Added new old escape sequence \*[nn].

Initial correct .Bd support (still only text in literal displays).
Symbols put into tables (character-encoding).

1 files changed, 451 insertions, 381 deletions

diff --git a/mdocterm.c b/mdocterm.c
index 98ad4cd3..0f2f3b5f 100644
--- a/mdocterm.c
+++ b/mdocterm.c
@@ -25,7 +25,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-
 #ifndef __OpenBSD__
 #include <time.h>
 #endif
@@ -33,46 +32,6 @@
 #include "mmain.h"
 #include "term.h"
 
-#define	TERMSYM_RBRACK		"]"
-#define	TERMSYM_LBRACK		"["
-#define	TERMSYM_LARROW		"<-"
-#define	TERMSYM_RARROW		"->"
-#define	TERMSYM_UARROW		"^"
-#define	TERMSYM_DARROW		"v"
-#define	TERMSYM_LSQUOTE		"`"
-#define	TERMSYM_RSQUOTE		"\'"
-#define	TERMSYM_SQUOTE		"\'"
-#define	TERMSYM_LDQUOTE		"``"
-#define	TERMSYM_RDQUOTE		"\'\'"
-#define	TERMSYM_DQUOTE		"\""
-#define	TERMSYM_LT		"<"
-#define	TERMSYM_GT		">"
-#define	TERMSYM_LE		"<="
-#define	TERMSYM_GE		">="
-#define	TERMSYM_EQ		"=="
-#define	TERMSYM_NEQ		"!="
-#define	TERMSYM_ACUTE		"\'"
-#define	TERMSYM_GRAVE		"`"
-#define	TERMSYM_PI		"pi"
-#define	TERMSYM_PLUSMINUS	"+="
-#define	TERMSYM_INF		"oo"
-#define	TERMSYM_INF2		"infinity"
-#define	TERMSYM_NAN		"NaN"
-#define	TERMSYM_BAR		"|"
-#define	TERMSYM_BULLET		"o"
-
-#ifdef __NetBSD__
-#define xisspace(x) isspace((int)(x))
-#else
-#define	xisspace(x) isspace((x))
-#endif
-
-enum	termstyle {
-	STYLE_CLEAR,
-	STYLE_BOLD,
-	STYLE_UNDERLINE
-};
-
 static	void		  body(struct termp *,
 				struct termpair *,
 				const struct mdoc_meta *,
@@ -83,20 +42,63 @@ static	void		  footer(struct termp *,
 				const struct mdoc_meta *);
 
 static	void		  pword(struct termp *, const char *, size_t);
-static	void		  pescape(struct termp *, 
-				const char *, size_t *, size_t);
-static	void		  pgraph(struct termp *, char);
-static	void		  nescape(struct termp *, 
+static	void		  pescape(struct termp *, const char *, 
+				size_t *, size_t);
+static	void		  style(struct termp *, enum tstyle);
+static	void		  nescape(struct termp *,
 				const char *, size_t);
 static	void		  chara(struct termp *, char);
-static	void		  stringa(struct termp *, const char *);
-static	void		  style(struct termp *, enum termstyle);
+static	void		  stringa(struct termp *, 
+				const char *, size_t);
+static	void		  symbola(struct termp *, enum tsym);
 
 #ifdef __linux__
 extern	size_t		  strlcat(char *, const char *, size_t);
 extern	size_t		  strlcpy(char *, const char *, size_t);
 #endif
 
+static	struct termsym	  termsym_ansi[] = {
+	{ "]", 1 },		/* TERMSYM_RBRACK */
+	{ "[", 1 },		/* TERMSYM_LBRACK */
+	{ "<-", 2 },		/* TERMSYM_LARROW */
+	{ "->", 2 },		/* TERMSYM_RARROW */
+	{ "^", 1 },		/* TERMSYM_UARROW */
+	{ "v", 1 },		/* TERMSYM_DARROW */
+	{ "`", 1 },		/* TERMSYM_LSQUOTE */
+	{ "\'", 1 },		/* TERMSYM_RSQUOTE */
+	{ "\'", 1 },		/* TERMSYM_SQUOTE */
+	{ "``", 2 },		/* TERMSYM_LDQUOTE */
+	{ "\'\'", 2 },		/* TERMSYM_RDQUOTE */
+	{ "\"", 1 },		/* TERMSYM_DQUOTE */
+	{ "<", 1 },		/* TERMSYM_LT */
+	{ ">", 1 },		/* TERMSYM_GT */
+	{ "<=", 2 },		/* TERMSYM_LE */
+	{ ">=", 2 },		/* TERMSYM_GE */
+	{ "==", 2 },		/* TERMSYM_EQ */
+	{ "!=", 2 },		/* TERMSYM_NEQ */
+	{ "\'", 1 },		/* TERMSYM_ACUTE */
+	{ "`", 1 },		/* TERMSYM_GRAVE */
+	{ "pi", 2 },		/* TERMSYM_PI */
+	{ "+=", 2 },		/* TERMSYM_PLUSMINUS */
+	{ "oo", 2 },		/* TERMSYM_INF */
+	{ "infinity", 8 },	/* TERMSYM_INF2 */
+	{ "NaN", 3 },		/* TERMSYM_NAN */
+	{ "|", 1 },		/* TERMSYM_BAR */
+	{ "o", 1 },		/* TERMSYM_BULLET */
+	{ "&", 1 },		/* TERMSYM_AND */
+	{ "|", 1 },		/* TERMSYM_OR */
+};
+
+static	const char	  ansi_clear[]  = { 27, '[', '0', 'm' };
+static	const char	  ansi_bold[]  = { 27, '[', '1', 'm' };
+static	const char	  ansi_under[]  = { 27, '[', '4', 'm' };
+
+static	struct termsym	  termstyle_ansi[] = {
+	{ ansi_clear, 4 },
+	{ ansi_bold, 4 },
+	{ ansi_under, 4 }
+};
+
 
 int
 main(int argc, char *argv[])
@@ -118,6 +120,8 @@ main(int argc, char *argv[])
 	termp.maxcols = 1024;
 	termp.offset = termp.col = 0;
 	termp.flags = TERMP_NOSPACE;
+	termp.symtab = termsym_ansi;
+	termp.styletab = termstyle_ansi;
 
 	if (NULL == (termp.buf = malloc(termp.maxcols)))
 		err(1, "malloc");
@@ -133,10 +137,45 @@ main(int argc, char *argv[])
 }
 
 
+/*
+ * Flush a line of text.  A "line" is loosely defined as being something
+ * that should be followed by a newline, regardless of whether it's
+ * broken apart by newlines getting there.  A line can also be a
+ * fragment of a columnar list.
+ *
+ * Specifically, a line is whatever's in p->buf of length p->col, which
+ * is zeroed after this function returns.
+ *
+ * The variables TERMP_NOLPAD, TERMP_LITERAL and TERMP_NOBREAK are of
+ * critical importance here.  Their behaviour follows:
+ *
+ *  - TERMP_NOLPAD: when beginning to write the line, don't left-pad the
+ *    offset value.  This is useful when doing columnar lists where the
+ *    prior column has right-padded.
+ *
+ *  - TERMP_LITERAL: don't break apart words.  Note that a long literal
+ *    word will violate the right margin.
+ *
+ *  - TERMP_NOBREAK: this is the most important and is used when making
+ *    columns.  In short: don't print a newline and instead pad to the
+ *    right margin.  Used in conjunction with TERMP_NOLPAD.
+ *
+ *  In-line line breaking:
+ *
+ *  If TERMP_NOBREAK is specified and the line overruns the right
+ *  margin, it will break and pad-right to the right margin after
+ *  writing.  If maxrmargin is violated, it will break and continue
+ *  writing from the right-margin, which will lead to the above
+ *  scenario upon exit.
+ *
+ *  Otherwise, the line will break at the right margin.  Extremely long
+ *  lines will cause the system to emit a warning (TODO: hyphenate, if
+ *  possible).
+ */
 void
 flushln(struct termp *p)
 {
-	size_t		 i, j, vsz, vis, maxvis;
+	size_t		 i, j, vsz, vis, maxvis, mmax, bp;
 
 	/*
 	 * First, establish the maximum columns of "visible" content.
@@ -147,6 +186,8 @@ flushln(struct termp *p)
 
 	assert(p->offset < p->rmargin);
 	maxvis = p->rmargin - p->offset;
+	mmax = p->maxrmargin - p->offset;
+	bp = TERMP_NOBREAK & p->flags ? mmax : maxvis;
 	vis = 0;
 
 	/*
@@ -160,17 +201,6 @@ flushln(struct termp *p)
 		for (j = 0; j < p->offset; j++)
 			putchar(' ');
 
-	/*
-	 * If we're literal, print out verbatim.
-	 */
-	if (p->flags & TERMP_LITERAL) {
-		for (i = 0; i < p->col; i++)
-			putchar(p->buf[i]);
-		putchar('\n');
-		p->col = 0;
-		return;
-	}
-
 	for (i = 0; i < p->col; i++) {
 		/*
 		 * Count up visible word characters.  Control sequences
@@ -179,9 +209,11 @@ flushln(struct termp *p)
 		 * space is printed according to regular spacing rules).
 		 */
 
+		/* FIXME: make non-ANSI friendly. */
+
 		/* LINTED */
 		for (j = i, vsz = 0; j < p->col; j++) {
-			if (xisspace(p->buf[j]))
+			if (isspace((int)p->buf[j]))
 				break;
 			else if (27 == p->buf[j]) {
 				assert(j + 4 <= p->col);
@@ -191,51 +223,59 @@ flushln(struct termp *p)
 		}
 
 		/*
-		 * If we're breaking normally...
-		 *
-		 * If a word is too long and we're within a line, put it
-		 * on the next line.  Puke if we're being asked to write
-		 * something that will exceed the right margin (i.e.,
-		 * from a fresh line).
-		 *
-		 * If we're not breaking...
-		 *
-		 * Don't let the visible size exceed the full right
-		 * margin.
+		 * Do line-breaking.  If we're greater than our
+		 * break-point and already in-line, break to the next
+		 * line and start writing.  If we're at the line start,
+		 * then write out the word (TODO: hyphenate) and break
+		 * in a subsequent loop invocation.
 		 */
 
 		if ( ! (TERMP_NOBREAK & p->flags)) {
-			if (vis && vis + vsz > maxvis) {
+			if (vis && vis + vsz > bp) {
 				putchar('\n');
 				for (j = 0; j < p->offset; j++)
 					putchar(' ');
 				vis = 0;
-			} else if (vis + vsz > maxvis)
-				errx(1, "word breaks right margin");
-		} else if (vis + vsz > p->maxrmargin - p->offset) {
-			putchar('\n');
-			for (j = 0; j < p->rmargin; j++)
-				putchar(' ');
-			vis = p->rmargin;
+			} else if (vis + vsz > bp)
+				warnx("word breaks right margin");
+
+			/* TODO: hyphenate. */
+
+		} else {
+			if (vis && vis + vsz > bp) {
+				putchar('\n');
+				for (j = 0; j < p->rmargin; j++)
+					putchar(' ');
+				vis = p->rmargin;
+			} else if (vis + vsz > bp) 
+				warnx("word breaks right margin");
+
+			/* TODO: hyphenate. */
 		}
 
 		/* 
 		 * Write out the word and a trailing space.  Omit the
-		 * space if we're the last word in the line.
+		 * space if we're the last word in the line or beyond
+		 * our breakpoint.
 		 */
 
 		for ( ; i < p->col; i++) {
-			if (xisspace(p->buf[i]))
+			if (isspace((int)p->buf[i]))
 				break;
 			putchar(p->buf[i]);
 		}
 		vis += vsz;
-		if (i < p->col) {
+		if (i < p->col && vis <= bp) {
 			putchar(' ');
 			vis++;
 		}
 	}
 
+	/*
+	 * If we've overstepped our maximum visible no-break space, then
+	 * cause a newline and offset at the right margin.
+	 */
+
 	if ((TERMP_NOBREAK & p->flags) && vis >= maxvis) {
 		putchar('\n');
 		for (i = 0; i < p->rmargin; i++)
@@ -259,14 +299,15 @@ flushln(struct termp *p)
 }
 
 
+/* 
+ * A newline only breaks an existing line; it won't assert vertical
+ * space.  All data in the output buffer is flushed prior to the newline
+ * assertion.
+ */
 void
 newln(struct termp *p)
 {
 
-	/* 
-	 * A newline only breaks an existing line; it won't assert
-	 * vertical space.
-	 */
 	p->flags |= TERMP_NOSPACE;
 	if (0 == p->col) {
 		p->flags &= ~TERMP_NOLPAD;
@@ -277,307 +318,32 @@ newln(struct termp *p)
 }
 
 
+/*
+ * Asserts a vertical space (a full, empty line-break between lines).
+ * Note that if used twice, this will cause two blank spaces and so on.
+ * All data in the output buffer is flushed prior to the newline
+ * assertion.
+ */
 void
 vspace(struct termp *p)
 {
 
-	/*
-	 * Asserts a vertical space (a full, empty line-break between
-	 * lines).
-	 */
 	newln(p);
 	putchar('\n');
 }
 
 
-static void
-stringa(struct termp *p, const char *s)
-{
-
-	/* XXX - speed up if not passing to chara. */
-	for ( ; *s; s++)
-		chara(p, *s);
-}
-
-
-static void
-chara(struct termp *p, char c)
-{
-
-	/*
-	 * Insert a single character into the line-buffer.  If the
-	 * buffer's space is exceeded, then allocate more space.
-	 */
-	if (p->col + 1 >= p->maxcols) {
-		p->buf = realloc(p->buf, p->maxcols * 2);
-		if (NULL == p->buf)
-			err(1, "malloc");
-		p->maxcols *= 2;
-	}
-	p->buf[(p->col)++] = c;
-}
-
-
-static void
-style(struct termp *p, enum termstyle esc)
-{
-
-	if (p->col + 4 >= p->maxcols)
-		errx(1, "line overrun");
-
-	p->buf[(p->col)++] = 27;
-	p->buf[(p->col)++] = '[';
-	switch (esc) {
-	case (STYLE_CLEAR):
-		p->buf[(p->col)++] = '0';
-		break;
-	case (STYLE_BOLD):
-		p->buf[(p->col)++] = '1';
-		break;
-	case (STYLE_UNDERLINE):
-		p->buf[(p->col)++] = '4';
-		break;
-	default:
-		abort();
-		/* NOTREACHED */
-	}
-	p->buf[(p->col)++] = 'm';
-}
-
-
-static void
-nescape(struct termp *p, const char *word, size_t len)
-{
-
-	switch (len) {
-	case (1):
-		if ('q' == word[0])
-			stringa(p, TERMSYM_DQUOTE);
-		break;
-	case (2):
-		if ('r' == word[0] && 'B' == word[1])
-			stringa(p, TERMSYM_RBRACK);
-		else if ('l' == word[0] && 'B' == word[1])
-			stringa(p, TERMSYM_LBRACK);
-		else if ('l' == word[0] && 'q' == word[1])
-			stringa(p, TERMSYM_LDQUOTE);
-		else if ('r' == word[0] && 'q' == word[1])
-			stringa(p, TERMSYM_RDQUOTE);
-		else if ('o' == word[0] && 'q' == word[1])
-			stringa(p, TERMSYM_LSQUOTE);
-		else if ('a' == word[0] && 'q' == word[1])
-			stringa(p, TERMSYM_RSQUOTE);
-		else if ('<' == word[0] && '-' == word[1])
-			stringa(p, TERMSYM_LARROW);
-		else if ('-' == word[0] && '>' == word[1])
-			stringa(p, TERMSYM_RARROW);
-		else if ('b' == word[0] && 'u' == word[1])
-			stringa(p, TERMSYM_BULLET);
-		else if ('<' == word[0] && '=' == word[1])
-			stringa(p, TERMSYM_LE);
-		else if ('>' == word[0] && '=' == word[1])
-			stringa(p, TERMSYM_GE);
-		else if ('=' == word[0] && '=' == word[1])
-			stringa(p, TERMSYM_EQ);
-		else if ('+' == word[0] && '-' == word[1])
-			stringa(p, TERMSYM_PLUSMINUS);
-		else if ('u' == word[0] && 'a' == word[1])
-			stringa(p, TERMSYM_UARROW);
-		else if ('d' == word[0] && 'a' == word[1])
-			stringa(p, TERMSYM_DARROW);
-		else if ('a' == word[0] && 'a' == word[1])
-			stringa(p, TERMSYM_ACUTE);
-		else if ('g' == word[0] && 'a' == word[1])
-			stringa(p, TERMSYM_GRAVE);
-		else if ('!' == word[0] && '=' == word[1])
-			stringa(p, TERMSYM_NEQ);
-		else if ('i' == word[0] && 'f' == word[1])
-			stringa(p, TERMSYM_INF);
-		else if ('n' == word[0] && 'a' == word[1])
-			stringa(p, TERMSYM_NAN);
-		else if ('b' == word[0] && 'a' == word[1])
-			stringa(p, TERMSYM_BAR);
-
-		/* Deprecated forms. */
-		else if ('B' == word[0] && 'a' == word[1])
-			stringa(p, TERMSYM_BAR);
-		else if ('I' == word[0] && 'f' == word[1])
-			stringa(p, TERMSYM_INF2);
-		else if ('G' == word[0] && 'e' == word[1])
-			stringa(p, TERMSYM_GE);
-		else if ('G' == word[0] && 't' == word[1])
-			stringa(p, TERMSYM_GT);
-		else if ('L' == word[0] && 'e' == word[1])
-			stringa(p, TERMSYM_LE);
-		else if ('L' == word[0] && 'q' == word[1])
-			stringa(p, TERMSYM_LDQUOTE);
-		else if ('L' == word[0] && 't' == word[1])
-			stringa(p, TERMSYM_LT);
-		else if ('N' == word[0] && 'a' == word[1])
-			stringa(p, TERMSYM_NAN);
-		else if ('N' == word[0] && 'e' == word[1])
-			stringa(p, TERMSYM_NEQ);
-		else if ('P' == word[0] && 'i' == word[1])
-			stringa(p, TERMSYM_PI);
-		else if ('P' == word[0] && 'm' == word[1])
-			stringa(p, TERMSYM_PLUSMINUS);
-		else if ('R' == word[0] && 'q' == word[1])
-			stringa(p, TERMSYM_RDQUOTE);
-		break;
-	default:
-		break;
-	}
-}
-
-
-static void
-pgraph(struct termp *p, char byte)
-{
-	int		 i;
-
-	switch (byte) {
-	case (' '):
-		chara(p, ' ');
-		break;
-	case ('\t'):
-		for (i = 0; i < INDENT; i++)
-			chara(p, ' ');
-		break;
-	default:
-		warnx("unknown non-graphing character");
-		break;
-	}
-}
-
-
-static void
-pescape(struct termp *p, const char *word, size_t *i, size_t len)
-{
-	size_t		 j;
-
-	(*i)++;
-	assert(*i < len);
-
-	/*
-	 * Handle an escape sequence.  This must manage both groff-style
-	 * escapes and mdoc-style escapes.
-	 */
-
-	if ('(' == word[*i]) {
-		/* Two-character escapes. */
-		(*i)++;
-		assert(*i + 1 < len);
-		nescape(p, &word[*i], 2);
-		(*i)++;
-		return;
-
-	} else if ('*' == word[*i]) { 
-		(*i)++;
-		assert(*i < len);
-		switch (word[*i]) {
-		case ('('):
-			(*i)++;
-			assert(*i + 1 < len);
-			nescape(p, &word[*i], 2);
-			(*i)++;
-			return;
-		default:
-			break;
-		}
-		nescape(p, &word[*i], 1);
-		return;
-
-	} else if ('[' != word[*i]) {
-		/* One-character escapes. */
-		switch (word[*i]) {
-		case ('\\'):
-			/* FALLTHROUGH */
-		case ('\''):
-			/* FALLTHROUGH */
-		case ('`'):
-			/* FALLTHROUGH */
-		case ('-'):
-			/* FALLTHROUGH */
-		case (' '):
-			/* FALLTHROUGH */
-		case ('.'):
-			chara(p, word[*i]);
-			break;
-		case ('e'):
-			chara(p, '\\');
-			break;
-		default:
-			break;
-		}
-		return;
-	}
-
-	(*i)++;
-	for (j = 0; word[*i] && ']' != word[*i]; (*i)++, j++)
-		/* Loop... */ ;
-
-	nescape(p, &word[*i - j], j);
-}
-
-
-static void
-pword(struct termp *p, const char *word, size_t len)
-{
-	size_t		 i;
-
-	/*
-	 * Handle pwords, partial words, which may be either a single
-	 * word or a phrase that cannot be broken down (such as a
-	 * literal string).  This handles word styling.
-	 */
-
-	if ( ! (p->flags & TERMP_NOSPACE) && 
-			! (p->flags & TERMP_LITERAL))
-		chara(p, ' ');
-
-	if ( ! (p->flags & TERMP_NONOSPACE))
-		p->flags &= ~TERMP_NOSPACE;
-
-	/* 
-	 * XXX - if literal and underlining, this will underline the
-	 * spaces between literal words. 
-	 */
-
-	if (p->flags & TERMP_BOLD)
-		style(p, STYLE_BOLD);
-	if (p->flags & TERMP_UNDERLINE)
-		style(p, STYLE_UNDERLINE);
-
-	for (i = 0; i < len; i++) {
-		if ('\\' == word[i]) {
-			pescape(p, word, &i, len);
-			continue;
-		}
-		if ( ! isgraph((int)word[i])) {
-			pgraph(p, word[i]);
-			continue;
-		}
-		chara(p, word[i]);
-	}
-
-	if (p->flags & TERMP_BOLD ||
-			p->flags & TERMP_UNDERLINE)
-		style(p, STYLE_CLEAR);
-}
-
-
+/*
+ * Break apart a word into "pwords" (partial-words, usually from
+ * breaking up a phrase into individual words) and, eventually, put them
+ * into the output buffer.  If we're a literal word, then don't break up
+ * the word and put it verbatim into the output buffer.
+ */
 void
 word(struct termp *p, const char *word)
 {
 	size_t 		 i, j, len;
 
-	/*
-	 * Break apart a word into tokens.  If we're a literal word,
-	 * then don't.  This doesn't handle zero-length words (there
-	 * should be none) and makes sure that pword doesn't get spaces
-	 * or nil words unless literal.
-	 */
-
 	if (p->flags & TERMP_LITERAL) {
 		pword(p, word, strlen(word));
 		return;
@@ -594,13 +360,14 @@ word(struct termp *p, const char *word)
 
 	/* LINTED */
 	for (j = i = 0; i < len; i++) {
-		if ( ! xisspace(word[i])) {
+		if ( ! isspace((int)word[i])) {
 			j++;
 			continue;
 		} 
 		
 		/* Escaped spaces don't delimit... */
-		if (i > 0 && xisspace(word[i]) && '\\' == word[i - 1]) {
+		if (i > 0 && isspace((int)word[i]) && 
+				'\\' == word[i - 1]) {
 			j++;
 			continue;
 		}
@@ -618,6 +385,12 @@ word(struct termp *p, const char *word)
 }
 
 
+/*
+ * This is the main function for printing out nodes.  It's constituted
+ * of PRE and POST functions, which correspond to prefix and infix
+ * processing.  The termpair structure allows data to persist between
+ * prefix and postfix invocations.
+ */
 static void
 body(struct termp *p, struct termpair *ppair,
 		const struct mdoc_meta *meta,
@@ -626,12 +399,6 @@ body(struct termp *p, struct termpair *ppair,
 	int		 dochild;
 	struct termpair	 pair;
 
-	/*
-	 * This is the main function for printing out nodes.  It's
-	 * constituted of PRE and POST functions, which correspond to
-	 * prefix and infix processing.
-	 */
-
 	/* Pre-processing. */
 
 	dochild = 1;
@@ -837,3 +604,306 @@ header(struct termp *p, const struct mdoc_meta *meta)
 	free(vbuf);
 	free(buf);
 }
+
+
+/*
+ * Determine the symbol indicated by an escape sequences, that is, one
+ * starting with a backslash.  Once done, we pass this value into the
+ * output buffer by way of the symbol table.
+ */
+static void
+nescape(struct termp *p, const char *word, size_t len)
+{
+
+	switch (len) {
+	case (1):
+		switch (word[0]) {
+		case ('\\'):
+			/* FALLTHROUGH */
+		case ('\''):
+			/* FALLTHROUGH */
+		case ('`'):
+			/* FALLTHROUGH */
+		case ('-'):
+			/* FALLTHROUGH */
+		case (' '):
+			/* FALLTHROUGH */
+		case ('.'):
+			chara(p, word[0]); /* FIXME */
+			break;
+		case ('&'):
+			break;
+		case ('e'):
+			chara(p, '\\'); /* FIXME */
+			break;
+		case ('q'):
+			symbola(p, TERMSYM_DQUOTE);
+			break;
+		default:
+			warnx("escape sequence not supported: %c",
+					word[0]);
+			break;
+		}
+		break;
+
+	case (2):
+		if ('r' == word[0] && 'B' == word[1])
+			symbola(p, TERMSYM_RBRACK);
+		else if ('l' == word[0] && 'B' == word[1])
+			symbola(p, TERMSYM_LBRACK);
+		else if ('l' == word[0] && 'q' == word[1])
+			symbola(p, TERMSYM_LDQUOTE);
+		else if ('r' == word[0] && 'q' == word[1])
+			symbola(p, TERMSYM_RDQUOTE);
+		else if ('o' == word[0] && 'q' == word[1])
+			symbola(p, TERMSYM_LSQUOTE);
+		else if ('a' == word[0] && 'q' == word[1])
+			symbola(p, TERMSYM_RSQUOTE);
+		else if ('<' == word[0] && '-' == word[1])
+			symbola(p, TERMSYM_LARROW);
+		else if ('-' == word[0] && '>' == word[1])
+			symbola(p, TERMSYM_RARROW);
+		else if ('b' == word[0] && 'u' == word[1])
+			symbola(p, TERMSYM_BULLET);
+		else if ('<' == word[0] && '=' == word[1])
+			symbola(p, TERMSYM_LE);
+		else if ('>' == word[0] && '=' == word[1])
+			symbola(p, TERMSYM_GE);
+		else if ('=' == word[0] && '=' == word[1])
+			symbola(p, TERMSYM_EQ);
+		else if ('+' == word[0] && '-' == word[1])
+			symbola(p, TERMSYM_PLUSMINUS);
+		else if ('u' == word[0] && 'a' == word[1])
+			symbola(p, TERMSYM_UARROW);
+		else if ('d' == word[0] && 'a' == word[1])
+			symbola(p, TERMSYM_DARROW);
+		else if ('a' == word[0] && 'a' == word[1])
+			symbola(p, TERMSYM_ACUTE);
+		else if ('g' == word[0] && 'a' == word[1])
+			symbola(p, TERMSYM_GRAVE);
+		else if ('!' == word[0] && '=' == word[1])
+			symbola(p, TERMSYM_NEQ);
+		else if ('i' == word[0] && 'f' == word[1])
+			symbola(p, TERMSYM_INF);
+		else if ('n' == word[0] && 'a' == word[1])
+			symbola(p, TERMSYM_NAN);
+		else if ('b' == word[0] && 'a' == word[1])
+			symbola(p, TERMSYM_BAR);
+
+		/* Deprecated forms. */
+		else if ('A' == word[0] && 'm' == word[1])
+			symbola(p, TERMSYM_AMP);
+		else if ('B' == word[0] && 'a' == word[1])
+			symbola(p, TERMSYM_BAR);
+		else if ('I' == word[0] && 'f' == word[1])
+			symbola(p, TERMSYM_INF2);
+		else if ('G' == word[0] && 'e' == word[1])
+			symbola(p, TERMSYM_GE);
+		else if ('G' == word[0] && 't' == word[1])
+			symbola(p, TERMSYM_GT);
+		else if ('L' == word[0] && 'e' == word[1])
+			symbola(p, TERMSYM_LE);
+		else if ('L' == word[0] && 'q' == word[1])
+			symbola(p, TERMSYM_LDQUOTE);
+		else if ('L' == word[0] && 't' == word[1])
+			symbola(p, TERMSYM_LT);
+		else if ('N' == word[0] && 'a' == word[1])
+			symbola(p, TERMSYM_NAN);
+		else if ('N' == word[0] && 'e' == word[1])
+			symbola(p, TERMSYM_NEQ);
+		else if ('P' == word[0] && 'i' == word[1])
+			symbola(p, TERMSYM_PI);
+		else if ('P' == word[0] && 'm' == word[1])
+			symbola(p, TERMSYM_PLUSMINUS);
+		else if ('R' == word[0] && 'q' == word[1])
+			symbola(p, TERMSYM_RDQUOTE);
+		else
+			warnx("escape sequence not supported: %c%c",
+					word[0], word[1]);
+		break;
+
+	default:
+		warnx("escape sequence not supported");
+		break;
+	}
+}
+
+
+/*
+ * Apply a style to the output buffer.  This is looked up by means of
+ * the styletab.
+ */
+static void
+style(struct termp *p, enum tstyle esc)
+{
+
+	if (p->col + 4 >= p->maxcols)
+		errx(1, "line overrun");
+
+	p->buf[(p->col)++] = 27;
+	p->buf[(p->col)++] = '[';
+	switch (esc) {
+	case (TERMSTYLE_CLEAR):
+		p->buf[(p->col)++] = '0';
+		break;
+	case (TERMSTYLE_BOLD):
+		p->buf[(p->col)++] = '1';
+		break;
+	case (TERMSTYLE_UNDER):
+		p->buf[(p->col)++] = '4';
+		break;
+	default:
+		abort();
+		/* NOTREACHED */
+	}
+	p->buf[(p->col)++] = 'm';
+}
+
+
+/*
+ * Handle an escape sequence: determine its length and pass it to the
+ * escape-symbol look table.  Note that we assume mdoc(3) has validated
+ * the escape sequence (we assert upon badly-formed escape sequences).
+ */
+static void
+pescape(struct termp *p, const char *word, size_t *i, size_t len)
+{
+	size_t		 j;
+
+	(*i)++;
+	assert(*i < len);
+
+	if ('(' == word[*i]) {
+		(*i)++;
+		assert(*i + 1 < len);
+		nescape(p, &word[*i], 2);
+		(*i)++;
+		return;
+
+	} else if ('*' == word[*i]) { 
+		/* XXX - deprecated! */
+		(*i)++;
+		assert(*i < len);
+		switch (word[*i]) {
+		case ('('):
+			(*i)++;
+			assert(*i + 1 < len);
+			nescape(p, &word[*i], 2);
+			(*i)++;
+			return;
+		case ('['):
+			break;
+		default:
+			nescape(p, &word[*i], 1);
+			return;
+		}
+
+	} else if ('[' != word[*i]) {
+		nescape(p, &word[*i], 1);
+		return;
+	}
+
+	(*i)++;
+	for (j = 0; word[*i] && ']' != word[*i]; (*i)++, j++)
+		/* Loop... */ ;
+
+	assert(word[*i]);
+	nescape(p, &word[*i - j], j);
+}
+
+
+/*
+ * Handle pwords, partial words, which may be either a single word or a
+ * phrase that cannot be broken down (such as a literal string).  This
+ * handles word styling.
+ */
+static void
+pword(struct termp *p, const char *word, size_t len)
+{
+	size_t		 i;
+
+	if ( ! (TERMP_NOSPACE & p->flags) && 
+			! (TERMP_LITERAL & p->flags))
+		chara(p, ' ');
+
+	if ( ! (p->flags & TERMP_NONOSPACE))
+		p->flags &= ~TERMP_NOSPACE;
+
+	/* 
+	 * XXX - if literal and underlining, this will underline the
+	 * spaces between literal words. 
+	 */
+
+	if (p->flags & TERMP_BOLD)
+		style(p, TERMSTYLE_BOLD);
+	if (p->flags & TERMP_UNDERLINE)
+		style(p, TERMSTYLE_UNDER);
+
+	for (i = 0; i < len; i++) {
+		if ('\\' == word[i]) {
+			pescape(p, word, &i, len);
+			continue;
+		}
+		chara(p, word[i]);
+	}
+
+	if (p->flags & TERMP_BOLD ||
+			p->flags & TERMP_UNDERLINE)
+		style(p, TERMSTYLE_CLEAR);
+}
+
+
+/*
+ * Add a symbol to the output line buffer.
+ */
+static void
+symbola(struct termp *p, enum tsym sym)
+{
+
+	assert(p->symtab[sym].sym);
+	stringa(p, p->symtab[sym].sym, p->symtab[sym].sz);
+}
+
+
+/*
+ * Like chara() but for arbitrary-length buffers.  Resize the buffer by
+ * a factor of two (if the buffer is less than that) or the buffer's
+ * size.
+ */
+static void
+stringa(struct termp *p, const char *c, size_t sz)
+{
+	size_t		 s;
+
+	s = sz > p->maxcols * 2 ? sz : p->maxcols * 2;
+	
+	assert(c);
+	if (p->col + sz >= p->maxcols) {
+		p->buf = realloc(p->buf, s);
+		if (NULL == p->buf)
+			err(1, "realloc");
+		p->maxcols = s;
+	}
+
+	(void)memcpy(&p->buf[p->col], c, sz);
+	p->col += sz;
+}
+
+
+/*
+ * Insert a single character into the line-buffer.  If the buffer's
+ * space is exceeded, then allocate more space by doubling the buffer
+ * size.
+ */
+static void
+chara(struct termp *p, char c)
+{
+
+	if (p->col + 1 >= p->maxcols) {
+		p->buf = realloc(p->buf, p->maxcols * 2);
+		if (NULL == p->buf)
+			err(1, "malloc");
+		p->maxcols *= 2;
+	}
+	p->buf[(p->col)++] = c;
+}