env.c

/*
 * See Licensing and Copyright notice in naev.h
 */
#include <assert.h>
#include <limits.h>
#include <stdlib.h>
#include "env.h"
 
#include "log.h"
#include "nstring.h"
 
env_t env;
 
void env_detect( int argc, char **argv )
{
   (void) argc;
   static short once = 0;
   assert( once == 0 );
   once = 1;
 
   env.appimage = getenv( "APPIMAGE" );
   if (env.appimage != NULL) {
      env.isAppImage = 1;
      env.argv0      = getenv( "ARGV0" );
      env.appdir     = getenv( "APPDIR" );
   }
   else {
      env.isAppImage = 0;
      env.argv0      = argv[0];
   }
}
 
int nsetenv( const char *name, const char *value, int overwrite )
{
#if HAVE_DECL_SETENV
   return setenv( name, value, overwrite );
#else /* HAVE_DECL_SETENV */
   if (!overwrite) {
#if HAVE_DECL_GETENV_S
      size_t envsize = 0;
      int errcode = getenv_s( &envsize, NULL, 0, name );
      if (errcode || envsize)
         return errcode;
#else /* HAVE_DECL__PUTENV_S */
      const char *envval = getenv( name );
      if (envval != NULL)
         return 0;
#endif /* HAVE_DECL__PUTENV_S */
   }
#if HAVE_DECL__PUTENV_S
   return _putenv_s(name, value);
#else /* HAVE_DECL__PUTENV_S */
   char *buf;
   asprintf( &buf, "%s=%s", name, value );
   /* Per the standard, the string pointed to by putenv's argument becomes part of the environment
    * ("so altering the string alters the environment" and "it is an error to call putenv() with an
    * automatic variable as the argument".)
    * If we're stuck using this wildly dangerous function, just leak the memory.
    * */
   return putenv( buf );
#endif /* HAVE_DECL__PUTENV_S */
#endif /* HAVE_DECL_SETENV */
}