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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2007-02-17 23:21:28 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2007-02-17 23:21:28 +0000 |
commit | e3940eb2080711edac189cca3f642ee89dc215f2 (patch) | |
tree | 1c390958fae49e34dce698b175487e6d4681e540 /nuttx/lib/lib_fflush.c | |
parent | 2223612deb2cc6322992f8595b6d6f86fcb53ae1 (diff) | |
download | px4-nuttx-e3940eb2080711edac189cca3f642ee89dc215f2.tar.gz px4-nuttx-e3940eb2080711edac189cca3f642ee89dc215f2.tar.bz2 px4-nuttx-e3940eb2080711edac189cca3f642ee89dc215f2.zip |
NuttX RTOS
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/lib/lib_fflush.c')
-rw-r--r-- | nuttx/lib/lib_fflush.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/nuttx/lib/lib_fflush.c b/nuttx/lib/lib_fflush.c new file mode 100644 index 000000000..b3dbb1109 --- /dev/null +++ b/nuttx/lib/lib_fflush.c @@ -0,0 +1,171 @@ +/************************************************************ + * lib_fflush.c + * + * Copyright (C) 2007 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * 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 Gregory Nutt 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. + * + ************************************************************/ + +/************************************************************ + * Compilation Switches + ************************************************************/ + +/************************************************************ + * Included Files + ************************************************************/ + +#include <nuttx/config.h> /* for CONFIG_STDIO_BUFFER_SIZE */ + +#if CONFIG_NFILE_STREAMS > 0 + +#include <stdio.h> +#include <errno.h> +#include <nuttx/fs.h> +#include "lib_internal.h" + +/************************************************************ + * Definitions + ************************************************************/ + +/************************************************************ + * Private Type Declarations + ************************************************************/ + +/************************************************************ + * Private Function Prototypes + ************************************************************/ + +/************************************************************ + * Global Constant Data + ************************************************************/ + +/************************************************************ + * Global Variables + ************************************************************/ + +/************************************************************ + * Private Constant Data + ************************************************************/ + +/************************************************************ + * Private Variables + ************************************************************/ + +/************************************************************ + * Global Functions + ************************************************************/ + +/************************************************************ + * fflush + ************************************************************/ + +/* Called by the OS when a task exits */ + +void lib_flushall(struct streamlist *list) +{ + /* Make sure that there are streams associated with this thread */ + if (list) + { + int i; + + /* Process each stream in the thread's stream list */ + + stream_semtake(list); + for (i = 0; i < CONFIG_NFILE_STREAMS; i++) + { + /* If the stream is open (i.e., assigned a non- + * negative file descriptor), then flush the + * stream. + */ + + if (list->sl_streams[i].fs_filedes >= 0) + { + (void)fflush(&list->sl_streams[i]); + } + } + stream_semgive(list); + } +} + +int fflush(FILE *stream) +{ +#if CONFIG_STDIO_BUFFER_SIZE > 0 + const unsigned char *src; + size_t bytes_written; + size_t nbuffer; + + if (stream->fs_filedes < 0 || (stream->fs_oflags & O_WROK) == 0) + { + *get_errno_ptr() = EBADF; + return ERROR; + } + + /* How many bytes are used in the buffer now */ + + nbuffer = stream->fs_bufpos - stream->fs_bufstart; + + /* Try to write that amount */ + + src = stream->fs_bufstart; + bytes_written = write(stream->fs_filedes, src, nbuffer); + if (bytes_written < 0) + { + return bytes_written; + } + + /* Update pointers and counts */ + + src += bytes_written; + nbuffer -= bytes_written; + + /* Reset the buffer position to the beginning of the buffer */ + + stream->fs_bufpos = stream->fs_bufstart; + + /* For the case of an incomplete write, nbuffer will be non-zero + * It will hold the number of bytes that were not written. + * Move the data down in the buffer to handle this (rare) case + */ + + while (nbuffer) + { + *stream->fs_bufpos++ = *src++; + --nbuffer; + } + + /* Return the number of bytes remaining in the buffer */ + + return stream->fs_bufpos - stream->fs_bufstart; +#else + return 0; +#endif +} + +#endif /* CONFIG_NFILE_STREAMS */ |