/*******************************************************************************
*
* timestamp.c
*       
* AUTHOR:
*   Dan Harkless                                                    <opensource@
*   http://harkless.org/dan/software/                              harkless.org>
* 
* COPYRIGHT:
*   This file is Copyright (C) 1999 by Dan Harkless, and is released under the
*   GNU General Public License <http://www.gnu.org/copyleft/gpl.html>.
*
* USAGE:  
*   % timestamp [<file1> [<file2>...]]
*
* DESCRIPTION:                                                               
*   Prints out the modification time of one or more files in seconds past the
*   epoch.  If no files are specified, gives the current time in that format.
*                                                                            
* DATE        MODIFICATION
* ==========  ==================================================================
* 1999-05-19  Allow the specification of multiple files on the commandline.  If
*             no files are specified, give current time in seconds since epoch.
* 1999-04-09  Failing to open a file doesn't necessarily mean it doesn't exist.
* 1996-05-31  Original.
*
*******************************************************************************/
 

#include <sys/types.h>	/* supposed to precede <sys/stat.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 <time.h>	/* for time() */


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

    if (last_slash == NULL)
	our_program_name = argv[0];
    else
	our_program_name = last_slash + 1;
    
    if (argc == 1)
	/* Print out the current time. */
	printf("%ld\n", time(NULL));
    else {
	int  i;
	
	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[1], strerror(errno));
		exit_status = EXIT_FAILURE;
	    }
	    else if (argc == 2)
		/* Like grep, don't print file name if only one specified. */
		printf("%ld\n", file_stat.st_mtime);
	    else
		/* Like grep, print file name if more than one specified. */
		printf("%s: %ld\n", argv[i], file_stat.st_mtime);
	}
    }

    return exit_status;
}