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
generic/bits
gnu-linux/bits	c++config (__NO_MATH_INLINES): Move to...	2001-05-24 20:51:33 +00:00
hpux/bits
irix
newlib/bits
solaris	porting.texi: Add documentation about libstdc++-v3-specific macros that are currently...	2001-06-12 23:09:09 +00:00