Mercurial > vba-linux

     1 // Common/StringToInt.cpp

     2 

     3 #include "StdAfx.h"

     4 

     5 #include "StringToInt.h"

     6 

     7 UInt64 ConvertStringToUInt64(const char *s, const char **end)

     8 {

     9   UInt64 result = 0;

    10   for (;;)

    11   {

    12     char c = *s;

    13     if (c < '0' || c > '9')

    14     {

    15       if (end != NULL)

    16         *end = s;

    17       return result;

    18     }

    19     result *= 10;

    20     result += (c - '0');

    21     s++;

    22   }

    23 }

    24 

    25 UInt64 ConvertOctStringToUInt64(const char *s, const char **end)

    26 {

    27   UInt64 result = 0;

    28   for (;;)

    29   {

    30     char c = *s;

    31     if (c < '0' || c > '7')

    32     {

    33       if (end != NULL)

    34         *end = s;

    35       return result;

    36     }

    37     result <<= 3;

    38     result += (c - '0');

    39     s++;

    40   }

    41 }

    42 

    43 UInt64 ConvertHexStringToUInt64(const char *s, const char **end)

    44 {

    45   UInt64 result = 0;

    46   for (;;)

    47   {

    48     char c = *s;

    49     UInt32 v;

    50     if (c >= '0' && c <= '9') v = (c - '0');

    51     else if (c >= 'A' && c <= 'F') v = 10 + (c - 'A');

    52     else if (c >= 'a' && c <= 'f') v = 10 + (c - 'a');

    53     else

    54     {

    55       if (end != NULL)

    56         *end = s;

    57       return result;

    58     }

    59     result <<= 4;

    60     result |= v;

    61     s++;

    62   }

    63 }

    64 

    65 

    66 UInt64 ConvertStringToUInt64(const wchar_t *s, const wchar_t **end)

    67 {

    68   UInt64 result = 0;

    69   for (;;)

    70   {

    71     wchar_t c = *s;

    72     if (c < '0' || c > '9')

    73     {

    74       if (end != NULL)

    75         *end = s;

    76       return result;

    77     }

    78     result *= 10;

    79     result += (c - '0');

    80     s++;

    81   }

    82 }

    83 

    84 

    85 Int64 ConvertStringToInt64(const char *s, const char **end)

    86 {

    87   if (*s == '-')

    88     return -(Int64)ConvertStringToUInt64(s + 1, end);

    89   return ConvertStringToUInt64(s, end);

    90 }
author	Robert McIntyre <rlm@mit.edu>
date	Sat, 03 Mar 2012 10:31:27 -0600
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