string.c: skip invalid char gap

* string.c (enc_succ_alnum_char): try to skip an invalid character
  gap between GREEK CAPITAL RHO and SIGMA.
  [ruby-core:74478] [Bug #12204]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54210 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 11 insertions, 5 deletions

diff --git a/string.c b/string.c
index 2782d28e52..04d849f136 100644
--- a/string.c
+++ b/string.c
@@ -3552,6 +3552,10 @@ enc_succ_alnum_char(char *p, long len, rb_encoding *enc, char *carry)
     int range;
     char save[ONIGENC_CODE_TO_MBC_MAXLEN];
 
+    /* skip 03A2, invalid char between GREEK CAPITAL LETTERS */
+    int try;
+    const int max_gaps = 1;
+
     c = rb_enc_mbc_to_codepoint(p, p+len, enc);
     if (rb_enc_isctype(c, ONIGENC_CTYPE_DIGIT, enc))
         ctype = ONIGENC_CTYPE_DIGIT;
@@ -3561,11 +3565,13 @@ enc_succ_alnum_char(char *p, long len, rb_encoding *enc, char *carry)
         return NEIGHBOR_NOT_CHAR;
 
     MEMCPY(save, p, char, len);
-    ret = enc_succ_char(p, len, enc);
-    if (ret == NEIGHBOR_FOUND) {
-        c = rb_enc_mbc_to_codepoint(p, p+len, enc);
-        if (rb_enc_isctype(c, ctype, enc))
-            return NEIGHBOR_FOUND;
+    for (try = 0; try <= max_gaps; ++try) {
+	ret = enc_succ_char(p, len, enc);
+	if (ret == NEIGHBOR_FOUND) {
+	    c = rb_enc_mbc_to_codepoint(p, p+len, enc);
+	    if (rb_enc_isctype(c, ctype, enc))
+		return NEIGHBOR_FOUND;
+	}
     }
     MEMCPY(p, save, char, len);
     range = 1;