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Date: Fri, 24 Aug 2018 18:13:07 -0500 (EST)
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From: schwarze@mandoc.bsd.lv
To: source@mandoc.bsd.lv
Subject: mandoc: Rudimentary implementation of the roff(7) .while request.
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Log Message:
-----------
Rudimentary implementation of the roff(7) .while request.
Needed for example by groff_hdtbl(7).

There are two limitations:
It does not support nested .while requests yet,
and each .while loop must start and end in the same scope.

The roff_parseln() return codes are now more flexible 
and allow OR'ing options.

Modified Files:
--------------
    mandoc:
        TODO
        libmandoc.h
        mandoc.h
        mandoc_headers.3
        read.c
        roff.7
        roff.c
        tbl.3
    mandoc/regress/roff:
        Makefile

Added Files:
-----------
    mandoc/regress/roff/while:
        Makefile
        badargs.in
        badargs.out_ascii
        badargs.out_lint
        basic.in
        basic.out_ascii
        into.in
        into.out_ascii
        into.out_lint
        nesting.in
        nesting.out_ascii
        nesting.out_lint
        outof.in
        outof.out_ascii
        outof.out_lint

Revision Data
-------------
Index: read.c
===================================================================
RCS file: /home/cvs/mandoc/mandoc/read.c,v
retrieving revision 1.198
retrieving revision 1.199
diff -Lread.c -Lread.c -u -p -r1.198 -r1.199
--- read.c
+++ read.c
@@ -49,6 +49,7 @@ struct	mparse {
 	const char	 *file; /* filename of current input file */
 	struct buf	 *primary; /* buffer currently being parsed */
 	struct buf	 *secondary; /* copy of top level input */
+	struct buf	 *loop; /* open .while request line */
 	const char	 *os_s; /* default operating system */
 	mandocmsg	  mmsg; /* warning/error message handler */
 	enum mandoclevel  file_status; /* status of current parse */
@@ -63,7 +64,7 @@ struct	mparse {
 static	void	  choose_parser(struct mparse *);
 static	void	  free_buf_list(struct buf *);
 static	void	  resize_buf(struct buf *, size_t);
-static	enum rofferr mparse_buf_r(struct mparse *, struct buf, size_t, int);
+static	int	  mparse_buf_r(struct mparse *, struct buf, size_t, int);
 static	int	  read_whole_file(struct mparse *, const char *, int,
 				struct buf *, int *);
 static	void	  mparse_end(struct mparse *);
@@ -266,6 +267,10 @@ static	const char * const	mandocerrs[MAN
 	"input too large",
 	"unsupported control character",
 	"unsupported roff request",
+	"nested .while loops",
+	"end of scope with open .while loop",
+	"end of .while loop in inner scope",
+	"cannot continue this .while loop",
 	"eqn delim option in tbl",
 	"unsupported tbl layout modifier",
 	"ignoring macro in table",
@@ -356,32 +361,31 @@ choose_parser(struct mparse *curp)
  * macros, inline equations, and input line traps)
  * and indirectly (for .so file inclusion).
  */
-static enum rofferr
+static int
 mparse_buf_r(struct mparse *curp, struct buf blk, size_t i, int start)
 {
 	struct buf	 ln;
-	struct buf	*firstln, *lastln, *thisln;
+	struct buf	*firstln, *lastln, *thisln, *loop;
 	const char	*save_file;
 	char		*cp;
 	size_t		 pos; /* byte number in the ln buffer */
-	enum rofferr	 line_result, result;
+	int		 line_result, result;
 	int		 of;
 	int		 lnn; /* line number in the real file */
 	int		 fd;
+	int		 inloop; /* Saw .while on this level. */
 	unsigned char	 c;
 
 	ln.sz = 256;
 	ln.buf = mandoc_malloc(ln.sz);
 	ln.next = NULL;
-	firstln = NULL;
+	firstln = loop = NULL;
 	lnn = curp->line;
 	pos = 0;
+	inloop = 0;
 	result = ROFF_CONT;
 
-	while (i < blk.sz) {
-		if (0 == pos && '\0' == blk.buf[i])
-			break;
-
+	while (i < blk.sz && (blk.buf[i] != '\0' || pos != 0)) {
 		if (start) {
 			curp->line = lnn;
 			curp->reparse_count = 0;
@@ -490,41 +494,95 @@ mparse_buf_r(struct mparse *curp, struct
 rerun:
 		line_result = roff_parseln(curp->roff, curp->line, &ln, &of);
 
-		switch (line_result) {
+		/* Process options. */
+
+		if (line_result & ROFF_APPEND)
+			assert(line_result == (ROFF_IGN | ROFF_APPEND));
+
+		if (line_result & ROFF_USERCALL)
+			assert((line_result & ROFF_MASK) == ROFF_REPARSE);
+
+		if (line_result & ROFF_USERRET) {
+			assert(line_result == (ROFF_IGN | ROFF_USERRET));
+			if (start == 0) {
+				/* Return from the current macro. */
+				result = ROFF_USERRET;
+				goto out;
+			}
+		}
+
+		switch (line_result & ROFF_LOOPMASK) {
+		case ROFF_IGN:
+			break;
+		case ROFF_WHILE:
+			if (curp->loop != NULL) {
+				if (loop == curp->loop)
+					break;
+				mandoc_msg(MANDOCERR_WHILE_NEST,
+				    curp, curp->line, pos, NULL);
+			}
+			curp->loop = thisln;
+			loop = NULL;
+			inloop = 1;
+			break;
+		case ROFF_LOOPCONT:
+		case ROFF_LOOPEXIT:
+			if (curp->loop == NULL) {
+				mandoc_msg(MANDOCERR_WHILE_FAIL,
+				    curp, curp->line, pos, NULL);
+				break;
+			}
+			if (inloop == 0) {
+				mandoc_msg(MANDOCERR_WHILE_INTO,
+				    curp, curp->line, pos, NULL);
+				curp->loop = loop = NULL;
+				break;
+			}
+			if (line_result & ROFF_LOOPCONT)
+				loop = curp->loop;
+			else {
+				curp->loop = loop = NULL;
+				inloop = 0;
+			}
+			break;
+		default:
+			abort();
+		}
+
+		/* Process the main instruction from the roff parser. */
+
+		switch (line_result & ROFF_MASK) {
+		case ROFF_IGN:
+			break;
+		case ROFF_CONT:
+			if (curp->man->macroset == MACROSET_NONE)
+				choose_parser(curp);
+			if ((curp->man->macroset == MACROSET_MDOC ?
+			     mdoc_parseln(curp->man, curp->line, ln.buf, of) :
+			     man_parseln(curp->man, curp->line, ln.buf, of)
+			    ) == 2)
+				goto out;
+			break;
+		case ROFF_RERUN:
+			goto rerun;
 		case ROFF_REPARSE:
-		case ROFF_USERCALL:
 			if (++curp->reparse_count > REPARSE_LIMIT) {
+				/* Abort and return to the top level. */
 				result = ROFF_IGN;
 				mandoc_msg(MANDOCERR_ROFFLOOP, curp,
 				    curp->line, pos, NULL);
-			} else {
-				result = mparse_buf_r(curp, ln, of, 0);
-				if (line_result == ROFF_USERCALL) {
-					if (result == ROFF_USERRET)
-						result = ROFF_CONT;
-					roff_userret(curp->roff);
-				}
-				if (start || result == ROFF_CONT) {
-					pos = 0;
-					continue;
-				}
+				goto out;
 			}
-			goto out;
-		case ROFF_USERRET:
-			if (start) {
-				pos = 0;
-				continue;
+			result = mparse_buf_r(curp, ln, of, 0);
+			if (line_result & ROFF_USERCALL) {
+				roff_userret(curp->roff);
+				/* Continue normally. */
+				if (result & ROFF_USERRET)
+					result = ROFF_CONT;
 			}
-			result = ROFF_USERRET;
-			goto out;
-		case ROFF_APPEND:
-			pos = strlen(ln.buf);
-			continue;
-		case ROFF_RERUN:
-			goto rerun;
-		case ROFF_IGN:
-			pos = 0;
-			continue;
+			if (start == 0 && result != ROFF_CONT)
+				goto out;
+			break;
 		case ROFF_SO:
 			if ( ! (curp->options & MPARSE_SO) &&
 			    (i >= blk.sz || blk.buf[i] == '\0')) {
@@ -549,30 +607,36 @@ rerun:
 				of = 0;
 				mparse_buf_r(curp, ln, of, 0);
 			}
-			pos = 0;
-			continue;
-		default:
 			break;
+		default:
+			abort();
 		}
 
-		if (curp->man->macroset == MACROSET_NONE)
-			choose_parser(curp);
-
-		if ((curp->man->macroset == MACROSET_MDOC ?
-		    mdoc_parseln(curp->man, curp->line, ln.buf, of) :
-		    man_parseln(curp->man, curp->line, ln.buf, of)) == 2)
-				break;
-
-		/* Temporary buffers typically are not full. */
-
-		if (0 == start && '\0' == blk.buf[i])
-			break;
-
 		/* Start the next input line. */
 
-		pos = 0;
+		if (loop != NULL &&
+		    (line_result & ROFF_LOOPMASK) == ROFF_IGN)
+			loop = loop->next;
+
+		if (loop != NULL) {
+			if ((line_result & ROFF_APPEND) == 0)
+				*ln.buf = '\0';
+			if (ln.sz < loop->sz)
+				resize_buf(&ln, loop->sz);
+			(void)strlcat(ln.buf, loop->buf, ln.sz);
+			of = 0;
+			goto rerun;
+		}
+
+		pos = (line_result & ROFF_APPEND) ? strlen(ln.buf) : 0;
 	}
 out:
+	if (inloop) {
+		if (result != ROFF_USERRET)
+			mandoc_msg(MANDOCERR_WHILE_OUTOF, curp,
+			    curp->line, pos, NULL);
+		curp->loop = NULL;
+	}
 	free(ln.buf);
 	if (firstln != curp->secondary)
 		free_buf_list(firstln);
Index: roff.c
===================================================================
RCS file: /home/cvs/mandoc/mandoc/roff.c,v
retrieving revision 1.339
retrieving revision 1.340
diff -Lroff.c -Lroff.c -u -p -r1.339 -r1.340
--- roff.c
+++ roff.c
@@ -143,7 +143,7 @@ struct	roffnode {
 			 int pos, /* current pos in buffer */ \
 			 int *offs /* reset offset of buffer data */
 
-typedef	enum rofferr (*roffproc)(ROFF_ARGS);
+typedef	int (*roffproc)(ROFF_ARGS);
 
 struct	roffmac {
 	roffproc	 proc; /* process new macro */
@@ -163,26 +163,26 @@ struct	predef {
 
 /* --- function prototypes ------------------------------------------------ */
 
-static	void		 roffnode_cleanscope(struct roff *);
-static	void		 roffnode_pop(struct roff *);
+static	int		 roffnode_cleanscope(struct roff *);
+static	int		 roffnode_pop(struct roff *);
 static	void		 roffnode_push(struct roff *, enum roff_tok,
 				const char *, int, int);
 static	void		 roff_addtbl(struct roff_man *, struct tbl_node *);
-static	enum rofferr	 roff_als(ROFF_ARGS);
-static	enum rofferr	 roff_block(ROFF_ARGS);
-static	enum rofferr	 roff_block_text(ROFF_ARGS);
-static	enum rofferr	 roff_block_sub(ROFF_ARGS);
-static	enum rofferr	 roff_br(ROFF_ARGS);
-static	enum rofferr	 roff_cblock(ROFF_ARGS);
-static	enum rofferr	 roff_cc(ROFF_ARGS);
-static	void		 roff_ccond(struct roff *, int, int);
-static	enum rofferr	 roff_cond(ROFF_ARGS);
-static	enum rofferr	 roff_cond_text(ROFF_ARGS);
-static	enum rofferr	 roff_cond_sub(ROFF_ARGS);
-static	enum rofferr	 roff_ds(ROFF_ARGS);
-static	enum rofferr	 roff_ec(ROFF_ARGS);
-static	enum rofferr	 roff_eo(ROFF_ARGS);
-static	enum rofferr	 roff_eqndelim(struct roff *, struct buf *, int);
+static	int		 roff_als(ROFF_ARGS);
+static	int		 roff_block(ROFF_ARGS);
+static	int		 roff_block_text(ROFF_ARGS);
+static	int		 roff_block_sub(ROFF_ARGS);
+static	int		 roff_br(ROFF_ARGS);
+static	int		 roff_cblock(ROFF_ARGS);
+static	int		 roff_cc(ROFF_ARGS);
+static	int		 roff_ccond(struct roff *, int, int);
+static	int		 roff_cond(ROFF_ARGS);
+static	int		 roff_cond_text(ROFF_ARGS);
+static	int		 roff_cond_sub(ROFF_ARGS);
+static	int		 roff_ds(ROFF_ARGS);
+static	int		 roff_ec(ROFF_ARGS);
+static	int		 roff_eo(ROFF_ARGS);
+static	int		 roff_eqndelim(struct roff *, struct buf *, int);
 static	int		 roff_evalcond(struct roff *r, int, char *, int *);
 static	int		 roff_evalnum(struct roff *, int,
 				const char *, int *, int *, int);
@@ -203,42 +203,42 @@ static	const char	*roff_getstrn(struct r
 				const char *, size_t, int *);
 static	int		 roff_hasregn(const struct roff *,
 				const char *, size_t);
-static	enum rofferr	 roff_insec(ROFF_ARGS);
-static	enum rofferr	 roff_it(ROFF_ARGS);
-static	enum rofferr	 roff_line_ignore(ROFF_ARGS);
+static	int		 roff_insec(ROFF_ARGS);
+static	int		 roff_it(ROFF_ARGS);
+static	int		 roff_line_ignore(ROFF_ARGS);
 static	void		 roff_man_alloc1(struct roff_man *);
 static	void		 roff_man_free1(struct roff_man *);
-static	enum rofferr	 roff_manyarg(ROFF_ARGS);
-static	enum rofferr	 roff_nop(ROFF_ARGS);
-static	enum rofferr	 roff_nr(ROFF_ARGS);
-static	enum rofferr	 roff_onearg(ROFF_ARGS);
+static	int		 roff_manyarg(ROFF_ARGS);
+static	int		 roff_nop(ROFF_ARGS);
+static	int		 roff_nr(ROFF_ARGS);
+static	int		 roff_onearg(ROFF_ARGS);
 static	enum roff_tok	 roff_parse(struct roff *, char *, int *,
 				int, int);
-static	enum rofferr	 roff_parsetext(struct roff *, struct buf *,
+static	int		 roff_parsetext(struct roff *, struct buf *,
 				int, int *);
-static	enum rofferr	 roff_renamed(ROFF_ARGS);
-static	enum rofferr	 roff_res(struct roff *, struct buf *, int, int);
-static	enum rofferr	 roff_return(ROFF_ARGS);
-static	enum rofferr	 roff_rm(ROFF_ARGS);
-static	enum rofferr	 roff_rn(ROFF_ARGS);
-static	enum rofferr	 roff_rr(ROFF_ARGS);
+static	int		 roff_renamed(ROFF_ARGS);
+static	int		 roff_res(struct roff *, struct buf *, int, int);
+static	int		 roff_return(ROFF_ARGS);
+static	int		 roff_rm(ROFF_ARGS);
+static	int		 roff_rn(ROFF_ARGS);
+static	int		 roff_rr(ROFF_ARGS);
 static	void		 roff_setregn(struct roff *, const char *,
 				size_t, int, char, int);
 static	void		 roff_setstr(struct roff *,
 				const char *, const char *, int);
 static	void		 roff_setstrn(struct roffkv **, const char *,
 				size_t, const char *, size_t, int);
-static	enum rofferr	 roff_shift(ROFF_ARGS);
-static	enum rofferr	 roff_so(ROFF_ARGS);
-static	enum rofferr	 roff_tr(ROFF_ARGS);
-static	enum rofferr	 roff_Dd(ROFF_ARGS);
-static	enum rofferr	 roff_TE(ROFF_ARGS);
-static	enum rofferr	 roff_TS(ROFF_ARGS);
-static	enum rofferr	 roff_EQ(ROFF_ARGS);
-static	enum rofferr	 roff_EN(ROFF_ARGS);
-static	enum rofferr	 roff_T_(ROFF_ARGS);
-static	enum rofferr	 roff_unsupp(ROFF_ARGS);
-static	enum rofferr	 roff_userdef(ROFF_ARGS);
+static	int		 roff_shift(ROFF_ARGS);
+static	int		 roff_so(ROFF_ARGS);
+static	int		 roff_tr(ROFF_ARGS);
+static	int		 roff_Dd(ROFF_ARGS);
+static	int		 roff_TE(ROFF_ARGS);
+static	int		 roff_TS(ROFF_ARGS);
+static	int		 roff_EQ(ROFF_ARGS);
+static	int		 roff_EN(ROFF_ARGS);
+static	int		 roff_T_(ROFF_ARGS);
+static	int		 roff_unsupp(ROFF_ARGS);
+static	int		 roff_userdef(ROFF_ARGS);
 
 /* --- constant data ------------------------------------------------------ */
 
@@ -590,7 +590,7 @@ static	struct roffmac	 roffs[TOKEN_NONE]
 	{ roff_line_ignore, NULL, NULL, 0 },  /* watchlength */
 	{ roff_line_ignore, NULL, NULL, 0 },  /* watchn */
 	{ roff_unsupp, NULL, NULL, 0 },  /* wh */
-	{ roff_unsupp, NULL, NULL, 0 },  /* while */
+	{ roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT }, /*while*/
 	{ roff_insec, NULL, NULL, 0 },  /* write */
 	{ roff_insec, NULL, NULL, 0 },  /* writec */
 	{ roff_insec, NULL, NULL, 0 },  /* writem */
@@ -674,18 +674,19 @@ roffhash_find(struct ohash *htab, const 
  * Pop the current node off of the stack of roff instructions currently
  * pending.
  */
-static void
+static int
 roffnode_pop(struct roff *r)
 {
 	struct roffnode	*p;
+	int		 inloop;
 
-	assert(r->last);
 	p = r->last;
-
-	r->last = r->last->parent;
+	inloop = p->tok == ROFF_while;
+	r->last = p->parent;
 	free(p->name);
 	free(p->end);
 	free(p);
+	return inloop;
 }
 
 /*
@@ -1144,7 +1145,7 @@ deroff(char **dest, const struct roff_no
  * used in numerical expressions and conditional requests.
  * Also check the syntax of the remaining escape sequences.
  */
-static enum rofferr
+static int
 roff_res(struct roff *r, struct buf *buf, int ln, int pos)
 {
 	struct mctx	*ctx;	/* current macro call context */
@@ -1236,7 +1237,7 @@ roff_res(struct roff *r, struct buf *buf
 
 		if (stesc[1] == '#') {
 			*stesc = '\0';
-			return ROFF_APPEND;
+			return ROFF_IGN | ROFF_APPEND;
 		}
 
 		/* Discard normal comments. */
@@ -1294,7 +1295,7 @@ roff_res(struct roff *r, struct buf *buf
 			if (done)
 				continue;
 			else
-				return ROFF_APPEND;
+				return ROFF_IGN | ROFF_APPEND;
 		}
 
 		/* Decide whether to expand or to check only. */
@@ -1529,7 +1530,7 @@ roff_res(struct roff *r, struct buf *buf
 /*
  * Process text streams.
  */
-static enum rofferr
+static int
 roff_parsetext(struct roff *r, struct buf *buf, int pos, int *offs)
 {
 	size_t		 sz;
@@ -1595,11 +1596,11 @@ roff_parsetext(struct roff *r, struct bu
 	return ROFF_CONT;
 }
 
-enum rofferr
+int
 roff_parseln(struct roff *r, int ln, struct buf *buf, int *offs)
 {
 	enum roff_tok	 t;
-	enum rofferr	 e;
+	int		 e;
 	int		 pos;	/* parse point */
 	int		 spos;	/* saved parse point for messages */
 	int		 ppos;	/* original offset in buf->buf */
@@ -1621,7 +1622,7 @@ roff_parseln(struct roff *r, int ln, str
 	/* Expand some escape sequences. */
 
 	e = roff_res(r, buf, ln, pos);
-	if (e == ROFF_IGN || e == ROFF_APPEND)
+	if ((e & ROFF_MASK) == ROFF_IGN)
 		return e;
 	assert(e == ROFF_CONT);
 
@@ -1638,21 +1639,22 @@ roff_parseln(struct roff *r, int ln, str
 	if (r->last != NULL && ! ctl) {
 		t = r->last->tok;
 		e = (*roffs[t].text)(r, t, buf, ln, pos, pos, offs);
-		if (e == ROFF_IGN)
+		if ((e & ROFF_MASK) == ROFF_IGN)
 			return e;
-		assert(e == ROFF_CONT);
-	}
+		e &= ~ROFF_MASK;
+	} else
+		e = ROFF_IGN;
 	if (r->eqn != NULL && strncmp(buf->buf + ppos, ".EN", 3)) {
 		eqn_read(r->eqn, buf->buf + ppos);
-		return ROFF_IGN;
+		return e;
 	}
 	if (r->tbl != NULL && (ctl == 0 || buf->buf[pos] == '\0')) {
 		tbl_read(r->tbl, ln, buf->buf, ppos);
 		roff_addtbl(r->man, r->tbl);
-		return ROFF_IGN;
+		return e;
 	}
 	if ( ! ctl)
-		return roff_parsetext(r, buf, pos, offs);
+		return roff_parsetext(r, buf, pos, offs) | e;
 
 	/* Skip empty request lines. */
 
@@ -1808,7 +1810,7 @@ roff_parse(struct roff *r, char *buf, in
 
 /* --- handling of request blocks ----------------------------------------- */
 
-static enum rofferr
+static int
 roff_cblock(ROFF_ARGS)
 {
 
@@ -1848,50 +1850,51 @@ roff_cblock(ROFF_ARGS)
 
 }
 
-static void
+static int
 roffnode_cleanscope(struct roff *r)
 {
+	int inloop;
 
-	while (r->last) {
+	inloop = 0;
+	while (r->last != NULL) {
 		if (--r->last->endspan != 0)
 			break;
-		roffnode_pop(r);
+		inloop += roffnode_pop(r);
 	}
+	return inloop;
 }
 
-static void
+static int
 roff_ccond(struct roff *r, int ln, int ppos)
 {
-
 	if (NULL == r->last) {
 		mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
 		    ln, ppos, "\\}");
-		return;
+		return 0;
 	}
 
 	switch (r->last->tok) {
 	case ROFF_el:
 	case ROFF_ie:
 	case ROFF_if:
+	case ROFF_while:
 		break;
 	default:
 		mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
 		    ln, ppos, "\\}");
-		return;
+		return 0;
 	}
 
 	if (r->last->endspan > -1) {
 		mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
 		    ln, ppos, "\\}");
-		return;
+		return 0;
 	}
 
-	roffnode_pop(r);
-	roffnode_cleanscope(r);
-	return;
+	return roffnode_pop(r) + roffnode_cleanscope(r);
 }
 
-static enum rofferr
+static int
 roff_block(ROFF_ARGS)
 {
 	const char	*name, *value;
@@ -2016,7 +2019,7 @@ roff_block(ROFF_ARGS)
 	return ROFF_IGN;
 }
 
-static enum rofferr
+static int
 roff_block_sub(ROFF_ARGS)
 {
 	enum roff_tok	t;
@@ -2070,7 +2073,7 @@ roff_block_sub(ROFF_ARGS)
 	return (*roffs[t].proc)(r, t, buf, ln, ppos, pos, offs);
 }
 
-static enum rofferr
+static int
 roff_block_text(ROFF_ARGS)
 {
 
@@ -2080,15 +2083,19 @@ roff_block_text(ROFF_ARGS)
 	return ROFF_IGN;
 }
 
-static enum rofferr
+static int
 roff_cond_sub(ROFF_ARGS)
 {
-	enum roff_tok	 t;
 	char		*ep;
-	int		 rr;
+	int		 endloop, irc, rr;
+	enum roff_tok	 t;
 
+	irc = ROFF_IGN;
 	rr = r->last->rule;
-	roffnode_cleanscope(r);
+	endloop = tok != ROFF_while ? ROFF_IGN :
+	    rr ? ROFF_LOOPCONT : ROFF_LOOPEXIT;
+	if (roffnode_cleanscope(r))
+		irc |= endloop;
 
 	/*
 	 * If `\}' occurs on a macro line without a preceding macro,
@@ -2105,7 +2112,8 @@ roff_cond_sub(ROFF_ARGS)
 		switch (ep[1]) {
 		case '}':
 			memmove(ep, ep + 2, strlen(ep + 2) + 1);
-			roff_ccond(r, ln, ep - buf->buf);
+			if (roff_ccond(r, ln, ep - buf->buf))
+				irc |= endloop;
 			break;
 		case '\0':
 			++ep;
@@ -2122,30 +2130,38 @@ roff_cond_sub(ROFF_ARGS)
 	 */
 
 	t = roff_parse(r, buf->buf, &pos, ln, ppos);
-	return t != TOKEN_NONE && (rr || roffs[t].flags & ROFFMAC_STRUCT)
-	    ? (*roffs[t].proc)(r, t, buf, ln, ppos, pos, offs) : rr
-	    ? ROFF_CONT : ROFF_IGN;
+	irc |= t != TOKEN_NONE && (rr || roffs[t].flags & ROFFMAC_STRUCT) ?
+	    (*roffs[t].proc)(r, t, buf, ln, ppos, pos, offs) :
+	    rr ? ROFF_CONT : ROFF_IGN;
+	return irc;
 }
 
-static enum rofferr
+static int
 roff_cond_text(ROFF_ARGS)
 {
 	char		*ep;
-	int		 rr;
+	int		 endloop, irc, rr;
 
+	irc = ROFF_IGN;
 	rr = r->last->rule;
-	roffnode_cleanscope(r);
+	endloop = tok != ROFF_while ? ROFF_IGN :
+	    rr ? ROFF_LOOPCONT : ROFF_LOOPEXIT;
+	if (roffnode_cleanscope(r))
+		irc |= endloop;
 
 	ep = buf->buf + pos;
 	while ((ep = strchr(ep, '\\')) != NULL) {
 		if (*(++ep) == '}') {
 			*ep = '&';
-			roff_ccond(r, ln, ep - buf->buf - 1);
+			if (roff_ccond(r, ln, ep - buf->buf - 1))
+				irc |= endloop;
 		}
 		if (*ep != '\0')
 			++ep;
 	}
-	return rr ? ROFF_CONT : ROFF_IGN;
+	if (rr)
+		irc |= ROFF_CONT;
+	return irc;
 }
 
 /* --- handling of numeric and conditional expressions -------------------- */
@@ -2365,14 +2381,14 @@ roff_evalcond(struct roff *r, int ln, ch
 		return 0;
 }
 
-static enum rofferr
+static int
 roff_line_ignore(ROFF_ARGS)
 {
 
 	return ROFF_IGN;
 }
 
-static enum rofferr
+static int
 roff_insec(ROFF_ARGS)
 {
 
@@ -2381,7 +2397,7 @@ roff_insec(ROFF_ARGS)
 	return ROFF_IGN;
 }
 
-static enum rofferr
+static int
 roff_unsupp(ROFF_ARGS)
 {
 
@@ -2390,9 +2406,10 @@ roff_unsupp(ROFF_ARGS)
 	return ROFF_IGN;
 }
 
-static enum rofferr
+static int
 roff_cond(ROFF_ARGS)
 {
+	int	 irc;
 
 	roffnode_push(r, tok, NULL, ln, ppos);
 
@@ -2431,9 +2448,10 @@ roff_cond(ROFF_ARGS)
 	 * Determine scope.
 	 * If there is nothing on the line after the conditional,
 	 * not even whitespace, use next-line scope.
+	 * Except that .while does not support next-line scope.
 	 */
 
-	if (buf->buf[pos] == '\0') {
+	if (buf->buf[pos] == '\0' && tok != ROFF_while) {
 		r->last->endspan = 2;
 		goto out;
 	}
@@ -2465,10 +2483,13 @@ roff_cond(ROFF_ARGS)
 
 out:
 	*offs = pos;
-	return ROFF_RERUN;
+	irc = ROFF_RERUN;
+	if (tok == ROFF_while)
+		irc |= ROFF_WHILE;
+	return irc;
 }
 
-static enum rofferr
+static int
 roff_ds(ROFF_ARGS)
 {
 	char		*string;
@@ -2857,7 +2878,7 @@ roff_freereg(struct roffreg *reg)
 	}
 }
 
-static enum rofferr
+static int
 roff_nr(ROFF_ARGS)
 {
 	char		*key, *val, *step;
@@ -2891,7 +2912,7 @@ roff_nr(ROFF_ARGS)
 	return ROFF_IGN;
 }
 
-static enum rofferr
+static int
 roff_rr(ROFF_ARGS)
 {
 	struct roffreg	*reg, **prev;
@@ -2921,7 +2942,7 @@ roff_rr(ROFF_ARGS)
 
 /* --- handler functions for roff requests -------------------------------- */
 
-static enum rofferr
+static int
 roff_rm(ROFF_ARGS)
 {
 	const char	 *name;
@@ -2940,7 +2961,7 @@ roff_rm(ROFF_ARGS)
 	return ROFF_IGN;
 }
 
-static enum rofferr
+static int
 roff_it(ROFF_ARGS)
 {
 	int		 iv;
@@ -2969,7 +2990,7 @@ roff_it(ROFF_ARGS)
 	return ROFF_IGN;
 }
 
-static enum rofferr
+static int
 roff_Dd(ROFF_ARGS)
 {
 	int		 mask;
@@ -2999,7 +3020,7 @@ roff_Dd(ROFF_ARGS)
 	return ROFF_CONT;
 }
 
-static enum rofferr
+static int
 roff_TE(ROFF_ARGS)
 {
 	if (r->tbl == NULL) {
@@ -3019,7 +3040,7 @@ roff_TE(ROFF_ARGS)
 	return ROFF_IGN;
 }
 
-static enum rofferr
+static int
 roff_T_(ROFF_ARGS)
 {
 
@@ -3035,7 +3056,7 @@ roff_T_(ROFF_ARGS)
 /*
  * Handle in-line equation delimiters.
  */
-static enum rofferr
+static int
 roff_eqndelim(struct roff *r, struct buf *buf, int pos)
 {
 	char		*cp1, *cp2;
@@ -3098,7 +3119,7 @@ roff_eqndelim(struct roff *r, struct buf
 	return ROFF_REPARSE;
 }
 
-static enum rofferr
+static int
 roff_EQ(ROFF_ARGS)
 {
 	struct roff_node	*n;
@@ -3128,7 +3149,7 @@ roff_EQ(ROFF_ARGS)
 	return ROFF_IGN;
 }
 
-static enum rofferr
+static int
 roff_EN(ROFF_ARGS)
 {
 	if (r->eqn != NULL) {
@@ -3142,7 +3163,7 @@ roff_EN(ROFF_ARGS)
 	return ROFF_IGN;
 }
 
-static enum rofferr
+static int
 roff_TS(ROFF_ARGS)
 {
 	if (r->tbl != NULL) {
@@ -3159,7 +3180,7 @@ roff_TS(ROFF_ARGS)
 	return ROFF_IGN;
 }
 
-static enum rofferr
+static int
 roff_onearg(ROFF_ARGS)
 {
 	struct roff_node	*n;
@@ -3219,7 +3240,7 @@ roff_onearg(ROFF_ARGS)
 	return ROFF_IGN;
 }
 
-static enum rofferr
+static int
 roff_manyarg(ROFF_ARGS)
 {
 	struct roff_node	*n;
@@ -3242,7 +3263,7 @@ roff_manyarg(ROFF_ARGS)
 	return ROFF_IGN;
 }
 
-static enum rofferr
+static int
 roff_als(ROFF_ARGS)
 {
 	char		*oldn, *newn, *end, *value;
@@ -3269,7 +3290,7 @@ roff_als(ROFF_ARGS)
 	return ROFF_IGN;
 }
 
-static enum rofferr
+static int
 roff_br(ROFF_ARGS)
 {
 	if (r->man->flags & (MAN_BLINE | MAN_ELINE))
@@ -3283,7 +3304,7 @@ roff_br(ROFF_ARGS)
 	return ROFF_IGN;
 }
 
-static enum rofferr
+static int
 roff_cc(ROFF_ARGS)
 {
 	const char	*p;
@@ -3300,7 +3321,7 @@ roff_cc(ROFF_ARGS)
 	return ROFF_IGN;
 }
 
-static enum rofferr
+static int
 roff_ec(ROFF_ARGS)
 {
 	const char	*p;
@@ -3317,7 +3338,7 @@ roff_ec(ROFF_ARGS)
 	return ROFF_IGN;
 }
 
-static enum rofferr
+static int
 roff_eo(ROFF_ARGS)
 {
 	r->escape = '\0';
@@ -3327,7 +3348,7 @@ roff_eo(ROFF_ARGS)
 	return ROFF_IGN;
 }
 
-static enum rofferr
+static int
 roff_nop(ROFF_ARGS)
 {
 	while (buf->buf[pos] == ' ')
@@ -3336,7 +3357,7 @@ roff_nop(ROFF_ARGS)
 	return ROFF_RERUN;
 }
 
-static enum rofferr
+static int
 roff_tr(ROFF_ARGS)
 {
 	const char	*p, *first, *second;
@@ -3404,17 +3425,17 @@ roff_tr(ROFF_ARGS)
  * The read module will call that after rewinding the reader stack
  * to the place from where the current macro was called.
  */
-static enum rofferr
+static int
 roff_return(ROFF_ARGS)
 {
 	if (r->mstackpos >= 0)
-		return ROFF_USERRET;
+		return ROFF_IGN | ROFF_USERRET;
 
 	mandoc_msg(MANDOCERR_REQ_NOMAC, r->parse, ln, ppos, "return");
 	return ROFF_IGN;
 }
 
-static enum rofferr
+static int
 roff_rn(ROFF_ARGS)
 {
 	const char	*value;
@@ -3464,7 +3485,7 @@ roff_rn(ROFF_ARGS)
 	return ROFF_IGN;
 }
 
-static enum rofferr
+static int
 roff_shift(ROFF_ARGS)
 {
 	struct mctx	*ctx;
@@ -3497,7 +3518,7 @@ roff_shift(ROFF_ARGS)
 	return ROFF_IGN;
 }
 
-static enum rofferr
+static int
 roff_so(ROFF_ARGS)
 {
 	char *name, *cp;
@@ -3529,7 +3550,7 @@ roff_so(ROFF_ARGS)
 
 /* --- user defined strings and macros ------------------------------------ */
 
-static enum rofferr
+static int
 roff_userdef(ROFF_ARGS)
 {
 	struct mctx	 *ctx;
@@ -3583,14 +3604,14 @@ roff_userdef(ROFF_ARGS)
 	*offs = 0;
 
 	return buf->sz > 1 && buf->buf[buf->sz - 2] == '\n' ?
-	   ROFF_USERCALL : ROFF_APPEND;
+	    ROFF_REPARSE | ROFF_USERCALL : ROFF_IGN | ROFF_APPEND;
 }
 
 /*
  * Calling a high-level macro that was renamed with .rn.
  * r->current_string has already been set up by roff_parse().
  */
-static enum rofferr
+static int
 roff_renamed(ROFF_ARGS)
 {
 	char	*nbuf;
Index: mandoc.h
===================================================================
RCS file: /home/cvs/mandoc/mandoc/mandoc.h,v
retrieving revision 1.251
retrieving revision 1.252
diff -Lmandoc.h -Lmandoc.h -u -p -r1.251 -r1.252
--- mandoc.h
+++ mandoc.h
@@ -228,6 +228,10 @@ enum	mandocerr {
 	MANDOCERR_TOOLARGE, /* input too large */
 	MANDOCERR_CHAR_UNSUPP, /* unsupported control character: number */
 	MANDOCERR_REQ_UNSUPP, /* unsupported roff request: request */
+	MANDOCERR_WHILE_NEST, /* nested .while loops */
+	MANDOCERR_WHILE_OUTOF, /* end of scope with open .while loop */
+	MANDOCERR_WHILE_INTO, /* end of .while loop in inner scope */
+	MANDOCERR_WHILE_FAIL, /* cannot continue this .while loop */
 	MANDOCERR_TBLOPT_EQN, /* eqn delim option in tbl: arg */
 	MANDOCERR_TBLLAYOUT_MOD, /* unsupported tbl layout modifier: m */
 	MANDOCERR_TBLMACRO, /* ignoring macro in table: macro */
Index: TODO
===================================================================
RCS file: /home/cvs/mandoc/mandoc/TODO,v
retrieving revision 1.268
retrieving revision 1.269
diff -LTODO -LTODO -u -p -r1.268 -r1.269
--- TODO
+++ TODO
@@ -57,10 +57,6 @@ are mere guesses, and some may be wrong.
   reported by brad@  Sat, 15 Jan 2011 15:45:23 -0500
   loc ***  exist ***  algo ***  size **  imp *
 
-- .while
-  found by jca@ in ratpoison(1)  Sun, 30 Jun 2013 12:01:09 +0200
-  loc *  exist **  algo **  size **  imp **
-
 - \w'' improve width measurements
   would not be very useful without an expression parser, see below
   needed for Tcl_NewStringObj(3) via wiz@  Wed, 5 Mar 2014 22:27:43 +0100
Index: tbl.3
===================================================================
RCS file: /home/cvs/mandoc/mandoc/tbl.3,v
retrieving revision 1.2
retrieving revision 1.3
diff -Ltbl.3 -Ltbl.3 -u -p -r1.2 -r1.3
--- tbl.3
+++ tbl.3
@@ -35,7 +35,7 @@
 .Fa "int line"
 .Fa "struct mparse *parse"
 .Fc
-.Ft enum rofferr
+.Ft void
 .Fo tbl_read
 .Fa "struct tbl_node *tbl"
 .Fa "int ln"
Index: libmandoc.h
===================================================================
RCS file: /home/cvs/mandoc/mandoc/libmandoc.h,v
retrieving revision 1.73
retrieving revision 1.74
diff -Llibmandoc.h -Llibmandoc.h -u -p -r1.73 -r1.74
--- libmandoc.h
+++ libmandoc.h
@@ -16,16 +16,27 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-enum	rofferr {
-	ROFF_CONT, /* continue processing line */
-	ROFF_RERUN, /* re-run roff interpreter with offset */
-	ROFF_APPEND, /* re-run main parser, appending next line */
-	ROFF_REPARSE, /* re-run main parser on the result */
-	ROFF_USERCALL, /* dto., calling a user-defined macro */
-	ROFF_USERRET, /* abort parsing of user-defined macro */
-	ROFF_SO, /* include another file */
-	ROFF_IGN, /* ignore current line */
-};
+/*
+ * Return codes passed from the roff parser to the main parser.
+ */
+
+/* Main instruction: what to do with the returned line. */
+#define	ROFF_IGN	0x000	/* Don't do anything with it. */
+#define	ROFF_CONT	0x001	/* Give it to the high-level parser. */
+#define	ROFF_RERUN	0x002	/* Re-run the roff parser with an offset. */
+#define	ROFF_REPARSE	0x004	/* Recursively run the main parser on it. */
+#define	ROFF_SO		0x008	/* Include the named file. */
+#define	ROFF_MASK	0x00f	/* Only one of these bits should be set. */
+
+/* Options for further parsing, to be OR'ed with the above. */
+#define	ROFF_APPEND	0x010	/* Append the next line to this one. */
+#define	ROFF_USERCALL	0x020	/* Start execution of a new macro. */
+#define	ROFF_USERRET	0x040	/* Abort execution of the current macro. */
+#define	ROFF_WHILE	0x100	/* Start a new .while loop. */
+#define	ROFF_LOOPCONT	0x200	/* Iterate the current .while loop. */
+#define	ROFF_LOOPEXIT	0x400	/* Exit the current .while loop. */
+#define	ROFF_LOOPMASK	0xf00
+
 
 struct	buf {
 	char		*buf;
@@ -66,7 +77,7 @@ void		 roff_man_free(struct roff_man *);
 struct roff_man	*roff_man_alloc(struct roff *, struct mparse *,
 			const char *, int);
 void		 roff_man_reset(struct roff_man *);
-enum rofferr	 roff_parseln(struct roff *, int, struct buf *, int *);
+int		 roff_parseln(struct roff *, int, struct buf *, int *);
 void		 roff_userret(struct roff *);
 void		 roff_endparse(struct roff *);
 void		 roff_setreg(struct roff *, const char *, int, char sign);
Index: mandoc_headers.3
===================================================================
RCS file: /home/cvs/mandoc/mandoc/mandoc_headers.3,v
retrieving revision 1.18
retrieving revision 1.19
diff -Lmandoc_headers.3 -Lmandoc_headers.3 -u -p -r1.18 -r1.19
--- mandoc_headers.3
+++ mandoc_headers.3
@@ -250,7 +250,6 @@ for
 .Vt enum mandocerr .
 .Pp
 Provides
-.Vt enum rofferr ,
 .Vt struct buf ,
 utility functions needed by multiple parsers,
 and the top-level functions to call the parsers.
Index: roff.7
===================================================================
RCS file: /home/cvs/mandoc/mandoc/roff.7,v
retrieving revision 1.103
retrieving revision 1.104
diff -Lroff.7 -Lroff.7 -u -p -r1.103 -r1.104
--- roff.7
+++ roff.7
@@ -1202,7 +1202,7 @@ While evaluating the
 the unit suffixes described below
 .Sx Scaling Widths
 are ignored.
-.It Ic \&it Ar expression macro
+.It Ic \&itc Ar expression macro
 Set an input line trap, not counting lines ending with \ec.
 Currently unsupported.
 .It Ic \&IX Ar class keystring
@@ -1715,8 +1715,12 @@ This is a Heirloom extension and current
 Set a page location trap.
 Currently unsupported.
 .It Ic \&while Ar condition body
-Repeated execution while a condition is true.
-Currently unsupported.
+Repeated execution while a
+.Ar condition
+is true, with syntax similar to
+.Ic \&if .
+Currently implemented with two restrictions: cannot nest,
+and each loop must start and end in the same scope.
 .It Ic \&write Oo \(dq Oc Ns Ar string
 Write to an open file.
 Ignored because insecure.
@@ -2149,10 +2153,6 @@ macro control character does not suppres
 .It
 Diversions are not implemented,
 and support for traps is very incomplete.
-.It
-While recursion is supported,
-.Sx \&while
-loops are not.
 .El
 .Pp
 The special semantics of the
Index: Makefile
===================================================================
RCS file: /home/cvs/mandoc/mandoc/regress/roff/Makefile,v
retrieving revision 1.6
retrieving revision 1.7
diff -Lregress/roff/Makefile -Lregress/roff/Makefile -u -p -r1.6 -r1.7
--- regress/roff/Makefile
+++ regress/roff/Makefile
@@ -1,7 +1,8 @@
-# $OpenBSD: Makefile,v 1.25 2018/08/23 14:16:12 schwarze Exp $
+# $OpenBSD: Makefile,v 1.26 2018/08/24 22:56:37 schwarze Exp $
 
 SUBDIR  = args cond esc scale string
-SUBDIR += br cc de ds ft ig it ll na nr po ps return rm rn shift sp ta ti tr
+SUBDIR += br cc de ds ft ig it ll na nr po ps
+SUBDIR += return rm rn shift sp ta ti tr while
 
 .include "../Makefile.sub"
 .include <bsd.subdir.mk>
--- /dev/null
+++ regress/roff/while/outof.out_ascii
@@ -0,0 +1,9 @@
+WHILE-OUTOF(1)              General Commands Manual             WHILE-OUTOF(1)
+
+NNAAMMEE
+     wwhhiillee--oouuttooff - while request starting in a macro
+
+DDEESSCCRRIIPPTTIIOONN
+     initial text 10 final text
+
+OpenBSD                         August 24, 2018                        OpenBSD
--- /dev/null
+++ regress/roff/while/Makefile
@@ -0,0 +1,13 @@
+# $OpenBSD: Makefile,v 1.1 2018/08/24 22:56:37 schwarze Exp $
+
+REGRESS_TARGETS	= basic badargs into nesting outof
+LINT_TARGETS	= badargs into nesting outof
+
+# mandoc defects:
+#  - if a while loop extends into a scope, mandoc may close it there
+#  - mandoc does not support nested .while loops
+#  - mandoc does not support .while loops extending out of the current scope
+
+SKIP_GROFF	= into nesting outof
+
+.include <bsd.regress.mk>
--- /dev/null
+++ regress/roff/while/basic.out_ascii
@@ -0,0 +1,16 @@
+WHILE-BASIC(1)              General Commands Manual             WHILE-BASIC(1)
+
+NNAAMMEE
+     wwhhiillee--bbaassiicc - the while request
+
+DDEESSCCRRIIPPTTIIOONN
+     Loop with single-line scope: 10 9 8 7 6 5 4 3 2 1 0
+
+     Loop with multi-line scope, text line closure: 10, 9, 8, 7, 6, 5, 4, 3,
+     2, 1, 0, boom.
+
+     Loop with multi-line scope, macro line closure: 10 9 8 7 6 5 4 3 2 1 0
+
+     final text
+
+OpenBSD                         August 24, 2018                        OpenBSD
--- /dev/null
+++ regress/roff/while/nesting.in
@@ -0,0 +1,19 @@
+.\" $OpenBSD: nesting.in,v 1.1 2018/08/24 22:56:37 schwarze Exp $
+.Dd $Mdocdate: August 24 2018 $
+.Dt WHILE-NESTING 1
+.Os
+.Sh NAME
+.Nm while-nesting
+.Nd nested while requests
+.Sh DESCRIPTION
+initial text
+.nr c1 3
+.while \n(c1 \{\
+.  nr c2 3
+.  while \n(c2 \{\
+.    nop \n(c1\n(c2
+.    nr c2 -1
+.  \}
+.  nr c1 -1
+.\}
+final text
--- /dev/null
+++ regress/roff/while/into.out_lint
@@ -0,0 +1,2 @@
+mandoc: into.in:17:5: UNSUPP: end of .while loop in inner scope
+mandoc: into.in:20:1: UNSUPP: end of scope with open .while loop
--- /dev/null
+++ regress/roff/while/badargs.in
@@ -0,0 +1,14 @@
+.\" $OpenBSD: badargs.in,v 1.1 2018/08/24 22:56:37 schwarze Exp $
+.Dd $Mdocdate: August 24 2018 $
+.Dt WHILE-BADARGS 1
+.Os
+.Sh NAME
+.Nm while-badargs
+.Nd dubious arguments for the while request
+.Sh DESCRIPTION
+while does not support next line scope:
+.nr cnt 2 1
+.while \n-[cnt]
+\n[cnt]
+.Pp
+final text
--- /dev/null
+++ regress/roff/while/badargs.out_lint
@@ -0,0 +1,3 @@
+mandoc: badargs.in:11:2: WARNING: conditional request controls empty scope: while
+mandoc: badargs.in:11:9: WARNING: blank line in fill mode, using .sp
+mandoc: badargs.in:11:2: WARNING: conditional request controls empty scope: while
--- /dev/null
+++ regress/roff/while/outof.out_lint
@@ -0,0 +1,2 @@
+mandoc: outof.in:15:1: UNSUPP: end of scope with open .while loop
+mandoc: outof.in:17:4: UNSUPP: cannot continue this .while loop
--- /dev/null
+++ regress/roff/while/nesting.out_ascii
@@ -0,0 +1,9 @@
+WHILE-NESTING(1)            General Commands Manual           WHILE-NESTING(1)
+
+NNAAMMEE
+     wwhhiillee--nneessttiinngg - nested while requests
+
+DDEESSCCRRIIPPTTIIOONN
+     initial text 33 32 31 final text
+
+OpenBSD                         August 24, 2018                        OpenBSD
--- /dev/null
+++ regress/roff/while/nesting.out_lint
@@ -0,0 +1,2 @@
+mandoc: nesting.in:14:37: UNSUPP: nested .while loops
+mandoc: nesting.in:18:4: UNSUPP: cannot continue this .while loop
--- /dev/null
+++ regress/roff/while/outof.in
@@ -0,0 +1,18 @@
+.\" $OpenBSD: outof.in,v 1.1 2018/08/24 22:56:37 schwarze Exp $
+.Dd $Mdocdate: August 24 2018 $
+.Dt WHILE-OUTOF 1
+.Os
+.Sh NAME
+.Nm while-outof
+.Nd while request starting in a macro
+.Sh DESCRIPTION
+.nr cnt 10
+.de mym
+.  while \\n[cnt] \{\
+.    nop \\n[cnt]
+..
+initial text
+.mym
+.  nr cnt -1
+.\}
+final text
--- /dev/null
+++ regress/roff/while/badargs.out_ascii
@@ -0,0 +1,13 @@
+WHILE-BADARGS(1)            General Commands Manual           WHILE-BADARGS(1)
+
+NNAAMMEE
+     wwhhiillee--bbaaddaarrggss - dubious arguments for the while request
+
+DDEESSCCRRIIPPTTIIOONN
+     while does not support next line scope:
+
+     0
+
+     final text
+
+OpenBSD                         August 24, 2018                        OpenBSD
--- /dev/null
+++ regress/roff/while/basic.in
@@ -0,0 +1,30 @@
+.\" $OpenBSD: basic.in,v 1.1 2018/08/24 22:56:37 schwarze Exp $
+.Dd $Mdocdate: August 24 2018 $
+.Dt WHILE-BASIC 1
+.Os
+.Sh NAME
+.Nm while-basic
+.Nd the while request
+.Sh DESCRIPTION
+Loop with single-line scope:
+.nr cnt 11 1
+.de mym
+\\n-[cnt]
+..
+.while \n[cnt] .mym
+.Pp
+Loop with multi-line scope, text line closure:
+.nr cnt 11
+.while \n[cnt] \{\
+.nr cnt -1
+\n[cnt]\},
+boom.
+.Pp
+Loop with multi-line scope, macro line closure:
+.nr cnt 11
+.while \n[cnt] \{\
+.nr cnt -1
+\n[cnt]
+.\}
+.Pp
+final text
--- /dev/null
+++ regress/roff/while/into.in
@@ -0,0 +1,20 @@
+.\" $OpenBSD: into.in,v 1.1 2018/08/24 22:56:37 schwarze Exp $
+.Dd $Mdocdate: August 24 2018 $
+.Dt WHILE-INTO 1
+.Os
+.Sh NAME
+.Nm while-into
+.Nd while request extending into a macro
+.Sh DESCRIPTION
+.nr cnt 10
+.de closeloop
+.nr cnt -1
+.\}
+..
+initial text
+.while \n[cnt] \{\
+\n[cnt]
+.closeloop
+after macro
+.\}
+final text
--- /dev/null
+++ regress/roff/while/into.out_ascii
@@ -0,0 +1,9 @@
+WHILE-INTO(1)               General Commands Manual              WHILE-INTO(1)
+
+NNAAMMEE
+     wwhhiillee--iinnttoo - while request extending into a macro
+
+DDEESSCCRRIIPPTTIIOONN
+     initial text 10 after macro final text
+
+OpenBSD                         August 24, 2018                        OpenBSD
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