touch.c

/* Copyright (c) 2008, Tim Post <tinkertim@gmail.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 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.
 *
 * Neither the name of the original program's authors 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.
 */

/* TODO: Options that people would expect, such as not creating the file if
 * it doesn't exist, specifying the access time, etc */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <dirent.h>
#include <sys/types.h>
#include <str.h>

#include "config.h"
#include "errors.h"
#include "util.h"
#include "entry.h"
#include "touch.h"
#include "cmds.h"

static const char *cmdname = "touch";

/* Dispays help for touch in various levels */
void help_cmd_touch(unsigned int level)
{
        if (level == HELP_SHORT) {
                printf("`%s' updates access times for files\n", cmdname);
        } else {
                help_cmd_touch(HELP_SHORT);
                printf("  `%s' <file>, if the file does not exist it will be "
                                "created\n", cmdname);
        }

        return;
}

/* Main entry point for touch, accepts an array of arguments */
int cmd_touch(char **argv)
{
        unsigned int argc, i = 0, ret = 0;
        int fd;
        char *buff = NULL;

        DIR *dirp;

        argc = cli_count_args(argv);

        if (argc == 1) {
                printf("%s - incorrect number of arguments. Try `help %s extended'\n",
                        cmdname, cmdname);
                return CMD_FAILURE;
        }

        for (i = 1; i < argc; i ++) {
                buff = str_dup(argv[i]);
                dirp = opendir(buff);
                if (dirp) {
                        cli_error(CL_ENOTSUP, "%s is a directory", buff);
                        closedir(dirp);
                        ret ++;
                        continue;
                }

                fd = open(buff, O_RDWR | O_CREAT);
                if (fd < 0) {
                        cli_error(CL_EFAIL, "Could not update / create %s ", buff);
                        ret ++;
                        continue;
                } else
                        close(fd);

                free(buff);
        }

        if (ret)
                return CMD_FAILURE;
        else
                return CMD_SUCCESS;
}

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