From b7f006eecd456214d36db9e901d979d5f998e813 Mon Sep 17 00:00:00 2001
From: Andre Noll <maan@systemlinux.org>
Date: Thu, 5 Jun 2008 21:44:42 +0200
Subject: [PATCH] Fix fsck error codes.

---
 error.h |  1 +
 fsck.c  | 43 +++++++++++++++++++++++++++++--------------
 2 files changed, 30 insertions(+), 14 deletions(-)

diff --git a/error.h b/error.h
index 5652e9a..f28c39d 100644
--- a/error.h
+++ b/error.h
@@ -1,3 +1,4 @@
+#define FSCK_ERROR_BIT 29
 /**
  * This bit indicates whether a number is considered a system error number
  * If yes, the system errno is just the result of clearing this bit from
diff --git a/fsck.c b/fsck.c
index d800017..ef068d3 100644
--- a/fsck.c
+++ b/fsck.c
@@ -40,12 +40,28 @@
 
 static struct fsck_args_info conf;
 
-enum fsck_errors {
-	E_RANGE_VIOLATION,
-	E_INVALID_OBJECT,
-	E_NOT_A_REGULAR_FILE,
-	E_FSCK_SYNTAX,
+#define FSCK_ERRORS \
+	FSCK_ERROR(RANGE_VIOLATION, "range violation detected, very bad"), \
+	FSCK_ERROR(NOT_A_REGULAR_FILE, "not a regular file"), \
+	FSCK_ERROR(SYNTAX, "fsck syntax error"),
+
+#define FSCK_ERROR(num, txt) E_FSCK_ ## num
+enum {
+	FSCK_DUMMY = (1 << FSCK_ERROR_BIT) - 1,
+	FSCK_ERRORS
 };
+#undef FSCK_ERROR
+#define FSCK_ERROR(num, txt) txt
+const char const *fsck_errors[] = {
+	FSCK_ERRORS
+};
+
+static const char *fsck_strerror(int num)
+{
+	if (num & (1 << FSCK_ERROR_BIT))
+		return fsck_errors[num & ((1 << FSCK_ERROR_BIT) - 1)];
+	return osl_strerror(num);
+}
 
 __printf_2_3 void para_log(int ll, const char* fmt,...)
 {
@@ -308,7 +324,7 @@ static int check_range(struct osl_table *t, uint32_t row_num, uint32_t col_num)
 	if (obj_start < map_start || obj_start + obj.size > map_start + col->data_map.size) {
 		CRIT_LOG("range violation in row %u, col %u\n", row_num,
 			col_num);
-		return -E_RANGE_VIOLATION;
+		return -E_FSCK_RANGE_VIOLATION;
 	}
 	DEBUG_LOG("col %u: ok\n", col_num);
 	return 1;
@@ -336,10 +352,10 @@ static int check_index_ranges(struct osl_table *t)
 				continue;
 			ret = check_range(t, i, j);
 			if (ret < 0) {
-				if (ret != -E_INVALID_OBJECT &&
-						ret != -E_RANGE_VIOLATION)
+				if (ret != -E_OSL_INVALID_OBJECT &&
+						ret != -E_FSCK_RANGE_VIOLATION)
 					goto err;
-				if (ret == -E_INVALID_OBJECT) {
+				if (ret == -E_OSL_INVALID_OBJECT) {
 					CRIT_LOG("row %d, col %d maps to an "
 						"invalid object\n", i, j);
 				}
@@ -450,7 +466,7 @@ static int check_for_invalid_objects(struct osl_table *t, uint32_t **lost_bytes)
 				loss[i] -= obj.size + 1; /* add one for header byte */
 				continue;
 			}
-			if (ret != -E_INVALID_OBJECT)
+			if (ret != -E_OSL_INVALID_OBJECT)
 				goto err;
 			CRIT_LOG("row %d, col %d points to an invalid "
 				"mapped object, bad\n", j, i);
@@ -544,7 +560,7 @@ static int prune_objects(struct osl_table *t, uint32_t *lost_bytes)
 		ret = osl_rename(new_col_filenames[i], col_filenames[i]);
 		if (ret < 0) { /* we're kinda screwed here */
 			CRIT_LOG("rename of col %i failed: %s\n", i,
-				strerror(errno));
+				osl_strerror(errno));
 			goto out_free;
 		}
 	}
@@ -623,7 +639,7 @@ out:
 	free(path);
 	if (ret < 0)
 		return ret;
-	ret = -E_NOT_A_REGULAR_FILE;
+	ret = -E_FSCK_NOT_A_REGULAR_FILE;
 	if (!(S_IFREG & statbuf.st_mode))
 		return ret;
 	return 1;
@@ -1171,11 +1187,10 @@ int main(int argc, char **argv)
 	}
 out:
 	if (ret < 0) {
-		/* FIXME: osl_strerror() is BAD!!! */
 		ERROR_LOG("%s%s: %s\n",
 			base_dir? "base_dir: " : "",
 			base_dir? base_dir : "",
-			osl_strerror(-ret)
+			fsck_strerror(-ret)
 		);
 		if (conf.loglevel_arg > 1)
 			EMERG_LOG("re-run with \"--loglevel %d\" to increase verbosity\n",
-- 
2.39.2