add directory study

study/linux-travel/MINIX-1.5/1.5/Source/commands/touch.c

@@ -0,0 +1,81 @@
+/* touch - force file creation time to the present time */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <errno.h>
+int no_creat = 0;
+
+main(argc, argv)
+int argc;
+char *argv[];
+{
+  char *path;
+  int i = 1;
+
+  if (argc == 1) usage();
+  while (i < argc) {
+	if (argv[i][0] == '-') {
+		if (argv[i][1] == 'f') {
+			i += 1;
+		} else if (argv[i][1] == 'c') {
+			no_creat = 1;
+			i += 1;
+		} else {
+			usage();
+		}
+	} else {
+		path = argv[i];
+		i += 1;
+		if (doit(path) > 0) {
+			std_err("touch: cannot touch ");
+			std_err(path);
+			std_err("\n");
+		}
+	}
+  }
+  exit(0);
+}
+
+
+doit(name)
+char *name;
+{
+  int fd;
+  long *t, tim;
+  struct stat buf;
+  unsigned short tmp;
+  long tvp[2];
+  extern long time();
+
+  if (!access(name, 0)) {	/* change date if possible */
+	stat(name, &buf);
+	tmp = (buf.st_mode & S_IFREG);
+	if (tmp != S_IFREG) return(1);
+
+	tim = time((long *) 0);
+	tvp[0] = tim;
+	tvp[1] = tim;
+	if (!utime(name, tvp))
+		return(0);
+	else
+		return(1);
+
+  } else {
+	/* File does not exist */
+	if (no_creat == 1)
+		return(0);
+	else if ((fd = creat(name, 0666)) < 0) {
+		return(1);
+	} else {
+		close(fd);
+		return(0);
+	}
+  }
+}
+
+
+usage()
+{
+  std_err("Usage: touch [-c] file...\n");
+  exit(1);
+}