The current code is not able to unset an environment variable, only to set it to an empty value. This patch refactors a bit the Message class and uses a new EnvChanger helper class that allows to change temporarily an environment variable and that is able to unset variables if needed.
The patch also adds new functions hasEnv and unsetEnv in environment.cpp.
Open issues:
* there may be systems where unsetenv is not available and putenv("name=") does not do the right thing;
* unsetenv may lead to leaks on some platforms.
* when using unsetenv, we may need to remove strings from the internal map that setEnv uses.
Remove all explicit 8bit characters from the source, to fix compilation
with windows xp under a chinese locale (bug 3496).
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@18256 a592a061-630c-0410-9148-cb99ea01b6c8
* src/LaTeX.C
(LaTeX::deplog): Assume that filenames in log files are stored in
the file system encoding
* src/frontends/qt4/qt_helpers.[Ch]
(internal_path): delete
* src/frontends/qt4/QGraphics.C: Adjust to change above
* src/frontends/qt4/QPrefsDialog.C: ditto
* src/frontends/qt4/QExternal.C: ditto
* src/frontends/qt4/QInclude.C: ditto
* src/support/os.h: Document the encoding of filename arguments
* src/support/os_win32.h: ditto
* src/support/filetools.C
(findtexfile): Convert filename from file system encoding
* src/support/os_win32.C: Convert filenames from utf8 to file system
encoding and vice versa where needed
* src/support/os_cygwin.C: ditto
* src/support/getcwd.C
(getcwd): Use internal_path() with correct encoding
* src/support/docstring.[Ch]
(from_filesystem8bit): new conversion function
* src/support/environment.C
(getEnv): convert environment variable from local 8bit encoding to utf8
(setEnv): convert environment variable from utf8 to local 8bit encoding
* src/support/environment.h: document encoding of function arguments
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@16753 a592a061-630c-0410-9148-cb99ea01b6c8
