
- */
-	public POSITION
-back_raw_line(curr_pos, linep, line_lenp)
-	POSITION curr_pos;
-	char **linep;
-	int *line_lenp;
-{
-	register int n;
-	register int c;
-	POSITION new_pos;
-
-	if (curr_pos == NULL_POSITION || curr_pos <= ch_zero() ||
-		ch_seek(curr_pos-1))
-		return (NULL_POSITION);
-
-	n = size_linebuf;
-	linebuf[--n] = '\0';
-	for (;;)
-	{
-		c = ch_back_get();
-		if (c == '\n' || ABORT_SIGS())
-		{
-			/*
-			 * This is the newline ending the previous line.
-			 * We have hit the beginning of the line.
-			 */
-			new_pos = ch_tell() + 1;
-			break;
-		}
-		if (c == EOI)
-		{
-			/*
-			 * We have hit the beginning of the file.
-			 * This must be the first line in the file.
-			 * This must, of course, be the beginning of the line.
-			 */
-			new_pos = ch_zero();
-			break;
-		}
-		if (n <= 0)
-		{
-			int old_size_linebuf = size_linebuf;
-			char *fm;
-			char *to;
-			if (expand_linebuf())
-			{
-				/*
-				 * Overflowed the input buffer.
-				 * Pretend the line ended here.
-				 */
-				new_pos = ch_tell() + 1;
-				break;
-			}
-			/*
-			 * Shift the data to the end of the new linebuf.
-			 */
-			for (fm = linebuf + old_size_linebuf - 1,
-			      to = linebuf + size_linebuf - 1;
-			     fm >= linebuf;  fm--, to--)
-				*to = *fm;
-			n = size_linebuf - old_size_linebuf;
-		}
-		linebuf[--n] = c;
-	}
-	if (linep != NULL)
-		*linep = &linebuf[n];
-	if (line_lenp != NULL)
-		*line_lenp = size_linebuf - 1 - n;
-	return (new_pos);
-}