f1236da21c
POSIX require file system shouldn't enable the \r and \n conversion by default Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
329 lines
8.3 KiB
C
329 lines
8.3 KiB
C
/****************************************************************************
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* libs/libc/stdio/lib_fopen.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <string.h>
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#include <assert.h>
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#include <errno.h>
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#include "libc.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Open mode flags */
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#define MODE_R (1 << 0) /* Bit 0: "r{b|x|+}" open for reading */
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#define MODE_W (1 << 1) /* Bit 1: "w{b|x|+}" open for writing, truncating,
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* or creating file */
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#define MODE_A (1 << 2) /* Bit 2: "a{b|x|+}" open for writing, appending
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* the to file */
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#define MODE_NONE 0 /* No access mode determined */
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#define MODE_MASK (MODE_R | MODE_W | MODE_A)
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#define FLAG_KEEP (O_TEXT | O_CLOEXEC | O_EXCL)
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: fdopen
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****************************************************************************/
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FAR FILE *fdopen(int fd, FAR const char *mode)
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{
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FAR FILE *filep = NULL;
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int oflags;
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int ret;
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/* Map the open mode string to open flags */
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oflags = lib_mode2oflags(mode);
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if (oflags >= 0)
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{
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ret = fs_fdopen(fd, oflags, NULL, &filep);
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if (ret < 0)
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{
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set_errno(-ret);
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}
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}
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return filep;
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}
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/****************************************************************************
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* Name: fopen
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****************************************************************************/
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FAR FILE *fopen(FAR const char *path, FAR const char *mode)
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{
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FAR FILE *filep = NULL;
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int oflags;
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int fd;
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int ret;
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/* Map the open mode string to open flags */
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oflags = lib_mode2oflags(mode);
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if (oflags < 0)
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{
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return NULL;
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}
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/* Open the file */
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fd = open(path, oflags, 0666);
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/* If the open was successful, then call fdopen() using the file
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* descriptor returned by open. If open failed, then just return the
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* NULL stream -- open() has already set the errno.
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*/
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if (fd >= 0)
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{
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ret = fs_fdopen(fd, oflags, NULL, &filep);
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if (ret < 0)
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{
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/* Don't forget to close the file descriptor if any other
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* failures are reported by fdopen().
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*/
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close(fd);
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set_errno(-ret);
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filep = NULL;
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}
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}
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return filep;
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}
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/****************************************************************************
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* Name: lib_mode2oflags
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****************************************************************************/
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int lib_mode2oflags(FAR const char *mode)
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{
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unsigned int state;
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int oflags;
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/* Verify that a mode string was provided. */
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DEBUGASSERT(mode);
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/* Parse the mode string to determine the corresponding open flags */
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state = MODE_NONE;
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oflags = 0;
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for (; *mode; mode++)
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{
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switch (*mode)
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{
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/* Open for read access ("r{b|x|+}") */
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case 'r' :
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if (state == MODE_NONE)
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{
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/* Open for read access */
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oflags = O_RDOK | O_TEXT;
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state = MODE_R;
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}
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else
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{
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goto errout;
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}
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break;
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/* Open for write access ("w{b|x|+}") */
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case 'w' :
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if (state == MODE_NONE)
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{
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/* Open for write access, truncating any existing file */
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oflags = O_WROK | O_CREAT | O_TRUNC | O_TEXT;
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state = MODE_W;
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}
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else
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{
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goto errout;
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}
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break;
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/* Open for write/append access ("a{b|x|+}") */
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case 'a' :
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if (state == MODE_NONE)
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{
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/* Write to the end of the file */
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oflags = O_WROK | O_CREAT | O_APPEND | O_TEXT;
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state = MODE_A;
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}
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else
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{
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goto errout;
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}
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break;
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/* Open for update access ("{r|w|a|b|x}+") */
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case '+' :
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switch (state & MODE_MASK)
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{
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case MODE_R:
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{
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/* Retain any binary and exclusive mode selections */
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oflags &= FLAG_KEEP;
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/* Open for read/write access */
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oflags |= O_RDWR;
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}
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break;
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case MODE_W:
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{
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/* Retain any binary and exclusive mode selections */
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oflags &= FLAG_KEEP;
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/* Open for write read/access, truncating any existing
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* file.
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*/
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oflags |= O_RDWR | O_CREAT | O_TRUNC;
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}
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break;
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case MODE_A:
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{
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/* Retain any binary and exclusive mode selections */
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oflags &= FLAG_KEEP;
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/* Read from the beginning of the file; write to the
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* end,
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*/
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oflags |= O_RDWR | O_CREAT | O_APPEND;
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}
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break;
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default:
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goto errout;
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break;
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}
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break;
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/* Open for binary access ("{r|w|a|x|+}b") */
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case 'b' :
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if ((state & MODE_MASK) != MODE_NONE)
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{
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/* The file is opened in binary mode */
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oflags &= ~O_TEXT;
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}
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else
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{
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goto errout;
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}
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break;
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/* Open for close on execute */
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case 'e' :
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if ((state & MODE_MASK) != MODE_NONE)
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{
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/* The file will be closed on execute */
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oflags |= O_CLOEXEC;
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}
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else
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{
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goto errout;
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}
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break;
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/* Open for exclusive access ("{r|w|a|b|+}x") */
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case 'x' :
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if ((state & MODE_MASK) != MODE_NONE)
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{
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/* The file is opened in exclusive mode */
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oflags |= O_EXCL;
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}
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else
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{
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goto errout;
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}
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break;
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/* Open for text (translated) access ("{r|w|a|x|+}t") */
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case 't' :
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if ((state & MODE_MASK) != MODE_NONE)
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{
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/* The file is opened in text mode */
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oflags |= O_TEXT;
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}
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else
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{
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goto errout;
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}
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break;
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/* Unrecognized or unsupported mode */
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default:
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goto errout;
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break;
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}
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}
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return oflags;
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/* Both fopen and fdopen should fail with errno == EINVAL if the mode
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* string is invalid.
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*/
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errout:
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set_errno(EINVAL);
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return ERROR;
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}
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