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Commit ad58671c authored by Jonathan Cameron's avatar Jonathan Cameron Committed by Greg Kroah-Hartman
Browse files

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: default avatarJonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 85723943

include/linux/string.h

+1 −0
Original line number Diff line number Diff line
@@ -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);

lib/string.c

+29 −0
Original line number Diff line number Diff line
@@ -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