#include <stdio.h>
#include <ctype.h>

main(ac, av)
char *av[];
{
    register int i;
    register FILE *stream;

    for (i = 1; i < ac; ++i) {
	stream = fopen(av[i], "r");
	if (stream) {
	    scat(stream);
	    fclose(stream);
	} else {
	    fprintf(stderr, "Unable to open %s\n", av[i]);
	}
    }
    if (ac == 1)
	scat(stdin);
}

scat(stream)
FILE *stream;
{
    short c;

    while ((c = fgetc(stream)) >= 0) {
	if (isascii(c) && isprint(c)) {
	    reverse(0);
	    putc(c, stdout);
	    continue;
	}
	reverse(1);
	putc((c|0x40)&0x7F, stdout);
	if (c == '\n')
	    putc(c, stdout);
    }
    reverse(0);
}

reverse(mode)
{
    static char xmode;

    if (mode) {
	if (!xmode) {
	    putc(0x9b, stdout);
	    putc(0x37, stdout);
	    putc('m', stdout);
	}
    } else {
	if (xmode) {
	    putc(0x9b, stdout);
	    putc(0x30, stdout);
	    putc('m', stdout);
	}
    }
    xmode = mode;
}