icuSources/common/ustrfmt.c

   1 /*
   2 **********************************************************************
   3 *   Copyright (C) 2001-2006, International Business Machines
   4 *   Corporation and others.  All Rights Reserved.
   5 **********************************************************************
   6 */
   7
   8 #include "cstring.h"
   9 #include "ustrfmt.h"
  10
  11
  12 /***
  13  * Fills in a UChar* string with the radix-based representation of a
  14  * uint32_t number padded with zeroes to minwidth.  The result
  15  * will be null terminated if there is room.
  16  *
  17  * @param buffer UChar buffer to receive result
  18  * @param capacity capacity of buffer
  19  * @param i the unsigned number to be formatted
  20  * @param radix the radix from 2..36
  21  * @param minwidth the minimum width.  If the result is narrower than
  22  *        this, '0's will be added on the left.  Must be <=
  23  *        capacity.
  24  * @return the length of the result, not including any terminating
  25  *        null
  26  */
  27 U_CAPI int32_t U_EXPORT2
  28 uprv_itou (UChar * buffer, int32_t capacity,
  29            uint32_t i, uint32_t radix, int32_t minwidth)
  30 {
  31     int32_t length = 0;
  32     int digit;
  33     int32_t j;
  34     UChar temp;
  35
  36     do{
  37         digit = (int)(i % radix);
  38         buffer[length++]=(UChar)(digit<=9?(0x0030+digit):(0x0030+digit+7));
  39         i=i/radix;
  40     } while(i && length<capacity);
  41
  42     while (length < minwidth){
  43         buffer[length++] = (UChar) 0x0030;/*zero padding */
  44     }
  45     /* null terminate the buffer */
  46     if(length<capacity){
  47         buffer[length] = (UChar) 0x0000;
  48     }
  49
  50     /* Reverses the string */
  51     for (j = 0; j < (length / 2); j++){
  52         temp = buffer[(length-1) - j];
  53         buffer[(length-1) - j] = buffer[j];
  54         buffer[j] = temp;
  55     }
  56     return length;
  57 }