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mpfmt: handle base 2, 4

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This commit is contained in:
aiju 2015-12-20 13:45:28 +01:00
parent a8f8de1cde
commit bdc2b75568
1 changed files with 12 additions and 5 deletions
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17
sys/src/libmp/port/mpfmt.c
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@ -44,21 +44,22 @@ to32(mpint *b, char *buf, int len)
static char set16[] = "0123456789ABCDEF";
static int
to16(mpint *b, char *buf, int len)
topow2(mpint *b, char *buf, int len, int s)
{
mpdigit *p, x;
int i, j;
int i, j, sn;
char *out, *eout;
if(len < 1)
return -1;
sn = 1<<s;
out = buf;
eout = buf+len;
for(p = &b->p[b->top-1]; p >= b->p; p--){
x = *p;
for(i = Dbits-4; i >= 0; i -= 4){
j = 0xf & (x>>i);
for(i = Dbits-s; i >= 0; i -= s){
j = x >> i & sn - 1;
if(j != 0 || out != buf){
if(out >= eout)
return -1;
@ -190,11 +191,17 @@ mptoa(mpint *b, int base, char *buf, int len)
break;
default:
case 16:
rv = to16(b, out, len);
rv = topow2(b, out, len, 4);
break;
case 10:
rv = to10(b, out, len);
break;
case 4:
rv = topow2(b, out, len, 2);
break;
case 2:
rv = topow2(b, out, len, 1);
break;
}
if(rv < 0){
if(alloced)