add directory study

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

@@ -0,0 +1,152 @@
+/* rm - remove files			Author: Adri Koppes */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/dir.h>
+
+int errors = 0;
+int fflag = 0;
+int iflag = 0;
+int rflag = 0;
+int exstatus;
+
+main(argc, argv)
+int argc;
+char *argv[];
+{
+  char *opt;
+
+  if (argc < 2) usage();
+  *++argv;
+  --argc;
+  while (**argv == '-') {
+	opt = *argv;
+	while (*++opt != '\0') switch (*opt) {
+		    case 'f':	fflag++;	break;
+		    case 'i':	iflag++;	break;
+		    case 'r':	rflag++;	break;
+		    default:
+			std_err("rm: unknown option\n");
+			usage();
+			break;
+		}
+	argc--;
+	*++argv;
+  }
+  if (argc < 1) usage();
+  while (argc--) remove(*argv++);
+  exstatus = (errors == 0 ? 0 : 1);
+  if (fflag) exstatus = 0;
+  exit(exstatus);
+}
+
+usage()
+{
+  std_err("Usage: rm [-fir] file\n");
+  exit(1);
+}
+
+remove(name)
+char *name;
+{
+  struct stat s;
+  struct direct d;
+  char rname[128], *strcpy(), *strcat();
+  int fd;
+
+  if (stat(name, &s)) {
+	if (!fflag) stderr3("rm: ", name, " non-existent\n");
+	errors++;
+	return;
+  }
+  if (iflag) {
+	stderr3("rm: remove ", name, "? ");
+	if (!confirm()) return;
+  }
+  if ((s.st_mode & S_IFMT) == S_IFDIR) {
+	if (rflag) {
+		if ((fd = open(name, 0)) < 0) {
+			if (!fflag) stderr3("rm: can't open ", name, "\n");
+			errors++;
+			return;
+		}
+		while (read(fd, (char *) &d, sizeof(struct direct)) > 0) {
+			if (d.d_ino && strcmp("..", d.d_name) && strcmp(".", d.d_name)) {
+				strcpy(rname, name);
+				strcat(rname, "/");
+				strncat(rname, d.d_name, DIRSIZ);
+				remove(rname);
+			}
+		}
+		close(fd);
+		rem_dir(name);
+	} else {
+		if (!fflag) stderr3("rm: ", name, " is a directory\n");
+		errors++;
+		return;
+	}
+  } else {
+	if (access(name, 2) && !fflag) {
+		stderr3("rm: remove ", name, " (mode = ");
+		octal(s.st_mode & 0777);
+		std_err(") ? ");
+		if (!confirm()) return;
+	}
+	if (unlink(name)) {
+		if (!fflag) stderr3("rm: ", name, " not removed\n");
+		errors++;
+	}
+  }
+}
+
+rem_dir(name)
+char *name;
+{
+  int status;
+
+  switch (fork()) {
+      case -1:
+	std_err("rm: can't fork\n");
+	errors++;
+	return;
+      case 0:
+	execl("/bin/rmdir", "rmdir", name, (char *) 0);
+	execl("/usr/bin/rmdir", "rmdir", name, (char *) 0);
+	std_err("rm: can't exec rmdir\n");
+	exit(1);
+      default:
+	wait(&status);
+	errors += status;
+  }
+}
+
+confirm()
+{
+  char c, t;
+  read(0, &c, 1);
+  t = c;
+  do
+	read(0, &t, 1);
+  while (t != '\n' && t != -1);
+  return(c == 'y' || c == 'Y');
+}
+
+octal(num)
+unsigned int num;
+{
+  char a[4];
+
+  a[0] = (((num >> 6) & 7) + '0');
+  a[1] = (((num >> 3) & 7) + '0');
+  a[2] = ((num & 7) + '0');
+  a[3] = 0;
+  std_err(a);
+}
+
+stderr3(s1, s2, s3)
+char *s1, *s2, *s3;
+{
+  std_err(s1);
+  std_err(s2);
+  std_err(s3);
+}