Bug #3399: UNC path is not handled properly
http://redmine.ruby-lang.org/issues/show/3399

Author: jojelino lastname
Status: Open, Priority: Low
Category: core
ruby -v: latest trunk

(gdb)
0x62d4a4f1      2835        BUFINIT();
(gdb) print s
$5 = 0xc7dfa0 "//?/D:/ruby2/lib/ruby/site_ruby/1.9.1"
this is from rbconfig.rb
  CONFIG = {}
  CONFIG["DESTDIR"] = DESTDIR
  CONFIG["MAJOR"] = "1"
  CONFIG["MINOR"] = "9"
  CONFIG["TEENY"] = "1"
  CONFIG["PATCHLEVEL"] = "-1"
  CONFIG["INSTALL"] = '/usr/bin/ginstall -c'
  CONFIG["EXEEXT"] = ".exe"
  CONFIG["prefix"] = (TOPDIR || DESTDIR + "d:/ruby2")
  CONFIG["ruby_install_name"] = "ruby"
  CONFIG["RUBY_INSTALL_NAME"] = "ruby"
  CONFIG["RUBY_SO_NAME"] = "msvcrt-ruby191"
  CONFIG["PACKAGE"] = "ruby"
  CONFIG["BUILTIN_TRANSSRCS"] = " newline.c"
  CONFIG["MANTYPE"] = "doc"
  CONFIG["NROFF"] = "/usr/bin/nroff"
  CONFIG["vendorhdrdir"] = "$(rubyhdrdir)/vendor_ruby"
  CONFIG["sitehdrdir"] = "$(rubyhdrdir)/site_ruby"
  CONFIG["rubyhdrdir"] = "$(includedir)/$(RUBY_BASE_NAME)-$(ruby_version)"
  CONFIG["UNIVERSAL_INTS"] = ""
  CONFIG["UNIVERSAL_ARCHNAMES"] = ""
  CONFIG["configure_args"] = " 'optflags=-mno-cygwin -O4' '--enable-load-relative' '--target=i686-pc-mingw32' '--prefix=/usr/mingw' '--disable-install-doc' 'target_alias=i686-pc-mingw32'"
  CONFIG["vendordir"] = "$(rubylibprefix)/vendor_ruby"
  CONFIG["sitedir"] = "$(rubylibprefix)/site_ruby"
  CONFIG["ruby_version"] = "1.9.1"
  CONFIG["sitearch"] = "i386-msvcrt"
  CONFIG["arch"] = "i386-mingw32"
  CONFIG["RI_BASE_NAME"] = "ri"
  CONFIG["ridir"] = "$(datarootdir)/$(RI_BASE_NAME)"
  CONFIG["rubylibprefix"] = "$(libdir)/$(RUBY_BASE_NAME)"
  CONFIG["MAKEFILES"] = "Makefile GNUmakefile"
  CONFIG["THREAD_MODEL"] = "win32"
  CONFIG["EXPORT_PREFIX"] = " "
  CONFIG["COMMON_HEADERS"] = "winsock2.h windows.h"
  CONFIG["COMMON_MACROS"] = ""
  CONFIG["COMMON_LIBS"] = "m"
  CONFIG["MAINLIBS"] = ""
  CONFIG["ENABLE_SHARED"] = "yes"
  CONFIG["DLDLIBS"] = ""
  CONFIG["SOLIBS"] = "$(LIBS)"
  CONFIG["LIBRUBYARG_SHARED"] = "-l$(RUBY_SO_NAME)"
  CONFIG["LIBRUBYARG_STATIC"] = "-l$(RUBY_SO_NAME)-static"
  CONFIG["LIBRUBYARG"] = "$(LIBRUBYARG_SHARED)"
  CONFIG["LIBRUBY"] = "lib$(RUBY_SO_NAME).dll.a"
  CONFIG["LIBRUBY_ALIASES"] = ""
  CONFIG["LIBRUBY_SO"] = "$(RUBY_SO_NAME).dll"
  CONFIG["LIBRUBY_A"] = "lib$(RUBY_SO_NAME)-static.a"
  CONFIG["RUBYW_INSTALL_NAME"] = "$(RUBYW_BASE_NAME)"
  CONFIG["rubyw_install_name"] = "$(RUBYW_INSTALL_NAME)"
  CONFIG["LIBRUBY_DLDFLAGS"] = " -mno-cygwin -Wl,--enable-auto-image-base,--enable-auto-import -Wl,--out-implib=$(LIBRUBY) $(RUBYDEF)"
  CONFIG["LIBRUBY_LDSHARED"] = "$(CC) -mno-cygwin -shared $(if $(filter-out -g -g0,$(debugflags)),,-g3)"
  CONFIG["warnflags"] = "-Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long"
  CONFIG["debugflags"] = "-g"
  CONFIG["optflags"] = "-mno-cygwin -O4"
  CONFIG["cxxflags"] = " $(optflags) $(debugflags) $(warnflags)"
  CONFIG["cflags"] = " $(optflags) $(debugflags) $(warnflags)"
  CONFIG["cppflags"] = ""
  CONFIG["INSTALLDOC"] = "nodoc"
  CONFIG["RDOCTARGET"] = "nodoc"
  CONFIG["EXECUTABLE_EXTS"] = ".exe .com .cmd .bat"
  CONFIG["ARCHFILE"] = ""
  CONFIG["EXTOUT"] = ".ext"
  CONFIG["PREP"] = "miniruby$(EXEEXT)"
  CONFIG["TEST_RUNNABLE"] = "yes"
  CONFIG["setup"] = "Setup"
  CONFIG["EXTSTATIC"] = ""
  CONFIG["STRIP"] = "strip"
  CONFIG["TRY_LINK"] = ""
  CONFIG["LIBPATHENV"] = ""
  CONFIG["RPATHFLAG"] = ""
  CONFIG["LIBPATHFLAG"] = " -L%s"
  CONFIG["LINK_SO"] = ""
  CONFIG["LIBEXT"] = "a"
  CONFIG["DLEXT2"] = ""
  CONFIG["DLEXT"] = "so"
  CONFIG["LDSHAREDXX"] = "$(CXX) -mno-cygwin -shared $(if $(filter-out -g -g0,$(debugflags)),,-g3)"
  CONFIG["LDSHARED"] = "$(CC) -mno-cygwin -shared $(if $(filter-out -g -g0,$(debugflags)),,-g3)"
  CONFIG["CCDLFLAGS"] = " -mno-cygwin "
  CONFIG["STATIC"] = ""
  CONFIG["ARCH_FLAG"] = ""
  CONFIG["DLDFLAGS"] = " -mno-cygwin  -Wl,--enable-auto-image-base,--enable-auto-import $(DEFFILE)"
  CONFIG["ALLOCA"] = ""
  CONFIG["CHDIR"] = "cd -P"
  CONFIG["RMALL"] = "rm -fr"
  CONFIG["RMDIRS"] = "rmdir -p"
  CONFIG["CP"] = "cp"
  CONFIG["RM"] = "rm -f"
  CONFIG["CAPITARGET"] = "nodoc"
  CONFIG["DOXYGEN"] = "doxygen"
  CONFIG["DOT"] = ""
  CONFIG["MAKEDIRS"] = "/usr/bin/mkdir -p"
  CONFIG["MKDIR_P"] = "/usr/bin/mkdir -p"
  CONFIG["INSTALL_DATA"] = "$(INSTALL) -m 644"
  CONFIG["INSTALL_SCRIPT"] = "$(INSTALL)"
  CONFIG["INSTALL_PROGRAM"] = "$(INSTALL)"
  CONFIG["SET_MAKE"] = ""
  CONFIG["LN_S"] = "ln -s"
  CONFIG["DLLWRAP"] = "dllwrap"
  CONFIG["WINDRES"] = "windres"
  CONFIG["NM"] = "nm"
  CONFIG["OBJCOPY"] = ":"
  CONFIG["OBJDUMP"] = "objdump"
  CONFIG["ASFLAGS"] = ""
  CONFIG["AS"] = "as"
  CONFIG["AR"] = "ar"
  CONFIG["RANLIB"] = "ranlib"
  CONFIG["try_header"] = ""
  CONFIG["COUTFLAG"] = "-o "
  CONFIG["OUTFLAG"] = "-o "
  CONFIG["CPPOUTFILE"] = "-o conftest.i"
  CONFIG["GNU_LD"] = "yes"
  CONFIG["GCC"] = "yes"
  CONFIG["EGREP"] = "/usr/bin/grep -E"
  CONFIG["GREP"] = "/usr/bin/grep"
  CONFIG["CPP"] = "$(CC) -E"
  CONFIG["CXXFLAGS"] = "$(cxxflags)"
  CONFIG["CXX"] = "g++"
  CONFIG["OBJEXT"] = "o"
  CONFIG["CPPFLAGS"] = " $(DEFS) $(cppflags)"
  CONFIG["LDFLAGS"] = "-L. -mno-cygwin "
  CONFIG["CFLAGS"] = "$(cflags)"
  CONFIG["CC"] = "gcc"
  CONFIG["target_os"] = "mingw32"
  CONFIG["target_vendor"] = "pc"
  CONFIG["target_cpu"] = "i386"
  CONFIG["target"] = "i386-pc-mingw32"
  CONFIG["host_os"] = "cygwin"
  CONFIG["host_vendor"] = "pc"
  CONFIG["host_cpu"] = "i686"
  CONFIG["host"] = "i686-pc-cygwin"
  CONFIG["build_os"] = "cygwin"
  CONFIG["build_vendor"] = "pc"
  CONFIG["build_cpu"] = "i686"
  CONFIG["build"] = "i686-pc-cygwin"
  CONFIG["RUBYW_BASE_NAME"] = "rubyw"
  CONFIG["RUBY_BASE_NAME"] = "ruby"
  CONFIG["RUBY_RELEASE_DATE"] = "2010-06-05"
  CONFIG["RUBY_PROGRAM_VERSION"] = "1.9.3"
  CONFIG["BASERUBY"] = "ruby"
  CONFIG["target_alias"] = "i386-pc-mingw32"
  CONFIG["host_alias"] = ""
  CONFIG["build_alias"] = ""
  CONFIG["LIBS"] = " -mno-cygwin -lshell32 -lws2_32 -limagehlp "
  CONFIG["ECHO_T"] = ""
  CONFIG["ECHO_N"] = "-n"
  CONFIG["ECHO_C"] = ""
  CONFIG["DEFS"] = ""
  CONFIG["mandir"] = "$(datarootdir)/man"
  CONFIG["localedir"] = "$(datarootdir)/locale"
  CONFIG["libdir"] = "$(exec_prefix)/lib"
  CONFIG["psdir"] = "$(docdir)"
  CONFIG["pdfdir"] = "$(docdir)"
  CONFIG["dvidir"] = "$(docdir)"
  CONFIG["htmldir"] = "$(docdir)"
  CONFIG["infodir"] = "$(datarootdir)/info"
  CONFIG["docdir"] = "$(datarootdir)/doc/$(PACKAGE)"
  CONFIG["oldincludedir"] = "/usr/include"
  CONFIG["includedir"] = "$(prefix)/include"
  CONFIG["localstatedir"] = "$(prefix)/var"
  CONFIG["sharedstatedir"] = "$(prefix)/com"
  CONFIG["sysconfdir"] = "$(prefix)/etc"
  CONFIG["datadir"] = "$(datarootdir)"
  CONFIG["datarootdir"] = "$(prefix)/share"
  CONFIG["libexecdir"] = "$(exec_prefix)/libexec"
  CONFIG["sbindir"] = "$(exec_prefix)/sbin"
  CONFIG["bindir"] = "$(exec_prefix)/bin"
  CONFIG["exec_prefix"] = "$(prefix)"
  CONFIG["PACKAGE_URL"] = ""
  CONFIG["PACKAGE_BUGREPORT"] = ""
  CONFIG["PACKAGE_STRING"] = ""
  CONFIG["PACKAGE_VERSION"] = ""
  CONFIG["PACKAGE_TARNAME"] = ""
  CONFIG["PACKAGE_NAME"] = ""
  CONFIG["PATH_SEPARATOR"] = ":"
  CONFIG["SHELL"] = "/bin/sh"
  CONFIG["rubylibdir"] = "$(rubylibprefix)/$(ruby_version)"
  CONFIG["archdir"] = "$(rubylibdir)/$(arch)"
  CONFIG["sitelibdir"] = "$(sitedir)/$(ruby_version)"
  CONFIG["sitearchdir"] = "$(sitelibdir)/$(sitearch)"
  CONFIG["vendorlibdir"] = "$(vendordir)/$(ruby_version)"
  CONFIG["vendorarchdir"] = "$(vendorlibdir)/$(sitearch)"
  CONFIG["topdir"] = File.dirname(__FILE__)

i use gdb(cygwin) to debug ruby, cygwin thinks  unc path \\?\ is appended to debugee path. but this could have been eliminated or leaved as it is. i suspeced that ruby thinks it as regular path and substitutes \ to /. the result is total disaster. it is clear that every corresponding native win32 api fails because there is no //?/ unc path.
(gdb)
0x62d4a4f1      2835        BUFINIT();
(gdb) print s
$5 = 0xc7dfa0 "//?/D:/ruby2/lib/ruby/site_ruby/1.9.1"
3072            HANDLE h = FindFirstFile(skipprefix(b), &wfd);
1: $eax = 0x0
(gdb) print b
$5 = 0xc7ec78 "//?/D:/ruby2/lib/ruby/site_ruby/1.9.1"


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