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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2008-09-01 20:35:41 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2008-09-01 20:35:41 +0000 |
commit | 671926c39c76b0bfb6442431bbdc6c85c21d7087 (patch) | |
tree | 414dd03cce0e7d3e0b3f5c057323c9d7e4a44b34 /nuttx/lib/lib_fgetpos.c | |
parent | ff578ec6f9ee1e0f015112924621e6ea5593883a (diff) | |
download | px4-nuttx-671926c39c76b0bfb6442431bbdc6c85c21d7087.tar.gz px4-nuttx-671926c39c76b0bfb6442431bbdc6c85c21d7087.tar.bz2 px4-nuttx-671926c39c76b0bfb6442431bbdc6c85c21d7087.zip |
Fix fseek/ftell; add fsetpos/fgetpos
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@862 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/lib/lib_fgetpos.c')
-rw-r--r-- | nuttx/lib/lib_fgetpos.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/nuttx/lib/lib_fgetpos.c b/nuttx/lib/lib_fgetpos.c new file mode 100644 index 000000000..92044a54c --- /dev/null +++ b/nuttx/lib/lib_fgetpos.c @@ -0,0 +1,125 @@ +/**************************************************************************** + * lib/lib_fgetpos.c + * + * Copyright (C) 2008 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 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. + * + ****************************************************************************/ + +/**************************************************************************** + * Compilation Switches + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <sys/types.h> +#include <stdio.h> +#include <unistd.h> +#include <fcntl.h> +#include <errno.h> + +#include "lib_internal.h" + +/**************************************************************************** + * Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Type Declarations + ****************************************************************************/ + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +/**************************************************************************** + * Global Constant Data + ****************************************************************************/ + +/**************************************************************************** + * Global Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Constant Data + ****************************************************************************/ + +/**************************************************************************** + * Private Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: fgetpos + * + * Description: + * fgetpos() function is an alternate interfaces equivalent to ftell(). + * It gets the current value of the file offset and store it in the location + * referenced by pos. On some non-UNIX systems an fpos_t object may be a + * complex object and fsetpos may be the only way to portably reposition a + * stream. + * + * Returned Value: + * Zero on succes; -1 on failure with errno set appropriately. + * + ****************************************************************************/ + +int fgetpos(FILE *stream, fpos_t *pos) +{ + long position; + +#if CONFIG_DEBUG + if (!stream || !pos) + { + errno = EINVAL; + return ERROR; + } +#endif + + position = ftell(stream, (off_t)*pos, SEEK_SET); + if (position == -1) + { + return ERROR; + } + + *pos = (fpos_t)pos; + return OK; +} |