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Loren J. Rittle ddf1e65262 porting.texi: Add documentation about libstdc++-v3-specific macros that are currently... 
libstdc++/2071
	* porting.texi: Add documentation about libstdc++-v3-specific
	macros that are currently included in os_defines.h files.

	* config/basic_file_stdio.h (sys_getc): New method.
	(sys_ungetc): New method.
	* include/bits/basic_file.h: (sys_getc): New method signature.
	(sys_ungetc): New method signature.

	* include/bits/fstream.tcc (underflow): Add conditional code
	paths which avoid using short seeks on streams (especially
	useful when the stream might be interactive or a pipe).  At
	the moment, this alternate path only avoids seeking when the
	``buffer size'' of underflow() is 1 since the C standard only
	guarantees buffer space for one ungetc (this technique could
	be extended since *-*-solaris* supports buffering for 4 calls
	to ungetc and *-*-*bsd* supports buffering limited only by
	memory resources).  Also, _GLIBCPP_AVOID_FSEEK must be defined
	in a port's os_defines.h file for this alternate path to even
	be considered.  As a bonus, the idiom of using getc/ungetc
	requires no system calls whereas fseek maps to one or two
	system call(s) on many platforms.

	* config/os/bsd/freebsd/bits/os_defines.h (_GLIBCPP_AVOID_FSEEK):
	Define it.
	* config/os/solaris/solaris2.5/bits/os_defines.h
	(_GLIBCPP_AVOID_FSEEK): Likewise.
	* config/os/solaris/solaris2.6/bits/os_defines.h
	(_GLIBCPP_AVOID_FSEEK): Likewise.
	* config/os/solaris/solaris2.7/bits/os_defines.h
	(_GLIBCPP_AVOID_FSEEK): Likewise.

From-SVN: r43278
 		2001-06-12 23:09:09 +00:00
..
aix/bits gen-num-limits.cc: Instantiate for wchar_t. 2001-03-20 11:39:45 -08:00
bsd porting.texi: Add documentation about libstdc++-v3-specific macros that are currently... 2001-06-12 23:09:09 +00:00
djgpp/bits ctype_noninline.h: Fix typo and remove duplicate definitions of __dj_ctype_* 2001-03-13 20:10:01 +00:00
generic/bits ctype_inline.h (is): Same. 2000-12-19 19:49:00 +00:00
gnu-linux/bits c++config (__NO_MATH_INLINES): Move to... 2001-05-24 20:51:33 +00:00
hpux/bits ctype_base.h: Make ctype masks match HP-UX ctype.h header file. 2001-03-13 21:32:44 -07:00
irix Add Irix 5.2, 6.3 support. 2001-03-07 18:35:46 +00:00
newlib/bits ctype_inline.h (is): Same. 2000-12-19 19:49:00 +00:00
solaris porting.texi: Add documentation about libstdc++-v3-specific macros that are currently... 2001-06-12 23:09:09 +00:00