[p5sagit/p5-mst-13.2.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;
{
    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;
    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)();
    dMY_CXT;
    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	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	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$find_image_symbol would use if
	38	* it were passed a given file specification. The file specification passed
	39	* to dl_expandspec() and dl_load_file() can be partial or complete, and can
	40	* use VMS or Unix syntax; these routines perform the necessary conversions.
	41	* In general, writers of perl extensions need only conform to the
	42	* procedures set out in the DynaLoader documentation, and let the details
	43	* be taken care of by the routines here and in DynaLoader.pm. If anyone
	44	* comes across any incompatibilities, please let me know. Thanks.
	45	*
	46	*/
	47
	48	#include "EXTERN.h"
	49	#include "perl.h"
	50	#include "XSUB.h"
	51
a0d0e21e	52	/* N.B.:
cdc73a10	53	* dl_debug and dl_last_error are static vars; you'll need to deal
a0d0e21e	54	* with them appropriately if you need context independence
	55	*/
	56
	57	#include <descrip.h>
	58	#include <fscndef.h>
	59	#include <lib$routines.h>
	60	#include <rms.h>
	61	#include <ssdef.h>
748a9306	62	#include <starlet.h>
a0d0e21e	63
b6837a3b	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	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	77	typedef struct {
	78	AV * x_require_symbols;
	79	/* "Static" data for dl_expand_filespec() - This is static to save
a0d0e21e	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	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	/* $PutMsg action routine - records error message in dl_last_error */
a0d0e21e	99	static vmssts
	100	copy_errmsg(msg,unused)
	101	struct dsc$descriptor_s * msg;
	102	vmssts unused;
	103	{
cdc73a10	104	dMY_CXT;
748a9306	105	if ((msg->dsc$a_pointer) == '%') { / first line */
cdc73a10	106	if (dl_last_error)
cdc73a10	107	strncpy((dl_last_error = saferealloc(dl_last_error,msg->dsc$w_length+1)),
a0d0e21e	108	msg->dsc$a_pointer, msg->dsc$w_length);
a0d0e21e	109	else
cdc73a10	110	strncpy((dl_last_error = safemalloc(msg->dsc$w_length+1)),
a0d0e21e	111	msg->dsc$a_pointer, msg->dsc$w_length);
cdc73a10	112	dl_last_error[msg->dsc$w_length] = '\0';
a0d0e21e	113	}
a0d0e21e	114	else { /* continuation line */
cdc73a10	115	int errlen = strlen(dl_last_error);
	116	dl_last_error = saferealloc(dl_last_error, errlen + msg->dsc$w_length + 2);
	117	dl_last_error[errlen] = '\n'; dl_last_error[errlen+1] = '\0';
	118	strncat(dl_last_error, msg->dsc$a_pointer, msg->dsc$w_length);
	119	dl_last_error[errlen+msg->dsc$w_length+1] = '\0';
a0d0e21e	120	}
2708a6a3	121	return 0;
a0d0e21e	122	}
	123
	124	/* Use $PutMsg to retrieve error message for failure status code */
	125	static void
	126	dl_set_error(sts,stv)
	127	vmssts sts;
	128	vmssts stv;
	129	{
748a9306	130	vmssts vec[3];
5c84aa53	131	dTHX;
a0d0e21e	132
	133	vec[0] = stv ? 2 : 1;
	134	vec[1] = sts; vec[2] = stv;
748a9306	135	_ckvmssts(sys$putmsg(vec,copy_errmsg,0,0));
a0d0e21e	136	}
a0d0e21e	137
2708a6a3	138	static unsigned int
	139	findsym_handler(void sig, void mech)
	140	{
5c84aa53	141	dTHX;
2708a6a3	142	unsigned long int myvec[8],args, usig = (unsigned long int ) sig;
	143	/* Be paranoid and assume signal vector passed in might be readonly */
	144	myvec[0] = args = usig[0] > 10 ? 9 : usig[0] - 1;
	145	while (--args) myvec[args] = usig[args];
	146	_ckvmssts(sys$putmsg(myvec,copy_errmsg,0,0));
cdc73a10	147	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "findsym_handler: received\n\t%s\n",dl_last_error));
2708a6a3	148	return SS$_CONTINUE;
	149	}
	150
	151	/* wrapper for lib$find_image_symbol, so signalled errors can be saved
	152	* for dl_error and then returned */
	153	static unsigned long int
	154	my_find_image_symbol(struct dsc$descriptor_s *imgname,
	155	struct dsc$descriptor_s *symname,
	156	void (**entry)(),
	157	struct dsc$descriptor_s *defspec)
	158	{
	159	unsigned long int retsts;
	160	VAXC$ESTABLISH(findsym_handler);
b6837a3b	161	retsts = lib$find_image_symbol(imgname,symname,entry,defspec,DL_CASE_SENSITIVE);
2708a6a3	162	return retsts;
	163	}
	164
	165
a0d0e21e	166	static void
cea2e8a9	167	dl_private_init(pTHX)
a0d0e21e	168	{
cea2e8a9	169	dl_generic_private_init(aTHX);
cdc73a10	170	{
	171	dMY_CXT;
	172	dl_require_symbols = get_av("DynaLoader::dl_require_symbols", 0x4);
	173	/* Set up the static control blocks for dl_expand_filespec() */
	174	dl_fab = cc$rms_fab;
	175	dl_nam = cc$rms_nam;
	176	dl_fab.fab$l_nam = &dl_nam;
	177	dl_nam.nam$l_esa = dl_esa;
	178	dl_nam.nam$b_ess = sizeof dl_esa;
	179	dl_nam.nam$l_rsa = dl_rsa;
	180	dl_nam.nam$b_rss = sizeof dl_rsa;
	181	}
a0d0e21e	182	}
	183	MODULE = DynaLoader PACKAGE = DynaLoader
	184
	185	BOOT:
cea2e8a9	186	(void)dl_private_init(aTHX);
a0d0e21e	187
748a9306	188	void
a0d0e21e	189	dl_expandspec(filespec)
	190	char * filespec
	191	CODE:
	192	char vmsspec[NAM$C_MAXRSS], defspec[NAM$C_MAXRSS];
	193	size_t deflen;
	194	vmssts sts;
cdc73a10	195	dMY_CXT;
a0d0e21e	196
a0d0e21e	197	tovmsspec(filespec,vmsspec);
cdc73a10	198	dl_fab.fab$l_fna = vmsspec;
	199	dl_fab.fab$b_fns = strlen(vmsspec);
	200	dl_fab.fab$l_dna = 0;
	201	dl_fab.fab$b_dns = 0;
146174a9	202	DLDEBUG(1,PerlIO_printf(Perl_debug_log, "dl_expand_filespec(%s):\n",vmsspec));
a0d0e21e	203	/* On the first pass, just parse the specification string */
cdc73a10	204	dl_nam.nam$b_nop = NAM$M_SYNCHK;
cdc73a10	205	sts = sys$parse(&dl_fab);
146174a9	206	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tSYNCHK sys$parse = %d\n",sts));
a0d0e21e	207	if (!(sts & 1)) {
cdc73a10	208	dl_set_error(dl_fab.fab$l_sts,dl_fab.fab$l_stv);
6b88bc9c	209	ST(0) = &PL_sv_undef;
a0d0e21e	210	}
	211	else {
	212	/* Now set up a default spec - everything but the name */
cdc73a10	213	deflen = dl_nam.nam$l_name - dl_esa;
	214	memcpy(defspec,dl_esa,deflen);
	215	memcpy(defspec+deflen,dl_nam.nam$l_type,
	216	dl_nam.nam$b_type + dl_nam.nam$b_ver);
	217	deflen += dl_nam.nam$b_type + dl_nam.nam$b_ver;
	218	memcpy(vmsspec,dl_nam.nam$l_name,dl_nam.nam$b_name);
146174a9	219	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tsplit filespec: name = %.s, default = %.s\n",
cdc73a10	220	dl_nam.nam$b_name,vmsspec,deflen,defspec));
a0d0e21e	221	/* . . . and go back to expand it */
cdc73a10	222	dl_nam.nam$b_nop = 0;
	223	dl_fab.fab$l_dna = defspec;
	224	dl_fab.fab$b_dns = deflen;
	225	dl_fab.fab$b_fns = dl_nam.nam$b_name;
	226	sts = sys$parse(&dl_fab);
146174a9	227	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tname/default sys$parse = %d\n",sts));
a0d0e21e	228	if (!(sts & 1)) {
cdc73a10	229	dl_set_error(dl_fab.fab$l_sts,dl_fab.fab$l_stv);
6b88bc9c	230	ST(0) = &PL_sv_undef;
a0d0e21e	231	}
	232	else {
	233	/* Now find the actual file */
cdc73a10	234	sts = sys$search(&dl_fab);
146174a9	235	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tsys$search = %d\n",sts));
2708a6a3	236	if (!(sts & 1)) {
cdc73a10	237	dl_set_error(dl_fab.fab$l_sts,dl_fab.fab$l_stv);
6b88bc9c	238	ST(0) = &PL_sv_undef;
a0d0e21e	239	}
a0d0e21e	240	else {
cdc73a10	241	ST(0) = sv_2mortal(newSVpvn(dl_nam.nam$l_rsa,dl_nam.nam$b_rsl));
146174a9	242	DLDEBUG(1,PerlIO_printf(Perl_debug_log, "\tresult = \\%.*s\\\n",
cdc73a10	243	dl_nam.nam$b_rsl,dl_nam.nam$l_rsa));
a0d0e21e	244	}
	245	}
	246	}
	247
748a9306	248	void
f86702cc	249	dl_load_file(filespec, flags)
f86702cc	250	char * filespec
ff7f3c60	251	int flags
ff7f3c60	252	PREINIT:
626727d5	253	dTHX;
a0d0e21e	254	char vmsspec[NAM$C_MAXRSS];
a0d0e21e	255	SV reqSV, *reqSVhndl;
	256	STRLEN deflen;
	257	struct dsc$descriptor_s
	258	specdsc = {0, DSC$K_DTYPE_T, DSC$K_CLASS_S, 0},
	259	symdsc = {0, DSC$K_DTYPE_T, DSC$K_CLASS_S, 0};
	260	struct fscnlst {
	261	unsigned short int len;
	262	unsigned short int code;
	263	char *string;
748a9306	264	} namlst[2] = {{0,FSCN$_NAME,0},{0,0,0}};
a0d0e21e	265	struct libref *dlptr;
a0d0e21e	266	vmssts sts, failed = 0;
2708a6a3	267	void (*entry)();
cdc73a10	268	dMY_CXT;
ff7f3c60	269	CODE:
a0d0e21e	270
146174a9	271	DLDEBUG(1,PerlIO_printf(Perl_debug_log, "dl_load_file(%s,%x):\n", filespec,flags));
a0d0e21e	272	specdsc.dsc$a_pointer = tovmsspec(filespec,vmsspec);
a0d0e21e	273	specdsc.dsc$w_length = strlen(specdsc.dsc$a_pointer);
146174a9	274	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tVMS-ified filespec is %s\n",
a0d0e21e	275	specdsc.dsc$a_pointer));
fc36a67e	276	New(1399,dlptr,1,struct libref);
a0d0e21e	277	dlptr->name.dsc$b_dtype = dlptr->defspec.dsc$b_dtype = DSC$K_DTYPE_T;
	278	dlptr->name.dsc$b_class = dlptr->defspec.dsc$b_class = DSC$K_CLASS_S;
	279	sts = sys$filescan(&specdsc,namlst,0);
146174a9	280	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tsys$filescan: returns %d, name is %.*s\n",
a0d0e21e	281	sts,namlst[0].len,namlst[0].string));
	282	if (!(sts & 1)) {
	283	failed = 1;
	284	dl_set_error(sts,0);
	285	}
	286	else {
	287	dlptr->name.dsc$w_length = namlst[0].len;
	288	dlptr->name.dsc$a_pointer = savepvn(namlst[0].string,namlst[0].len);
	289	dlptr->defspec.dsc$w_length = specdsc.dsc$w_length - namlst[0].len;
8c52afec	290	New(1097, dlptr->defspec.dsc$a_pointer, dlptr->defspec.dsc$w_length + 1, char);
a0d0e21e	291	deflen = namlst[0].string - specdsc.dsc$a_pointer;
	292	memcpy(dlptr->defspec.dsc$a_pointer,specdsc.dsc$a_pointer,deflen);
	293	memcpy(dlptr->defspec.dsc$a_pointer + deflen,
	294	namlst[0].string + namlst[0].len,
	295	dlptr->defspec.dsc$w_length - deflen);
146174a9	296	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tlibref = name: %s, defspec: %.*s\n",
a0d0e21e	297	dlptr->name.dsc$a_pointer,
	298	dlptr->defspec.dsc$w_length,
	299	dlptr->defspec.dsc$a_pointer));
8e07c86e	300	if (!(reqSVhndl = av_fetch(dl_require_symbols,0,FALSE)) \|\| !(reqSV = *reqSVhndl)) {
146174a9	301	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\t@dl_require_symbols empty, returning untested libref\n"));
a0d0e21e	302	}
	303	else {
	304	symdsc.dsc$w_length = SvCUR(reqSV);
	305	symdsc.dsc$a_pointer = SvPVX(reqSV);
146174a9	306	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\t$dl_require_symbols[0] = %.*s\n",
a0d0e21e	307	symdsc.dsc$w_length, symdsc.dsc$a_pointer));
2708a6a3	308	sts = my_find_image_symbol(&(dlptr->name),&symdsc,
a0d0e21e	309	&entry,&(dlptr->defspec));
146174a9	310	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tlib$find_image_symbol returns %d\n",sts));
a0d0e21e	311	if (!(sts&1)) {
	312	failed = 1;
	313	dl_set_error(sts,0);
	314	}
	315	}
	316	}
	317
	318	if (failed) {
	319	Safefree(dlptr->name.dsc$a_pointer);
	320	Safefree(dlptr->defspec.dsc$a_pointer);
	321	Safefree(dlptr);
6b88bc9c	322	ST(0) = &PL_sv_undef;
a0d0e21e	323	}
a0d0e21e	324	else {
c529f79d	325	ST(0) = sv_2mortal(newSViv(PTR2IV(dlptr)));
a0d0e21e	326	}
	327
	328
748a9306	329	void
a0d0e21e	330	dl_find_symbol(librefptr,symname)
	331	void * librefptr
	332	SV * symname
	333	CODE:
	334	struct libref thislib = ((struct libref )librefptr);
	335	struct dsc$descriptor_s
	336	symdsc = {SvCUR(symname),DSC$K_DTYPE_T,DSC$K_CLASS_S,SvPVX(symname)};
	337	void (*entry)();
	338	vmssts sts;
	339
146174a9	340	DLDEBUG(1,PerlIO_printf(Perl_debug_log, "dl_find_dymbol(%.s,%.s):\n",
a0d0e21e	341	thislib.name.dsc$w_length, thislib.name.dsc$a_pointer,
a0d0e21e	342	symdsc.dsc$w_length,symdsc.dsc$a_pointer));
2708a6a3	343	sts = my_find_image_symbol(&(thislib.name),&symdsc,
2708a6a3	344	&entry,&(thislib.defspec));
146174a9	345	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tlib$find_image_symbol returns %d\n",sts));
146174a9	346	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tentry point is %d\n",
a0d0e21e	347	(unsigned long int) entry));
a0d0e21e	348	if (!(sts & 1)) {
2708a6a3	349	/* error message already saved by findsym_handler */
6b88bc9c	350	ST(0) = &PL_sv_undef;
a0d0e21e	351	}
c529f79d	352	else ST(0) = sv_2mortal(newSViv(PTR2IV(entry)));
a0d0e21e	353
	354
	355	void
	356	dl_undef_symbols()
	357	PPCODE:
	358
	359
	360	# These functions should not need changing on any platform:
	361
	362	void
	363	dl_install_xsub(perl_name, symref, filename="$Package")
	364	char * perl_name
	365	void * symref
	366	char * filename
	367	CODE:
146174a9	368	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "dl_install_xsub(name=%s, symref=%x)\n",
a0d0e21e	369	perl_name, symref));
cea2e8a9	370	ST(0) = sv_2mortal(newRV((SV*)newXS(perl_name,
	371	(void()(pTHX_ CV ))symref,
	372	filename)));
a0d0e21e	373
	374
	375	char *
	376	dl_error()
	377	CODE:
cdc73a10	378	dMY_CXT;
cdc73a10	379	RETVAL = dl_last_error ;
a0d0e21e	380	OUTPUT:
	381	RETVAL
	382
	383	# end.