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https://github.com/jart/cosmopolitan.git
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1eb6484c9c
This change addresses a bug that was reported in #923 where bash on Windows behaved strangely. It turned out that our weak linking of malloc() caused bash's configure script to favor its own getcwd() function, which is implemented in the most astonishing way, using opendir() and readdir() to recursively construct the current path. This change moves getcwd() into LIBC_STDIO so it can strongly link malloc(). A new __getcwd() function is now introduced, so all the low-level runtime services can still use the actual system call. It provides the Linux Kernel API convention across platforms, and is overall a higher-quality implementation than what we had before. In the future, we should probably take a closer look into why bash's getcwd() polyfill wasn't working as intended on Windows, since there might be a potential opportunity there to improve our readdir() too.
101 lines
3.9 KiB
C
101 lines
3.9 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 2022 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/atomic.h"
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#include "libc/calls/calls.h"
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#include "libc/cosmo.h"
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#include "libc/dce.h"
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#include "libc/limits.h"
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#include "libc/macros.internal.h"
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#include "libc/nt/systeminfo.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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static struct {
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atomic_uint once;
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union {
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char path[PATH_MAX];
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char16_t path16[PATH_MAX / 2];
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};
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} __tmpdir;
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static inline int IsAlpha(int c) {
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return ('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z');
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}
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static void __tmpdir_init(void) {
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int i;
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char *s;
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uint32_t n;
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if ((s = getenv("TMPDIR"))) {
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if (*s != '/') {
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if (__getcwd(__tmpdir.path, PATH_MAX) == -1) {
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goto GiveUp;
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}
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strlcat(__tmpdir.path, "/", sizeof(__tmpdir.path));
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}
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strlcat(__tmpdir.path, s, sizeof(__tmpdir.path));
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if (strlcat(__tmpdir.path, "/", sizeof(__tmpdir.path)) <
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PATH_MAX - NAME_MAX) {
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return;
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}
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}
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GiveUp:
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if (IsWindows() &&
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((n = GetTempPath(ARRAYLEN(__tmpdir.path16), __tmpdir.path16)) &&
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n < ARRAYLEN(__tmpdir.path16))) {
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// turn c:\foo\bar\ into c:/foo/bar/
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for (i = 0; i < n; ++i) {
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if (__tmpdir.path16[i] == '\\') {
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__tmpdir.path16[i] = '/';
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}
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}
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// turn c:/... into /c/...
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if (IsAlpha(__tmpdir.path16[0]) && __tmpdir.path16[1] == ':' &&
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__tmpdir.path16[2] == '/') {
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__tmpdir.path16[1] = __tmpdir.path16[0];
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__tmpdir.path16[0] = '/';
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__tmpdir.path16[2] = '/';
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}
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tprecode16to8(__tmpdir.path, sizeof(__tmpdir.path), __tmpdir.path16);
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return;
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}
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strcpy(__tmpdir.path, "/tmp/");
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}
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/**
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* Returns pretty good temporary directory.
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*
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* The order of precedence is:
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*
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* - $TMPDIR/ is always favored if defined
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* - GetTempPath(), for the New Technology
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* - /tmp/ to make security scene go crazy
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*
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* This guarantees an absolute path with a trailing slash. The returned
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* value points to static memory with `PATH_MAX` bytes. The string will
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* be short enough that at least `NAME_MAX` bytes remain. This function
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* is thread safe so long as callers don't modified the returned memory
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*/
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char *__get_tmpdir(void) {
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cosmo_once(&__tmpdir.once, __tmpdir_init);
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return __tmpdir.path;
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}
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