icuSources/io/ufmt_cmn.c

   1 /*
   2 ******************************************************************************
   3 *
   4 *   Copyright (C) 1998-2004, International Business Machines
   5 *   Corporation and others.  All Rights Reserved.
   6 *
   7 ******************************************************************************
   8 *
   9 * File ufmt_cmn.c
  10 *
  11 * Modification History:
  12 *
  13 *   Date        Name        Description
  14 *   12/02/98    stephen     Creation.
  15 *   03/12/99    stephen     Modified for new C API.
  16 *   03/15/99    stephen     Added defaultCPToUnicode, unicodeToDefaultCP
  17 *   07/19/99    stephen     Fixed bug in defaultCPToUnicode
  18 ******************************************************************************
  19 */
  20
  21 #include "cstring.h"
  22 #include "cmemory.h"
  23 #include "ufmt_cmn.h"
  24 #include "unicode/uchar.h"
  25 #include "unicode/ucnv.h"
  26 #include "ustr_cnv.h"
  27
  28 #define DIGIT_0     0x0030
  29 #define DIGIT_9     0x0039
  30 #define LOWERCASE_A 0x0061
  31 #define UPPERCASE_A 0x0041
  32 #define LOWERCASE_Z 0x007A
  33 #define UPPERCASE_Z 0x005A
  34
  35 int
  36 ufmt_digitvalue(UChar c)
  37 {
  38     if( ((c>=DIGIT_0)&&(c<=DIGIT_9)) ||
  39         ((c>=LOWERCASE_A)&&(c<=LOWERCASE_Z)) ||
  40         ((c>=UPPERCASE_A)&&(c<=UPPERCASE_Z))  )
  41     {
  42       return c - 0x0030 - (c >= 0x0041 ? (c >= 0x0061 ? 39 : 7) : 0);
  43     }
  44     else
  45     {
  46       return -1;
  47     }
  48 }
  49
  50 UBool
  51 ufmt_isdigit(UChar     c,
  52              int32_t     radix)
  53 {
  54     int digitVal = ufmt_digitvalue(c);
  55
  56     return (UBool)(digitVal < radix && digitVal >= 0);
  57 }
  58
  59 #define TO_UC_DIGIT(a) a <= 9 ? (0x0030 + a) : (0x0037 + a)
  60 #define TO_LC_DIGIT(a) a <= 9 ? (0x0030 + a) : (0x0057 + a)
  61
  62 void
  63 ufmt_64tou(UChar     *buffer,
  64           int32_t   *len,
  65           uint64_t  value,
  66           uint8_t  radix,
  67           UBool     uselower,
  68           int32_t   minDigits)
  69 {
  70     int32_t  length = 0;
  71     uint32_t digit;
  72     UChar    *left, *right, temp;
  73
  74     do {
  75         digit = (uint32_t)(value % radix);
  76         value = value / radix;
  77         buffer[length++] = (UChar)(uselower ? TO_LC_DIGIT(digit)
  78             : TO_UC_DIGIT(digit));
  79     } while(value);
  80
  81     /* pad with zeroes to make it minDigits long */
  82     if(minDigits != -1 && length < minDigits) {
  83         while(length < minDigits && length < *len)
  84             buffer[length++] = 0x0030;  /*zero padding */
  85     }
  86
  87     /* reverse the buffer */
  88     left     = buffer;
  89     right = buffer + length;
  90     while(left < --right) {
  91         temp     = *left;
  92         *left++     = *right;
  93         *right     = temp;
  94     }
  95
  96     *len = length;
  97 }
  98
  99 void
 100 ufmt_ptou(UChar    *buffer,
 101           int32_t   *len,
 102           void      *value,
 103           UBool     uselower)
 104 {
 105     int32_t i;
 106     int32_t length = 0;
 107     uint8_t *ptrIdx = (uint8_t *)&value;
 108
 109 #if U_IS_BIG_ENDIAN
 110     for (i = 0; i < (int32_t)sizeof(void *); i++)
 111 #else
 112     for (i = (int32_t)sizeof(void *)-1; i >= 0 ; i--)
 113 #endif
 114     {
 115         uint8_t byteVal = ptrIdx[i];
 116         uint16_t firstNibble = (uint16_t)(byteVal>>4);
 117         uint16_t secondNibble = (uint16_t)(byteVal&0xF);
 118         if (uselower) {
 119             buffer[length++]=TO_LC_DIGIT(firstNibble);
 120             buffer[length++]=TO_LC_DIGIT(secondNibble);
 121         }
 122         else {
 123             buffer[length++]=TO_UC_DIGIT(firstNibble);
 124             buffer[length++]=TO_UC_DIGIT(secondNibble);
 125         }
 126     }
 127
 128     *len = length;
 129 }
 130
 131 int64_t
 132 ufmt_uto64(const UChar     *buffer,
 133           int32_t     *len,
 134           int8_t     radix)
 135 {
 136     const UChar     *limit;
 137     int32_t         count;
 138     int64_t        result;
 139
 140
 141     /* intialize parameters */
 142     limit     = buffer + *len;
 143     count     = 0;
 144     result    = 0;
 145
 146     /* iterate through buffer */
 147     while(ufmt_isdigit(*buffer, radix) && buffer < limit) {
 148
 149         /* read the next digit */
 150         result *= radix;
 151         result += ufmt_digitvalue(*buffer++);
 152
 153         /* increment our count */
 154         ++count;
 155     }
 156
 157     *len = count;
 158     return result;
 159 }
 160
 161 void *
 162 ufmt_utop(const UChar     *buffer,
 163           int32_t     *len)
 164 {
 165     /*
 166     TODO: Fix this code so that it will work with pointers that are 2<=sizeof(void*)<=16
 167     */
 168     const UChar *limit;
 169     int32_t     count;
 170     int64_t     result;
 171
 172
 173     /* intialize parameters */
 174     limit     = buffer + *len;
 175     count     = 0;
 176     result    = 0;
 177
 178     /* iterate through buffer */
 179     /* limit to sixteen iterations since that is the max that an int64_t can contain for pointer work */
 180     while(ufmt_isdigit(*buffer, 16) && buffer < limit) {
 181
 182         /* read the next digit */
 183         result *= 16;
 184         result += ufmt_digitvalue(*buffer++);
 185
 186         /* increment our count */
 187         ++count;
 188     }
 189
 190     *len = count;
 191     return (void *)result;
 192 }
 193
 194 UChar*
 195 ufmt_defaultCPToUnicode(const char *s, int32_t sSize,
 196                         UChar *target, int32_t tSize)
 197 {
 198     UChar *alias;
 199     UErrorCode status = U_ZERO_ERROR;
 200     UConverter *defConverter = u_getDefaultConverter(&status);
 201
 202     if(U_FAILURE(status) || defConverter == 0)
 203         return 0;
 204
 205     if(sSize <= 0) {
 206         sSize = uprv_strlen(s) + 1;
 207     }
 208
 209     /* perform the conversion in one swoop */
 210     if(target != 0) {
 211
 212         alias = target;
 213         ucnv_toUnicode(defConverter, &alias, alias + tSize, &s, s + sSize - 1,
 214             NULL, TRUE, &status);
 215
 216
 217         /* add the null terminator */
 218         *alias = 0x0000;
 219     }
 220
 221     u_releaseDefaultConverter(defConverter);
 222
 223     return target;
 224 }
 225
 226