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#include "os.h"
#include "fmtdef.h"
enum
{
Maxfmt = 64
};
typedef struct Convfmt Convfmt;
struct Convfmt
{
int c;
volatile Fmts fmt; /* for spin lock in fmtfmt; avoids race due to write order */
};
struct
{
/* lock by calling _fmtlock, _fmtunlock */
int nfmt;
Convfmt fmt[Maxfmt];
} fmtalloc;
static Convfmt knownfmt[] = {
{ ' ', _flagfmt },
{ '#', _flagfmt },
{ '%', _percentfmt },
{ '+', _flagfmt },
{ ',', _flagfmt },
{ '-', _flagfmt },
{ 'C', _runefmt },
/*
{ 'E', _efgfmt },
{ 'G', _efgfmt },
*/
{ 'S', _runesfmt },
{ 'X', _ifmt },
{ 'b', _ifmt },
{ 'c', _charfmt },
{ 'd', _ifmt },
/*
{ 'e', _efgfmt },
{ 'f', _efgfmt },
{ 'g', _efgfmt },
*/
{ 'h', _flagfmt },
{ 'l', _flagfmt },
{ 'n', _countfmt },
{ 'o', _ifmt },
{ 'p', _ifmt },
{ 'r', errfmt },
{ 's', _strfmt },
{ 'u', _flagfmt },
{ 'x', _ifmt },
{ 0, nil }
};
int (*doquote)(int);
/*
* _fmtlock() must be set
*/
static int
_fmtinstall(int c, Fmts f)
{
Convfmt *p, *ep;
if(c<=0 || c>=65536)
return -1;
if(!f)
f = _badfmt;
ep = &fmtalloc.fmt[fmtalloc.nfmt];
for(p=fmtalloc.fmt; p<ep; p++)
if(p->c == c)
break;
if(p == &fmtalloc.fmt[Maxfmt])
return -1;
p->fmt = f;
if(p == ep){ /* installing a new format character */
fmtalloc.nfmt++;
p->c = c;
}
return 0;
}
int
fmtinstall(int c, Fmts f)
{
int ret;
_fmtlock();
ret = _fmtinstall(c, f);
_fmtunlock();
return ret;
}
static Fmts
fmtfmt(int c)
{
Convfmt *p, *ep;
ep = &fmtalloc.fmt[fmtalloc.nfmt];
for(p=fmtalloc.fmt; p<ep; p++)
if(p->c == c)
return p->fmt;
/* is this a predefined format char? */
_fmtlock();
for(p=knownfmt; p->c; p++)
if(p->c == c){
_fmtinstall(p->c, p->fmt);
while(p->fmt == nil) /* loop until value is updated */
;
_fmtunlock();
return p->fmt;
}
_fmtunlock();
return _badfmt;
}
void*
_fmtdispatch(Fmt *f, void *fmt, int isrunes)
{
Rune rune, r;
int i, n;
f->flags = 0;
f->width = f->prec = 0;
for(;;){
if(isrunes){
r = *(Rune*)fmt;
fmt = (Rune*)fmt + 1;
}else{
fmt = (char*)fmt + chartorune(&rune, fmt);
r = rune;
}
f->r = r;
switch(r){
case '\0':
return nil;
case '.':
f->flags |= FmtWidth|FmtPrec;
continue;
case '0':
if(!(f->flags & FmtWidth)){
f->flags |= FmtZero;
continue;
}
/* fall through */
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
i = 0;
while(r >= '0' && r <= '9'){
i = i * 10 + r - '0';
if(isrunes){
r = *(Rune*)fmt;
fmt = (Rune*)fmt + 1;
}else{
r = *(char*)fmt;
fmt = (char*)fmt + 1;
}
}
if(isrunes)
fmt = (Rune*)fmt - 1;
else
fmt = (char*)fmt - 1;
numflag:
if(f->flags & FmtWidth){
f->flags |= FmtPrec;
f->prec = i;
}else{
f->flags |= FmtWidth;
f->width = i;
}
continue;
case '*':
i = va_arg(f->args, int);
if(i < 0){
i = -i;
f->flags |= FmtLeft;
}
goto numflag;
}
n = (*fmtfmt(r))(f);
if(n < 0)
return nil;
if(n == 0)
return fmt;
}
}
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