#if defined( __VMS) && !defined( OPENSSL_NO_DECC_INIT) && \
 defined( __DECC) && !defined( __VAX) && (__CRTL_VER >= 70301000)
# define USE_DECC_INIT 1
#endif

#ifdef USE_DECC_INIT

/*-
 * 2010-04-26 SMS.
 *
 *----------------------------------------------------------------------
 *
 *       decc_init()
 *
 *    On non-VAX systems, uses LIB$INITIALIZE to set a collection of C
 *    RTL features without using the DECC$* logical name method.
 *
 *----------------------------------------------------------------------
 */

#include <stdio.h>
#include <stdlib.h>
#include <unixlib.h>


/* Global storage. */

/* Flag to sense if decc_init() was called. */

int decc_init_done = -1;


/* Structure to hold a DECC$* feature name and its desired value. */

typedef struct
{
    char *name;
    int value;
} decc_feat_t;


/* Array of DECC$* feature names and their desired values.
 * Note: DECC$ARGV_PARSE_STYLE is the urgent one.
 */

decc_feat_t decc_feat_array[] =
{
 /* Preserve command-line case with SET PROCESS/PARSE_STYLE=EXTENDED */
 { "DECC$ARGV_PARSE_STYLE", 1 },

 /* Preserve case for file names on ODS5 disks. */
 { "DECC$EFS_CASE_PRESERVE", 1 },

 /* Enable multiple dots (and most characters) in ODS5 file names,
  * while preserving VMS-ness of ";version".
  */
 { "DECC$EFS_CHARSET", 1 },

 /* List terminator. */
 { (char *)NULL, 0 }
};


/* LIB$INITIALIZE initialization function. */

static void decc_init( void)
{
    char *openssl_debug_decc_init;
    int verbose = 0;
    int feat_index;
    int feat_value;
    int feat_value_max;
    int feat_value_min;
    int i;
    int sts;

    /* Get debug option. */
    openssl_debug_decc_init = getenv( "OPENSSL_DEBUG_DECC_INIT");
    if (openssl_debug_decc_init != NULL)
    {
        verbose = strtol( openssl_debug_decc_init, NULL, 10);
        if (verbose <= 0)
        {
            verbose = 1;
        }
    }

    /* Set the global flag to indicate that LIB$INITIALIZE worked. */
    decc_init_done = 1;

    /* Loop through all items in the decc_feat_array[]. */

    for (i = 0; decc_feat_array[ i].name != NULL; i++)
    {
        /* Get the feature index. */
        feat_index = decc$feature_get_index( decc_feat_array[ i].name);
        if (feat_index >= 0)
        {
            /* Valid item.  Collect its properties. */
            feat_value = decc$feature_get_value( feat_index, 1);
            feat_value_min = decc$feature_get_value( feat_index, 2);
            feat_value_max = decc$feature_get_value( feat_index, 3);

            /* Check the validity of our desired value. */
            if ((decc_feat_array[ i].value >= feat_value_min) &&
             (decc_feat_array[ i].value <= feat_value_max))
            {
                /* Valid value.  Set it if necessary. */
                if (feat_value != decc_feat_array[ i].value)
                {
                    sts = decc$feature_set_value( feat_index,
                     1,
                     decc_feat_array[ i].value);

                     if (verbose > 1)
                     {
                         fprintf( stderr, " %s = %d, sts = %d.\n",
                          decc_feat_array[ i].name,
                          decc_feat_array[ i].value,
                          sts);
                     }
                }
            }
            else
            {
                /* Invalid DECC feature value. */
                fprintf( stderr,
                 " INVALID DECC$FEATURE VALUE, %d: %d <= %s <= %d.\n",
                 feat_value,
                 feat_value_min, decc_feat_array[ i].name, feat_value_max);
            }
        }
        else
        {
            /* Invalid DECC feature name. */
            fprintf( stderr,
             " UNKNOWN DECC$FEATURE: %s.\n", decc_feat_array[ i].name);
        }
    }

    if (verbose > 0)
    {
        fprintf( stderr, " DECC_INIT complete.\n");
    }
}

/* Get "decc_init()" into a valid, loaded LIB$INITIALIZE PSECT. */

#pragma nostandard

/* Establish the LIB$INITIALIZE PSECTs, with proper alignment and
 * other attributes.  Note that "nopic" is significant only on VAX.
 */
#pragma extern_model save

#if __INITIAL_POINTER_SIZE == 64
# define PSECT_ALIGN 3
#else
# define PSECT_ALIGN 2
#endif

#pragma extern_model strict_refdef "LIB$INITIALIZ" PSECT_ALIGN, nopic, nowrt
const int spare[ 8] = { 0 };

#pragma extern_model strict_refdef "LIB$INITIALIZE" PSECT_ALIGN, nopic, nowrt
void (*const x_decc_init)() = decc_init;

#pragma extern_model restore

/* Fake reference to ensure loading the LIB$INITIALIZE PSECT. */

#pragma extern_model save

int LIB$INITIALIZE( void);

#pragma extern_model strict_refdef
int dmy_lib$initialize = (int) LIB$INITIALIZE;

#pragma extern_model restore

#pragma standard

#else /* def USE_DECC_INIT */

/* Dummy code to avoid a %CC-W-EMPTYFILE complaint. */
int decc_init_dummy( void);

#endif /* def USE_DECC_INIT */
