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