mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
33e8fc8687
You can now do epic things like this:
puts(_gc(xasprintf("%d", 123)));
The _gc() API is shorthand for _defer() which works like Go's keyword:
const char *s = xasprintf("%d", 123);
_defer(free, s);
puts(s);
Be sure to always use -fno-omit-frame-pointer which makes code fast too.
Enjoy! See also #114
74 lines
3.6 KiB
C
74 lines
3.6 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/pushpop.h"
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#include "libc/nt/enum/version.h"
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#include "libc/nt/runtime.h"
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#include "libc/runtime/internal.h"
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#include "libc/sysv/consts/fileno.h"
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#include "libc/sysv/consts/nr.h"
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#define STACK_SMASH_MESSAGE "stack smashed\n"
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/**
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* Aborts program under enemy fire to avoid being taken alive.
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*/
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privileged noasan void __stack_chk_fail(void) {
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size_t len;
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const char *msg;
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int64_t ax, cx, si;
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if (!IsWindows()) {
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msg = STACK_SMASH_MESSAGE;
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len = pushpop(sizeof(STACK_SMASH_MESSAGE) - 1);
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if (!IsMetal()) {
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asm volatile("syscall"
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: "=a"(ax)
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: "0"(__NR_write), "D"(pushpop(STDERR_FILENO)), "S"(msg),
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"d"(len)
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: "rcx", "r11", "cc", "memory");
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asm volatile("syscall"
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: "=a"(ax)
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: "0"(__NR_exit_group), "D"(pushpop(23))
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: "rcx", "r11", "cc", "memory");
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}
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asm volatile("rep outsb"
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: "=S"(si), "=c"(cx)
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: "0"(msg), "1"(len), "d"(0x3F8 /* COM1 */)
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: "memory");
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asm("push\t$0\n\t"
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"push\t$0\n\t"
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"cli\n\t"
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"lidt\t(%rsp)");
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for (;;) asm("ud2");
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}
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if (NtGetVersion() < kNtVersionFuture) {
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do {
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asm volatile("syscall"
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: "=a"(ax), "=c"(cx)
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: "0"(NtGetVersion() < kNtVersionWindows8 ? 0x0029
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: NtGetVersion() < kNtVersionWindows81 ? 0x002a
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: NtGetVersion() < kNtVersionWindows10 ? 0x002b
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: 0x002c),
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"1"(pushpop(-1L)), "d"(42)
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: "r11", "cc", "memory");
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} while (!ax);
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}
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for (;;) {
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TerminateProcess(GetCurrentProcess(), 42);
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}
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}
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