1 //===-- Implementation of swab --------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "src/unistd/swab.h" 10 11 #include "src/__support/common.h" 12 #include "src/__support/macros/config.h" 13 14 namespace LIBC_NAMESPACE_DECL { 15 16 LLVM_LIBC_FUNCTION(void, swab, 17 (const void *__restrict from, void *__restrict to, 18 ssize_t n)) { 19 const unsigned char *f = static_cast<const unsigned char *>(from); 20 unsigned char *t = static_cast<unsigned char *>(to); 21 for (ssize_t i = 1; i < n; i += 2) { 22 t[i - 1] = f[i]; 23 t[i] = f[i - 1]; 24 } 25 } 26 27 } // namespace LIBC_NAMESPACE_DECL 28