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# xtoa.cpp

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    00001 // $Header: /local/reps/Gaudi/GaudiKernel/src/Lib/xtoa.cpp,v 1.3 2003/11/27 10:20:59 mato Exp $
    00002 #if !defined(_WIN32)
    00003 #include <stdlib.h>
    00004 #include <limits.h>
    00005 #include "GaudiKernel/xtoa.h"
    00006
    00007 /***
    00008 *xtoa.c - convert integers/longs to ASCII string
    00009 *
    00010 *   Copyright (c) 1989-1997, Microsoft Corporation. All rights reserved.
    00011 *
    00012 *Purpose:
    00013 *   The module has code to convert integers/longs to ASCII strings.  See
    00014 *
    00015 *******************************************************************************/
    00016
    00017 /***
    00018 *char *_itoa, *_ltoa, *_ultoa(val, buf, radix) - convert binary int to ASCII
    00019 *   string
    00020 *
    00021 *Purpose:
    00022 *   Converts an int to a character string.
    00023 *
    00024 *Entry:
    00025 *   val - number to be converted (int, long or unsigned long)
    00026 *   int radix - base to convert into
    00027 *   char *buf - ptr to buffer to place result
    00028 *
    00029 *Exit:
    00030 *   fills in space pointed to by buf with string result
    00031 *   returns a pointer to this buffer
    00032 *
    00033 *Exceptions:
    00034 *
    00035 *******************************************************************************/
    00036
    00037 /* helper routine that does the main job. */
    00038
    00039 static void __cdecl xtoa (unsigned long val,char *buf,unsigned radix,int is_neg)  {
    00040   char *p;    /* pointer to traverse string */
    00041   char *firstdig;   /* pointer to first digit */
    00042   char temp;    /* temp char */
    00043   unsigned digval;  /* value of digit */
    00044
    00045   p = buf;
    00046
    00047   if (is_neg) {
    00048     /* negative, so output '-' and negate */
    00049     *p++ = '-';
    00050     val = (unsigned long)(-(long)val);
    00051   }
    00052
    00053   firstdig = p;     /* save pointer to first digit */
    00054
    00055   do {
    00056     digval = (unsigned) (val % radix);
    00057     val /= radix;   /* get next digit */
    00058
    00059     /* convert to ascii and store */
    00060     if (digval > 9)
    00061       *p++ = (char) (digval - 10 + 'a');  /* a letter */
    00062     else
    00063       *p++ = (char) (digval + '0');       /* a digit */
    00064   } while (val > 0);
    00065
    00066   /* We now have the digit of the number in the buffer, but in reverse
    00067      order.  Thus we reverse them now. */
    00068
    00069   *p-- = '\0';    /* terminate string; p points to last digit */
    00070
    00071   do {
    00072     temp = *p;
    00073     *p = *firstdig;
    00074     *firstdig = temp;   /* swap *p and *firstdig */
    00075     --p;
    00076     ++firstdig;   /* advance to next two digits */
    00077   } while (firstdig < p); /* repeat until halfway */
    00078 }
    00079
    00080 /* Actual functions just call conversion helper with neg flag set correctly,
    00081    and return pointer to buffer. */
    00082
    00083 extern "C" char * __cdecl _itoa (int val,char *buf,int radix)    {
    00084   if (radix == 10 && val < 0)
    00085     xtoa((unsigned long)val, buf, radix, 1);
    00086   else
    00087     xtoa((unsigned long)(unsigned int)val, buf, radix, 0);
    00088   return buf;
    00089 }
    00090
    00091 extern "C" char * __cdecl _ltoa (long val,char *buf,int radix)   {
    00092   xtoa((unsigned long)val, buf, radix, (radix == 10 && val < 0));
    00093   return buf;
    00094 }
    00095
    00096 extern "C" char * __cdecl _ultoa (unsigned long val,char *buf,int radix)        {
    00097   xtoa(val, buf, radix, 0);
    00098   return buf;
    00099 }
    00100
    00101 #if 0 // ndef _NO_INT64
    00102
    00103 static void __stdcall x64toa (  /* stdcall is faster and smaller... Might as well use it for the helper. */
    00104   unsigned __int64 val,
    00105   char *buf,
    00106   unsigned radix,
    00107   int is_neg
    00108   )
    00109 {
    00110   char *p;  /* pointer to traverse string */
    00111   char *firstdig;   /* pointer to first digit */
    00112   char temp;  /* temp char */
    00113   unsigned digval;  /* value of digit */
    00114
    00115   p = buf;
    00116
    00117   if ( is_neg )  {
    00118     *p++ = '-';   /* negative, so output '-' and negate */
    00119   }
    00120
    00121   firstdig = p;   /* save pointer to first digit */
    00122
    00123   do {
    00124     digval = (unsigned) (val % radix);
    00125     val /= radix;   /* get next digit */
    00126
    00127     /* convert to ascii and store */
    00128     if (digval > 9)
    00129       *p++ = (char) (digval - 10 + 'a');  /* a letter */
    00130     else
    00131       *p++ = (char) (digval + '0');     /* a digit */
    00132   } while (val > 0);
    00133
    00134   /* We now have the digit of the number in the buffer, but in reverse
    00135    order.  Thus we reverse them now. */
    00136
    00137   *p-- = '\0';  /* terminate string; p points to last digit */
    00138
    00139   do {
    00140     temp = *p;
    00141     *p = *firstdig;
    00142     *firstdig = temp;   /* swap *p and *firstdig */
    00143     --p;
    00144     ++firstdig;   /* advance to next two digits */
    00145   } while (firstdig < p); /* repeat until halfway */
    00146 }
    00147
    00148 /* Actual functions just call conversion helper with neg flag set correctly,
    00149    and return pointer to buffer. */
    00150
    00151 extern "C" char * __cdecl _i64toa (__int64 val,char *buf,int radix )   {
    00152   x64toa((unsigned __int64)val, buf, radix, (radix == 10 && val < 0));
    00153   return buf;
    00154 }
    00155
    00156 extern "C" char * __cdecl i64toa (__int64 val,char *buf,int radix )   {
    00157   x64toa((unsigned __int64)val, buf, radix, (radix == 10 && val < 0));
    00158   return buf;
    00159 }
    00160
    00161 extern "C" char * __cdecl _ui64toa (unsigned __int64 val,char *buf,int radix)    {
    00162   x64toa(val, buf, radix, 0);
    00163   return buf;
    00164 }
    00165
    00166 extern "C" char * __cdecl ui64toa (unsigned __int64 val,char *buf,int radix)    {
    00167   x64toa(val, buf, radix, 0);
    00168   return buf;
    00169 }
    00170
    00171 #endif  /* _NO_INT64 */
    00172
    00173 #endif /* WIN32   */