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	touch.c - 9base - revived minimalist port of Plan 9 userland to Unix
	git clone git://git.suckless.org/9base
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	---
	touch.c (1017B)
	---
	1 #include <u.h>
	2 #include <libc.h>
	3
	4 int touch(int, char *);
	5 ulong now;
	6 int tflag;
	7
	8 void
	9 usage(void)
	10 {
	11 fprint(2, "usage: touch [-c] [-t time] files\n");
	12 exits("usage");
	13 }
	14
	15 void
	16 main(int argc, char **argv)
	17 {
	18 int nocreate = 0;
	19 int status = 0;
	20
	21 now = time(0);
	22 ARGBEGIN{
	23 case 't':
	24 tflag = 1;
	25 now = strtoul(EARGF(usage()), 0, 0);
	26 break;
	27 case 'c':
	28 nocreate = 1;
	29 break;
	30 default:
	31 usage();
	32 }ARGEND
	33
	34 if(!*argv)
	35 usage();
	36 while(*argv)
	37 status += touch(nocreate, *argv++);
	38 if(status)
	39 exits("touch");
	40 exits(0);
	41 }
	42
	43 int
	44 touch(int nocreate, char *name)
	45 {
	46 Dir stbuff;
	47 int fd;
	48
	49 nulldir(&stbuff);
	50 stbuff.mtime = now;
	51 if(dirwstat(name, &stbuff) >= 0)
	52 return 0;
	53 if(nocreate){
	54 fprint(2, "touch: %s: cannot wstat: %r\n", name);
	55 return 1;
	56 }
	57 if((fd = create(name, OREAD, 0666)) < 0) {
	58 fprint(2, "touch: %s: cannot create: %r\n", name);
	59 return 1;
	60 }
	61 if(tflag && dirfwstat(fd, &stbuff) < 0){
	62 fprint(2, "touch: %s: cannot wstat: %r\n", name);
	63 close(fd);
	64 return 1;
	65 }
	66 close(fd);
	67 return 0;
	68 }