Parse [x] as x in single-byte locales even if x is an encoding error.

1 files changed, 15 insertions, 14 deletions

diff --git a/regcomp.c b/regcomp.c
index 4ddbade0..45410377 100644
--- a/regcomp.c
+++ b/regcomp.c
@@ -2694,6 +2694,19 @@ parse_dup_op (bin_tree_t *elem, re_string_t *regexp, re_dfa_t *dfa,
 #define BRACKET_NAME_BUF_SIZE 32
 
 #ifndef _LIBC
+
+# ifdef RE_ENABLE_I18N
+/* Convert the byte B to the corresponding wide character.  In a
+   unibyte locale, treat B as itself if it is an encoding error.
+   In a multibyte locale, return WEOF if B is an encoding error.  */
+static wint_t
+parse_byte (unsigned char b, re_charset_t *mbcset)
+{
+  wint_t wc = __btowc (b);
+  return wc == WEOF && !mbcset ? b : wc;
+}
+#endif
+
   /* Local function for parse_bracket_exp only used in case of NOT _LIBC.
      Build the range expression which starts from START_ELEM, and ends
      at END_ELEM.  The result are written to MBCSET and SBCSET.
@@ -2739,22 +2752,10 @@ build_range_exp (reg_syntax_t syntax, bitset_t sbcset,
     end_ch = ((end_elem->type == SB_CHAR) ? end_elem->opr.ch
 	      : ((end_elem->type == COLL_SYM) ? end_elem->opr.name[0]
 		 : 0));
-#ifdef GAWK
-    /*
-     * Fedora Core 2, maybe others, have broken `btowc' that returns -1
-     * for any value > 127. Sigh. Note that `start_ch' and `end_ch' are
-     * unsigned, so we don't have sign extension problems.
-     */
     start_wc = ((start_elem->type == SB_CHAR || start_elem->type == COLL_SYM)
-		? start_ch : start_elem->opr.wch);
+		? parse_byte (start_ch, mbcset) : start_elem->opr.wch);
     end_wc = ((end_elem->type == SB_CHAR || end_elem->type == COLL_SYM)
-	      ? end_ch : end_elem->opr.wch);
-#else
-    start_wc = ((start_elem->type == SB_CHAR || start_elem->type == COLL_SYM)
-		? __btowc (start_ch) : start_elem->opr.wch);
-    end_wc = ((end_elem->type == SB_CHAR || end_elem->type == COLL_SYM)
-	      ? __btowc (end_ch) : end_elem->opr.wch);
-#endif
+	      ? parse_byte (end_ch, mbcset) : end_elem->opr.wch);
     if (start_wc == WEOF || end_wc == WEOF)
       return REG_ECOLLATE;
     else if (BE ((syntax & RE_NO_EMPTY_RANGES) && start_wc > end_wc, 0))