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 "src/__support/macros/config.h" 13 #include <stddef.h> // For size_t. 14 15 namespace LIBC_NAMESPACE_DECL { 16 17 LLVM_LIBC_FUNCTION(char *, strncpy, 18 (char *__restrict dest, const char *__restrict src, 19 size_t n)) { 20 size_t i = 0; 21 // Copy up until \0 is found. 22 for (; i < n && src[i] != '\0'; ++i) 23 dest[i] = src[i]; 24 // When n>strlen(src), n-strlen(src) \0 are appended. 25 for (; i < n; ++i) 26 dest[i] = '\0'; 27 return dest; 28 } 29 30 } // namespace LIBC_NAMESPACE_DECL 31