From 2a793f18526a05291129d30cab5a446d4d4c0946 Mon Sep 17 00:00:00 2001 From: ljrittle Date: Tue, 12 Jun 2001 23:09:09 +0000 Subject: 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. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@43278 138bc75d-0d04-0410-961f-82ee72b054a4 --- libstdc++-v3/config/os/bsd/freebsd/bits/os_defines.h | 1 + 1 file changed, 1 insertion(+) (limited to 'libstdc++-v3/config/os/bsd') diff --git a/libstdc++-v3/config/os/bsd/freebsd/bits/os_defines.h b/libstdc++-v3/config/os/bsd/freebsd/bits/os_defines.h index 1cb71d149ec..3a6803f8f3d 100644 --- a/libstdc++-v3/config/os/bsd/freebsd/bits/os_defines.h +++ b/libstdc++-v3/config/os/bsd/freebsd/bits/os_defines.h @@ -35,6 +35,7 @@ /* System-specific #define, typedefs, corrections, etc, go here. This file will come before all others. */ +#define _GLIBCPP_AVOID_FSEEK 1 #endif -- cgit v1.2.3