icuSources/io/ustream.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) 2001-2016, International Business Machines
   6 *   Corporation and others.  All Rights Reserved.
   7 **********************************************************************
   8 *  FILE NAME : ustream.cpp
   9 *
  10 *   Modification History:
  11 *
  12 *   Date        Name        Description
  13 *   06/25/2001  grhoten     Move iostream from unistr.h to here
  14 ******************************************************************************
  15 */
  16
  17 #include "unicode/utypes.h"
  18
  19 #if !UCONFIG_NO_CONVERSION
  20
  21 #include "unicode/uobject.h"
  22 #include "unicode/ustream.h"
  23 #include "unicode/ucnv.h"
  24 #include "unicode/uchar.h"
  25 #include "unicode/utf16.h"
  26 #include "ustr_cnv.h"
  27 #include "cmemory.h"
  28 #include <string.h>
  29
  30 // console IO
  31
  32 #define STD_NAMESPACE std::
  33
  34 #define STD_OSTREAM STD_NAMESPACE ostream
  35 #define STD_ISTREAM STD_NAMESPACE istream
  36
  37 U_NAMESPACE_BEGIN
  38
  39 U_IO_API STD_OSTREAM & U_EXPORT2
  40 operator<<(STD_OSTREAM& stream, const UnicodeString& str)
  41 {
  42     if(str.length() > 0) {
  43         char buffer[200];
  44         UConverter *converter;
  45         UErrorCode errorCode = U_ZERO_ERROR;
  46
  47         // use the default converter to convert chunks of text
  48         converter = u_getDefaultConverter(&errorCode);
  49         if(U_SUCCESS(errorCode)) {
  50             const UChar *us = str.getBuffer();
  51             const UChar *uLimit = us + str.length();
  52             char *s, *sLimit = buffer + (sizeof(buffer) - 1);
  53             do {
  54                 errorCode = U_ZERO_ERROR;
  55                 s = buffer;
  56                 ucnv_fromUnicode(converter, &s, sLimit, &us, uLimit, 0, FALSE, &errorCode);
  57                 *s = 0;
  58
  59                 // write this chunk
  60                 if(s > buffer) {
  61                     stream << buffer;
  62                 }
  63             } while(errorCode == U_BUFFER_OVERFLOW_ERROR);
  64             u_releaseDefaultConverter(converter);
  65         }
  66     }
  67
  68 /*    stream.flush();*/
  69     return stream;
  70 }
  71
  72 U_IO_API STD_ISTREAM & U_EXPORT2
  73 operator>>(STD_ISTREAM& stream, UnicodeString& str)
  74 {
  75     // This is like ICU status checking.
  76     if (stream.fail()) {
  77         return stream;
  78     }
  79
  80     /* ipfx should eat whitespace when ios::skipws is set */
  81     UChar uBuffer[16];
  82     char buffer[16];
  83     int32_t idx = 0;
  84     UConverter *converter;
  85     UErrorCode errorCode = U_ZERO_ERROR;
  86
  87     // use the default converter to convert chunks of text
  88     converter = u_getDefaultConverter(&errorCode);
  89     if(U_SUCCESS(errorCode)) {
  90         UChar *us = uBuffer;
  91         const UChar *uLimit = uBuffer + UPRV_LENGTHOF(uBuffer);
  92         const char *s, *sLimit;
  93         char ch;
  94         UChar ch32;
  95         UBool initialWhitespace = TRUE;
  96         UBool continueReading = TRUE;
  97
  98         /* We need to consume one byte at a time to see what is considered whitespace. */
  99         while (continueReading) {
 100             ch = stream.get();
 101             if (stream.eof()) {
 102                 // The EOF is only set after the get() of an unavailable byte.
 103                 if (!initialWhitespace) {
 104                     stream.clear(stream.eofbit);
 105                 }
 106                 continueReading = FALSE;
 107             }
 108             sLimit = &ch + (int)continueReading;
 109             us = uBuffer;
 110             s = &ch;
 111             errorCode = U_ZERO_ERROR;
 112             /*
 113             Since we aren't guaranteed to see the state before this call,
 114             this code won't work on stateful encodings like ISO-2022 or an EBCDIC stateful encoding.
 115             We flush on the last byte to ensure that we output truncated multibyte characters.
 116             */
 117             ucnv_toUnicode(converter, &us, uLimit, &s, sLimit, 0, !continueReading, &errorCode);
 118             if(U_FAILURE(errorCode)) {
 119                 /* Something really bad happened. setstate() isn't always an available API */
 120                 stream.clear(stream.failbit);
 121                 goto STOP_READING;
 122             }
 123             /* Was the character consumed? */
 124             if (us != uBuffer) {
 125                 /* Reminder: ibm-1390 & JISX0213 can output 2 Unicode code points */
 126                 int32_t uBuffSize = static_cast<int32_t>(us-uBuffer);
 127                 int32_t uBuffIdx = 0;
 128                 while (uBuffIdx < uBuffSize) {
 129                     U16_NEXT(uBuffer, uBuffIdx, uBuffSize, ch32);
 130                     if (u_isWhitespace(ch32)) {
 131                         if (!initialWhitespace) {
 132                             buffer[idx++] = ch;
 133                             while (idx > 0) {
 134                                 stream.putback(buffer[--idx]);
 135                             }
 136                             goto STOP_READING;
 137                         }
 138                         /* else skip intialWhitespace */
 139                     }
 140                     else {
 141                         if (initialWhitespace) {
 142                             /*
 143                             When initialWhitespace is TRUE, we haven't appended any
 144                             character yet.  This is where we truncate the string,
 145                             to avoid modifying the string before we know if we can
 146                             actually read from the stream.
 147                             */
 148                             str.truncate(0);
 149                             initialWhitespace = FALSE;
 150                         }
 151                         str.append(ch32);
 152                     }
 153                 }
 154                 idx = 0;
 155             }
 156             else {
 157                 buffer[idx++] = ch;
 158             }
 159         }
 160 STOP_READING:
 161         u_releaseDefaultConverter(converter);
 162     }
 163
 164 /*    stream.flush();*/
 165     return stream;
 166 }
 167
 168 U_NAMESPACE_END
 169
 170 #endif