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/* Convert string representation of a number into an integer value.
Copyright (C) 1991-1992, 1994-1999, 2003, 2005-2007, 2009-2012 Free Software
Foundation, Inc.
NOTE: The canonical source of this file is maintained with the GNU C
Library. Bugs can be reported to bug-glibc@gnu.org.
This program is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3 of the License, or any
later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifdef _LIBC
# define USE_NUMBER_GROUPING
#else
# include <config.h>
#endif
#include "unicode.h"
#include <errno.h>
#ifndef __set_errno
# define __set_errno(Val) errno = (Val)
#endif
#include <limits.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
/* Convert NPTR to an 'unsigned long int' or 'long int' in base BASE.
If BASE is 0 the base is determined by the presence of a leading
zero, indicating octal or a leading "0x" or "0X", indicating hexadecimal.
If BASE is < 2 or > 36, it is reset to 10.
If ENDPTR is not NULL, a pointer to the character after the last
one converted is stored in *ENDPTR. */
long
strtolW (const WCHAR *nptr, WCHAR **endptr, int base)
{
int negative;
unsigned long cutoff;
unsigned int cutlim;
unsigned long i;
const WCHAR *s;
UCHAR c;
const WCHAR *save, *end;
int overflow;
if (base < 0 || base == 1 || base > 36)
{
__set_errno (EINVAL);
return 0;
}
save = s = nptr;
/* Skip white space. */
while (*s == ' ' || *s == '\n' )
++s;
if (*s == '\0')
goto noconv;
/* Check for a sign. */
if (*s == '-')
{
negative = 1;
++s;
}
else if (*s == '+')
{
negative = 0;
++s;
}
else
negative = 0;
/* Recognize number prefix and if BASE is zero, figure it out ourselves. */
if (*s == '0')
{
if ((base == 0 || base == 16) && (s[1] == 'X' || s[1] == 'x'))
{
s += 2;
base = 16;
}
else if (base == 0)
base = 8;
}
else if (base == 0)
base = 10;
/* Save the pointer so we can check later if anything happened. */
save = s;
end = NULL;
cutoff = ULONG_MAX / (unsigned long) base;
cutlim = ULONG_MAX % (unsigned long) base;
overflow = 0;
i = 0;
for (c = *s; c; c = *++s)
{
if (s == end)
break;
if (c >= '0' && c <= '9')
c -= '0';
else if (c >= 'A' && c <= 'Z')
c = c - 'A' + 10;
else if (c >= 'a' && c <= 'z')
c = c - 'a' + 10;
else
break;
if ((int) c >= base)
break;
/* Check for overflow. */
if (i > cutoff || (i == cutoff && c > cutlim))
overflow = 1;
else
{
i *= (unsigned long) base;
i += c;
}
}
/* Check if anything actually happened. */
if (s == save)
goto noconv;
/* Store in ENDPTR the address of one character
past the last character we converted. */
if (endptr != NULL)
*endptr = (WCHAR *) s;
/* Check for a value that is within the range of
'unsigned long', but outside the range of 'long'. */
if (overflow == 0
&& i > (negative
? -((unsigned long int) (LONG_MIN + 1)) + 1
: (unsigned long int) LONG_MAX))
overflow = 1;
if (overflow)
{
__set_errno (ERANGE);
return ULONG_MAX;
}
/* Return the result of the appropriate sign. */
return negative ? -i : i;
noconv:
/* We must handle a special case here: the base is 0 or 16 and the
first two characters are '0' and 'x', but the rest are no
hexadecimal digits. This is no error case. We return 0 and
ENDPTR points to the 'x'. */
if (endptr != NULL)
{
if (save - nptr >= 2 && (save[-1] == 'X' || save[-1] == 'x')
&& save[-2] == '0')
*endptr = (WCHAR *) &save[-1];
else
/* There was no number to convert. */
*endptr = (WCHAR *) nptr;
}
return 0L;
}
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