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rewind: clear the error indicator

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Make rewind() clear the error indicator of the stream
as it's specified by the standards.
This commit is contained in:
YAMAMOTO Takashi 2020-06-24 13:54:30 +09:00 committed by Xiang Xiao
parent d24bd782a9
commit ef5d204fd2
3 changed files with 56 additions and 3 deletions
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2
include/stdio.h
View file

@ -90,7 +90,6 @@
#define putchar(c) fputc(c, stdout)
#define getc(s) fgetc(s)
#define getchar() fgetc(stdin)
#define rewind(s) ((void)fseek((s),0,SEEK_SET))
/* Path to the directory where temporary files can be created */
@ -168,6 +167,7 @@ ssize_t getdelim(FAR char **lineptr, size_t *n, int delimiter,
ssize_t getline(FAR char **lineptr, size_t *n, FAR FILE *stream);
FAR char *gets(FAR char *s);
FAR char *gets_s(FAR char *s, rsize_t n);
void rewind(FAR FILE *stream);
void setbuf(FAR FILE *stream, FAR char *buf);
int setvbuf(FAR FILE *stream, FAR char *buffer, int mode, size_t size);
int ungetc(int c, FAR FILE *stream);

4
libs/libc/stdio/Make.defs
View file

@ -59,8 +59,8 @@ CSRCS += lib_fputs.c lib_ungetc.c lib_vprintf.c lib_fprintf.c lib_vfprintf.c
CSRCS += lib_stdinstream.c lib_stdoutstream.c lib_stdsistream.c
CSRCS += lib_stdsostream.c lib_perror.c lib_feof.c lib_ferror.c
CSRCS += lib_rawinstream.c lib_rawoutstream.c lib_rawsistream.c
CSRCS += lib_rawsostream.c lib_remove.c lib_clearerr.c lib_scanf.c
CSRCS += lib_vscanf.c lib_fscanf.c lib_vfscanf.c lib_tmpfile.c
CSRCS += lib_rawsostream.c lib_remove.c lib_rewind.c lib_clearerr.c
CSRCS += lib_scanf.c lib_vscanf.c lib_fscanf.c lib_vfscanf.c lib_tmpfile.c
endif

53
libs/libc/stdio/lib_rewind.c Normal file
View file

@ -0,0 +1,53 @@
/****************************************************************************
* libs/libc/stdio/lib_rewind.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 <nuttx/config.h>
#include <stdio.h>
#include "libc.h"
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: rewind
****************************************************************************/
void rewind(FAR FILE *stream)
{
/* Verify that we were provided with a stream */
if (!stream)
{
set_errno(EBADF);
return;
}
lib_take_semaphore(stream);
(void) fseek(stream, 0L, SEEK_SET);
stream->fs_flags &= ~__FS_FLAG_ERROR;
lib_give_semaphore(stream);
}