[PATCH 1/3] Add a kstrtobool function matching semantics of existing in kernel equivalents.

[Jonathan Cameron <jic23@cam.ac.uk>]

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
---
 include/linux/kernel.h |    1 +
 lib/kstrtox.c          |   18 ++++++++++++++++++
 2 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 00cec4d..0babad3 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -247,6 +247,7 @@ int __must_check kstrtou16(const char *s, unsigned int base, u16 *res);
 int __must_check kstrtos16(const char *s, unsigned int base, s16 *res);
 int __must_check kstrtou8(const char *s, unsigned int base, u8 *res);
 int __must_check kstrtos8(const char *s, unsigned int base, s8 *res);
+int __must_check kstrtobool(const char *s, bool *res);
 
 extern unsigned long simple_strtoul(const char *,char **,unsigned int);
 extern long simple_strtol(const char *,char **,unsigned int);
diff --git a/lib/kstrtox.c b/lib/kstrtox.c
index 05672e8..84cf08f 100644
--- a/lib/kstrtox.c
+++ b/lib/kstrtox.c
@@ -225,4 +225,21 @@ int kstrtos8(const char *s, unsigned int base, s8 *res)
 	return 0;
 }
 EXPORT_SYMBOL(kstrtos8);
+
+int kstrtobool(const char *s, bool *res)
+{
+	switch (s[0]) {
+	case 'y':
+	case 'Y':
+	case '1':
+		*res = true;
+	case 'n':
+	case 'N':
+	case '0':
+		*res = false;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+EXPORT_SYMBOL(kstrtobool);
-- 
1.7.3.4