incubator-nuttx/binfmt/binfmt_copyargv.c

188 lines
5.3 KiB
C

/****************************************************************************
* binfmt/binfmt_copyargv.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 <string.h>
#include <debug.h>
#include <errno.h>
#include <nuttx/kmalloc.h>
#include <nuttx/binfmt/binfmt.h>
#include "binfmt.h"
#ifndef CONFIG_BINFMT_DISABLE
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* This is an artificial limit to detect error conditions where an argv[]
* list is not properly terminated.
*/
#define MAX_EXEC_ARGS 256
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: binfmt_copyargv
*
* Description:
* In the kernel build, the argv list will likely lie in the caller's
* address environment and, hence, be inaccessible when we switch to the
* address environment of the new process address environment. So we
* do not have any real option other than to copy the callers argv[] list.
*
* Input Parameters:
* bin - Load structure
* argv - Argument list
*
* Returned Value:
* Zero (OK) on success; a negated error value on failure.
*
****************************************************************************/
int binfmt_copyargv(FAR struct binary_s *bin, FAR char * const *argv)
{
#if defined(CONFIG_ARCH_ADDRENV) && defined(CONFIG_BUILD_KERNEL)
FAR char *ptr;
size_t argvsize;
size_t argsize;
int nargs;
int i;
/* Get the number of arguments and the size of the argument list */
bin->argv = (FAR char **)NULL;
bin->argbuffer = (FAR char *)NULL;
if (argv)
{
argsize = 0;
nargs = 0;
for (i = 0; argv[i]; i++)
{
/* Increment the size of the allocation with the size of the next
* string
*/
argsize += (strlen(argv[i]) + 1);
nargs++;
/* This is a sanity check to prevent running away with an
* unterminated argv[] list.
* MAX_EXEC_ARGS should be sufficiently large that this
* never happens in normal usage.
*/
if (nargs > MAX_EXEC_ARGS)
{
berr("ERROR: Too many arguments: %lu\n",
(unsigned long)argvsize);
return -E2BIG;
}
}
binfo("args=%d argsize=%lu\n", nargs, (unsigned long)argsize);
/* Allocate the argv array and an argument buffer */
if (argsize > 0)
{
argvsize = (nargs + 1) * sizeof(FAR char *);
bin->argbuffer = (FAR char *)kmm_malloc(argvsize + argsize);
if (!bin->argbuffer)
{
berr("ERROR: Failed to allocate the argument buffer\n");
return -ENOMEM;
}
/* Copy the argv list */
bin->argv = (FAR char **)bin->argbuffer;
ptr = bin->argbuffer + argvsize;
for (i = 0; argv[i]; i++)
{
bin->argv[i] = ptr;
argsize = strlen(argv[i]) + 1;
memcpy(ptr, argv[i], argsize);
ptr += argsize;
}
/* Terminate the argv[] list */
bin->argv[i] = (FAR char *)NULL;
}
}
return OK;
#else
/* Just save the caller's argv pointer */
bin->argv = argv;
return OK;
#endif
}
/****************************************************************************
* Name: binfmt_freeargv
*
* Description:
* Release the copied argv[] list.
*
* Input Parameters:
* binp - Load structure
*
* Returned Value:
* None
*
****************************************************************************/
#if defined(CONFIG_ARCH_ADDRENV) && defined(CONFIG_BUILD_KERNEL)
void binfmt_freeargv(FAR struct binary_s *binp)
{
/* Is there an allocated argument buffer */
if (binp->argbuffer)
{
/* Free the argument buffer */
kmm_free(binp->argbuffer);
}
/* Nullify the allocated argv[] array and the argument buffer pointers */
binp->argbuffer = (FAR char *)NULL;
binp->argv = (FAR char **)NULL;
}
#endif
#endif /* !CONFIG_BINFMT_DISABLE */