632 lines
16 KiB
C
632 lines
16 KiB
C
/****************************************************************************
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* apps/nshlib/nsh_fsutils.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 <sys/types.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <assert.h>
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#include <unistd.h>
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#include "nsh.h"
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#include "nsh_console.h"
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct getpid_arg_s
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{
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FAR const char *name;
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FAR pid_t *pids;
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size_t count;
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size_t next;
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: getpid_callback
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*
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* Description:
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* It is a callback function of nsh_getpid
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*
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****************************************************************************/
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#if defined(CONFIG_FS_PROCFS) && !defined(CONFIG_NSH_DISABLE_PIDOF)
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static int getpid_callback(FAR struct nsh_vtbl_s *vtbl,
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FAR const char *dirpath,
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FAR struct dirent *entryp, FAR void *pvarg)
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{
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FAR struct getpid_arg_s *arg = (FAR struct getpid_arg_s *)pvarg;
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char buffer[PATH_MAX];
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int fd;
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int len;
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if (arg->next == arg->count)
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{
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return -E2BIG;
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}
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/* Match the name of the process */
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snprintf(buffer, sizeof(buffer), "%s/%s/cmdline", dirpath, entryp->d_name);
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fd = open(buffer, O_RDONLY);
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if (fd < 0)
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{
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return 0;
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}
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len = read(fd, buffer, sizeof(buffer) - 1);
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close(fd);
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if (len < 0)
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{
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return -errno;
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}
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buffer[len] = '\0';
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len = strlen(arg->name);
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if (strncmp(buffer, arg->name, len) == 0 &&
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(isspace(buffer[len]) || buffer[len] == '\0'))
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{
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arg->pids[arg->next++] = atoi(entryp->d_name);
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}
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return OK;
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}
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nsh_catfile
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*
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* Description:
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* Dump the contents of a file to the current NSH terminal.
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*
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* Input Paratemets:
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* vtbl - session vtbl
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* cmd - NSH command name to use in error reporting
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* filepath - The full path to the file to be dumped
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*
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* Returned Value:
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* Zero (OK) on success; -1 (ERROR) on failure.
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*
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****************************************************************************/
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#ifdef NSH_HAVE_CATFILE
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int nsh_catfile(FAR struct nsh_vtbl_s *vtbl, FAR const char *cmd,
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FAR const char *filepath)
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{
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FAR char *buffer;
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int fd;
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int ret = OK;
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/* Open the file for reading */
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fd = open(filepath, O_RDONLY);
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if (fd < 0)
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{
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#if defined(CONFIG_NSH_PROC_MOUNTPOINT)
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if (strncmp(filepath, CONFIG_NSH_PROC_MOUNTPOINT,
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sizeof(CONFIG_NSH_PROC_MOUNTPOINT) - 1) == 0)
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{
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nsh_error(vtbl,
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"nsh: %s: Could not open %s (is procfs mounted?)\n",
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cmd, filepath);
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}
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#endif
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nsh_error(vtbl, g_fmtcmdfailed, cmd, "open", NSH_ERRNO);
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return ERROR;
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}
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buffer = (FAR char *)malloc(IOBUFFERSIZE);
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if (buffer == NULL)
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{
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close(fd);
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nsh_error(vtbl, g_fmtcmdfailed, cmd, "malloc", NSH_ERRNO);
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return ERROR;
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}
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/* And just dump it byte for byte into stdout */
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for (; ; )
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{
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int nbytesread = read(fd, buffer, IOBUFFERSIZE);
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/* Check for read errors */
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if (nbytesread < 0)
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{
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int errval = errno;
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/* EINTR is not an error (but will stop stop the cat) */
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if (errval == EINTR)
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{
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nsh_error(vtbl, g_fmtsignalrecvd, cmd);
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}
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else
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{
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nsh_error(vtbl, g_fmtcmdfailed, cmd, "read",
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NSH_ERRNO_OF(errval));
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}
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ret = ERROR;
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break;
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}
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/* Check for data successfully read */
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else if (nbytesread > 0)
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{
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int nbyteswritten = 0;
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while (nbyteswritten < nbytesread)
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{
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ssize_t n = nsh_write(vtbl, buffer + nbyteswritten,
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nbytesread - nbyteswritten);
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if (n < 0)
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{
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int errcode = errno;
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/* EINTR is not an error (but will stop stop the cat) */
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if (errcode == EINTR)
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{
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nsh_error(vtbl, g_fmtsignalrecvd, cmd);
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}
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else
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{
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nsh_error(vtbl, g_fmtcmdfailed, cmd, "write",
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NSH_ERRNO_OF(errcode));
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}
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ret = ERROR;
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break;
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}
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else
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{
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nbyteswritten += n;
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}
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}
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}
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/* Otherwise, it is the end of file */
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else
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{
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break;
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}
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}
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/* NOTE that the following NSH prompt may appear on the same line as file
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* content. The IEEE Std requires that "The standard output shall
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* contain the sequence of bytes read from the input files. Nothing else
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* shall be written to the standard output." Reference:
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* https://pubs.opengroup.org/onlinepubs/009695399/utilities/cat.html.
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*/
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/* Close the input file and return the result */
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close(fd);
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free(buffer);
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return ret;
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}
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#endif
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/****************************************************************************
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* Name: nsh_readfile
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*
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* Description:
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* Read a small file into a user-provided buffer. The data is assumed to
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* be a string and is guaranteed to be NUL-terminated. An error occurs if
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* the file content (+terminator) will not fit into the provided 'buffer'.
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*
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* Input Parameters:
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* vtbl - The console vtable
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* filepath - The full path to the file to be read
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* buffer - The user-provided buffer into which the file is read.
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* buflen - The size of the user provided buffer
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*
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* Returned Value:
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* Zero (OK) is returned on success; -1 (ERROR) is returned on any
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* failure to read the fil into the buffer.
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*
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****************************************************************************/
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#ifdef NSH_HAVE_READFILE
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int nsh_readfile(FAR struct nsh_vtbl_s *vtbl, FAR const char *cmd,
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FAR const char *filepath, FAR char *buffer, size_t buflen)
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{
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FAR char *bufptr;
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size_t remaining;
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ssize_t nread;
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ssize_t ntotal;
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int fd;
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int ret;
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/* Open the file */
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fd = open(filepath, O_RDONLY);
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if (fd < 0)
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{
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nsh_error(vtbl, g_fmtcmdfailed, cmd, "open", NSH_ERRNO);
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return ERROR;
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}
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/* Read until we hit the end of the file, until we have exhausted the
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* buffer space, or until some irrecoverable error occurs
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*/
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ntotal = 0; /* No bytes read yet */
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*buffer = '\0'; /* NUL terminate the empty buffer */
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bufptr = buffer; /* Working pointer */
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remaining = buflen - 1; /* Reserve one byte for a NUL terminator */
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ret = ERROR; /* Assume failure */
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do
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{
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nread = read(fd, bufptr, remaining);
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if (nread < 0)
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{
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/* Read error */
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int errcode = errno;
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DEBUGASSERT(errcode > 0);
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/* EINTR is not a read error. It simply means that a signal was
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* received while waiting for the read to complete.
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*/
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if (errcode != EINTR)
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{
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/* Fatal error */
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nsh_error(vtbl, g_fmtcmdfailed, cmd, "read", NSH_ERRNO);
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break;
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}
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}
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else if (nread == 0)
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{
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/* End of file */
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ret = OK;
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break;
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}
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else
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{
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/* Successful read. Make sure that the buffer is null terminated */
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DEBUGASSERT(nread <= (ssize_t)remaining);
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ntotal += nread;
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buffer[ntotal] = '\0';
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/* Bump up the read count and continuing reading to the end of
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* file.
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*/
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bufptr += nread;
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remaining -= nread;
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}
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}
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while (buflen > 0);
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/* Close the file and return. */
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close(fd);
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return ret;
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}
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#endif
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/****************************************************************************
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* Name: nsh_writefile
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*
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* Description:
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* Dump the contents of a file to the current NSH terminal.
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*
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* Input Paratemets:
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* vtbl - session vtbl
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* cmd - NSH command name to use in error reporting
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* buffer - The pointer of writing buffer
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* len - The length of writing buffer
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* filepath - The full path to the file to be dumped
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*
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* Returned Value:
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* Zero (OK) on success; -1 (ERROR) on failure.
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*
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****************************************************************************/
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#ifdef NSH_HAVE_WRITEFILE
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int nsh_writefile(FAR struct nsh_vtbl_s *vtbl, FAR const char *cmd,
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FAR const char *buffer, size_t len,
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FAR const char *filepath)
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{
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int fd;
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int ret;
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/* Open the file for reading */
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fd = open(filepath, O_WRONLY);
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if (fd < 0)
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{
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#if defined(CONFIG_NSH_PROC_MOUNTPOINT)
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if (strncmp(filepath, CONFIG_NSH_PROC_MOUNTPOINT,
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sizeof(CONFIG_NSH_PROC_MOUNTPOINT) - 1) == 0)
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{
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nsh_error(vtbl,
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"nsh: %s: Could not open %s (is procfs mounted?)\n",
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cmd, filepath);
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}
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#endif
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nsh_error(vtbl, g_fmtcmdfailed, cmd, "open", NSH_ERRNO);
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return ERROR;
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}
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ret = write(fd, buffer, len);
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if (ret < 0)
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{
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nsh_error(vtbl, g_fmtcmdfailed, cmd, "write", NSH_ERRNO);
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}
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close(fd);
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return ret > 0 ? OK : ERROR;
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}
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#endif
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/****************************************************************************
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* Name: nsh_foreach_direntry
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*
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* Description:
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* Call the provided 'handler' for each entry found in the directory at
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* 'dirpath'.
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*
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* Input Parameters
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* vtbl - The console vtable
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* cmd - NSH command name to use in error reporting
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* dirpath - The full path to the directory to be traversed
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* handler - The handler to be called for each entry of the directory
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* pvarg - User provided argument to be passed to the 'handler'
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*
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* Returned Value:
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* Zero (OK) returned on success; -1 (ERROR) returned on failure.
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*
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****************************************************************************/
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#ifdef NSH_HAVE_FOREACH_DIRENTRY
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int nsh_foreach_direntry(FAR struct nsh_vtbl_s *vtbl, FAR const char *cmd,
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FAR const char *dirpath,
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nsh_direntry_handler_t handler, void *pvarg)
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{
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DIR *dirp;
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int ret = OK;
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/* Open the directory */
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dirp = opendir(dirpath);
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if (dirp == NULL)
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{
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/* Failed to open the directory */
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#if defined(CONFIG_NSH_PROC_MOUNTPOINT)
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if (strncmp(dirpath, CONFIG_NSH_PROC_MOUNTPOINT,
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sizeof(CONFIG_NSH_PROC_MOUNTPOINT) - 1) == 0)
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{
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nsh_error(vtbl,
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"nsh: %s: Could not open %s (is procfs mounted?)\n",
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cmd, dirpath);
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}
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#endif
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nsh_error(vtbl, g_fmtcmdfailed, cmd, "opendir", NSH_ERRNO);
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return ERROR;
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}
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/* Read each directory entry */
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for (; ; )
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{
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FAR struct dirent *entryp = readdir(dirp);
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if (entryp == NULL)
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{
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/* Finished with this directory */
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break;
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}
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/* Call the handler with this directory entry */
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if (handler(vtbl, dirpath, entryp, pvarg) < 0)
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{
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/* The handler reported a problem */
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ret = ERROR;
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break;
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}
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}
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closedir(dirp);
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return ret;
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}
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#endif
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/****************************************************************************
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* Name: nsh_trimdir
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*
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* Description:
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* Skip any trailing '/' characters (unless it is also the leading '/')
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*
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* Input Parameters:
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* dirpath - The directory path to be trimmed. May be modified!
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*
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* Returned value:
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* None
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*
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****************************************************************************/
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#ifdef NSH_HAVE_TRIMDIR
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void nsh_trimdir(FAR char *dirpath)
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{
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/* Skip any trailing '/' characters (unless it is also the leading '/') */
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int len = strlen(dirpath) - 1;
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while (len > 0 && dirpath[len] == '/')
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{
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dirpath[len] = '\0';
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len--;
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}
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}
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#endif
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/****************************************************************************
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* Name: nsh_trimspaces
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*
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* Description:
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* Trim any leading or trailing spaces from a string.
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*
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* Input Parameters:
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* str - The string to be trimmed. May be modified!
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*
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* Returned value:
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* The new string pointer.
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*
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****************************************************************************/
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#ifdef NSH_HAVE_TRIMSPACES
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FAR char *nsh_trimspaces(FAR char *str)
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{
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FAR char *trimmed;
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int ndx;
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/* Strip leading whitespace from the value */
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for (trimmed = str;
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*trimmed != '\0' && isspace(*trimmed);
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trimmed++);
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/* Strip trailing whitespace from the value */
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for (ndx = strlen(trimmed) - 1;
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ndx >= 0 && isspace(trimmed[ndx]);
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ndx--)
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{
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trimmed[ndx] = '\0';
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}
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return trimmed;
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}
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#endif
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/****************************************************************************
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* Name: nsh_getdirpath
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*
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* Description:
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* Combine dirpath with a file/path, this will generated a new string,
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* which need free outside.
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*
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* Input Parameters:
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* dirpath - the dirpath
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* path - the file/path
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*
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* Returned value:
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* The new string pointer, need free in caller.
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*
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****************************************************************************/
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#ifdef NSH_HAVE_IOBUFFER
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FAR char *nsh_getdirpath(FAR struct nsh_vtbl_s *vtbl,
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FAR const char *dirpath, FAR const char *path)
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{
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/* Handle the case where all that is left is '/' */
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if (strcmp(dirpath, "/") == 0)
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{
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snprintf(vtbl->iobuffer, IOBUFFERSIZE, "/%s", path);
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}
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else
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{
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snprintf(vtbl->iobuffer, IOBUFFERSIZE, "%s/%s", dirpath, path);
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}
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return strdup(vtbl->iobuffer);
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}
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#endif
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/****************************************************************************
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|
* Name: nsh_getpid
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|
*
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* Description:
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* Obtain pid through process name
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*
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* Input Parameters:
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* vtbl - NSH session data
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* name - the name of the process
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* pids - allocated array for storing pid
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|
* count - the maximum number of pids obtained
|
|
*
|
|
* Returned value:
|
|
* the actual number of pids obtained
|
|
*
|
|
****************************************************************************/
|
|
|
|
#if defined(CONFIG_FS_PROCFS) && !defined(CONFIG_NSH_DISABLE_PIDOF)
|
|
ssize_t nsh_getpid(FAR struct nsh_vtbl_s *vtbl, FAR const char *name,
|
|
FAR pid_t *pids, size_t count)
|
|
{
|
|
struct getpid_arg_s argv =
|
|
{
|
|
name,
|
|
pids,
|
|
count,
|
|
0
|
|
};
|
|
|
|
if (NULL == name || pids == NULL)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* No need to determine the return value */
|
|
|
|
nsh_foreach_direntry(vtbl, "pidof", CONFIG_NSH_PROC_MOUNTPOINT,
|
|
getpid_callback, &argv);
|
|
|
|
return argv.next;
|
|
}
|
|
#endif
|