160cef893SCheng Wang //===-- Implementation of strncpy -----------------------------------------===// 260cef893SCheng Wang // 360cef893SCheng Wang // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 460cef893SCheng Wang // See https://llvm.org/LICENSE.txt for license information. 560cef893SCheng Wang // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 660cef893SCheng Wang // 760cef893SCheng Wang //===----------------------------------------------------------------------===// 860cef893SCheng Wang 960cef893SCheng Wang #include "src/string/strncpy.h" 1060cef893SCheng Wang 1160cef893SCheng Wang #include "src/__support/common.h" 1260cef893SCheng Wang #include <stddef.h> // For size_t. 1360cef893SCheng Wang 1460cef893SCheng Wang namespace __llvm_libc { 1560cef893SCheng Wang 16*a0b65a7bSMichael Jones LLVM_LIBC_FUNCTION(char *, strncpy, 17*a0b65a7bSMichael Jones (char *__restrict dest, const char *__restrict src, 18*a0b65a7bSMichael Jones size_t n)) { 1960cef893SCheng Wang size_t i = 0; 2060cef893SCheng Wang // Copy up until \0 is found. 2160cef893SCheng Wang for (; i < n && src[i] != '\0'; ++i) 2260cef893SCheng Wang dest[i] = src[i]; 2360cef893SCheng Wang // When n>strlen(src), n-strlen(src) \0 are appended. 2460cef893SCheng Wang for (; i < n; ++i) 2560cef893SCheng Wang dest[i] = '\0'; 2660cef893SCheng Wang return dest; 2760cef893SCheng Wang } 2860cef893SCheng Wang 2960cef893SCheng Wang } // namespace __llvm_libc 30