[PATCH v2] btrfs-progs: move arg_strtou64 to a separate file for library

[David Sterba <dsterba@suse.cz>]

Linking with libbtrfs fails because arg_strtou64 is not defined and we
cannot just add utils.o to library objects because it's not
library-clean.

Reported-by: Arvin Schnell <aschnell@suse.com>
Reported-by: Anton Farygin <rider@altlinux.org>
Signed-off-by: David Sterba <dsterba@suse.cz>
---

v2: (thanks to Hugo)
- added missing line from comment
- fixed typo
- reformated comment paragraphs

 Makefile    |  5 +++--
 utils-lib.c | 42 ++++++++++++++++++++++++++++++++++++++++++
 utils.c     | 33 ---------------------------------
 3 files changed, 45 insertions(+), 35 deletions(-)
 create mode 100644 utils-lib.c

diff --git a/Makefile b/Makefile
index 51d53fadf5af..76565e8b2307 100644
--- a/Makefile
+++ b/Makefile
@@ -9,14 +9,15 @@ CFLAGS = -g -O1 -fno-strict-aliasing
 objects = ctree.o disk-io.o radix-tree.o extent-tree.o print-tree.o \
 	  root-tree.o dir-item.o file-item.o inode-item.o inode-map.o \
 	  extent-cache.o extent_io.o volumes.o utils.o repair.o \
-	  qgroup.o raid6.o free-space-cache.o list_sort.o props.o
+	  qgroup.o raid6.o free-space-cache.o list_sort.o props.o \
+	  utils-lib.o
 cmds_objects = cmds-subvolume.o cmds-filesystem.o cmds-device.o cmds-scrub.o \
 	       cmds-inspect.o cmds-balance.o cmds-send.o cmds-receive.o \
 	       cmds-quota.o cmds-qgroup.o cmds-replace.o cmds-check.o \
 	       cmds-restore.o cmds-rescue.o chunk-recover.o super-recover.o \
 	       cmds-property.o
 libbtrfs_objects = send-stream.o send-utils.o rbtree.o btrfs-list.o crc32c.o \
-		   uuid-tree.o
+		   uuid-tree.o utils-lib.o
 libbtrfs_headers = send-stream.h send-utils.h send.h rbtree.h btrfs-list.h \
 	       crc32c.h list.h kerncompat.h radix-tree.h extent-cache.h \
 	       extent_io.h ioctl.h ctree.h btrfsck.h
diff --git a/utils-lib.c b/utils-lib.c
new file mode 100644
index 000000000000..9d53c6e5c710
--- /dev/null
+++ b/utils-lib.c
@@ -0,0 +1,42 @@
+#define _GNU_SOURCE
+
+#include "kerncompat.h"
+#include <unistd.h>
+#include <stdlib.h>
+#include <limits.h>
+
+#if BTRFS_FLAT_INCLUDES
+#else
+#endif /* BTRFS_FLAT_INCLUDES */
+
+/*
+ * This function should be only used when parsing command arg, it won't return
+ * error to its caller and rather exit directly just like usage().
+ */
+u64 arg_strtou64(const char *str)
+{
+	u64 value;
+	char *ptr_parse_end = NULL;
+
+	value = strtoull(str, &ptr_parse_end, 0);
+	if (ptr_parse_end && *ptr_parse_end != '\0') {
+		fprintf(stderr, "ERROR: %s is not a valid numeric value.\n",
+			str);
+		exit(1);
+	}
+
+	/*
+	 * if we pass a negative number to strtoull, it will return an
+	 * unexpected number to us, so let's do the check ourselves.
+	 */
+	if (str[0] == '-') {
+		fprintf(stderr, "ERROR: %s: negative value is invalid.\n",
+			str);
+		exit(1);
+	}
+	if (value == ULLONG_MAX) {
+		fprintf(stderr, "ERROR: %s is too large.\n", str);
+		exit(1);
+	}
+	return value;
+}
diff --git a/utils.c b/utils.c
index 29953d9dd2a9..e130849c7bb5 100644
--- a/utils.c
+++ b/utils.c
@@ -1538,39 +1538,6 @@ scan_again:
 	return 0;
 }
 
-/*
- * This function should be only used when parsing
- * command arg, it won't return error to it's
- * caller and rather exit directly just like usage().
- */
-u64 arg_strtou64(const char *str)
-{
-	u64 value;
-	char *ptr_parse_end = NULL;
-
-	value = strtoull(str, &ptr_parse_end, 0);
-	if (ptr_parse_end && *ptr_parse_end != '\0') {
-		fprintf(stderr, "ERROR: %s is not a valid numeric value.\n",
-			str);
-		exit(1);
-	}
-	/*
-	 * if we pass a negative number to strtoull,
-	 * it will return an unexpected number to us,
-	 * so let's do the check ourselves.
-	 */
-	if (str[0] == '-') {
-		fprintf(stderr, "ERROR: %s: negative value is invalid.\n",
-			str);
-		exit(1);
-	}
-	if (value == ULLONG_MAX) {
-		fprintf(stderr, "ERROR: %s is too large.\n", str);
-		exit(1);
-	}
-	return value;
-}
-
 u64 parse_size(char *s)
 {
 	int i;
-- 
1.9.0