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LinuxKPI: add kstrtou8() and kstrtou8_from_user() to kernel.h

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Analogous to the other sized version of kstrto[u]<type>() and
kstrtobool_from_user() add the "u8" versions needed by a driver.

MFC after:	3 days
Reviewed by:	hselasky
Differential Revision: https://reviews.freebsd.org/D32598
This commit is contained in:
Bjoern A. Zeeb 2021-10-22 11:04:36 +00:00
parent eab5358b90
commit b382b78503
1 changed files with 33 additions and 0 deletions
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33
sys/compat/linuxkpi/common/include/linux/kernel.h
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@ -393,6 +393,24 @@ kstrtouint(const char *cp, unsigned int base, unsigned int *res)
return (0);
}
static inline int
kstrtou8(const char *cp, unsigned int base, u8 *res)
{
char *end;
unsigned long temp;
*res = temp = strtoul(cp, &end, base);
/* skip newline character, if any */
if (*end == '\n')
end++;
if (*cp == 0 || *end != 0)
return (-EINVAL);
if (temp != (u8)temp)
return (-ERANGE);
return (0);
}
static inline int
kstrtou16(const char *cp, unsigned int base, u16 *res)
{
@ -484,6 +502,21 @@ kstrtobool_from_user(const char __user *s, size_t count, bool *res)
return (kstrtobool(buf, res));
}
static inline int
kstrtou8_from_user(const char __user *s, size_t count, unsigned int base,
u8 *p)
{
char buf[8] = {};
if (count > (sizeof(buf) - 1))
count = (sizeof(buf) - 1);
if (copy_from_user(buf, s, count))
return (-EFAULT);
return (kstrtou8(buf, base, p));
}
#define min(x, y) ((x) < (y) ? (x) : (y))
#define max(x, y) ((x) > (y) ? (x) : (y))