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reimplement String#*

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This commit is contained in:
Yukihiro Matsumoto
2012-05-31 16:34:57 +09:00
parent 5450f925da
commit 3055a3bc8c
1 changed files with 27 additions and 1 deletions
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src/string.c
+27 -1
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@@ -402,7 +402,33 @@ mrb_str_size(mrb_state *mrb, mrb_value self)
static mrb_value
mrb_str_times(mrb_state *mrb, mrb_value self)
{
return mrb_nil_value();
mrb_value str2;
mrb_int n,len,times;
char *ptr2;
mrb_get_args(mrb, "i", &times);
if (times < 0) {
mrb_raise(mrb, E_ARGUMENT_ERROR, "negative argument");
}
if (times && INT32_MAX/times < RSTRING_LEN(self)) {
mrb_raise(mrb, E_ARGUMENT_ERROR, "argument too big");
}
len = RSTRING_LEN(self)*times;
str2 = mrb_str_new_with_class(mrb, self, 0, len);
ptr2 = RSTRING_PTR(str2);
if (len > 0) {
n = RSTRING_LEN(self);
memcpy(ptr2, RSTRING_PTR(self), n);
while (n <= len/2) {
memcpy(ptr2 + n, ptr2, n);
n *= 2;
}
memcpy(ptr2 + n, ptr2, len-n);
}
ptr2[RSTRING_LEN(str2)] = '\0';
return str2;
}
/* -------------------------------------------------------------- */