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	tee.c - 9base - revived minimalist port of Plan 9 userland to Unix
	git clone git://git.suckless.org/9base
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	---
	tee.c (1062B)
	---
	1 /*
	2 * tee-- pipe fitting
	3 */
	4
	5 #include <u.h>
	6 #include <libc.h>
	7
	8 int uflag;
	9 int aflag;
	10 int openf[100];
	11
	12 char in[8192];
	13
	14 int intignore(void, char);
	15
	16 void
	17 main(int argc, char **argv)
	18 {
	19 int i;
	20 int r, n;
	21
	22 ARGBEGIN {
	23 case 'a':
	24 aflag++;
	25 break;
	26
	27 case 'i':
	28 atnotify(intignore, 1);
	29 break;
	30
	31 case 'u':
	32 uflag++;
	33 /* uflag is ignored and undocumented; it's a relic from …
	34 break;
	35
	36 default:
	37 fprint(2, "usage: tee [-ai] [file ...]\n");
	38 exits("usage");
	39 } ARGEND
	40
	41 USED(argc);
	42 n = 0;
	43 while(*argv) {
	44 if(aflag) {
	45 openf[n] = open(argv[0], OWRITE);
	46 if(openf[n] < 0)
	47 openf[n] = create(argv[0], OWRITE, 0666);
	48 seek(openf[n], 0L, 2);
	49 } else
	50 openf[n] = create(argv[0], OWRITE, 0666);
	51 if(openf[n] < 0) {
	52 fprint(2, "tee: cannot open %s: %r\n", argv[0]);
	53 } else
	54 n++;
	55 argv++;
	56 }
	57 openf[n++] = 1;
	58
	59 for(;;) {
	60 r = read(0, in, sizeof in);
	61 if(r <= 0)
	62 exits(nil);
	63 for(i=0; i<n; i++)
	64 write(openf[i], in, r);
	65 }
	66 }
	67
	68 int
	69 intignore(void a, char msg)
	70 {
	71 USED(a);
	72 if(strcmp(msg, "interrupt") == 0)
	73 return 1;
	74 return 0;
	75 }