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