Patch: default file encoding selection

Tom Tromey tromey@cygnus.com
Sun Sep 10 17:25:00 GMT 2000


I'm checking this in.  It changes libgcj so that the correct default
file encoding will be chosen on some platforms (those which support
nl_langinfo(CODESET)).

2000-09-08  Tom Tromey  <tromey@cygnus.com>

	* gnu/gcj/convert/BytesToUnicode.java (getDefaultDecoder): Let
	default decoder use iconv.
	* gnu/gcj/convert/UnicodeToBytes.java (getDefaultEncoder):
	Let default encoder use iconv.
	* configure: Rebuilt.
	* configure.in: Check for nl_langinfo and <langinfo.h>.
	* java/lang/natSystem.cc (file_encoding): New function.
	(DEFAULT_FILE_ENCODING): Define to file_encoding() if possible.

Tom

Index: configure.in
===================================================================
RCS file: /cvs/java/libgcj/libjava/configure.in,v
retrieving revision 1.59
diff -u -r1.59 configure.in
--- configure.in	2000/05/20 20:26:51	1.59
+++ configure.in	2000/09/11 00:08:21
@@ -396,7 +396,8 @@
 else
    AC_CHECK_FUNCS(strerror ioctl select fstat open fsync sleep)
    AC_CHECK_FUNCS(gmtime_r localtime_r readdir_r getpwuid_r getcwd)
-   AC_CHECK_FUNCS(access stat mkdir rename rmdir unlink realpath iconv)
+   AC_CHECK_FUNCS(access stat mkdir rename rmdir unlink realpath)
+   AC_CHECK_FUNCS(iconv nl_langinfo)
    AC_CHECK_FUNCS(inet_aton inet_addr, break)
    AC_CHECK_FUNCS(inet_pton uname inet_ntoa)
    AC_CHECK_FUNCS(backtrace fork execvp pipe)
@@ -665,7 +666,7 @@
 dnl We check for sys/filio.h because Solaris 2.5 defines FIONREAD there.
 dnl On that system, sys/ioctl.h will not include sys/filio.h unless
 dnl BSD_COMP is defined; just including sys/filio.h is simpler.
-AC_CHECK_HEADERS(unistd.h bstring.h sys/time.h sys/types.h fcntl.h sys/ioctl.h sys/filio.h sys/stat.h sys/select.h sys/socket.h netinet/in.h arpa/inet.h netdb.h pwd.h sys/config.h inttypes.h stdint.h)
+AC_CHECK_HEADERS(unistd.h bstring.h sys/time.h sys/types.h fcntl.h sys/ioctl.h sys/filio.h sys/stat.h sys/select.h sys/socket.h netinet/in.h arpa/inet.h netdb.h pwd.h sys/config.h inttypes.h stdint.h langinfo.h)
 dnl We avoid AC_HEADER_DIRENT since we really only care about dirent.h
 dnl for now.  If you change this, you also must update natFile.cc.
 AC_CHECK_HEADERS(dirent.h)
Index: gnu/gcj/convert/BytesToUnicode.java
===================================================================
RCS file: /cvs/java/libgcj/libjava/gnu/gcj/convert/BytesToUnicode.java,v
retrieving revision 1.7
diff -u -r1.7 BytesToUnicode.java
--- BytesToUnicode.java	2000/08/02 19:56:52	1.7
+++ BytesToUnicode.java	2000/09/11 00:08:21
@@ -52,7 +52,14 @@
       }
     catch (Throwable ex)
       {
-	return new Input_8859_1();
+	try
+	  {
+	    return new Input_iconv (System.getProperty ("file.encoding"));
+	  }
+	catch (Throwable ex2)
+	  {
+	    return new Input_8859_1();
+	  }
       }
   }
 
Index: gnu/gcj/convert/UnicodeToBytes.java
===================================================================
RCS file: /cvs/java/libgcj/libjava/gnu/gcj/convert/UnicodeToBytes.java,v
retrieving revision 1.6
diff -u -r1.6 UnicodeToBytes.java
--- UnicodeToBytes.java	2000/08/02 19:56:53	1.6
+++ UnicodeToBytes.java	2000/09/11 00:08:21
@@ -50,7 +50,14 @@
       }
     catch (Throwable ex)
       {
-	return new Output_8859_1();
+	try
+	  {
+	    return new Output_iconv (System.getProperty ("file.encoding"));
+	  }
+	catch (Throwable ex2)
+	  {
+	    return new Output_8859_1();
+	  }
       }
   }
 
Index: include/config.h.in
===================================================================
RCS file: /cvs/java/libgcj/libjava/include/config.h.in,v
retrieving revision 1.24
diff -u -r1.24 config.h.in
--- config.h.in	2000/05/19 17:55:30	1.24
+++ config.h.in	2000/09/11 00:08:22
@@ -230,6 +230,9 @@
 /* Define if you have the mkdir function.  */
 #undef HAVE_MKDIR
 
+/* Define if you have the nl_langinfo function.  */
+#undef HAVE_NL_LANGINFO
+
 /* Define if you have the open function.  */
 #undef HAVE_OPEN
 
@@ -298,6 +301,9 @@
 
 /* Define if you have the <inttypes.h> header file.  */
 #undef HAVE_INTTYPES_H
+
+/* Define if you have the <langinfo.h> header file.  */
+#undef HAVE_LANGINFO_H
 
 /* Define if you have the <netdb.h> header file.  */
 #undef HAVE_NETDB_H
Index: java/io/DataInputStream.java
===================================================================
RCS file: /cvs/java/libgcj/libjava/java/io/DataInputStream.java,v
retrieving revision 1.5
diff -u -r1.5 DataInputStream.java
--- DataInputStream.java	2000/03/07 19:55:26	1.5
+++ DataInputStream.java	2000/09/11 00:08:23
@@ -1,4 +1,4 @@
-/* Copyright (C) 1998, 1999  Free Software Foundation
+/* Copyright (C) 1998, 1999, 2000  Free Software Foundation
 
    This file is part of libgcj.
 
@@ -8,17 +8,26 @@
  
 package java.io;
 
-/**
- * @author Warren Levy <warrenl@cygnus.com>
- * @date October 20, 1998.  
- */
-
 /* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
  * "The Java Language Specification", ISBN 0-201-63451-1
  * plus online API docs for JDK 1.2 beta from http://www.javasoft.com .
  * Status:  Believed complete and correct.
  */
  
+/**
+ * This subclass of <code>FilteredInputStream</code> implements the
+ * <code>DataInput</code> interface that provides method for reading primitive
+ * Java data types from a stream.
+ *
+ * @see DataInput
+ *
+ * @version 0.0
+ *
+ * @author Warren Levy <warrenl@cygnus.com>
+ * @author Aaron M. Renn (arenn@urbanophile.com)
+ * @date October 20, 1998.  
+ */
+
 public class DataInputStream extends FilterInputStream implements DataInput
 {
   // readLine() hack to ensure that an '\r' not followed by an '\n' is
@@ -26,16 +35,51 @@
   // if that char is a '\n'
   boolean ignoreInitialNewline = false;
   
+  /**
+   * This constructor initializes a new <code>DataInputStream</code>
+   * to read from the specified subordinate stream.
+   *
+   * @param in The subordinate <code>InputStream</code> to read from
+   */
   public DataInputStream(InputStream in)
   {
     super(in);
   }
 
+  /**
+   * This method reads bytes from the underlying stream into the specified
+   * byte array buffer.  It will attempt to fill the buffer completely, but
+   * may return a short count if there is insufficient data remaining to be
+   * read to fill the buffer.
+   *
+   * @param b The buffer into which bytes will be read.
+   * 
+   * @return The actual number of bytes read, or -1 if end of stream reached 
+   * before reading any bytes.
+   *
+   * @exception IOException If an error occurs.
+   */
   public final int read(byte[] b) throws IOException
   {
     return super.read(b, 0, b.length);
   }
 
+  /**
+   * This method reads bytes from the underlying stream into the specified
+   * byte array buffer.  It will attempt to read <code>len</code> bytes and
+   * will start storing them at position <code>off</code> into the buffer.
+   * This method can return a short count if there is insufficient data
+   * remaining to be read to complete the desired read length.
+   *
+   * @param b The buffer into which bytes will be read.
+   * @param off The offset into the buffer to start storing bytes.
+   * @param len The requested number of bytes to read.
+   *
+   * @return The actual number of bytes read, or -1 if end of stream reached
+   * before reading any bytes.
+   *
+   * @exception IOException If an error occurs.
+   */
   public final int read(byte[] b, int off, int len) throws IOException
   {
     if (off < 0 || len < 0 || off + len > b.length)
@@ -44,11 +88,42 @@
     return super.read(b, off, len);
   }
 
+  /**
+   * This method reads a Java boolean value from an input stream.  It does
+   * so by reading a single byte of data.  If that byte is zero, then the
+   * value returned is <code>false</code>.  If the byte is non-zero, then
+   * the value returned is <code>true</code>.
+   * <p>
+   * This method can read a <code>boolean</code> written by an object
+   * implementing the <code>writeBoolean()</code> method in the
+   * <code>DataOutput</code> interface. 
+   *
+   * @return The <code>boolean</code> value read
+   *
+   * @exception EOFException If end of file is reached before reading
+   * the boolean
+   * @exception IOException If any other error occurs
+   */
   public final boolean readBoolean() throws IOException
   {
     return (readByte() != 0);
   }
 
+  /**
+   * This method reads a Java byte value from an input stream.  The value
+   * is in the range of -128 to 127.
+   * <p>
+   * This method can read a <code>byte</code> written by an object
+   * implementing the <code>writeByte()</code> method in the
+   * <code>DataOutput</code> interface.
+   *
+   * @return The <code>byte</code> value read
+   *
+   * @exception EOFException If end of file is reached before reading the byte
+   * @exception IOException If any other error occurs
+   *
+   * @see DataOutput
+   */
   public final byte readByte() throws IOException
   {
     int i = read();
@@ -58,26 +133,118 @@
     return (byte) i;
   }
 
+  /**
+   * This method reads a Java <code>char</code> value from an input stream.  
+   * It operates by reading two bytes from the stream and converting them to 
+   * a single 16-bit Java <code>char</code>.  The two bytes are stored most
+   * significant byte first (i.e., "big endian") regardless of the native
+   * host byte ordering. 
+   * <p>
+   * As an example, if <code>byte1</code> and <code>byte2</code>
+   * represent the first and second byte read from the stream
+   * respectively, they will be transformed to a <code>char</code> in
+   * the following manner: 
+   * <p>
+   * <code>(char)(((byte1 & 0xFF) << 8) | (byte2 & 0xFF)</code>
+   * <p>
+   * This method can read a <code>char</code> written by an object
+   * implementing the <code>writeChar()</code> method in the
+   * <code>DataOutput</code> interface. 
+   *
+   * @return The <code>char</code> value read 
+   *
+   * @exception EOFException If end of file is reached before reading the char
+   * @exception IOException If any other error occurs
+   *
+   * @see DataOutput
+   */
   public final char readChar() throws IOException
   {
     return (char) ((readByte() << 8) | readUnsignedByte());
   }
 
+  /**
+   * This method reads a Java double value from an input stream.  It operates
+   * by first reading a <code>long</code> value from the stream by calling the
+   * <code>readLong()</code> method in this interface, then converts
+   * that <code>long</code> to a <code>double</code> using the
+   * <code>longBitsToDouble</code> method in the class
+   * <code>java.lang.Double</code> 
+   * <p>
+   * This method can read a <code>double</code> written by an object
+   * implementing the <code>writeDouble()</code> method in the
+   * <code>DataOutput</code> interface.
+   *
+   * @return The <code>double</code> value read
+   *
+   * @exception EOFException If end of file is reached before reading
+   * the double
+   * @exception IOException If any other error occurs
+   *
+   * @see java.lang.Double
+   * @see DataOutput
+   */
   public final double readDouble() throws IOException
   {
     return Double.longBitsToDouble(readLong());
   }
 
+  /**
+   * This method reads a Java float value from an input stream.  It
+   * operates by first reading an <code>int</code> value from the
+   * stream by calling the <code>readInt()</code> method in this
+   * interface, then converts that <code>int</code> to a
+   * <code>float</code> using the <code>intBitsToFloat</code> method
+   * in the class <code>java.lang.Float</code>
+   * <p>
+   * This method can read a <code>float</code> written by an object
+   * implementing the * <code>writeFloat()</code> method in the
+   * <code>DataOutput</code> interface.
+   *
+   * @return The <code>float</code> value read
+   *
+   * @exception EOFException If end of file is reached before reading the float
+   * @exception IOException If any other error occurs
+   *
+   * @see java.lang.Float
+   * @see DataOutput */
   public final float readFloat() throws IOException
   {
     return Float.intBitsToFloat(readInt());
   }
 
+  /**
+   * This method reads raw bytes into the passed array until the array is
+   * full.  Note that this method blocks until the data is available and
+   * throws an exception if there is not enough data left in the stream to
+   * fill the buffer
+   *
+   * @param b The buffer into which to read the data
+   *
+   * @exception EOFException If end of file is reached before filling
+   * the buffer
+   * @exception IOException If any other error occurs */
   public final void readFully(byte[] b) throws IOException
   {
     readFully(b, 0, b.length);
   }
 
+  /**
+   * This method reads raw bytes into the passed array
+   * <code>buf</code> starting <code>offset</code> bytes into the
+   * buffer.  The number of bytes read will be exactly
+   * <code>len</code> Note that this method blocks until the data is
+   * available and * throws an exception if there is not enough data
+   * left in the stream to read <code>len</code> bytes.
+   *
+   * @param buf The buffer into which to read the data
+   * @param offset The offset into the buffer to start storing data
+   * @param len The number of bytes to read into the buffer
+   *
+   * @exception EOFException If end of file is reached before filling
+   * the buffer
+   * @exception IOException If any other error occurs
+   */
   public final void readFully(byte[] b, int off, int len) throws IOException
   {
     if (off < 0 || len < 0 || off + len > b.length)
@@ -94,6 +261,33 @@
       }
   }
 
+  /**
+   * This method reads a Java <code>int</code> value from an input
+   * stream It operates by reading four bytes from the stream and
+   * converting them to a single Java <code>int</code> The bytes are
+   * stored most significant byte first (i.e., "big endian")
+   * regardless of the native host byte ordering.
+   * <p>
+   * As an example, if <code>byte1</code> through <code>byte4</code>
+   * represent the first four bytes read from the stream, they will be
+   * transformed to an <code>int</code> in the following manner:
+   * <p>
+   * <code>(int)(((byte1 & 0xFF) << 24) + ((byte2 & 0xFF) << 16) + 
+   * ((byte3 & 0xFF) << 8) + (byte4 & 0xFF)))</code>
+   * <p>
+   * The value returned is in the range of 0 to 65535.
+   * <p>
+   * This method can read an <code>int</code> written by an object
+   * implementing the <code>writeInt()</code> method in the
+   * <code>DataOutput</code> interface.
+   *
+   * @return The <code>int</code> value read
+   *
+   * @exception EOFException If end of file is reached before reading the int
+   * @exception IOException If any other error occurs
+   *
+   * @see DataOutput
+   */
   public final int readInt() throws IOException
   {
     int retval = 0;
@@ -103,7 +297,32 @@
     return retval;
   }
 
-  // Deprecated as of JDK 1.1
+  /**
+   * This method reads the next line of text data from an input
+   * stream.  It operates by reading bytes and converting those bytes
+   * to <code>char</code> values by treating the byte read as the low
+   * eight bits of the <code>char</code> and using 0 as the high eight
+   * bits.  Because of this, it does not support the full 16-bit
+   * Unicode character set.
+   * <p>
+   * The reading of bytes ends when either the end of file or a line
+   * terminator is encountered.  The bytes read are then returned as a
+   * <code>String</code> A line terminator is a byte sequence
+   * consisting of either <code>\r</code>, <code>\n</code> or
+   * <code>\r\n</code>.  These termination charaters are discarded and
+   * are not returned as part of the string.
+   * <p>
+   * This method can read data that was written by an object implementing the
+   * <code>writeLine()</code> method in <code>DataOutput</code>.
+   *
+   * @return The line read as a <code>String</code>
+   *
+   * @exception IOException If an error occurs
+   *
+   * @see DataOutput
+   *
+   * @deprecated
+   */
   public final String readLine() throws IOException
   {
     StringBuffer strb = new StringBuffer();
@@ -191,6 +410,35 @@
     return strb.length() > 0 ? strb.toString() : "";
   }
 
+  /**
+   * This method reads a Java long value from an input stream
+   * It operates by reading eight bytes from the stream and converting them to 
+   * a single Java <code>long</code>  The bytes are stored most
+   * significant byte first (i.e., "big endian") regardless of the native
+   * host byte ordering. 
+   * <p>
+   * As an example, if <code>byte1</code> through <code>byte8</code>
+   * represent the first eight bytes read from the stream, they will
+   * be transformed to an <code>long</code> in the following manner:
+   * <p>
+   * <code>(long)((((long)byte1 & 0xFF) << 56) + (((long)byte2 & 0xFF) << 48) + 
+   * (((long)byte3 & 0xFF) << 40) + (((long)byte4 & 0xFF) << 32) + 
+   * (((long)byte5 & 0xFF) << 24) + (((long)byte6 & 0xFF) << 16) + 
+   * (((long)byte7 & 0xFF) << 8) + ((long)byte9 & 0xFF)))</code>
+   * <p>
+   * The value returned is in the range of 0 to 65535.
+   * <p>
+   * This method can read an <code>long</code> written by an object
+   * implementing the <code>writeLong()</code> method in the
+   * <code>DataOutput</code> interface.
+   *
+   * @return The <code>long</code> value read
+   *
+   * @exception EOFException If end of file is reached before reading the long
+   * @exception IOException If any other error occurs
+   *
+   * @see DataOutput
+   */
   public final long readLong() throws IOException
   {
     long retval = 0L;
@@ -200,11 +448,54 @@
     return retval;
   }
 
+  /**
+   * This method reads a signed 16-bit value into a Java in from the
+   * stream.  It operates by reading two bytes from the stream and
+   * converting them to a single 16-bit Java <code>short</code>.  The
+   * two bytes are stored most significant byte first (i.e., "big
+   * endian") regardless of the native host byte ordering.
+   * <p>
+   * As an example, if <code>byte1</code> and <code>byte2</code>
+   * represent the first and second byte read from the stream
+   * respectively, they will be transformed to a <code>short</code>. in
+   * the following manner:
+   * <p>
+   * <code>(short)(((byte1 & 0xFF) << 8) | (byte2 & 0xFF)</code>
+   * <p>
+   * The value returned is in the range of -32768 to 32767.
+   * <p>
+   * This method can read a <code>short</code> written by an object
+   * implementing the <code>writeShort()</code> method in the
+   * <code>DataOutput</code> interface.
+   *
+   * @return The <code>short</code> value read
+   *
+   * @exception EOFException If end of file is reached before reading the value
+   * @exception IOException If any other error occurs
+   *
+   * @see DataOutput
+   */
   public final short readShort() throws IOException
   {
     return (short) ((readByte() << 8) | readUnsignedByte());
   }
 
+  /**
+   * This method reads 8 unsigned bits into a Java <code>int</code>
+   * value from the stream. The value returned is in the range of 0 to
+   * 255.
+   * <p>
+   * This method can read an unsigned byte written by an object
+   * implementing the <code>writeUnsignedByte()</code> method in the
+   * <code>DataOutput</code> interface.
+   *
+   * @return The unsigned bytes value read as a Java <code>int</code>.
+   *
+   * @exception EOFException If end of file is reached before reading the value
+   * @exception IOException If any other error occurs
+   *
+   * @see DataOutput
+   */
   public final int readUnsignedByte() throws IOException
   {
     int i = read();
@@ -214,16 +505,121 @@
     return (i & 0xFF);
   }
 
+  /**
+   * This method reads 16 unsigned bits into a Java int value from the stream.
+   * It operates by reading two bytes from the stream and converting them to 
+   * a single Java <code>int</code>  The two bytes are stored most
+   * significant byte first (i.e., "big endian") regardless of the native
+   * host byte ordering. 
+   * <p>
+   * As an example, if <code>byte1</code> and code{byte2</code>
+   * represent the first and second byte read from the stream
+   * respectively, they will be transformed to an <code>int</code> in
+   * the following manner:
+   * <p>
+   * <code>(int)(((byte1 & 0xFF) << 8) + (byte2 & 0xFF))</code>
+   * <p>
+   * The value returned is in the range of 0 to 65535.
+   * <p>
+   * This method can read an unsigned short written by an object
+   * implementing the <code>writeUnsignedShort()</code> method in the
+   * <code>DataOutput</code> interface.
+   *
+   * @return The unsigned short value read as a Java <code>int</code>
+   *
+   * @exception EOFException If end of file is reached before reading the value
+   * @exception IOException If any other error occurs
+   */
   public final int readUnsignedShort() throws IOException
   {
     return (readUnsignedByte() << 8) | readUnsignedByte();
   }
 
+  /**
+   * This method reads a <code>String</code> from an input stream that
+   * is encoded in a modified UTF-8 format.  This format has a leading
+   * two byte sequence that contains the remaining number of bytes to
+   * read.  This two byte sequence is read using the
+   * <code>readUnsignedShort()</code> method of this interface.
+   * <p>
+   * After the number of remaining bytes have been determined, these
+   * bytes are read an transformed into <code>char</code> values.
+   * These <code>char</code> values are encoded in the stream using
+   * either a one, two, or three byte format.  The particular format
+   * in use can be determined by examining the first byte read.
+   * <p>
+   * If the first byte has a high order bit of 0, then that character
+   * consists on only one byte.  This character value consists of
+   * seven bits that are at positions 0 through 6 of the byte.  As an
+   * example, if <code>byte1</code> is the byte read from the stream,
+   * it would be converted to a <code>char</code> like so:
+   * <p>
+   * <code>(char)byte1</code>
+   * <p>
+   * If the first byte has 110 as its high order bits, then the 
+   * character consists of two bytes.  The bits that make up the character
+   * value are in positions 0 through 4 of the first byte and bit positions
+   * 0 through 5 of the second byte.  (The second byte should have 
+   * 10 as its high order bits).  These values are in most significant
+   * byte first (i.e., "big endian") order.
+   * <p>
+   * As an example, if <code>byte1</code> and <code>byte2</code> are
+   * the first two bytes read respectively, and the high order bits of
+   * them match the patterns which indicate a two byte character
+   * encoding, then they would be converted to a Java
+   * <code>char</code> like so:
+   * <p>
+   * <code>(char)(((byte1 & 0x1F) << 6) | (byte2 & 0x3F))</code>
+   * <p>
+   * If the first byte has a 1110 as its high order bits, then the
+   * character consists of three bytes.  The bits that make up the character
+   * value are in positions 0 through 3 of the first byte and bit positions
+   * 0 through 5 of the other two bytes.  (The second and third bytes should
+   * have 10 as their high order bits).  These values are in most
+   * significant byte first (i.e., "big endian") order.
+   * <p>
+   * As an example, if <code>byte1</code> <code>byte2</code> and
+   * <code>byte3</code> are the three bytes read, and the high order
+   * bits of them match the patterns which indicate a three byte
+   * character encoding, then they would be converted to a Java
+   * <code>char</code> like so:
+   * <p>
+   * <code>(char)(((byte1 & 0x0F) << 12) | ((byte2 & 0x3F) << 6) | (byte3 & 0x3F))</code>
+   * <p>
+   * Note that all characters are encoded in the method that requires
+   * the fewest number of bytes with the exception of the character
+   * with the value of <code>\u0000</code> which is encoded as two
+   * bytes.  This is a modification of the UTF standard used to
+   * prevent C language style <code>NUL</code> values from appearing
+   * in the byte stream.
+   * <p>
+   * This method can read data that was written by an object implementing the
+   * <code>writeUTF()</code> method in <code>DataOutput</code>
+   * 
+   * @returns The <code>String</code> read
+   *
+   * @exception EOFException If end of file is reached before reading
+   * the String
+   * @exception UTFDataFormatException If the data is not in UTF-8 format
+   * @exception IOException If any other error occurs
+   *
+   * @see DataOutput
+   */
   public final String readUTF() throws IOException
   {
     return readUTF(this);
   }
 
+  /**
+   * This method reads a String encoded in UTF-8 format from the 
+   * specified <code>DataInput</code> source.
+   *
+   * @param in The <code>DataInput</code> source to read from
+   *
+   * @return The String read from the source
+   *
+   * @exception IOException If an error occurs
+   */
   public final static String readUTF(DataInput in) throws IOException
   {
     final int UTFlen = in.readUnsignedShort();
@@ -265,6 +661,18 @@
     return strbuf.toString();
   }
 
+  /**
+   * This method attempts to skip and discard the specified number of bytes 
+   * in the input stream.  It may actually skip fewer bytes than requested. 
+   * The actual number of bytes skipped is returned.  This method will not
+   * skip any bytes if passed a negative number of bytes to skip.
+   *
+   * @param n The requested number of bytes to skip.
+   *
+   * @return The number of bytes actually skipped.
+   *
+   * @exception IOException If an error occurs.
+   */
   public final int skipBytes(int n) throws IOException
   {
     // The contract in the Java Lang. Spec. says that this never
Index: java/lang/natSystem.cc
===================================================================
RCS file: /cvs/java/libgcj/libjava/java/lang/natSystem.cc,v
retrieving revision 1.26
diff -u -r1.26 natSystem.cc
--- natSystem.cc	2000/09/05 11:05:58	1.26
+++ natSystem.cc	2000/09/11 00:08:23
@@ -24,6 +24,10 @@
 #include <sys/utsname.h>
 #endif
 
+#ifdef HAVE_LANGINFO_H
+#include <langinfo.h>
+#endif
+
 #include <gcj/cni.h>
 #include <jvm.h>
 #include <java-props.h>
@@ -151,9 +155,26 @@
   return _Jv_HashCode (obj);
 }
 
+#if ! defined (DEFAULT_FILE_ENCODING) && defined (HAVE_ICONV) \
+    && defined (HAVE_NL_LANGINFO)
+
+static char *
+file_encoding ()
+{
+  setlocale (LC_CTYPE, "");
+  char *e = nl_langinfo (CODESET);
+  if (e == NULL || *e == '\0')
+    e = "8859_1";
+}
+
+#define DEFAULT_FILE_ENCODING file_encoding ()
+
+#endif
+
 #ifndef DEFAULT_FILE_ENCODING
 #define DEFAULT_FILE_ENCODING "8859_1"
 #endif
+
 static char *default_file_encoding = DEFAULT_FILE_ENCODING;
 
 #if HAVE_GETPWUID_R


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