39 lines
2.4 KiB
C
39 lines
2.4 KiB
C
|
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
||
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
||
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
||
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
||
|
|
│ │
|
||
|
|
│ 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; version 2 of the License. │
|
||
|
|
│ │
|
||
|
|
│ 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., 51 Franklin Street, Fifth Floor, Boston, MA │
|
||
|
|
│ 02110-1301 USA │
|
||
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
||
|
|
#include "libc/bits/bits.h"
|
||
|
|
#include "libc/bits/safemacros.h"
|
||
|
|
#include "libc/runtime/runtime.h"
|
||
|
|
#include "libc/str/str.h"
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns value of environment variable, or NULL if not found.
|
||
|
|
*/
|
||
|
|
char *getenv(const char *name) {
|
||
|
|
char *empty[1] = {NULL};
|
||
|
|
char **ep = firstnonnull(environ, empty);
|
||
|
|
unsigned namelen = strlen(name);
|
||
|
|
for (int i = 0; ep[i]; ++i) {
|
||
|
|
if (strncmp(ep[i], name, namelen) == 0 && ep[i][namelen] == '=') {
|
||
|
|
return &ep[i][namelen + 1];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return NULL;
|
||
|
|
}
|