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/* setenv.c - setenv & unsetenv functions for systems missing it
* Copyright (C) 1999 Robert Bihlmeyer <robbe@orcus.priv.at>
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include "setenv.h"
#ifdef TESTING
#define setenv my_setenv
#define unsetenv my_unsetenv
#define TEST(F,E) do { printf("%s = %" #F "\n", #E, E); } while(0)
#define TEST0(E) do { printf("%s\n", #E); E; } while (0)
#endif
/* some systems do not declare this in their headers */
extern char **environ;
int setenv(const char *name, const char *value, int replace)
{
char *s;
size_t namelen;
if (!replace && getenv(name))
return 0;
namelen = strlen(name);
s = malloc(namelen + 1 + strlen(value) + 1);
if (!s)
return -1;
strcpy(s, name);
s[namelen] = '=';
strcpy(s + namelen + 1, value);
putenv(s);
return 0;
}
void unsetenv(const char *name)
{
char **v;
size_t len;
len = strlen(name);
for (v = environ; v[0] != NULL; v++)
if (strncmp(v[0], name, len) == 0 && v[0][len] == '=')
break;
while (v[0]) {
v[0] = v[1];
v++;
}
}
#ifdef TESTING
#include <stdio.h>
int main()
{
TEST(d,setenv("xxx", "foo", 1));
TEST(s,getenv("xxx"));
TEST(d,setenv("xxx", "bar", 0));
TEST(s,getenv("xxx"));
TEST(d,setenv("xxx", "baz", 1));
TEST(s,getenv("xxx"));
TEST0(unsetenv("xxx"));
TEST(s,getenv("xxx"));
return 0;
}
#endif
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