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Fix libmount build under uClibc

See https://bugs.gentoo.org/show_bug.cgi?id=406303
http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/sys-apps/util-linux/files/util-linux-2.21.1-no-printf-alloc.patch?revision=1.2
ported to util-linux-2.23.2

--- a/configure.ac	2013-07-30 03:39:26.188738061 -0500
+++ b/configure.ac	2013-09-05 15:31:11.460864363 -0500
@@ -755,7 +755,6 @@
 UL_BUILD_INIT([libmount])
 UL_REQUIRES_LINUX([libmount])
 UL_REQUIRES_BUILD([libmount], [libblkid])
-UL_REQUIRES_HAVE([libmount], [scanf_alloc_modifier], [scanf string alloc modifier])
 AM_CONDITIONAL(BUILD_LIBMOUNT, test "x$build_libmount" = xyes)
 AM_CONDITIONAL(BUILD_LIBMOUNT_TESTS, test "x$build_libmount" = xyes -a "x$enable_static" = xyes)
 
--- a/libmount/src/tab_parse.c	2013-07-30 03:39:26.218738358 -0500
+++ b/libmount/src/tab_parse.c	2013-09-05 15:31:11.460864363 -0500
@@ -22,6 +22,10 @@
 #include "pathnames.h"
 #include "strutils.h"
 
+#ifndef HAVE_SCANF_MS_MODIFIER
+# define UL_SCNsA "%s"
+#endif
+
 static inline char *skip_spaces(char *s)
 {
 	assert(s);
@@ -61,16 +65,31 @@
 	int rc, n = 0, xrc;
 	char *src = NULL, *fstype = NULL, *optstr = NULL;
 
+#ifndef HAVE_SCANF_MS_MODIFIER
+	size_t len = strlen(s) + 1;
+	src = malloc(len);
+	fstype = malloc(len);
+	fs->target = malloc(len);
+	optstr = malloc(len);
+#endif
+
 	rc = sscanf(s,	UL_SCNsA" "	/* (1) source */
 			UL_SCNsA" "	/* (2) target */
 			UL_SCNsA" "	/* (3) FS type */
 			UL_SCNsA" "	/* (4) options */
 			"%n",		/* byte count */
 
+#ifdef HAVE_SCANF_MS_MODIFIER
 			&src,
 			&fs->target,
 			&fstype,
 			&optstr,
+#else
+			src,
+			fs->target,
+			fstype,
+			optstr,
+#endif
 			&n);
 	xrc = rc;
 
@@ -136,6 +155,16 @@
 	unsigned int maj, min;
 	char *fstype = NULL, *src = NULL, *p;
 
+#ifndef HAVE_SCANF_MS_MODIFIER
+	size_t len = strlen(s) + 1;
+	fs->root = malloc(len);
+	fs->target = malloc(len);
+	fs->vfs_optstr = malloc(len);
+	fs->fs_optstr = malloc(len);
+	fstype = malloc(len);
+	src = malloc(len);
+#endif
+
 	rc = sscanf(s,	"%u "		/* (1) id */
 			"%u "		/* (2) parent */
 			"%u:%u "	/* (3) maj:min */
@@ -147,9 +176,15 @@
 			&fs->id,
 			&fs->parent,
 			&maj, &min,
+#ifdef HAVE_SCANF_MS_MODIFIER
 			&fs->root,
 			&fs->target,
 			&fs->vfs_optstr,
+#else
+			fs->root,
+			fs->target,
+			fs->vfs_optstr,
+#endif
 			&end);
 
 	if (rc >= 7 && end > 0)
@@ -169,9 +204,15 @@
 			UL_SCNsA" "	/* (9) source */
 			UL_SCNsA,	/* (10) fs options (fs specific) */
 
+#ifdef HAVE_SCANF_MS_MODIFIER
 			&fstype,
 			&src,
 			&fs->fs_optstr);
+#else
+			fstype,
+			src,
+			fs->fs_optstr);
+#endif
 
 	if (rc >= 10) {
 		fs->flags |= MNT_FS_KERNEL;
@@ -279,14 +320,25 @@
 	int rc;
 	char *src = NULL;
 
+#ifndef HAVE_SCANF_MS_MODIFIER
+	size_t len = strlen(s) + 1;
+	src = malloc(len);
+	fs->swaptype = malloc(len);
+#endif
+
 	rc = sscanf(s,	UL_SCNsA" "	/* (1) source */
 			UL_SCNsA" "	/* (2) type */
 			"%jd"		/* (3) size */
 			"%jd"		/* (4) used */
 			"%d",		/* priority */
 
+#ifdef HAVE_SCANF_MS_MODIFIER
 			&src,
 			&fs->swaptype,
+#else
+			src,
+			fs->swaptype,
+#endif
 			&fsz,
 			&usz,
 			&fs->priority);