Avoid mixed stmt/var declare
[simpleserver-moved-to-github.git] / SimpleServer.xs
index d8df0bf..862ef21 100644 (file)
@@ -1,5 +1,8 @@
 /*
- * Copyright (c) 2000, Index Data.
+ * $Id: SimpleServer.xs,v 1.36 2006-01-30 21:29:41 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 1.14  2002-03-05 00:34:13  mike
-/*Support for implementation_id (commented out until it's
-/*in mainstream Yaz)
-/*
-/*Revision 1.13  2002/02/28 11:21:57  mike
-/*Add RPN structure to search-handler argument hash.
-/*
-/*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 <stdio.h>
+#ifdef WIN32
+#else
 #include <unistd.h>
+#endif
 #include <stdlib.h>
 #include <ctype.h>
 #define GRS_MAX_FIELDS 500 
@@ -75,6 +50,8 @@
 #define sv_undef PL_sv_undef
 #endif
 
+NMEM_MUTEX simpleserver_mutex;
+
 typedef struct {
        SV *handle;
 
@@ -87,8 +64,12 @@ typedef struct {
        SV *esrequest_ref;
        SV *delete_ref;
        SV *scan_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;
@@ -98,28 +79,124 @@ SV *present_ref = NULL;
 SV *esrequest_ref = NULL;
 SV *delete_ref = NULL;
 SV *scan_ref = NULL;
+PerlInterpreter *root_perl_context;
 int MAX_OID = 15;
 
+#define GRS_BUF_SIZE 512
+
+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(LOG_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))
@@ -131,25 +208,16 @@ 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;
+                       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)
-               {
-                       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)
+               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);
                        exit(0);
@@ -183,8 +251,6 @@ 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++;
@@ -292,7 +358,7 @@ void fatal(char *fmt, ...)
 {
     va_list ap;
 
-    fprintf(stderr, "FATAL (yazwrap): ");
+    fprintf(stderr, "FATAL (SimpleServer): ");
     va_start(ap, fmt);
     vfprintf(stderr, fmt, ap);
     va_end(ap);
@@ -375,8 +441,22 @@ static SV *rpn2perl(Z_RPNStructure *s)
     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;
+       }
        if (o->which != Z_Operand_APT)
-           fatal("can't handle RPN simples other than 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");
@@ -500,9 +580,6 @@ int bend_sort(void *handle, bend_sort_rr *rr)
        temp = hv_fetch(href, "STATUS", 6, 1);
        status = newSVsv(*temp);
 
-
-       
-
        PUTBACK;
        FREETMPS;
        LEAVE;
@@ -529,19 +606,15 @@ 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;
 
        dSP;
        ENTER;
@@ -553,6 +626,12 @@ 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);
        hv_store(href, "REPL_SET", 8, newSViv(rr->replace_set), 0);
@@ -578,46 +657,36 @@ 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);
+       PUTBACK;
+       FREETMPS;
+       LEAVE;
        return 0;
 }
 
@@ -707,6 +776,7 @@ int bend_fetch(void *handle, bend_fetch_rr *rr)
        oident *oid;
        WRBUF oid_dotted;
        Zfront_handle *zhandle = (Zfront_handle *)handle;
+       CV* handler_cv = 0;
 
        Z_RecordComposition *composition;
        Z_ElementSetNames *simple;
@@ -758,7 +828,8 @@ 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;
 
@@ -786,9 +857,6 @@ int bend_fetch(void *handle, bend_fetch_rr *rr)
        temp = hv_fetch(href, "HANDLE", 6, 1);
        point = newSVsv(*temp);
 
-       PUTBACK;
-       FREETMPS;
-       LEAVE;
 
        hv_undef(href);
        
@@ -842,6 +910,10 @@ int bend_fetch(void *handle, bend_fetch_rr *rr)
        sv_free(err_code),
        sv_free(sur_flag);
        sv_free(rep_form);
+
+       PUTBACK;
+       FREETMPS;
+       LEAVE;
        
        return 0;
 }
@@ -849,7 +921,6 @@ 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;
@@ -862,6 +933,7 @@ int bend_present(void *handle, bend_present_rr *rr)
        char *ODR_errstr;
        char *ptr;
        Zfront_handle *zhandle = (Zfront_handle *)handle;
+       CV* handler_cv = 0;
 
 /*     WRBUF oid_dotted; */
 
@@ -909,7 +981,8 @@ 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;
 
@@ -985,10 +1058,9 @@ 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;
@@ -1025,7 +1097,8 @@ 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;
 
@@ -1093,29 +1166,29 @@ int bend_scan(void *handle, bend_scan_rr *rr)
         return 0;
 }
 
-
 bend_initresult *bend_init(bend_initrequest *q)
 {
-       bend_initresult *r = (bend_initresult *) odr_malloc (q->stream, sizeof(*r));
-       HV *href;
-       SV **temp;
-       SV *id;
-       SV *name;
-       SV *ver;
-       SV *err_str;
-       SV *status;
-       Zfront_handle *zhandle =  (Zfront_handle *) xmalloc (sizeof(*zhandle));
+       int dummy = simpleserver_clone();
+       bend_initresult *r = (bend_initresult *)
+               odr_malloc (q->stream, sizeof(*r));
+       char *ptr;
+       char *user = NULL;
+       char *passwd = NULL;
+       CV* handler_cv = 0;
+       dSP;
        STRLEN len;
-       int n;
+       NMEM nmem = nmem_create();
+       Zfront_handle *zhandle =  (Zfront_handle *) nmem_malloc (nmem,
+                       sizeof(*zhandle));
        SV *handle;
-       /*char *name_ptr;
-       char *ver_ptr;*/
-       char *ptr;
+       HV *href;
+       SV **temp;
 
-       dSP;
        ENTER;
        SAVETMPS;
 
+       zhandle->nmem = nmem;
+       zhandle->stop_flag = 0;
        /*q->bend_sort = bend_sort;*/
        if (search_ref)
        {
@@ -1135,107 +1208,133 @@ bend_initresult *bend_init(bend_initrequest *q)
        {
                q->bend_scan = bend_scan;
        }
+
                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) {
+           if (q->auth->which == Z_IdAuthentication_open) {
+               char *openpass = xstrdup (q->auth->u.open);
+               char *cp = strchr (openpass, '/');
+               if (cp) {
+                   *cp = '\0';
+                   user = nmem_strdup (odr_getmem (q->stream), openpass);
+                   passwd = nmem_strdup (odr_getmem (q->stream), cp + 1);
+               }
+               xfree(openpass);
+           } 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 */
+           hv_store(href, "USER", 4, newSVpv(user, 0), 0);
+           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);
-       id = newSVsv(*temp);
+       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;
-#if 0 /* implementation_id support is not yet in mainstream Yaz */
-       ptr = SvPV(id, len);
-       q->implementation_id = (char *)xmalloc(len + 1);
-       strcpy(q->implementation_id, ptr);
-#endif
-       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
@@ -1316,6 +1415,12 @@ 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:
@@ -1337,3 +1442,11 @@ ScanPartial()
                RETVAL
 
  
+void
+yazlog(arg)
+               SV *arg
+       CODE:
+               STRLEN len;
+               char *ptr;
+               ptr = SvPV(arg, len);
+               yaz_log(YLOG_LOG, "%.*s", len, ptr);