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Fix bugs in Number.prototype.toFixed and toExponential.

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toPrecision does not behave correctly: it doesn't pad the number with
trailing zeroes to reach the desired precision.
This commit is contained in:
Tor Andersson
2019-02-06 14:04:18 +01:00
parent 28643e6afb
commit 5f556004a2
1 changed files with 33 additions and 16 deletions
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33
jsnumber.c
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@@ -116,12 +116,6 @@ static void Np_toString(js_State *J)
static void numtostr(js_State *J, const char *fmt, int w, double n)
{
char buf[32], *e;
if (isnan(n)) js_pushliteral(J, "NaN");
else if (isinf(n)) js_pushliteral(J, n < 0 ? "-Infinity" : "Infinity");
else if (n == 0) js_pushliteral(J, "0");
else {
if (w < 1) w = 1;
if (w > 17) w = 17;
sprintf(buf, fmt, w, n);
e = strchr(buf, 'e');
if (e) {
@@ -130,21 +124,36 @@ static void numtostr(js_State *J, const char *fmt, int w, double n)
}
js_pushstring(J, buf);
}
}
static void Np_toFixed(js_State *J)
{
js_Object *self = js_toobject(J, 0);
int width = js_tointeger(J, 1);
char buf[32];
double x;
if (self->type != JS_CNUMBER) js_typeerror(J, "not a number");
numtostr(J, "%.*f", width, self->u.number);
if (width < 0) js_rangeerror(J, "precision %d out of range", width);
if (width > 20) js_rangeerror(J, "precision %d out of range", width);
x = self->u.number;
if (isnan(x) || isinf(x) || x <= -1e21 || x >= 1e21)
js_pushstring(J, jsV_numbertostring(J, buf, x));
else
numtostr(J, "%.*f", width, x);
}
static void Np_toExponential(js_State *J)
{
js_Object *self = js_toobject(J, 0);
int width = js_tointeger(J, 1);
char buf[32];
double x;
if (self->type != JS_CNUMBER) js_typeerror(J, "not a number");
if (width < 0) js_rangeerror(J, "precision %d out of range", width);
if (width > 20) js_rangeerror(J, "precision %d out of range", width);
x = self->u.number;
if (isnan(x) || isinf(x))
js_pushstring(J, jsV_numbertostring(J, buf, x));
else
numtostr(J, "%.*e", width, self->u.number);
}
@@ -152,7 +161,15 @@ static void Np_toPrecision(js_State *J)
{
js_Object *self = js_toobject(J, 0);
int width = js_tointeger(J, 1);
char buf[32];
double x;
if (self->type != JS_CNUMBER) js_typeerror(J, "not a number");
if (width < 1) js_rangeerror(J, "precision %d out of range", width);
if (width > 21) js_rangeerror(J, "precision %d out of range", width);
x = self->u.number;
if (isnan(x) || isinf(x))
js_pushstring(J, jsV_numbertostring(J, buf, x));
else
numtostr(J, "%.*g", width, self->u.number);
}