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Add comments about putenv() usage

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Again thanks to Enrico.
This commit is contained in:
Georg Baum 2014-03-10 20:59:03 +01:00
parent e3714947b0
commit 362630fba1
1 changed files with 6 additions and 0 deletions
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6
src/support/environment.cpp
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@ -71,6 +71,10 @@ bool setEnv(string const & name, string const & value)
#if defined (HAVE_SETENV)
return ::setenv(name.c_str(), encoded.c_str(), 1) == 0;
#elif defined (HAVE_PUTENV)
// According to http://pubs.opengroup.org/onlinepubs/9699919799/functions/putenv.html
// the argument of putenv() needs to be static, because changing its
// value will change the environment. Therefore we need a different static
// storage for each variable.
static map<string, string> varmap;
varmap[name] = name + '=' + encoded;
return ::putenv(const_cast<char*>(varmap[name].c_str())) == 0;
@ -132,6 +136,8 @@ bool unsetEnv(string const & name)
return ::unsetenv(name.c_str()) == 0;
#elif defined(HAVE_PUTENV)
// This is OK with MSVC and MinGW at least.
// FIXME: According to http://pubs.opengroup.org/onlinepubs/9699919799/functions/putenv.html
// the argument of putenv() needs to be static, see setEnv().
return ::putenv(const_cast<char*>((name + "=").c_str())) == 0;
#else
#error No environment-unsetting function has been defined.