237 lines
4.4 KiB
C
237 lines
4.4 KiB
C
/*
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* Convert integer string representation to an integer.
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* If an integer doesn't fit into specified type, -E is returned.
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*
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* Integer starts with optional sign.
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* kstrtou*() functions do not accept sign "-".
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*
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* Radix 0 means autodetection: leading "0x" implies radix 16,
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* leading "0" implies radix 8, otherwise radix is 10.
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* Autodetection hints work after optional sign, but not before.
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*
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* If -E is returned, result is not touched.
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*/
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#include <linux/kernel.h>
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/*
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* kstrto* was included in kernel 2.6.38.4 and causes conflicts with the
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* version included in compat-drivers. We use strict_strtol to check if
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* kstrto* is already available.
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*/
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#ifndef strict_strtol
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#include <linux/ctype.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/math64.h>
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#include <linux/module.h>
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#include <linux/types.h>
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static inline char _tolower(const char c)
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{
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return c | 0x20;
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}
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static int _kstrtoull(const char *s, unsigned int base, unsigned long long *res)
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{
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unsigned long long acc;
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int ok;
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if (base == 0) {
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if (s[0] == '0') {
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if (_tolower(s[1]) == 'x' && isxdigit(s[2]))
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base = 16;
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else
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base = 8;
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} else
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base = 10;
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}
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if (base == 16 && s[0] == '0' && _tolower(s[1]) == 'x')
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s += 2;
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acc = 0;
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ok = 0;
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while (*s) {
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unsigned int val;
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if ('0' <= *s && *s <= '9')
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val = *s - '0';
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else if ('a' <= _tolower(*s) && _tolower(*s) <= 'f')
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val = _tolower(*s) - 'a' + 10;
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else if (*s == '\n') {
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if (*(s + 1) == '\0')
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break;
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else
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return -EINVAL;
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} else
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return -EINVAL;
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if (val >= base)
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return -EINVAL;
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if (acc > div_u64(ULLONG_MAX - val, base))
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return -ERANGE;
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acc = acc * base + val;
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ok = 1;
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s++;
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}
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if (!ok)
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return -EINVAL;
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*res = acc;
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return 0;
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}
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int kstrtoull(const char *s, unsigned int base, unsigned long long *res)
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{
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if (s[0] == '+')
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s++;
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return _kstrtoull(s, base, res);
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}
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EXPORT_SYMBOL_GPL(kstrtoull);
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int kstrtoll(const char *s, unsigned int base, long long *res)
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{
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unsigned long long tmp;
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int rv;
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if (s[0] == '-') {
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rv = _kstrtoull(s + 1, base, &tmp);
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if (rv < 0)
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return rv;
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if ((long long)(-tmp) >= 0)
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return -ERANGE;
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*res = -tmp;
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} else {
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rv = kstrtoull(s, base, &tmp);
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if (rv < 0)
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return rv;
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if ((long long)tmp < 0)
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return -ERANGE;
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*res = tmp;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(kstrtoll);
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/* Internal, do not use. */
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int _kstrtoul(const char *s, unsigned int base, unsigned long *res)
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{
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unsigned long long tmp;
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int rv;
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rv = kstrtoull(s, base, &tmp);
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if (rv < 0)
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return rv;
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if (tmp != (unsigned long long)(unsigned long)tmp)
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return -ERANGE;
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*res = tmp;
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return 0;
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}
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EXPORT_SYMBOL_GPL(_kstrtoul);
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/* Internal, do not use. */
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int _kstrtol(const char *s, unsigned int base, long *res)
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{
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long long tmp;
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int rv;
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rv = kstrtoll(s, base, &tmp);
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if (rv < 0)
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return rv;
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if (tmp != (long long)(long)tmp)
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return -ERANGE;
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*res = tmp;
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return 0;
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}
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EXPORT_SYMBOL_GPL(_kstrtol);
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int kstrtouint(const char *s, unsigned int base, unsigned int *res)
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{
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unsigned long long tmp;
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int rv;
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rv = kstrtoull(s, base, &tmp);
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if (rv < 0)
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return rv;
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if (tmp != (unsigned long long)(unsigned int)tmp)
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return -ERANGE;
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*res = tmp;
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return 0;
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}
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EXPORT_SYMBOL_GPL(kstrtouint);
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int kstrtoint(const char *s, unsigned int base, int *res)
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{
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long long tmp;
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int rv;
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rv = kstrtoll(s, base, &tmp);
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if (rv < 0)
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return rv;
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if (tmp != (long long)(int)tmp)
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return -ERANGE;
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*res = tmp;
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return 0;
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}
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EXPORT_SYMBOL_GPL(kstrtoint);
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int kstrtou16(const char *s, unsigned int base, u16 *res)
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{
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unsigned long long tmp;
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int rv;
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rv = kstrtoull(s, base, &tmp);
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if (rv < 0)
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return rv;
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if (tmp != (unsigned long long)(u16)tmp)
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return -ERANGE;
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*res = tmp;
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return 0;
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}
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EXPORT_SYMBOL_GPL(kstrtou16);
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int kstrtos16(const char *s, unsigned int base, s16 *res)
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{
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long long tmp;
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int rv;
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rv = kstrtoll(s, base, &tmp);
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if (rv < 0)
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return rv;
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if (tmp != (long long)(s16)tmp)
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return -ERANGE;
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*res = tmp;
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return 0;
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}
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EXPORT_SYMBOL_GPL(kstrtos16);
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int kstrtou8(const char *s, unsigned int base, u8 *res)
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{
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unsigned long long tmp;
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int rv;
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rv = kstrtoull(s, base, &tmp);
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if (rv < 0)
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return rv;
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if (tmp != (unsigned long long)(u8)tmp)
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return -ERANGE;
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*res = tmp;
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return 0;
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}
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EXPORT_SYMBOL_GPL(kstrtou8);
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int kstrtos8(const char *s, unsigned int base, s8 *res)
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{
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long long tmp;
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int rv;
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rv = kstrtoll(s, base, &tmp);
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if (rv < 0)
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return rv;
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if (tmp != (long long)(s8)tmp)
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return -ERANGE;
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*res = tmp;
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return 0;
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}
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EXPORT_SYMBOL_GPL(kstrtos8);
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#endif /* #ifndef strict_strtol */
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