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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef _ADB_UTILS_H
#define _ADB_UTILS_H
/* bounded buffer functions */
/* all these functions are used to append data to a bounded buffer.
*
* after each operation, the buffer is guaranteed to be zero-terminated,
* even in the case of an overflow. they all return the new buffer position
* which allows one to use them in succession, only checking for overflows
* at the end. For example:
*
* BUFF_DECL(temp,p,end,1024);
* char* p;
*
* p = buff_addc(temp, end, '"');
* p = buff_adds(temp, end, string);
* p = buff_addc(temp, end, '"');
*
* if (p >= end) {
* overflow detected. note that 'temp' is
* zero-terminated for safety.
* }
* return strdup(temp);
*/
/* tries to add a character to the buffer, in case of overflow
* this will only write a terminating zero and return buffEnd.
*/
char* buff_addc (char* buff, char* buffEnd, int c);
/* tries to add a string to the buffer */
char* buff_adds (char* buff, char* buffEnd, const char* s);
/* tries to add a bytes to the buffer. the input can contain zero bytes,
* but a terminating zero will always be appended at the end anyway
*/
char* buff_addb (char* buff, char* buffEnd, const void* data, int len);
/* tries to add a formatted string to a bounded buffer */
char* buff_add (char* buff, char* buffEnd, const char* format, ... );
/* convenience macro used to define a bounded buffer, as well as
* a 'cursor' and 'end' variables all in one go.
*
* note: this doesn't place an initial terminating zero in the buffer,
* you need to use one of the buff_ functions for this. or simply
* do _cursor[0] = 0 manually.
*/
#define BUFF_DECL(_buff,_cursor,_end,_size) \
char _buff[_size], *_cursor=_buff, *_end = _cursor + (_size)
#endif /* _ADB_UTILS_H */
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