5025 import and use mandoc

Reviewed by: Hans Rosenfeld <hans.rosenfeld@nexenta.com>
Reviewed by: Igor Kozhukhov <ikozhukhov@gmail.com>
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Albert Lee <trisk@nexenta.com>
Approved by: Dan McDonald <danmcd@omniti.com>

1 files changed, 637 insertions, 0 deletions

diff --git a/usr/src/cmd/mandoc/mdoc_man.c b/usr/src/cmd/mandoc/mdoc_man.c
new file mode 100644
index 0000000000..9d7d2ca238
--- /dev/null
+++ b/usr/src/cmd/mandoc/mdoc_man.c
@@ -0,0 +1,637 @@
+/*	$Id: mdoc_man.c,v 1.9 2011/10/24 21:47:59 schwarze Exp $ */
+/*
+ * Copyright (c) 2011 Ingo Schwarze <schwarze@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdio.h>
+#include <string.h>
+
+#include "mandoc.h"
+#include "man.h"
+#include "mdoc.h"
+#include "main.h"
+
+#define	DECL_ARGS const struct mdoc_meta *m, \
+		  const struct mdoc_node *n, \
+		  struct mman *mm
+
+struct	mman {
+	int		  need_space; /* next word needs prior ws */
+	int		  need_nl; /* next word needs prior nl */
+};
+
+struct	manact {
+	int		(*cond)(DECL_ARGS); /* DON'T run actions */
+	int		(*pre)(DECL_ARGS); /* pre-node action */
+	void		(*post)(DECL_ARGS); /* post-node action */
+	const char	 *prefix; /* pre-node string constant */
+	const char	 *suffix; /* post-node string constant */
+};
+
+static	int	  cond_body(DECL_ARGS);
+static	int	  cond_head(DECL_ARGS);
+static	void	  post_bd(DECL_ARGS);
+static	void	  post_dl(DECL_ARGS);
+static	void	  post_enc(DECL_ARGS);
+static	void	  post_nm(DECL_ARGS);
+static	void	  post_percent(DECL_ARGS);
+static	void	  post_pf(DECL_ARGS);
+static	void	  post_sect(DECL_ARGS);
+static	void	  post_sp(DECL_ARGS);
+static	int	  pre_ap(DECL_ARGS);
+static	int	  pre_bd(DECL_ARGS);
+static	int	  pre_br(DECL_ARGS);
+static	int	  pre_bx(DECL_ARGS);
+static	int	  pre_dl(DECL_ARGS);
+static	int	  pre_enc(DECL_ARGS);
+static	int	  pre_it(DECL_ARGS);
+static	int	  pre_nm(DECL_ARGS);
+static	int	  pre_ns(DECL_ARGS);
+static	int	  pre_pp(DECL_ARGS);
+static	int	  pre_sp(DECL_ARGS);
+static	int	  pre_sect(DECL_ARGS);
+static	int	  pre_ux(DECL_ARGS);
+static	int	  pre_xr(DECL_ARGS);
+static	void	  print_word(struct mman *, const char *);
+static	void	  print_node(DECL_ARGS);
+
+static	const struct manact manacts[MDOC_MAX + 1] = {
+	{ NULL, pre_ap, NULL, NULL, NULL }, /* Ap */
+	{ NULL, NULL, NULL, NULL, NULL }, /* Dd */
+	{ NULL, NULL, NULL, NULL, NULL }, /* Dt */
+	{ NULL, NULL, NULL, NULL, NULL }, /* Os */
+	{ NULL, pre_sect, post_sect, ".SH", NULL }, /* Sh */
+	{ NULL, pre_sect, post_sect, ".SS", NULL }, /* Ss */
+	{ NULL, pre_pp, NULL, NULL, NULL }, /* Pp */
+	{ cond_body, pre_dl, post_dl, NULL, NULL }, /* D1 */
+	{ cond_body, pre_dl, post_dl, NULL, NULL }, /* Dl */
+	{ cond_body, pre_bd, post_bd, NULL, NULL }, /* Bd */
+	{ NULL, NULL, NULL, NULL, NULL }, /* Ed */
+	{ NULL, NULL, NULL, NULL, NULL }, /* Bl */
+	{ NULL, NULL, NULL, NULL, NULL }, /* El */
+	{ NULL, pre_it, NULL, NULL, NULL }, /* _It */
+	{ NULL, pre_enc, post_enc, "\\fI", "\\fP" }, /* Ad */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _An */
+	{ NULL, pre_enc, post_enc, "\\fI", "\\fP" }, /* Ar */
+	{ NULL, pre_enc, post_enc, "\\fB", "\\fP" }, /* Cd */
+	{ NULL, pre_enc, post_enc, "\\fB", "\\fP" }, /* Cm */
+	{ NULL, pre_enc, post_enc, "\\fR", "\\fP" }, /* Dv */
+	{ NULL, pre_enc, post_enc, "\\fR", "\\fP" }, /* Er */
+	{ NULL, pre_enc, post_enc, "\\fR", "\\fP" }, /* Ev */
+	{ NULL, pre_enc, post_enc, "The \\fB",
+	    "\\fP\nutility exits 0 on success, and >0 if an error occurs."
+	    }, /* Ex */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _Fa */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _Fd */
+	{ NULL, pre_enc, post_enc, "\\fB-", "\\fP" }, /* Fl */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _Fn */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _Ft */
+	{ NULL, pre_enc, post_enc, "\\fB", "\\fP" }, /* Ic */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _In */
+	{ NULL, pre_enc, post_enc, "\\fR", "\\fP" }, /* Li */
+	{ cond_head, pre_enc, NULL, "\\- ", NULL }, /* Nd */
+	{ NULL, pre_nm, post_nm, NULL, NULL }, /* Nm */
+	{ cond_body, pre_enc, post_enc, "[", "]" }, /* Op */
+	{ NULL, NULL, NULL, NULL, NULL }, /* Ot */
+	{ NULL, pre_enc, post_enc, "\\fI", "\\fP" }, /* Pa */
+	{ NULL, pre_enc, post_enc, "The \\fB",
+		"\\fP\nfunction returns the value 0 if successful;\n"
+		"otherwise the value -1 is returned and the global\n"
+		"variable \\fIerrno\\fP is set to indicate the error."
+		}, /* Rv */
+	{ NULL, NULL, NULL, NULL, NULL }, /* St */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _Va */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _Vt */
+	{ NULL, pre_xr, NULL, NULL, NULL }, /* Xr */
+	{ NULL, NULL, post_percent, NULL, NULL }, /* _%A */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _%B */
+	{ NULL, NULL, post_percent, NULL, NULL }, /* _%D */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _%I */
+	{ NULL, pre_enc, post_percent, "\\fI", "\\fP" }, /* %J */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _%N */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _%O */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _%P */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _%R */
+	{ NULL, pre_enc, post_percent, "\"", "\"" }, /* %T */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _%V */
+	{ NULL, NULL, NULL, NULL, NULL }, /* Ac */
+	{ cond_body, pre_enc, post_enc, "<", ">" }, /* Ao */
+	{ cond_body, pre_enc, post_enc, "<", ">" }, /* Aq */
+	{ NULL, NULL, NULL, NULL, NULL }, /* At */
+	{ NULL, NULL, NULL, NULL, NULL }, /* Bc */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _Bf */
+	{ cond_body, pre_enc, post_enc, "[", "]" }, /* Bo */
+	{ cond_body, pre_enc, post_enc, "[", "]" }, /* Bq */
+	{ NULL, pre_ux, NULL, "BSD/OS", NULL }, /* Bsx */
+	{ NULL, pre_bx, NULL, NULL, NULL }, /* Bx */
+	{ NULL, NULL, NULL, NULL, NULL }, /* Db */
+	{ NULL, NULL, NULL, NULL, NULL }, /* Dc */
+	{ cond_body, pre_enc, post_enc, "``", "''" }, /* Do */
+	{ cond_body, pre_enc, post_enc, "``", "''" }, /* Dq */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _Ec */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _Ef */
+	{ NULL, pre_enc, post_enc, "\\fI", "\\fP" }, /* Em */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _Eo */
+	{ NULL, pre_ux, NULL, "FreeBSD", NULL }, /* Fx */
+	{ NULL, pre_enc, post_enc, "\\fB", "\\fP" }, /* Ms */
+	{ NULL, NULL, NULL, NULL, NULL }, /* No */
+	{ NULL, pre_ns, NULL, NULL, NULL }, /* Ns */
+	{ NULL, pre_ux, NULL, "NetBSD", NULL }, /* Nx */
+	{ NULL, pre_ux, NULL, "OpenBSD", NULL }, /* Ox */
+	{ NULL, NULL, NULL, NULL, NULL }, /* Pc */
+	{ NULL, NULL, post_pf, NULL, NULL }, /* Pf */
+	{ cond_body, pre_enc, post_enc, "(", ")" }, /* Po */
+	{ cond_body, pre_enc, post_enc, "(", ")" }, /* Pq */
+	{ NULL, NULL, NULL, NULL, NULL }, /* Qc */
+	{ cond_body, pre_enc, post_enc, "`", "'" }, /* Ql */
+	{ cond_body, pre_enc, post_enc, "\"", "\"" }, /* Qo */
+	{ cond_body, pre_enc, post_enc, "\"", "\"" }, /* Qq */
+	{ NULL, NULL, NULL, NULL, NULL }, /* Re */
+	{ cond_body, pre_pp, NULL, NULL, NULL }, /* Rs */
+	{ NULL, NULL, NULL, NULL, NULL }, /* Sc */
+	{ cond_body, pre_enc, post_enc, "`", "'" }, /* So */
+	{ cond_body, pre_enc, post_enc, "`", "'" }, /* Sq */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _Sm */
+	{ NULL, pre_enc, post_enc, "\\fI", "\\fP" }, /* Sx */
+	{ NULL, pre_enc, post_enc, "\\fB", "\\fP" }, /* Sy */
+	{ NULL, pre_enc, post_enc, "\\fR", "\\fP" }, /* Tn */
+	{ NULL, pre_ux, NULL, "UNIX", NULL }, /* Ux */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _Xc */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _Xo */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _Fo */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _Fc */
+	{ cond_body, pre_enc, post_enc, "[", "]" }, /* Oo */
+	{ NULL, NULL, NULL, NULL, NULL }, /* Oc */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _Bk */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _Ek */
+	{ NULL, pre_ux, NULL, "is currently in beta test.", NULL }, /* Bt */
+	{ NULL, NULL, NULL, NULL, NULL }, /* Hf */
+	{ NULL, NULL, NULL, NULL, NULL }, /* Fr */
+	{ NULL, pre_ux, NULL, "currently under development.", NULL }, /* Ud */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _Lb */
+	{ NULL, pre_pp, NULL, NULL, NULL }, /* Lp */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _Lk */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _Mt */
+	{ cond_body, pre_enc, post_enc, "{", "}" }, /* Brq */
+	{ cond_body, pre_enc, post_enc, "{", "}" }, /* Bro */
+	{ NULL, NULL, NULL, NULL, NULL }, /* Brc */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _%C */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _Es */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _En */
+	{ NULL, pre_ux, NULL, "DragonFly", NULL }, /* Dx */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _%Q */
+	{ NULL, pre_br, NULL, NULL, NULL }, /* br */
+	{ NULL, pre_sp, post_sp, NULL, NULL }, /* sp */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _%U */
+	{ NULL, NULL, NULL, NULL, NULL }, /* _Ta */
+	{ NULL, NULL, NULL, NULL, NULL }, /* ROOT */
+};
+
+static void
+print_word(struct mman *mm, const char *s)
+{
+
+	if (mm->need_nl) {
+		/* 
+		 * If we need a newline, print it now and start afresh.
+		 */
+		putchar('\n');
+		mm->need_space = 0;
+		mm->need_nl = 0;
+	} else if (mm->need_space && '\0' != s[0])
+		/*
+		 * If we need a space, only print it before
+		 * (1) a nonzero length word;
+		 * (2) a word that is non-punctuation; and
+		 * (3) if punctuation, non-terminating puncutation.
+		 */
+		if (NULL == strchr(".,:;)]?!", s[0]) || '\0' != s[1])
+			putchar(' ');
+
+	/*
+	 * Reassign needing space if we're not following opening
+	 * punctuation.
+	 */
+	mm->need_space = 
+		('(' != s[0] && '[' != s[0]) || '\0' != s[1];
+
+	for ( ; *s; s++) {
+		switch (*s) {
+		case (ASCII_NBRSP):
+			printf("\\~");
+			break;
+		case (ASCII_HYPH):
+			putchar('-');
+			break;
+		default:
+			putchar((unsigned char)*s);
+			break;
+		}
+	}
+}
+
+void
+man_man(void *arg, const struct man *man)
+{
+
+	/*
+	 * Dump the keep buffer.
+	 * We're guaranteed by now that this exists (is non-NULL).
+	 * Flush stdout afterward, just in case.
+	 */
+	fputs(mparse_getkeep(man_mparse(man)), stdout);
+	fflush(stdout);
+}
+
+void
+man_mdoc(void *arg, const struct mdoc *mdoc)
+{
+	const struct mdoc_meta *m;
+	const struct mdoc_node *n;
+	struct mman	        mm;
+
+	m = mdoc_meta(mdoc);
+	n = mdoc_node(mdoc);
+
+	printf(".TH \"%s\" \"%s\" \"%s\" \"%s\" \"%s\"",
+			m->title, m->msec, m->date, m->os, m->vol);
+
+	memset(&mm, 0, sizeof(struct mman));
+
+	mm.need_nl = 1;
+	print_node(m, n, &mm);
+	putchar('\n');
+}
+
+static void
+print_node(DECL_ARGS)
+{
+	const struct mdoc_node	*prev, *sub;
+	const struct manact	*act;
+	int			 cond, do_sub;
+	
+	/*
+	 * Break the line if we were parsed subsequent the current node.
+	 * This makes the page structure be more consistent.
+	 */
+	prev = n->prev ? n->prev : n->parent;
+	if (prev && prev->line < n->line)
+		mm->need_nl = 1;
+
+	act = NULL;
+	cond = 0;
+	do_sub = 1;
+
+	if (MDOC_TEXT == n->type) {
+		/*
+		 * Make sure that we don't happen to start with a
+		 * control character at the start of a line.
+		 */
+		if (mm->need_nl && ('.' == *n->string || 
+					'\'' == *n->string)) {
+			print_word(mm, "\\&");
+			mm->need_space = 0;
+		}
+		print_word(mm, n->string);
+	} else {
+		/*
+		 * Conditionally run the pre-node action handler for a
+		 * node.
+		 */
+		act = manacts + n->tok;
+		cond = NULL == act->cond || (*act->cond)(m, n, mm);
+		if (cond && act->pre)
+			do_sub = (*act->pre)(m, n, mm);
+	}
+
+	/* 
+	 * Conditionally run all child nodes.
+	 * Note that this iterates over children instead of using
+	 * recursion.  This prevents unnecessary depth in the stack.
+	 */
+	if (do_sub)
+		for (sub = n->child; sub; sub = sub->next)
+			print_node(m, sub, mm);
+
+	/*
+	 * Lastly, conditionally run the post-node handler.
+	 */
+	if (cond && act->post)
+		(*act->post)(m, n, mm);
+}
+
+static int
+cond_head(DECL_ARGS)
+{
+
+	return(MDOC_HEAD == n->type);
+}
+
+static int
+cond_body(DECL_ARGS)
+{
+
+	return(MDOC_BODY == n->type);
+}
+
+/*
+ * Output a font encoding before a node, e.g., \fR.
+ * This obviously has no trailing space.
+ */
+static int
+pre_enc(DECL_ARGS)
+{
+	const char	*prefix;
+
+	prefix = manacts[n->tok].prefix;
+	if (NULL == prefix)
+		return(1);
+	print_word(mm, prefix);
+	mm->need_space = 0;
+	return(1);
+}
+
+/*
+ * Output a font encoding subsequent a node, e.g., \fP.
+ */
+static void
+post_enc(DECL_ARGS)
+{
+	const char *suffix;
+
+	suffix = manacts[n->tok].suffix;
+	if (NULL == suffix)
+		return;
+	mm->need_space = 0;
+	print_word(mm, suffix);
+}
+
+/*
+ * Used in listings (percent = %A, e.g.).
+ * FIXME: this is incomplete. 
+ * It doesn't print a nice ", and" for lists.
+ */
+static void
+post_percent(DECL_ARGS)
+{
+
+	post_enc(m, n, mm);
+	if (n->next)
+		print_word(mm, ",");
+	else {
+		print_word(mm, ".");
+		mm->need_nl = 1;
+	}
+}
+
+/*
+ * Print before a section header.
+ */
+static int
+pre_sect(DECL_ARGS)
+{
+
+	if (MDOC_HEAD != n->type)
+		return(1);
+	mm->need_nl = 1;
+	print_word(mm, manacts[n->tok].prefix);
+	print_word(mm, "\"");
+	mm->need_space = 0;
+	return(1);
+}
+
+/*
+ * Print subsequent a section header.
+ */
+static void
+post_sect(DECL_ARGS)
+{
+
+	if (MDOC_HEAD != n->type)
+		return;
+	mm->need_space = 0;
+	print_word(mm, "\"");
+	mm->need_nl = 1;
+}
+
+static int
+pre_ap(DECL_ARGS)
+{
+
+	mm->need_space = 0;
+	print_word(mm, "'");
+	mm->need_space = 0;
+	return(0);
+}
+
+static int
+pre_bd(DECL_ARGS)
+{
+
+	if (DISP_unfilled == n->norm->Bd.type ||
+	    DISP_literal  == n->norm->Bd.type) {
+		mm->need_nl = 1;
+		print_word(mm, ".nf");
+	}
+	mm->need_nl = 1;
+	return(1);
+}
+
+static void
+post_bd(DECL_ARGS)
+{
+
+	if (DISP_unfilled == n->norm->Bd.type ||
+	    DISP_literal  == n->norm->Bd.type) {
+		mm->need_nl = 1;
+		print_word(mm, ".fi");
+	}
+	mm->need_nl = 1;
+}
+
+static int
+pre_br(DECL_ARGS)
+{
+
+	mm->need_nl = 1;
+	print_word(mm, ".br");
+	mm->need_nl = 1;
+	return(0);
+}
+
+static int
+pre_bx(DECL_ARGS)
+{
+
+	n = n->child;
+	if (n) {
+		print_word(mm, n->string);
+		mm->need_space = 0;
+		n = n->next;
+	}
+	print_word(mm, "BSD");
+	if (NULL == n)
+		return(0);
+	mm->need_space = 0;
+	print_word(mm, "-");
+	mm->need_space = 0;
+	print_word(mm, n->string);
+	return(0);
+}
+
+static int
+pre_dl(DECL_ARGS)
+{
+
+	mm->need_nl = 1;
+	print_word(mm, ".RS 6n");
+	mm->need_nl = 1;
+	return(1);
+}
+
+static void
+post_dl(DECL_ARGS)
+{
+
+	mm->need_nl = 1;
+	print_word(mm, ".RE");
+	mm->need_nl = 1;
+}
+
+static int
+pre_it(DECL_ARGS)
+{
+	const struct mdoc_node *bln;
+
+	if (MDOC_HEAD == n->type) {
+		mm->need_nl = 1;
+		print_word(mm, ".TP");
+		bln = n->parent->parent->prev;
+		switch (bln->norm->Bl.type) {
+		case (LIST_bullet):
+			print_word(mm, "4n");
+			mm->need_nl = 1;
+			print_word(mm, "\\fBo\\fP");
+			break;
+		default:
+			if (bln->norm->Bl.width)
+				print_word(mm, bln->norm->Bl.width);
+			break;
+		}
+		mm->need_nl = 1;
+	}
+	return(1);
+}
+
+static int
+pre_nm(DECL_ARGS)
+{
+
+	if (MDOC_ELEM != n->type && MDOC_HEAD != n->type)
+		return(1);
+	print_word(mm, "\\fB");
+	mm->need_space = 0;
+	if (NULL == n->child)
+		print_word(mm, m->name);
+	return(1);
+}
+
+static void
+post_nm(DECL_ARGS)
+{
+
+	if (MDOC_ELEM != n->type && MDOC_HEAD != n->type)
+		return;
+	mm->need_space = 0;
+	print_word(mm, "\\fP");
+}
+
+static int
+pre_ns(DECL_ARGS)
+{
+
+	mm->need_space = 0;
+	return(0);
+}
+
+static void
+post_pf(DECL_ARGS)
+{
+
+	mm->need_space = 0;
+}
+
+static int
+pre_pp(DECL_ARGS)
+{
+
+	mm->need_nl = 1;
+	if (MDOC_It == n->parent->tok)
+		print_word(mm, ".sp");
+	else
+		print_word(mm, ".PP");
+	mm->need_nl = 1;
+	return(1);
+}
+
+static int
+pre_sp(DECL_ARGS)
+{
+
+	mm->need_nl = 1;
+	print_word(mm, ".sp");
+	return(1);
+}
+
+static void
+post_sp(DECL_ARGS)
+{
+
+	mm->need_nl = 1;
+}
+
+static int
+pre_xr(DECL_ARGS)
+{
+
+	n = n->child;
+	if (NULL == n)
+		return(0);
+	print_node(m, n, mm);
+	n = n->next;
+	if (NULL == n)
+		return(0);
+	mm->need_space = 0;
+	print_word(mm, "(");
+	print_node(m, n, mm);
+	print_word(mm, ")");
+	return(0);
+}
+
+static int
+pre_ux(DECL_ARGS)
+{
+
+	print_word(mm, manacts[n->tok].prefix);
+	if (NULL == n->child)
+		return(0);
+	mm->need_space = 0;
+	print_word(mm, "\\~");
+	mm->need_space = 0;
+	return(1);
+}