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Add chdir() and getcwd()

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@837 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo
2008-08-22 23:38:33 +00:00
parent 7ccda13225
commit 709263b6d8
11 changed files with 411 additions and 35 deletions
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lib/Makefile
+1 -1
View File
@@ -57,7 +57,7 @@ STDIO_SRCS = lib_printf.c lib_rawprintf.c lib_lowprintf.c lib_dbg.c \
lib_lowstream.c lib_nullstream.c lib_sscanf.c
ifneq ($(CONFIG_NFILE_DESCRIPTORS),0)
STDIO_SRCS += lib_rawstream.c
STDIO_SRCS += lib_rawstream.c lib_chdir.c lib_getcwd.c lib_cwdsem.c
ifneq ($(CONFIG_NFILE_STREAMS),0)
STDIO_SRCS += lib_fopen.c lib_fclose.c lib_fread.c lib_libfread.c lib_fseek.c \
lib_fgetc.c lib_fgets.c lib_gets.c lib_fwrite.c lib_libfwrite.c \
lib/lib_chdir.c
+131
View File
@@ -0,0 +1,131 @@
/****************************************************************************
* lib/lib_chdir.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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include "lib_internal.h"
/****************************************************************************
* Public Variables
****************************************************************************/
#if CONFIG_NFILE_DESCRIPTORS > 0
char *g_cwd = NULL;
char *g_prevcwd = NULL;
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: chdir
*
* Description:
* The chdir() function causes the directory named by the pathname pointed
* to by the 'path' argument to become the current working directory; that
* is, the starting point for path searches for pathnames not beginning
* with '/'.
*
* Input Parmeters:
* path - A pointer to a directory to use as the new current working
* directory
*
* Returned Value:
* 0(OK) on success; -1(ERROR) on failure with errno set appropriately:
*
* EACCES
* Search permission is denied for any component of the pathname.
* ELOOP
* A loop exists in symbolic links encountered during resolution of the
* 'path' argument OR more that SYMLOOP_MAX symbolic links in the
* resolution of the 'path' argument.
* ENAMETOOLONG
* The length of the path argument exceeds PATH_MAX or a pathname component
* is longer than NAME_MAX.
* ENOENT
* A component of 'path' does not name an existing directory or path is
* an empty string.
* ENOTDIR
* A component of the pathname is not a directory.
*
****************************************************************************/
int chdir(FAR const char *path)
{
char *duppath;
/* Verify the input parameters */
if (!path)
{
errno = ENOENT;
return ERROR;
}
/* Verify that 'path' refers to a directory */
/* (To be provided) */
/* Make a persistent copy of 'path' */
duppath = strdup(path);
/* Free any preceding cwd and set the previous to the cwd (this
* is to support 'cd -' in NSH
*/
cwd_semtake();
if (g_prevcwd)
{
free(g_prevcwd);
}
g_prevcwd = g_cwd;
/* Set the cwd to a persistent copy of the input 'path' */
g_cwd = duppath;
cwd_semgive();
return OK;
}
#endif /* CONFIG_NFILE_DESCRIPTORS */
lib/lib_cwdsem.c
+86
View File
@@ -0,0 +1,86 @@
/****************************************************************************
* lib/lib_cwdsem.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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <unistd.h>
#include <assert.h>
#include <semaphore.h>
#include <errno.h>
/****************************************************************************
* Private Variables
****************************************************************************/
#if CONFIG_NFILE_DESCRIPTORS > 0
static sem_t g_cwdsem = { 1 };
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: cwd_semtake
****************************************************************************/
void cwd_semtake(void)
{
/* Take the semaphore (perhaps waiting) */
while (sem_wait(&g_cwdsem) != 0)
{
/* The only case that an error should occr here is if the wait was
* awakened by a signal.
*/
ASSERT(errno == EINTR);
}
}
/****************************************************************************
* Name: cwd_semgive
****************************************************************************/
void cwd_semgive(void)
{
/* Give the semaphore */
(void)sem_post(&g_cwdsem);
}
#endif /* CONFIG_NFILE_DESCRIPTORS */
lib/lib_getcwd.c
+139
View File
@@ -0,0 +1,139 @@
/****************************************************************************
* lib/lib_getcwd.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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include "lib_internal.h"
/****************************************************************************
* Definitions
****************************************************************************/
/****************************************************************************
* Public Variables
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: getwcd
*
* Description:
* getcwd() function places the absolute pathname of the current working
* directory in the array pointed to by 'buf', and returns 'buf.' The
* pathname copied to the array shall contain no components that are
* symbolic links. The 'size' argument is the size in bytes of the
* character array pointed to by the 'buf' argument.
*
* Input Parmeters:
* buf - a pointer to the location in which the current working directory
* pathaname is returned.
* size - The size in bytes avaiable at 'buf'
*
* Returned Value:
* Upon successful completion, getcwd() returns the 'buf' argument.
* Otherwise, getcwd() returns a null pointer and sets errno to indicate
* the error:
*
* EINVAL
* The 'size' argument is 0 or the 'buf' argument is NULL.
* ERANGE
* The size argument is greater than 0, but is smaller than the length
* of the currrent working directory pathname +1.
* EACCES
* Read or search permission was denied for a component of the pathname.
* ENOMEM
* Insufficient storage space is available.
*
****************************************************************************/
#if CONFIG_NFILE_DESCRIPTORS > 0
FAR char *getcwd(FAR char *buf, size_t size)
{
const char *ptr;
int err;
/* Verify input parameters */
if (!buf || !size)
{
err = EINVAL;
goto errout;
}
/* If no working directory is defined, then default to the home directory */
cwd_semtake();
if (g_cwd)
{
ptr = g_cwd;
}
else
{
ptr = CONFIG_LIB_HOMEDIR;
}
/* Verify that the cwd will fit into the user-provided buffer */
if (strlen(ptr) + 1 > size)
{
err = ERANGE;
goto errout_with_sem;
}
/* Copy the cwd to the user buffer */
strcpy(buf, ptr);
cwd_semgive();
return buf;
errout_with_sem:
cwd_semgive();
errout:
errno = err;
return NULL;
}
#endif /* CONFIG_NFILE_DESCRIPTORS */
lib/lib_internal.h
+29 -15
View File
@@ -1,7 +1,7 @@
/************************************************************
* lib_internal.h
/****************************************************************************
* lib/lib_internal.h
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
@@ -14,7 +14,7 @@
* 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
* 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.
*
@@ -31,22 +31,26 @@
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
************************************************************/
****************************************************************************/
#ifndef __LIB_INTERNAL_H
#define __LIB_INTERNAL_H
/************************************************************
/****************************************************************************
* Included Files
************************************************************/
****************************************************************************/
#include <nuttx/config.h>
#include <stdio.h>
#include <semaphore.h>
/************************************************************
/****************************************************************************
* Definitions
************************************************************/
****************************************************************************/
#ifndef CONFIG_LIB_HOMEDIR
# define CONFIG_LIB_HOMEDIR "/"
#endif
#if CONFIG_STDIO_BUFFER_SIZE <= 0
# define lib_sem_initialize(s)
@@ -56,9 +60,9 @@
#define LIB_BUFLEN_UNKNOWN (0x7fffffff)
/************************************************************
/****************************************************************************
* Public Types
************************************************************/
****************************************************************************/
/* This is the generic for of a stream used by the library
* to manage variable sized output.
@@ -94,13 +98,18 @@ struct lib_rawstream_s
int fd;
};
/************************************************************
/****************************************************************************
* Public Variables
************************************************************/
****************************************************************************/
#if CONFIG_NFILE_DESCRIPTORS > 0
extern char *g_cwd; /* Defined in lib_chdir.c */
extern char *g_prevcwd; /* Defined in lib_chdir.c */
#endif
/************************************************************
/****************************************************************************
* Public Function Prototypes
************************************************************/
****************************************************************************/
/* Defined in lib_streamsem.c */
@@ -184,4 +193,9 @@ extern void lib_give_semaphore(FAR struct file_struct *stream);
extern int lib_getbase(const char *nptr, const char **endptr);
/* Defined in lib_cwdsem.c */
extern void cwd_semtake(void);
extern void cwd_semgive(void);
#endif /* __LIB_INTERNAL_H */
lib/lib_strlen.c
+9 -13
View File
@@ -1,7 +1,7 @@
/************************************************************
* lib_strlen.c
/****************************************************************************
* lib/lib_strlen.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
@@ -14,7 +14,7 @@
* 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
* 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.
*
@@ -31,23 +31,19 @@
* 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 <string.h>
/************************************************************
/****************************************************************************
* Global Functions
************************************************************/
****************************************************************************/
#ifndef CONFIG_ARCH_STRLEN
size_t strlen(const char *s)