Check in the pristine copy of ICU 4.6...

icu46/source/io/ustream.cpp

+/*
+**********************************************************************
+*   Copyright (C) 2001-2010, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+**********************************************************************
+*  FILE NAME : ustream.cpp
+*
+*   Modification History:
+*
+*   Date        Name        Description
+*   06/25/2001  grhoten     Move iostream from unistr.h to here
+******************************************************************************
+*/
+
+
+#include "unicode/utypes.h"
+#include "unicode/uobject.h"
+#include "unicode/ustream.h"
+#include "unicode/ucnv.h"
+#include "unicode/uchar.h"
+#include "ustr_cnv.h"
+#include "cmemory.h"
+#include <string.h>
+
+// console IO
+
+#if U_IOSTREAM_SOURCE >= 198506
+
+#if U_IOSTREAM_SOURCE >= 199711
+#define STD_NAMESPACE std::
+#else
+#define STD_NAMESPACE
+#endif
+
+#define STD_OSTREAM STD_NAMESPACE ostream
+#define STD_ISTREAM STD_NAMESPACE istream
+
+U_NAMESPACE_BEGIN
+
+U_IO_API STD_OSTREAM & U_EXPORT2
+operator<<(STD_OSTREAM& stream, const UnicodeString& str)
+{
+    if(str.length() > 0) {
+        char buffer[200];
+        UConverter *converter;
+        UErrorCode errorCode = U_ZERO_ERROR;
+
+        // use the default converter to convert chunks of text
+        converter = u_getDefaultConverter(&errorCode);
+        if(U_SUCCESS(errorCode)) {
+            const UChar *us = str.getBuffer();
+            const UChar *uLimit = us + str.length();
+            char *s, *sLimit = buffer + (sizeof(buffer) - 1);
+            do {
+                errorCode = U_ZERO_ERROR;
+                s = buffer;
+                ucnv_fromUnicode(converter, &s, sLimit, &us, uLimit, 0, FALSE, &errorCode);
+                *s = 0;
+
+                // write this chunk
+                if(s > buffer) {
+                    stream << buffer;
+                }
+            } while(errorCode == U_BUFFER_OVERFLOW_ERROR);
+            u_releaseDefaultConverter(converter);
+        }
+    }
+
+/*    stream.flush();*/
+    return stream;
+}
+
+U_IO_API STD_ISTREAM & U_EXPORT2
+operator>>(STD_ISTREAM& stream, UnicodeString& str)
+{
+    // This is like ICU status checking.
+    if (stream.fail()) {
+        return stream;
+    }
+
+    /* ipfx should eat whitespace when ios::skipws is set */
+    UChar uBuffer[16];
+    char buffer[16];
+    int32_t idx = 0;
+    UConverter *converter;
+    UErrorCode errorCode = U_ZERO_ERROR;
+
+    // use the default converter to convert chunks of text
+    converter = u_getDefaultConverter(&errorCode);
+    if(U_SUCCESS(errorCode)) {
+        UChar *us = uBuffer;
+        const UChar *uLimit = uBuffer + sizeof(uBuffer)/sizeof(*uBuffer);
+        const char *s, *sLimit;
+        char ch;
+        UChar ch32;
+        UBool initialWhitespace = TRUE;
+        UBool continueReading = TRUE;
+
+        /* We need to consume one byte at a time to see what is considered whitespace. */
+        while (continueReading) {
+            ch = stream.get();
+            if (stream.eof()) {
+                // The EOF is only set after the get() of an unavailable byte.
+                if (!initialWhitespace) {
+                    stream.clear(stream.eofbit);
+                }
+                continueReading = FALSE;
+            }
+            sLimit = &ch + (int)continueReading;
+            us = uBuffer;
+            s = &ch;
+            errorCode = U_ZERO_ERROR;
+            /*
+            Since we aren't guaranteed to see the state before this call,
+            this code won't work on stateful encodings like ISO-2022 or an EBCDIC stateful encoding.
+            We flush on the last byte to ensure that we output truncated multibyte characters.
+            */
+            ucnv_toUnicode(converter, &us, uLimit, &s, sLimit, 0, !continueReading, &errorCode);
+            if(U_FAILURE(errorCode)) {
+                /* Something really bad happened. setstate() isn't always an available API */
+                stream.clear(stream.failbit);
+                goto STOP_READING;
+            }
+            /* Was the character consumed? */
+            if (us != uBuffer) {
+                /* Reminder: ibm-1390 & JISX0213 can output 2 Unicode code points */
+                int32_t uBuffSize = us-uBuffer;
+                int32_t uBuffIdx = 0;
+                while (uBuffIdx < uBuffSize) {
+                    U16_NEXT(uBuffer, uBuffIdx, uBuffSize, ch32);
+                    if (u_isWhitespace(ch32)) {
+                        if (!initialWhitespace) {
+                            buffer[idx++] = ch;
+                            while (idx > 0) {
+                                stream.putback(buffer[--idx]);
+                            }
+                            goto STOP_READING;
+                        }
+                        /* else skip intialWhitespace */
+                    }
+                    else {
+                        if (initialWhitespace) {
+                            /*
+                            When initialWhitespace is TRUE, we haven't appended any
+                            character yet.  This is where we truncate the string,
+                            to avoid modifying the string before we know if we can
+                            actually read from the stream.
+                            */
+                            str.truncate(0);
+                            initialWhitespace = FALSE;
+                        }
+                        str.append(ch32);
+                    }
+                }
+                idx = 0;
+            }
+            else {
+                buffer[idx++] = ch;
+            }
+        }
+STOP_READING:
+        u_releaseDefaultConverter(converter);
+    }
+
+/*    stream.flush();*/
+    return stream;
+}
+
+U_NAMESPACE_END
+
+#endif
+