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/**
* @file getenv.c
* @author Ambroz Bizjak <ambrop7@gmail.com>
*
* @section LICENSE
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* @section DESCRIPTION
*
* Synopsis:
* getenv(string name)
*
* Variables:
* string (empty) - if the environment value exists, its value
* string exists - "true" if the variable exists, "false" if not
*/
#include <stdlib.h>
#include <misc/strdup.h>
#include <ncd/module_common.h>
#include <generated/blog_channel_ncd_getenv.h>
struct instance {
NCDModuleInst *i;
char *value;
};
enum {STRING_EXISTS};
static const char *strings[] = {"exists", NULL};
static void func_new (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
{
struct instance *o = vo;
o->i = i;
// check arguments
NCDValRef name_arg;
if (!NCDVal_ListRead(params->args, 1, &name_arg)) {
ModuleLog(i, BLOG_ERROR, "wrong arity");
goto fail0;
}
if (!NCDVal_IsString(name_arg)) {
ModuleLog(i, BLOG_ERROR, "wrong type");
goto fail0;
}
o->value = NULL;
if (NCDVal_StringHasNulls(name_arg)) {
goto out;
}
NCDValNullTermString nts;
if (!NCDVal_StringNullTerminate(name_arg, &nts)) {
ModuleLog(i, BLOG_ERROR, "NCDVal_StringNullTerminate failed");
goto fail0;
}
char *result = getenv(nts.data);
NCDValNullTermString_Free(&nts);
if (!result) {
goto out;
}
o->value = b_strdup(result);
if (!o->value) {
ModuleLog(i, BLOG_ERROR, "b_strdup failed");
goto fail0;
}
out:
// signal up
NCDModuleInst_Backend_Up(i);
return;
fail0:
NCDModuleInst_Backend_DeadError(i);
}
static void func_die (void *vo)
{
struct instance *o = vo;
// free value
if (o->value) {
BFree(o->value);
}
NCDModuleInst_Backend_Dead(o->i);
}
static int func_getvar (void *vo, NCD_string_id_t name, NCDValMem *mem, NCDValRef *out)
{
struct instance *o = vo;
if (name == NCD_STRING_EMPTY && o->value) {
*out = NCDVal_NewString(mem, o->value);
return 1;
}
if (name == ModuleString(o->i, STRING_EXISTS)) {
*out = ncd_make_boolean(mem, !!o->value);
return 1;
}
return 0;
}
static struct NCDModule modules[] = {
{
.type = "getenv",
.func_new2 = func_new,
.func_die = func_die,
.func_getvar2 = func_getvar,
.alloc_size = sizeof(struct instance)
}, {
.type = NULL
}
};
const struct NCDModuleGroup ncdmodule_getenv = {
.modules = modules,
.strings = strings
};
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