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