An implementation of Unix dc and POSIX bc with GNU and BSD extensions. Finished, but well-maintained.
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/*
* *****************************************************************************
*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2018-2021 Gavin D. Howard and contributors.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* *****************************************************************************
*
* Code to handle special I/O for bc.
*
*/
#ifndef BC_READ_H
#define BC_READ_H
#include <stdlib.h>
#include <status.h>
#include <vector.h>
/**
* Returns true if @a c is a non-ASCII (invalid) char.
* @param c The character to test.
* @return True if @a c is an invalid char.
*/
#define BC_READ_BIN_CHAR(c) (!(c))
/**
* Reads a line from stdin after printing prompt, if desired.
* @param vec The vector to put the stdin data into.
* @param prompt The prompt to print, if desired.
*/
BcStatus
bc_read_line(BcVec* vec, const char* prompt);
/**
* Read a file and return a buffer with the data. The buffer must be freed by
* the caller.
* @param path The path to the file to read.
*/
char*
bc_read_file(const char* path);
/**
* Helper function for reading characters from stdin. This takes care of a bunch
* of complex error handling. Thus, it returns a status instead of throwing an
* error, except for fatal errors.
* @param vec The vec to put the stdin into.
* @param prompt The prompt to print, if desired.
*/
BcStatus
bc_read_chars(BcVec* vec, const char* prompt);
/**
* Read a line from buf into vec.
* @param vec The vector to read data into.
* @param buf The buffer to read from.
* @param buf_len The length of the buffer.
*/
bool
bc_read_buf(BcVec* vec, char* buf, size_t* buf_len);
#endif // BC_READ_H