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Improve handling of ambiguous overstrike sequences. A sequence of _\b_
can either mean an underlined underscore or a bold underscore. This
ambiguity can be 'resolved' by takeing the state of the surrounding text
into account. If surrounded by bold text, the result should probably be
bold and likewise for underlined. less(1) previously only looked at the
preceding text and ul(1) didn't examine the context at all.

tweaks and ok schwarze
ok tb (on a previous version of the diff)

/*
 * Copyright (C) 1984-2012  Mark Nudelman
 * Modified for use with illumos by Garrett D'Amore.
 * Copyright 2014 Garrett D'Amore <garrett@damore.org>
 *
 * 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, see the README file.
 */

/*
 * Standard include file for "less".
 */

#include "defines.h"

#include <sys/types.h>

#include <ctype.h>
#include <fcntl.h>
#include <libgen.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <wctype.h>

/*
 * Simple lowercase test which can be used during option processing
 * (before options are parsed which might tell us what charset to use).
 */

#undef IS_SPACE
#undef IS_DIGIT

#define	IS_SPACE(c)	isspace((unsigned char)(c))
#define	IS_DIGIT(c)	isdigit((unsigned char)(c))

#define	IS_CSI_START(c)	(((LWCHAR)(c)) == ESC || (((LWCHAR)(c)) == CSI))

#ifndef TRUE
#define	TRUE		1
#endif
#ifndef FALSE
#define	FALSE		0
#endif

#define	OPT_OFF		0
#define	OPT_ON		1
#define	OPT_ONPLUS	2

/*
 * Special types and constants.
 */
typedef unsigned long LWCHAR;
#define	MIN_LINENUM_WIDTH  7	/* Min printing width of a line number */
#define	MAX_UTF_CHAR_LEN   6	/* Max bytes in one UTF-8 char */

#define	SHELL_META_QUEST 1

/*
 * An IFILE represents an input file.
 */
#define	IFILE		void *

/*
 * The structure used to represent a "screen position".
 * This consists of a file position, and a screen line number.
 * The meaning is that the line starting at the given file
 * position is displayed on the ln-th line of the screen.
 * (Screen lines before ln are empty.)
 */
struct scrpos {
	off_t pos;
	int ln;
};

typedef union parg {
	char *p_string;
	int p_int;
	off_t p_linenum;
} PARG;

struct textlist {
	char *string;
	char *endstring;
};

#define	EOI		(-1)

#define	READ_INTR	(-2)

/* A fraction is represented by an int n; the fraction is n/NUM_FRAC_DENOM */
#define	NUM_FRAC_DENOM			1000000
#define	NUM_LOG_FRAC_DENOM		6

/* How quiet should we be? */
#define	NOT_QUIET	0	/* Ring bell at eof and for errors */
#define	LITTLE_QUIET	1	/* Ring bell only for errors */
#define	VERY_QUIET	2	/* Never ring bell */

/* How should we prompt? */
#define	PR_SHORT	0	/* Prompt with colon */
#define	PR_MEDIUM	1	/* Prompt with message */
#define	PR_LONG		2	/* Prompt with longer message */

/* How should we handle backspaces? */
#define	BS_SPECIAL	0	/* Do special things for underlining and bold */
#define	BS_NORMAL	1	/* \b treated as normal char; actually output */
#define	BS_CONTROL	2	/* \b treated as control char; prints as ^H */

/* How should we search? */
#define	SRCH_FORW	(1 << 0)  /* Search forward from current position */
#define	SRCH_BACK	(1 << 1)  /* Search backward from current position */
#define	SRCH_NO_MOVE	(1 << 2)  /* Highlight, but don't move */
#define	SRCH_FIND_ALL	(1 << 4)  /* Find and highlight all matches */
#define	SRCH_NO_MATCH	(1 << 8)  /* Search for non-matching lines */
#define	SRCH_PAST_EOF	(1 << 9)  /* Search past end-of-file, into next file */
#define	SRCH_FIRST_FILE	(1 << 10) /* Search starting at the first file */
#define	SRCH_NO_REGEX	(1 << 12) /* Don't use regular expressions */
#define	SRCH_FILTER	(1 << 13) /* Search is for '&' (filter) command */
#define	SRCH_AFTER_TARGET (1 << 14) /* Start search after the target line */

#define	SRCH_REVERSE(t)	(((t) & SRCH_FORW) ? \
				(((t) & ~SRCH_FORW) | SRCH_BACK) : \
				(((t) & ~SRCH_BACK) | SRCH_FORW))

/* */
#define	NO_MCA		0
#define	MCA_DONE	1
#define	MCA_MORE	2

#define	CC_OK		0	/* Char was accepted & processed */
#define	CC_QUIT		1	/* Char was a request to abort current cmd */
#define	CC_ERROR	2	/* Char could not be accepted due to error */
#define	CC_PASS		3	/* Char was rejected (internal) */

#define	CF_QUIT_ON_ERASE 0001   /* Abort cmd if its entirely erased */

/* Special char bit-flags used to tell put_line() to do something special */
#define	AT_NORMAL	(0)
#define	AT_UNDERLINE	(1 << 0)
#define	AT_BOLD		(1 << 1)
#define	AT_BLINK	(1 << 2)
#define	AT_STANDOUT	(1 << 3)
#define	AT_ANSI		(1 << 4)  /* Content-supplied "ANSI" escape sequence */
#define	AT_BINARY	(1 << 5)  /* LESS*BINFMT representation */
#define	AT_HILITE	(1 << 6)  /* Internal highlights (e.g., for search) */
#define	AT_INDET	(1 << 7)  /* Indeterminate: either bold or underline */

#define	CONTROL(c)	((c)&037)

#define	ESC		CONTROL('[')
#define	CSI		((unsigned char)'\233')

#define	S_INTERRUPT	01
#define	S_STOP		02
#define	S_WINCH		04
#define	ABORT_SIGS()	(sigs & (S_INTERRUPT|S_STOP))

#define	QUIT_OK		0
#define	QUIT_ERROR	1
#define	QUIT_INTERRUPT	2
#define	QUIT_SAVED_STATUS (-1)

#define	FOLLOW_DESC	0
#define	FOLLOW_NAME	1

/* filestate flags */
#define	CH_CANSEEK	001
#define	CH_KEEPOPEN	002
#define	CH_POPENED	004
#define	CH_HELPFILE	010
#define	CH_NODATA	020	/* Special case for zero length files */


#define	ch_zero()	(0)

#define	FAKE_EMPTYFILE	"@/\\less/\\empty/\\file/\\@"

/* Flags for cvt_text */
#define	CVT_TO_LC	01	/* Convert upper-case to lower-case */
#define	CVT_BS		02	/* Do backspace processing */
#define	CVT_CRLF	04	/* Remove CR after LF */
#define	CVT_ANSI	010	/* Remove ANSI escape sequences */

#include "funcs.h"

/* Functions not included in funcs.h */
void postoa(off_t, char *, size_t);
void inttoa(int, char *, size_t);