[p5sagit/p5-mst-13.2.git] / ext / DynaLoader / dl_vms.xs

/* dl_vms.xs
 * 
 * Platform:  OpenVMS, VAX or AXP or IA64
 * Author:    Charles Bailey  bailey@newman.upenn.edu
 * Revised:   See http://public.activestate.com/cgi-bin/perlbrowse
 *
 *                           Implementation Note
 *     This section is added as an aid to users and DynaLoader developers, in
 * order to clarify the process of dynamic linking under VMS.
 *     dl_vms.xs uses the supported VMS dynamic linking call, which allows
 * a running program to map an arbitrary file of executable code and call
 * routines within that file.  This is done via the VMS RTL routine
 * lib$find_image_symbol, whose calling sequence is as follows:
 *   status = lib$find_image_symbol(imgname,symname,symval,defspec);
 *   where
 *     status  = a standard VMS status value (unsigned long int)
 *     imgname = a fixed-length string descriptor, passed by
 *               reference, containing the NAME ONLY of the image
 *               file to be mapped.  An attempt will be made to
 *               translate this string as a logical name, so it may
 *               not contain any characters which are not allowed in
 *               logical names.  If no translation is found, imgname
 *               is used directly as the name of the image file.
 *     symname = a fixed-length string descriptor, passed by
 *               reference, containing the name of the routine
 *               to be located.
 *     symval  = an unsigned long int, passed by reference, into
 *               which is written the entry point address of the
 *               routine whose name is specified in symname.
 *     defspec = a fixed-length string descriptor, passed by
 *               reference, containing a default file specification
 *               whichis used to fill in any missing parts of the
 *               image file specification after the imgname argument
 *               is processed.
 * In order to accommodate the handling of the imgname argument, the routine
 * dl_expandspec() is provided for use by perl code (e.g. dl_findfile)
 * which wants to see what image file lib$find_image_symbol would use if
 * it were passed a given file specification.  The file specification passed
 * to dl_expandspec() and dl_load_file() can be partial or complete, and can
 * use VMS or Unix syntax; these routines perform the necessary conversions.
 *    In general, writers of perl extensions need only conform to the
 * procedures set out in the DynaLoader documentation, and let the details
 * be taken care of by the routines here and in DynaLoader.pm.  If anyone
 * comes across any incompatibilities, please let me know.  Thanks.
 *
 */

#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

#include <descrip.h>
#include <fscndef.h>
#include <lib$routines.h>
#include <rms.h>
#include <ssdef.h>
#include <starlet.h>

#if defined(VMS_WE_ARE_CASE_SENSITIVE)
#define DL_CASE_SENSITIVE 1<<4
#else
#define DL_CASE_SENSITIVE 0
#endif

typedef unsigned long int vmssts;

struct libref {
  struct dsc$descriptor_s name;
  struct dsc$descriptor_s defspec;
};

typedef struct {
    AV *	x_require_symbols;
/* "Static" data for dl_expand_filespec() - This is static to save
 * initialization on each call; if you need context-independence,
 * just make these auto variables in dl_expandspec() and dl_load_file()
 */
    char	x_esa[NAM$C_MAXRSS];
    char	x_rsa[NAM$C_MAXRSS];
    struct FAB	x_fab;
    struct NAM	x_nam;
} my_cxtx_t;		/* this *must* be named my_cxtx_t */

#define DL_CXT_EXTRA	/* ask for dl_cxtx to be defined in dlutils.c */
#include "dlutils.c"    /* dl_debug, dl_last_error; SaveError not used  */

#define dl_require_symbols	(dl_cxtx.x_require_symbols)
#define dl_esa			(dl_cxtx.x_esa)
#define dl_rsa			(dl_cxtx.x_rsa)
#define dl_fab			(dl_cxtx.x_fab)
#define dl_nam			(dl_cxtx.x_nam)

/* $PutMsg action routine - records error message in dl_last_error */
static vmssts
copy_errmsg(msg,unused)
    struct dsc$descriptor_s *   msg;
    vmssts  unused;
{
    dTHX;
    dMY_CXT;
    if (*(msg->dsc$a_pointer) == '%') { /* first line */
      if (dl_last_error)
        strncpy((dl_last_error = saferealloc(dl_last_error,msg->dsc$w_length+1)),
                 msg->dsc$a_pointer, msg->dsc$w_length);
      else
        strncpy((dl_last_error = safemalloc(msg->dsc$w_length+1)),
                 msg->dsc$a_pointer, msg->dsc$w_length);
      dl_last_error[msg->dsc$w_length] = '\0';
    }
    else { /* continuation line */
      int errlen = strlen(dl_last_error);
      dl_last_error = saferealloc(dl_last_error, errlen + msg->dsc$w_length + 2);
      dl_last_error[errlen] = '\n';  dl_last_error[errlen+1] = '\0';
      strncat(dl_last_error, msg->dsc$a_pointer, msg->dsc$w_length);
      dl_last_error[errlen+msg->dsc$w_length+1] = '\0';
    }
    DLDEBUG(2,PerlIO_printf(Perl_debug_log, "Saved error message: %s\n", dl_last_error));
    return 0;
}

/* Use $PutMsg to retrieve error message for failure status code */
static void
dl_set_error(sts,stv)
    vmssts  sts;
    vmssts  stv;
{
    vmssts vec[3];
    dTHX;

    vec[0] = stv ? 2 : 1;
    vec[1] = sts;  vec[2] = stv;
    _ckvmssts(sys$putmsg(vec,copy_errmsg,0,0));
}

/* wrapper for lib$find_image_symbol, so signalled errors can be saved
 * for dl_error and then returned */
static unsigned long int
my_find_image_symbol(struct dsc$descriptor_s *imgname,
                     struct dsc$descriptor_s *symname,
                     void (**entry)(),
                     struct dsc$descriptor_s *defspec)
{
  unsigned long int retsts;
  VAXC$ESTABLISH(lib$sig_to_ret);
  retsts = lib$find_image_symbol(imgname,symname,entry,defspec,DL_CASE_SENSITIVE);
  return retsts;
}


static void
dl_private_init(pTHX)
{
    dl_generic_private_init(aTHX);
    {
	dMY_CXT;
	dl_require_symbols = get_av("DynaLoader::dl_require_symbols", 0x4);
	/* Set up the static control blocks for dl_expand_filespec() */
	dl_fab = cc$rms_fab;
	dl_nam = cc$rms_nam;
	dl_fab.fab$l_nam = &dl_nam;
	dl_nam.nam$l_esa = dl_esa;
	dl_nam.nam$b_ess = sizeof dl_esa;
	dl_nam.nam$l_rsa = dl_rsa;
	dl_nam.nam$b_rss = sizeof dl_rsa;
    }
}
MODULE = DynaLoader PACKAGE = DynaLoader

BOOT:
    (void)dl_private_init(aTHX);

void
dl_expandspec(filespec)
    char *	filespec
    CODE:
    char vmsspec[NAM$C_MAXRSS], defspec[NAM$C_MAXRSS];
    size_t deflen;
    vmssts sts;
    dMY_CXT;

    tovmsspec(filespec,vmsspec);
    dl_fab.fab$l_fna = vmsspec;
    dl_fab.fab$b_fns = strlen(vmsspec);
    dl_fab.fab$l_dna = 0;
    dl_fab.fab$b_dns = 0;
    DLDEBUG(1,PerlIO_printf(Perl_debug_log, "dl_expand_filespec(%s):\n",vmsspec));
    /* On the first pass, just parse the specification string */
    dl_nam.nam$b_nop = NAM$M_SYNCHK;
    sts = sys$parse(&dl_fab);
    DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tSYNCHK sys$parse = %d\n",sts));
    if (!(sts & 1)) {
      dl_set_error(dl_fab.fab$l_sts,dl_fab.fab$l_stv);
      ST(0) = &PL_sv_undef;
    }
    else {
      /* Now set up a default spec - everything but the name */
      deflen = dl_nam.nam$l_name - dl_esa;
      memcpy(defspec,dl_esa,deflen);
      memcpy(defspec+deflen,dl_nam.nam$l_type,
             dl_nam.nam$b_type + dl_nam.nam$b_ver);
      deflen += dl_nam.nam$b_type + dl_nam.nam$b_ver;
      memcpy(vmsspec,dl_nam.nam$l_name,dl_nam.nam$b_name);
      DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tsplit filespec: name = %.*s, default = %.*s\n",
                        dl_nam.nam$b_name,vmsspec,deflen,defspec));
      /* . . . and go back to expand it */
      dl_nam.nam$b_nop = 0;
      dl_fab.fab$l_dna = defspec;
      dl_fab.fab$b_dns = deflen;
      dl_fab.fab$b_fns = dl_nam.nam$b_name;
      sts = sys$parse(&dl_fab);
      DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tname/default sys$parse = %d\n",sts));
      if (!(sts & 1)) {
        dl_set_error(dl_fab.fab$l_sts,dl_fab.fab$l_stv);
        ST(0) = &PL_sv_undef;
      }
      else {
        /* Now find the actual file */
        sts = sys$search(&dl_fab);
        DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tsys$search = %d\n",sts));
        if (!(sts & 1)) {
          dl_set_error(dl_fab.fab$l_sts,dl_fab.fab$l_stv);
          ST(0) = &PL_sv_undef;
        }
        else {
          ST(0) = sv_2mortal(newSVpvn(dl_nam.nam$l_rsa,dl_nam.nam$b_rsl));
          DLDEBUG(1,PerlIO_printf(Perl_debug_log, "\tresult = \\%.*s\\\n",
                            dl_nam.nam$b_rsl,dl_nam.nam$l_rsa));
        }
      }
    }

void
dl_load_file(filename, flags=0)
    char *	filename
    int		flags
    PREINIT:
    dTHX;
    dMY_CXT;
    char vmsspec[NAM$C_MAXRSS];
    SV *reqSV, **reqSVhndl;
    STRLEN deflen;
    struct dsc$descriptor_s
      specdsc = {0, DSC$K_DTYPE_T, DSC$K_CLASS_S, 0},
      symdsc  = {0, DSC$K_DTYPE_T, DSC$K_CLASS_S, 0};
    struct fscnlst {
      unsigned short int len;
      unsigned short int code;
      char *string;
    }  namlst[2] = {{0,FSCN$_NAME,0},{0,0,0}};
    struct libref *dlptr;
    vmssts sts, failed = 0;
    void (*entry)();
    CODE:

    DLDEBUG(1,PerlIO_printf(Perl_debug_log, "dl_load_file(%s,%x):\n", filename,flags));
    specdsc.dsc$a_pointer = tovmsspec(filename,vmsspec);
    specdsc.dsc$w_length = strlen(specdsc.dsc$a_pointer);
    if (specdsc.dsc$w_length == 0) { /* undef in, empty out */
        XSRETURN_EMPTY;
    }
    DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tVMS-ified filename is %s\n",
                      specdsc.dsc$a_pointer));
    Newx(dlptr,1,struct libref);
    dlptr->name.dsc$b_dtype = dlptr->defspec.dsc$b_dtype = DSC$K_DTYPE_T;
    dlptr->name.dsc$b_class = dlptr->defspec.dsc$b_class = DSC$K_CLASS_S;
    sts = sys$filescan(&specdsc,namlst,0);
    DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tsys$filescan: returns %d, name is %.*s\n",
                      sts,namlst[0].len,namlst[0].string));
    if (!(sts & 1)) {
      failed = 1;
      dl_set_error(sts,0);
    }
    else {
      dlptr->name.dsc$w_length = namlst[0].len;
      dlptr->name.dsc$a_pointer = savepvn(namlst[0].string,namlst[0].len);
      dlptr->defspec.dsc$w_length = specdsc.dsc$w_length - namlst[0].len;
      Newx(dlptr->defspec.dsc$a_pointer, dlptr->defspec.dsc$w_length + 1, char);
      deflen = namlst[0].string - specdsc.dsc$a_pointer; 
      memcpy(dlptr->defspec.dsc$a_pointer,specdsc.dsc$a_pointer,deflen);
      memcpy(dlptr->defspec.dsc$a_pointer + deflen,
             namlst[0].string + namlst[0].len,
             dlptr->defspec.dsc$w_length - deflen);
      DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tlibref = name: %s, defspec: %.*s\n",
                        dlptr->name.dsc$a_pointer,
                        dlptr->defspec.dsc$w_length,
                        dlptr->defspec.dsc$a_pointer));
      if (!(reqSVhndl = av_fetch(dl_require_symbols,0,FALSE)) || !(reqSV = *reqSVhndl)) {
        DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\t@dl_require_symbols empty, returning untested libref\n"));
      }
      else {
        symdsc.dsc$w_length = SvCUR(reqSV);
        symdsc.dsc$a_pointer = SvPVX(reqSV);
        DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\t$dl_require_symbols[0] = %.*s\n",
                          symdsc.dsc$w_length, symdsc.dsc$a_pointer));
        sts = my_find_image_symbol(&(dlptr->name),&symdsc,
                                    &entry,&(dlptr->defspec));
        DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tlib$find_image_symbol returns %d\n",sts));
        if (!(sts&1)) {
          failed = 1;
          dl_set_error(sts,0);
        }
      }
    }

    if (failed) {
      Safefree(dlptr->name.dsc$a_pointer);
      Safefree(dlptr->defspec.dsc$a_pointer);
      Safefree(dlptr);
      ST(0) = &PL_sv_undef;
    }
    else {
      ST(0) = sv_2mortal(newSViv(PTR2IV(dlptr)));
    }


void
dl_find_symbol(librefptr,symname)
    void *	librefptr
    SV *	symname
    CODE:
    struct libref thislib = *((struct libref *)librefptr);
    struct dsc$descriptor_s
      symdsc = {SvCUR(symname),DSC$K_DTYPE_T,DSC$K_CLASS_S,SvPVX(symname)};
    void (*entry)();
    vmssts sts;

    DLDEBUG(1,PerlIO_printf(Perl_debug_log, "dl_find_symbol(%.*s,%.*s):\n",
                      thislib.name.dsc$w_length, thislib.name.dsc$a_pointer,
                      symdsc.dsc$w_length,symdsc.dsc$a_pointer));
    sts = my_find_image_symbol(&(thislib.name),&symdsc,
                               &entry,&(thislib.defspec));
    DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tlib$find_image_symbol returns %d\n",sts));
    DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tentry point is %d\n",
                      (unsigned long int) entry));
    if (!(sts & 1)) {
      dl_set_error(sts,0);
      ST(0) = &PL_sv_undef;
    }
    else ST(0) = sv_2mortal(newSViv(PTR2IV(entry)));


void
dl_undef_symbols()
    PPCODE:


# These functions should not need changing on any platform:

void
dl_install_xsub(perl_name, symref, filename="$Package")
    char *	perl_name
    void *	symref 
    const char *	filename
    CODE:
    DLDEBUG(2,PerlIO_printf(Perl_debug_log, "dl_install_xsub(name=%s, symref=%x)\n",
        perl_name, symref));
    ST(0) = sv_2mortal(newRV((SV*)newXS_flags(perl_name,
					      (void(*)(pTHX_ CV *))symref,
					      filename, NULL,
					      XS_DYNAMIC_FILENAME)));


char *
dl_error()
    CODE:
    dMY_CXT;
    RETVAL = dl_last_error ;
    OUTPUT:
      RETVAL

# end.
Commit	Line	Data
a0d0e21e	1	/* dl_vms.xs
a0d0e21e	2	*
a491bdcd	3	* Platform: OpenVMS, VAX or AXP or IA64
bd3fa61c	4	* Author: Charles Bailey bailey@newman.upenn.edu
a491bdcd	5	* Revised: See http://public.activestate.com/cgi-bin/perlbrowse
a0d0e21e	6	*
	7	* Implementation Note
	8	* This section is added as an aid to users and DynaLoader developers, in
	9	* order to clarify the process of dynamic linking under VMS.
	10	* dl_vms.xs uses the supported VMS dynamic linking call, which allows
	11	* a running program to map an arbitrary file of executable code and call
	12	* routines within that file. This is done via the VMS RTL routine
	13	* lib$find_image_symbol, whose calling sequence is as follows:
	14	* status = lib$find_image_symbol(imgname,symname,symval,defspec);
	15	* where
	16	* status = a standard VMS status value (unsigned long int)
	17	* imgname = a fixed-length string descriptor, passed by
	18	* reference, containing the NAME ONLY of the image
	19	* file to be mapped. An attempt will be made to
	20	* translate this string as a logical name, so it may
	21	* not contain any characters which are not allowed in
	22	* logical names. If no translation is found, imgname
	23	* is used directly as the name of the image file.
	24	* symname = a fixed-length string descriptor, passed by
	25	* reference, containing the name of the routine
	26	* to be located.
	27	* symval = an unsigned long int, passed by reference, into
	28	* which is written the entry point address of the
	29	* routine whose name is specified in symname.
	30	* defspec = a fixed-length string descriptor, passed by
	31	* reference, containing a default file specification
	32	* whichis used to fill in any missing parts of the
	33	* image file specification after the imgname argument
	34	* is processed.
	35	* In order to accommodate the handling of the imgname argument, the routine
	36	* dl_expandspec() is provided for use by perl code (e.g. dl_findfile)
	37	* which wants to see what image file lib$find_image_symbol would use if
	38	* it were passed a given file specification. The file specification passed
	39	* to dl_expandspec() and dl_load_file() can be partial or complete, and can
	40	* use VMS or Unix syntax; these routines perform the necessary conversions.
	41	* In general, writers of perl extensions need only conform to the
	42	* procedures set out in the DynaLoader documentation, and let the details
	43	* be taken care of by the routines here and in DynaLoader.pm. If anyone
	44	* comes across any incompatibilities, please let me know. Thanks.
	45	*
	46	*/
	47
	48	#include "EXTERN.h"
	49	#include "perl.h"
	50	#include "XSUB.h"
	51
a0d0e21e	52	#include <descrip.h>
	53	#include <fscndef.h>
	54	#include <lib$routines.h>
	55	#include <rms.h>
	56	#include <ssdef.h>
748a9306	57	#include <starlet.h>
a0d0e21e	58
b6837a3b	59	#if defined(VMS_WE_ARE_CASE_SENSITIVE)
	60	#define DL_CASE_SENSITIVE 1<<4
	61	#else
	62	#define DL_CASE_SENSITIVE 0
	63	#endif
	64
a0d0e21e	65	typedef unsigned long int vmssts;
	66
	67	struct libref {
	68	struct dsc$descriptor_s name;
	69	struct dsc$descriptor_s defspec;
	70	};
	71
cdc73a10	72	typedef struct {
	73	AV * x_require_symbols;
	74	/* "Static" data for dl_expand_filespec() - This is static to save
a0d0e21e	75	* initialization on each call; if you need context-independence,
	76	* just make these auto variables in dl_expandspec() and dl_load_file()
	77	*/
cdc73a10	78	char x_esa[NAM$C_MAXRSS];
	79	char x_rsa[NAM$C_MAXRSS];
	80	struct FAB x_fab;
	81	struct NAM x_nam;
	82	} my_cxtx_t; /* this must be named my_cxtx_t */
	83
	84	#define DL_CXT_EXTRA /* ask for dl_cxtx to be defined in dlutils.c */
	85	#include "dlutils.c" /* dl_debug, dl_last_error; SaveError not used */
	86
	87	#define dl_require_symbols (dl_cxtx.x_require_symbols)
	88	#define dl_esa (dl_cxtx.x_esa)
	89	#define dl_rsa (dl_cxtx.x_rsa)
	90	#define dl_fab (dl_cxtx.x_fab)
	91	#define dl_nam (dl_cxtx.x_nam)
	92
	93	/* $PutMsg action routine - records error message in dl_last_error */
a0d0e21e	94	static vmssts
	95	copy_errmsg(msg,unused)
	96	struct dsc$descriptor_s * msg;
	97	vmssts unused;
	98	{
ecdc15d9	99	dTHX;
cdc73a10	100	dMY_CXT;
748a9306	101	if ((msg->dsc$a_pointer) == '%') { / first line */
cdc73a10	102	if (dl_last_error)
cdc73a10	103	strncpy((dl_last_error = saferealloc(dl_last_error,msg->dsc$w_length+1)),
a0d0e21e	104	msg->dsc$a_pointer, msg->dsc$w_length);
a0d0e21e	105	else
cdc73a10	106	strncpy((dl_last_error = safemalloc(msg->dsc$w_length+1)),
a0d0e21e	107	msg->dsc$a_pointer, msg->dsc$w_length);
cdc73a10	108	dl_last_error[msg->dsc$w_length] = '\0';
a0d0e21e	109	}
a0d0e21e	110	else { /* continuation line */
cdc73a10	111	int errlen = strlen(dl_last_error);
	112	dl_last_error = saferealloc(dl_last_error, errlen + msg->dsc$w_length + 2);
	113	dl_last_error[errlen] = '\n'; dl_last_error[errlen+1] = '\0';
	114	strncat(dl_last_error, msg->dsc$a_pointer, msg->dsc$w_length);
	115	dl_last_error[errlen+msg->dsc$w_length+1] = '\0';
a0d0e21e	116	}
8381071f	117	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "Saved error message: %s\n", dl_last_error));
2708a6a3	118	return 0;
a0d0e21e	119	}
	120
	121	/* Use $PutMsg to retrieve error message for failure status code */
	122	static void
	123	dl_set_error(sts,stv)
	124	vmssts sts;
	125	vmssts stv;
	126	{
748a9306	127	vmssts vec[3];
5c84aa53	128	dTHX;
a0d0e21e	129
	130	vec[0] = stv ? 2 : 1;
	131	vec[1] = sts; vec[2] = stv;
748a9306	132	_ckvmssts(sys$putmsg(vec,copy_errmsg,0,0));
a0d0e21e	133	}
a0d0e21e	134
2708a6a3	135	/* wrapper for lib$find_image_symbol, so signalled errors can be saved
	136	* for dl_error and then returned */
	137	static unsigned long int
	138	my_find_image_symbol(struct dsc$descriptor_s *imgname,
	139	struct dsc$descriptor_s *symname,
	140	void (**entry)(),
	141	struct dsc$descriptor_s *defspec)
	142	{
	143	unsigned long int retsts;
8381071f	144	VAXC$ESTABLISH(lib$sig_to_ret);
b6837a3b	145	retsts = lib$find_image_symbol(imgname,symname,entry,defspec,DL_CASE_SENSITIVE);
2708a6a3	146	return retsts;
	147	}
	148
	149
a0d0e21e	150	static void
cea2e8a9	151	dl_private_init(pTHX)
a0d0e21e	152	{
cea2e8a9	153	dl_generic_private_init(aTHX);
cdc73a10	154	{
	155	dMY_CXT;
	156	dl_require_symbols = get_av("DynaLoader::dl_require_symbols", 0x4);
	157	/* Set up the static control blocks for dl_expand_filespec() */
	158	dl_fab = cc$rms_fab;
	159	dl_nam = cc$rms_nam;
	160	dl_fab.fab$l_nam = &dl_nam;
	161	dl_nam.nam$l_esa = dl_esa;
	162	dl_nam.nam$b_ess = sizeof dl_esa;
	163	dl_nam.nam$l_rsa = dl_rsa;
	164	dl_nam.nam$b_rss = sizeof dl_rsa;
	165	}
a0d0e21e	166	}
	167	MODULE = DynaLoader PACKAGE = DynaLoader
	168
	169	BOOT:
cea2e8a9	170	(void)dl_private_init(aTHX);
a0d0e21e	171
748a9306	172	void
a0d0e21e	173	dl_expandspec(filespec)
	174	char * filespec
	175	CODE:
	176	char vmsspec[NAM$C_MAXRSS], defspec[NAM$C_MAXRSS];
	177	size_t deflen;
	178	vmssts sts;
cdc73a10	179	dMY_CXT;
a0d0e21e	180
a0d0e21e	181	tovmsspec(filespec,vmsspec);
cdc73a10	182	dl_fab.fab$l_fna = vmsspec;
	183	dl_fab.fab$b_fns = strlen(vmsspec);
	184	dl_fab.fab$l_dna = 0;
	185	dl_fab.fab$b_dns = 0;
146174a9	186	DLDEBUG(1,PerlIO_printf(Perl_debug_log, "dl_expand_filespec(%s):\n",vmsspec));
a0d0e21e	187	/* On the first pass, just parse the specification string */
cdc73a10	188	dl_nam.nam$b_nop = NAM$M_SYNCHK;
cdc73a10	189	sts = sys$parse(&dl_fab);
146174a9	190	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tSYNCHK sys$parse = %d\n",sts));
a0d0e21e	191	if (!(sts & 1)) {
cdc73a10	192	dl_set_error(dl_fab.fab$l_sts,dl_fab.fab$l_stv);
6b88bc9c	193	ST(0) = &PL_sv_undef;
a0d0e21e	194	}
	195	else {
	196	/* Now set up a default spec - everything but the name */
cdc73a10	197	deflen = dl_nam.nam$l_name - dl_esa;
	198	memcpy(defspec,dl_esa,deflen);
	199	memcpy(defspec+deflen,dl_nam.nam$l_type,
	200	dl_nam.nam$b_type + dl_nam.nam$b_ver);
	201	deflen += dl_nam.nam$b_type + dl_nam.nam$b_ver;
	202	memcpy(vmsspec,dl_nam.nam$l_name,dl_nam.nam$b_name);
146174a9	203	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tsplit filespec: name = %.s, default = %.s\n",
cdc73a10	204	dl_nam.nam$b_name,vmsspec,deflen,defspec));
a0d0e21e	205	/* . . . and go back to expand it */
cdc73a10	206	dl_nam.nam$b_nop = 0;
	207	dl_fab.fab$l_dna = defspec;
	208	dl_fab.fab$b_dns = deflen;
	209	dl_fab.fab$b_fns = dl_nam.nam$b_name;
	210	sts = sys$parse(&dl_fab);
146174a9	211	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tname/default sys$parse = %d\n",sts));
a0d0e21e	212	if (!(sts & 1)) {
cdc73a10	213	dl_set_error(dl_fab.fab$l_sts,dl_fab.fab$l_stv);
6b88bc9c	214	ST(0) = &PL_sv_undef;
a0d0e21e	215	}
	216	else {
	217	/* Now find the actual file */
cdc73a10	218	sts = sys$search(&dl_fab);
146174a9	219	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tsys$search = %d\n",sts));
2708a6a3	220	if (!(sts & 1)) {
cdc73a10	221	dl_set_error(dl_fab.fab$l_sts,dl_fab.fab$l_stv);
6b88bc9c	222	ST(0) = &PL_sv_undef;
a0d0e21e	223	}
a0d0e21e	224	else {
cdc73a10	225	ST(0) = sv_2mortal(newSVpvn(dl_nam.nam$l_rsa,dl_nam.nam$b_rsl));
146174a9	226	DLDEBUG(1,PerlIO_printf(Perl_debug_log, "\tresult = \\%.*s\\\n",
cdc73a10	227	dl_nam.nam$b_rsl,dl_nam.nam$l_rsa));
a0d0e21e	228	}
	229	}
	230	}
	231
748a9306	232	void
a491bdcd	233	dl_load_file(filename, flags=0)
a491bdcd	234	char * filename
ff7f3c60	235	int flags
ff7f3c60	236	PREINIT:
626727d5	237	dTHX;
ecdc15d9	238	dMY_CXT;
a0d0e21e	239	char vmsspec[NAM$C_MAXRSS];
a0d0e21e	240	SV reqSV, *reqSVhndl;
	241	STRLEN deflen;
	242	struct dsc$descriptor_s
	243	specdsc = {0, DSC$K_DTYPE_T, DSC$K_CLASS_S, 0},
	244	symdsc = {0, DSC$K_DTYPE_T, DSC$K_CLASS_S, 0};
	245	struct fscnlst {
	246	unsigned short int len;
	247	unsigned short int code;
	248	char *string;
748a9306	249	} namlst[2] = {{0,FSCN$_NAME,0},{0,0,0}};
a0d0e21e	250	struct libref *dlptr;
a0d0e21e	251	vmssts sts, failed = 0;
2708a6a3	252	void (*entry)();
ff7f3c60	253	CODE:
a0d0e21e	254
a491bdcd	255	DLDEBUG(1,PerlIO_printf(Perl_debug_log, "dl_load_file(%s,%x):\n", filename,flags));
a491bdcd	256	specdsc.dsc$a_pointer = tovmsspec(filename,vmsspec);
a0d0e21e	257	specdsc.dsc$w_length = strlen(specdsc.dsc$a_pointer);
a491bdcd	258	if (specdsc.dsc$w_length == 0) { /* undef in, empty out */
	259	XSRETURN_EMPTY;
	260	}
	261	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tVMS-ified filename is %s\n",
a0d0e21e	262	specdsc.dsc$a_pointer));
a02a5408	263	Newx(dlptr,1,struct libref);
a0d0e21e	264	dlptr->name.dsc$b_dtype = dlptr->defspec.dsc$b_dtype = DSC$K_DTYPE_T;
	265	dlptr->name.dsc$b_class = dlptr->defspec.dsc$b_class = DSC$K_CLASS_S;
	266	sts = sys$filescan(&specdsc,namlst,0);
146174a9	267	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tsys$filescan: returns %d, name is %.*s\n",
a0d0e21e	268	sts,namlst[0].len,namlst[0].string));
	269	if (!(sts & 1)) {
	270	failed = 1;
	271	dl_set_error(sts,0);
	272	}
	273	else {
	274	dlptr->name.dsc$w_length = namlst[0].len;
	275	dlptr->name.dsc$a_pointer = savepvn(namlst[0].string,namlst[0].len);
	276	dlptr->defspec.dsc$w_length = specdsc.dsc$w_length - namlst[0].len;
a02a5408	277	Newx(dlptr->defspec.dsc$a_pointer, dlptr->defspec.dsc$w_length + 1, char);
a0d0e21e	278	deflen = namlst[0].string - specdsc.dsc$a_pointer;
	279	memcpy(dlptr->defspec.dsc$a_pointer,specdsc.dsc$a_pointer,deflen);
	280	memcpy(dlptr->defspec.dsc$a_pointer + deflen,
	281	namlst[0].string + namlst[0].len,
	282	dlptr->defspec.dsc$w_length - deflen);
146174a9	283	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tlibref = name: %s, defspec: %.*s\n",
a0d0e21e	284	dlptr->name.dsc$a_pointer,
	285	dlptr->defspec.dsc$w_length,
	286	dlptr->defspec.dsc$a_pointer));
8e07c86e	287	if (!(reqSVhndl = av_fetch(dl_require_symbols,0,FALSE)) \|\| !(reqSV = *reqSVhndl)) {
146174a9	288	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\t@dl_require_symbols empty, returning untested libref\n"));
a0d0e21e	289	}
	290	else {
	291	symdsc.dsc$w_length = SvCUR(reqSV);
	292	symdsc.dsc$a_pointer = SvPVX(reqSV);
146174a9	293	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\t$dl_require_symbols[0] = %.*s\n",
a0d0e21e	294	symdsc.dsc$w_length, symdsc.dsc$a_pointer));
2708a6a3	295	sts = my_find_image_symbol(&(dlptr->name),&symdsc,
a0d0e21e	296	&entry,&(dlptr->defspec));
146174a9	297	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tlib$find_image_symbol returns %d\n",sts));
a0d0e21e	298	if (!(sts&1)) {
	299	failed = 1;
	300	dl_set_error(sts,0);
	301	}
	302	}
	303	}
	304
	305	if (failed) {
	306	Safefree(dlptr->name.dsc$a_pointer);
	307	Safefree(dlptr->defspec.dsc$a_pointer);
	308	Safefree(dlptr);
6b88bc9c	309	ST(0) = &PL_sv_undef;
a0d0e21e	310	}
a0d0e21e	311	else {
c529f79d	312	ST(0) = sv_2mortal(newSViv(PTR2IV(dlptr)));
a0d0e21e	313	}
	314
	315
748a9306	316	void
a0d0e21e	317	dl_find_symbol(librefptr,symname)
	318	void * librefptr
	319	SV * symname
	320	CODE:
	321	struct libref thislib = ((struct libref )librefptr);
	322	struct dsc$descriptor_s
	323	symdsc = {SvCUR(symname),DSC$K_DTYPE_T,DSC$K_CLASS_S,SvPVX(symname)};
	324	void (*entry)();
	325	vmssts sts;
	326
a491bdcd	327	DLDEBUG(1,PerlIO_printf(Perl_debug_log, "dl_find_symbol(%.s,%.s):\n",
a0d0e21e	328	thislib.name.dsc$w_length, thislib.name.dsc$a_pointer,
a0d0e21e	329	symdsc.dsc$w_length,symdsc.dsc$a_pointer));
2708a6a3	330	sts = my_find_image_symbol(&(thislib.name),&symdsc,
2708a6a3	331	&entry,&(thislib.defspec));
146174a9	332	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tlib$find_image_symbol returns %d\n",sts));
146174a9	333	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tentry point is %d\n",
a0d0e21e	334	(unsigned long int) entry));
a0d0e21e	335	if (!(sts & 1)) {
8381071f	336	dl_set_error(sts,0);
6b88bc9c	337	ST(0) = &PL_sv_undef;
a0d0e21e	338	}
c529f79d	339	else ST(0) = sv_2mortal(newSViv(PTR2IV(entry)));
a0d0e21e	340
	341
	342	void
	343	dl_undef_symbols()
	344	PPCODE:
	345
	346
	347	# These functions should not need changing on any platform:
	348
	349	void
	350	dl_install_xsub(perl_name, symref, filename="$Package")
	351	char * perl_name
	352	void * symref
d3f5e399	353	const char * filename
a0d0e21e	354	CODE:
146174a9	355	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "dl_install_xsub(name=%s, symref=%x)\n",
a0d0e21e	356	perl_name, symref));
77004dee	357	ST(0) = sv_2mortal(newRV((SV*)newXS_flags(perl_name,
	358	(void()(pTHX_ CV ))symref,
	359	filename, NULL,
	360	XS_DYNAMIC_FILENAME)));
a0d0e21e	361
	362
	363	char *
	364	dl_error()
	365	CODE:
cdc73a10	366	dMY_CXT;
cdc73a10	367	RETVAL = dl_last_error ;
a0d0e21e	368	OUTPUT:
	369	RETVAL
	370
	371	# end.