ref: bd6c2aad586814b091ce5aca9d41cf2c51adb37b
dir: /lib9/dofmt.c/
/*
* The authors of this software are Rob Pike and Ken Thompson.
* Copyright (c) 2002 by Lucent Technologies.
* 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 MAKE ANY
* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
* OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
*/
#include "lib9.h"
#include "fmtdef.h"
/* format the output into f->to and return the number of characters fmted */
int
dofmt(Fmt *f, char *fmt)
{
Rune rune, *rt, *rs;
int r;
char *t, *s;
int n, nfmt;
nfmt = f->nfmt;
for(;;){
if(f->runes){
rt = f->to;
rs = f->stop;
while((r = *(uchar*)fmt) && r != '%'){
if(r < Runeself)
fmt++;
else{
fmt += chartorune(&rune, fmt);
r = rune;
}
FMTRCHAR(f, rt, rs, r);
}
fmt++;
f->nfmt += rt - (Rune *)f->to;
f->to = rt;
if(!r)
return f->nfmt - nfmt;
f->stop = rs;
}else{
t = f->to;
s = f->stop;
while((r = *(uchar*)fmt) && r != '%'){
if(r < Runeself){
FMTCHAR(f, t, s, r);
fmt++;
}else{
n = chartorune(&rune, fmt);
if(t + n > s){
t = _fmtflush(f, t, n);
if(t != nil)
s = f->stop;
else
return -1;
}
while(n--)
*t++ = *fmt++;
}
}
fmt++;
f->nfmt += t - (char *)f->to;
f->to = t;
if(!r)
return f->nfmt - nfmt;
f->stop = s;
}
fmt = _fmtdispatch(f, fmt, 0);
if(fmt == nil)
return -1;
}
}
void *
_fmtflush(Fmt *f, void *t, int len)
{
if(f->runes)
f->nfmt += (Rune*)t - (Rune*)f->to;
else
f->nfmt += (char*)t - (char *)f->to;
f->to = t;
if(f->flush == 0 || (*f->flush)(f) == 0 || (char*)f->to + len > (char*)f->stop){
f->stop = f->to;
return nil;
}
return f->to;
}
/*
* put a formatted block of memory sz bytes long of n runes into the output buffer,
* left/right justified in a field of at least f->width charactes
*/
int
_fmtpad(Fmt *f, int n)
{
char *t, *s;
int i;
t = f->to;
s = f->stop;
for(i = 0; i < n; i++)
FMTCHAR(f, t, s, ' ');
f->nfmt += t - (char *)f->to;
f->to = t;
return 0;
}
int
_rfmtpad(Fmt *f, int n)
{
Rune *t, *s;
int i;
t = f->to;
s = f->stop;
for(i = 0; i < n; i++)
FMTRCHAR(f, t, s, ' ');
f->nfmt += t - (Rune *)f->to;
f->to = t;
return 0;
}
int
_fmtcpy(Fmt *f, void *vm, int n, int sz)
{
Rune *rt, *rs, r;
char *t, *s, *m, *me;
ulong fl;
int nc, w;
m = vm;
me = m + sz;
w = f->width;
fl = f->flags;
if((fl & FmtPrec) && n > f->prec)
n = f->prec;
if(f->runes){
if(!(fl & FmtLeft) && _rfmtpad(f, w - n) < 0)
return -1;
rt = f->to;
rs = f->stop;
for(nc = n; nc > 0; nc--){
r = *(uchar*)m;
if(r < Runeself)
m++;
else if((me - m) >= UTFmax || fullrune(m, me-m))
m += chartorune(&r, m);
else
break;
FMTRCHAR(f, rt, rs, r);
}
f->nfmt += rt - (Rune *)f->to;
f->to = rt;
if(m < me)
return -1;
if(fl & FmtLeft && _rfmtpad(f, w - n) < 0)
return -1;
}else{
if(!(fl & FmtLeft) && _fmtpad(f, w - n) < 0)
return -1;
t = f->to;
s = f->stop;
for(nc = n; nc > 0; nc--){
r = *(uchar*)m;
if(r < Runeself)
m++;
else if((me - m) >= UTFmax || fullrune(m, me-m))
m += chartorune(&r, m);
else
break;
FMTRUNE(f, t, s, r);
}
f->nfmt += t - (char *)f->to;
f->to = t;
if(fl & FmtLeft && _fmtpad(f, w - n) < 0)
return -1;
}
return 0;
}
int
_fmtrcpy(Fmt *f, void *vm, int n)
{
Rune r, *m, *me, *rt, *rs;
char *t, *s;
ulong fl;
int w;
m = vm;
w = f->width;
fl = f->flags;
if((fl & FmtPrec) && n > f->prec)
n = f->prec;
if(f->runes){
if(!(fl & FmtLeft) && _rfmtpad(f, w - n) < 0)
return -1;
rt = f->to;
rs = f->stop;
for(me = m + n; m < me; m++)
FMTRCHAR(f, rt, rs, *m);
f->nfmt += rt - (Rune *)f->to;
f->to = rt;
if(fl & FmtLeft && _rfmtpad(f, w - n) < 0)
return -1;
}else{
if(!(fl & FmtLeft) && _fmtpad(f, w - n) < 0)
return -1;
t = f->to;
s = f->stop;
for(me = m + n; m < me; m++){
r = *m;
FMTRUNE(f, t, s, r);
}
f->nfmt += t - (char *)f->to;
f->to = t;
if(fl & FmtLeft && _fmtpad(f, w - n) < 0)
return -1;
}
return 0;
}
/* fmt out one character */
int
_charfmt(Fmt *f)
{
char x[1];
x[0] = va_arg(f->args, int);
f->prec = 1;
return _fmtcpy(f, x, 1, 1);
}
/* fmt out one rune */
int
_runefmt(Fmt *f)
{
Rune x[1];
x[0] = va_arg(f->args, int);
return _fmtrcpy(f, x, 1);
}
/* public helper routine: fmt out a null terminated string already in hand */
int
fmtstrcpy(Fmt *f, char *s)
{
int p, i;
if(!s)
return _fmtcpy(f, "<nil>", 5, 5);
/* if precision is specified, make sure we don't wander off the end */
if(f->flags & FmtPrec){
p = f->prec;
for(i = 0; i < p; i++)
if(s[i] == 0)
break;
return _fmtcpy(f, s, utfnlen(s, i), i); /* BUG?: won't print a partial rune at end */
}
return _fmtcpy(f, s, utflen(s), strlen(s));
}
/* fmt out a null terminated utf string */
int
_strfmt(Fmt *f)
{
char *s;
s = va_arg(f->args, char *);
return fmtstrcpy(f, s);
}
/* public helper routine: fmt out a null terminated rune string already in hand */
int
fmtrunestrcpy(Fmt *f, Rune *s)
{
Rune *e;
int n, p;
if(!s)
return _fmtcpy(f, "<nil>", 5, 5);
/* if precision is specified, make sure we don't wander off the end */
if(f->flags & FmtPrec){
p = f->prec;
for(n = 0; n < p; n++)
if(s[n] == 0)
break;
}else{
for(e = s; *e; e++)
;
n = e - s;
}
return _fmtrcpy(f, s, n);
}
/* fmt out a null terminated rune string */
int
_runesfmt(Fmt *f)
{
Rune *s;
s = va_arg(f->args, Rune *);
return fmtrunestrcpy(f, s);
}
/* fmt a % */
int
_percentfmt(Fmt *f)
{
Rune x[1];
x[0] = f->r;
f->prec = 1;
return _fmtrcpy(f, x, 1);
}
/* fmt an integer */
int
_ifmt(Fmt *f)
{
char buf[70], *p, *conv;
uvlong vu;
ulong u;
int neg, base, i, n, fl, w, isv;
neg = 0;
fl = f->flags;
isv = 0;
vu = 0;
u = 0;
if(f->r == 'p'){
u = (ulong)va_arg(f->args, void*);
f->r = 'x';
fl |= FmtUnsigned;
}else if(fl & FmtVLong){
isv = 1;
if(fl & FmtUnsigned)
vu = va_arg(f->args, uvlong);
else
vu = va_arg(f->args, vlong);
}else if(fl & FmtLong){
if(fl & FmtUnsigned)
u = va_arg(f->args, ulong);
else
u = va_arg(f->args, long);
}else if(fl & FmtByte){
if(fl & FmtUnsigned)
u = (uchar)va_arg(f->args, int);
else
u = (char)va_arg(f->args, int);
}else if(fl & FmtShort){
if(fl & FmtUnsigned)
u = (ushort)va_arg(f->args, int);
else
u = (short)va_arg(f->args, int);
}else{
if(fl & FmtUnsigned)
u = va_arg(f->args, uint);
else
u = va_arg(f->args, int);
}
conv = "0123456789abcdef";
switch(f->r){
case 'd':
base = 10;
break;
case 'x':
base = 16;
break;
case 'X':
base = 16;
conv = "0123456789ABCDEF";
break;
case 'b':
base = 2;
break;
case 'o':
base = 8;
break;
default:
return -1;
}
if(!(fl & FmtUnsigned)){
if(isv && (vlong)vu < 0){
vu = -(vlong)vu;
neg = 1;
}else if(!isv && (long)u < 0){
u = -(long)u;
neg = 1;
}
}
p = buf + sizeof buf - 1;
n = 0;
if(isv){
while(vu){
i = vu % base;
vu /= base;
if((fl & FmtComma) && n % 4 == 3){
*p-- = ',';
n++;
}
*p-- = conv[i];
n++;
}
}else{
while(u){
i = u % base;
u /= base;
if((fl & FmtComma) && n % 4 == 3){
*p-- = ',';
n++;
}
*p-- = conv[i];
n++;
}
}
if(n == 0){
*p-- = '0';
n = 1;
}
for(w = f->prec; n < w && p > buf+3; n++)
*p-- = '0';
if(neg || (fl & (FmtSign|FmtSpace)))
n++;
if(fl & FmtSharp){
if(base == 16)
n += 2;
else if(base == 8){
if(p[1] == '0')
fl &= ~FmtSharp;
else
n++;
}
}
if((fl & FmtZero) && !(fl & FmtLeft)){
for(w = f->width; n < w && p > buf+3; n++)
*p-- = '0';
f->width = 0;
}
if(fl & FmtSharp){
if(base == 16)
*p-- = f->r;
if(base == 16 || base == 8)
*p-- = '0';
}
if(neg)
*p-- = '-';
else if(fl & FmtSign)
*p-- = '+';
else if(fl & FmtSpace)
*p-- = ' ';
f->flags &= ~FmtPrec;
return _fmtcpy(f, p + 1, n, n);
}
int
_countfmt(Fmt *f)
{
void *p;
ulong fl;
fl = f->flags;
p = va_arg(f->args, void*);
if(fl & FmtVLong){
*(vlong*)p = f->nfmt;
}else if(fl & FmtLong){
*(long*)p = f->nfmt;
}else if(fl & FmtByte){
*(char*)p = f->nfmt;
}else if(fl & FmtShort){
*(short*)p = f->nfmt;
}else{
*(int*)p = f->nfmt;
}
return 0;
}
int
_flagfmt(Fmt *f)
{
switch(f->r){
case ',':
f->flags |= FmtComma;
break;
case '-':
f->flags |= FmtLeft;
break;
case '+':
f->flags |= FmtSign;
break;
case '#':
f->flags |= FmtSharp;
break;
case ' ':
f->flags |= FmtSpace;
break;
case 'u':
f->flags |= FmtUnsigned;
break;
case 'h':
if(f->flags & FmtShort)
f->flags |= FmtByte;
f->flags |= FmtShort;
break;
case 'l':
if(f->flags & FmtLong)
f->flags |= FmtVLong;
f->flags |= FmtLong;
break;
}
return 1;
}
/* default error format */
int
_badfmt(Fmt *f)
{
char x[3];
x[0] = '%';
x[1] = f->r;
x[2] = '%';
f->prec = 3;
_fmtcpy(f, x, 3, 3);
return 0;
}