cosmopolitan/libc/str/strncmp8to16.c

/*-*- 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/assert.h"
#include "libc/str/internal.h"
#include "libc/str/strcmp8to16i.internal.h"

forceinline unsigned identity32u(unsigned x) {
  return x;
}

/**
 * Compares UTF-8 and UTF-16 strings, with limit.
 */
int strncmp8to16(const char *s1, const char16_t *s2, size_t n) {
  assert(n != -1ul);
  return strcmp8to16i(s1, s2, n, identity32u);
}

int strncmp16to8(const char16_t *s1, const char *s2, size_t n) {
  return -strncmp8to16(s2, s1, n);
}