LI72864: \X TRUNCATION OF UNICODE CHARACTERS USING -QUTF WITH XL C++ V8.0

Latest updates for XL C/C++ Advanced Edition V8 for Linux
May 2009 Updates for XL C/C++ Advanced Edition V8 for Linux

APAR status

• Closed as program error.

Error description

• XL C++ V7 and V8 using the -qutf option outputs a warning
  message when using the \x escape sequence combined with the UTF
  literal syntax (u'character').  The warning appears when the
  escape sequence is larger than 255.
  
  
  ===== TEST CASE =====
  
  #include<stdio.h>
  
  main() {
  printf("\nu\"a\"[0] == 0x%04x\n", (unsigned int)u"a"[0]);
  printf("u\"\\x61\"[0] == 0x%04x\n", (unsigned int)u"\x61"[0]);
  printf("u\"\\x0061\"[0] == 0x%04x\n", (unsigned
  int)u"\x0061"[0]);
  printf("u\"\\x6100\"[0] == 0x%04x\n", (unsigned
  int)u"\x6100"[0]);
  
  printf("u\'a\' == 0x%04x\n", (unsigned int)u'a');
  printf("u\'\\x61\' == 0x%04x\n", (unsigned int)u'\x61');
  printf("u\'\\x0061\' == 0x%04x\n", (unsigned int)u'\x0061');
  printf("u\'\\x6100\' == 0x%04x\n\n", (unsigned int)u'\x6100');
  }
  
  
  ===== COMPILE =====
  xlC -qutf test.cpp
  

Local fix

• Use the universal character name escape sequence with form:
  \u#### (# = hex digit) instead of the hex escape sequence.
  

Problem summary

• \x inside a u or U literal.
  
  Previously \x is processed like \u or \U depending on the
  containing literal.  For consistency with L literals (see 2.13.2
  paragraph 4) any number of digits should be accepted for a \x
  character sequence.
  

Problem conclusion

• Processing of \x in utf-16 and utf-32 literals has
  been changed to be consistent with \x in wchar_t
  literals.  Binary compatibility is not a problem here,
  any \x value greater than 0xFF was previously
  generating warning: 1540-0812 (W) The escape
  sequence "\x100" is out of range. Value is
  truncated.  For value [0, 0xFF] the character value remains
  unchanged.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  IY99131

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  XLC/C++ RHEL4

• Fixed component ID

  5724M1610

Applicable component levels

• R800 PSN IY99131

     UP06/09/13