diff options
| author | Jonathan Cameron <jic23@cam.ac.uk> | 2011-04-19 12:43:45 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-04-25 16:04:51 -0700 |
| commit | ad58671cf32c74a8d6e8f51e63e9cf4e7a73bf1e (patch) | |
| tree | 6a117bb8bc2f443b47ae376074b842bcc5688014 /lib | |
| parent | 85723943537bf6a73bdf1140b2088fbe0c17c3c2 (diff) | |
Add a strtobool function matching semantics of existing in kernel equivalents
This is a rename of the usr_strtobool proposal, which was a renamed,
relocated and fixed version of previous kstrtobool RFC
Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/string.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/lib/string.c b/lib/string.c index f71bead1be3..01fad9b203e 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); +/** + * 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 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(strtobool); + #ifndef __HAVE_ARCH_MEMSET /** * memset - Fill a region of memory with the given value |