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* gdbint.texinfo (Clean Design and Portable Implementation): 

Renamed from "Clean Design".
	(Clean Design and Portable Implementation): Document portable
	methods of handling file names, and the associated macros.
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Eli Zaretskii 2001-05-10 10:29:37 +00:00
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@ -1,3 +1,10 @@
2001-05-10 Eli Zaretskii <eliz@is.elta.co.il>
* gdbint.texinfo (Clean Design and Portable Implementation):
Renamed from "Clean Design".
(Clean Design and Portable Implementation): Document portable
methods of handling file names, and the associated macros.
2001-04-02 Eli Zaretskii <eliz@is.elta.co.il>
* gdb.texinfo (Tracepoint Actions): Mention the "info scope"

63
gdb/doc/gdbint.texinfo
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@ -4133,7 +4133,7 @@ visible to random source files.
All static functions must be declared in a block near the top of the
source file.
@subsection Clean Design
@subsection Clean Design and Portable Implementation
@cindex design
In addition to getting the syntax right, there's the little question of
@ -4219,6 +4219,67 @@ with @code{GET_SAVED_REGISTER}, since that would result in much
duplicated code. Other times, duplicating a few lines of code here or
there is much cleaner than introducing a large number of small hooks.
@cindex portable file name handling
@cindex file names, portability
One particularly notorious area where system dependencies tend to
creep in is handling of file names. The mainline @value{GDBN} code
assumes Posix semantics of file names: absolute file names begin with
a forward slash @file{/}, slashes are used to separate leading
directories, case-sensitive file names. These assumptions are not
necessarily true on non-Posix systems such as MS-Windows. To avoid
system-dependent code where you need to take apart or construct a file
name, use the following portable macros:
@table @code
@findex HAVE_DOS_BASED_FILE_SYSTEM
@item HAVE_DOS_BASED_FILE_SYSTEM
This preprocessing symbol is defined to a non-zero value on hosts
whose filesystems belong to the MS-DOS/MS-Windows family. Use this
symbol to write conditional code which should only be compiled for
such hosts.
@findex IS_DIR_SEPARATOR
@item IS_DIR_SEPARATOR (@var{c}
Evaluates to a non-zero value if @var{c} is a directory separator
character. On Unix and GNU/Linux systems, only a slash @file{/} is
such a character, but on Windows, both @file{/} and @file{\} will
pass.
@findex IS_ABSOLUTE_PATH
@item IS_ABSOLUTE_PATH (@var{file})
Evaluates to a non-zero value if @var{file} is an absolute file name.
For Unix and GNU/Linux hosts, a name which begins with a slash
@file{/} is absolute. On DOS and Windows, @file{d:/foo} and
@file{x:\bar} are also absolute file names.
@findex FILENAME_CMP
@item FILENAME_CMP (@var{f1}, @var{f2})
Calls a function which compares file names @var{f1} and @var{f2} as
appropriate for the underlying host filesystem. For Posix systems,
this simply calls @code{strcmp}; on case-insensitive filesystems it
will call @code{strcasecmp} instead.
@findex DIRNAME_SEPARATOR
@item DIRNAME_SEPARATOR
Evaluates to a character which separates directories in
@code{PATH}-style lists, typically held in environment variables.
This character is @samp{:} on Unix, @samp{;} on DOS and Windows.
@findex SLASH_STRING
@item SLASH_STRING
This evaluates to a constant string you should use to produce an
absolute filename from leading directories and the file's basename.
@code{SLASH_STRING} is @code{"/"} on most systems, but might be
@code{"\\"} for some Windows-based ports.
@end table
In addition to using these macros, be sure to use portable library
functions whenever possible. For example, to extract a directory or a
basename part from a file name, use the @code{dirname} and
@code{basename} library functions (available in @code{libiberty} for
platforms which don't provide them), instead of searching for a slash
with @code{strrchr}.
Another way to generalize @value{GDBN} along a particular interface is with an
attribute struct. For example, @value{GDBN} has been generalized to handle
multiple kinds of remote interfaces---not by @code{#ifdef}s everywhere, but