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Optimize js_isarrayindex.

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Avoid floating point number conversions.
This commit is contained in:
Tor Andersson
2017-05-23 13:15:11 +02:00
parent ebbc191fe1
commit be0685e89e
1 changed files with 13 additions and 5 deletions
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jsrun.c
+13 -5
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@@ -434,12 +434,20 @@ void js_rot(js_State *J, int n)
/* Property access that takes care of attributes and getters/setters */ /* Property access that takes care of attributes and getters/setters */
int js_isarrayindex(js_State *J, const char *str, int *idx) int js_isarrayindex(js_State *J, const char *p, int *idx)
{ {
char buf[32]; int n = 0;
*idx = jsV_numbertointeger(jsV_stringtonumber(J, str)); while (*p) {
sprintf(buf, "%u", *idx); int c = *p++;
return !strcmp(buf, str); if (c >= '0' && c <= '9') {
if (n > INT_MAX / 10 - 1)
return 0;
n = n * 10 + (c - '0');
} else {
return 0;
}
}
return *idx = n, 1;
} }
static void js_pushrune(js_State *J, Rune rune) static void js_pushrune(js_State *J, Rune rune)