Fixed re-adjustment of scope in exiting roff instructions (libman).

[mandoc.git] / man.c

diff --git a/man.c b/man.c
index d424570f35c2e6e778caea49793690c8b84aa96d..9dceb79010846daa29cbb61e48f00a73fd51bd22 100644 (file)
--- a/man.c
+++ b/man.c
@@ -1,48 +1,90 @@
-/* $Id: man.c,v 1.10 2009/03/26 11:16:21 kristaps Exp $ */
+/*     $Id: man.c,v 1.55 2010/03/27 10:04:56 kristaps Exp $ */

 /*
 /*

- * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@openbsd.org>
+ * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@kth.se>

  *
  * Permission to use, copy, modify, and distribute this software for any
  *
  * 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.
+ * 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.
+ * 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 <sys/types.h>
+

 #include <assert.h>
 #include <ctype.h>
 #include <assert.h>
 #include <ctype.h>

-#include <err.h>

 #include <stdarg.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
 
 #include "libman.h"
 #include <stdarg.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
 
 #include "libman.h"

+#include "libmandoc.h"
+
+const  char *const __man_merrnames[WERRMAX] = {                 
+       "invalid character", /* WNPRINT */
+       "invalid manual section", /* WMSEC */
+       "invalid date format", /* WDATE */
+       "scope of prior line violated", /* WLNSCOPE */
+       "over-zealous prior line scope violation", /* WLNSCOPE2 */
+       "trailing whitespace", /* WTSPACE */
+       "unterminated quoted parameter", /* WTQUOTE */
+       "document has no body", /* WNODATA */
+       "document has no title/section", /* WNOTITLE */
+       "invalid escape sequence", /* WESCAPE */
+       "invalid number format", /* WNUMFMT */
+       "expected block head arguments", /* WHEADARGS */
+       "expected block body arguments", /* WBODYARGS */
+       "expected empty block head", /* WNHEADARGS */
+       "ill-formed macro", /* WMACROFORM */
+       "scope open on exit", /* WEXITSCOPE */
+       "no scope context", /* WNOSCOPE */
+       "literal context already open", /* WOLITERAL */
+       "no literal context open", /* WNLITERAL */
+       "invalid nesting of roff declarations", /* WROFFNEST */
+       "scope in roff instructions broken", /* WROFFSCOPE */
+       "document title should be uppercase", /* WTITLECASE */
+};

 
 const  char *const __man_macronames[MAN_MAX] = {                
 
 const  char *const __man_macronames[MAN_MAX] = {                

-       "\\\"",         "TH",           "SH",           "SS",
+       "br",           "TH",           "SH",           "SS",

        "TP",           "LP",           "PP",           "P",
        "IP",           "HP",           "SM",           "SB",
        "BI",           "IB",           "BR",           "RB",
        "TP",           "LP",           "PP",           "P",
        "IP",           "HP",           "SM",           "SB",
        "BI",           "IB",           "BR",           "RB",

-       "R",            "B",            "I",            "IR"
+       "R",            "B",            "I",            "IR",
+       "RI",           "na",           "i",            "sp",
+       "nf",           "fi",           "r",            "RE",
+       "RS",           "DT",           "UC",           "PD",
+       "Sp",           "Vb",           "Ve",           "de",
+       "dei",          "am",           "ami",          "ig",
+       ".",

        };
 
 const  char * const *man_macronames = __man_macronames;
 
        };
 
 const  char * const *man_macronames = __man_macronames;
 

-static struct man_node *man_node_alloc(int, int, enum man_type);
+static struct man_node *man_node_alloc(int, int, 
+                               enum man_type, enum mant);

 static int              man_node_append(struct man *, 
                                struct man_node *);
 static int              man_node_append(struct man *, 
                                struct man_node *);

+static void             man_node_free(struct man_node *);
+static void             man_node_unlink(struct man *, 
+                               struct man_node *);

 static int              man_ptext(struct man *, int, char *);
 static int              man_pmacro(struct man *, int, char *);
 static void             man_free1(struct man *);
 static void             man_alloc1(struct man *);
 static int              man_ptext(struct man *, int, char *);
 static int              man_pmacro(struct man *, int, char *);
 static void             man_free1(struct man *);
 static void             man_alloc1(struct man *);

+static int              pstring(struct man *, int, int, 
+                               const char *, size_t);
+static int              macrowarn(struct man *, int, const char *);

 
 
 const struct man_node *
 
 
 const struct man_node *


@@ -75,9 +117,6 @@ man_free(struct man *man)
 {
 
        man_free1(man);
 {
 
        man_free1(man);

-
-       if (man->htab)
-               man_hash_free(man->htab);

        free(man);
 }
 
        free(man);
 }
 


@@ -87,19 +126,16 @@ man_alloc(void *data, int pflags, const struct man_cb *cb)
 {
        struct man      *p;
 
 {
        struct man      *p;
 

-       p = calloc(1, sizeof(struct man));
-       if (NULL == p)
-               err(1, "calloc");
-
-       man_alloc1(p);
+       p = mandoc_calloc(1, sizeof(struct man));

 
        if (cb)
 
        if (cb)

-               (void)memcpy(&p->cb, cb, sizeof(struct man_cb));
+               memcpy(&p->cb, cb, sizeof(struct man_cb));

 
 

-       p->htab = man_hash_alloc();
+       man_hash_init();

        p->data = data;
        p->pflags = pflags;
 
        p->data = data;
        p->pflags = pflags;
 

+       man_alloc1(p);

        return(p);
 }
 
        return(p);
 }
 


@@ -121,7 +157,7 @@ int
 man_parseln(struct man *m, int ln, char *buf)
 {
 
 man_parseln(struct man *m, int ln, char *buf)
 {
 

-       return('.' == *buf ? 
+       return('.' == *buf || '\'' == *buf ? 

                        man_pmacro(m, ln, buf) : 
                        man_ptext(m, ln, buf));
 }
                        man_pmacro(m, ln, buf) : 
                        man_ptext(m, ln, buf));
 }


@@ -132,7 +168,7 @@ man_free1(struct man *man)
 {
 
        if (man->first)
 {
 
        if (man->first)

-               man_node_freelist(man->first);
+               man_node_delete(man, man->first);

        if (man->meta.title)
                free(man->meta.title);
        if (man->meta.source)
        if (man->meta.title)
                free(man->meta.title);
        if (man->meta.source)


@@ -146,13 +182,12 @@ static void
 man_alloc1(struct man *m)
 {
 
 man_alloc1(struct man *m)
 {
 

-       bzero(&m->meta, sizeof(struct man_meta));
+       memset(&m->meta, 0, sizeof(struct man_meta));

        m->flags = 0;
        m->flags = 0;

-       m->last = calloc(1, sizeof(struct man_node));
-       if (NULL == m->last)
-               err(1, "calloc");
+       m->last = mandoc_calloc(1, sizeof(struct man_node));

        m->first = m->last;
        m->last->type = MAN_ROOT;
        m->first = m->last;
        m->last->type = MAN_ROOT;

+       m->last->tok = MAN_MAX;

        m->next = MAN_NEXT_CHILD;
 }
 
        m->next = MAN_NEXT_CHILD;
 }
 


@@ -179,6 +214,25 @@ man_node_append(struct man *man, struct man_node *p)
                abort();
                /* NOTREACHED */
        }
                abort();
                /* NOTREACHED */
        }

+       
+       assert(p->parent);
+       p->parent->nchild++;
+
+       if ( ! man_valid_pre(man, p))
+               return(0);
+
+       switch (p->type) {
+       case (MAN_HEAD):
+               assert(MAN_BLOCK == p->parent->type);
+               p->parent->head = p;
+               break;
+       case (MAN_BODY):
+               assert(MAN_BLOCK == p->parent->type);
+               p->parent->body = p;
+               break;
+       default:
+               break;
+       }

 
        man->last = p;
 
 
        man->last = p;
 


@@ -198,47 +252,105 @@ man_node_append(struct man *man, struct man_node *p)
 
 
 static struct man_node *
 
 
 static struct man_node *

-man_node_alloc(int line, int pos, enum man_type type)
+man_node_alloc(int line, int pos, enum man_type type, enum mant tok)

 {
        struct man_node *p;
 
 {
        struct man_node *p;
 

-       if (NULL == (p = calloc(1, sizeof(struct man_node))))
-               err(1, "malloc");
+       p = mandoc_calloc(1, sizeof(struct man_node));

        p->line = line;
        p->pos = pos;
        p->type = type;
        p->line = line;
        p->pos = pos;
        p->type = type;

-
+       p->tok = tok;

        return(p);
 }
 
 
 int
        return(p);
 }
 
 
 int

-man_elem_alloc(struct man *man, int line, int pos, int tok)
+man_elem_alloc(struct man *m, int line, int pos, enum mant tok)

 {
        struct man_node *p;
 
 {
        struct man_node *p;
 

-       p = man_node_alloc(line, pos, MAN_ELEM);
-       p->tok = tok;
+       p = man_node_alloc(line, pos, MAN_ELEM, tok);
+       if ( ! man_node_append(m, p))
+               return(0);
+       m->next = MAN_NEXT_CHILD;
+       return(1);
+}
+
+
+int
+man_head_alloc(struct man *m, int line, int pos, enum mant tok)
+{
+       struct man_node *p;
+
+       p = man_node_alloc(line, pos, MAN_HEAD, tok);
+       if ( ! man_node_append(m, p))
+               return(0);
+       m->next = MAN_NEXT_CHILD;
+       return(1);
+}
+
+
+int
+man_body_alloc(struct man *m, int line, int pos, enum mant tok)
+{
+       struct man_node *p;

 
 

-       return(man_node_append(man, p));
+       p = man_node_alloc(line, pos, MAN_BODY, tok);
+       if ( ! man_node_append(m, p))
+               return(0);
+       m->next = MAN_NEXT_CHILD;
+       return(1);

 }
 
 
 int
 }
 
 
 int

-man_word_alloc(struct man *man, 
-               int line, int pos, const char *word)
+man_block_alloc(struct man *m, int line, int pos, enum mant tok)
+{
+       struct man_node *p;
+
+       p = man_node_alloc(line, pos, MAN_BLOCK, tok);
+       if ( ! man_node_append(m, p))
+               return(0);
+       m->next = MAN_NEXT_CHILD;
+       return(1);
+}
+
+
+static int
+pstring(struct man *m, int line, int pos, 
+               const char *p, size_t len)

 {
 {

-       struct man_node *p;
+       struct man_node *n;
+       size_t           sv;

 
 

-       p = man_node_alloc(line, pos, MAN_TEXT);
-       if (NULL == (p->string = strdup(word)))
-               err(1, "strdup");
+       n = man_node_alloc(line, pos, MAN_TEXT, MAN_MAX);
+       n->string = mandoc_malloc(len + 1);
+       sv = strlcpy(n->string, p, len + 1);

 
 

-       return(man_node_append(man, p));
+       /* Prohibit truncation. */
+       assert(sv < len + 1);
+
+       if ( ! man_node_append(m, n))
+               return(0);
+       m->next = MAN_NEXT_SIBLING;
+       return(1);

 }
 
 
 }
 
 

-void
+int
+man_word_alloc(struct man *m, int line, int pos, const char *word)
+{
+
+       return(pstring(m, line, pos, word, strlen(word)));
+}
+
+
+/*
+ * Free all of the resources held by a node.  This does NOT unlink a
+ * node from its context; for that, see man_node_unlink().
+ */
+static void

 man_node_free(struct man_node *p)
 {
 
 man_node_free(struct man_node *p)
 {
 


@@ -249,14 +361,13 @@ man_node_free(struct man_node *p)
 
 
 void
 
 
 void

-man_node_freelist(struct man_node *p)
+man_node_delete(struct man *m, struct man_node *p)

 {
 
 {
 

-       if (p->child)
-               man_node_freelist(p->child);
-       if (p->next)
-               man_node_freelist(p->next);
+       while (p->child)
+               man_node_delete(m, p->child);

 
 

+       man_node_unlink(m, p);

        man_node_free(p);
 }
 
        man_node_free(p);
 }
 


@@ -264,23 +375,119 @@ man_node_freelist(struct man_node *p)
 static int
 man_ptext(struct man *m, int line, char *buf)
 {
 static int
 man_ptext(struct man *m, int line, char *buf)
 {

+       int              i, j;
+       char             sv;
+
+       /* Literal free-form text whitespace is preserved. */
+
+       if (MAN_LITERAL & m->flags) {
+               if ( ! man_word_alloc(m, line, 0, buf))
+                       return(0);
+               goto descope;
+       }
+
+       /* First de-chunk and allocate words. */
+
+       for (i = 0; ' ' == buf[i]; i++)
+               /* Skip leading whitespace. */ ;
+
+       if ('\0' == buf[i]) {
+               /* Trailing whitespace? */
+               if (i && ' ' == buf[i - 1])
+                       if ( ! man_pwarn(m, line, i - 1, WTSPACE))
+                               return(0);
+               if ( ! pstring(m, line, 0, &buf[i], 0))
+                       return(0);
+               goto descope;
+       }
+
+       for (j = i; buf[i]; i++) {
+               if (' ' != buf[i])
+                       continue;
+
+               /* Escaped whitespace. */
+               if (i && ' ' == buf[i] && '\\' == buf[i - 1])
+                       continue;
+
+               sv = buf[i];
+               buf[i++] = '\0';

 
 

-       if ( ! man_word_alloc(m, line, 0, buf))
+               if ( ! pstring(m, line, j, &buf[j], (size_t)(i - j)))
+                       return(0);
+
+               /* Trailing whitespace?  Check at overwritten byte. */
+
+               if (' ' == sv && '\0' == buf[i])
+                       if ( ! man_pwarn(m, line, i - 1, WTSPACE))
+                               return(0);
+
+               for ( ; ' ' == buf[i]; i++)
+                       /* Skip trailing whitespace. */ ;
+
+               j = i;
+
+               /* Trailing whitespace? */
+
+               if (' ' == buf[i - 1] && '\0' == buf[i])
+                       if ( ! man_pwarn(m, line, i - 1, WTSPACE))
+                               return(0);
+
+               if ('\0' == buf[i])
+                       break;
+       }
+
+       if (j != i && ! pstring(m, line, j, &buf[j], (size_t)(i - j)))

                return(0);
                return(0);

-       m->next = MAN_NEXT_SIBLING;
-       return(1);
+
+descope:
+
+       /*
+        * Co-ordinate what happens with having a next-line scope open:
+        * first close out the element scope (if applicable), then close
+        * out the block scope (also if applicable).
+        */
+
+       if (MAN_ELINE & m->flags) {
+               m->flags &= ~MAN_ELINE;
+               if ( ! man_unscope(m, m->last->parent, WERRMAX))
+                       return(0);
+       }
+
+       if ( ! (MAN_BLINE & m->flags))
+               return(1);
+       m->flags &= ~MAN_BLINE;
+
+       if ( ! man_unscope(m, m->last->parent, WERRMAX))
+               return(0);
+       return(man_body_alloc(m, line, 0, m->last->tok));
+}
+
+
+static int
+macrowarn(struct man *m, int ln, const char *buf)
+{
+       if ( ! (MAN_IGN_MACRO & m->pflags))
+               return(man_verr(m, ln, 0, 
+                               "unknown macro: %s%s", 
+                               buf, strlen(buf) > 3 ? "..." : ""));
+       return(man_vwarn(m, ln, 0, "unknown macro: %s%s",
+                               buf, strlen(buf) > 3 ? "..." : ""));

 }
 
 
 int
 man_pmacro(struct man *m, int ln, char *buf)
 {
 }
 
 
 int
 man_pmacro(struct man *m, int ln, char *buf)
 {

-       int               i, j, c, ppos;
-       char              mac[5];
+       int              i, j, ppos, fl;
+       enum mant        tok;
+       char             mac[5];
+       struct man_node *n;

 
        /* Comments and empties are quickly ignored. */
 
 
        /* Comments and empties are quickly ignored. */
 

-       if (0 == buf[1])
+       fl = m->flags;
+
+       if ('\0' == buf[1])

                return(1);
 
        i = 1;
                return(1);
 
        i = 1;


@@ -289,47 +496,41 @@ man_pmacro(struct man *m, int ln, char *buf)
                i++;
                while (buf[i] && ' ' == buf[i])
                        i++;
                i++;
                while (buf[i] && ' ' == buf[i])
                        i++;

-               if (0 == buf[i])
-                       return(1);
+               if ('\0' == buf[i])
+                       goto out;

        }
 
        ppos = i;
 
        }
 
        ppos = i;
 

-       if (buf[i] && '\\' == buf[i])
-               if (buf[i + 1] && '\"' == buf[i + 1])
-                       return(1);
-

        /* Copy the first word into a nil-terminated buffer. */
 
        for (j = 0; j < 4; j++, i++) {
        /* Copy the first word into a nil-terminated buffer. */
 
        for (j = 0; j < 4; j++, i++) {

-               if (0 == (mac[j] = buf[i]))
+               if ('\0' == (mac[j] = buf[i]))

                        break;
                else if (' ' == buf[i])
                        break;
                        break;
                else if (' ' == buf[i])
                        break;

+
+               /* Check for invalid characters. */
+
+               if (isgraph((u_char)buf[i]))
+                       continue;
+               return(man_perr(m, ln, i, WNPRINT));

        }
 
        }
 

-       mac[j] = 0;
+       mac[j] = '\0';

 
        if (j == 4 || j < 1) {
                if ( ! (MAN_IGN_MACRO & m->pflags)) {
 
        if (j == 4 || j < 1) {
                if ( ! (MAN_IGN_MACRO & m->pflags)) {

-                       (void)man_verr(m, ln, ppos, 
-                               "ill-formed macro: %s", mac);
+                       (void)man_perr(m, ln, ppos, WMACROFORM);

                        goto err;
                } 
                        goto err;
                } 

-               if ( ! man_vwarn(m, ln, ppos, 
-                               "ill-formed macro: %s", mac))
+               if ( ! man_pwarn(m, ln, ppos, WMACROFORM))

                        goto err;
                return(1);
        }
        
                        goto err;
                return(1);
        }
        

-       if (MAN_MAX == (c = man_hash_find(m->htab, mac))) {
-               if ( ! (MAN_IGN_MACRO & m->pflags)) {
-                       (void)man_verr(m, ln, ppos, 
-                               "unknown macro: %s", mac);
-                       goto err;
-               } 
-               if ( ! man_vwarn(m, ln, ppos, 
-                               "unknown macro: %s", mac))
+       if (MAN_MAX == (tok = man_hash_find(mac))) {
+               if ( ! macrowarn(m, ln, mac))

                        goto err;
                return(1);
        }
                        goto err;
                return(1);
        }


@@ -339,12 +540,94 @@ man_pmacro(struct man *m, int ln, char *buf)
        while (buf[i] && ' ' == buf[i])
                i++;
 
        while (buf[i] && ' ' == buf[i])
                i++;
 

+       /* Trailing whitespace? */
+
+       if ('\0' == buf[i] && ' ' == buf[i - 1])
+               if ( ! man_pwarn(m, ln, i - 1, WTSPACE))
+                       goto err;
+
+       /* 
+        * Remove prior ELINE macro, as it's being clobbering by a new
+        * macro.  Note that NSCOPED macros do not close out ELINE
+        * macros---they don't print text---so we let those slip by.
+        */
+
+       if ( ! (MAN_NSCOPED & man_macros[tok].flags) &&
+                       m->flags & MAN_ELINE) {
+               assert(MAN_TEXT != m->last->type);
+
+               /*
+                * This occurs in the following construction:
+                *   .B
+                *   .br
+                *   .B
+                *   .br
+                *   I hate man macros.
+                * Flat-out disallow this madness.
+                */
+               if (MAN_NSCOPED & man_macros[m->last->tok].flags)
+                       return(man_perr(m, ln, ppos, WLNSCOPE));
+
+               n = m->last;
+
+               assert(n);
+               assert(NULL == n->child);
+               assert(0 == n->nchild);
+
+               if ( ! man_nwarn(m, n, WLNSCOPE))
+                       return(0);
+
+               man_node_delete(m, n);
+               m->flags &= ~MAN_ELINE;
+       }
+

        /* Begin recursive parse sequence. */
 
        /* Begin recursive parse sequence. */
 

-       if ( ! man_macro(m, c, ln, ppos, &i, buf))
+       assert(man_macros[tok].fp);
+
+       if ( ! (*man_macros[tok].fp)(m, tok, ln, ppos, &i, buf))

                goto err;
 
                goto err;
 

-       return(1);
+out:
+       /* 
+        * We weren't in a block-line scope when entering the
+        * above-parsed macro, so return.
+        *
+        * FIXME: this prohibits the nesting of blocks (e.g., `de' and
+        * family) within BLINE or ELINE systems.  This is annoying.
+        */
+
+       if ( ! (MAN_BLINE & fl)) {
+               m->flags &= ~MAN_ILINE; 
+               return(1);
+       }
+
+       /*
+        * If we're in a block scope, then allow this macro to slip by
+        * without closing scope around it.
+        */
+
+       if (MAN_ILINE & m->flags) {
+               m->flags &= ~MAN_ILINE;
+               return(1);
+       }
+
+       /* 
+        * If we've opened a new next-line element scope, then return
+        * now, as the next line will close out the block scope.
+        */
+
+       if (MAN_ELINE & m->flags)
+               return(1);
+
+       /* Close out the block scope opened in the prior line.  */
+
+       assert(MAN_BLINE & m->flags);
+       m->flags &= ~MAN_BLINE;
+
+       if ( ! man_unscope(m, m->last->parent, WERRMAX))
+               return(0);
+       return(man_body_alloc(m, ln, 0, m->last->tok));

 
 err:   /* Error out. */
 
 
 err:   /* Error out. */
 


@@ -385,3 +668,58 @@ man_vwarn(struct man *man, int ln, int pos, const char *fmt, ...)
 }
 
 
 }
 
 

+int
+man_err(struct man *m, int line, int pos, int iserr, enum merr type)
+{
+       const char       *p;
+       
+       p = __man_merrnames[(int)type];
+       assert(p);
+
+       if (iserr)
+               return(man_verr(m, line, pos, p));
+
+       return(man_vwarn(m, line, pos, p));
+}
+
+
+/*
+ * Unlink a node from its context.  If "m" is provided, the last parse
+ * point will also be adjusted accordingly.
+ */
+static void
+man_node_unlink(struct man *m, struct man_node *n)
+{
+
+       /* 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) {
+               /*XXX: this can occur when bailing from validation. */
+               /*assert(NULL == n->next);*/
+               if (n->prev) {
+                       m->last = n->prev;
+                       m->next = MAN_NEXT_SIBLING;
+               } else {
+                       m->last = n->parent;
+                       m->next = MAN_NEXT_CHILD;
+               }
+       }
+
+       if (m && m->first == n)
+               m->first = NULL;
+}