mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-07 23:13:34 +00:00
af645fcbec
- Add Lua backtraces to redbean! - Wipe serving keys after redbean forks - Audit redbean to remove free via exit - Log SSL client ciphersuite preferences - Increase ASAN malloc() backtrace depth - Make GetSslRoots() behave as a singleton - Move leaks.c from LIBC_TESTLIB to LIBC_LOG - Add undocumented %n to printf() for newlines - Fix redbean memory leak reindexing inode change - Fix redbean memory leak with Fetch() DNS object - Restore original environ after __cxa_finalize() - Make backtrace always work after __cxa_finalize() - Introduce COUNTEXPR() diagnostic / benchmark tool - Fix a few more instances of errno being clobbered - Consolidate the ANSI color disabling internal APIs
126 lines
3.8 KiB
C
126 lines
3.8 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/alg/alg.h"
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#include "libc/calls/sysdebug.internal.h"
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#include "libc/dce.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/mem/mem.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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#include "libc/sysv/errfuns.h"
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#define ToUpper(c) ((c) >= 'a' && (c) <= 'z' ? (c) - 'a' + 'A' : (c))
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static bool once;
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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 void RestoreOriginalEnvironment(char **envp) {
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environ = envp;
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}
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static void PutEnvImplAtExit(void *p) {
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free(p);
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}
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static void FreeEnviron(char **env) {
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char **a;
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for (a = env; *a; ++a) {
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free(*a);
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}
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free(env);
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}
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static void GrowEnviron(void) {
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size_t n, c;
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char **a, **b, **p;
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a = environ;
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n = GetEnvironLen(a);
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c = MAX(16ul, n) << 1;
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b = calloc(c, sizeof(char *));
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for (p = b; *a;) {
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*p++ = strdup(*a++);
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}
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__cxa_atexit(FreeEnviron, b, 0);
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environ = b;
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capacity = c;
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}
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int PutEnvImpl(char *s, bool overwrite) {
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char *p;
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unsigned i, namelen;
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if (!once) {
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__cxa_atexit(RestoreOriginalEnvironment, environ, 0);
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GrowEnviron();
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once = true;
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}
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for (p = s; *p && *p != '='; ++p) {
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if (IsWindows()) {
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*p = ToUpper(*p);
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}
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}
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if (*p != '=') goto Fail;
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namelen = p + 1 - s;
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for (i = 0; environ[i]; ++i) {
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if (!strncmp(environ[i], s, namelen)) {
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if (!overwrite) {
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free(s);
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return 0;
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}
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goto Replace;
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}
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}
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if (i + 1 >= capacity) {
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GrowEnviron();
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}
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environ[i + 1] = 0;
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Replace:
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__cxa_atexit(PutEnvImplAtExit, environ[i], 0);
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environ[i] = s;
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return 0;
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Fail:
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free(s);
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return einval();
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}
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/* weakly called by unsetenv() when removing a pointer */
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void __freeenv(void *p) {
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if (once) {
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__cxa_atexit(free, p, 0);
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}
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}
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/**
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* Emplaces environment key=value.
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*
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* @return 0 on success or non-zero on error
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* @see setenv(), getenv()
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*/
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int putenv(char *s) {
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int rc;
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rc = PutEnvImpl(strdup(s), true);
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SYSDEBUG("putenv(%#s) → %d", s, rc);
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return rc;
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}
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