mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-01 03:53:33 +00:00
e75ffde09e
You can now build Cosmopolitan with Clang:
make -j8 MODE=llvm
o/llvm/examples/hello.com
The assembler and linker code is now friendly to LLVM too.
So it's not needed to configure Clang to use binutils under
the hood. If you love LLVM then you can now use pure LLVM.
80 lines
3.7 KiB
C
80 lines
3.7 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/bits/bits.h"
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#include "libc/bits/pushpop.h"
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#include "libc/bits/safemacros.h"
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#include "libc/dce.h"
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#include "libc/dns/hoststxt.h"
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#include "libc/fmt/fmt.h"
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#include "libc/macros.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/stdio/stdio.h"
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#include "libc/str/str.h"
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static struct HostsTxt *g_hoststxt;
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static struct HostsTxtInitialStaticMemory {
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struct HostsTxt ht;
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struct HostsTxtEntry entries[8];
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char strings[64];
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} g_hoststxt_init;
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static textwindows noinline char *getnthoststxtpath(char *pathbuf,
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uint32_t size) {
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const char *const kWinHostsPath = "\\drivers\\etc\\hosts";
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uint32_t len = GetSystemDirectoryA(&pathbuf[0], size);
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if (len && len + strlen(kWinHostsPath) + 1 < size) {
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if (pathbuf[len] == '\\') pathbuf[len--] = '\0';
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memcpy(&pathbuf[len], kWinHostsPath, strlen(kWinHostsPath) + 1);
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return &pathbuf[0];
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} else {
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return NULL;
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}
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}
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/**
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* Returns parsed sorted singleton hardcoded hostname→ip4 map.
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*
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* @note yoinking realloc() ensures there's no size limits
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*/
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const struct HostsTxt *gethoststxt(void) {
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FILE *f;
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const char *path;
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char pathbuf[PATH_MAX];
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struct HostsTxtInitialStaticMemory *init;
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init = &g_hoststxt_init;
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if (!g_hoststxt) {
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g_hoststxt = &init->ht;
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init->ht.entries.n = pushpop(ARRAYLEN(init->entries));
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init->ht.entries.p = init->entries;
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init->ht.strings.n = pushpop(ARRAYLEN(init->strings));
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init->ht.strings.p = init->strings;
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__cxa_atexit(freehoststxt, &g_hoststxt, NULL);
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path = "/etc/hosts";
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if (IsWindows()) {
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path = firstnonnull(getnthoststxtpath(pathbuf, ARRAYLEN(pathbuf)), path);
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}
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if (!(f = fopen(path, "r")) || parsehoststxt(g_hoststxt, f) == -1) {
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/* TODO(jart): Elevate robustness. */
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}
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fclose(f);
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sorthoststxt(g_hoststxt);
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}
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return g_hoststxt;
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}
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