icuSources/common/ustrfmt.cpp

   1 // © 2016 and later: Unicode, Inc. and others.
   2 // License & terms of use: http://www.unicode.org/copyright.html
   3 /*
   4 **********************************************************************
   5 *   Copyright (C) 2001-2006, International Business Machines
   6 *   Corporation and others.  All Rights Reserved.
   7 **********************************************************************
   8 */
   9
  10 #include "cstring.h"
  11 #include "ustrfmt.h"
  12
  13
  14 /***
  15  * Fills in a UChar* string with the radix-based representation of a
  16  * uint32_t number padded with zeroes to minwidth.  The result
  17  * will be null terminated if there is room.
  18  *
  19  * @param buffer UChar buffer to receive result
  20  * @param capacity capacity of buffer
  21  * @param i the unsigned number to be formatted
  22  * @param radix the radix from 2..36
  23  * @param minwidth the minimum width.  If the result is narrower than
  24  *        this, '0's will be added on the left.  Must be <=
  25  *        capacity.
  26  * @return the length of the result, not including any terminating
  27  *        null
  28  */
  29 U_CAPI int32_t U_EXPORT2
  30 uprv_itou (UChar * buffer, int32_t capacity,
  31            uint32_t i, uint32_t radix, int32_t minwidth)
  32 {
  33     int32_t length = 0;
  34     int digit;
  35     int32_t j;
  36     UChar temp;
  37
  38     do{
  39         digit = (int)(i % radix);
  40         buffer[length++]=(UChar)(digit<=9?(0x0030+digit):(0x0030+digit+7));
  41         i=i/radix;
  42     } while(i && length<capacity);
  43
  44     while (length < minwidth){
  45         buffer[length++] = (UChar) 0x0030;/*zero padding */
  46     }
  47     /* null terminate the buffer */
  48     if(length<capacity){
  49         buffer[length] = (UChar) 0x0000;
  50     }
  51
  52     /* Reverses the string */
  53     for (j = 0; j < (length / 2); j++){
  54         temp = buffer[(length-1) - j];
  55         buffer[(length-1) - j] = buffer[j];
  56         buffer[j] = temp;
  57     }
  58     return length;
  59 }