/*-*- 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/runtime/runtime.h"
#include "libc/str/str.h"
#include "libc/sysv/errfuns.h"

static mbstate_t g_mbrtowc;

size_t mbrtowc(wchar_t *pwc, const char *src, size_t n, mbstate_t *ps) {
  /* TODO(jart): Need to fix. */
  wchar_t t;
  mbstate_t c;
  const unsigned char *p;
  if (!ps) ps = &g_mbrtowc;
  p = (const unsigned char *)src;
  c = *ps;
  if (!p && c) return eilseq();
  if (!p) return 0;
  if (!pwc) pwc = &t;
  if (n) {
    if (!c) {
      if (0 <= *p && *p < 0x80) {
        return !!(*pwc = *p);
      }
      abort(); /* TODO(jart) */
    }
  }
  return -2;
}