sys/src/cmd/touch.c

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