#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <libgen.h>
#include <sys/stat.h>

void usage(FILE *, char *);

void main(int argc, char **argv)
{
    int verbose=0;
    int ch;
    int fd;
    long mode=0666;
    char *end;

    if (argc<2)
    {
        usage(stdout, argv[0]);
        exit(EXIT_SUCCESS);
    }

    while ((ch=getopt(argc, argv, "vm:"))!=-1)
    {
        switch (ch)
        {
            case 'v':
                verbose++;
                break;

            case 'm':
                mode=strtol(optarg, &end, 8);
		if ((*end!='\0') || (mode<0) || (mode>07777))
		{
		    fprintf(stderr, "%s: invalid mode -- %s\n", argv[0], optarg);
		    exit(EXIT_FAILURE);
		}
		umask(0);
		break;

            case '?':
            default:
                usage(stderr, argv[0]);
                exit(EXIT_FAILURE);
        }
    }

    if (optind>=argc)
    {
	fprintf(stderr, "%s: no files specified!\n", argv[0]);
	exit(EXIT_FAILURE);
    }

    for (;optind<argc;optind++)
    {
        fd=open(argv[optind], O_CREAT|O_WRONLY|O_EXCL, (mode_t)mode);
        if (fd==-1)
        {
            if (verbose)
            {
                fprintf(stderr, "Failed to open %s: ", argv[optind]);
                perror("");
            }
            exit(EXIT_FAILURE);
        }
        close(fd);
    }
    exit(EXIT_SUCCESS);
}

void usage(FILE *out, char *me)
{
    fprintf(out, "Usage: %s [-v] [-m mode] file [[file] [...]]\n", basename(me));
}