[perl5.git] / ext / DynaLoader / dl_vms.xs

/* dl_vms.xs
 * 
 * Platform:  OpenVMS, VAX or AXP
 * Author:    Charles Bailey  bailey@newman.upenn.edu
 * Revised:   12-Dec-1994
 *
 *                           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"

/* N.B.:
 * dl_debug and dl_last_error are static vars; you'll need to deal
 * with them appropriately if you need context independence
 */

#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';
    }
    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));
}

static unsigned int
findsym_handler(void *sig, void *mech)
{
    dTHX;
    unsigned long int myvec[8],args, *usig = (unsigned long int *) sig;
    /* Be paranoid and assume signal vector passed in might be readonly */
    myvec[0] = args = usig[0] > 10 ? 9 : usig[0] - 1;
    while (--args) myvec[args] = usig[args];
    _ckvmssts(sys$putmsg(myvec,copy_errmsg,0,0));
    DLDEBUG(2,PerlIO_printf(Perl_debug_log, "findsym_handler: received\n\t%s\n",dl_last_error));
    return SS$_CONTINUE;
}

/* 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$ESTABLISH(findsym_handler);
  retsts = lib$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(filespec, flags)
    char *	filespec
    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", filespec,flags));
    specdsc.dsc$a_pointer = tovmsspec(filespec,vmsspec);
    specdsc.dsc$w_length = strlen(specdsc.dsc$a_pointer);
    DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tVMS-ified filespec is %s\n",
                      specdsc.dsc$a_pointer));
    New(1399,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;
      New(1097, 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_dymbol(%.*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)) {
      /* error message already saved by findsym_handler */
      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 
    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(perl_name,
				      (void(*)(pTHX_ CV *))symref,
				      filename)));


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

# end.
Commit	Line	Data
a0d0e21e LW	1	/* dl_vms.xs
	2	*
	3	* Platform: OpenVMS, VAX or AXP
bd3fa61c	4	* Author: Charles Bailey bailey@newman.upenn.edu
748a9306	5	* Revised: 12-Dec-1994
a0d0e21e LW	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$find_image_symbol would use if
	38	* it were passed a given file specification. The file specification passed
	39	* to dl_expandspec() and dl_load_file() can be partial or complete, and can
	40	* use VMS or Unix syntax; these routines perform the necessary conversions.
	41	* In general, writers of perl extensions need only conform to the
	42	* procedures set out in the DynaLoader documentation, and let the details
	43	* be taken care of by the routines here and in DynaLoader.pm. If anyone
	44	* comes across any incompatibilities, please let me know. Thanks.
	45	*
	46	*/
	47
	48	#include "EXTERN.h"
	49	#include "perl.h"
	50	#include "XSUB.h"
	51
a0d0e21e	52	/* N.B.:
cdc73a10	53	* dl_debug and dl_last_error are static vars; you'll need to deal
a0d0e21e LW	54	* with them appropriately if you need context independence
	55	*/
	56
	57	#include <descrip.h>
	58	#include <fscndef.h>
	59	#include <lib$routines.h>
	60	#include <rms.h>
	61	#include <ssdef.h>
748a9306	62	#include <starlet.h>
a0d0e21e	63
b6837a3b CB	64	#if defined(VMS_WE_ARE_CASE_SENSITIVE)
	65	#define DL_CASE_SENSITIVE 1<<4
	66	#else
	67	#define DL_CASE_SENSITIVE 0
	68	#endif
	69
a0d0e21e LW	70	typedef unsigned long int vmssts;
	71
	72	struct libref {
	73	struct dsc$descriptor_s name;
	74	struct dsc$descriptor_s defspec;
	75	};
	76
cdc73a10 JH	77	typedef struct {
	78	AV * x_require_symbols;
	79	/* "Static" data for dl_expand_filespec() - This is static to save
a0d0e21e LW	80	* initialization on each call; if you need context-independence,
	81	* just make these auto variables in dl_expandspec() and dl_load_file()
	82	*/
cdc73a10 JH	83	char x_esa[NAM$C_MAXRSS];
	84	char x_rsa[NAM$C_MAXRSS];
	85	struct FAB x_fab;
	86	struct NAM x_nam;
	87	} my_cxtx_t; /* this must be named my_cxtx_t */
	88
	89	#define DL_CXT_EXTRA /* ask for dl_cxtx to be defined in dlutils.c */
	90	#include "dlutils.c" /* dl_debug, dl_last_error; SaveError not used */
	91
	92	#define dl_require_symbols (dl_cxtx.x_require_symbols)
	93	#define dl_esa (dl_cxtx.x_esa)
	94	#define dl_rsa (dl_cxtx.x_rsa)
	95	#define dl_fab (dl_cxtx.x_fab)
	96	#define dl_nam (dl_cxtx.x_nam)
	97
	98	/* $PutMsg action routine - records error message in dl_last_error */
a0d0e21e LW	99	static vmssts
	100	copy_errmsg(msg,unused)
	101	struct dsc$descriptor_s * msg;
	102	vmssts unused;
	103	{
ecdc15d9	104	dTHX;
cdc73a10	105	dMY_CXT;
748a9306	106	if ((msg->dsc$a_pointer) == '%') { / first line */
cdc73a10 JH	107	if (dl_last_error)
cdc73a10 JH	108	strncpy((dl_last_error = saferealloc(dl_last_error,msg->dsc$w_length+1)),
a0d0e21e LW	109	msg->dsc$a_pointer, msg->dsc$w_length);
a0d0e21e LW	110	else
cdc73a10	111	strncpy((dl_last_error = safemalloc(msg->dsc$w_length+1)),
a0d0e21e	112	msg->dsc$a_pointer, msg->dsc$w_length);
cdc73a10	113	dl_last_error[msg->dsc$w_length] = '\0';
a0d0e21e LW	114	}
a0d0e21e LW	115	else { /* continuation line */
cdc73a10 JH	116	int errlen = strlen(dl_last_error);
	117	dl_last_error = saferealloc(dl_last_error, errlen + msg->dsc$w_length + 2);
	118	dl_last_error[errlen] = '\n'; dl_last_error[errlen+1] = '\0';
	119	strncat(dl_last_error, msg->dsc$a_pointer, msg->dsc$w_length);
	120	dl_last_error[errlen+msg->dsc$w_length+1] = '\0';
a0d0e21e	121	}
2708a6a3	122	return 0;
a0d0e21e LW	123	}
	124
	125	/* Use $PutMsg to retrieve error message for failure status code */
	126	static void
	127	dl_set_error(sts,stv)
	128	vmssts sts;
	129	vmssts stv;
	130	{
748a9306	131	vmssts vec[3];
5c84aa53	132	dTHX;
a0d0e21e LW	133
	134	vec[0] = stv ? 2 : 1;
	135	vec[1] = sts; vec[2] = stv;
748a9306	136	_ckvmssts(sys$putmsg(vec,copy_errmsg,0,0));
a0d0e21e LW	137	}
a0d0e21e LW	138
2708a6a3	139	static unsigned int
	140	findsym_handler(void sig, void mech)
	141	{
5c84aa53	142	dTHX;
2708a6a3	143	unsigned long int myvec[8],args, usig = (unsigned long int ) sig;
	144	/* Be paranoid and assume signal vector passed in might be readonly */
	145	myvec[0] = args = usig[0] > 10 ? 9 : usig[0] - 1;
	146	while (--args) myvec[args] = usig[args];
	147	_ckvmssts(sys$putmsg(myvec,copy_errmsg,0,0));
cdc73a10	148	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "findsym_handler: received\n\t%s\n",dl_last_error));
2708a6a3	149	return SS$_CONTINUE;
	150	}
	151
	152	/* wrapper for lib$find_image_symbol, so signalled errors can be saved
	153	* for dl_error and then returned */
	154	static unsigned long int
	155	my_find_image_symbol(struct dsc$descriptor_s *imgname,
	156	struct dsc$descriptor_s *symname,
	157	void (**entry)(),
	158	struct dsc$descriptor_s *defspec)
	159	{
	160	unsigned long int retsts;
	161	VAXC$ESTABLISH(findsym_handler);
b6837a3b	162	retsts = lib$find_image_symbol(imgname,symname,entry,defspec,DL_CASE_SENSITIVE);
2708a6a3	163	return retsts;
	164	}
	165
	166
a0d0e21e	167	static void
cea2e8a9	168	dl_private_init(pTHX)
a0d0e21e	169	{
cea2e8a9	170	dl_generic_private_init(aTHX);
cdc73a10 JH	171	{
	172	dMY_CXT;
	173	dl_require_symbols = get_av("DynaLoader::dl_require_symbols", 0x4);
	174	/* Set up the static control blocks for dl_expand_filespec() */
	175	dl_fab = cc$rms_fab;
	176	dl_nam = cc$rms_nam;
	177	dl_fab.fab$l_nam = &dl_nam;
	178	dl_nam.nam$l_esa = dl_esa;
	179	dl_nam.nam$b_ess = sizeof dl_esa;
	180	dl_nam.nam$l_rsa = dl_rsa;
	181	dl_nam.nam$b_rss = sizeof dl_rsa;
	182	}
a0d0e21e LW	183	}
	184	MODULE = DynaLoader PACKAGE = DynaLoader
	185
	186	BOOT:
cea2e8a9	187	(void)dl_private_init(aTHX);
a0d0e21e	188
748a9306	189	void
a0d0e21e LW	190	dl_expandspec(filespec)
	191	char * filespec
	192	CODE:
	193	char vmsspec[NAM$C_MAXRSS], defspec[NAM$C_MAXRSS];
	194	size_t deflen;
	195	vmssts sts;
cdc73a10	196	dMY_CXT;
a0d0e21e LW	197
a0d0e21e LW	198	tovmsspec(filespec,vmsspec);
cdc73a10 JH	199	dl_fab.fab$l_fna = vmsspec;
	200	dl_fab.fab$b_fns = strlen(vmsspec);
	201	dl_fab.fab$l_dna = 0;
	202	dl_fab.fab$b_dns = 0;
146174a9	203	DLDEBUG(1,PerlIO_printf(Perl_debug_log, "dl_expand_filespec(%s):\n",vmsspec));
a0d0e21e	204	/* On the first pass, just parse the specification string */
cdc73a10 JH	205	dl_nam.nam$b_nop = NAM$M_SYNCHK;
cdc73a10 JH	206	sts = sys$parse(&dl_fab);
146174a9	207	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tSYNCHK sys$parse = %d\n",sts));
a0d0e21e	208	if (!(sts & 1)) {
cdc73a10	209	dl_set_error(dl_fab.fab$l_sts,dl_fab.fab$l_stv);
6b88bc9c	210	ST(0) = &PL_sv_undef;
a0d0e21e LW	211	}
	212	else {
	213	/* Now set up a default spec - everything but the name */
cdc73a10 JH	214	deflen = dl_nam.nam$l_name - dl_esa;
	215	memcpy(defspec,dl_esa,deflen);
	216	memcpy(defspec+deflen,dl_nam.nam$l_type,
	217	dl_nam.nam$b_type + dl_nam.nam$b_ver);
	218	deflen += dl_nam.nam$b_type + dl_nam.nam$b_ver;
	219	memcpy(vmsspec,dl_nam.nam$l_name,dl_nam.nam$b_name);
146174a9	220	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tsplit filespec: name = %.s, default = %.s\n",
cdc73a10	221	dl_nam.nam$b_name,vmsspec,deflen,defspec));
a0d0e21e	222	/* . . . and go back to expand it */
cdc73a10 JH	223	dl_nam.nam$b_nop = 0;
	224	dl_fab.fab$l_dna = defspec;
	225	dl_fab.fab$b_dns = deflen;
	226	dl_fab.fab$b_fns = dl_nam.nam$b_name;
	227	sts = sys$parse(&dl_fab);
146174a9	228	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tname/default sys$parse = %d\n",sts));
a0d0e21e	229	if (!(sts & 1)) {
cdc73a10	230	dl_set_error(dl_fab.fab$l_sts,dl_fab.fab$l_stv);
6b88bc9c	231	ST(0) = &PL_sv_undef;
a0d0e21e LW	232	}
	233	else {
	234	/* Now find the actual file */
cdc73a10	235	sts = sys$search(&dl_fab);
146174a9	236	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tsys$search = %d\n",sts));
2708a6a3	237	if (!(sts & 1)) {
cdc73a10	238	dl_set_error(dl_fab.fab$l_sts,dl_fab.fab$l_stv);
6b88bc9c	239	ST(0) = &PL_sv_undef;
a0d0e21e LW	240	}
a0d0e21e LW	241	else {
cdc73a10	242	ST(0) = sv_2mortal(newSVpvn(dl_nam.nam$l_rsa,dl_nam.nam$b_rsl));
146174a9	243	DLDEBUG(1,PerlIO_printf(Perl_debug_log, "\tresult = \\%.*s\\\n",
cdc73a10	244	dl_nam.nam$b_rsl,dl_nam.nam$l_rsa));
a0d0e21e LW	245	}
	246	}
	247	}
	248
748a9306	249	void
f86702cc	250	dl_load_file(filespec, flags)
f86702cc	251	char * filespec
ff7f3c60 NIS	252	int flags
ff7f3c60 NIS	253	PREINIT:
626727d5	254	dTHX;
ecdc15d9	255	dMY_CXT;
a0d0e21e	256	char vmsspec[NAM$C_MAXRSS];
a0d0e21e LW	257	SV reqSV, *reqSVhndl;
	258	STRLEN deflen;
	259	struct dsc$descriptor_s
	260	specdsc = {0, DSC$K_DTYPE_T, DSC$K_CLASS_S, 0},
	261	symdsc = {0, DSC$K_DTYPE_T, DSC$K_CLASS_S, 0};
	262	struct fscnlst {
	263	unsigned short int len;
	264	unsigned short int code;
	265	char *string;
748a9306	266	} namlst[2] = {{0,FSCN$_NAME,0},{0,0,0}};
a0d0e21e LW	267	struct libref *dlptr;
a0d0e21e LW	268	vmssts sts, failed = 0;
2708a6a3	269	void (*entry)();
ff7f3c60	270	CODE:
a0d0e21e	271
146174a9	272	DLDEBUG(1,PerlIO_printf(Perl_debug_log, "dl_load_file(%s,%x):\n", filespec,flags));
a0d0e21e LW	273	specdsc.dsc$a_pointer = tovmsspec(filespec,vmsspec);
a0d0e21e LW	274	specdsc.dsc$w_length = strlen(specdsc.dsc$a_pointer);
146174a9	275	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tVMS-ified filespec is %s\n",
a0d0e21e	276	specdsc.dsc$a_pointer));
fc36a67e	277	New(1399,dlptr,1,struct libref);
a0d0e21e LW	278	dlptr->name.dsc$b_dtype = dlptr->defspec.dsc$b_dtype = DSC$K_DTYPE_T;
	279	dlptr->name.dsc$b_class = dlptr->defspec.dsc$b_class = DSC$K_CLASS_S;
	280	sts = sys$filescan(&specdsc,namlst,0);
146174a9	281	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tsys$filescan: returns %d, name is %.*s\n",
a0d0e21e LW	282	sts,namlst[0].len,namlst[0].string));
	283	if (!(sts & 1)) {
	284	failed = 1;
	285	dl_set_error(sts,0);
	286	}
	287	else {
	288	dlptr->name.dsc$w_length = namlst[0].len;
	289	dlptr->name.dsc$a_pointer = savepvn(namlst[0].string,namlst[0].len);
	290	dlptr->defspec.dsc$w_length = specdsc.dsc$w_length - namlst[0].len;
8c52afec	291	New(1097, dlptr->defspec.dsc$a_pointer, dlptr->defspec.dsc$w_length + 1, char);
a0d0e21e LW	292	deflen = namlst[0].string - specdsc.dsc$a_pointer;
	293	memcpy(dlptr->defspec.dsc$a_pointer,specdsc.dsc$a_pointer,deflen);
	294	memcpy(dlptr->defspec.dsc$a_pointer + deflen,
	295	namlst[0].string + namlst[0].len,
	296	dlptr->defspec.dsc$w_length - deflen);
146174a9	297	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tlibref = name: %s, defspec: %.*s\n",
a0d0e21e LW	298	dlptr->name.dsc$a_pointer,
	299	dlptr->defspec.dsc$w_length,
	300	dlptr->defspec.dsc$a_pointer));
8e07c86e	301	if (!(reqSVhndl = av_fetch(dl_require_symbols,0,FALSE)) \|\| !(reqSV = *reqSVhndl)) {
146174a9	302	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\t@dl_require_symbols empty, returning untested libref\n"));
a0d0e21e LW	303	}
	304	else {
	305	symdsc.dsc$w_length = SvCUR(reqSV);
	306	symdsc.dsc$a_pointer = SvPVX(reqSV);
146174a9	307	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\t$dl_require_symbols[0] = %.*s\n",
a0d0e21e	308	symdsc.dsc$w_length, symdsc.dsc$a_pointer));
2708a6a3	309	sts = my_find_image_symbol(&(dlptr->name),&symdsc,
a0d0e21e	310	&entry,&(dlptr->defspec));
146174a9	311	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tlib$find_image_symbol returns %d\n",sts));
a0d0e21e LW	312	if (!(sts&1)) {
	313	failed = 1;
	314	dl_set_error(sts,0);
	315	}
	316	}
	317	}
	318
	319	if (failed) {
	320	Safefree(dlptr->name.dsc$a_pointer);
	321	Safefree(dlptr->defspec.dsc$a_pointer);
	322	Safefree(dlptr);
6b88bc9c	323	ST(0) = &PL_sv_undef;
a0d0e21e LW	324	}
a0d0e21e LW	325	else {
c529f79d	326	ST(0) = sv_2mortal(newSViv(PTR2IV(dlptr)));
a0d0e21e LW	327	}
	328
	329
748a9306	330	void
a0d0e21e LW	331	dl_find_symbol(librefptr,symname)
	332	void * librefptr
	333	SV * symname
	334	CODE:
	335	struct libref thislib = ((struct libref )librefptr);
	336	struct dsc$descriptor_s
	337	symdsc = {SvCUR(symname),DSC$K_DTYPE_T,DSC$K_CLASS_S,SvPVX(symname)};
	338	void (*entry)();
	339	vmssts sts;
	340
146174a9	341	DLDEBUG(1,PerlIO_printf(Perl_debug_log, "dl_find_dymbol(%.s,%.s):\n",
a0d0e21e LW	342	thislib.name.dsc$w_length, thislib.name.dsc$a_pointer,
a0d0e21e LW	343	symdsc.dsc$w_length,symdsc.dsc$a_pointer));
2708a6a3	344	sts = my_find_image_symbol(&(thislib.name),&symdsc,
2708a6a3	345	&entry,&(thislib.defspec));
146174a9 CB	346	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tlib$find_image_symbol returns %d\n",sts));
146174a9 CB	347	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tentry point is %d\n",
a0d0e21e LW	348	(unsigned long int) entry));
a0d0e21e LW	349	if (!(sts & 1)) {
2708a6a3	350	/* error message already saved by findsym_handler */
6b88bc9c	351	ST(0) = &PL_sv_undef;
a0d0e21e	352	}
c529f79d	353	else ST(0) = sv_2mortal(newSViv(PTR2IV(entry)));
a0d0e21e LW	354
	355
	356	void
	357	dl_undef_symbols()
	358	PPCODE:
	359
	360
	361	# These functions should not need changing on any platform:
	362
	363	void
	364	dl_install_xsub(perl_name, symref, filename="$Package")
	365	char * perl_name
	366	void * symref
	367	char * filename
	368	CODE:
146174a9	369	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "dl_install_xsub(name=%s, symref=%x)\n",
a0d0e21e	370	perl_name, symref));
cea2e8a9 GS	371	ST(0) = sv_2mortal(newRV((SV*)newXS(perl_name,
	372	(void()(pTHX_ CV ))symref,
	373	filename)));
a0d0e21e LW	374
	375
	376	char *
	377	dl_error()
	378	CODE:
cdc73a10 JH	379	dMY_CXT;
cdc73a10 JH	380	RETVAL = dl_last_error ;
a0d0e21e LW	381	OUTPUT:
	382	RETVAL
	383
	384	# end.