From 31a4e7f0de31b545ff8d854fe29791b1eefcd1f9 Mon Sep 17 00:00:00 2001
From: Sebastian Capella <sebastian.capella@linaro.org>
Date: Thu, 22 Oct 2015 09:03:54 +1100
Subject: [PATCH] mm/util.c: add kstrimdup()

kstrimdup() creates a whitespace-trimmed duplicate of the passed in
null-terminated string.  This is useful for strings coming from sysfs that
often include trailing whitespace due to user input.

Thanks to Joe Perches for this implementation.

Signed-off-by: Sebastian Capella <sebastian.capella@linaro.org>
Cc: Joe Perches <joe@perches.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 include/linux/string.h |  1 +
 mm/util.c              | 30 ++++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/include/linux/string.h b/include/linux/string.h
index 9ef7795e65e4..cc77d6477fc2 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -121,6 +121,7 @@ extern void kfree_const(const void *x);
 extern char *kstrdup(const char *s, gfp_t gfp);
 extern const char *kstrdup_const(const char *s, gfp_t gfp);
 extern char *kstrndup(const char *s, size_t len, gfp_t gfp);
+extern char *kstrimdup(const char *s, gfp_t gfp);
 extern void *kmemdup(const void *src, size_t len, gfp_t gfp);
 
 extern char **argv_split(gfp_t gfp, const char *str, int *argcp);
diff --git a/mm/util.c b/mm/util.c
index 902b65a43899..55012d786a35 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -3,6 +3,7 @@
 #include <linux/string.h>
 #include <linux/compiler.h>
 #include <linux/export.h>
+#include <linux/ctype.h>
 #include <linux/err.h>
 #include <linux/sched.h>
 #include <linux/security.h>
@@ -99,6 +100,35 @@ char *kstrndup(const char *s, size_t max, gfp_t gfp)
 }
 EXPORT_SYMBOL(kstrndup);
 
+/**
+ * kstrimdup - Trim and copy a %NUL terminated string.
+ * @s: the string to trim and duplicate
+ * @gfp: the GFP mask used in the kmalloc() call when allocating memory
+ *
+ * Returns an address, which the caller must kfree, containing
+ * a duplicate of the passed string with leading and/or trailing
+ * whitespace (as defined by isspace) removed.
+ */
+char *kstrimdup(const char *s, gfp_t gfp)
+{
+	char *buf;
+	char *begin = skip_spaces(s);
+	size_t len = strlen(begin);
+
+	while (len && isspace(begin[len - 1]))
+		len--;
+
+	buf = kmalloc_track_caller(len + 1, gfp);
+	if (!buf)
+		return NULL;
+
+	memcpy(buf, begin, len);
+	buf[len] = '\0';
+
+	return buf;
+}
+EXPORT_SYMBOL(kstrimdup);
+
 /**
  * kmemdup - duplicate region of memory
  *
-- 
2.39.5