+++ /dev/null
-/*
- * Convert integer string representation to an integer.
- * If an integer doesn't fit into specified type, -E is returned.
- *
- * Integer starts with optional sign.
- * kstrtou*() functions do not accept sign "-".
- *
- * Radix 0 means autodetection: leading "0x" implies radix 16,
- * leading "0" implies radix 8, otherwise radix is 10.
- * Autodetection hints work after optional sign, but not before.
- *
- * If -E is returned, result is not touched.
- */
-#include <errno.h>
-#include <ctype.h>
-#include <linux/kernel.h>
-#include <linux/types.h>
-#include "kstrtox.h"
-
-#define KSTRTOX_OVERFLOW (1U << 31)
-
-const char *_parse_integer_fixup_radix(const char *s, unsigned int *base)
-{
- if (*base == 0) {
- if (s[0] == '0') {
- if (_tolower(s[1]) == 'x' && isxdigit(s[2]))
- *base = 16;
- else
- *base = 8;
- } else
- *base = 10;
- }
- if (*base == 16 && s[0] == '0' && _tolower(s[1]) == 'x')
- s += 2;
- return s;
-}
-
-/*
- * Convert non-negative integer string representation in explicitly given radix
- * to an integer.
- * 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)
-{
- unsigned long long res;
- unsigned int rv;
- int overflow;
-
- res = 0;
- rv = 0;
- overflow = 0;
- while (*s) {
- unsigned int val;
-
- if ('0' <= *s && *s <= '9')
- val = *s - '0';
- else if ('a' <= _tolower(*s) && _tolower(*s) <= 'f')
- val = _tolower(*s) - 'a' + 10;
- else
- break;
-
- if (val >= base)
- break;
- /*
- * Check for overflow only if we are within range of
- * it in the max base we support (16)
- */
- if (unlikely(res & (~0ull << 60))) {
- if (res > ULLONG_MAX - val / base)
- overflow = 1;
- }
- res = res * base + val;
- rv++;
- s++;
- }
- *p = res;
- if (overflow)
- rv |= KSTRTOX_OVERFLOW;
- return rv;
-}
-
-static int _kstrtoull(const char *s, unsigned int base, unsigned long long *res)
-{
- unsigned long long _res;
- unsigned int rv;
-
- s = _parse_integer_fixup_radix(s, &base);
- rv = _parse_integer(s, base, &_res);
- if (rv & KSTRTOX_OVERFLOW)
- return -ERANGE;
- if (rv == 0)
- return -EINVAL;
- s += rv;
- if (*s == '\n')
- s++;
- if (*s)
- return -EINVAL;
- *res = _res;
- return 0;
-}
-
-/**
- * kstrtoull - convert a string to an unsigned long long
- * @s: The start of the string. The string must be null-terminated, and may also
- * include a single newline before its terminating null. The first character
- * may also be a plus sign, but not a minus sign.
- * @base: The number base to use. The maximum supported base is 16. If base is
- * given as 0, then the base of the string is automatically detected with the
- * conventional semantics - If it begins with 0x the number will be parsed as a
- * hexadecimal (case insensitive), if it otherwise begins with 0, it will be
- * parsed as an octal number. Otherwise it will be parsed as a decimal.
- * @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.
- */
-int kstrtoull(const char *s, unsigned int base, unsigned long long *res)
-{
- if (s[0] == '+')
- s++;
- return _kstrtoull(s, base, res);
-}
-
-/**
- * kstrtoll - convert a string to a long long
- * @s: The start of the string. The string must be null-terminated, and may also
- * include a single newline before its terminating null. The first character
- * may also be a plus sign or a minus sign.
- * @base: The number base to use. The maximum supported base is 16. If base is
- * given as 0, then the base of the string is automatically detected with the
- * conventional semantics - If it begins with 0x the number will be parsed as a
- * hexadecimal (case insensitive), if it otherwise begins with 0, it will be
- * parsed as an octal number. Otherwise it will be parsed as a decimal.
- * @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.
- */
-int kstrtoll(const char *s, unsigned int base, long long *res)
-{
- unsigned long long tmp;
- int rv;
-
- if (s[0] == '-') {
- rv = _kstrtoull(s + 1, base, &tmp);
- if (rv < 0)
- return rv;
- if ((long long)-tmp > 0)
- return -ERANGE;
- *res = -tmp;
- } else {
- rv = kstrtoull(s, base, &tmp);
- if (rv < 0)
- return rv;
- if ((long long)tmp < 0)
- return -ERANGE;
- *res = tmp;
- }
- return 0;
-}
-
-/* Internal, do not use. */
-int _kstrtoul(const char *s, unsigned int base, unsigned long *res)
-{
- unsigned long long tmp;
- int rv;
-
- rv = kstrtoull(s, base, &tmp);
- if (rv < 0)
- return rv;
- if (tmp != (unsigned long long)(unsigned long)tmp)
- return -ERANGE;
- *res = tmp;
- return 0;
-}
-
-/* Internal, do not use. */
-int _kstrtol(const char *s, unsigned int base, long *res)
-{
- long long tmp;
- int rv;
-
- rv = kstrtoll(s, base, &tmp);
- if (rv < 0)
- return rv;
- if (tmp != (long long)(long)tmp)
- return -ERANGE;
- *res = tmp;
- return 0;
-}
-
-/**
- * kstrtouint - convert a string to an unsigned int
- * @s: The start of the string. The string must be null-terminated, and may also
- * include a single newline before its terminating null. The first character
- * may also be a plus sign, but not a minus sign.
- * @base: The number base to use. The maximum supported base is 16. If base is
- * given as 0, then the base of the string is automatically detected with the
- * conventional semantics - If it begins with 0x the number will be parsed as a
- * hexadecimal (case insensitive), if it otherwise begins with 0, it will be
- * parsed as an octal number. Otherwise it will be parsed as a decimal.
- * @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.
- */
-int kstrtouint(const char *s, unsigned int base, unsigned int *res)
-{
- unsigned long long tmp;
- int rv;
-
- rv = kstrtoull(s, base, &tmp);
- if (rv < 0)
- return rv;
- if (tmp != (unsigned long long)(unsigned int)tmp)
- return -ERANGE;
- *res = tmp;
- return 0;
-}
-
-/**
- * kstrtoint - convert a string to an int
- * @s: The start of the string. The string must be null-terminated, and may also
- * include a single newline before its terminating null. The first character
- * may also be a plus sign or a minus sign.
- * @base: The number base to use. The maximum supported base is 16. If base is
- * given as 0, then the base of the string is automatically detected with the
- * conventional semantics - If it begins with 0x the number will be parsed as a
- * hexadecimal (case insensitive), if it otherwise begins with 0, it will be
- * parsed as an octal number. Otherwise it will be parsed as a decimal.
- * @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.
- */
-int kstrtoint(const char *s, unsigned int base, int *res)
-{
- long long tmp;
- int rv;
-
- rv = kstrtoll(s, base, &tmp);
- if (rv < 0)
- return rv;
- if (tmp != (long long)(int)tmp)
- return -ERANGE;
- *res = tmp;
- return 0;
-}
-
-int kstrtou16(const char *s, unsigned int base, u16 *res)
-{
- unsigned long long tmp;
- int rv;
-
- rv = kstrtoull(s, base, &tmp);
- if (rv < 0)
- return rv;
- if (tmp != (unsigned long long)(u16)tmp)
- return -ERANGE;
- *res = tmp;
- return 0;
-}
-
-int kstrtos16(const char *s, unsigned int base, s16 *res)
-{
- long long tmp;
- int rv;
-
- rv = kstrtoll(s, base, &tmp);
- if (rv < 0)
- return rv;
- if (tmp != (long long)(s16)tmp)
- return -ERANGE;
- *res = tmp;
- return 0;
-}
-
-int kstrtou8(const char *s, unsigned int base, u8 *res)
-{
- unsigned long long tmp;
- int rv;
-
- rv = kstrtoull(s, base, &tmp);
- if (rv < 0)
- return rv;
- if (tmp != (unsigned long long)(u8)tmp)
- return -ERANGE;
- *res = tmp;
- return 0;
-}
-
-int kstrtos8(const char *s, unsigned int base, s8 *res)
-{
- long long tmp;
- int rv;
-
- rv = kstrtoll(s, base, &tmp);
- if (rv < 0)
- return rv;
- if (tmp != (long long)(s8)tmp)
- return -ERANGE;
- *res = tmp;
- return 0;
-}
-
-/**
- * kstrtobool - convert common user inputs into boolean values
- * @s: input string
- * @res: result
- *
- * This routine returns 0 iff the first character is one of 'Yy1Nn0', or
- * [oO][NnFf] for "on" and "off". Otherwise it will return -EINVAL. Value
- * pointed to by res is updated upon finding a match.
- */
-int kstrtobool(const char *s, bool *res)
-{
- if (!s)
- return -EINVAL;
-
- switch (s[0]) {
- case 'y':
- case 'Y':
- case '1':
- *res = true;
- return 0;
- case 'n':
- case 'N':
- 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;
- }
- default:
- break;
- }
-
- return -EINVAL;
-}
projects / bcachefs-tools-debian / blobdiff