/*******************************************************************************
*
* timestamp++.c
*       
* AUTHOR:
*   Dan Harkless                                                    <opensource@
*   http://harkless.org/dan/software/                              harkless.org>
* 
* COPYRIGHT:
*   This file is Copyright (C) 2002 by Dan Harkless, and is released under the
*   GNU General Public License <http://www.gnu.org/copyleft/gpl.html>.
*
* USAGE:  
*   % timestamp++ <file_1> [<file_2>...]
*
* DESCRIPTION:                                                               
*   Increments the modification time on one or more files by 1 second.  The
*   access time of the file(s) will be preserved.  If one of the specified files
*   doesn't exist or has a permissions problem, an error will be issued and the
*   program will ultimately exit with nonzero status, but the remaining files
*   will still be processed in the meantime.
*                                                                            
* DATE        MODIFICATION
* ==========  ==================================================================
* 2002-03-16  Upgraded to work with more than one file.
* 1999-04-09  Failing to open a file doesn't necessarily mean it doesn't exist.
* 1998-02-24  Original.
*
*******************************************************************************/
 

#include <sys/types.h>  /* supposed to precede <sys/stat.h> and <utime.h> */

#include <errno.h>      /* for errno */
#include <stdio.h>      /* for fprintf(), etc. */
#include <stdlib.h>     /* for EXIT_FAILURE and EXIT_SUCCESS */
#include <string.h>     /* for strerror() and strrchr() */
#include <sys/stat.h>   /* for stat() and struct stat */
#include <utime.h>      /* for struct utimbuf and utime() */


int  main(int  argc, char**  argv) {
    char*     last_slash = strrchr(argv[0], '/');
    char*     our_program_name;
    int       exit_status = EXIT_SUCCESS, i;

    if (last_slash == NULL)
	our_program_name = argv[0];
    else
	our_program_name = last_slash + 1;
    
    if (argc < 2) {
        fprintf(stderr, "Usage: %s <file_1> [<file_2>...]\n", our_program_name);
        return EXIT_FAILURE;
    }

    for (i = 1; i < argc; i++) {
	struct stat  file_stat;

	if (stat(argv[i], &file_stat) < 0) {
	    fprintf(stderr, "%s: \"%s\": %s.\n",
		    our_program_name, argv[i], strerror(errno));
	    exit_status = EXIT_FAILURE;
	}
	else {
	    struct utimbuf  timestamp_struct;
	    
	    timestamp_struct.actime = file_stat.st_atime;
	    timestamp_struct.modtime = file_stat.st_mtime + 1;
	    
	    if (utime(argv[i], &timestamp_struct) < 0) {
		fprintf(stderr, "%s: \"%s\": %s.\n",
			our_program_name, argv[i], strerror(errno));
		exit_status = EXIT_FAILURE;
	    }
	}
    }

    return exit_status;
}