[PATCH] Introduce llvm::sys::path::home_directory.

[Peter Collingbourne]

================
Comment at: lib/Support/Unix/Path.inc:805
@@ +804,3 @@
+
+  return false;
+}
----------------
David Majnemer wrote:
> Have you considered falling back to `getpwuid_r` on SUSv3? Something like:
>   bufsize = 2048;
> 
>   #ifdef _SC_GETPW_R_SIZE_MAX
>   if ((getpw_r_size_max = sysconf(_SC_GETPW_R_SIZE_MAX)) > 0)
>     bufsize = (size_t)getpw_r_size_max;
>   #endif
> 
>   uid = getuid();
> 
>   buf = NULL;
>   do {
>     if ((tbuf = realloc(buf, bufsize)) == NULL) {
>       free(buf);
>       return false;
>     }
>     buf = tbuf;
>     err = getpwuid_r(uid, &pw, buf, bufsize, &tpw);
>     bufsize *= 2;
>   } while (err == ERANGE);
> 
>   if (err) {
>     free(buf);
>     return false;
>   }
> 
>   if (!tpw || !pw.pw_dir)
>     return false;
> 
>   result.append(pw.pw_dir, pw.pw_dir + strlen(pw.pw_dir));
>   return true;
My understanding (from reading the getpwuid_r man page) is that user programs should be checking $HOME.  If $HOME is not set, the user probably doesn't want the program using any directory as their home directory.


http://llvm-reviews.chandlerc.com/D2199