4coder-non-source/test_data/lots_of_files/xstoul.c

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2023-09-30 01:17:40 +00:00
/* _Stoul function */
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <stddef.h>
#include <string.h>
#include "xmath.h"
#pragma warning(disable: 4701)
#if (ULONG_MAX >> 16) >> 16 != 0xffffffff && ULONG_MAX != 0xffffffff
#error LONGS TOO LARGE FOR _Stoul
#endif /* longs too large */
_C_STD_BEGIN
/* macros */
#define BASE_MAX 36 /* largest valid base */
/* static data */
static const char digits[] = /* valid digits */
"0123456789abcdefghijklmnopqrstuvwxyz";
#if (ULONG_MAX >> 16) >> 16 == 0xffffffff
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 /* (ULONG_MAX >> 16) >> 16 == 0xffffffff */
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 /* (ULONG_MAX >> 16) >> 16 == 0xffffffff */
#if defined(__cplusplus) && !defined(MRTDLL)
extern "C"
#endif
_CRTIMP2_PURE unsigned long __CLRCALL_PURE_OR_CDECL _Stoulx(const char *s, char **endptr,
int base, int *perr)
{ /* convert string to unsigned long, with checking */
const char *sc, *sd;
const char *s1, *s2;
char dig, sign;
ptrdiff_t n;
unsigned long x, y;
if (perr != 0)
*perr = 0;
for (sc = s; isspace((unsigned char)*sc); ++sc)
;
sign = *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; (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 = ULONG_MAX, sign = '+';
}
if (sign == '-') /* get final value */
x = 0 - x;
if (endptr != 0)
*endptr = (char *)sc;
return (x);
}
_CRTIMP2_PURE unsigned long __CLRCALL_PURE_OR_CDECL _Stoul(const char *s, char **endptr, int base)
{ /* convert string, discard error code */
return (_Stoulx(s, endptr, base, 0));
}
_C_STD_END
/*
* Copyright (c) 1992-2006 by P.J. Plauger. ALL RIGHTS RESERVED.
* Consult your license regarding permissions and restrictions.
V5.02:0009 */