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| author | Jonathan Cameron <jic23@cam.ac.uk> | 2011-04-19 12:43:45 +0100 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2011-05-19 16:55:28 +0930 |
| commit | d0f1fed29e6e73d9d17f4c91a5896a4ce3938d45 (patch) | |
| tree | d44eae96f46e728cb9d87bca1b2494022bf590a9 | |
| parent | 6845756b29e4c4e7db41e2d75cafa9d091bc1c07 (diff) | |
| download | linux-d0f1fed29e6e73d9d17f4c91a5896a4ce3938d45.tar.bz2 | |
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: Rusty Russell <rusty@rustcorp.com.au>
| -rw-r--r-- | include/linux/string.h | 1 | ||||
| -rw-r--r-- | lib/string.c | 29 |
2 files changed, 30 insertions, 0 deletions
diff --git a/include/linux/string.h b/include/linux/string.h index a716ee2a8adb..a176db2f2c85 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 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 f71bead1be3e..01fad9b203e1 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 |