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-rw-r--r--include/linux/string.h2
-rw-r--r--lib/string.c27
2 files changed, 29 insertions, 0 deletions
diff --git a/include/linux/string.h b/include/linux/string.h
index c5d3fcad7b57..efdc44593b52 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -109,5 +109,7 @@ extern void *kmemdup(const void *src, size_t len, gfp_t gfp);
extern char **argv_split(gfp_t gfp, const char *str, int *argcp);
extern void argv_free(char **argv);
+extern bool sysfs_streq(const char *s1, const char *s2);
+
#endif
#endif /* _LINUX_STRING_H_ */
diff --git a/lib/string.c b/lib/string.c
index 5efafed3d6b6..b19b87af65a3 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -493,6 +493,33 @@ char *strsep(char **s, const char *ct)
EXPORT_SYMBOL(strsep);
#endif
+/**
+ * sysfs_streq - return true if strings are equal, modulo trailing newline
+ * @s1: one string
+ * @s2: another string
+ *
+ * This routine returns true iff two strings are equal, treating both
+ * NUL and newline-then-NUL as equivalent string terminations. It's
+ * geared for use with sysfs input strings, which generally terminate
+ * with newlines but are compared against values without newlines.
+ */
+bool sysfs_streq(const char *s1, const char *s2)
+{
+ while (*s1 && *s1 == *s2) {
+ s1++;
+ s2++;
+ }
+
+ if (*s1 == *s2)
+ return true;
+ if (!*s1 && *s2 == '\n' && !s2[1])
+ return true;
+ if (*s1 == '\n' && !s1[1] && !*s2)
+ return true;
+ return false;
+}
+EXPORT_SYMBOL(sysfs_streq);
+
#ifndef __HAVE_ARCH_MEMSET
/**
* memset - Fill a region of memory with the given value