icuSources/io/ustream.cpp

   1 /*
   2 **********************************************************************
   3 *   Copyright (C) 2001-2010, International Business Machines
   4 *   Corporation and others.  All Rights Reserved.
   5 **********************************************************************
   6 *  FILE NAME : ustream.cpp
   7 *
   8 *   Modification History:
   9 *
  10 *   Date        Name        Description
  11 *   06/25/2001  grhoten     Move iostream from unistr.h to here
  12 ******************************************************************************
  13 */
  14
  15
  16 #include "unicode/utypes.h"
  17 #include "unicode/uobject.h"
  18 #include "unicode/ustream.h"
  19 #include "unicode/ucnv.h"
  20 #include "unicode/uchar.h"
  21 #include "ustr_cnv.h"
  22 #include "cmemory.h"
  23 #include <string.h>
  24
  25 // console IO
  26
  27 #if U_IOSTREAM_SOURCE >= 198506
  28
  29 #if U_IOSTREAM_SOURCE >= 199711
  30 #define STD_NAMESPACE std::
  31 #else
  32 #define STD_NAMESPACE
  33 #endif
  34
  35 #define STD_OSTREAM STD_NAMESPACE ostream
  36 #define STD_ISTREAM STD_NAMESPACE istream
  37
  38 U_NAMESPACE_BEGIN
  39
  40 U_IO_API STD_OSTREAM & U_EXPORT2
  41 operator<<(STD_OSTREAM& stream, const UnicodeString& str)
  42 {
  43     if(str.length() > 0) {
  44         char buffer[200];
  45         UConverter *converter;
  46         UErrorCode errorCode = U_ZERO_ERROR;
  47
  48         // use the default converter to convert chunks of text
  49         converter = u_getDefaultConverter(&errorCode);
  50         if(U_SUCCESS(errorCode)) {
  51             const UChar *us = str.getBuffer();
  52             const UChar *uLimit = us + str.length();
  53             char *s, *sLimit = buffer + (sizeof(buffer) - 1);
  54             do {
  55                 errorCode = U_ZERO_ERROR;
  56                 s = buffer;
  57                 ucnv_fromUnicode(converter, &s, sLimit, &us, uLimit, 0, FALSE, &errorCode);
  58                 *s = 0;
  59
  60                 // write this chunk
  61                 if(s > buffer) {
  62                     stream << buffer;
  63                 }
  64             } while(errorCode == U_BUFFER_OVERFLOW_ERROR);
  65             u_releaseDefaultConverter(converter);
  66         }
  67     }
  68
  69 /*    stream.flush();*/
  70     return stream;
  71 }
  72
  73 U_IO_API STD_ISTREAM & U_EXPORT2
  74 operator>>(STD_ISTREAM& stream, UnicodeString& str)
  75 {
  76     // This is like ICU status checking.
  77     if (stream.fail()) {
  78         return stream;
  79     }
  80
  81     /* ipfx should eat whitespace when ios::skipws is set */
  82     UChar uBuffer[16];
  83     char buffer[16];
  84     int32_t idx = 0;
  85     UConverter *converter;
  86     UErrorCode errorCode = U_ZERO_ERROR;
  87
  88     // use the default converter to convert chunks of text
  89     converter = u_getDefaultConverter(&errorCode);
  90     if(U_SUCCESS(errorCode)) {
  91         UChar *us = uBuffer;
  92         const UChar *uLimit = uBuffer + sizeof(uBuffer)/sizeof(*uBuffer);
  93         const char *s, *sLimit;
  94         char ch;
  95         UChar ch32;
  96         UBool initialWhitespace = TRUE;
  97         UBool continueReading = TRUE;
  98
  99         /* We need to consume one byte at a time to see what is considered whitespace. */
 100         while (continueReading) {
 101             ch = stream.get();
 102             if (stream.eof()) {
 103                 // The EOF is only set after the get() of an unavailable byte.
 104                 if (!initialWhitespace) {
 105                     stream.clear(stream.eofbit);
 106                 }
 107                 continueReading = FALSE;
 108             }
 109             sLimit = &ch + (int)continueReading;
 110             us = uBuffer;
 111             s = &ch;
 112             errorCode = U_ZERO_ERROR;
 113             /*
 114             Since we aren't guaranteed to see the state before this call,
 115             this code won't work on stateful encodings like ISO-2022 or an EBCDIC stateful encoding.
 116             We flush on the last byte to ensure that we output truncated multibyte characters.
 117             */
 118             ucnv_toUnicode(converter, &us, uLimit, &s, sLimit, 0, !continueReading, &errorCode);
 119             if(U_FAILURE(errorCode)) {
 120                 /* Something really bad happened. setstate() isn't always an available API */
 121                 stream.clear(stream.failbit);
 122                 goto STOP_READING;
 123             }
 124             /* Was the character consumed? */
 125             if (us != uBuffer) {
 126                 /* Reminder: ibm-1390 & JISX0213 can output 2 Unicode code points */
 127                 int32_t uBuffSize = us-uBuffer;
 128                 int32_t uBuffIdx = 0;
 129                 while (uBuffIdx < uBuffSize) {
 130                     U16_NEXT(uBuffer, uBuffIdx, uBuffSize, ch32);
 131                     if (u_isWhitespace(ch32)) {
 132                         if (!initialWhitespace) {
 133                             buffer[idx++] = ch;
 134                             while (idx > 0) {
 135                                 stream.putback(buffer[--idx]);
 136                             }
 137                             goto STOP_READING;
 138                         }
 139                         /* else skip intialWhitespace */
 140                     }
 141                     else {
 142                         if (initialWhitespace) {
 143                             /*
 144                             When initialWhitespace is TRUE, we haven't appended any
 145                             character yet.  This is where we truncate the string,
 146                             to avoid modifying the string before we know if we can
 147                             actually read from the stream.
 148                             */
 149                             str.truncate(0);
 150                             initialWhitespace = FALSE;
 151                         }
 152                         str.append(ch32);
 153                     }
 154                 }
 155                 idx = 0;
 156             }
 157             else {
 158                 buffer[idx++] = ch;
 159             }
 160         }
 161 STOP_READING:
 162         u_releaseDefaultConverter(converter);
 163     }
 164
 165 /*    stream.flush();*/
 166     return stream;
 167 }
 168
 169 U_NAMESPACE_END
 170
 171 #endif
 172