Fix the implementation and documentation of \c (continue text input line).

In particular, make it work in no-fill mode, too.
Reminded by Carsten dot Kunze at arcor dot de (Heirloom roff).

10 files changed, 21 insertions, 25 deletions

diff --git a/TODO b/TODO
index 2146ccc1..1dae507b 100644
--- a/TODO
+++ b/TODO
@@ -83,11 +83,6 @@ are mere guesses, and some may be wrong.
   found by jca@ in ratpoison(1)  Sun, 30 Jun 2013 12:01:09 +0200
   loc *  exist **  algo **  size **  imp **
 
-- \c (interrupted text) should prevent the line break
-  even inside .Bd literal; that occurs in chat(8)
-  also found in cclive(1) - DocBook output
-  loc **  exist ***  algo **  size *  imp *
-
 - \h horizontal move
   found in cclive(1) DocBook output
   Anthony J. Bentley on discuss@  Sat, 21 Sep 2013 22:29:34 -0600
diff --git a/html.c b/html.c
index e3d66cc7..7368c841 100644
--- a/html.c
+++ b/html.c
@@ -562,8 +562,9 @@ print_text(struct html *h, const char *word)
 	if ( ! print_encode(h, word, 0)) {
 		if ( ! (h->flags & HTML_NONOSPACE))
 			h->flags &= ~HTML_NOSPACE;
+		h->flags &= ~HTML_NONEWLINE;
 	} else
-		h->flags |= HTML_NOSPACE;
+		h->flags |= HTML_NOSPACE | HTML_NONEWLINE;
 
 	if (h->metaf) {
 		print_tagq(h, h->metaf);
diff --git a/html.h b/html.h
index fd5e0bce..9c790fe5 100644
--- a/html.h
+++ b/html.h
@@ -126,6 +126,7 @@ struct	html {
 #define	HTML_SKIPCHAR	 (1 << 6) /* skip the next character */
 #define	HTML_NOSPLIT	 (1 << 7) /* do not break line before .An */
 #define	HTML_SPLIT	 (1 << 8) /* break line before .An */
+#define	HTML_NONEWLINE	 (1 << 9) /* No line break in nofill mode. */
 	struct tagq	  tags; /* stack of open tags */
 	struct rofftbl	  tbl; /* current table */
 	struct tag	 *tblt; /* current open table scope */
diff --git a/man_html.c b/man_html.c
index 43a77e82..75517854 100644
--- a/man_html.c
+++ b/man_html.c
@@ -212,21 +212,14 @@ print_man_node(MAN_ARGS)
 		man_root_pre(man, n, mh, h);
 		break;
 	case MAN_TEXT:
-		/*
-		 * If we have a blank line, output a vertical space.
-		 * If we have a space as the first character, break
-		 * before printing the line's data.
-		 */
 		if ('\0' == *n->string) {
 			print_paragraph(h);
 			return;
 		}
-
-		if (' ' == *n->string && MAN_LINE & n->flags)
+		if (n->flags & MAN_LINE && (*n->string == ' ' || 
+		    (n->prev != NULL && mh->fl & MANH_LITERAL &&
+		     ! (h->flags & HTML_NONEWLINE))))
 			print_otag(h, TAG_BR, 0, NULL);
-		else if (MANH_LITERAL & mh->fl && n->prev)
-			print_otag(h, TAG_BR, 0, NULL);
-
 		print_text(h, n->string);
 		return;
 	case MAN_EQN:
diff --git a/man_term.c b/man_term.c
index 1740c944..d6108cbb 100644
--- a/man_term.c
+++ b/man_term.c
@@ -1018,13 +1018,14 @@ out:
 	 * -man doesn't have nested macros, we don't need to be
 	 * more specific than this.
 	 */
-	if (MANT_LITERAL & mt->fl && ! (TERMP_NOBREAK & p->flags) &&
-	    (NULL == n->next || MAN_LINE & n->next->flags)) {
+	if (mt->fl & MANT_LITERAL &&
+	    ! (p->flags & (TERMP_NOBREAK | TERMP_NONEWLINE)) &&
+	    (n->next == NULL || n->next->flags & MAN_LINE)) {
 		rm = p->rmargin;
 		rmax = p->maxrmargin;
 		p->rmargin = p->maxrmargin = TERM_MAXMARGIN;
 		p->flags |= TERMP_NOSPACE;
-		if (NULL != n->string && '\0' != *n->string)
+		if (n->string != NULL && *n->string != '\0')
 			term_flushln(p);
 		else
 			term_newln(p);
diff --git a/mdoc_html.c b/mdoc_html.c
index 5ef6dcc3..305ad499 100644
--- a/mdoc_html.c
+++ b/mdoc_html.c
@@ -1201,7 +1201,8 @@ mdoc_bd_pre(MDOC_ARGS)
 		default:
 			break;
 		}
-		if (nn->next && nn->next->line == nn->line)
+		if (h->flags & HTML_NONEWLINE ||
+		    (nn->next && ! (nn->next->flags & MDOC_LINE)))
 			continue;
 		else if (nn->next)
 			print_text(h, "\n");
diff --git a/mdoc_term.c b/mdoc_term.c
index 4b4d12d9..e940ab9d 100644
--- a/mdoc_term.c
+++ b/mdoc_term.c
@@ -1632,7 +1632,8 @@ termp_bd_pre(DECL_ARGS)
 		default:
 			break;
 		}
-		if (nn->next && nn->next->line == nn->line)
+		if (p->flags & TERMP_NONEWLINE ||
+		    (nn->next && ! (nn->next->flags & MDOC_LINE)))
 			continue;
 		term_flushln(p);
 		p->flags |= TERMP_NOSPACE;
diff --git a/roff.7 b/roff.7
index 6998a133..15f74e30 100644
--- a/roff.7
+++ b/roff.7
@@ -1196,8 +1196,10 @@ Bracket building function; ignored by
 .Sx Special Characters
 with names of arbitrary length.
 .Ss \ec
-Interrupt text processing to insert requests or macros; ignored by
-.Xr mandoc 1 .
+When encountered at the end of an input text line,
+the next input text line is considered to continue that line,
+even if there are request or macro lines in between.
+No whitespace is inserted.
 .Ss \eD\(aq Ns Ar string Ns \(aq
 Draw graphics function; ignored by
 .Xr mandoc 1 .
diff --git a/term.c b/term.c
index f45c96b8..2728d356 100644
--- a/term.c
+++ b/term.c
@@ -417,7 +417,7 @@ term_word(struct termp *p, const char *word)
 	else
 		p->flags |= TERMP_NOSPACE;
 
-	p->flags &= ~TERMP_SENTENCE;
+	p->flags &= ~(TERMP_SENTENCE | TERMP_NONEWLINE);
 
 	while ('\0' != *word) {
 		if ('\\' != *word) {
@@ -487,7 +487,7 @@ term_word(struct termp *p, const char *word)
 			if (TERMP_SKIPCHAR & p->flags)
 				p->flags &= ~TERMP_SKIPCHAR;
 			else if ('\0' == *word)
-				p->flags |= TERMP_NOSPACE;
+				p->flags |= (TERMP_NOSPACE | TERMP_NONEWLINE);
 			continue;
 		case ESCAPE_SKIPCHAR:
 			p->flags |= TERMP_SKIPCHAR;
diff --git a/term.h b/term.h
index 8d86d87a..bb3e0574 100644
--- a/term.h
+++ b/term.h
@@ -79,6 +79,7 @@ struct	termp {
 #define	TERMP_HANG	 (1 << 11)	/* See term_flushln(). */
 #define	TERMP_NOSPLIT	 (1 << 12)	/* Do not break line before .An. */
 #define	TERMP_SPLIT	 (1 << 13)	/* Break line before .An. */
+#define	TERMP_NONEWLINE	 (1 << 14)	/* No line break in nofill mode. */
 	int		 *buf;		/* Output buffer. */
 	enum termenc	  enc;		/* Type of encoding. */
 	const struct mchars *symtab;	/* Character table. */