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Diffstat (limited to 'nuttx/lib/stdio/lib_memoutstream.c')
-rw-r--r-- | nuttx/lib/stdio/lib_memoutstream.c | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/nuttx/lib/stdio/lib_memoutstream.c b/nuttx/lib/stdio/lib_memoutstream.c new file mode 100644 index 000000000..007ab8976 --- /dev/null +++ b/nuttx/lib/stdio/lib_memoutstream.c @@ -0,0 +1,101 @@ +/**************************************************************************** + * lib/stdio/lib_memoutstream.c + * + * Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. 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. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * 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 OWNER 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. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include "lib_internal.h" + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: memoutstream_putc + ****************************************************************************/ + +static void memoutstream_putc(FAR struct lib_outstream_s *this, int ch) +{ + FAR struct lib_memoutstream_s *mthis = (FAR struct lib_memoutstream_s *)this; + + /* If this will not overrun the buffer, then write the character to the + * buffer. Not that buflen was pre-decremented when the stream was + * created so it is okay to write past the end of the buflen by one. + */ + + if (this && this->nput < mthis->buflen) + { + mthis->buffer[this->nput] = ch; + this->nput++; + mthis->buffer[this->nput] = '\0'; + } +} + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: lib_memoutstream + * + * Description: + * Initializes a stream for use with a fixed-size memory buffer. + * + * Input parameters: + * memoutstream - User allocated, uninitialized instance of struct + * lib_memoutstream_s to be initialized. + * bufstart - Address of the beginning of the fixed-size memory buffer + * buflen - Size of the fixed-sized memory buffer in bytes + * + * Returned Value: + * None (memoutstream initialized). + * + ****************************************************************************/ + +void lib_memoutstream(FAR struct lib_memoutstream_s *memoutstream, + FAR char *bufstart, int buflen) +{ + memoutstream->public.put = memoutstream_putc; +#ifdef CONFIG_STDIO_LINEBUFFER + memoutstream->public.flush = lib_noflush; +#endif + memoutstream->public.nput = 0; /* Will be buffer index */ + memoutstream->buffer = bufstart; /* Start of buffer */ + memoutstream->buflen = buflen - 1; /* Save space for null terminator */ + memoutstream->buffer[0] = '\0'; /* Start with an empty string */ +} + + |