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#include <stdio.h>
#include <descrip.h>
#include <starlet.h>
#include <ssdef.h>
#include <stsdef.h>
#include <lnmdef.h>
#include <libdef.h>
#include <lib$routines>
#include <rmsdef.h>
#include <fabdef.h>
#include <namdef.h>
static int error_status = SS$_NORMAL;
static char error_buffer[256];
static char getenv_buffer[256];
typedef struct
{
struct dsc$descriptor_s fnmdes;
struct dsc$descriptor_s imgdes;
struct dsc$descriptor_s symdes;
char filename[NAM$C_MAXRSS];
} vms_dl;
int vms_dlsym (vms_dl *, void **, int);
void * lt_dlsym (void *, const char *);
void lt_dlinit (void)
{
}
void * lt_dlopen (const char *filename)
{
vms_dl *dh;
int status;
struct FAB imgfab;
struct NAM imgnam;
static char defimg[] = "SYS$SHARE:.EXE";
if (filename == NULL)
{
error_status = SS$_UNSUPPORTED;
return NULL;
}
dh = (vms_dl *)malloc (sizeof (vms_dl));
if (dh == NULL)
{
error_status = SS$_INSFMEM;
return NULL;
}
imgfab = cc$rms_fab;
imgfab.fab$l_fna = filename;
imgfab.fab$b_fns = strlen (filename);
imgfab.fab$w_ifi = 0;
imgfab.fab$l_dna = defimg;
imgfab.fab$b_dns = sizeof (defimg);
imgfab.fab$l_fop = FAB$M_NAM;
imgfab.fab$l_nam = &imgnam;
imgnam = cc$rms_nam;
imgnam.nam$l_esa = dh->filename;
imgnam.nam$b_ess = NAM$C_MAXRSS;
status = sys$parse (&imgfab);
if (!($VMS_STATUS_SUCCESS(status)))
{
error_status = status;
return NULL;
}
dh->fnmdes.dsc$b_dtype = DSC$K_DTYPE_T;
dh->fnmdes.dsc$b_class = DSC$K_CLASS_S;
dh->fnmdes.dsc$a_pointer = imgnam.nam$l_name;
dh->fnmdes.dsc$w_length = imgnam.nam$b_name;
dh->imgdes.dsc$b_dtype = DSC$K_DTYPE_T;
dh->imgdes.dsc$b_class = DSC$K_CLASS_S;
dh->imgdes.dsc$a_pointer = dh->filename;
dh->imgdes.dsc$w_length = imgnam.nam$b_esl;
/*
** Attempt to load a symbol at this stage to
** validate that the shared file can be loaded
*/
lt_dlsym (dh, "Fake_Symbol_Name");
if (!((error_status ^ LIB$_KEYNOTFOU) & ~7)) error_status = SS$_NORMAL;
if (!($VMS_STATUS_SUCCESS(error_status)))
{
free (dh);
return NULL;
}
return dh;
}
int lt_dlclose (void *handle)
{
free (handle);
return 0;
}
void * lt_dlsym (void *handle, const char *name)
{
vms_dl *dh;
void *ptr;
int status, flags;
dh = (vms_dl *)handle;
if (!dh) return NULL;
dh->symdes.dsc$b_dtype = DSC$K_DTYPE_T;
dh->symdes.dsc$b_class = DSC$K_CLASS_S;
dh->symdes.dsc$a_pointer = name;
dh->symdes.dsc$w_length = strlen (name);
/* firstly attempt with flags set to 0 case insensitive */
flags = 0;
status = vms_dlsym (dh, &ptr, flags);
if (!($VMS_STATUS_SUCCESS(status)))
{
/*
** Try again with mixed case flag set
*/
flags = 0x10;
status = vms_dlsym (dh, &ptr, flags);
if (!($VMS_STATUS_SUCCESS(status)))
{
error_status = status;
return NULL;
}
}
return ptr;
}
int vms_dlsym (
vms_dl *dh,
void **ptr,
int flags)
{
LIB$ESTABLISH (LIB$SIG_TO_RET);
return LIB$FIND_IMAGE_SYMBOL (&dh->fnmdes, &dh->symdes, ptr, &dh->imgdes, flags);
}
const char *lt_dlerror (void)
{
struct dsc$descriptor desc;
short outlen;
int status;
if (($VMS_STATUS_SUCCESS(error_status))) return NULL;
desc.dsc$b_dtype = DSC$K_DTYPE_T;
desc.dsc$b_class = DSC$K_CLASS_S;
desc.dsc$a_pointer = error_buffer;
desc.dsc$w_length = sizeof (error_buffer);
status = sys$getmsg (error_status, &outlen, &desc, 15, 0);
if ($VMS_STATUS_SUCCESS(status)) error_buffer[outlen] = '\0';
else sprintf (error_buffer, "OpenVMS exit status %8X", error_status);
error_status = SS$_NORMAL;
return (error_buffer);
}
struct itemlist3 {
unsigned short cbbuf;
unsigned short item;
void *buf;
unsigned short *pcbbuf;
};
char * getvmsenv (char *symbol)
{
int status;
unsigned short cbvalue;
$DESCRIPTOR (logicalnametable, "LNM$FILE_DEV");
struct dsc$descriptor_s logicalname;
struct itemlist3 itemlist[2];
logicalname.dsc$w_length = strlen (symbol);
logicalname.dsc$b_dtype = DSC$K_DTYPE_T;
logicalname.dsc$b_class = DSC$K_CLASS_S;
logicalname.dsc$a_pointer = symbol;
itemlist[0].cbbuf = sizeof (getenv_buffer) -1;
itemlist[0].item = LNM$_STRING;
itemlist[0].buf = getenv_buffer;
itemlist[0].pcbbuf = &cbvalue;
itemlist[1].cbbuf = 0;
itemlist[1].item = 0;
itemlist[1].buf = 0;
itemlist[1].pcbbuf = 0;
status = SYS$TRNLNM (0, &logicalnametable, &logicalname, 0, itemlist);
if (!($VMS_STATUS_SUCCESS(status))) return NULL;
if (cbvalue > 0)
{
getenv_buffer[cbvalue] = '\0';
return getenv_buffer;
}
return NULL;
}
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