Initial import

libc/log/checkfail_ndebug.c

@@ -0,0 +1,42 @@
+/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
+│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
+╞══════════════════════════════════════════════════════════════════════════════╡
+│ Copyright 2020 Justine Alexandra Roberts Tunney                              │
+│                                                                              │
+│ This program is free software; you can redistribute it and/or modify         │
+│ it under the terms of the GNU General Public License as published by         │
+│ the Free Software Foundation; version 2 of the License.                      │
+│                                                                              │
+│ This program is distributed in the hope that it will be useful, but          │
+│ WITHOUT ANY WARRANTY; without even the implied warranty of                   │
+│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU             │
+│ General Public License for more details.                                     │
+│                                                                              │
+│ You should have received a copy of the GNU General Public License            │
+│ along with this program; if not, write to the Free Software                  │
+│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA                │
+│ 02110-1301 USA                                                               │
+╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/errno.h"
+#include "libc/fmt/fmt.h"
+#include "libc/log/internal.h"
+#include "libc/log/log.h"
+#include "libc/stdio/stdio.h"
+
+/**
+ * Handles failure of CHECK_xx() macros in -DNDEBUG mode.
+ *
+ * This handler (1) makes binaries smaller by not embedding source code;
+ * and therefore (2) less likely to leak sensitive information. This can
+ * still print backtraces with function names if the .com.dbg file is in
+ * the same folder.
+ *
+ * @see libc/log/thunks/__check_fail_ndebug.S
+ */
+relegated void ___check_fail_ndebug(uint64_t want, uint64_t got,
+                                    const char *opchar) {
+  int lasterr = errno;
+  startfatal_ndebug();
+  fprintf(stderr, "%s: %#lx %s %#lx (%s)\n", "check failed", want, opchar, got,
+          strerror(lasterr));
+}