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-rw-r--r--string.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/string.c b/string.c
index a22505f592..35e53f7306 100644
--- a/string.c
+++ b/string.c
@@ -2742,6 +2742,7 @@ rb_str_concat(VALUE str1, VALUE str2)
{
unsigned int code;
rb_encoding *enc = STR_ENC_GET(str1);
+ int encidx;
if (FIXNUM_P(str2) || RB_TYPE_P(str2, T_BIGNUM)) {
if (rb_num_to_uint(str2, &code) == 0) {
@@ -2757,7 +2758,8 @@ rb_str_concat(VALUE str1, VALUE str2)
return rb_str_append(str1, str2);
}
- if (enc == rb_usascii_encoding()) {
+ encidx = rb_enc_to_index(enc);
+ if (encidx == ENCINDEX_ASCII || encidx == ENCINDEX_US_ASCII) {
/* US-ASCII automatically extended to ASCII-8BIT */
char buf[1];
buf[0] = (char)code;
@@ -2765,8 +2767,8 @@ rb_str_concat(VALUE str1, VALUE str2)
rb_raise(rb_eRangeError, "%u out of char range", code);
}
rb_str_cat(str1, buf, 1);
- if (code > 127) {
- rb_enc_associate_index(str1, rb_ascii8bit_encindex());
+ if (encidx == ENCINDEX_US_ASCII && code > 127) {
+ rb_enc_associate_index(str1, ENCINDEX_ASCII);
ENC_CODERANGE_SET(str1, ENC_CODERANGE_VALID);
}
}