mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
44 lines
2.4 KiB
C
44 lines
2.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ 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. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/intrin/getenv.h"
|
|
#include "libc/intrin/strace.h"
|
|
#include "libc/runtime/runtime.h"
|
|
|
|
/**
|
|
* Returns value of environment variable, or NULL if not found.
|
|
*
|
|
* Environment variables can store empty string on Unix but not Windows.
|
|
*
|
|
* @return pointer to value of `environ` entry, or null if not found
|
|
* @threadunsafe
|
|
*/
|
|
char *getenv(const char *s) {
|
|
char **p;
|
|
struct Env e;
|
|
if (!(p = environ))
|
|
return 0;
|
|
e = __getenv(p, s);
|
|
#if SYSDEBUG
|
|
// if (!(s[0] == 'T' && s[1] == 'Z' && !s[2])) {
|
|
// TODO(jart): memoize TZ or something
|
|
STRACE("getenv(%#s) → %#s", s, e.s);
|
|
//}
|
|
#endif
|
|
return e.s;
|
|
}
|