Import revision 9131ba637f003fb5894e3f6343a27d6322205f18 from FreeBSD.

Change-Id: I8ee418314ea407ca679bcd1bed85bd4cff435c22

1 files changed, 196 insertions, 0 deletions

diff --git a/check.c b/check.c
new file mode 100644
index 0000000..2431bd3
--- /dev/null
+++ b/check.c
@@ -0,0 +1,196 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (C) 1995, 1996, 1997 Wolfgang Solfrank
+ * Copyright (c) 1995 Martin Husemann
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+#include <sys/cdefs.h>
+#ifndef lint
+__RCSID("$NetBSD: check.c,v 1.14 2006/06/05 16:51:18 christos Exp $");
+static const char rcsid[] =
+  "$FreeBSD$";
+#endif /* not lint */
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#include "ext.h"
+#include "fsutil.h"
+
+int
+checkfilesys(const char *fname)
+{
+	int dosfs;
+	struct bootblock boot;
+	struct fatEntry *fat = NULL;
+	int finish_dosdirsection=0;
+	u_int i;
+	int mod = 0;
+	int ret = 8;
+
+	rdonly = alwaysno;
+	if (!preen)
+		printf("** %s", fname);
+
+	dosfs = open(fname, rdonly ? O_RDONLY : O_RDWR, 0);
+	if (dosfs < 0 && !rdonly) {
+		dosfs = open(fname, O_RDONLY, 0);
+		if (dosfs >= 0)
+			pwarn(" (NO WRITE)\n");
+		else if (!preen)
+			printf("\n");
+		rdonly = 1;
+	} else if (!preen)
+		printf("\n");
+
+	if (dosfs < 0) {
+		perr("Can't open `%s'", fname);
+		printf("\n");
+		return 8;
+	}
+
+	if (readboot(dosfs, &boot) == FSFATAL) {
+		close(dosfs);
+		printf("\n");
+		return 8;
+	}
+
+	if (skipclean && preen && checkdirty(dosfs, &boot)) {
+		printf("%s: ", fname);
+		printf("FILESYSTEM CLEAN; SKIPPING CHECKS\n");
+		ret = 0;
+		goto out;
+	}
+
+	if (!preen)  {
+		if (boot.ValidFat < 0)
+			printf("** Phase 1 - Read and Compare FATs\n");
+		else
+			printf("** Phase 1 - Read FAT\n");
+	}
+
+	mod |= readfat(dosfs, &boot, boot.ValidFat >= 0 ? boot.ValidFat : 0, &fat);
+	if (mod & FSFATAL) {
+		close(dosfs);
+		return 8;
+	}
+
+	if (boot.ValidFat < 0)
+		for (i = 1; i < boot.bpbFATs; i++) {
+			struct fatEntry *currentFat;
+
+			mod |= readfat(dosfs, &boot, i, &currentFat);
+
+			if (mod & FSFATAL)
+				goto out;
+
+			mod |= comparefat(&boot, fat, currentFat, i);
+			free(currentFat);
+			if (mod & FSFATAL)
+				goto out;
+		}
+
+	if (!preen)
+		printf("** Phase 2 - Check Cluster Chains\n");
+
+	mod |= checkfat(&boot, fat);
+	if (mod & FSFATAL)
+		goto out;
+	/* delay writing FATs */
+
+	if (!preen)
+		printf("** Phase 3 - Checking Directories\n");
+
+	mod |= resetDosDirSection(&boot, fat);
+	finish_dosdirsection = 1;
+	if (mod & FSFATAL)
+		goto out;
+	/* delay writing FATs */
+
+	mod |= handleDirTree(dosfs, &boot, fat);
+	if (mod & FSFATAL)
+		goto out;
+
+	if (!preen)
+		printf("** Phase 4 - Checking for Lost Files\n");
+
+	mod |= checklost(dosfs, &boot, fat);
+	if (mod & FSFATAL)
+		goto out;
+
+	/* now write the FATs */
+	if (mod & (FSFATMOD|FSFIXFAT)) {
+		if (ask(1, "Update FATs")) {
+			mod |= writefat(dosfs, &boot, fat, mod & FSFIXFAT);
+			if (mod & FSFATAL)
+				goto out;
+		} else
+			mod |= FSERROR;
+	}
+
+	if (boot.NumBad)
+		pwarn("%d files, %d free (%d clusters), %d bad (%d clusters)\n",
+		      boot.NumFiles,
+		      boot.NumFree * boot.ClusterSize / 1024, boot.NumFree,
+		      boot.NumBad * boot.ClusterSize / 1024, boot.NumBad);
+	else
+		pwarn("%d files, %d free (%d clusters)\n",
+		      boot.NumFiles,
+		      boot.NumFree * boot.ClusterSize / 1024, boot.NumFree);
+
+	if (mod && (mod & FSERROR) == 0) {
+		if (mod & FSDIRTY) {
+			if (ask(1, "MARK FILE SYSTEM CLEAN") == 0)
+				mod &= ~FSDIRTY;
+
+			if (mod & FSDIRTY) {
+				pwarn("MARKING FILE SYSTEM CLEAN\n");
+				mod |= writefat(dosfs, &boot, fat, 1);
+			} else {
+				pwarn("\n***** FILE SYSTEM IS LEFT MARKED AS DIRTY *****\n");
+				mod |= FSERROR; /* file system not clean */
+			}
+		}
+	}
+
+	if (mod & (FSFATAL | FSERROR))
+		goto out;
+
+	ret = 0;
+
+    out:
+	if (finish_dosdirsection)
+		finishDosDirSection();
+	free(fat);
+	close(dosfs);
+
+	if (mod & (FSFATMOD|FSDIRMOD))
+		pwarn("\n***** FILE SYSTEM WAS MODIFIED *****\n");
+
+	return ret;
+}