1 //===-- Implementation of stpncpy -----------------------------------------===// 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/stpncpy.h" 10 #include "src/__support/macros/config.h" 11 #include "src/string/memory_utils/inline_bzero.h" 12 13 #include "src/__support/common.h" 14 15 namespace LIBC_NAMESPACE_DECL { 16 17 LLVM_LIBC_FUNCTION(char *, stpncpy, 18 (char *__restrict dest, const char *__restrict src, 19 size_t n)) { 20 size_t i; 21 // Copy up until \0 is found. 22 for (i = 0; i < n && src[i] != '\0'; ++i) 23 dest[i] = src[i]; 24 // When n>strlen(src), n-strlen(src) \0 are appended. 25 if (n > i) 26 inline_bzero(dest + i, n - i); 27 return dest + i; 28 } 29 30 } // namespace LIBC_NAMESPACE_DECL 31