===================================================================
RCS file: /cvs/mandoc/mdoc.c,v
retrieving revision 1.96
retrieving revision 1.135
diff -u -p -r1.96 -r1.135
--- mandoc/mdoc.c	2009/07/27 19:43:02	1.96
+++ mandoc/mdoc.c	2010/05/16 10:59:36	1.135
@@ -1,4 +1,4 @@
-/*	$Id: mdoc.c,v 1.96 2009/07/27 19:43:02 kristaps Exp $ */
+/*	$Id: mdoc.c,v 1.135 2010/05/16 10:59:36 kristaps Exp $ */
 /*
  * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@kth.se>
  *
@@ -14,22 +14,28 @@
  * 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 <sys/types.h>
+
 #include <assert.h>
 #include <ctype.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <time.h>
 
 #include "libmdoc.h"
+#include "libmandoc.h"
 
 const	char *const __mdoc_merrnames[MERRMAX] = {		 
 	"trailing whitespace", /* ETAILWS */
 	"unexpected quoted parameter", /* EQUOTPARM */
 	"unterminated quoted parameter", /* EQUOTTERM */
-	"system: malloc error", /* EMALLOC */
 	"argument parameter suggested", /* EARGVAL */
-	"macro not callable", /* ENOCALL */
 	"macro disallowed in prologue", /* EBODYPROL */
 	"macro disallowed in body", /* EPROLBODY */
 	"text disallowed in prologue", /* ETEXTPROL */
@@ -63,21 +69,21 @@ const	char *const __mdoc_merrnames[MERRMAX] = {		 
 	"prologue macro out of conventional order", /* EPROLOOO */
 	"prologue macro repeated", /* EPROLREP */
 	"invalid manual section", /* EBADMSEC */
-	"invalid section", /* EBADSEC */
 	"invalid font mode", /* EFONT */
 	"invalid date syntax", /* EBADDATE */
 	"invalid number format", /* ENUMFMT */
 	"superfluous width argument", /* ENOWIDTH */
 	"system: utsname error", /* EUTSNAME */
 	"obsolete macro", /* EOBS */
-	"macro-like parameter", /* EMACPARM */
 	"end-of-line scope violation", /* EIMPBRK */
 	"empty macro ignored", /* EIGNE */
 	"unclosed explicit scope", /* EOPEN */
 	"unterminated quoted phrase", /* EQUOTPHR */
 	"closure macro without prior context", /* ENOCTX */
-	"invalid whitespace after control character", /* ESPACE */
-	"no description found for library" /* ELIB */
+	"no description found for library", /* ELIB */
+	"bad child for parent context", /* EBADCHILD */
+	"list arguments preceding type", /* ENOTYPE */
+	"deprecated comment style", /* EBADCOMMENT */
 };
 
 const	char *const __mdoc_macronames[MDOC_MAX] = {		 
@@ -92,11 +98,11 @@ const	char *const __mdoc_macronames[MDOC_MAX] = {		 
 	"Nm",		"Op",		"Ot",		"Pa",
 	"Rv",		"St",		"Va",		"Vt",
 	/* LINTED */
-	"Xr",		"\%A",		"\%B",		"\%D",
+	"Xr",		"%A",		"%B",		"%D",
 	/* LINTED */
-	"\%I",		"\%J",		"\%N",		"\%O",
+	"%I",		"%J",		"%N",		"%O",
 	/* LINTED */
-	"\%P",		"\%R",		"\%T",		"\%V",
+	"%P",		"%R",		"%T",		"%V",
 	"Ac",		"Ao",		"Aq",		"At",
 	"Bc",		"Bf",		"Bo",		"Bq",
 	"Bsx",		"Bx",		"Db",		"Dc",
@@ -113,9 +119,11 @@ const	char *const __mdoc_macronames[MDOC_MAX] = {		 
 	"Fr",		"Ud",		"Lb",		"Lp",
 	"Lk",		"Mt",		"Brq",		"Bro",
 	/* LINTED */
-	"Brc",		"\%C",		"Es",		"En",
+	"Brc",		"%C",		"Es",		"En",
 	/* LINTED */
-	"Dx",		"\%Q",		"br",		"sp"
+	"Dx",		"%Q",		"br",		"sp",
+	/* LINTED */
+	"%U"
 	};
 
 const	char *const __mdoc_argnames[MDOC_ARG_MAX] = {		 
@@ -127,29 +135,27 @@ const	char *const __mdoc_argnames[MDOC_ARG_MAX] = {		 
 	"ohang",		"inset",		"column",	 
 	"width",		"compact",		"std",	 
 	"filled",		"words",		"emphasis",
-	"symbolic",		"nested"
+	"symbolic",		"nested",		"centered"
 	};
 
 const	char * const *mdoc_macronames = __mdoc_macronames;
 const	char * const *mdoc_argnames = __mdoc_argnames;
 
+static	void		  mdoc_node_free(struct mdoc_node *);
+static	void		  mdoc_node_unlink(struct mdoc *, 
+				struct mdoc_node *);
 static	void		  mdoc_free1(struct mdoc *);
-static	int		  mdoc_alloc1(struct mdoc *);
+static	void		  mdoc_alloc1(struct mdoc *);
 static	struct mdoc_node *node_alloc(struct mdoc *, int, int, 
-				int, enum mdoc_type);
+				enum mdoct, enum mdoc_type);
 static	int		  node_append(struct mdoc *, 
 				struct mdoc_node *);
-static	int		  parsetext(struct mdoc *, int, char *);
-static	int		  parsemacro(struct mdoc *, int, char *);
-static	int		  macrowarn(struct mdoc *, int, const char *);
-static	int		  pstring(struct mdoc *, int, int, 
-				const char *, size_t);
+static	int		  mdoc_ptext(struct mdoc *, int, char *, int);
+static	int		  mdoc_pmacro(struct mdoc *, int, char *, int);
+static	int		  macrowarn(struct mdoc *, int, 
+				const char *, int);
 
-#ifdef __linux__
-extern	size_t	  	  strlcpy(char *, const char *, size_t);
-#endif
 
-
 const struct mdoc_node *
 mdoc_node(const struct mdoc *m)
 {
@@ -174,7 +180,7 @@ mdoc_free1(struct mdoc *mdoc)
 {
 
 	if (mdoc->first)
-		mdoc_node_freelist(mdoc->first);
+		mdoc_node_delete(mdoc, mdoc->first);
 	if (mdoc->meta.title)
 		free(mdoc->meta.title);
 	if (mdoc->meta.os)
@@ -185,27 +191,25 @@ mdoc_free1(struct mdoc *mdoc)
 		free(mdoc->meta.arch);
 	if (mdoc->meta.vol)
 		free(mdoc->meta.vol);
+	if (mdoc->meta.msec)
+		free(mdoc->meta.msec);
 }
 
 
 /*
  * Allocate all volatile resources (parse tree, meta-data, fields).
  */
-static int
+static void
 mdoc_alloc1(struct mdoc *mdoc)
 {
 
-	bzero(&mdoc->meta, sizeof(struct mdoc_meta));
+	memset(&mdoc->meta, 0, sizeof(struct mdoc_meta));
 	mdoc->flags = 0;
 	mdoc->lastnamed = mdoc->lastsec = SEC_NONE;
-	mdoc->last = calloc(1, sizeof(struct mdoc_node));
-	if (NULL == mdoc->last)
-		return(0);
-
+	mdoc->last = mandoc_calloc(1, sizeof(struct mdoc_node));
 	mdoc->first = mdoc->last;
 	mdoc->last->type = MDOC_ROOT;
 	mdoc->next = MDOC_NEXT_CHILD;
-	return(1);
 }
 
 
@@ -215,12 +219,12 @@ mdoc_alloc1(struct mdoc *mdoc)
  * and the parser is ready for re-invocation on a new tree; however,
  * cross-parse non-volatile data is kept intact.
  */
-int
+void
 mdoc_reset(struct mdoc *mdoc)
 {
 
 	mdoc_free1(mdoc);
-	return(mdoc_alloc1(mdoc));
+	mdoc_alloc1(mdoc);
 }
 
 
@@ -233,8 +237,6 @@ mdoc_free(struct mdoc *mdoc)
 {
 
 	mdoc_free1(mdoc);
-	if (mdoc->htab)
-		mdoc_hash_free(mdoc->htab);
 	free(mdoc);
 }
 
@@ -247,22 +249,17 @@ mdoc_alloc(void *data, int pflags, const struct mdoc_c
 {
 	struct mdoc	*p;
 
-	if (NULL == (p = calloc(1, sizeof(struct mdoc))))
-		return(NULL);
+	p = mandoc_calloc(1, sizeof(struct mdoc));
+
 	if (cb)
-		(void)memcpy(&p->cb, cb, sizeof(struct mdoc_cb));
+		memcpy(&p->cb, cb, sizeof(struct mdoc_cb));
 
 	p->data = data;
 	p->pflags = pflags;
 
-	if (NULL == (p->htab = mdoc_hash_alloc())) {
-		free(p);
-		return(NULL);
-	} else if (mdoc_alloc1(p))
-		return(p);
-
-	free(p);
-	return(NULL);
+	mdoc_hash_init();
+	mdoc_alloc1(p);
+	return(p);
 }
 
 
@@ -285,17 +282,19 @@ mdoc_endparse(struct mdoc *m)
 
 /*
  * Main parse routine.  Parses a single line -- really just hands off to
- * the macro (parsemacro()) or text parser (parsetext()).
+ * the macro (mdoc_pmacro()) or text parser (mdoc_ptext()).
  */
 int
-mdoc_parseln(struct mdoc *m, int ln, char *buf)
+mdoc_parseln(struct mdoc *m, int ln, char *buf, int offs)
 {
 
 	if (MDOC_HALT & m->flags)
 		return(0);
 
-	return('.' == *buf ? parsemacro(m, ln, buf) :
-			parsetext(m, ln, buf));
+	m->flags |= MDOC_NEWLINE;
+	return(('.' == buf[offs] || '\'' == buf[offs]) ? 
+			mdoc_pmacro(m, ln, buf, offs) :
+			mdoc_ptext(m, ln, buf, offs));
 }
 
 
@@ -350,20 +349,34 @@ mdoc_err(struct mdoc *m, int line, int pos, int iserr,
 
 
 int
-mdoc_macro(struct mdoc *m, int tok, 
+mdoc_macro(struct mdoc *m, enum mdoct tok, 
 		int ln, int pp, int *pos, char *buf)
 {
+	assert(tok < MDOC_MAX);
 
+	/* If we're in the body, deny prologue calls. */
+
 	if (MDOC_PROLOGUE & mdoc_macros[tok].flags && 
 			MDOC_PBODY & m->flags)
 		return(mdoc_perr(m, ln, pp, EPROLBODY));
-	if ( ! (MDOC_PROLOGUE & mdoc_macros[tok].flags) && 
-			! (MDOC_PBODY & m->flags))
-		return(mdoc_perr(m, ln, pp, EBODYPROL));
 
-	if (1 != pp && ! (MDOC_CALLABLE & mdoc_macros[tok].flags))
-		return(mdoc_perr(m, ln, pp, ENOCALL));
+	/* If we're in the prologue, deny "body" macros.  */
 
+	if ( ! (MDOC_PROLOGUE & mdoc_macros[tok].flags) && 
+			! (MDOC_PBODY & m->flags)) {
+		if ( ! mdoc_pwarn(m, ln, pp, EBODYPROL))
+			return(0);
+		if (NULL == m->meta.title)
+			m->meta.title = mandoc_strdup("unknown");
+		if (NULL == m->meta.vol)
+			m->meta.vol = mandoc_strdup("local");
+		if (NULL == m->meta.os)
+			m->meta.os = mandoc_strdup("local");
+		if (0 == m->meta.date)
+			m->meta.date = time(NULL);
+		m->flags |= MDOC_PBODY;
+	}
+
 	return((*mdoc_macros[tok].fp)(m, tok, ln, pp, pos, buf));
 }
 
@@ -433,41 +446,39 @@ node_append(struct mdoc *mdoc, struct mdoc_node *p)
 
 
 static struct mdoc_node *
-node_alloc(struct mdoc *m, int line, 
-		int pos, int tok, enum mdoc_type type)
+node_alloc(struct mdoc *m, int line, int pos, 
+		enum mdoct tok, enum mdoc_type type)
 {
 	struct mdoc_node *p;
 
-	if (NULL == (p = calloc(1, sizeof(struct mdoc_node)))) {
-		(void)mdoc_nerr(m, m->last, EMALLOC);
-		return(NULL);
-	}
-
+	p = mandoc_calloc(1, sizeof(struct mdoc_node));
 	p->sec = m->lastsec;
 	p->line = line;
 	p->pos = pos;
 	p->tok = tok;
-	if (MDOC_TEXT != (p->type = type))
-		assert(p->tok >= 0);
-
+	p->type = type;
+	if (MDOC_NEWLINE & m->flags)
+		p->flags |= MDOC_LINE;
+	m->flags &= ~MDOC_NEWLINE;
 	return(p);
 }
 
 
 int
-mdoc_tail_alloc(struct mdoc *m, int line, int pos, int tok)
+mdoc_tail_alloc(struct mdoc *m, int line, int pos, enum mdoct tok)
 {
 	struct mdoc_node *p;
 
 	p = node_alloc(m, line, pos, tok, MDOC_TAIL);
-	if (NULL == p)
+	if ( ! node_append(m, p))
 		return(0);
-	return(node_append(m, p));
+	m->next = MDOC_NEXT_CHILD;
+	return(1);
 }
 
 
 int
-mdoc_head_alloc(struct mdoc *m, int line, int pos, int tok)
+mdoc_head_alloc(struct mdoc *m, int line, int pos, enum mdoct tok)
 {
 	struct mdoc_node *p;
 
@@ -475,86 +486,80 @@ mdoc_head_alloc(struct mdoc *m, int line, int pos, int
 	assert(m->last);
 
 	p = node_alloc(m, line, pos, tok, MDOC_HEAD);
-	if (NULL == p)
+	if ( ! node_append(m, p))
 		return(0);
-	return(node_append(m, p));
+	m->next = MDOC_NEXT_CHILD;
+	return(1);
 }
 
 
 int
-mdoc_body_alloc(struct mdoc *m, int line, int pos, int tok)
+mdoc_body_alloc(struct mdoc *m, int line, int pos, enum mdoct tok)
 {
 	struct mdoc_node *p;
 
 	p = node_alloc(m, line, pos, tok, MDOC_BODY);
-	if (NULL == p)
+	if ( ! node_append(m, p))
 		return(0);
-	return(node_append(m, p));
+	m->next = MDOC_NEXT_CHILD;
+	return(1);
 }
 
 
 int
 mdoc_block_alloc(struct mdoc *m, int line, int pos, 
-		int tok, struct mdoc_arg *args)
+		enum mdoct tok, struct mdoc_arg *args)
 {
 	struct mdoc_node *p;
 
 	p = node_alloc(m, line, pos, tok, MDOC_BLOCK);
-	if (NULL == p)
-		return(0);
 	p->args = args;
 	if (p->args)
 		(args->refcnt)++;
-	return(node_append(m, p));
+	if ( ! node_append(m, p))
+		return(0);
+	m->next = MDOC_NEXT_CHILD;
+	return(1);
 }
 
 
 int
 mdoc_elem_alloc(struct mdoc *m, int line, int pos, 
-		int tok, struct mdoc_arg *args)
+		enum mdoct tok, struct mdoc_arg *args)
 {
 	struct mdoc_node *p;
 
 	p = node_alloc(m, line, pos, tok, MDOC_ELEM);
-	if (NULL == p)
-		return(0);
 	p->args = args;
 	if (p->args)
 		(args->refcnt)++;
-	return(node_append(m, p));
+	if ( ! node_append(m, p))
+		return(0);
+	m->next = MDOC_NEXT_CHILD;
+	return(1);
 }
 
 
-static int
-pstring(struct mdoc *m, int line, int pos, const char *p, size_t len)
+int
+mdoc_word_alloc(struct mdoc *m, int line, int pos, const char *p)
 {
 	struct mdoc_node *n;
-	size_t		  sv;
+	size_t		  sv, len;
 
-	n = node_alloc(m, line, pos, -1, MDOC_TEXT);
-	if (NULL == n)
-		return(mdoc_nerr(m, m->last, EMALLOC));
+	len = strlen(p);
 
-	n->string = malloc(len + 1);
-	if (NULL == n->string) {
-		free(n);
-		return(mdoc_nerr(m, m->last, EMALLOC));
-	}
-
+	n = node_alloc(m, line, pos, MDOC_MAX, MDOC_TEXT);
+	n->string = mandoc_malloc(len + 1);
 	sv = strlcpy(n->string, p, len + 1);
 
 	/* Prohibit truncation. */
 	assert(sv < len + 1);
 
-	return(node_append(m, n));
-}
+	if ( ! node_append(m, n))
+		return(0);
 
-
-int
-mdoc_word_alloc(struct mdoc *m, int line, int pos, const char *p)
-{
-
-	return(pstring(m, line, pos, p, strlen(p)));
+	m->next = MDOC_NEXT_SIBLING;
+	return(1);
 }
 
 
@@ -562,8 +567,6 @@ void
 mdoc_node_free(struct mdoc_node *p)
 {
 
-	if (p->parent)
-		p->parent->nchild--;
 	if (p->string)
 		free(p->string);
 	if (p->args)
@@ -572,16 +575,53 @@ mdoc_node_free(struct mdoc_node *p)
 }
 
 
-void
-mdoc_node_freelist(struct mdoc_node *p)
+static void
+mdoc_node_unlink(struct mdoc *m, struct mdoc_node *n)
 {
 
-	if (p->child)
-		mdoc_node_freelist(p->child);
-	if (p->next)
-		mdoc_node_freelist(p->next);
+	/* Adjust siblings. */
 
+	if (n->prev)
+		n->prev->next = n->next;
+	if (n->next)
+		n->next->prev = n->prev;
+
+	/* Adjust parent. */
+
+	if (n->parent) {
+		n->parent->nchild--;
+		if (n->parent->child == n)
+			n->parent->child = n->prev ? n->prev : n->next;
+	}
+
+	/* Adjust parse point, if applicable. */
+
+	if (m && m->last == n) {
+		if (n->prev) {
+			m->last = n->prev;
+			m->next = MDOC_NEXT_SIBLING;
+		} else {
+			m->last = n->parent;
+			m->next = MDOC_NEXT_CHILD;
+		}
+	}
+
+	if (m && m->first == n)
+		m->first = NULL;
+}
+
+
+void
+mdoc_node_delete(struct mdoc *m, struct mdoc_node *p)
+{
+
+	while (p->child) {
+		assert(p->nchild);
+		mdoc_node_delete(m, p->child);
+	}
 	assert(0 == p->nchild);
+
+	mdoc_node_unlink(m, p);
 	mdoc_node_free(p);
 }
 
@@ -591,76 +631,96 @@ mdoc_node_freelist(struct mdoc_node *p)
  * control character.
  */
 static int
-parsetext(struct mdoc *m, int line, char *buf)
+mdoc_ptext(struct mdoc *m, int line, char *buf, int offs)
 {
-	int		 i, j;
+	int		 i;
 
+	/* Ignore bogus comments. */
+
+	if ('\\' == buf[offs] && 
+			'.' == buf[offs + 1] && 
+			'"' == buf[offs + 2])
+		return(mdoc_pwarn(m, line, offs, EBADCOMMENT));
+
+	/* No text before an initial macro. */
+
 	if (SEC_NONE == m->lastnamed)
-		return(mdoc_perr(m, line, 0, ETEXTPROL));
+		return(mdoc_perr(m, line, offs, ETEXTPROL));
+
+	/* Literal just gets pulled in as-is. */
 	
-	/*
-	 * If in literal mode, then pass the buffer directly to the
-	 * back-end, as it should be preserved as a single term.
-	 */
+	if (MDOC_LITERAL & m->flags)
+		return(mdoc_word_alloc(m, line, offs, buf + offs));
 
-	if (MDOC_LITERAL & m->flags) {
-		if ( ! mdoc_word_alloc(m, line, 0, buf))
+	/* Check for a blank line, which may also consist of spaces. */
+
+	for (i = offs; ' ' == buf[i]; i++)
+		/* Skip to first non-space. */ ;
+
+	if ('\0' == buf[i]) {
+		if ( ! mdoc_pwarn(m, line, offs, ENOBLANK))
 			return(0);
+
+		/*
+		 * Insert a `Pp' in the case of a blank line.  Technically,
+		 * blank lines aren't allowed, but enough manuals assume this
+		 * behaviour that we want to work around it.
+		 */
+		if ( ! mdoc_elem_alloc(m, line, offs, MDOC_Pp, NULL))
+			return(0);
+
 		m->next = MDOC_NEXT_SIBLING;
 		return(1);
 	}
 
-	/* Disallow blank/white-space lines in non-literal mode. */
-
-	for (i = 0; ' ' == buf[i]; i++)
-		/* Skip leading whitespace. */ ;
-	if (0 == buf[i])
-		return(mdoc_perr(m, line, 0, ENOBLANK));
-
-	/*
-	 * Break apart a free-form line into tokens.  Spaces are
-	 * stripped out of the input.
+	/* 
+	 * Warn if the last un-escaped character is whitespace. Then
+	 * strip away the remaining spaces (tabs stay!).   
 	 */
 
-	for (j = i; buf[i]; i++) {
-		if (' ' != buf[i])
-			continue;
+	i = (int)strlen(buf);
+	assert(i);
 
-		/* Escaped whitespace. */
-		if (i && ' ' == buf[i] && '\\' == buf[i - 1])
-			continue;
+	if (' ' == buf[i - 1] || '\t' == buf[i - 1]) {
+		if (i > 1 && '\\' != buf[i - 2])
+			if ( ! mdoc_pwarn(m, line, i - 1, ETAILWS))
+				return(0);
 
-		buf[i++] = 0;
-		if ( ! pstring(m, line, j, &buf[j], (size_t)(i - j)))
-			return(0);
-		m->next = MDOC_NEXT_SIBLING;
+		for (--i; i && ' ' == buf[i]; i--)
+			/* Spin back to non-space. */ ;
 
-		for ( ; ' ' == buf[i]; i++)
-			/* Skip trailing whitespace. */ ;
+		/* Jump ahead of escaped whitespace. */
+		i += '\\' == buf[i] ? 2 : 1;
 
-		j = i;
-		if (0 == buf[i])
-			break;
+		buf[i] = '\0';
 	}
 
-	if (j != i && ! pstring(m, line, j, &buf[j], (size_t)(i - j)))
+	/* Allocate the whole word. */
+
+	if ( ! mdoc_word_alloc(m, line, offs, buf + offs))
 		return(0);
 
-	m->next = MDOC_NEXT_SIBLING;
+	/*
+	 * End-of-sentence check.  If the last character is an unescaped
+	 * EOS character, then flag the node as being the end of a
+	 * sentence.  The front-end will know how to interpret this.
+	 */
+
+	assert(i);
+	if (mandoc_eos(buf, (size_t)i))
+		m->last->flags |= MDOC_EOS;
+
 	return(1);
 }
 
 
-
-
 static int
-macrowarn(struct mdoc *m, int ln, const char *buf)
+macrowarn(struct mdoc *m, int ln, const char *buf, int offs)
 {
 	if ( ! (MDOC_IGN_MACRO & m->pflags))
-		return(mdoc_verr(m, ln, 0, 
-				"unknown macro: %s%s", 
+		return(mdoc_verr(m, ln, offs, "unknown macro: %s%s", 
 				buf, strlen(buf) > 3 ? "..." : ""));
-	return(mdoc_vwarn(m, ln, 0, "unknown macro: %s%s",
+	return(mdoc_vwarn(m, ln, offs, "unknown macro: %s%s",
 				buf, strlen(buf) > 3 ? "..." : ""));
 }
 
@@ -670,44 +730,58 @@ macrowarn(struct mdoc *m, int ln, const char *buf)
  * character.
  */
 int
-parsemacro(struct mdoc *m, int ln, char *buf)
+mdoc_pmacro(struct mdoc *m, int ln, char *buf, int offs)
 {
-	int		  i, c;
-	char		  mac[5];
+	enum mdoct	tok;
+	int		i, j, sv;
+	char		mac[5];
 
 	/* Empty lines are ignored. */
 
-	if (0 == buf[1])
+	offs++;
+
+	if ('\0' == buf[offs])
 		return(1);
 
-	if (' ' == buf[1]) {
-		i = 2;
+	i = offs;
+
+	/* Accept whitespace after the initial control char. */
+
+	if (' ' == buf[i]) {
+		i++;
 		while (buf[i] && ' ' == buf[i])
 			i++;
-		if (0 == buf[i])
+		if ('\0' == buf[i])
 			return(1);
-		return(mdoc_perr(m, ln, 1, ESPACE));
 	}
 
+	sv = i;
+
 	/* Copy the first word into a nil-terminated buffer. */
 
-	for (i = 1; i < 5; i++) {
-		if (0 == (mac[i - 1] = buf[i]))
+	for (j = 0; j < 4; j++, i++) {
+		if ('\0' == (mac[j] = buf[i]))
 			break;
 		else if (' ' == buf[i])
 			break;
+
+		/* Check for invalid characters. */
+
+		if (isgraph((u_char)buf[i]))
+			continue;
+		return(mdoc_perr(m, ln, i, EPRINT));
 	}
 
-	mac[i - 1] = 0;
+	mac[j] = '\0';
 
-	if (i == 5 || i <= 2) {
-		if ( ! macrowarn(m, ln, mac))
+	if (j == 4 || j < 2) {
+		if ( ! macrowarn(m, ln, mac, sv))
 			goto err;
 		return(1);
 	} 
 	
-	if (MDOC_MAX == (c = mdoc_hash_find(m->htab, mac))) {
-		if ( ! macrowarn(m, ln, mac))
+	if (MDOC_MAX == (tok = mdoc_hash_find(mac))) {
+		if ( ! macrowarn(m, ln, mac, sv))
 			goto err;
 		return(1);
 	}
@@ -717,9 +791,20 @@ parsemacro(struct mdoc *m, int ln, char *buf)
 	while (buf[i] && ' ' == buf[i])
 		i++;
 
-	/* Begin recursive parse sequence. */
+	/* 
+	 * Trailing whitespace.  Note that tabs are allowed to be passed
+	 * into the parser as "text", so we only warn about spaces here.
+	 */
 
-	if ( ! mdoc_macro(m, c, ln, 1, &i, buf)) 
+	if ('\0' == buf[i] && ' ' == buf[i - 1])
+		if ( ! mdoc_pwarn(m, ln, i - 1, ETAILWS))
+			goto err;
+
+	/* 
+	 * Begin recursive parse sequence.  Since we're at the start of
+	 * the line, we don't need to do callable/parseable checks.
+	 */
+	if ( ! mdoc_macro(m, tok, ln, sv, &i, buf)) 
 		goto err;
 
 	return(1);
@@ -729,3 +814,5 @@ err:	/* Error out. */
 	m->flags |= MDOC_HALT;
 	return(0);
 }
+
+