2012-10-29 Daniel Colascione <dancol@dancol.org>

cygw32.h, cygw32.c (Qutf_16le, from_unicode, to_unicode): In
preparation for fixing bug#12739, move these functions from
here...

* coding.h, coding.c: ... to here, and compile them only when
WINDOWSNT or HAVE_NTGUI.  Moving these functions out of cygw32
proper lets us write cygw32-agnostic code for the HAVE_NTGUI case.

1 files changed, 42 insertions, 0 deletions

diff --git a/src/coding.c b/src/coding.c
index 7628a9fbf2e..611f92ea152 100644
--- a/src/coding.c
+++ b/src/coding.c
@@ -343,6 +343,10 @@ Lisp_Object Qcoding_system_p, Qcoding_system_error;
 Lisp_Object Qemacs_mule, Qraw_text;
 Lisp_Object Qutf_8_emacs;
 
+#if defined (WINDOWSNT) || defined (HAVE_NTGUI)
+static Lisp_Object Qutf_16le;
+#endif
+
 /* Coding-systems are handed between Emacs Lisp programs and C internal
    routines by the following three variables.  */
 /* Coding system to be used to encode text for terminal display when
@@ -7971,6 +7975,39 @@ preferred_coding_system (void)
   return CODING_ID_NAME (id);
 }
 
+#if defined (WINDOWSNT) || defined (HAVE_NTGUI)
+
+Lisp_Object
+from_unicode (Lisp_Object str)
+{
+  CHECK_STRING (str);
+  if (!STRING_MULTIBYTE (str) &&
+      SBYTES (str) & 1)
+    {
+      str = Fsubstring (str, make_number (0), make_number (-1));
+    }
+
+  return code_convert_string_norecord (str, Qutf_16le, 0);
+}
+
+wchar_t *
+to_unicode (Lisp_Object str, Lisp_Object *buf)
+{
+  *buf = code_convert_string_norecord (str, Qutf_16le, 1);
+  /* We need to make a another copy (in addition to the one made by
+     code_convert_string_norecord) to ensure that the final string is
+     _doubly_ zero terminated --- that is, that the string is
+     terminated by two zero bytes and one utf-16le null character.
+     Because strings are already terminated with a single zero byte,
+     we just add one additional zero. */
+  str = make_uninit_string (SBYTES (*buf) + 1);
+  memcpy (SDATA (str), SDATA (*buf), SBYTES (*buf));
+  SDATA (str) [SBYTES (*buf)] = '\0';
+  *buf = str;
+  return WCSDATA (*buf);
+}
+#endif /* WINDOWSNT || HAVE_NTGUI */
+
 
 #ifdef emacs
 /*** 8. Emacs Lisp library functions ***/
@@ -10284,6 +10321,11 @@ syms_of_coding (void)
   DEFSYM (Qutf_8, "utf-8");
   DEFSYM (Qutf_8_emacs, "utf-8-emacs");
 
+#if defined (WINDOWSNT) || defined (HAVE_NTGUI)
+  /* No, not utf-16-le: that one has a BOM.  */
+  DEFSYM (Qutf_16le, "utf-16le");
+#endif
+
   DEFSYM (Qutf_16, "utf-16");
   DEFSYM (Qbig, "big");
   DEFSYM (Qlittle, "little");