eccodes/src/grib_accessor_class_getenv.c

/*
 * Copyright 2005-2015 ECMWF.
 *
 * This software is licensed under the terms of the Apache Licence Version 2.0
 * which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
 *
 * In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
 * virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
 */

#include "grib_api_internal.h"
/*
   This is used by make_class.pl

   START_CLASS_DEF
   CLASS      = accessor
   SUPER      = grib_accessor_class_ascii
   IMPLEMENTS = pack_string;unpack_string;value_count
   IMPLEMENTS = init;string_length
   MEMBERS= const char* name
   MEMBERS= char* value
   MEMBERS= const char* default_value
   END_CLASS_DEF

 */

/* START_CLASS_IMP */

/*

Don't edit anything between START_CLASS_IMP and END_CLASS_IMP
Instead edit values between START_CLASS_DEF and END_CLASS_DEF
or edit "accessor.class" and rerun ./make_class.pl

*/

static int pack_string(grib_accessor*, const char*, size_t *len);
static int unpack_string (grib_accessor*, char*, size_t *len);
static size_t string_length(grib_accessor*);
static int value_count(grib_accessor*,long*);
static void init(grib_accessor*,const long, grib_arguments* );
static void init_class(grib_accessor_class*);

typedef struct grib_accessor_getenv {
    grib_accessor          att;
/* Members defined in gen */
/* Members defined in ascii */
/* Members defined in getenv */
	const char* name;
	char* value;
	const char* default_value;
} grib_accessor_getenv;

extern grib_accessor_class* grib_accessor_class_ascii;

static grib_accessor_class _grib_accessor_class_getenv = {
    &grib_accessor_class_ascii,                      /* super                     */
    "getenv",                      /* name                      */
    sizeof(grib_accessor_getenv),  /* size                      */
    0,                           /* inited */
    &init_class,                 /* init_class */
    &init,                       /* init                      */
    0,                  /* post_init                      */
    0,                    /* free mem                       */
    0,                       /* describes himself         */
    0,                /* get length of section     */
    &string_length,              /* get length of string      */
    &value_count,                /* get number of values      */
    0,                 /* get number of bytes      */
    0,                /* get offset to bytes           */
    0,            /* get native type               */
    0,                /* get sub_section                */
    0,               /* grib_pack procedures long      */
    0,                 /* grib_pack procedures long      */
    0,                  /* grib_pack procedures long      */
    0,                /* grib_unpack procedures long    */
    0,                /* grib_pack procedures double    */
    0,              /* grib_unpack procedures double  */
    &pack_string,                /* grib_pack procedures string    */
    &unpack_string,              /* grib_unpack procedures string  */
    0,          /* grib_pack array procedures string    */
    0,        /* grib_unpack array procedures string  */
    0,                 /* grib_pack procedures bytes     */
    0,               /* grib_unpack procedures bytes   */
    0,            /* pack_expression */
    0,              /* notify_change   */
    0,                /* update_size   */
    0,            /* preferred_size   */
    0,                    /* resize   */
    0,      /* nearest_smaller_value */
    0,                       /* next accessor    */
    0,                    /* compare vs. another accessor   */
    0,     /* unpack only ith value          */
    0,     /* unpack a subarray         */
    0,              		/* clear          */
};


grib_accessor_class* grib_accessor_class_getenv = &_grib_accessor_class_getenv;


static void init_class(grib_accessor_class* c)
{
	c->dump	=	(*(c->super))->dump;
	c->next_offset	=	(*(c->super))->next_offset;
	c->byte_count	=	(*(c->super))->byte_count;
	c->byte_offset	=	(*(c->super))->byte_offset;
	c->get_native_type	=	(*(c->super))->get_native_type;
	c->sub_section	=	(*(c->super))->sub_section;
	c->pack_missing	=	(*(c->super))->pack_missing;
	c->is_missing	=	(*(c->super))->is_missing;
	c->pack_long	=	(*(c->super))->pack_long;
	c->unpack_long	=	(*(c->super))->unpack_long;
	c->pack_double	=	(*(c->super))->pack_double;
	c->unpack_double	=	(*(c->super))->unpack_double;
	c->pack_string_array	=	(*(c->super))->pack_string_array;
	c->unpack_string_array	=	(*(c->super))->unpack_string_array;
	c->pack_bytes	=	(*(c->super))->pack_bytes;
	c->unpack_bytes	=	(*(c->super))->unpack_bytes;
	c->pack_expression	=	(*(c->super))->pack_expression;
	c->notify_change	=	(*(c->super))->notify_change;
	c->update_size	=	(*(c->super))->update_size;
	c->preferred_size	=	(*(c->super))->preferred_size;
	c->resize	=	(*(c->super))->resize;
	c->nearest_smaller_value	=	(*(c->super))->nearest_smaller_value;
	c->next	=	(*(c->super))->next;
	c->compare	=	(*(c->super))->compare;
	c->unpack_double_element	=	(*(c->super))->unpack_double_element;
	c->unpack_double_subarray	=	(*(c->super))->unpack_double_subarray;
	c->clear	=	(*(c->super))->clear;
}

/* END_CLASS_IMP */

static void init(grib_accessor* a,const long l, grib_arguments* args)
{
    grib_accessor_getenv* self = (grib_accessor_getenv*)a;
    static char undefined[]="undefined";

    self->name=grib_arguments_get_string(a->parent->h,args,0);
    self->default_value=grib_arguments_get_string(a->parent->h,args,1);
    if (!self->default_value) self->default_value=undefined;
    self->value=0;
}

static int pack_string(grib_accessor* a, const char* val, size_t *len)
{
    return GRIB_NOT_IMPLEMENTED;
}

static int unpack_string(grib_accessor* a, char* val, size_t *len)
{
    grib_accessor_getenv* self = (grib_accessor_getenv*)a;
    char* v=0;
    size_t l=0;

    if (!self->value) {
        v=getenv(self->name);
        if (!v) v=(char*)self->default_value;
        self->value=v;
    }

    l=strlen(self->value);
    if (*len<l) return GRIB_ARRAY_TOO_SMALL;
    sprintf(val,"%s",self->value);
    *len=strlen(self->value);

    return GRIB_SUCCESS;
}

static int value_count(grib_accessor* a, long* count)
{
    *count = 1;
    return 0;
}

static size_t string_length(grib_accessor* a)
{
    return 1024;
}