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/*************************************************
* Exim - an Internet mail transport agent *
*************************************************/
/* Copyright (c) Michael Haardt 2015
* Copyright (c) Jeremy Harris 2015 - 2016
* Copyright (c) The Exim Maintainers 2016 */
/* See the file NOTICE for conditions of use and distribution. */
/* This module provides (un)setenv routines for those environments
lacking them in libraries. It is #include'd by OS/os.c-foo files. */
int
setenv(const char * name, const char * val, int overwrite)
{
uschar * s;
if (Ustrchr(name, '=')) return -1;
if (overwrite || !getenv(name))
putenv(CS string_copy_perm(string_sprintf("%s=%s", name, val), FALSE));
return 0;
}
int
unsetenv(const char *name)
{
size_t len;
const char * end;
extern char ** environ;
if (!name)
{
errno = EINVAL;
return -1;
}
if (!environ)
return 0;
for (end = name; *end != '=' && *end; ) end++;
len = end - name;
/* Find name in environment and move remaining variables down.
Do not early-out in case there are duplicate names. */
for (char ** e = environ; *e; e++)
if (strncmp(*e, name, len) == 0 && (*e)[len] == '=')
{
char ** sp = e;
do *sp = sp[1]; while (*++sp);
}
return 0;
}
/* vi: aw ai sw=2
*/
/* End of setenv.c */
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