icuSources/common/ustrfmt.c

   1 /*
   2 **********************************************************************
   3 *   Copyright (C) 2001-2004, International Business Machines
   4 *   Corporation and others.  All Rights Reserved.
   5 **********************************************************************
   6 */
   7
   8 #include "cstring.h"
   9 #include "ustrfmt.h"
  10 #include <stdio.h>
  11
  12 U_CAPI char*  U_EXPORT2
  13 uprv_dtostr(double value, char *buffer, int maximumDigits,UBool fixedPoint)
  14 {
  15     char *itrPtr = buffer + 1;  /* skip '-' or a number before the decimal */
  16     char *startPtr;
  17
  18     sprintf(buffer,"%f",value);
  19
  20     /* Find the decimal point.
  21        Some unusal machines use a comma when the system locale changes
  22     */
  23     while (isalnum(*itrPtr)) {
  24         itrPtr++;
  25     }
  26     *itrPtr = '.';
  27
  28     /* truncate trailing zeros, except the one after '.' */
  29     startPtr = itrPtr + 1;
  30     itrPtr = uprv_strchr(startPtr, 0);
  31     while(--itrPtr > startPtr){
  32         if(*itrPtr == '0'){
  33             *itrPtr = 0;
  34         }else{
  35             break;
  36         }
  37     }
  38     return buffer;
  39 }
  40
  41 /***
  42  * Fills in a UChar* string with the radix-based representation of a
  43  * uint32_t number padded with zeroes to minwidth.  The result
  44  * will be null terminated if there is room.
  45  *
  46  * @param buffer UChar buffer to receive result
  47  * @param capacity capacity of buffer
  48  * @param i the unsigned number to be formatted
  49  * @param radix the radix from 2..36
  50  * @param minwidth the minimum width.  If the result is narrower than
  51  *        this, '0's will be added on the left.  Must be <=
  52  *        capacity.
  53  * @return the length of the result, not including any terminating
  54  *        null
  55  */
  56 U_CAPI int32_t U_EXPORT2
  57 uprv_itou (UChar * buffer, int32_t capacity,
  58            uint32_t i, uint32_t radix, int32_t minwidth)
  59 {
  60     int32_t length = 0;
  61     int digit;
  62     int32_t j;
  63     UChar temp;
  64
  65     do{
  66         digit = (int)(i % radix);
  67         buffer[length++]=(UChar)(digit<=9?(0x0030+digit):(0x0030+digit+7));
  68         i=i/radix;
  69     } while(i && length<capacity);
  70
  71     while (length < minwidth){
  72         buffer[length++] = (UChar) 0x0030;/*zero padding */
  73     }
  74     /* null terminate the buffer */
  75     if(length<capacity){
  76         buffer[length] = (UChar) 0x0000;
  77     }
  78
  79     /* Reverses the string */
  80     for (j = 0; j < (length / 2); j++){
  81         temp = buffer[(length-1) - j];
  82         buffer[(length-1) - j] = buffer[j];
  83         buffer[j] = temp;
  84     }
  85     return length;
  86 }