/**************************************************************************** * libs/libc/stream/lib_stdsistream.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 "libc.h" /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: stdsistream_getc ****************************************************************************/ static int stdsistream_getc(FAR struct lib_sistream_s *this) { FAR struct lib_stdsistream_s *sthis = (FAR struct lib_stdsistream_s *)this; int ret; DEBUGASSERT(this); /* Get the next character from the incoming stream */ ret = getc(sthis->stream); if (ret != EOF) { this->nget++; } return ret; } /**************************************************************************** * Name: stdsistream_gets ****************************************************************************/ static int stdsistream_gets(FAR struct lib_instream_s *this, FAR void *buffer, int len) { FAR struct lib_stdsistream_s *sthis = (FAR struct lib_stdsistream_s *)this; int nread = 0; DEBUGASSERT(this); /* Get the buffer from the incoming stream */ nread = fread(buffer, len, 1, sthis->stream); if (nread >= 0) { this->nget += nread; } return nread; } /**************************************************************************** * Name: stdsistream_seek ****************************************************************************/ static off_t stdsistream_seek(FAR struct lib_sistream_s *this, off_t offset, int whence) { FAR struct lib_stdsistream_s *mthis = (FAR struct lib_stdsistream_s *)this; DEBUGASSERT(this); return fseek(mthis->stream, offset, whence); } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: lib_stdsistream * * Description: * Initializes a stream for use with a FILE instance. * * Input Parameters: * instream - User allocated, uninitialized instance of struct * lib_stdsistream_s to be initialized. * stream - User provided stream instance (must have been opened for * read access). * * Returned Value: * None (User allocated instance initialized). * ****************************************************************************/ void lib_stdsistream(FAR struct lib_stdsistream_s *instream, FAR FILE *stream) { instream->public.getc = stdsistream_getc; instream->public.gets = stdsistream_gets; instream->public.seek = stdsistream_seek; instream->public.nget = 0; instream->stream = stream; }