Removed dotted2oid which exists in YAZ already
[simpleserver-moved-to-github.git] / SimpleServer.xs
index 77c3fc6..f3899e7 100644 (file)
@@ -1,5 +1,8 @@
 /*
- * Copyright (c) 2000, Index Data.
+ * $Id: SimpleServer.xs,v 1.58 2007-04-17 07:56:29 adam Exp $ 
+ * ----------------------------------------------------------------------
+ * 
+ * Copyright (c) 2000-2004, Index Data.
  *
  * Permission to use, copy, modify, distribute, and sell this software and
  * its documentation, in whole or in part, for any purpose, is hereby granted,
  * OF THIS SOFTWARE.
  */
 
-/*$Log: SimpleServer.xs,v $
-/*Revision 1.12  2001-08-30 14:02:10  sondberg
-/*Small changes.
-/*
-/*Revision 1.11  2001/08/30 13:15:11  sondberg
-/*Corrected a memory leak, one more to go.
-/*
-/*Revision 1.10  2001/08/29 11:48:36  sondberg
-/*Added routines
-/*
-/*     Net::Z3950::SimpleServer::ScanSuccess
-/*     Net::Z3950::SimpleServer::ScanPartial
-/*
-/*and a bit of documentation.
-/*
-/*Revision 1.9  2001/08/24 14:00:20  sondberg
-/*Added support for scan.
-/*
-/*Revision 1.8  2001/05/21 11:07:02  sondberg
-/*Extended maximum numbers of GRS-1 elements. Should be done dynamically.
-/*
-/*Revision 1.7  2001/03/13 14:17:15  sondberg
-/*Added support for GRS-1.
-/**/
-
-
 #include "EXTERN.h"
 #include "perl.h"
+#include "proto.h"
+#include "embed.h"
 #include "XSUB.h"
 #include <yaz/backend.h>
 #include <yaz/log.h>
 #include <yaz/wrbuf.h>
+#include <yaz/querytowrbuf.h>
 #include <stdio.h>
+#ifdef WIN32
+#else
 #include <unistd.h>
+#endif
 #include <stdlib.h>
 #include <ctype.h>
 #define GRS_MAX_FIELDS 500 
@@ -68,6 +51,8 @@
 #define sv_undef PL_sv_undef
 #endif
 
+NMEM_MUTEX simpleserver_mutex;
+
 typedef struct {
        SV *handle;
 
@@ -80,8 +65,13 @@ typedef struct {
        SV *esrequest_ref;
        SV *delete_ref;
        SV *scan_ref;
+       SV *explain_ref;
+       NMEM nmem;
+       int stop_flag;  /* is used to stop server prematurely .. */
 } Zfront_handle;
 
+#define ENABLE_STOP_SERVER 0
+
 SV *init_ref = NULL;
 SV *close_ref = NULL;
 SV *sort_ref = NULL;
@@ -91,28 +81,125 @@ SV *present_ref = NULL;
 SV *esrequest_ref = NULL;
 SV *delete_ref = NULL;
 SV *scan_ref = NULL;
+SV *explain_ref = NULL;
+PerlInterpreter *root_perl_context;
 int MAX_OID = 15;
 
+#define GRS_BUF_SIZE 8192
+
+CV * simpleserver_sv2cv(SV *handler) {
+    STRLEN len;
+    char *buf;
+   
+    if (SvPOK(handler)) {
+       CV *ret;
+       buf = SvPV( handler, len);
+       if ( !( ret = perl_get_cv(buf, FALSE ) ) ) {
+           fprintf( stderr, "simpleserver_sv2cv: No such handler '%s'\n\n", buf );
+           exit(1);
+       }
+       
+       return ret;
+    } else {
+       return (CV *) handler;
+    }
+}
+
+/* debugging routine to check for destruction of Perl interpreters */
+#ifdef USE_ITHREADS
+void tst_clones(void)
+{
+    int i; 
+    PerlInterpreter *parent = PERL_GET_CONTEXT;
+    for (i = 0; i<5000; i++)
+    {
+        PerlInterpreter *perl_interp;
+
+       PERL_SET_CONTEXT(parent);
+       PL_perl_destruct_level = 2;
+        perl_interp = perl_clone(parent, CLONEf_CLONE_HOST);
+       PL_perl_destruct_level = 2;
+       PERL_SET_CONTEXT(perl_interp);
+        perl_destruct(perl_interp);
+        perl_free(perl_interp);
+    }
+    exit (0);
+}
+#endif
+
+int simpleserver_clone(void) {
+#ifdef USE_ITHREADS
+     nmem_mutex_enter(simpleserver_mutex);
+     if (1)
+     {
+         PerlInterpreter *current = PERL_GET_CONTEXT;
+
+        /* if current is unset, then we're in a new thread with
+         * no Perl interpreter for it. So we must create one .
+         * This will only happen when threaded is used..
+         */
+         if (!current) {
+             PerlInterpreter *perl_interp;
+             PERL_SET_CONTEXT( root_perl_context );
+             perl_interp = perl_clone(root_perl_context, CLONEf_CLONE_HOST);
+             PERL_SET_CONTEXT( perl_interp );
+         }
+     }
+     nmem_mutex_leave(simpleserver_mutex);
+#endif
+     return 0;
+}
+
+
+void simpleserver_free(void) {
+    nmem_mutex_enter(simpleserver_mutex);
+    if (1)
+    {
+        PerlInterpreter *current_interp = PERL_GET_CONTEXT;
+
+       /* If current Perl Interp is different from root interp, then
+        * we're in threaded mode and we must destroy.. 
+        */
+       if (current_interp != root_perl_context) {
+                   PL_perl_destruct_level = 2;
+            PERL_SET_CONTEXT(current_interp);
+            perl_destruct(current_interp);
+            perl_free(current_interp);
+       }
+    }
+    nmem_mutex_leave(simpleserver_mutex);
+}
+
 
 Z_GenericRecord *read_grs1(char *str, ODR o)
 {
        int type, ivalue;
-       char line[512], *buf, *ptr, *original;
-       char value[512];
+       char line[GRS_BUF_SIZE+1], *buf, *ptr, *original;
+       char value[GRS_BUF_SIZE+1];
        Z_GenericRecord *r = 0;
 
        original = str;
+       r = (Z_GenericRecord *)odr_malloc(o, sizeof(*r));
+       r->elements = (Z_TaggedElement **) odr_malloc(o, sizeof(Z_TaggedElement*) * GRS_MAX_FIELDS);
+       r->num_elements = 0;
+       
        for (;;)
        {
                Z_TaggedElement *t;
                Z_ElementData *c;
+               int len;
        
                ptr = strchr(str, '\n');
                if (!ptr) {
                        return r;
                }
-               strncpy(line, str, ptr - str);
-               line[ptr - str] = 0;
+               len = ptr - str;
+               if (len > GRS_BUF_SIZE) {
+                   yaz_log(YLOG_WARN, "GRS string too long - truncating (%d > %d)", len, GRS_BUF_SIZE);
+                   len = GRS_BUF_SIZE;
+               }
+               strncpy(line, str, len);
+               line[len] = 0;
                buf = line;
                str = ptr + 1;
                while (*buf && isspace(*buf))
@@ -123,28 +210,19 @@ Z_GenericRecord *read_grs1(char *str, ODR o)
                }
                if (sscanf(buf, "(%d,%[^)])", &type, value) != 2)
                {
-                       yaz_log(LOG_WARN, "Bad data in '%s'", buf);
-                       return 0;
+                       yaz_log(YLOG_WARN, "Bad data in '%s'", buf);
+                       return r;
                }
                if (!type && *value == '0')
                        return r;
                if (!(buf = strchr(buf, ')')))
-                       return 0;
+                       return r;
                buf++;
                while (*buf && isspace(*buf))
                        buf++;
-               if (!*buf)
-                       return 0;
-               if (!r)
+               if (r->num_elements >= GRS_MAX_FIELDS)
                {
-                       r = (Z_GenericRecord *)odr_malloc(o, sizeof(*r));
-                       r->elements = (Z_TaggedElement **)
-                       odr_malloc(o, sizeof(Z_TaggedElement*) * GRS_MAX_FIELDS);
-                       r->num_elements = 0;
-               }
-               if (r->num_elements > GRS_MAX_FIELDS)
-               {
-                       yaz_log(LOG_WARN, "Max number of GRS-1 elements exceeded [GRS_MAX_FIELDS=%d]", GRS_MAX_FIELDS);
+                       yaz_log(YLOG_WARN, "Max number of GRS-1 elements exceeded [GRS_MAX_FIELDS=%d]", GRS_MAX_FIELDS);
                        exit(0);
                }
                r->elements[r->num_elements] = t = (Z_TaggedElement *) odr_malloc(o, sizeof(Z_TaggedElement));
@@ -176,8 +254,6 @@ Z_GenericRecord *read_grs1(char *str, ODR o)
                else
                {
                        c->which = Z_ElementData_string;
-/*                     buf[strlen(buf)-1] = '\0';*/
-                       buf[strlen(buf)] = '\0';
                        c->u.string = odr_strdup(o, buf);
                }
                r->num_elements++;
@@ -199,83 +275,289 @@ static void oid2str(Odr_oid *o, WRBUF buf)
 }
 
 
-static int rpn2pquery(Z_RPNStructure *s, WRBUF buf)
+WRBUF zquery2pquery(Z_Query *q)
+{
+    WRBUF buf = wrbuf_alloc();
+
+    if (q->which != Z_Query_type_1 && q->which != Z_Query_type_101) 
+       return 0;
+    yaz_rpnquery_to_wrbuf(buf, q->u.type_1);
+    return buf;
+}
+
+
+/* Lifted verbatim from Net::Z3950 yazwrap/util.c */
+#include <stdarg.h>
+void fatal(char *fmt, ...)
+{
+    va_list ap;
+
+    fprintf(stderr, "FATAL (SimpleServer): ");
+    va_start(ap, fmt);
+    vfprintf(stderr, fmt, ap);
+    va_end(ap);
+    fprintf(stderr, "\n");
+    abort();
+}
+
+
+/* Lifted verbatim from Net::Z3950 yazwrap/receive.c */
+/*
+ * Creates a new Perl object of type `class'; the newly-created scalar
+ * that is a reference to the blessed thingy `referent' is returned.
+ */
+static SV *newObject(char *class, SV *referent)
+{
+    HV *stash;
+    SV *sv;
+
+    sv = newRV_noinc((SV*) referent);
+    stash = gv_stashpv(class, 0);
+    if (stash == 0)
+       fatal("attempt to create object of undefined class '%s'", class);
+    /*assert(stash != 0);*/
+    sv_bless(sv, stash);
+    return sv;
+}
+
+
+/* Lifted verbatim from Net::Z3950 yazwrap/receive.c */
+static void setMember(HV *hv, char *name, SV *val)
+{
+    /* We don't increment `val's reference count -- I think this is
+     * right because it's created with a refcount of 1, and in fact
+     * the reference via this hash is the only reference to it in
+     * general.
+     */
+    if (!hv_store(hv, name, (U32) strlen(name), val, (U32) 0))
+       fatal("couldn't store member in hash");
+}
+
+
+/* Lifted verbatim from Net::Z3950 yazwrap/receive.c */
+static SV *translateOID(Odr_oid *x)
+{
+    /* Yaz represents an OID by an int array terminated by a negative
+     * value, typically -1; we represent it as a reference to a
+     * blessed scalar string of "."-separated elements.
+     */
+    char buf[1000];
+    int i;
+
+    *buf = '\0';
+    for (i = 0; x[i] >= 0; i++) {
+       sprintf(buf + strlen(buf), "%d", (int) x[i]);
+       if (x[i+1] >- 0)
+           strcat(buf, ".");
+    }
+
+    /*
+     * ### We'd like to return a blessed scalar (string) here, but of
+     * course you can't do that in Perl: only references can be
+     * blessed, so we'd have to return a _reference_ to a string, and
+     * bless _that_.  Better to do without the blessing, I think.
+     */
+    if (1) {
+       return newSVpv(buf, 0);
+    } else {
+       return newObject("Net::Z3950::APDU::OID", newSVpv(buf, 0));
+    }
+}
+
+
+static SV *rpn2perl(Z_RPNStructure *s)
 {
+    SV *sv;
+    HV *hv;
+    AV *av;
+
     switch (s->which) {
-       case Z_RPNStructure_simple: {
-           Z_Operand *o = s->u.simple;
-
-           switch (o->which) {
-               case Z_Operand_APT: {
-                   Z_AttributesPlusTerm *at = o->u.attributesPlusTerm;
-
-                   if (at->attributes) {
-                       int i;
-                       char ibuf[16];
-
-                       for (i = 0; i < at->attributes->num_attributes; i++) {
-                           wrbuf_puts(buf, "@attr ");
-                           if (at->attributes->attributes[i]->attributeSet) {
-                               oid2str(at->attributes->attributes[i]->attributeSet, buf);
-                               wrbuf_putc(buf, ' ');
-                           }
-                           sprintf(ibuf, "%d=", *at->attributes->attributes[i]->attributeType);
-                           assert(at->attributes->attributes[i]->which == Z_AttributeValue_numeric);
-                           wrbuf_puts(buf, ibuf);
-                           sprintf(ibuf, "%d ", *at->attributes->attributes[i]->value.numeric);
-                           wrbuf_puts(buf, ibuf);
-                       }
-                   }
-                   switch (at->term->which) {
-                       case Z_Term_general: {
-                           wrbuf_putc(buf, '"');
-                           wrbuf_write(buf, (char*) at->term->u.general->buf, at->term->u.general->len);
-                           wrbuf_puts(buf, "\" ");
-                           break;
-                       }
-                       default: abort();
-                   }
-                   break;
-               }
-               default: abort();
-           }
-           break;
+    case Z_RPNStructure_simple: {
+       Z_Operand *o = s->u.simple;
+       Z_AttributesPlusTerm *at;
+       if (o->which == Z_Operand_resultSetId) {
+           SV *sv2;
+           /* This code causes a SIGBUS on my machine, and I have no
+              idea why.  It seems as clear as day to me */
+           char *rsid = (char*) o->u.resultSetId;
+           printf("Encoding resultSetId '%s'\n", rsid);
+           sv = newObject("Net::Z3950::RPN::RSID", (SV*) (hv = newHV()));
+           printf("Made sv=0x%lx, hv=0x%lx\n",
+                  (unsigned long) sv ,(unsigned long) hv);
+           sv2 = newSVpv(rsid, strlen(rsid));
+           setMember(hv, "id", sv2);
+           printf("Set hv{id} to 0x%lx\n", (unsigned long) sv2);
+           return sv;
        }
-       case Z_RPNStructure_complex: {
-           Z_Complex *c = s->u.complex;
-
-           switch (c->roperator->which) {
-               case Z_Operator_and: wrbuf_puts(buf, "@and "); break;
-               case Z_Operator_or: wrbuf_puts(buf, "@or "); break;
-               case Z_Operator_and_not: wrbuf_puts(buf, "@not "); break;
-               case Z_Operator_prox: abort();
-               default: abort();
+       if (o->which != Z_Operand_APT)
+           fatal("can't handle RPN simples other than APT and RSID");
+       at = o->u.attributesPlusTerm;
+       if (at->term->which != Z_Term_general)
+           fatal("can't handle RPN terms other than general");
+
+       sv = newObject("Net::Z3950::RPN::Term", (SV*) (hv = newHV()));
+       if (at->attributes) {
+           int i;
+           SV *attrs = newObject("Net::Z3950::RPN::Attributes",
+                                 (SV*) (av = newAV()));
+           for (i = 0; i < at->attributes->num_attributes; i++) {
+               Z_AttributeElement *elem = at->attributes->attributes[i];
+               HV *hv2;
+               SV *tmp = newObject("Net::Z3950::RPN::Attribute",
+                                   (SV*) (hv2 = newHV()));
+               if (elem->attributeSet)
+                   setMember(hv2, "attributeSet",
+                             translateOID(elem->attributeSet));
+               setMember(hv2, "attributeType",
+                         newSViv(*elem->attributeType));
+               assert(elem->which == Z_AttributeValue_numeric);
+               setMember(hv2, "attributeValue",
+                         newSViv(*elem->value.numeric));
+               av_push(av, tmp);
            }
-           if (!rpn2pquery(c->s1, buf))
-               return 0;
-           if (!rpn2pquery(c->s2, buf))
-               return 0;
-           break;
+           setMember(hv, "attributes", attrs);
+       }
+       setMember(hv, "term", newSVpv((char*) at->term->u.general->buf,
+                                     at->term->u.general->len));
+       return sv;
+    }
+    case Z_RPNStructure_complex: {
+       SV *tmp;
+       Z_Complex *c = s->u.complex;
+       char *type = 0;         /* vacuous assignment satisfies gcc -Wall */
+       switch (c->roperator->which) {
+       case Z_Operator_and:     type = "Net::Z3950::RPN::And"; break;
+       case Z_Operator_or:      type = "Net::Z3950::RPN::Or"; break;
+       case Z_Operator_and_not: type = "Net::Z3950::RPN::AndNot"; break;
+       case Z_Operator_prox:    fatal("proximity not yet supported");
+       default: fatal("unknown RPN operator %d", (int) c->roperator->which);
        }
-       default: abort();
+       sv = newObject(type, (SV*) (av = newAV()));
+       if ((tmp = rpn2perl(c->s1)) == 0)
+           return 0;
+       av_push(av, tmp);
+       if ((tmp = rpn2perl(c->s2)) == 0)
+           return 0;
+       av_push(av, tmp);
+       return sv;
     }
+    default: fatal("unknown RPN node type %d", (int) s->which);
+    }
+
+    return 0;
+}
+
+
+/* Decode the Z_SortAttributes struct and store the whole thing into the
+ * hash by reference
+ */
+int simpleserver_ExpandSortAttributes (HV *sort_spec, Z_SortAttributes *sattr)
+{
+    WRBUF attrset_wr = wrbuf_alloc();
+    AV *list = newAV();
+    Z_AttributeList *attr_list = sattr->list;
+    int i;
+
+    oid2str(sattr->id, attrset_wr);
+    hv_store(sort_spec, "ATTRSET", 7,
+             newSVpv(attrset_wr->buf, attrset_wr->pos), 0);
+    wrbuf_destroy(attrset_wr);
+
+    hv_store(sort_spec, "SORT_ATTR", 9, newRV( sv_2mortal( (SV*) list ) ), 0);
+
+    for (i = 0; i < attr_list->num_attributes; i++) 
+    {
+        Z_AttributeElement *attr = *attr_list->attributes++; 
+        HV *attr_spec = newHV();
+                
+        av_push(list, newRV( sv_2mortal( (SV*) attr_spec ) ));
+        hv_store(attr_spec, "ATTR_TYPE", 9, newSViv(*attr->attributeType), 0);
+
+        if (attr->which == Z_AttributeValue_numeric)
+        {
+            hv_store(attr_spec, "ATTR_VALUE", 10,
+                     newSViv(*attr->value.numeric), 0);
+        } else {
+            return 0;
+        }
+    }
+
     return 1;
 }
 
 
-WRBUF zquery2pquery(Z_Query *q)
+/* Decode the Z_SortKeySpec struct and store the whole thing in a perl hash */
+int simpleserver_SortKeySpecToHash (HV *sort_spec, Z_SortKeySpec *spec)
 {
-    WRBUF buf = wrbuf_alloc();
+    Z_SortElement *element = spec->sortElement;
+
+    hv_store(sort_spec, "RELATION", 8, newSViv(*spec->sortRelation), 0);
+    hv_store(sort_spec, "CASE", 4, newSViv(*spec->caseSensitivity), 0);
+    hv_store(sort_spec, "MISSING", 7, newSViv(spec->which), 0);
+
+    if (element->which == Z_SortElement_generic)
+    {
+        Z_SortKey *key = element->u.generic;
+
+        if (key->which == Z_SortKey_sortField)
+        {
+            hv_store(sort_spec, "SORTFIELD", 9,
+                     newSVpv((char *) key->u.sortField, 0), 0);
+        }
+        else if (key->which == Z_SortKey_elementSpec)
+        {
+            Z_Specification *zspec = key->u.elementSpec;
+            
+            hv_store(sort_spec, "ELEMENTSPEC_TYPE", 16,
+                     newSViv(zspec->which), 0);
+
+            if (zspec->which == Z_Schema_oid)
+            {
+                WRBUF elementSpec = wrbuf_alloc();
+
+                oid2str(zspec->schema.oid, elementSpec);
+                hv_store(sort_spec, "ELEMENTSPEC_VALUE", 17,
+                         newSVpv(elementSpec->buf, elementSpec->pos), 0);
+                wrbuf_destroy(elementSpec);
+            }
+            else if (zspec->which == Z_Schema_uri)
+            {
+                hv_store(sort_spec, "ELEMENTSPEC_VALUE", 17,
+                         newSVpv((char *) zspec->schema.uri, 0), 0);
+            }
+        }
+        else if (key->which == Z_SortKey_sortAttributes)
+        {
+            return simpleserver_ExpandSortAttributes(sort_spec,
+                                                     key->u.sortAttributes);
+        }
+        else
+        {
+            return 0;
+        }
+    }
+    else
+    {
+        return 0;
+    }
+
+    return 1;
+}
+
+
+static SV *zquery2perl(Z_Query *q)
+{
+    SV *sv;
+    HV *hv;
 
     if (q->which != Z_Query_type_1 && q->which != Z_Query_type_101) 
        return 0;
-    if (q->u.type_1->attributeSetId) {
-       /* Output attribute set ID */
-       wrbuf_puts(buf, "@attrset ");
-       oid2str(q->u.type_1->attributeSetId, buf);
-       wrbuf_putc(buf, ' ');
-    }
-    return rpn2pquery(q->u.type_1->RPNStructure, buf) ? buf : 0;
+    sv = newObject("Net::Z3950::APDU::Query", (SV*) (hv = newHV()));
+    if (q->u.type_1->attributeSetId)
+       setMember(hv, "attributeSet",
+                 translateOID(q->u.type_1->attributeSetId));
+    setMember(hv, "query", rpn2perl(q->u.type_1->RPNStructure));
+    return sv;
 }
 
 
@@ -283,15 +565,18 @@ int bend_sort(void *handle, bend_sort_rr *rr)
 {
        HV *href;
        AV *aref;
+        AV *sort_seq;
        SV **temp;
        SV *err_code;
        SV *err_str;
        SV *status;
+        SV *point;
        STRLEN len;
        char *ptr;
        char *ODR_err_str;
        char **input_setnames;
        Zfront_handle *zhandle = (Zfront_handle *)handle;
+        Z_SortKeySpecList *sort_spec = rr->sort_sequence;
        int i;
        
        dSP;
@@ -302,13 +587,32 @@ int bend_sort(void *handle, bend_sort_rr *rr)
        input_setnames = rr->input_setnames;
        for (i = 0; i < rr->num_input_setnames; i++)
        {
-               av_push(aref, newSVpv(*input_setnames++, 0));
+            av_push(aref, newSVpv(*input_setnames++, 0));
        }
+
+        sort_seq = newAV();
+        for (i = 0; i < sort_spec->num_specs; i++)
+        {
+            Z_SortKeySpec *spec = *sort_spec->specs++;
+            HV *sort_spec = newHV();
+
+            if ( simpleserver_SortKeySpecToHash(sort_spec, spec) )
+                av_push(sort_seq, newRV( sv_2mortal( (SV*) sort_spec ) ));
+            else
+            {
+                rr->errcode = 207;
+                return 0;
+            }
+        }
+        
        href = newHV();
        hv_store(href, "INPUT", 5, newRV( (SV*) aref), 0);
        hv_store(href, "OUTPUT", 6, newSVpv(rr->output_setname, 0), 0);
+        hv_store(href, "SEQUENCE", 8, newRV( (SV*) sort_seq), 0);
        hv_store(href, "HANDLE", 6, zhandle->handle, 0);
        hv_store(href, "STATUS", 6, newSViv(0), 0);
+        hv_store(href, "ERR_CODE", 8, newSViv(0), 0);
+        hv_store(href, "ERR_STR", 7, newSVpv("", 0), 0);
 
        PUSHMARK(sp);
 
@@ -329,26 +633,34 @@ int bend_sort(void *handle, bend_sort_rr *rr)
        temp = hv_fetch(href, "STATUS", 6, 1);
        status = newSVsv(*temp);
 
+        temp = hv_fetch(href, "HANDLE", 6, 1);
+        point = newSVsv(*temp);
 
-       
-
-       PUTBACK;
-       FREETMPS;
-       LEAVE;
-
-       hv_undef(href),
+       hv_undef(href);
        av_undef(aref);
+        av_undef(sort_seq);
+       
+       sv_free( (SV*) aref);
+       sv_free( (SV*) href);
+       sv_free( (SV*) sort_seq);
+
        rr->errcode = SvIV(err_code);
        rr->sort_status = SvIV(status);
+        
        ptr = SvPV(err_str, len);
        ODR_err_str = (char *)odr_malloc(rr->stream, len + 1);
        strcpy(ODR_err_str, ptr);
        rr->errstring = ODR_err_str;
+        zhandle->handle = point;
 
        sv_free(err_code);
        sv_free(err_str);
        sv_free(status);
        
+        PUTBACK;
+       FREETMPS;
+       LEAVE;
+
        return 0;
 }
 
@@ -358,19 +670,16 @@ int bend_search(void *handle, bend_search_rr *rr)
        HV *href;
        AV *aref;
        SV **temp;
-       SV *hits;
-       SV *err_code;
-       SV *err_str;
        char *ODR_errstr;
        STRLEN len;
        int i;
        char **basenames;
-       int n;
        WRBUF query;
        char *ptr;
        SV *point;
-       SV *ODR_point;
        Zfront_handle *zhandle = (Zfront_handle *)handle;
+       CV* handler_cv = 0;
+       SV *rpnSV;
 
        dSP;
        ENTER;
@@ -382,8 +691,16 @@ int bend_search(void *handle, bend_search_rr *rr)
        {
                av_push(aref, newSVpv(*basenames++, 0));
        }
+#if ENABLE_STOP_SERVER
+       if (rr->num_bases == 1 && !strcmp(rr->basenames[0], "XXstop"))
+       {
+               zhandle->stop_flag = 1;
+       }
+#endif
        href = newHV();         
        hv_store(href, "SETNAME", 7, newSVpv(rr->setname, 0), 0);
+       if (rr->srw_sortKeys && *rr->srw_sortKeys) 
+           hv_store(href, "SRW_SORTKEYS", 12, newSVpv(rr->srw_sortKeys, 0), 0);
        hv_store(href, "REPL_SET", 8, newSViv(rr->replace_set), 0);
        hv_store(href, "ERR_CODE", 8, newSViv(0), 0);
        hv_store(href, "ERR_STR", 7, newSVpv("", 0), 0);
@@ -391,14 +708,23 @@ int bend_search(void *handle, bend_search_rr *rr)
        hv_store(href, "DATABASES", 9, newRV( (SV*) aref), 0);
        hv_store(href, "HANDLE", 6, zhandle->handle, 0);
        hv_store(href, "PID", 3, newSViv(getpid()), 0);
+       if ((rpnSV = zquery2perl(rr->query)) != 0) {
+           hv_store(href, "RPN", 3, rpnSV, 0);
+       }
        query = zquery2pquery(rr->query);
        if (query)
        {
                hv_store(href, "QUERY", 5, newSVpv((char *)query->buf, query->pos), 0);
        }
+       else if (rr->query->which == Z_Query_type_104 &&
+                rr->query->u.type_104->which == Z_External_CQL) {
+           hv_store(href, "CQL", 3,
+                    newSVpv(rr->query->u.type_104->u.cql, 0), 0);
+       }
        else
        {       
                rr->errcode = 108;
+               return 0;
        }
        PUSHMARK(sp);
        
@@ -406,50 +732,42 @@ int bend_search(void *handle, bend_search_rr *rr)
        
        PUTBACK;
 
-       n = perl_call_sv(search_ref, G_SCALAR | G_DISCARD);
+       handler_cv = simpleserver_sv2cv( search_ref );
+       perl_call_sv( (SV *) handler_cv, G_SCALAR | G_DISCARD);
 
        SPAGAIN;
 
        temp = hv_fetch(href, "HITS", 4, 1);
-       hits = newSVsv(*temp);
+       rr->hits = SvIV(*temp);
 
        temp = hv_fetch(href, "ERR_CODE", 8, 1);
-       err_code = newSVsv(*temp);
+       rr->errcode = SvIV(*temp);
 
        temp = hv_fetch(href, "ERR_STR", 7, 1);
-       err_str = newSVsv(*temp);
+       ptr = SvPV(*temp, len);
+       ODR_errstr = (char *)odr_malloc(rr->stream, len + 1);
+       strcpy(ODR_errstr, ptr);
+       rr->errstring = ODR_errstr;
 
        temp = hv_fetch(href, "HANDLE", 6, 1);
        point = newSVsv(*temp);
 
-       PUTBACK;
-       FREETMPS;
-       LEAVE;
-       
        hv_undef(href);
        av_undef(aref);
-       rr->hits = SvIV(hits);
-       rr->errcode = SvIV(err_code);
-       ptr = SvPV(err_str, len);
-       ODR_errstr = (char *)odr_malloc(rr->stream, len + 1);
-       strcpy(ODR_errstr, ptr);
-       rr->errstring = ODR_errstr;
-/*     ODR_point = (SV *)odr_malloc(rr->stream, sizeof(*point));
-       memcpy(ODR_point, point, sizeof(*point));
-       zhandle->handle = ODR_point;*/
+
        zhandle->handle = point;
-       handle = zhandle;
-       sv_free(hits);
-       sv_free(err_code);
-       sv_free(err_str);
        sv_free( (SV*) aref);
        sv_free( (SV*) href);
-       /*sv_free(point);*/
-       wrbuf_free(query, 1);
+       if (query)
+           wrbuf_destroy(query);
+       PUTBACK;
+       FREETMPS;
+       LEAVE;
        return 0;
 }
 
 
+/* ### this is worryingly similar to oid2str() */
 WRBUF oid2dotted(int *oid)
 {
 
@@ -473,47 +791,6 @@ WRBUF oid2dotted(int *oid)
        return buf;
 }
                
-
-int dotted2oid(char *dotted, int *buffer)
-{
-        int *oid;
-        char ibuf[16];
-        char *ptr;
-        int n = 0;
-
-        ptr = ibuf;
-        oid = buffer;
-        while (*dotted)
-        {
-                if (*dotted == '.')
-                {
-                        n++;
-                       if (n == MAX_OID)  /* Terminate if more than MAX_OID entries */
-                       {
-                               *oid = -1;
-                               return -1;
-                       }
-                        *ptr = 0;
-                        sscanf(ibuf, "%d", oid++);
-                        ptr = ibuf;
-                        dotted++;
-
-                }
-                else
-                {
-                        *ptr++ = *dotted++;
-                }
-        }
-        if (n < MAX_OID)
-       {
-               *ptr = 0;
-               sscanf(ibuf, "%d", oid++);
-       }
-        *oid = -1;
-       return 0;
-}
-
-
 int bend_fetch(void *handle, bend_fetch_rr *rr)
 {
        HV *href;
@@ -526,17 +803,19 @@ int bend_fetch(void *handle, bend_fetch_rr *rr)
        SV *sur_flag;
        SV *point;
        SV *rep_form;
+       SV *schema = 0;
        char *ptr;
        char *ODR_record;
        char *ODR_basename;
        char *ODR_errstr;
        int *ODR_oid_buf;
-       oident *oid;
        WRBUF oid_dotted;
        Zfront_handle *zhandle = (Zfront_handle *)handle;
+       CV* handler_cv = 0;
 
        Z_RecordComposition *composition;
        Z_ElementSetNames *simple;
+       Z_CompSpec *complex;
        STRLEN length;
 
        dSP;
@@ -546,8 +825,16 @@ int bend_fetch(void *handle, bend_fetch_rr *rr)
        rr->errcode = 0;
        href = newHV();
        hv_store(href, "SETNAME", 7, newSVpv(rr->setname, 0), 0);
+       if (rr->schema)
+               hv_store(href, "SCHEMA", 6, newSVpv(rr->schema, 0), 0);
        temp = hv_store(href, "OFFSET", 6, newSViv(rr->number), 0);
-       oid_dotted = oid2dotted(rr->request_format_raw);
+       if (rr->request_format != 0) {
+           oid_dotted = oid2dotted(rr->request_format);
+       } else {
+           /* Probably an SRU request: assume XML is required */
+           oid_dotted = wrbuf_alloc();
+           wrbuf_puts(oid_dotted, "1.2.840.10003.5.109.10");
+       }
        hv_store(href, "REQ_FORM", 8, newSVpv((char *)oid_dotted->buf, oid_dotted->pos), 0);
        hv_store(href, "REP_FORM", 8, newSVpv((char *)oid_dotted->buf, oid_dotted->pos), 0);
        hv_store(href, "BASENAME", 8, newSVpv("", 0), 0);
@@ -573,9 +860,32 @@ int bend_fetch(void *handle, bend_fetch_rr *rr)
                                rr->errcode = 26;
                        }
                }
+               else if (composition->which == Z_RecordComp_complex)
+               {
+                       if (composition->u.complex->generic &&
+
+                                       composition->u.complex->generic &&
+                                       composition->u.complex->generic->elementSpec &&
+                                       composition->u.complex->generic->elementSpec->which ==
+                                       Z_ElementSpec_elementSetName)
+                       {
+                               complex = composition->u.complex;
+                               hv_store(href, "COMP", 4,
+                                       newSVpv(complex->generic->elementSpec->u.elementSetName, 0), 0);
+                       }
+                       else
+                       {
+#if 0  /* For now ignore this error, which is ubiquitous in SRU */
+                               fprintf(stderr, "complex is weird\n");
+                               rr->errcode = 26;
+                               return 0;
+#endif /*0*/
+                       }
+               }
                else
                {
                        rr->errcode = 26;
+                       return 0;
                }
        }
 
@@ -585,7 +895,8 @@ int bend_fetch(void *handle, bend_fetch_rr *rr)
 
        PUTBACK;
        
-       perl_call_sv(fetch_ref, G_SCALAR | G_DISCARD);
+       handler_cv = simpleserver_sv2cv( fetch_ref );
+       perl_call_sv( (SV *) handler_cv, G_SCALAR | G_DISCARD);
 
        SPAGAIN;
 
@@ -610,12 +921,19 @@ int bend_fetch(void *handle, bend_fetch_rr *rr)
        temp = hv_fetch(href, "REP_FORM", 8, 1);
        rep_form = newSVsv(*temp);
 
+       temp = hv_fetch(href, "SCHEMA", 6, 1);
+       if (temp != 0) {
+               schema = newSVsv(*temp);
+               ptr = SvPV(schema, length);
+               if (length > 0) {
+                       rr->schema = (char *)odr_malloc(rr->stream, length + 1);
+                       strcpy(rr->schema, ptr);
+               }
+       }
+
        temp = hv_fetch(href, "HANDLE", 6, 1);
        point = newSVsv(*temp);
 
-       PUTBACK;
-       FREETMPS;
-       LEAVE;
 
        hv_undef(href);
        
@@ -625,16 +943,17 @@ int bend_fetch(void *handle, bend_fetch_rr *rr)
        rr->basename = ODR_basename;
 
        ptr = SvPV(rep_form, length);
+
        ODR_oid_buf = (int *)odr_malloc(rr->stream, (MAX_OID + 1) * sizeof(int));
-       if (dotted2oid(ptr, ODR_oid_buf) == -1)         /* Maximum number of OID elements exceeded */
+       if (oid_dotstring_to_oid(ptr, ODR_oid_buf))
        {
                printf("Net::Z3950::SimpleServer: WARNING: OID structure too long, max length is %d\n", MAX_OID);
        }
-       rr->output_format_raw = ODR_oid_buf;    
+       rr->output_format = ODR_oid_buf;        
        
        ptr = SvPV(record, length);
-       oid = oid_getentbyoid(ODR_oid_buf);
-       if (oid->value == VAL_GRS1)             /* Treat GRS-1 records separately */
+        /* Treat GRS-1 records separately */
+       if (!oid_oidcmp(ODR_oid_buf, yaz_oid_recsyn_grs_1))
        {
                rr->record = (char *) read_grs1(ptr, rr->stream);
                rr->len = -1;
@@ -660,7 +979,7 @@ int bend_fetch(void *handle, bend_fetch_rr *rr)
        }
        rr->surrogate_flag = SvIV(sur_flag);
 
-       wrbuf_free(oid_dotted, 1);
+       wrbuf_destroy(oid_dotted);
        sv_free((SV*) href);
        sv_free(basename);
        sv_free(record);
@@ -669,6 +988,13 @@ int bend_fetch(void *handle, bend_fetch_rr *rr)
        sv_free(err_code),
        sv_free(sur_flag);
        sv_free(rep_form);
+
+       if (schema)
+               sv_free(schema);
+
+       PUTBACK;
+       FREETMPS;
+       LEAVE;
        
        return 0;
 }
@@ -676,7 +1002,6 @@ int bend_fetch(void *handle, bend_fetch_rr *rr)
 
 int bend_present(void *handle, bend_present_rr *rr)
 {
-
        HV *href;
        SV **temp;
        SV *err_code;
@@ -686,9 +1011,11 @@ int bend_present(void *handle, bend_present_rr *rr)
        STRLEN len;
        Z_RecordComposition *composition;
        Z_ElementSetNames *simple;
+       Z_CompSpec *complex;
        char *ODR_errstr;
        char *ptr;
        Zfront_handle *zhandle = (Zfront_handle *)handle;
+       CV* handler_cv = 0;
 
 /*     WRBUF oid_dotted; */
 
@@ -723,6 +1050,25 @@ int bend_present(void *handle, bend_present_rr *rr)
                                return 0;
                        }
                }
+               else if (composition->which == Z_RecordComp_complex)
+               {
+                       if (composition->u.complex->generic &&
+
+                                       composition->u.complex->generic &&
+                                       composition->u.complex->generic->elementSpec &&
+                                       composition->u.complex->generic->elementSpec->which ==
+                                       Z_ElementSpec_elementSetName)
+                       {
+                               complex = composition->u.complex;
+                               hv_store(href, "COMP", 4,
+                                       newSVpv(complex->generic->elementSpec->u.elementSetName, 0), 0);
+                       }
+                       else
+                       {
+                               rr->errcode = 26;
+                               return 0;
+                       }
+               }
                else
                {
                        rr->errcode = 26;
@@ -736,7 +1082,8 @@ int bend_present(void *handle, bend_present_rr *rr)
        
        PUTBACK;
        
-       perl_call_sv(present_ref, G_SCALAR | G_DISCARD);
+       handler_cv = simpleserver_sv2cv( present_ref );
+       perl_call_sv( (SV *) handler_cv, G_SCALAR | G_DISCARD);
        
        SPAGAIN;
 
@@ -812,10 +1159,9 @@ int bend_scan(void *handle, bend_scan_rr *rr)
        char *ODR_errstr;
        STRLEN len;
        int term_len;
-       SV *term_tmp;
        SV *entries_ref;
-       
        Zfront_handle *zhandle = (Zfront_handle *)handle;
+       CV* handler_cv = 0;
 
        dSP;
        ENTER;
@@ -825,7 +1171,7 @@ int bend_scan(void *handle, bend_scan_rr *rr)
        if (rr->term->term->which == Z_Term_general)
        {
                term_len = rr->term->term->u.general->len;
-               hv_store(href, "TERM", 4, newSVpv(rr->term->term->u.general->buf, term_len), 0);
+               hv_store(href, "TERM", 4, newSVpv((char*) rr->term->term->u.general->buf, term_len), 0);
        } else {
                rr->errcode = 229;      /* Unsupported term type */
                return 0;
@@ -852,7 +1198,8 @@ int bend_scan(void *handle, bend_scan_rr *rr)
 
        PUTBACK;
 
-       perl_call_sv(scan_ref, G_SCALAR | G_DISCARD);
+       handler_cv = simpleserver_sv2cv( scan_ref );
+       perl_call_sv( (SV *) handler_cv, G_SCALAR | G_DISCARD);
 
        SPAGAIN;
 
@@ -920,29 +1267,74 @@ int bend_scan(void *handle, bend_scan_rr *rr)
         return 0;
 }
 
-
-bend_initresult *bend_init(bend_initrequest *q)
+int bend_explain(void *handle, bend_explain_rr *q)
 {
-       bend_initresult *r = (bend_initresult *) odr_malloc (q->stream, sizeof(*r));
        HV *href;
+       CV *handler_cv = 0;
        SV **temp;
-       SV *name;
-       SV *ver;
-       SV *err_str;
-       SV *status;
-       Zfront_handle *zhandle =  (Zfront_handle *) xmalloc (sizeof(*zhandle));
+       char *explain;
+       SV *explainsv;
        STRLEN len;
-       int n;
-       SV *handle;
-       /*char *name_ptr;
-       char *ver_ptr;*/
-       char *ptr;
+       Zfront_handle *zhandle = (Zfront_handle *)handle;
+
+       dSP;
+       ENTER;
+       SAVETMPS;
+
+       href = newHV();
+       hv_store(href, "EXPLAIN", 7, newSVpv("", 0), 0);
+       hv_store(href, "DATABASE", 8, newSVpv(q->database, 0), 0);
+       hv_store(href, "HANDLE", 6, zhandle->handle, 0);
+
+       PUSHMARK(sp);
+       XPUSHs(sv_2mortal(newRV((SV*) href)));
+       PUTBACK;
+
+       handler_cv = simpleserver_sv2cv(explain_ref);
+       perl_call_sv((SV*) handler_cv, G_SCALAR | G_DISCARD);
 
+       SPAGAIN;
+
+       temp = hv_fetch(href, "EXPLAIN", 7, 1);
+       explainsv = newSVsv(*temp);
+
+       PUTBACK;
+       FREETMPS;
+       LEAVE;
+
+       explain = SvPV(explainsv, len);
+       q->explain_buf = (char*) odr_malloc(q->stream, len + 1);
+       strcpy(q->explain_buf, explain);
+
+        return 0;
+}
+
+bend_initresult *bend_init(bend_initrequest *q)
+{
+       int dummy = simpleserver_clone();
+       bend_initresult *r = (bend_initresult *)
+               odr_malloc (q->stream, sizeof(*r));
+       char *ptr;
+       CV* handler_cv = 0;
        dSP;
+       STRLEN len;
+       NMEM nmem = nmem_create();
+       Zfront_handle *zhandle =  (Zfront_handle *) nmem_malloc (nmem,
+                       sizeof(*zhandle));
+       SV *handle;
+       HV *href;
+       SV **temp;
+
        ENTER;
        SAVETMPS;
 
-       /*q->bend_sort = bend_sort;*/
+       zhandle->nmem = nmem;
+       zhandle->stop_flag = 0;
+
+        if (sort_ref)
+        {
+            q->bend_sort = bend_sort;
+        }
        if (search_ref)
        {
                q->bend_search = bend_search;
@@ -961,98 +1353,141 @@ bend_initresult *bend_init(bend_initrequest *q)
        {
                q->bend_scan = bend_scan;
        }
+       if (explain_ref)
+       {
+               q->bend_explain = bend_explain;
+       }
+
                href = newHV(); 
+       hv_store(href, "IMP_ID", 6, newSVpv("", 0), 0);
        hv_store(href, "IMP_NAME", 8, newSVpv("", 0), 0);
        hv_store(href, "IMP_VER", 7, newSVpv("", 0), 0);
        hv_store(href, "ERR_CODE", 8, newSViv(0), 0);
+       hv_store(href, "ERR_STR", 7, newSViv(0), 0);
        hv_store(href, "PEER_NAME", 9, newSVpv(q->peer_name, 0), 0);
        hv_store(href, "HANDLE", 6, newSVsv(&sv_undef), 0);
        hv_store(href, "PID", 3, newSViv(getpid()), 0);
+       if (q->auth) {
+           char *user = NULL;
+           char *passwd = NULL;
+           if (q->auth->which == Z_IdAuthentication_open) {
+                char *cp;
+               user = nmem_strdup (odr_getmem (q->stream), q->auth->u.open);
+               cp = strchr (user, '/');
+               if (cp) {
+                    /* password after / given */
+                   *cp = '\0';
+                   passwd = cp+1;
+               }
+           } else if (q->auth->which == Z_IdAuthentication_idPass) {
+               user = q->auth->u.idPass->userId;
+               passwd = q->auth->u.idPass->password;
+           }
+           /* ### some code paths have user/password unassigned here */
+            if (user)
+               hv_store(href, "USER", 4, newSVpv(user, 0), 0);
+            if (passwd)
+               hv_store(href, "PASS", 4, newSVpv(passwd, 0), 0);
+       }
 
        PUSHMARK(sp);   
 
-       XPUSHs(sv_2mortal(newRV( (SV*) href)));
+       XPUSHs(sv_2mortal(newRV((SV*) href)));
 
        PUTBACK;
 
        if (init_ref != NULL)
        {
-               perl_call_sv(init_ref, G_SCALAR | G_DISCARD);
+            handler_cv = simpleserver_sv2cv( init_ref );
+            perl_call_sv( (SV *) handler_cv, G_SCALAR | G_DISCARD);
        }
 
        SPAGAIN;
 
+       temp = hv_fetch(href, "IMP_ID", 6, 1);
+       ptr = SvPV(*temp, len);
+       q->implementation_id = nmem_strdup(nmem, ptr);
+
        temp = hv_fetch(href, "IMP_NAME", 8, 1);
-       name = newSVsv(*temp);
+       ptr = SvPV(*temp, len);
+       q->implementation_name = nmem_strdup(nmem, ptr);
 
        temp = hv_fetch(href, "IMP_VER", 7, 1);
-       ver = newSVsv(*temp);
+       ptr = SvPV(*temp, len);
+       q->implementation_version = nmem_strdup(nmem, ptr);
 
        temp = hv_fetch(href, "ERR_CODE", 8, 1);
-       status = newSVsv(*temp);
+       r->errcode = SvIV(*temp);
+
+       temp = hv_fetch(href, "ERR_STR", 7, 1);
+       ptr = SvPV(*temp, len);
+       r->errstring = (char *)odr_malloc(q->stream, len + 1);
+       strcpy(r->errstring, ptr);
 
        temp = hv_fetch(href, "HANDLE", 6, 1);
        handle= newSVsv(*temp);
+       zhandle->handle = handle;
+
+       r->handle = zhandle;
 
        hv_undef(href);
+       sv_free((SV*) href);
+
        PUTBACK;
        FREETMPS;
        LEAVE;
-       zhandle->handle = handle;
-       r->errcode = SvIV(status);
-       r->handle = zhandle;
-       ptr = SvPV(name, len);
-       q->implementation_name = (char *)xmalloc(len + 1);
-       strcpy(q->implementation_name, ptr);
-/*     q->implementation_name = SvPV(name, len);*/
-       ptr = SvPV(ver, len);
-       q->implementation_version = (char *)xmalloc(len + 1);
-       strcpy(q->implementation_version, ptr);
        
-       return r;
+       return r;       
 }
 
-
 void bend_close(void *handle)
 {
        HV *href;
        Zfront_handle *zhandle = (Zfront_handle *)handle;
-       SV **temp;
-
+       CV* handler_cv = 0;
+       int stop_flag = 0;
        dSP;
        ENTER;
        SAVETMPS;
 
-       if (close_ref == NULL)
+       if (close_ref)
        {
-               return;
-       }
-
-       href = newHV();
-       hv_store(href, "HANDLE", 6, zhandle->handle, 0);
+               href = newHV();
+               hv_store(href, "HANDLE", 6, zhandle->handle, 0);
 
-       PUSHMARK(sp);
+               PUSHMARK(sp);
 
-       XPUSHs(sv_2mortal(newRV((SV *)href)));
+               XPUSHs(sv_2mortal(newRV((SV *)href)));
 
-       PUTBACK;
+               PUTBACK;
        
-       perl_call_sv(close_ref, G_SCALAR | G_DISCARD);
+               handler_cv = simpleserver_sv2cv( close_ref );
+               perl_call_sv( (SV *) handler_cv, G_SCALAR | G_DISCARD);
        
-       SPAGAIN;
+               SPAGAIN;
 
+               sv_free((SV*) href);
+       }
+       else
+               sv_free(zhandle->handle);
        PUTBACK;
        FREETMPS;
        LEAVE;
+       stop_flag = zhandle->stop_flag;
+       nmem_destroy(zhandle->nmem);
+       simpleserver_free();
 
-       xfree(handle);
-       
+       if (stop_flag)
+               exit(0);
        return;
 }
 
 
 MODULE = Net::Z3950::SimpleServer      PACKAGE = Net::Z3950::SimpleServer
 
+PROTOTYPES: DISABLE
+
+
 void
 set_init_handler(arg)
                SV *arg
@@ -1114,6 +1549,11 @@ set_scan_handler(arg)
        CODE:
                scan_ref = newSVsv(arg);
 
+void
+set_explain_handler(arg)
+               SV *arg
+       CODE:
+               explain_ref = newSVsv(arg);
 
 int
 start_server(...)
@@ -1133,6 +1573,12 @@ start_server(...)
                        strcpy(*argv_buf++, ptr); 
                }
                *argv_buf = NULL;
+               root_perl_context = PERL_GET_CONTEXT;
+               nmem_mutex_create(&simpleserver_mutex);
+#if 0
+               /* only for debugging perl_clone .. */
+               tst_clones();
+#endif
                
                RETVAL = statserv_main(items, argv, bend_init, bend_close);
        OUTPUT:
@@ -1154,3 +1600,11 @@ ScanPartial()
                RETVAL
 
  
+void
+yazlog(arg)
+               SV *arg
+       CODE:
+               STRLEN len;
+               char *ptr;
+               ptr = SvPV(arg, len);
+               yaz_log(YLOG_LOG, "%.*s", len, ptr);