1 //===-- Implementation of strncpy -----------------------------------------===// 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/string/strncpy.h" 10 11 #include "src/__support/common.h" 12 #include <stddef.h> // For size_t. 13 14 namespace __llvm_libc { 15 16 LLVM_LIBC_FUNCTION(char *, strncpy, 17 (char *__restrict dest, const char *__restrict src, 18 size_t n)) { 19 size_t i = 0; 20 // Copy up until \0 is found. 21 for (; i < n && src[i] != '\0'; ++i) 22 dest[i] = src[i]; 23 // When n>strlen(src), n-strlen(src) \0 are appended. 24 for (; i < n; ++i) 25 dest[i] = '\0'; 26 return dest; 27 } 28 29 } // namespace __llvm_libc 30