linux-kernel - [PATCH 1/3] Add a usr_strtobool function matching semantics of existing in kernel equivalents

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Message-Id: <1300973025-32497-2-git-send-email-jic23@cam.ac.uk>
Date:	Thu, 24 Mar 2011 13:23:43 +0000
From:	Jonathan Cameron <jic23@....ac.uk>
To:	linux-kernel@...r.kernel.org
Cc:	greg@...ah.com, rusty@...tcorp.com.au, adobriyan@...il.com,
	Jonathan Cameron <jic23@....ac.uk>
Subject: [PATCH 1/3] Add a usr_strtobool function matching semantics of existing in kernel equivalents

This is a renamed and relocated fixed version of previous kstrtobool RFC

Signed-off-by: Jonathan Cameron <jic23@....ac.uk>
---
 include/linux/string.h |    1 +
 lib/string.c           |   29 +++++++++++++++++++++++++++++
 2 files changed, 30 insertions(+), 0 deletions(-)

diff --git a/include/linux/string.h b/include/linux/string.h
index a716ee2..1977cc0 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -123,6 +123,7 @@ 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);
+extern int usr_strtobool(const char *s, bool *res);
 
 #ifdef CONFIG_BINARY_PRINTF
 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args);
diff --git a/lib/string.c b/lib/string.c
index f71bead..121bd65 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -535,6 +535,35 @@ bool sysfs_streq(const char *s1, const char *s2)
 }
 EXPORT_SYMBOL(sysfs_streq);
 
+/**
+ * usr_strtobool - convert common user inputs into boolean values
+ * @s: input string
+ * @res: result
+ *
+ * This routine returns 0 iff the first character is one of 'Yy1Nn0'.
+ * Otherwise it will return -EINVAL.  Value pointed to by res is
+ * updated upon finding a match.
+ */
+int usr_strtobool(const char *s, bool *res)
+{
+	switch (s[0]) {
+	case 'y':
+	case 'Y':
+	case '1':
+		*res = true;
+		break;
+	case 'n':
+	case 'N':
+	case '0':
+		*res = false;
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+EXPORT_SYMBOL(usr_strtobool);
+
 #ifndef __HAVE_ARCH_MEMSET
 /**
  * memset - Fill a region of memory with the given value
-- 
1.7.3.4

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