mirror of
https://github.com/jart/cosmopolitan.git
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103 lines
3.5 KiB
C
103 lines
3.5 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/intrin/getenv.internal.h"
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#include "libc/intrin/kmalloc.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/macros.internal.h"
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#include "libc/mem/internal.h"
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#include "libc/runtime/runtime.h"
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#define ToUpper(c) ((c) >= 'a' && (c) <= 'z' ? (c) - 'a' + 'A' : (c))
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static char **expected;
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static size_t capacity;
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static size_t GetEnvironLen(char **env) {
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char **p = env;
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while (*p) ++p;
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return p - env;
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}
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static char **GrowEnviron(char **a) {
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size_t n, c;
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char **b, **p;
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if (!a) a = environ;
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n = a ? GetEnvironLen(a) : 0;
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c = MAX(16ul, n) << 1;
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if ((b = kmalloc(c * sizeof(char *)))) {
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if (a) {
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for (p = b; *a;) {
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*p++ = *a++;
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}
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}
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environ = b;
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expected = b;
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capacity = c;
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return b;
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} else {
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return 0;
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}
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}
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int PutEnvImpl(char *s, bool overwrite) {
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char **p;
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struct Env e;
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if (!(p = environ)) {
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if (!(p = GrowEnviron(0))) {
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return -1;
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}
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}
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e = __getenv(p, s);
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if (e.s && !overwrite) {
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return 0;
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}
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if (e.s) {
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p[e.i] = s;
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return 0;
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}
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if (p != expected) {
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capacity = e.i;
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}
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if (e.i + 1 >= capacity) {
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if (!(p = GrowEnviron(p))) {
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return -1;
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}
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}
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p[e.i + 1] = 0;
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p[e.i] = s;
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return 0;
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}
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/**
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* Emplaces environment key=value.
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*
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* @param s should be a string that looks like `"name=value"` and it'll
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* become part of the environment; changes to its memory will change
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* the environment too
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* @return 0 on success, or non-zero w/ errno on error
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* @raise ENOMEM if we require more vespene gas
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* @see setenv(), getenv()
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* @threadunsafe
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*/
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int putenv(char *s) {
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int rc;
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rc = PutEnvImpl(s, true);
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STRACE("putenv(%#s) → %d% m", s, rc);
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return rc;
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}
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