218 lines
7.3 KiB
C
218 lines
7.3 KiB
C
/*
|
|
FUNCTION
|
|
<<strtoull>>, <<strtoull_l>>---string to unsigned long long
|
|
|
|
INDEX
|
|
strtoull
|
|
|
|
INDEX
|
|
strtoull_l
|
|
|
|
SYNOPSIS
|
|
#include <stdlib.h>
|
|
unsigned long long strtoull(const char *restrict <[s]>,
|
|
char **restrict <[ptr]>, int <[base]>);
|
|
|
|
#include <stdlib.h>
|
|
unsigned long long strtoull_l(const char *restrict <[s]>,
|
|
char **restrict <[ptr]>, int <[base]>,
|
|
locale_t <[locale]>);
|
|
|
|
unsigned long long _strtoull_r(void *<[reent]>,
|
|
const char *restrict <[s]>,
|
|
char **restrict <[ptr]>, int <[base]>);
|
|
|
|
DESCRIPTION
|
|
The function <<strtoull>> converts the string <<*<[s]>>> to
|
|
an <<unsigned long long>>. First, it breaks down the string into three parts:
|
|
leading whitespace, which is ignored; a subject string consisting
|
|
of the digits meaningful in the radix specified by <[base]>
|
|
(for example, <<0>> through <<7>> if the value of <[base]> is 8);
|
|
and a trailing portion consisting of one or more unparseable characters,
|
|
which always includes the terminating null character. Then, it attempts
|
|
to convert the subject string into an unsigned long long integer, and returns the
|
|
result.
|
|
|
|
If the value of <[base]> is zero, the subject string is expected to look
|
|
like a normal C integer constant (save that no optional sign is permitted):
|
|
a possible <<0x>> indicating hexadecimal radix, and a number.
|
|
If <[base]> is between 2 and 36, the expected form of the subject is a
|
|
sequence of digits (which may include letters, depending on the
|
|
base) representing an integer in the radix specified by <[base]>.
|
|
The letters <<a>>--<<z>> (or <<A>>--<<Z>>) are used as digits valued from
|
|
10 to 35. If <[base]> is 16, a leading <<0x>> is permitted.
|
|
|
|
The subject sequence is the longest initial sequence of the input
|
|
string that has the expected form, starting with the first
|
|
non-whitespace character. If the string is empty or consists entirely
|
|
of whitespace, or if the first non-whitespace character is not a
|
|
permissible digit, the subject string is empty.
|
|
|
|
If the subject string is acceptable, and the value of <[base]> is zero,
|
|
<<strtoull>> attempts to determine the radix from the input string. A
|
|
string with a leading <<0x>> is treated as a hexadecimal value; a string with
|
|
a leading <<0>> and no <<x>> is treated as octal; all other strings are
|
|
treated as decimal. If <[base]> is between 2 and 36, it is used as the
|
|
conversion radix, as described above. Finally, a pointer to the first
|
|
character past the converted subject string is stored in <[ptr]>, if
|
|
<[ptr]> is not <<NULL>>.
|
|
|
|
If the subject string is empty (that is, if <<*>><[s]> does not start
|
|
with a substring in acceptable form), no conversion
|
|
is performed and the value of <[s]> is stored in <[ptr]> (if <[ptr]> is
|
|
not <<NULL>>).
|
|
|
|
<<strtoull_l>> is like <<strtoull>> but performs the conversion based on the
|
|
locale specified by the locale object locale. If <[locale]> is
|
|
LC_GLOBAL_LOCALE or not a valid locale object, the behaviour is undefined.
|
|
|
|
The alternate function <<_strtoull_r>> is a reentrant version. The
|
|
extra argument <[reent]> is a pointer to a reentrancy structure.
|
|
|
|
RETURNS
|
|
<<strtoull>>, <<strtoull_l>> return the converted value, if any. If no
|
|
conversion was made, <<0>> is returned.
|
|
|
|
<<strtoull>>, <<strtoull_l>> return <<ULONG_LONG_MAX>> if the magnitude
|
|
of the converted value is too large, and sets <<errno>> to <<ERANGE>>.
|
|
|
|
PORTABILITY
|
|
<<strtoull>> is ANSI.
|
|
<<strtoull_l>> is a GNU extension.
|
|
|
|
<<strtoull>> requires no supporting OS subroutines.
|
|
*/
|
|
|
|
/*
|
|
* Copyright (c) 1990 Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#define _GNU_SOURCE
|
|
#include <_ansi.h>
|
|
#include <limits.h>
|
|
#include <ctype.h>
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <reent.h>
|
|
#include "../locale/setlocale.h"
|
|
|
|
/*
|
|
* Convert a string to an unsigned long long integer.
|
|
*/
|
|
static unsigned long long
|
|
_strtoull_l (struct _reent *rptr, const char *__restrict nptr,
|
|
char **__restrict endptr, int base, locale_t loc)
|
|
{
|
|
register const unsigned char *s = (const unsigned char *)nptr;
|
|
register unsigned long long acc;
|
|
register int c;
|
|
register unsigned long long cutoff;
|
|
register int neg = 0, any, cutlim;
|
|
|
|
/*
|
|
* See strtol for comments as to the logic used.
|
|
*/
|
|
do {
|
|
c = *s++;
|
|
} while (isspace_l(c, loc));
|
|
if (c == '-') {
|
|
neg = 1;
|
|
c = *s++;
|
|
} else if (c == '+')
|
|
c = *s++;
|
|
if ((base == 0 || base == 16) &&
|
|
c == '0' && (*s == 'x' || *s == 'X')) {
|
|
c = s[1];
|
|
s += 2;
|
|
base = 16;
|
|
}
|
|
if (base == 0)
|
|
base = c == '0' ? 8 : 10;
|
|
cutoff = (unsigned long long)ULONG_LONG_MAX / (unsigned long long)base;
|
|
cutlim = (unsigned long long)ULONG_LONG_MAX % (unsigned long long)base;
|
|
for (acc = 0, any = 0;; c = *s++) {
|
|
if (c >= '0' && c <= '9')
|
|
c -= '0';
|
|
else if (c >= 'A' && c <= 'Z')
|
|
c -= 'A' - 10;
|
|
else if (c >= 'a' && c <= 'z')
|
|
c -= 'a' - 10;
|
|
else
|
|
break;
|
|
if (c >= base)
|
|
break;
|
|
if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
|
|
any = -1;
|
|
else {
|
|
any = 1;
|
|
acc *= base;
|
|
acc += c;
|
|
}
|
|
}
|
|
if (any < 0) {
|
|
acc = ULONG_LONG_MAX;
|
|
rptr->_errno = ERANGE;
|
|
} else if (neg)
|
|
acc = -acc;
|
|
if (endptr != 0)
|
|
*endptr = (char *) (any ? (char *)s - 1 : nptr);
|
|
return (acc);
|
|
}
|
|
|
|
unsigned long long
|
|
_strtoull_r (struct _reent *rptr,
|
|
const char *__restrict nptr,
|
|
char **__restrict endptr,
|
|
int base)
|
|
{
|
|
return _strtoull_l (rptr, nptr, endptr, base, __get_current_locale ());
|
|
}
|
|
|
|
#ifndef _REENT_ONLY
|
|
|
|
unsigned long long
|
|
strtoull_l (const char *__restrict s, char **__restrict ptr, int base,
|
|
locale_t loc)
|
|
{
|
|
return _strtoull_l (_REENT, s, ptr, base, loc);
|
|
}
|
|
|
|
unsigned long long
|
|
strtoull (const char *__restrict s,
|
|
char **__restrict ptr,
|
|
int base)
|
|
{
|
|
return _strtoull_l (_REENT, s, ptr, base, __get_current_locale ());
|
|
}
|
|
|
|
#endif
|