/*
* The authors of this software are Rob Pike and Ken Thompson,
* with contributions from Mike Burrows and Sean Dorward.
*
* Copyright (c) 2002-2006 by Lucent Technologies.
* Portions Copyright (c) 2004 Google Inc.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose without fee is hereby granted, provided that this entire notice
* is included in all copies of any software which is or includes a copy
* or modification of this software and in all copies of the supporting
* documentation for such software.
* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTY. IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES
* NOR GOOGLE INC MAKE ANY REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING
* THE MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
*/
#include <u.h>
#include <libc.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 */
};
static struct
{
/* lock by calling __fmtlock, __fmtunlock */
int nfmt;
Convfmt fmt[Maxfmt];
} fmtalloc;
static Convfmt knownfmt[] = {
' ', __flagfmt,
'#', __flagfmt,
'%', __percentfmt,
'\'', __flagfmt,
'+', __flagfmt,
',', __flagfmt,
'-', __flagfmt,
'C', __runefmt, /* Plan 9 addition */
'E', __efgfmt,
#ifndef PLAN9PORT
'F', __efgfmt, /* ANSI only */
#endif
'G', __efgfmt,
#ifndef PLAN9PORT
'L', __flagfmt, /* ANSI only */
#endif
'S', __runesfmt, /* Plan 9 addition */
'X', __ifmt,
'b', __ifmt, /* Plan 9 addition */
'c', __charfmt,
'd', __ifmt,
'e', __efgfmt,
'f', __efgfmt,
'g', __efgfmt,
'h', __flagfmt,
#ifndef PLAN9PORT
'i', __ifmt, /* ANSI only */
#endif
'l', __flagfmt,
'n', __countfmt,
'o', __ifmt,
'p', __ifmt,
'r', __errfmt,
's', __strfmt,
#ifdef PLAN9PORT
'u', __flagfmt,
#else
'u', __ifmt,
#endif
'x', __ifmt,
0, nil,
};
int (*fmtdoquote)(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, int (*f)(Fmt*))
{
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){
while(p->fmt == nil) /* loop until value is updated */
;
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);
__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, (char*)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 + (int)r - '0';
if(isrunes){
r = *(Rune*)fmt;
fmt = (Rune*)fmt + 1;
}else{
r = (Rune)*(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){
/*
* negative precision =>
* ignore the precision.
*/
if(f->flags & FmtPrec){
f->flags &= ~(ulong)FmtPrec;
f->prec = 0;
continue;
}
i = -i;
f->flags |= FmtLeft;
}
goto numflag;
}
n = (*fmtfmt((int)r))(f);
if(n < 0)
return nil;
if(n == 0)
return fmt;
}
}