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Change integer to string function

This commit is contained in:
Calvin Rose 2017-04-30 11:27:27 -04:00
parent 78cdf4b184
commit 631bb0cb63
1 changed files with 23 additions and 1 deletions
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24
core/value.c
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@ -39,7 +39,29 @@ static const uint8_t *real_to_string(Gst *vm, GstReal x) {
static const uint8_t *integer_to_string(Gst *vm, GstInteger x) {
uint8_t buf[GST_BUFSIZE];
int count = snprintf((char *) buf, GST_BUFSIZE, "%lld", x);
int neg = 0;
uint8_t *hi, *low;
uint32_t count = 0;
if (x == 0) return gst_string_c(vm, "0");
if (x < 0) {
neg = 1;
x = -x;
}
while (x > 0) {
uint8_t digit = x % 10;
buf[count++] = '0' + digit;
x /= 10;
}
if (neg)
buf[count++] = '-';
/* Reverse */
hi = buf + count - 1;
low = buf;
while (hi > low) {
uint8_t temp = *low;
*low++ = *hi;
*hi-- = temp;
}
return gst_string_b(vm, buf, (uint32_t) count);
}