117 lines
2.9 KiB
C
117 lines
2.9 KiB
C
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/* _Stoul function */
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#include <stdlib.h>
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#include <ctype.h>
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#include <errno.h>
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#include <limits.h>
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#include <stddef.h>
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#include <string.h>
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#include "xmath.h"
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#pragma warning(disable: 4701)
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#if (ULONG_MAX >> 16) >> 16 != 0xffffffff && ULONG_MAX != 0xffffffff
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#error LONGS TOO LARGE FOR _Stoul
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#endif /* longs too large */
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_C_STD_BEGIN
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/* macros */
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#define BASE_MAX 36 /* largest valid base */
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/* static data */
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static const char digits[] = /* valid digits */
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"0123456789abcdefghijklmnopqrstuvwxyz";
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#if (ULONG_MAX >> 16) >> 16 == 0xffffffff
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static const char ndigs[BASE_MAX + 1] = { /* 64-bits! */
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0, 0, 65, 41, 33, 28, 25, 23, 22, 21,
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20, 19, 18, 18, 17, 17, 17, 16, 16, 16,
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15, 15, 15, 15, 14, 14, 14, 14, 14, 14,
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14, 13, 13, 13, 13, 13, 13,};
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#else /* (ULONG_MAX >> 16) >> 16 == 0xffffffff */
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static const char ndigs[BASE_MAX+1] = { /* 32-bits! */
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0, 0, 33, 21, 17, 14, 13, 12, 11, 11,
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10, 10, 9, 9, 9, 9, 9, 8, 8, 8,
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8, 8, 8, 8, 7, 7, 7, 7, 7, 7,
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7, 7, 7, 7, 7, 7, 7,};
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#endif /* (ULONG_MAX >> 16) >> 16 == 0xffffffff */
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#if defined(__cplusplus) && !defined(MRTDLL)
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extern "C"
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#endif
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_CRTIMP2_PURE unsigned long __CLRCALL_PURE_OR_CDECL _Stoulx(const char *s, char **endptr,
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int base, int *perr)
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{ /* convert string to unsigned long, with checking */
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const char *sc, *sd;
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const char *s1, *s2;
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char dig, sign;
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ptrdiff_t n;
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unsigned long x, y;
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if (perr != 0)
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*perr = 0;
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for (sc = s; isspace((unsigned char)*sc); ++sc)
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;
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sign = *sc == '-' || *sc == '+' ? *sc++ : '+';
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if (base < 0 || base == 1 || BASE_MAX < base)
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{ /* silly base */
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if (endptr != 0)
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*endptr = (char *)s;
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return (0);
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}
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else if (0 < base)
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{ /* strip 0x or 0X */
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if (base == 16 && *sc == '0'
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&& (sc[1] == 'x' || sc[1] == 'X'))
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sc += 2;
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}
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else if (*sc != '0')
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base = 10;
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else if (sc[1] == 'x' || sc[1] == 'X')
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base = 16, sc += 2;
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else
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base = 8;
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for (s1 = sc; *sc == '0'; ++sc)
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; /* skip leading zeros */
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x = 0;
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for (s2 = sc, y = 0; (sd = (char *)memchr(&digits[0],
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tolower(*sc), base)) != 0; ++sc)
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{ /* accumulate digits */
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y = x;
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dig = (char)(sd - digits); /* for overflow checking */
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x = x * base + dig;
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}
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if (s1 == sc)
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{ /* check string validity */
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if (endptr != 0)
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*endptr = (char *)s;
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return (0);
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}
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n = sc - s2 - ndigs[base];
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if (n < 0)
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;
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else if (0 < n || x < x - dig || (x - dig) / base != y)
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{ /* overflow */
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errno = ERANGE;
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if (perr != 0)
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*perr = 1;
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x = ULONG_MAX, sign = '+';
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}
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if (sign == '-') /* get final value */
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x = 0 - x;
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if (endptr != 0)
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*endptr = (char *)sc;
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return (x);
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}
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_CRTIMP2_PURE unsigned long __CLRCALL_PURE_OR_CDECL _Stoul(const char *s, char **endptr, int base)
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{ /* convert string, discard error code */
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return (_Stoulx(s, endptr, base, 0));
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}
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_C_STD_END
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/*
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* Copyright (c) 1992-2006 by P.J. Plauger. ALL RIGHTS RESERVED.
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* Consult your license regarding permissions and restrictions.
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V5.02:0009 */
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