117 lines
2.9 KiB
C
117 lines
2.9 KiB
C
/* _Stoull function */
|
|
#include <stdlib.h>
|
|
#include <ctype.h>
|
|
#include <errno.h>
|
|
#include <limits.h>
|
|
#include <stddef.h>
|
|
#include <string.h>
|
|
#include "xmath.h"
|
|
|
|
#define MYMAX _ULLONG_MAX /* ULLONG_MAX */
|
|
|
|
#if (MYMAX >> 16) >> 16 != 0xffffffff && MYMAX != 0xffffffff
|
|
#error LONG LONGS TOO LARGE FOR _Stoull
|
|
#endif /* long longs too large */
|
|
|
|
#define BIG_TABLE (MYMAX >> 16) >> 16 == 0xffffffff
|
|
|
|
_C_STD_BEGIN
|
|
|
|
/* macros */
|
|
#define BASE_MAX 36 /* largest valid base */
|
|
|
|
/* static data */
|
|
static const char digits[] = /* valid digits */
|
|
"0123456789abcdefghijklmnopqrstuvwxyz";
|
|
|
|
#if BIG_TABLE
|
|
static const char ndigs[BASE_MAX + 1] = { /* 64-bits! */
|
|
0, 0, 65, 41, 33, 28, 25, 23, 22, 21,
|
|
20, 19, 18, 18, 17, 17, 17, 16, 16, 16,
|
|
15, 15, 15, 15, 14, 14, 14, 14, 14, 14,
|
|
14, 13, 13, 13, 13, 13, 13,};
|
|
|
|
#else /* BIG_TABLE */
|
|
static const char ndigs[BASE_MAX+1] = { /* 32-bits! */
|
|
0, 0, 33, 21, 17, 14, 13, 12, 11, 11,
|
|
10, 10, 9, 9, 9, 9, 9, 8, 8, 8,
|
|
8, 8, 8, 8, 7, 7, 7, 7, 7, 7,
|
|
7, 7, 7, 7, 7, 7, 7,};
|
|
#endif /* BIG_TABLE */
|
|
|
|
_CRTIMP2_PURE _ULonglong __CLRCALL_PURE_OR_CDECL _Stoullx(const char *s, char **endptr,
|
|
int base, int *perr)
|
|
{ /* convert string to unsigned long long, with checking */
|
|
const char *sc, *sd;
|
|
const char *s1, *s2;
|
|
char dig, sign;
|
|
ptrdiff_t n;
|
|
_ULonglong x, y;
|
|
|
|
if (perr != 0)
|
|
*perr = 0;
|
|
for (sc = s; isspace((unsigned char)*sc); ++sc)
|
|
;
|
|
sign = (char)(*sc == '-' || *sc == '+' ? *sc++ : '+');
|
|
if (base < 0 || base == 1 || BASE_MAX < base)
|
|
{ /* silly base */
|
|
if (endptr != 0)
|
|
*endptr = (char *)s;
|
|
return (0);
|
|
}
|
|
else if (0 < base)
|
|
{ /* strip 0x or 0X */
|
|
if (base == 16 && *sc == '0'
|
|
&& (sc[1] == 'x' || sc[1] == 'X'))
|
|
sc += 2;
|
|
}
|
|
else if (*sc != '0')
|
|
base = 10;
|
|
else if (sc[1] == 'x' || sc[1] == 'X')
|
|
base = 16, sc += 2;
|
|
else
|
|
base = 8;
|
|
for (s1 = sc; *sc == '0'; ++sc)
|
|
; /* skip leading zeros */
|
|
x = 0;
|
|
for (s2 = sc, y = 0, dig = 0; (sd = (char *)memchr(&digits[0],
|
|
tolower(*sc), base)) != 0; ++sc)
|
|
{ /* accumulate digits */
|
|
y = x;
|
|
dig = (char)(sd - digits); /* for overflow checking */
|
|
x = x * base + dig;
|
|
}
|
|
if (s1 == sc)
|
|
{ /* check string validity */
|
|
if (endptr != 0)
|
|
*endptr = (char *)s;
|
|
return (0);
|
|
}
|
|
n = sc - s2 - ndigs[base];
|
|
if (n < 0)
|
|
;
|
|
else if (0 < n || x < x - dig || (x - dig) / base != y)
|
|
{ /* overflow */
|
|
errno = ERANGE;
|
|
if (perr != 0)
|
|
*perr = 1;
|
|
x = MYMAX, sign = '+';
|
|
}
|
|
if (sign == '-') /* get final value */
|
|
x = 0 - x;
|
|
if (endptr != 0)
|
|
*endptr = (char *)sc;
|
|
return (x);
|
|
}
|
|
|
|
_CRTIMP2_PURE _ULonglong __CLRCALL_PURE_OR_CDECL _Stoull(const char *s, char **endptr, int base)
|
|
{ /* convert string, discard error code */
|
|
return (_Stoullx(s, endptr, base, 0));
|
|
}
|
|
_C_STD_END
|
|
|
|
/*
|
|
* Copyright (c) 1992-2007 by P.J. Plauger. ALL RIGHTS RESERVED.
|
|
* Consult your license regarding permissions and restrictions.
|
|
V5.03:0009 */
|