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* string.c (rb_str_sub_bang): trivial optimization.

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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@25564 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2009-10-29 19:44:58 +00:00
parent 5e74593701
commit 2aa4d69d78
1 changed files with 17 additions and 14 deletions
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31
string.c
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@ -3461,9 +3461,11 @@ rb_str_sub_bang(int argc, VALUE *argv, VALUE str)
struct re_registers *regs = RMATCH_REGS(match);
long beg0 = BEG(0);
long end0 = END(0);
char *p, *rp;
long len, rlen;
if (iter || !NIL_P(hash)) {
char *p = RSTRING_PTR(str); long len = RSTRING_LEN(str);
p = RSTRING_PTR(str); len = RSTRING_LEN(str);
if (iter) {
repl = rb_obj_as_string(rb_yield(rb_reg_nth_match(0, match)));
@ -3481,9 +3483,9 @@ rb_str_sub_bang(int argc, VALUE *argv, VALUE str)
enc = rb_enc_compatible(str, repl);
if (!enc) {
rb_encoding *str_enc = STR_ENC_GET(str);
if (coderange_scan(RSTRING_PTR(str), beg0, str_enc) != ENC_CODERANGE_7BIT ||
coderange_scan(RSTRING_PTR(str)+end0,
RSTRING_LEN(str)-end0, str_enc) != ENC_CODERANGE_7BIT) {
p = RSTRING_PTR(str); len = RSTRING_LEN(str);
if (coderange_scan(p, beg0, str_enc) != ENC_CODERANGE_7BIT ||
coderange_scan(p+end0, len-end0, str_enc) != ENC_CODERANGE_7BIT) {
rb_raise(rb_eEncCompatError, "incompatible character encodings: %s and %s",
rb_enc_name(str_enc),
rb_enc_name(STR_ENC_GET(repl)));
@ -3503,18 +3505,19 @@ rb_str_sub_bang(int argc, VALUE *argv, VALUE str)
cr = cr2;
}
plen = end0 - beg0;
if (RSTRING_LEN(repl) > plen) {
RESIZE_CAPA(str, RSTRING_LEN(str) + RSTRING_LEN(repl) - plen);
rp = RSTRING_PTR(repl); rlen = RSTRING_LEN(repl);
len = RSTRING_LEN(str);
if (rlen > plen) {
RESIZE_CAPA(str, len + rlen - plen);
}
if (RSTRING_LEN(repl) != plen) {
memmove(RSTRING_PTR(str) + beg0 + RSTRING_LEN(repl),
RSTRING_PTR(str) + beg0 + plen,
RSTRING_LEN(str) - beg0 - plen);
p = RSTRING_PTR(str);
if (rlen != plen) {
memmove(p + beg0 + rlen, p + beg0 + plen, len - beg0 - plen);
}
memcpy(RSTRING_PTR(str) + beg0,
RSTRING_PTR(repl), RSTRING_LEN(repl));
STR_SET_LEN(str, RSTRING_LEN(str) + RSTRING_LEN(repl) - plen);
RSTRING_PTR(str)[RSTRING_LEN(str)] = '\0';
memcpy(p + beg0, rp, rlen);
len += rlen - plen;
STR_SET_LEN(str, len);
RSTRING_PTR(str)[len] = '\0';
ENC_CODERANGE_SET(str, cr);
if (tainted) OBJ_TAINT(str);
if (untrusted) OBJ_UNTRUST(str);