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-rw-r--r--lib/kstrtox.c153
1 files changed, 120 insertions, 33 deletions
diff --git a/lib/kstrtox.c b/lib/kstrtox.c
index f78ae0c0c4e2..bdde40cd69d7 100644
--- a/lib/kstrtox.c
+++ b/lib/kstrtox.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
/*
* Convert integer string representation to an integer.
* If an integer doesn't fit into specified type, -E is returned.
@@ -13,13 +14,15 @@
*/
#include <linux/ctype.h>
#include <linux/errno.h>
-#include <linux/kernel.h>
-#include <linux/math64.h>
#include <linux/export.h>
+#include <linux/kstrtox.h>
+#include <linux/math64.h>
#include <linux/types.h>
-#include <asm/uaccess.h>
+#include <linux/uaccess.h>
+
#include "kstrtox.h"
+noinline
const char *_parse_integer_fixup_radix(const char *s, unsigned int *base)
{
if (*base == 0) {
@@ -38,28 +41,31 @@ const char *_parse_integer_fixup_radix(const char *s, unsigned int *base)
/*
* Convert non-negative integer string representation in explicitly given radix
- * to an integer.
+ * to an integer. A maximum of max_chars characters will be converted.
+ *
* Return number of characters consumed maybe or-ed with overflow bit.
* If overflow occurs, result integer (incorrect) is still returned.
*
* Don't you dare use this function.
*/
-unsigned int _parse_integer(const char *s, unsigned int base, unsigned long long *p)
+noinline
+unsigned int _parse_integer_limit(const char *s, unsigned int base, unsigned long long *p,
+ size_t max_chars)
{
unsigned long long res;
unsigned int rv;
- int overflow;
res = 0;
rv = 0;
- overflow = 0;
- while (*s) {
+ while (max_chars--) {
+ unsigned int c = *s;
+ unsigned int lc = _tolower(c);
unsigned int val;
- if ('0' <= *s && *s <= '9')
- val = *s - '0';
- else if ('a' <= _tolower(*s) && _tolower(*s) <= 'f')
- val = _tolower(*s) - 'a' + 10;
+ if ('0' <= c && c <= '9')
+ val = c - '0';
+ else if ('a' <= lc && lc <= 'f')
+ val = lc - 'a' + 10;
else
break;
@@ -71,18 +77,22 @@ unsigned int _parse_integer(const char *s, unsigned int base, unsigned long long
*/
if (unlikely(res & (~0ull << 60))) {
if (res > div_u64(ULLONG_MAX - val, base))
- overflow = 1;
+ rv |= KSTRTOX_OVERFLOW;
}
res = res * base + val;
rv++;
s++;
}
*p = res;
- if (overflow)
- rv |= KSTRTOX_OVERFLOW;
return rv;
}
+noinline
+unsigned int _parse_integer(const char *s, unsigned int base, unsigned long long *p)
+{
+ return _parse_integer_limit(s, base, p, INT_MAX);
+}
+
static int _kstrtoull(const char *s, unsigned int base, unsigned long long *res)
{
unsigned long long _res;
@@ -92,7 +102,6 @@ static int _kstrtoull(const char *s, unsigned int base, unsigned long long *res)
rv = _parse_integer(s, base, &_res);
if (rv & KSTRTOX_OVERFLOW)
return -ERANGE;
- rv &= ~KSTRTOX_OVERFLOW;
if (rv == 0)
return -EINVAL;
s += rv;
@@ -117,9 +126,9 @@ static int _kstrtoull(const char *s, unsigned int base, unsigned long long *res)
* @res: Where to write the result of the conversion on success.
*
* Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
- * Used as a replacement for the obsolete simple_strtoull. Return code must
- * be checked.
+ * Preferred over simple_strtoull(). Return code must be checked.
*/
+noinline
int kstrtoull(const char *s, unsigned int base, unsigned long long *res)
{
if (s[0] == '+')
@@ -141,9 +150,9 @@ EXPORT_SYMBOL(kstrtoull);
* @res: Where to write the result of the conversion on success.
*
* Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
- * Used as a replacement for the obsolete simple_strtoull. Return code must
- * be checked.
+ * Preferred over simple_strtoll(). Return code must be checked.
*/
+noinline
int kstrtoll(const char *s, unsigned int base, long long *res)
{
unsigned long long tmp;
@@ -153,7 +162,7 @@ int kstrtoll(const char *s, unsigned int base, long long *res)
rv = _kstrtoull(s + 1, base, &tmp);
if (rv < 0)
return rv;
- if ((long long)(-tmp) >= 0)
+ if ((long long)-tmp > 0)
return -ERANGE;
*res = -tmp;
} else {
@@ -177,7 +186,7 @@ int _kstrtoul(const char *s, unsigned int base, unsigned long *res)
rv = kstrtoull(s, base, &tmp);
if (rv < 0)
return rv;
- if (tmp != (unsigned long long)(unsigned long)tmp)
+ if (tmp != (unsigned long)tmp)
return -ERANGE;
*res = tmp;
return 0;
@@ -193,7 +202,7 @@ int _kstrtol(const char *s, unsigned int base, long *res)
rv = kstrtoll(s, base, &tmp);
if (rv < 0)
return rv;
- if (tmp != (long long)(long)tmp)
+ if (tmp != (long)tmp)
return -ERANGE;
*res = tmp;
return 0;
@@ -213,9 +222,9 @@ EXPORT_SYMBOL(_kstrtol);
* @res: Where to write the result of the conversion on success.
*
* Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
- * Used as a replacement for the obsolete simple_strtoull. Return code must
- * be checked.
+ * Preferred over simple_strtoul(). Return code must be checked.
*/
+noinline
int kstrtouint(const char *s, unsigned int base, unsigned int *res)
{
unsigned long long tmp;
@@ -224,7 +233,7 @@ int kstrtouint(const char *s, unsigned int base, unsigned int *res)
rv = kstrtoull(s, base, &tmp);
if (rv < 0)
return rv;
- if (tmp != (unsigned long long)(unsigned int)tmp)
+ if (tmp != (unsigned int)tmp)
return -ERANGE;
*res = tmp;
return 0;
@@ -244,9 +253,9 @@ EXPORT_SYMBOL(kstrtouint);
* @res: Where to write the result of the conversion on success.
*
* Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
- * Used as a replacement for the obsolete simple_strtoull. Return code must
- * be checked.
+ * Preferred over simple_strtol(). Return code must be checked.
*/
+noinline
int kstrtoint(const char *s, unsigned int base, int *res)
{
long long tmp;
@@ -255,13 +264,14 @@ int kstrtoint(const char *s, unsigned int base, int *res)
rv = kstrtoll(s, base, &tmp);
if (rv < 0)
return rv;
- if (tmp != (long long)(int)tmp)
+ if (tmp != (int)tmp)
return -ERANGE;
*res = tmp;
return 0;
}
EXPORT_SYMBOL(kstrtoint);
+noinline
int kstrtou16(const char *s, unsigned int base, u16 *res)
{
unsigned long long tmp;
@@ -270,13 +280,14 @@ int kstrtou16(const char *s, unsigned int base, u16 *res)
rv = kstrtoull(s, base, &tmp);
if (rv < 0)
return rv;
- if (tmp != (unsigned long long)(u16)tmp)
+ if (tmp != (u16)tmp)
return -ERANGE;
*res = tmp;
return 0;
}
EXPORT_SYMBOL(kstrtou16);
+noinline
int kstrtos16(const char *s, unsigned int base, s16 *res)
{
long long tmp;
@@ -285,13 +296,14 @@ int kstrtos16(const char *s, unsigned int base, s16 *res)
rv = kstrtoll(s, base, &tmp);
if (rv < 0)
return rv;
- if (tmp != (long long)(s16)tmp)
+ if (tmp != (s16)tmp)
return -ERANGE;
*res = tmp;
return 0;
}
EXPORT_SYMBOL(kstrtos16);
+noinline
int kstrtou8(const char *s, unsigned int base, u8 *res)
{
unsigned long long tmp;
@@ -300,13 +312,14 @@ int kstrtou8(const char *s, unsigned int base, u8 *res)
rv = kstrtoull(s, base, &tmp);
if (rv < 0)
return rv;
- if (tmp != (unsigned long long)(u8)tmp)
+ if (tmp != (u8)tmp)
return -ERANGE;
*res = tmp;
return 0;
}
EXPORT_SYMBOL(kstrtou8);
+noinline
int kstrtos8(const char *s, unsigned int base, s8 *res)
{
long long tmp;
@@ -315,13 +328,87 @@ int kstrtos8(const char *s, unsigned int base, s8 *res)
rv = kstrtoll(s, base, &tmp);
if (rv < 0)
return rv;
- if (tmp != (long long)(s8)tmp)
+ if (tmp != (s8)tmp)
return -ERANGE;
*res = tmp;
return 0;
}
EXPORT_SYMBOL(kstrtos8);
+/**
+ * kstrtobool - convert common user inputs into boolean values
+ * @s: input string
+ * @res: result
+ *
+ * This routine returns 0 iff the first character is one of 'YyTt1NnFf0', or
+ * [oO][NnFf] for "on" and "off". Otherwise it will return -EINVAL. Value
+ * pointed to by res is updated upon finding a match.
+ */
+noinline
+int kstrtobool(const char *s, bool *res)
+{
+ if (!s)
+ return -EINVAL;
+
+ switch (s[0]) {
+ case 'e':
+ case 'E':
+ case 'y':
+ case 'Y':
+ case 't':
+ case 'T':
+ case '1':
+ *res = true;
+ return 0;
+ case 'd':
+ case 'D':
+ case 'n':
+ case 'N':
+ case 'f':
+ case 'F':
+ case '0':
+ *res = false;
+ return 0;
+ case 'o':
+ case 'O':
+ switch (s[1]) {
+ case 'n':
+ case 'N':
+ *res = true;
+ return 0;
+ case 'f':
+ case 'F':
+ *res = false;
+ return 0;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+
+ return -EINVAL;
+}
+EXPORT_SYMBOL(kstrtobool);
+
+/*
+ * Since "base" would be a nonsense argument, this open-codes the
+ * _from_user helper instead of using the helper macro below.
+ */
+int kstrtobool_from_user(const char __user *s, size_t count, bool *res)
+{
+ /* Longest string needed to differentiate, newline, terminator */
+ char buf[4];
+
+ count = min(count, sizeof(buf) - 1);
+ if (copy_from_user(buf, s, count))
+ return -EFAULT;
+ buf[count] = '\0';
+ return kstrtobool(buf, res);
+}
+EXPORT_SYMBOL(kstrtobool_from_user);
+
#define kstrto_from_user(f, g, type) \
int f(const char __user *s, size_t count, unsigned int base, type *res) \
{ \
generated by cgit (git 2.34.1) at 2025-12-21 21:10:35 +0000