ifupdown-ng/libifupdown/environment.c

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/*
* libifupdown/environment.c
* Purpose: environment variable management
*
* Copyright (c) 2020 Ariadne Conill <ariadne@dereferenced.org>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* This software is provided 'as is' and without any warranty, express or
* implied. In no event shall the authors be liable for any damages arising
* from the use of this software.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "libifupdown/environment.h"
bool
lif_environment_push(char **env[], const char *name, const char *val)
{
char buf[4096];
snprintf(buf, sizeof buf, "%s=%s", name, val);
/* create an initial envp: {"foo=bar", NULL} */
if (*env == NULL)
{
*env = calloc(2, sizeof (char *));
(*env)[0] = strdup(buf);
(*env)[1] = NULL;
return true;
}
size_t nelems;
for (nelems = 0; (*env)[nelems] != NULL; nelems++)
;
/* NULL at end, plus next env var */
size_t allocelems = nelems + 2;
*env = realloc(*env, ((allocelems + 2) * sizeof (char *)));
(*env)[nelems] = strdup(buf);
(*env)[nelems + 1] = NULL;
return true;
}
void
lif_environment_free(char **env[])
{
size_t nelems;
for (nelems = 0; (*env)[nelems] != NULL; nelems++)
free((*env)[nelems]);
free(*env);
}