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