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#include	<u.h>
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#include 	<libc.h>
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#include	<bio.h>
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Biobuf	*fin;
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Biobuf	fout;
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#define	MINSPAN		6		/* Min characters in string (default) */
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#define BUFSIZE		70
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void stringit(char *);
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int isprint(Rune);
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static int minspan = MINSPAN;
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static void
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usage(void)
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{
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	fprint(2, "usage: %s [-m min] [file...]\n", argv0);
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	exits("usage");
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}
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void
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main(int argc, char **argv)
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{
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	int i;
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	ARGBEGIN{
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	case 'm':
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		minspan = atoi(EARGF(usage()));
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		break;
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	default:
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		usage();
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		break;
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	}ARGEND
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	Binit(&fout, 1, OWRITE);
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	if(argc < 1) {
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		stringit("/fd/0");
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		exits(0);
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	}
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	for(i = 0; i < argc; i++) {
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		if(argc > 2)
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			print("%s:\n", argv[i]);
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		stringit(argv[i]);
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	}
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	exits(0);
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}
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void
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stringit(char *str)
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{
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	long posn, start;
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	int cnt = 0;
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	long c;
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	Rune buf[BUFSIZE];
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	if ((fin = Bopen(str, OREAD)) == 0) {
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		perror("open");
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		return;
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	}
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	start = 0;
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	posn = Boffset(fin);
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	while((c = Bgetrune(fin)) >= 0) {
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		if(isprint(c)) {
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			if(start == 0)
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				start = posn;
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			buf[cnt++] = c;
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			if(cnt == BUFSIZE-1) {
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				buf[cnt] = 0;
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				Bprint(&fout, "%8ld: %S ...\n", start, buf);
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				start = 0;
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				cnt = 0;
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			}
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		} else {
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			 if(cnt >= minspan) {
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				buf[cnt] = 0;
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				Bprint(&fout, "%8ld: %S\n", start, buf);
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			}
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			start = 0;
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			cnt = 0;
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		}
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		posn = Boffset(fin);
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	}
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	if(cnt >= minspan){
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		buf[cnt] = 0;
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		Bprint(&fout, "%8ld: %S\n", start, buf);
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	}
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	Bterm(fin);
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}
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int
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isprint(Rune r)
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{
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	if (r != Runeerror)
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	if ((r >= ' ' && r < 0x7F) || r > 0xA0)
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		return 1;
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	return 0;
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}