/**************************************************************************** * libs/libc/stdio/lib_rawsostream.c * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you 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. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include "libc.h" /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: rawoutstream_putc ****************************************************************************/ static void rawoutstream_putc(FAR struct lib_outstream_s *this, int ch) { FAR struct lib_rawoutstream_s *rthis = (FAR struct lib_rawoutstream_s *)this; char buffer = ch; int nwritten; int errcode; DEBUGASSERT(this && rthis->fd >= 0); /* Loop until the character is successfully transferred or until an * irrecoverable error occurs. */ do { nwritten = _NX_WRITE(rthis->fd, &buffer, 1); if (nwritten == 1) { this->nput++; return; } /* The only expected error is EINTR, meaning that the write operation * was awakened by a signal. Zero or values > 1 would not be valid * return values from _NX_WRITE(). */ errcode = _NX_GETERRNO(nwritten); DEBUGASSERT(nwritten < 0); } while (errcode == EINTR); } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: lib_rawoutstream * * Description: * Initializes a stream for use with a file descriptor. * * Input Parameters: * outstream - User allocated, uninitialized instance of struct * lib_rawoutstream_s to be initialized. * fd - User provided file/socket descriptor (must have been opened * for write access). * * Returned Value: * None (User allocated instance initialized). * ****************************************************************************/ void lib_rawoutstream(FAR struct lib_rawoutstream_s *outstream, int fd) { outstream->public.put = rawoutstream_putc; outstream->public.flush = lib_noflush; outstream->public.nput = 0; outstream->fd = fd; }