POSIX allows PATH_MAX to not be defined, meaning "unlimited".

[mandoc.git] / mansearch.c

diff --git a/mansearch.c b/mansearch.c
index fb2de0094711c734feb4fc2eae484c07016232f6..30e7768b48bcdc4f12e445adad2e76c492e6887c 100644 (file)
--- a/mansearch.c
+++ b/mansearch.c
@@ -1,28 +1,30 @@
-/*     $Id: mansearch.c,v 1.34 2014/04/20 16:46:05 schwarze Exp $ */
+/*     $OpenBSD: mansearch.c,v 1.50 2016/07/09 15:23:36 schwarze Exp $ */

 /*
  * Copyright (c) 2012 Kristaps Dzonsons <kristaps@bsd.lv>
 /*
  * Copyright (c) 2012 Kristaps Dzonsons <kristaps@bsd.lv>

- * Copyright (c) 2013, 2014 Ingo Schwarze <schwarze@openbsd.org>
+ * Copyright (c) 2013, 2014, 2015, 2016 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.
  *
  *
  * 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
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES

  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS 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.
  */
  * 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"
 #include "config.h"

-#endif

 
 #include <sys/mman.h>
 
 #include <sys/mman.h>

+#include <sys/types.h>
+

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

+#include <err.h>
+#include <errno.h>

 #include <fcntl.h>
 #include <fcntl.h>

-#include <getopt.h>
+#include <glob.h>

 #include <limits.h>
 #include <regex.h>
 #include <stdio.h>
 #include <limits.h>
 #include <regex.h>
 #include <stdio.h>


@@ -32,193 +34,98 @@
 #include <string.h>
 #include <unistd.h>
 
 #include <string.h>
 #include <unistd.h>
 

-#ifdef HAVE_OHASH
-#include <ohash.h>
-#else
-#include "compat_ohash.h"
-#endif
-#include <sqlite3.h>
-

 #include "mandoc.h"
 #include "mandoc_aux.h"
 #include "mandoc.h"
 #include "mandoc_aux.h"

-#include "manpath.h"
+#include "mandoc_ohash.h"
+#include "manconf.h"

 #include "mansearch.h"
 #include "mansearch.h"

-
-extern int mansearch_keymax;
-extern const char *const mansearch_keynames[];
-
-#define        SQL_BIND_TEXT(_db, _s, _i, _v) \
-       do { if (SQLITE_OK != sqlite3_bind_text \
-               ((_s), (_i)++, (_v), -1, SQLITE_STATIC)) \
-               fprintf(stderr, "%s\n", sqlite3_errmsg((_db))); \
-       } while (0)
-#define        SQL_BIND_INT64(_db, _s, _i, _v) \
-       do { if (SQLITE_OK != sqlite3_bind_int64 \
-               ((_s), (_i)++, (_v))) \
-               fprintf(stderr, "%s\n", sqlite3_errmsg((_db))); \
-       } while (0)
-#define        SQL_BIND_BLOB(_db, _s, _i, _v) \
-       do { if (SQLITE_OK != sqlite3_bind_blob \
-               ((_s), (_i)++, (&_v), sizeof(_v), SQLITE_STATIC)) \
-               fprintf(stderr, "%s\n", sqlite3_errmsg((_db))); \
-       } while (0)
+#include "dbm.h"

 
 struct expr {
 
 struct expr {

-       uint64_t         bits;    /* type-mask */
-       const char      *substr;  /* to search for, if applicable */
-       regex_t          regexp;  /* compiled regexp, if applicable */
-       int              open;    /* opening parentheses before */
-       int              and;     /* logical AND before */
-       int              close;   /* closing parentheses after */
-       struct expr     *next;    /* next in sequence */
+       /* Used for terms: */
+       struct dbm_match match;   /* Match type and expression. */
+       uint64_t         bits;    /* Type mask. */
+       /* Used for OR and AND groups: */
+       struct expr     *next;    /* Next child in the parent group. */
+       struct expr     *child;   /* First child in this group. */
+       enum { EXPR_TERM, EXPR_OR, EXPR_AND } type;

 };
 
 };
 

-struct match {
-       uint64_t         pageid; /* identifier in database */
-       char            *desc; /* manual page description */
-       int              form; /* 0 == catpage */
+const char *const mansearch_keynames[KEY_MAX] = {
+       "arch", "sec",  "Xr",   "Ar",   "Fa",   "Fl",   "Dv",   "Fn",
+       "Ic",   "Pa",   "Cm",   "Li",   "Em",   "Cd",   "Va",   "Ft",
+       "Tn",   "Er",   "Ev",   "Sy",   "Sh",   "In",   "Ss",   "Ox",
+       "An",   "Mt",   "St",   "Bx",   "At",   "Nx",   "Fx",   "Lk",
+       "Ms",   "Bsx",  "Dx",   "Rs",   "Vt",   "Lb",   "Nm",   "Nd"

 };
 
 };
 

-static void             buildnames(struct manpage *, sqlite3 *,
-                               sqlite3_stmt *, uint64_t,
-                               const char *, int form);
-static char            *buildoutput(sqlite3 *, sqlite3_stmt *,
-                                uint64_t, uint64_t);
-static void            *hash_alloc(size_t, void *);
-static void             hash_free(void *, size_t, void *);
-static void            *hash_halloc(size_t, void *);
+
+static struct ohash    *manmerge(struct expr *, struct ohash *);
+static struct ohash    *manmerge_term(struct expr *, struct ohash *);
+static struct ohash    *manmerge_or(struct expr *, struct ohash *);
+static struct ohash    *manmerge_and(struct expr *, struct ohash *);
+static char            *buildnames(const struct dbm_page *);
+static char            *buildoutput(size_t, int32_t);
+static size_t           lstlen(const char *);
+static void             lstcat(char *, size_t *, const char *);
+static int              lstmatch(const char *, const char *);

 static struct expr     *exprcomp(const struct mansearch *,
 static struct expr     *exprcomp(const struct mansearch *,

-                               int, char *[]);
+                               int, char *[], int *);
+static struct expr     *expr_and(const struct mansearch *,
+                               int, char *[], int *);
+static struct expr     *exprterm(const struct mansearch *,
+                               int, char *[], int *);

 static void             exprfree(struct expr *);
 static void             exprfree(struct expr *);

-static struct expr     *exprspec(struct expr *, uint64_t,
-                                const char *, const char *);
-static struct expr     *exprterm(const struct mansearch *, char *, int);
-static void             sql_append(char **sql, size_t *sz,
-                               const char *newstr, int count);
-static void             sql_match(sqlite3_context *context,
-                               int argc, sqlite3_value **argv);
-static void             sql_regexp(sqlite3_context *context,
-                               int argc, sqlite3_value **argv);
-static char            *sql_statement(const struct expr *);
-
-
-int
-mansearch_setup(int start)
-{
-       static void     *pagecache;
-       int              c;
-
-#define        PC_PAGESIZE     1280
-#define        PC_NUMPAGES     256
-
-       if (start) {
-               if (NULL != pagecache) {
-                       fprintf(stderr, "pagecache already enabled\n");
-                       return((int)MANDOCLEVEL_BADARG);
-               }
-
-               pagecache = mmap(NULL, PC_PAGESIZE * PC_NUMPAGES,
-                   PROT_READ | PROT_WRITE, MAP_ANON, -1, 0);
-
-               if (MAP_FAILED == pagecache) {
-                       perror("mmap");
-                       pagecache = NULL;
-                       return((int)MANDOCLEVEL_SYSERR);
-               }
-
-               c = sqlite3_config(SQLITE_CONFIG_PAGECACHE,
-                   pagecache, PC_PAGESIZE, PC_NUMPAGES);
-
-               if (SQLITE_OK == c)
-                       return((int)MANDOCLEVEL_OK);
-
-               fprintf(stderr, "pagecache: %s\n", sqlite3_errstr(c));
-
-       } else if (NULL == pagecache) {
-               fprintf(stderr, "pagecache missing\n");
-               return((int)MANDOCLEVEL_BADARG);
-       }
-
-       if (-1 == munmap(pagecache, PC_PAGESIZE * PC_NUMPAGES)) {
-               perror("munmap");
-               pagecache = NULL;
-               return((int)MANDOCLEVEL_SYSERR);
-       }
+static int              manpage_compare(const void *, const void *);

 
 

-       pagecache = NULL;
-       return((int)MANDOCLEVEL_OK);
-}

 
 int
 mansearch(const struct mansearch *search,
                const struct manpaths *paths,
                int argc, char *argv[],
 
 int
 mansearch(const struct mansearch *search,
                const struct manpaths *paths,
                int argc, char *argv[],

-               const char *outkey,

                struct manpage **res, size_t *sz)
 {
                struct manpage **res, size_t *sz)
 {

-       int              fd, rc, c, indexbit;
-       int64_t          pageid;
-       uint64_t         outbit, iterbit;

        char             buf[PATH_MAX];
        char             buf[PATH_MAX];

-       char            *sql;
+       struct dbm_res  *rp;
+       struct expr     *e;
+       struct dbm_page *page;

        struct manpage  *mpage;
        struct manpage  *mpage;

-       struct expr     *e, *ep;
-       sqlite3         *db;
-       sqlite3_stmt    *s, *s2;
-       struct match    *mp;
-       struct ohash_info info;
-       struct ohash     htab;
-       unsigned int     idx;
-       size_t           i, j, cur, maxres;
-
-       memset(&info, 0, sizeof(struct ohash_info));
-
-       info.halloc = hash_halloc;
-       info.alloc = hash_alloc;
-       info.hfree = hash_free;
-       info.key_offset = offsetof(struct match, pageid);
-
-       *sz = cur = maxres = 0;
-       sql = NULL;
+       struct ohash    *htab;
+       size_t           cur, i, maxres, outkey;
+       unsigned int     slot;
+       int              argi, chdir_status, getcwd_status, im;
+
+       argi = 0;
+       if ((e = exprcomp(search, argc, argv, &argi)) == NULL) {
+               *sz = 0;
+               return 0;
+       }
+
+       cur = maxres = 0;

        *res = NULL;
        *res = NULL;

-       fd = -1;
-       e = NULL;
-       rc = 0;
-
-       if (0 == argc)
-               goto out;
-       if (NULL == (e = exprcomp(search, argc, argv)))
-               goto out;
-
-       outbit = 0;
-       if (NULL != outkey) {
-               for (indexbit = 0, iterbit = 1;
-                    indexbit < mansearch_keymax;
-                    indexbit++, iterbit <<= 1) {
-                       if (0 == strcasecmp(outkey,
-                           mansearch_keynames[indexbit])) {
-                               outbit = iterbit;
+
+       outkey = KEY_Nd;
+       if (search->outkey != NULL)
+               for (im = 0; im < KEY_MAX; im++)
+                       if (0 == strcasecmp(search->outkey,
+                           mansearch_keynames[im])) {
+                               outkey = im;

                                break;
                        }
                                break;
                        }

-               }
-       }

 
        /*
 
        /*

-        * Save a descriptor to the current working directory.
-        * Since pathnames in the "paths" variable might be relative,
-        * and we'll be chdir()ing into them, we need to keep a handle
-        * on our current directory from which to start the chdir().
+        * Remember the original working directory, if possible.
+        * This will be needed if the second or a later directory
+        * is given as a relative path.
+        * Do not error out if the current directory is not
+        * searchable: Maybe it won't be needed after all.

         */
 
         */
 

-       if (NULL == getcwd(buf, PATH_MAX)) {
-               perror("getcwd");
-               goto out;
-       } else if (-1 == (fd = open(buf, O_RDONLY, 0))) {
-               perror(buf);
-               goto out;
-       }
-
-       sql = sql_statement(e);
+       if (getcwd(buf, PATH_MAX) == NULL) {
+               getcwd_status = 0;
+               (void)strlcpy(buf, strerror(errno), sizeof(buf));
+       } else
+               getcwd_status = 1;

 
        /*
         * Loop over the directories (containing databases) for us to
 
        /*
         * Loop over the directories (containing databases) for us to


@@ -228,352 +135,375 @@ mansearch(const struct mansearch *search,
         * scan it for our match expression.
         */
 
         * scan it for our match expression.
         */
 

+       chdir_status = 0;

        for (i = 0; i < paths->sz; i++) {
        for (i = 0; i < paths->sz; i++) {

-               if (-1 == fchdir(fd)) {
-                       perror(buf);
-                       free(*res);
-                       break;
-               } else if (-1 == chdir(paths->paths[i])) {
-                       perror(paths->paths[i]);
+               if (chdir_status && paths->paths[i][0] != '/') {
+                       if ( ! getcwd_status) {
+                               warnx("%s: getcwd: %s", paths->paths[i], buf);
+                               continue;
+                       } else if (chdir(buf) == -1) {
+                               warn("%s", buf);
+                               continue;
+                       }
+               }
+               if (chdir(paths->paths[i]) == -1) {
+                       warn("%s", paths->paths[i]);

                        continue;
                }
                        continue;
                }

+               chdir_status = 1;

 
 

-               c = sqlite3_open_v2(MANDOC_DB, &db,
-                   SQLITE_OPEN_READONLY, NULL);
-
-               if (SQLITE_OK != c) {
-                       perror(MANDOC_DB);
-                       sqlite3_close(db);
+               if (dbm_open(MANDOC_DB) == -1) {
+                       warn("%s/%s", paths->paths[i], MANDOC_DB);

                        continue;
                }
 
                        continue;
                }
 

-               /*
-                * Define the SQL functions for substring
-                * and regular expression matching.
-                */
-
-               c = sqlite3_create_function(db, "match", 2,
-                   SQLITE_UTF8 | SQLITE_DETERMINISTIC,
-                   NULL, sql_match, NULL, NULL);
-               assert(SQLITE_OK == c);
-               c = sqlite3_create_function(db, "regexp", 2,
-                   SQLITE_UTF8 | SQLITE_DETERMINISTIC,
-                   NULL, sql_regexp, NULL, NULL);
-               assert(SQLITE_OK == c);
-
-               j = 1;
-               c = sqlite3_prepare_v2(db, sql, -1, &s, NULL);
-               if (SQLITE_OK != c)
-                       fprintf(stderr, "%s\n", sqlite3_errmsg(db));
-
-               for (ep = e; NULL != ep; ep = ep->next) {
-                       if (NULL == ep->substr) {
-                               SQL_BIND_BLOB(db, s, j, ep->regexp);
-                       } else
-                               SQL_BIND_TEXT(db, s, j, ep->substr);
-                       if (0 == ((TYPE_Nd | TYPE_Nm) & ep->bits))
-                               SQL_BIND_INT64(db, s, j, ep->bits);
+               if ((htab = manmerge(e, NULL)) == NULL) {
+                       dbm_close();
+                       continue;

                }
 
                }
 

-               memset(&htab, 0, sizeof(struct ohash));
-               ohash_init(&htab, 4, &info);
+               for (rp = ohash_first(htab, &slot); rp != NULL;
+                   rp = ohash_next(htab, &slot)) {
+                       page = dbm_page_get(rp->page);

 
 

-               /*
-                * Hash each entry on its [unique] document identifier.
-                * This is a uint64_t.
-                * Instead of using a hash function, simply convert the
-                * uint64_t to a uint32_t, the hash value's type.
-                * This gives good performance and preserves the
-                * distribution of buckets in the table.
-                */
-               while (SQLITE_ROW == (c = sqlite3_step(s))) {
-                       pageid = sqlite3_column_int64(s, 2);
-                       idx = ohash_lookup_memory(&htab,
-                           (char *)&pageid, sizeof(uint64_t),
-                           (uint32_t)pageid);
-
-                       if (NULL != ohash_find(&htab, idx))
+                       if (lstmatch(search->sec, page->sect) == 0 ||
+                           lstmatch(search->arch, page->arch) == 0)

                                continue;
 
                                continue;
 

-                       mp = mandoc_calloc(1, sizeof(struct match));
-                       mp->pageid = pageid;
-                       mp->form = sqlite3_column_int(s, 1);
-                       if (TYPE_Nd == outbit)
-                               mp->desc = mandoc_strdup(
-                                   sqlite3_column_text(s, 0));
-                       ohash_insert(&htab, idx, mp);
-               }
-
-               if (SQLITE_DONE != c)
-                       fprintf(stderr, "%s\n", sqlite3_errmsg(db));
-
-               sqlite3_finalize(s);
-
-               c = sqlite3_prepare_v2(db,
-                   "SELECT * FROM mlinks WHERE pageid=?"
-                   " ORDER BY sec, arch, name",
-                   -1, &s, NULL);
-               if (SQLITE_OK != c)
-                       fprintf(stderr, "%s\n", sqlite3_errmsg(db));
-
-               c = sqlite3_prepare_v2(db,
-                   "SELECT * FROM keys WHERE pageid=? AND bits & ?",
-                   -1, &s2, NULL);
-               if (SQLITE_OK != c)
-                       fprintf(stderr, "%s\n", sqlite3_errmsg(db));
-
-               for (mp = ohash_first(&htab, &idx);
-                               NULL != mp;
-                               mp = ohash_next(&htab, &idx)) {

                        if (cur + 1 > maxres) {
                                maxres += 1024;
                        if (cur + 1 > maxres) {
                                maxres += 1024;

-                               *res = mandoc_realloc(*res,
-                                   maxres * sizeof(struct manpage));
+                               *res = mandoc_reallocarray(*res,
+                                   maxres, sizeof(**res));

                        }
                        mpage = *res + cur;
                        }
                        mpage = *res + cur;

-                       mpage->form = mp->form;
-                       buildnames(mpage, db, s, mp->pageid,
-                           paths->paths[i], mp->form);
-                       mpage->output = TYPE_Nd & outbit ?
-                           mp->desc : outbit ?
-                           buildoutput(db, s2, mp->pageid, outbit) : NULL;
-
-                       free(mp);
+                       mandoc_asprintf(&mpage->file, "%s/%s",
+                           paths->paths[i], page->file + 1);
+                       mpage->names = buildnames(page);
+                       mpage->output = (int)outkey == KEY_Nd ?
+                           mandoc_strdup(page->desc) :
+                           buildoutput(outkey, page->addr);
+                       mpage->ipath = i;
+                       mpage->bits = rp->bits;
+                       mpage->sec = *page->sect - '0';
+                       if (mpage->sec < 0 || mpage->sec > 9)
+                               mpage->sec = 10;
+                       mpage->form = *page->file;
+                       free(rp);

                        cur++;
                }
                        cur++;
                }

+               ohash_delete(htab);
+               free(htab);
+               dbm_close();

 
 

-               sqlite3_finalize(s);
-               sqlite3_finalize(s2);
-               sqlite3_close(db);
-               ohash_delete(&htab);
-       }
-       rc = 1;
-out:
-       if (-1 != fd) {
-               if (-1 == fchdir(fd))
-                       perror(buf);
-               close(fd);
+               /*
+                * In man(1) mode, prefer matches in earlier trees
+                * over matches in later trees.
+                */
+
+               if (cur && search->firstmatch)
+                       break;

        }
        }

+       qsort(*res, cur, sizeof(struct manpage), manpage_compare);
+       if (chdir_status && getcwd_status && chdir(buf) == -1)
+               warn("%s", buf);

        exprfree(e);
        exprfree(e);

-       free(sql);

        *sz = cur;
        *sz = cur;

-       return(rc);
+       return 1;

 }
 
 }
 

-static void
-buildnames(struct manpage *mpage, sqlite3 *db, sqlite3_stmt *s,
-               uint64_t pageid, const char *path, int form)
+/*
+ * Merge the results for the expression tree rooted at e
+ * into the the result list htab.
+ */
+static struct ohash *
+manmerge(struct expr *e, struct ohash *htab)

 {
 {

-       char            *newnames, *prevsec, *prevarch;
-       const char      *oldnames, *sep1, *name, *sec, *sep2, *arch, *fsec;
-       size_t           i;
-       int              c;
-
-       mpage->file = NULL;
-       mpage->names = NULL;
-       prevsec = prevarch = NULL;
-       i = 1;
-       SQL_BIND_INT64(db, s, i, pageid);
-       while (SQLITE_ROW == (c = sqlite3_step(s))) {
-
-               /* Decide whether we already have some names. */
-
-               if (NULL == mpage->names) {
-                       oldnames = "";
-                       sep1 = "";
-               } else {
-                       oldnames = mpage->names;
-                       sep1 = ", ";
+       switch (e->type) {
+       case EXPR_TERM:
+               return manmerge_term(e, htab);
+       case EXPR_OR:
+               return manmerge_or(e->child, htab);
+       case EXPR_AND:
+               return manmerge_and(e->child, htab);
+       default:
+               abort();
+       }
+}
+
+static struct ohash *
+manmerge_term(struct expr *e, struct ohash *htab)
+{
+       struct dbm_res   res, *rp;
+       uint64_t         ib;
+       unsigned int     slot;
+       int              im;
+
+       if (htab == NULL) {
+               htab = mandoc_malloc(sizeof(*htab));
+               mandoc_ohash_init(htab, 4, offsetof(struct dbm_res, page));
+       }
+
+       for (im = 0, ib = 1; im < KEY_MAX; im++, ib <<= 1) {
+               if ((e->bits & ib) == 0)
+                       continue;
+
+               switch (ib) {
+               case TYPE_arch:
+                       dbm_page_byarch(&e->match);
+                       break;
+               case TYPE_sec:
+                       dbm_page_bysect(&e->match);
+                       break;
+               case TYPE_Nm:
+                       dbm_page_byname(&e->match);
+                       break;
+               case TYPE_Nd:
+                       dbm_page_bydesc(&e->match);
+                       break;
+               default:
+                       dbm_page_bymacro(im - 2, &e->match);
+                       break;

                }
 
                }
 

-               /* Fetch the next name. */
-
-               sec = sqlite3_column_text(s, 0);
-               arch = sqlite3_column_text(s, 1);
-               name = sqlite3_column_text(s, 2);
-
-               /* If the section changed, append the old one. */
-
-               if (NULL != prevsec &&
-                   (strcmp(sec, prevsec) ||
-                    strcmp(arch, prevarch))) {
-                       sep2 = '\0' == *prevarch ? "" : "/";
-                       mandoc_asprintf(&newnames, "%s(%s%s%s)",
-                           oldnames, prevsec, sep2, prevarch);
-                       free(mpage->names);
-                       oldnames = mpage->names = newnames;
-                       free(prevsec);
-                       free(prevarch);
-                       prevsec = prevarch = NULL;
+               /*
+                * When hashing for deduplication, use the unique
+                * page ID itself instead of a hash function;
+                * that is quite efficient.
+                */
+
+               for (;;) {
+                       res = dbm_page_next();
+                       if (res.page == -1)
+                               break;
+                       slot = ohash_lookup_memory(htab,
+                           (char *)&res, sizeof(res.page), res.page);
+                       if ((rp = ohash_find(htab, slot)) != NULL) {
+                               rp->bits |= res.bits;
+                               continue;
+                       }
+                       rp = mandoc_malloc(sizeof(*rp));
+                       *rp = res;
+                       ohash_insert(htab, slot, rp);

                }
                }

+       }
+       return htab;
+}

 
 

-               /* Save the new section, to append it later. */
+static struct ohash *
+manmerge_or(struct expr *e, struct ohash *htab)
+{
+       while (e != NULL) {
+               htab = manmerge(e, htab);
+               e = e->next;
+       }
+       return htab;
+}

 
 

-               if (NULL == prevsec) {
-                       prevsec = mandoc_strdup(sec);
-                       prevarch = mandoc_strdup(arch);
+static struct ohash *
+manmerge_and(struct expr *e, struct ohash *htab)
+{
+       struct ohash    *hand, *h1, *h2;
+       struct dbm_res  *res;
+       unsigned int     slot1, slot2;
+
+       /* Evaluate the first term of the AND clause. */
+
+       hand = manmerge(e, NULL);
+
+       while ((e = e->next) != NULL) {
+
+               /* Evaluate the next term and prepare for ANDing. */
+
+               h2 = manmerge(e, NULL);
+               if (ohash_entries(h2) < ohash_entries(hand)) {
+                       h1 = h2;
+                       h2 = hand;
+               } else
+                       h1 = hand;
+               hand = mandoc_malloc(sizeof(*hand));
+               mandoc_ohash_init(hand, 4, offsetof(struct dbm_res, page));
+
+               /* Keep all pages that are in both result sets. */
+
+               for (res = ohash_first(h1, &slot1); res != NULL;
+                   res = ohash_next(h1, &slot1)) {
+                       if (ohash_find(h2, ohash_lookup_memory(h2,
+                           (char *)res, sizeof(res->page),
+                           res->page)) == NULL)
+                               free(res);
+                       else
+                               ohash_insert(hand, ohash_lookup_memory(hand,
+                                   (char *)res, sizeof(res->page),
+                                   res->page), res);

                }
 
                }
 

-               /* Append the new name. */
+               /* Discard the merged results. */

 
 

-               mandoc_asprintf(&newnames, "%s%s%s",
-                   oldnames, sep1, name);
-               free(mpage->names);
-               mpage->names = newnames;
+               for (res = ohash_first(h2, &slot2); res != NULL;
+                   res = ohash_next(h2, &slot2))
+                       free(res);
+               ohash_delete(h2);
+               free(h2);
+               ohash_delete(h1);
+               free(h1);
+       }

 
 

-               /* Also save the first file name encountered. */
+       /* Merge the result of the AND into htab. */

 
 

-               if (NULL != mpage->file)
-                       continue;
+       if (htab == NULL)
+               return hand;

 
 

-               if (form) {
-                       sep1 = "man";
-                       fsec = sec;
-               } else {
-                       sep1 = "cat";
-                       fsec = "0";
-               }
-               sep2 = '\0' == *arch ? "" : "/";
-               mandoc_asprintf(&mpage->file, "%s/%s%s%s%s/%s.%s",
-                   path, sep1, sec, sep2, arch, name, fsec);
+       for (res = ohash_first(hand, &slot1); res != NULL;
+           res = ohash_next(hand, &slot1)) {
+               slot2 = ohash_lookup_memory(htab,
+                   (char *)res, sizeof(res->page), res->page);
+               if (ohash_find(htab, slot2) == NULL)
+                       ohash_insert(htab, slot2, res);
+               else
+                       free(res);

        }
        }

-       if (SQLITE_DONE != c)
-               fprintf(stderr, "%s\n", sqlite3_errmsg(db));
-       sqlite3_reset(s);
-
-       /* Append one final section to the names. */
-
-       if (NULL != prevsec) {
-               sep2 = '\0' == *prevarch ? "" : "/";
-               mandoc_asprintf(&newnames, "%s(%s%s%s)",
-                   mpage->names, prevsec, sep2, prevarch);
-               free(mpage->names);
-               mpage->names = newnames;
-               free(prevsec);
-               free(prevarch);
+
+       /* Discard the merged result. */
+
+       ohash_delete(hand);
+       free(hand);
+       return htab;
+}
+
+void
+mansearch_free(struct manpage *res, size_t sz)
+{
+       size_t   i;
+
+       for (i = 0; i < sz; i++) {
+               free(res[i].file);
+               free(res[i].names);
+               free(res[i].output);

        }
        }

+       free(res);

 }
 
 }
 

-static char *
-buildoutput(sqlite3 *db, sqlite3_stmt *s, uint64_t pageid, uint64_t outbit)
+static int
+manpage_compare(const void *vp1, const void *vp2)

 {
 {

-       char            *output, *newoutput;
-       const char      *oldoutput, *sep1, *data;
-       size_t           i;
-       int              c;
+       const struct manpage    *mp1, *mp2;
+       int                      diff;
+
+       mp1 = vp1;
+       mp2 = vp2;
+       return (diff = mp2->bits - mp1->bits) ? diff :
+           (diff = mp1->sec - mp2->sec) ? diff :
+           strcasecmp(mp1->names, mp2->names);
+}

 
 

-       output = NULL;
-       i = 1;
-       SQL_BIND_INT64(db, s, i, pageid);
-       SQL_BIND_INT64(db, s, i, outbit);
-       while (SQLITE_ROW == (c = sqlite3_step(s))) {
-               if (NULL == output) {
-                       oldoutput = "";
-                       sep1 = "";
-               } else {
-                       oldoutput = output;
-                       sep1 = " # ";
-               }
-               data = sqlite3_column_text(s, 1);
-               mandoc_asprintf(&newoutput, "%s%s%s",
-                   oldoutput, sep1, data);
-               free(output);
-               output = newoutput;
+static char *
+buildnames(const struct dbm_page *page)
+{
+       char    *buf;
+       size_t   i, sz;
+
+       sz = lstlen(page->name) + 1 + lstlen(page->sect) +
+           (page->arch == NULL ? 0 : 1 + lstlen(page->arch)) + 2;
+       buf = mandoc_malloc(sz);
+       i = 0;
+       lstcat(buf, &i, page->name);
+       buf[i++] = '(';
+       lstcat(buf, &i, page->sect);
+       if (page->arch != NULL) {
+               buf[i++] = '/';
+               lstcat(buf, &i, page->arch);

        }
        }

-       if (SQLITE_DONE != c)
-               fprintf(stderr, "%s\n", sqlite3_errmsg(db));
-       sqlite3_reset(s);
-       return(output);
+       buf[i++] = ')';
+       buf[i++] = '\0';
+       assert(i == sz);
+       return buf;

 }
 
 /*
 }
 
 /*

- * Implement substring match as an application-defined SQL function.
- * Using the SQL LIKE or GLOB operators instead would be a bad idea
- * because that would require escaping metacharacters in the string
- * being searched for.
+ * Count the buffer space needed to print the NUL-terminated
+ * list of NUL-terminated strings, when printing two separator
+ * characters between strings.

  */
  */

-static void
-sql_match(sqlite3_context *context, int argc, sqlite3_value **argv)
+static size_t
+lstlen(const char *cp)

 {
 {

+       size_t   sz;

 
 

-       assert(2 == argc);
-       sqlite3_result_int(context, NULL != strcasestr(
-           (const char *)sqlite3_value_text(argv[1]),
-           (const char *)sqlite3_value_text(argv[0])));
+       for (sz = 0;; sz++) {
+               if (cp[0] == '\0') {
+                       if (cp[1] == '\0')
+                               break;
+                       sz++;
+               } else if (cp[0] < ' ')
+                       sz--;
+               cp++;
+       }
+       return sz;

 }
 
 /*
 }
 
 /*

- * Implement regular expression match
- * as an application-defined SQL function.
+ * Print the NUL-terminated list of NUL-terminated strings
+ * into the buffer, seperating strings with a comma and a blank.

  */
 static void
  */
 static void

-sql_regexp(sqlite3_context *context, int argc, sqlite3_value **argv)
+lstcat(char *buf, size_t *i, const char *cp)

 {
 {

-
-       assert(2 == argc);
-       sqlite3_result_int(context, !regexec(
-           (regex_t *)sqlite3_value_blob(argv[0]),
-           (const char *)sqlite3_value_text(argv[1]),
-           0, NULL, 0));
+       for (;;) {
+               if (cp[0] == '\0') {
+                       if (cp[1] == '\0')
+                               break;
+                       buf[(*i)++] = ',';
+                       buf[(*i)++] = ' ';
+               } else if (cp[0] >= ' ')
+                       buf[(*i)++] = cp[0];
+               cp++;
+       }

 }
 
 }
 

-static void
-sql_append(char **sql, size_t *sz, const char *newstr, int count)
+/*
+ * Return 1 if the string *want occurs in any of the strings
+ * in the NUL-terminated string list *have, or 0 otherwise.
+ * If either argument is NULL or empty, assume no filtering
+ * is desired and return 1.
+ */
+static int
+lstmatch(const char *want, const char *have)

 {
 {

-       size_t           newsz;
-
-       newsz = 1 < count ? (size_t)count : strlen(newstr);
-       *sql = mandoc_realloc(*sql, *sz + newsz + 1);
-       if (1 < count)
-               memset(*sql + *sz, *newstr, (size_t)count);
-       else
-               memcpy(*sql + *sz, newstr, newsz);
-       *sz += newsz;
-       (*sql)[*sz] = '\0';
+        if (want == NULL || have == NULL || *have == '\0')
+                return 1;
+        while (*have != '\0') {
+                if (strcasestr(have, want) != NULL)
+                        return 1;
+                have = strchr(have, '\0') + 1;
+        }
+        return 0;

 }
 
 /*
 }
 
 /*

- * Prepare the search SQL statement.
+ * Build a list of values taken by the macro im
+ * in the manual page with big-endian address addr.

  */
 static char *
  */
 static char *

-sql_statement(const struct expr *e)
+buildoutput(size_t im, int32_t addr)

 {
 {

-       char            *sql;
-       size_t           sz;
-       int              needop;
-
-       sql = mandoc_strdup("SELECT * FROM mpages WHERE ");
-       sz = strlen(sql);
-
-       for (needop = 0; NULL != e; e = e->next) {
-               if (e->and)
-                       sql_append(&sql, &sz, " AND ", 1);
-               else if (needop)
-                       sql_append(&sql, &sz, " OR ", 1);
-               if (e->open)
-                       sql_append(&sql, &sz, "(", e->open);
-               sql_append(&sql, &sz,
-                   TYPE_Nd & e->bits
-                   ? (NULL == e->substr
-                       ? "desc REGEXP ?"
-                       : "desc MATCH ?")
-                   : TYPE_Nm == e->bits
-                   ? (NULL == e->substr
-                       ? "pageid IN (SELECT pageid FROM names "
-                         "WHERE name REGEXP ?)"
-                       : "pageid IN (SELECT pageid FROM names "
-                         "WHERE name MATCH ?)")
-                   : (NULL == e->substr
-                       ? "pageid IN (SELECT pageid FROM keys "
-                         "WHERE key REGEXP ? AND bits & ?)"
-                       : "pageid IN (SELECT pageid FROM keys "
-                         "WHERE key MATCH ? AND bits & ?)"), 1);
-               if (e->close)
-                       sql_append(&sql, &sz, ")", e->close);
-               needop = 1;
-       }
+       const char      *oldoutput, *sep;
+       char            *output, *newoutput, *value;

 
 

-       return(sql);
+       output = NULL;
+       dbm_macro_bypage(im - 2, addr);
+       while ((value = dbm_macro_next()) != NULL) {
+               if (output == NULL) {
+                       oldoutput = "";
+                       sep = "";
+               } else {
+                       oldoutput = output;
+                       sep = " # ";
+               }
+               mandoc_asprintf(&newoutput, "%s%s%s", oldoutput, sep, value);
+               free(output);
+               output = newoutput;
+       }
+       return output;

 }
 
 /*
 }
 
 /*


@@ -582,228 +512,238 @@ sql_statement(const struct expr *e)
  * "(", "foo=bar", etc.).
  */
 static struct expr *
  * "(", "foo=bar", etc.).
  */
 static struct expr *

-exprcomp(const struct mansearch *search, int argc, char *argv[])
+exprcomp(const struct mansearch *search, int argc, char *argv[], int *argi)

 {
 {

-       uint64_t         mask;
-       int              i, toopen, logic, igncase, toclose;
-       struct expr     *first, *prev, *cur, *next;
-
-       first = cur = NULL;
-       logic = igncase = toclose = 0;
-       toopen = NULL != search->sec || NULL != search->arch;
-
-       for (i = 0; i < argc; i++) {
-               if (0 == strcmp("(", argv[i])) {
-                       if (igncase)
-                               goto fail;
-                       toopen++;
-                       toclose++;
-                       continue;
-               } else if (0 == strcmp(")", argv[i])) {
-                       if (toopen || logic || igncase || NULL == cur)
-                               goto fail;
-                       cur->close++;
-                       if (0 > --toclose)
-                               goto fail;
-                       continue;
-               } else if (0 == strcmp("-a", argv[i])) {
-                       if (toopen || logic || igncase || NULL == cur)
-                               goto fail;
-                       logic = 1;
+       struct expr     *parent, *child;
+       int              needterm, nested;
+
+       if ((nested = *argi) == argc)
+               return NULL;
+       needterm = 1;
+       parent = child = NULL;
+       while (*argi < argc) {
+               if (strcmp(")", argv[*argi]) == 0) {
+                       if (needterm)
+                               warnx("missing term "
+                                   "before closing parenthesis");
+                       needterm = 0;
+                       if (nested)
+                               break;
+                       warnx("ignoring unmatched right parenthesis");
+                       ++*argi;

                        continue;
                        continue;

-               } else if (0 == strcmp("-o", argv[i])) {
-                       if (toopen || logic || igncase || NULL == cur)
-                               goto fail;
-                       logic = 2;
+               }
+               if (strcmp("-o", argv[*argi]) == 0) {
+                       if (needterm) {
+                               if (*argi > 0)
+                                       warnx("ignoring -o after %s",
+                                           argv[*argi - 1]);
+                               else
+                                       warnx("ignoring initial -o");
+                       }
+                       needterm = 1;
+                       ++*argi;

                        continue;
                        continue;

-               } else if (0 == strcmp("-i", argv[i])) {
-                       if (igncase)
-                               goto fail;
-                       igncase = 1;
+               }
+               needterm = 0;
+               if (child == NULL) {
+                       child = expr_and(search, argc, argv, argi);

                        continue;
                }
                        continue;
                }

-               next = exprterm(search, argv[i], !igncase);
-               if (NULL == next)
-                       goto fail;
-               if (NULL == first)
-                       first = next;
-               else
-                       cur->next = next;
-               prev = cur = next;
-
-               /*
-                * Searching for descriptions must be split out
-                * because they are stored in the mpages table,
-                * not in the keys table.
-                */
-
-               for (mask = TYPE_Nm; mask <= TYPE_Nd; mask <<= 1) {
-                       if (mask & cur->bits && ~mask & cur->bits) {
-                               next = mandoc_calloc(1,
-                                   sizeof(struct expr));
-                               memcpy(next, cur, sizeof(struct expr));
-                               prev->open = 1;
-                               cur->bits = mask;
-                               cur->next = next;
-                               cur = next;
-                               cur->bits &= ~mask;
-                       }
+               if (parent == NULL) {
+                       parent = mandoc_calloc(1, sizeof(*parent));
+                       parent->type = EXPR_OR;
+                       parent->next = NULL;
+                       parent->child = child;

                }
                }

-               prev->and = (1 == logic);
-               prev->open += toopen;
-               if (cur != prev)
-                       cur->close = 1;
-
-               toopen = logic = igncase = 0;
+               child->next = expr_and(search, argc, argv, argi);
+               child = child->next;

        }
        }

-       if (toopen || logic || igncase || toclose)
-               goto fail;
-
-       if (NULL != search->sec || NULL != search->arch)
-               cur->close++;
-       if (NULL != search->arch)
-               cur = exprspec(cur, TYPE_arch, search->arch, "^(%s|any)$");
-       if (NULL != search->sec)
-               exprspec(cur, TYPE_sec, search->sec, "^%s$");
-
-       return(first);
-
-fail:
-       if (NULL != first)
-               exprfree(first);
-       return(NULL);
+       if (needterm && *argi)
+               warnx("ignoring trailing %s", argv[*argi - 1]);
+       return parent == NULL ? child : parent;

 }
 
 static struct expr *
 }
 
 static struct expr *

-exprspec(struct expr *cur, uint64_t key, const char *value,
-               const char *format)
+expr_and(const struct mansearch *search, int argc, char *argv[], int *argi)

 {
 {

-       char     errbuf[BUFSIZ];
-       char    *cp;
-       int      irc;
-
-       mandoc_asprintf(&cp, format, value);
-       cur->next = mandoc_calloc(1, sizeof(struct expr));
-       cur = cur->next;
-       cur->and = 1;
-       cur->bits = key;
-       if (0 != (irc = regcomp(&cur->regexp, cp,
-           REG_EXTENDED | REG_NOSUB | REG_ICASE))) {
-               regerror(irc, &cur->regexp, errbuf, sizeof(errbuf));
-               fprintf(stderr, "regcomp: %s\n", errbuf);
-               cur->substr = value;
+       struct expr     *parent, *child;
+       int              needterm;
+
+       needterm = 1;
+       parent = child = NULL;
+       while (*argi < argc) {
+               if (strcmp(")", argv[*argi]) == 0) {
+                       if (needterm)
+                               warnx("missing term "
+                                   "before closing parenthesis");
+                       needterm = 0;
+                       break;
+               }
+               if (strcmp("-o", argv[*argi]) == 0)
+                       break;
+               if (strcmp("-a", argv[*argi]) == 0) {
+                       if (needterm) {
+                               if (*argi > 0)
+                                       warnx("ignoring -a after %s",
+                                           argv[*argi - 1]);
+                               else
+                                       warnx("ignoring initial -a");
+                       }
+                       needterm = 1;
+                       ++*argi;
+                       continue;
+               }
+               if (needterm == 0)
+                       break;
+               if (child == NULL) {
+                       child = exprterm(search, argc, argv, argi);
+                       if (child != NULL)
+                               needterm = 0;
+                       continue;
+               }
+               needterm = 0;
+               if (parent == NULL) {
+                       parent = mandoc_calloc(1, sizeof(*parent));
+                       parent->type = EXPR_AND;
+                       parent->next = NULL;
+                       parent->child = child;
+               }
+               child->next = exprterm(search, argc, argv, argi);
+               if (child->next != NULL) {
+                       child = child->next;
+                       needterm = 0;
+               }

        }
        }

-       free(cp);
-       return(cur);
+       if (needterm && *argi)
+               warnx("ignoring trailing %s", argv[*argi - 1]);
+       return parent == NULL ? child : parent;

 }
 
 static struct expr *
 }
 
 static struct expr *

-exprterm(const struct mansearch *search, char *buf, int cs)
+exprterm(const struct mansearch *search, int argc, char *argv[], int *argi)

 {
        char             errbuf[BUFSIZ];
        struct expr     *e;
 {
        char             errbuf[BUFSIZ];
        struct expr     *e;

-       char            *key, *v;
+       char            *key, *val;

        uint64_t         iterbit;
        uint64_t         iterbit;

-       int              i, irc;
-
-       if ('\0' == *buf)
-               return(NULL);
-
-       e = mandoc_calloc(1, sizeof(struct expr));
-
-       /*"whatis" mode uses an opaque string and default fields. */
+       int              cs, i, irc;
+
+       if (strcmp("(", argv[*argi]) == 0) {
+               ++*argi;
+               e = exprcomp(search, argc, argv, argi);
+               if (*argi < argc) {
+                       assert(strcmp(")", argv[*argi]) == 0);
+                       ++*argi;
+               } else
+                       warnx("unclosed parenthesis");
+               return e;
+       }

 
 

-       if (MANSEARCH_WHATIS & search->flags) {
-               e->substr = buf;
-               e->bits = search->deftype;
-               return(e);
+       e = mandoc_calloc(1, sizeof(*e));
+       e->type = EXPR_TERM;
+       e->bits = 0;
+       e->next = NULL;
+       e->child = NULL;
+
+       if (search->argmode == ARG_NAME) {
+               e->bits = TYPE_Nm;
+               e->match.type = DBM_EXACT;
+               e->match.str = argv[(*argi)++];
+               return e;

        }
 
        /*
        }
 
        /*

-        * If no =~ is specified, search with equality over names and
-        * descriptions.
-        * If =~ begins the phrase, use name and description fields.
+        * Separate macro keys from search string.
+        * If needed, request regular expression handling.

         */
 
         */
 

-       if (NULL == (v = strpbrk(buf, "=~"))) {
-               e->substr = buf;
-               e->bits = search->deftype;
-               return(e);
-       } else if (v == buf)
-               e->bits = search->deftype;
-
-       if ('~' == *v++) {
-               if (NULL != strstr(buf, "arch"))
+       if (search->argmode == ARG_WORD) {
+               e->bits = TYPE_Nm;
+               e->match.type = DBM_REGEX;
+#if HAVE_REWB_BSD
+               mandoc_asprintf(&val, "[[:<:]]%s[[:>:]]", argv[*argi]);
+#elif HAVE_REWB_SYSV
+               mandoc_asprintf(&val, "\\<%s\\>", argv[*argi]);
+#else
+               mandoc_asprintf(&val,
+                   "(^|[^a-zA-Z01-9_])%s([^a-zA-Z01-9_]|$)", argv[*argi]);
+#endif
+               cs = 0;
+       } else if ((val = strpbrk(argv[*argi], "=~")) == NULL) {
+               e->bits = TYPE_Nm | TYPE_Nd;
+               e->match.type = DBM_SUB;
+               e->match.str = argv[*argi];
+       } else {
+               if (val == argv[*argi])
+                       e->bits = TYPE_Nm | TYPE_Nd;
+               if (*val == '=') {
+                       e->match.type = DBM_SUB;
+                       e->match.str = val + 1;
+               } else
+                       e->match.type = DBM_REGEX;
+               *val++ = '\0';
+               if (strstr(argv[*argi], "arch") != NULL)

                        cs = 0;
                        cs = 0;

-               if (0 != (irc = regcomp(&e->regexp, v,
-                   REG_EXTENDED | REG_NOSUB | (cs ? 0 : REG_ICASE)))) {
-                       regerror(irc, &e->regexp, errbuf, sizeof(errbuf));
-                       fprintf(stderr, "regcomp: %s\n", errbuf);
+       }
+
+       /* Compile regular expressions. */
+
+       if (e->match.type == DBM_REGEX) {
+               e->match.re = mandoc_malloc(sizeof(*e->match.re));
+               irc = regcomp(e->match.re, val,
+                   REG_EXTENDED | REG_NOSUB | (cs ? 0 : REG_ICASE));
+               if (irc) {
+                       regerror(irc, e->match.re, errbuf, sizeof(errbuf));
+                       warnx("regcomp /%s/: %s", val, errbuf);
+               }
+               if (search->argmode == ARG_WORD)
+                       free(val);
+               if (irc) {
+                       free(e->match.re);

                        free(e);
                        free(e);

-                       return(NULL);
+                       ++*argi;
+                       return NULL;

                }
                }

-       } else
-               e->substr = v;
-       v[-1] = '\0';
+       }
+
+       if (e->bits) {
+               ++*argi;
+               return e;
+       }

 
        /*
         * Parse out all possible fields.
         * If the field doesn't resolve, bail.
         */
 
 
        /*
         * Parse out all possible fields.
         * If the field doesn't resolve, bail.
         */
 

-       while (NULL != (key = strsep(&buf, ","))) {
+       while (NULL != (key = strsep(&argv[*argi], ","))) {

                if ('\0' == *key)
                        continue;
                if ('\0' == *key)
                        continue;

-               for (i = 0, iterbit = 1;
-                    i < mansearch_keymax;
-                    i++, iterbit <<= 1) {
-                       if (0 == strcasecmp(key,
-                           mansearch_keynames[i])) {
+               for (i = 0, iterbit = 1; i < KEY_MAX; i++, iterbit <<= 1) {
+                       if (0 == strcasecmp(key, mansearch_keynames[i])) {

                                e->bits |= iterbit;
                                break;
                        }
                }
                                e->bits |= iterbit;
                                break;
                        }
                }

-               if (i == mansearch_keymax) {
-                       if (strcasecmp(key, "any")) {
-                               free(e);
-                               return(NULL);
-                       }
+               if (i == KEY_MAX) {
+                       if (strcasecmp(key, "any"))
+                               warnx("treating unknown key "
+                                   "\"%s\" as \"any\"", key);

                        e->bits |= ~0ULL;
                }
        }
 
                        e->bits |= ~0ULL;
                }
        }
 

-       return(e);
-}
-
-static void
-exprfree(struct expr *p)
-{
-       struct expr     *pp;
-
-       while (NULL != p) {
-               pp = p->next;
-               free(p);
-               p = pp;
-       }
-}
-
-static void *
-hash_halloc(size_t sz, void *arg)
-{
-
-       return(mandoc_calloc(sz, 1));
-}
-
-static void *
-hash_alloc(size_t sz, void *arg)
-{
-
-       return(mandoc_malloc(sz));
+       ++*argi;
+       return e;

 }
 
 static void
 }
 
 static void

-hash_free(void *p, size_t sz, void *arg)
+exprfree(struct expr *e)

 {
 {

-
-       free(p);
+       if (e->next != NULL)
+               exprfree(e->next);
+       if (e->child != NULL)
+               exprfree(e->child);
+       free(e);

 }
 }