1 /* 2 * Copyright 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ANDROID_AUDIO_STRING_H 18 #define ANDROID_AUDIO_STRING_H 19 20 #include <string.h> 21 22 /** similar to strlcpy but also zero fills to end of string buffer, ensures no data leak 23 in parceled data sent over binder.*/ 24 inline size_t audio_utils_strlcpy_zerofill(char *dst, const char *src, size_t dst_size) { 25 const size_t srclen = strlcpy(dst, src, dst_size); 26 const size_t srclen_with_zero = srclen + 1; /* include zero termination in length. */ 27 if (srclen_with_zero < dst_size) { 28 const size_t num_zeroes = dst_size - srclen_with_zero; 29 memset(dst + srclen_with_zero, 0 /* value */, num_zeroes); /* clear remaining buffer */ 30 } 31 return srclen; 32 } 33 34 #ifdef __cplusplus 35 36 /** similar to audio_utils_strlcpy_zerofill for fixed size destination string. */ 37 template <size_t size> 38 inline size_t audio_utils_strlcpy_zerofill(char (&dst)[size], const char *src) { 39 return audio_utils_strlcpy_zerofill(dst, src, size); 40 } 41 42 /** similar to strlcpy for fixed size destination string. */ 43 template <size_t size> 44 inline size_t audio_utils_strlcpy(char (&dst)[size], const char *src) { 45 return strlcpy(dst, src, size); 46 } 47 48 #endif // __cplusplus 49 50 #endif // !ANDROID_AUDIO_STRING_H 51
