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#include "all.h"
#define PTR sizeof(char*)
#define SHORT sizeof(int)
#define INT sizeof(int)
#define LONG sizeof(long)
#define IDIGIT 30
#define MAXCON 30
static int convcount = { 10 };
#define PUT(o, c) if((o)->p < (o)->ep) *(o)->p++ = c
static int noconv(Op*);
static int cconv(Op*);
static int dconv(Op*);
static int hconv(Op*);
static int lconv(Op*);
static int oconv(Op*);
static int sconv(Op*);
static int uconv(Op*);
static int xconv(Op*);
static int percent(Op*);
static
int (*fmtconv[MAXCON])(Op*) =
{
noconv,
cconv, dconv, hconv, lconv,
oconv, sconv, uconv, xconv,
percent,
};
static
char fmtindex[128] =
{
['c'] 1,
['d'] 2,
['h'] 3,
['l'] 4,
['o'] 5,
['s'] 6,
['u'] 7,
['x'] 8,
['%'] 9,
};
int
fmtinstall(char c, int (*f)(Op*))
{
c &= 0177;
if(fmtindex[c] == 0) {
if(convcount >= MAXCON)
return 1;
fmtindex[c] = convcount++;
}
fmtconv[fmtindex[c]] = f;
return 0;
}
char*
doprint(char *p, char *ep, char *fmt, void *argp)
{
int sf1, c;
Op o;
o.p = p;
o.ep = ep;
o.argp = argp;
loop:
c = *fmt++;
if(c != '%') {
if(c == 0) {
if(o.p < o.ep)
*o.p = 0;
return o.p;
}
PUT(&o, c);
goto loop;
}
o.f1 = 0;
o.f2 = -1;
o.f3 = 0;
c = *fmt++;
sf1 = 0;
if(c == '-') {
sf1 = 1;
c = *fmt++;
}
while(c >= '0' && c <= '9') {
o.f1 = o.f1*10 + c-'0';
c = *fmt++;
}
if(sf1)
o.f1 = -o.f1;
if(c != '.')
goto l1;
c = *fmt++;
while(c >= '0' && c <= '9') {
if(o.f2 < 0)
o.f2 = 0;
o.f2 = o.f2*10 + c-'0';
c = *fmt++;
}
l1:
if(c == 0)
fmt--;
c = (*fmtconv[fmtindex[c&0177]])(&o);
if(c < 0) {
o.f3 |= -c;
c = *fmt++;
goto l1;
}
o.argp = (char*)o.argp + c;
goto loop;
}
int
numbconv(Op *op, int base)
{
char b[IDIGIT];
int i, f, n, r;
long v;
short h;
f = 0;
switch(op->f3 & (FLONG|FSHORT|FUNSIGN)) {
case FLONG:
v = *(long*)op->argp;
r = LONG;
break;
case FUNSIGN|FLONG:
v = *(ulong*)op->argp;
r = LONG;
break;
case FSHORT:
h = *(int*)op->argp;
v = h;
r = SHORT;
break;
case FUNSIGN|FSHORT:
h = *(int*)op->argp;
v = (ushort)h;
r = SHORT;
break;
default:
v = *(int*)op->argp;
r = INT;
break;
case FUNSIGN:
v = *(unsigned*)op->argp;
r = INT;
break;
}
if(!(op->f3 & FUNSIGN) && v < 0) {
v = -v;
f = 1;
}
b[IDIGIT-1] = 0;
for(i = IDIGIT-2;; i--) {
n = (ulong)v % base;
n += '0';
if(n > '9')
n += 'a' - ('9'+1);
b[i] = n;
if(i < 2)
break;
v = (ulong)v / base;
if(op->f2 >= 0 && i >= IDIGIT-op->f2)
continue;
if(v <= 0)
break;
}
sout:
if(f)
b[--i] = '-';
strconv(b+i, op, op->f1, -1);
return r;
}
void
strconv(char *o, Op *op, int f1, int f2)
{
int n, c;
char *p;
n = strlen(o);
if(f1 >= 0)
while(n < f1) {
PUT(op, ' ');
n++;
}
for(p=o; c = *p++;)
if(f2 != 0) {
PUT(op, c);
f2--;
}
if(f1 < 0) {
f1 = -f1;
while(n < f1) {
PUT(op, ' ');
n++;
}
}
}
static int
noconv(Op *op)
{
strconv("***", op, 0, -1);
return 0;
}
static int
cconv(Op *op)
{
char b[2];
b[0] = *(int*)op->argp;
b[1] = 0;
strconv(b, op, op->f1, -1);
return INT;
}
static int
dconv(Op *op)
{
return numbconv(op, 10);
}
static int
hconv(Op *op)
{
USED(op);
return -FSHORT;
}
static int
lconv(Op *op)
{
USED(op);
return -FLONG;
}
static int
oconv(Op *op)
{
USED(op);
return numbconv(op, 8);
}
static int
sconv(Op *op)
{
strconv(*(char**)op->argp, op, op->f1, op->f2);
return PTR;
}
static int
uconv(Op *op)
{
USED(op);
return -FUNSIGN;
}
static int
xconv(Op *op)
{
return numbconv(op, 16);
}
static int
percent(Op *op)
{
PUT(op, '%');
return 0;
}
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