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https://github.com/jart/cosmopolitan.git
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0d748ad58e
This change fixes Cosmopolitan so it has fewer opinions about compiler warnings. The whole repository had to be cleaned up to be buildable in -Werror -Wall mode. This lets us benefit from things like strict const checking. Some actual bugs might have been caught too.
47 lines
2.5 KiB
C
47 lines
2.5 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/dce.h"
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#include "libc/intrin/getenv.internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Removes environment variable.
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*
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* @param s is non-empty environment key which can't contain `'='`
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* @return 0 on success, or -1 w/ errno and environment is unchanged
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* @raise EINVAL if `s` is an empty string or has a `'='` character
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*/
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int unsetenv(const char *s) {
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char **p;
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struct Env e;
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const char *t;
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if (!s || !*s) return einval();
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for (t = s; *t; ++t) {
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if (*t == '=') return einval();
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}
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if ((p = environ)) {
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e = __getenv(p, s);
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while (p[e.i]) {
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p[e.i] = p[e.i + 1];
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++e.i;
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}
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}
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return 0;
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}
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