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Implement the kstrtobool() and kstrtobool_from_user() functions

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in the LinuxKPI.

Submitted by:	Johannes Lundberg <johalun0@gmail.com>
MFC after:	1 week
Sponsored by:	Mellanox Technologies
Sponsored by:	Limelight Networks
This commit is contained in:
Hans Petter Selasky 2018-06-11 16:26:33 +00:00
parent 2ef5e36473
commit 35555d474b
1 changed files with 42 additions and 0 deletions
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42
sys/compat/linuxkpi/common/include/linux/kernel.h
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@ -50,7 +50,9 @@
#include <linux/types.h>
#include <linux/jiffies.h>
#include <linux/log2.h>
#include <asm/byteorder.h>
#include <asm/uaccess.h>
#include <machine/stdarg.h>
@ -372,6 +374,46 @@ kstrtou32(const char *cp, unsigned int base, u32 *res)
return (0);
}
static inline int
kstrtobool(const char *s, bool *res)
{
int len;
if (s == NULL || (len = strlen(s)) == 0 || res == NULL)
return (-EINVAL);
/* skip newline character, if any */
if (s[len - 1] == '\n')
len--;
if (len == 1 && strchr("yY1", s[0]) != NULL)
*res = true;
else if (len == 1 && strchr("nN0", s[0]) != NULL)
*res = false;
else if (strncasecmp("on", s, len) == 0)
*res = true;
else if (strncasecmp("off", s, len) == 0)
*res = false;
else
return (-EINVAL);
return (0);
}
static inline int
kstrtobool_from_user(const char __user *s, size_t count, bool *res)
{
char buf[8] = {};
if (count > (sizeof(buf) - 1))
count = (sizeof(buf) - 1);
if (copy_from_user(buf, s, count))
return (-EFAULT);
return (kstrtobool(buf, res));
}
#define min(x, y) ((x) < (y) ? (x) : (y))
#define max(x, y) ((x) > (y) ? (x) : (y))