mirror of
https://github.com/jart/cosmopolitan.git
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54 lines
2.8 KiB
C
54 lines
2.8 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/assert.h"
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#include "libc/bits/weaken.h"
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#include "libc/calls/calls.h"
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#include "libc/log/log.h"
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#include "libc/macros.h"
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#include "libc/mem/alloca.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/consts/fileno.h"
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/**
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* Handles failure of assert() macro.
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*/
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relegated void __assert_fail(const char *expr, const char *file, int line) {
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static bool once;
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char *msg, *p, linebuf[16];
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unsigned i, exprlen, filelen;
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if (!once) {
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once = true;
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exprlen = expr ? strlen(expr) : 0;
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filelen = file ? strlen(file) : 0;
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p = msg = alloca(MIN(512, exprlen + filelen + 64));
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p = mempcpy(p, file, filelen);
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p = stpcpy(p, ":");
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if (line < 1) line = 1;
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for (i = 0; line; line /= 10) linebuf[i++] = '0' + line % 10;
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while (i) *p++ = linebuf[--i];
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p = stpcpy(p, ":");
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p = mempcpy(p, expr, exprlen);
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p = stpcpy(p, "\r\n");
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write(STDERR_FILENO, msg, p - msg);
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if (weaken(__die)) weaken(__die)();
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}
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abort();
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unreachable;
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}
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