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Some minor optimizations to Ap_join.

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This commit is contained in:
Tor Andersson
2022-02-23 14:11:44 +01:00
parent a2b628c9cb
commit 4586e81832
1 changed files with 23 additions and 18 deletions
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41
jsarray.c
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@@ -91,7 +91,7 @@ static void Ap_join(js_State *J)
const char *sep;
const char *r;
int seplen;
int k, n, len, outlen, rlen;
int k, n, len, rlen;
len = js_getlength(J, 0);
@@ -113,35 +113,40 @@ static void Ap_join(js_State *J)
js_throw(J);
}
n = 1;
n = 0;
for (k = 0; k < len; ++k) {
js_getindex(J, 0, k);
if (js_isundefined(J, -1) || js_isnull(J, -1))
r = "";
else
if (js_iscoercible(J, -1)) {
r = js_tostring(J, -1);
outlen = n - 1;
rlen = strlen(r);
n += rlen;
rlen = strlen(r);
} else {
rlen = 0;
}
if (k == 0) {
if (n > JS_STRLIMIT)
js_rangeerror(J, "invalid string length");
out = js_malloc(J, (int)n);
memcpy(out, r, rlen + 1);
out = js_malloc(J, rlen + 1);
if (rlen > 0) {
memcpy(out, r, rlen);
n += rlen;
}
} else {
n += seplen;
if (n > JS_STRLIMIT)
if (n + seplen + rlen > JS_STRLIMIT)
js_rangeerror(J, "invalid string length");
out = js_realloc(J, out, (int)n);
memcpy(out + outlen, sep, seplen);
memcpy(out + outlen + seplen, r, rlen + 1);
out = js_realloc(J, out, n + seplen + rlen + 1);
if (seplen > 0) {
memcpy(out + n, sep, seplen);
n += seplen;
}
if (rlen > 0) {
memcpy(out + n, r, rlen);
n += rlen;
}
}
js_pop(J, 1);
}
js_pushstring(J, out);
js_pushlstring(J, out, n);
js_endtry(J);
js_free(J, out);
}