/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│ │ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │ ╞══════════════════════════════════════════════════════════════════════════════╡ │ Copyright 2020 Justine Alexandra Roberts Tunney │ │ │ │ Permission to use, copy, modify, and/or distribute this software for │ │ any purpose with or without fee is hereby granted, provided that the │ │ above copyright notice and this permission notice appear in all copies. │ │ │ │ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │ │ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │ │ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │ │ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │ │ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │ │ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │ │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │ │ PERFORMANCE OF THIS SOFTWARE. │ ╚─────────────────────────────────────────────────────────────────────────────*/ #include "libc/fmt/conv.h" /** * Returns absolute value of 𝑥. * * This function is a footgun since your argument may be narrrowed. * Consider using labs(), llabs(), or better yet a macro like this: * * #define ABS(X) ((X) >= 0 ? (X) : -(X)) * * Note that passing `x` as `INT_MIN` is undefined behavior, which * depends on whether or not your c library as well as the objects * that call it were built using the `-fwrapv` or `-ftrapv` flags. */ int abs(int x) { return x < 0 ? -x : x; } /** * Returns absolute value of 𝑥. */ long labs(long x) { return x < 0 ? -x : x; } __weak_reference(labs, llabs); __weak_reference(labs, imaxabs);