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-rw-r--r--bignum.c21
1 files changed, 16 insertions, 5 deletions
diff --git a/bignum.c b/bignum.c
index 738a490d7a..f14aaa725d 100644
--- a/bignum.c
+++ b/bignum.c
@@ -4224,13 +4224,23 @@ static size_t
big2str_orig(struct big2str_struct *b2s, VALUE x, char* ptr, size_t len, int trim)
{
long i = RBIGNUM_LEN(x);
- size_t j = len;
+ size_t j;
int k;
BDIGIT* ds = BDIGITS(x);
BDIGIT_DBL num;
+ char buf[SIZEOF_BDIGIT_DBL*CHAR_BIT], *p;
assert(i <= 2);
+ if (trim) {
+ p = buf;
+ j = sizeof(buf);
+ }
+ else {
+ p = ptr;
+ j = len;
+ }
+
num = 0;
if (0 < i)
num = ds[0];
@@ -4239,15 +4249,16 @@ big2str_orig(struct big2str_struct *b2s, VALUE x, char* ptr, size_t len, int tri
k = b2s->hbase2_numdigits;
while (k--) {
- ptr[--j] = ruby_digitmap[num % b2s->base];
+ p[--j] = ruby_digitmap[num % b2s->base];
num /= b2s->base;
if (j <= 0) break;
if (trim && num == 0) break;
}
if (trim) {
- while (j < len && ptr[j] == '0') j++;
- MEMMOVE(ptr, ptr + j, char, len - j);
- len -= j;
+ while (j < sizeof(buf) && p[j] == '0') j++;
+ assert(sizeof(buf)-j <= len);
+ MEMCPY(ptr, p + j, char, sizeof(buf) - j);
+ len = sizeof(buf) - j;
}
return len;
}