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/* -*-comment-start: "//";comment-end:""-*-
* GNU Mes --- Maxwell Equations of Software
* Copyright © 2016,2017,2018,2019,2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
*
* This file is part of GNU Mes.
*
* GNU Mes is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or (at
* your option) any later version.
*
* GNU Mes is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
*/
#include <mes/lib.h>
#include <string.h>
#include <stdlib.h>
// CONSTANT M2_PTR_SIZE 4
#define M2_PTR_SIZE 1
int
setenv (char const *s, char const *v, int overwrite_p)
{
char **p = environ;
int length = strlen (s);
char* q;
while (p[0] != 0)
{
if (strncmp (s, p[0], length) == 0)
{
q = p[0] + length;
if (q[0] == '=')
break;
}
p = p + M2_PTR_SIZE;
}
char *entry = malloc (length + strlen (v) + 2);
int end_p = p[0] == 0;
p[0] = entry;
strcpy (entry, s);
strcpy (entry + length, "=");
strcpy (entry + length + 1, v);
entry[length + strlen (v) + 2] = 0;
if (end_p != 0)
p[1] = 0;
return 0;
}
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