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Add a strtobool function matching semantics of existing in kernel equivalents

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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>
This commit is contained in:
Jonathan Cameron 2011-04-19 12:43:45 +01:00 committed by Rusty Russell
parent 6845756b29
commit d0f1fed29e
2 changed files with 30 additions and 0 deletions
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1
include/linux/string.h
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@ -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);

29
lib/string.c
View File

@ -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