ref: 7ade57b678f0799ab0598632403da11fd7271b05
dir: /sys/src/libstdio/vfprintf.c/
/*
* pANS stdio -- vfprintf
*/
#include "iolib.h"
/*
* Leading flags
*/
#define SPACE 1 /* ' ' prepend space if no sign printed */
#define ALT 2 /* '#' use alternate conversion */
#define SIGN 4 /* '+' prepend sign, even if positive */
#define LEFT 8 /* '-' left-justify */
#define ZPAD 16 /* '0' zero-pad */
/*
* Trailing flags
*/
#define SHORT 32 /* 'h' convert a short integer */
#define LONG 64 /* 'l' convert a long integer */
#define LDBL 128 /* 'L' convert a long double */
#define PTR 256 /* convert a void * (%p) */
static int lflag[] = { /* leading flags */
0, 0, 0, 0, 0, 0, 0, 0, /* ^@ ^A ^B ^C ^D ^E ^F ^G */
0, 0, 0, 0, 0, 0, 0, 0, /* ^H ^I ^J ^K ^L ^M ^N ^O */
0, 0, 0, 0, 0, 0, 0, 0, /* ^P ^Q ^R ^S ^T ^U ^V ^W */
0, 0, 0, 0, 0, 0, 0, 0, /* ^X ^Y ^Z ^[ ^\ ^] ^^ ^_ */
SPACE, 0, 0, ALT, 0, 0, 0, 0, /* sp ! " # $ % & ' */
0, 0, 0, SIGN, 0, LEFT, 0, 0, /* ( ) * + , - . / */
ZPAD, 0, 0, 0, 0, 0, 0, 0, /* 0 1 2 3 4 5 6 7 */
0, 0, 0, 0, 0, 0, 0, 0, /* 8 9 : ; < = > ? */
0, 0, 0, 0, 0, 0, 0, 0, /* @ A B C D E F G */
0, 0, 0, 0, 0, 0, 0, 0, /* H I J K L M N O */
0, 0, 0, 0, 0, 0, 0, 0, /* P Q R S T U V W */
0, 0, 0, 0, 0, 0, 0, 0, /* X Y Z [ \ ] ^ _ */
0, 0, 0, 0, 0, 0, 0, 0, /* ` a b c d e f g */
0, 0, 0, 0, 0, 0, 0, 0, /* h i j k l m n o */
0, 0, 0, 0, 0, 0, 0, 0, /* p q r s t u v w */
0, 0, 0, 0, 0, 0, 0, 0, /* x y z { | } ~ ^? */
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
};
static int tflag[] = { /* trailing flags */
0, 0, 0, 0, 0, 0, 0, 0, /* ^@ ^A ^B ^C ^D ^E ^F ^G */
0, 0, 0, 0, 0, 0, 0, 0, /* ^H ^I ^J ^K ^L ^M ^N ^O */
0, 0, 0, 0, 0, 0, 0, 0, /* ^P ^Q ^R ^S ^T ^U ^V ^W */
0, 0, 0, 0, 0, 0, 0, 0, /* ^X ^Y ^Z ^[ ^\ ^] ^^ ^_ */
0, 0, 0, 0, 0, 0, 0, 0, /* sp ! " # $ % & ' */
0, 0, 0, 0, 0, 0, 0, 0, /* ( ) * + , - . / */
0, 0, 0, 0, 0, 0, 0, 0, /* 0 1 2 3 4 5 6 7 */
0, 0, 0, 0, 0, 0, 0, 0, /* 8 9 : ; < = > ? */
0, 0, 0, 0, 0, 0, 0, 0, /* @ A B C D E F G */
0, 0, 0, 0, LDBL, 0, 0, 0, /* H I J K L M N O */
0, 0, 0, 0, 0, 0, 0, 0, /* P Q R S T U V W */
0, 0, 0, 0, 0, 0, 0, 0, /* X Y Z [ \ ] ^ _ */
0, 0, 0, 0, 0, 0, 0, 0, /* ` a b c d e f g */
SHORT, 0, 0, 0, LONG, 0, 0, 0, /* h i j k l m n o */
0, 0, 0, 0, 0, 0, 0, 0, /* p q r s t u v w */
0, 0, 0, 0, 0, 0, 0, 0, /* x y z { | } ~ ^? */
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
};
static int ocvt_E(FILE *, va_list *, int, int, int);
static int ocvt_G(FILE *, va_list *, int, int, int);
static int ocvt_X(FILE *, va_list *, int, int, int);
static int ocvt_c(FILE *, va_list *, int, int, int);
static int ocvt_d(FILE *, va_list *, int, int, int);
static int ocvt_e(FILE *, va_list *, int, int, int);
static int ocvt_f(FILE *, va_list *, int, int, int);
static int ocvt_g(FILE *, va_list *, int, int, int);
static int ocvt_n(FILE *, va_list *, int, int, int);
static int ocvt_o(FILE *, va_list *, int, int, int);
static int ocvt_p(FILE *, va_list *, int, int, int);
static int ocvt_s(FILE *, va_list *, int, int, int);
static int ocvt_u(FILE *, va_list *, int, int, int);
static int ocvt_x(FILE *, va_list *, int, int, int);
static int(*ocvt[])(FILE *, va_list *, int, int, int) = {
0, 0, 0, 0, 0, 0, 0, 0, /* ^@ ^A ^B ^C ^D ^E ^F ^G */
0, 0, 0, 0, 0, 0, 0, 0, /* ^H ^I ^J ^K ^L ^M ^N ^O */
0, 0, 0, 0, 0, 0, 0, 0, /* ^P ^Q ^R ^S ^T ^U ^V ^W */
0, 0, 0, 0, 0, 0, 0, 0, /* ^X ^Y ^Z ^[ ^\ ^] ^^ ^_ */
0, 0, 0, 0, 0, 0, 0, 0, /* sp ! " # $ % & ' */
0, 0, 0, 0, 0, 0, 0, 0, /* ( ) * + , - . / */
0, 0, 0, 0, 0, 0, 0, 0, /* 0 1 2 3 4 5 6 7 */
0, 0, 0, 0, 0, 0, 0, 0, /* 8 9 : ; < = > ? */
0, 0, 0, 0, 0, ocvt_E, 0, ocvt_G, /* @ A B C D E F G */
0, 0, 0, 0, 0, 0, 0, 0, /* H I J K L M N O */
0, 0, 0, 0, 0, 0, 0, 0, /* P Q R S T U V W */
ocvt_X, 0, 0, 0, 0, 0, 0, 0, /* X Y Z [ \ ] ^ _ */
0, 0, 0, ocvt_c, ocvt_d, ocvt_e, ocvt_f, ocvt_g, /* ` a b c d e f g */
0, ocvt_d, 0, 0, 0, 0, ocvt_n, ocvt_o, /* h i j k l m n o */
ocvt_p, 0, 0, ocvt_s, 0, ocvt_u, 0, 0, /* p q r s t u v w */
ocvt_x, 0, 0, 0, 0, 0, 0, 0, /* x y z { | } ~ ^? */
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
};
static int nprint;
QLock _stdiolk;
int
vfprintf(FILE *f, const char *s, va_list args)
{
int flags, width, precision;
qlock(&_stdiolk);
nprint = 0;
while(*s){
if(*s != '%'){
putc(*s++, f);
nprint++;
continue;
}
s++;
flags = 0;
while(lflag[*s&_IO_CHMASK]) flags |= lflag[*s++&_IO_CHMASK];
if(*s == '*'){
width = va_arg(args, int);
s++;
if(width<0){
flags |= LEFT;
width = -width;
}
}
else{
width = 0;
while('0'<=*s && *s<='9') width = width*10 + *s++ - '0';
}
if(*s == '.'){
s++;
if(*s == '*'){
precision = va_arg(args, int);
s++;
}
else{
precision = 0;
while('0'<=*s && *s<='9') precision = precision*10 + *s++ - '0';
}
}
else
precision = -1;
while(tflag[*s&_IO_CHMASK]) flags |= tflag[*s++&_IO_CHMASK];
if(ocvt[*s]) nprint += (*ocvt[*s++])(f, &args, flags, width, precision);
else if(*s){
putc(*s++, f);
nprint++;
}
}
qunlock(&_stdiolk);
if(ferror(f)){
if((f->flags&STRING) && f->wp==f->rp && f->wp>f->buf){
*(f->wp-1) = '\0';
return nprint;
}
return -1;
}
return nprint;
}
static int
ocvt_c(FILE *f, va_list *args, int flags, int width, int precision)
{
#pragma ref precision
int i;
if(!(flags&LEFT)) for(i=1; i<width; i++) putc(' ', f);
putc((unsigned char)va_arg(*args, int), f);
if(flags&LEFT) for(i=1; i<width; i++) putc(' ', f);
return width<1 ? 1 : width;
}
static int
ocvt_s(FILE *f, va_list *args, int flags, int width, int precision)
{
int i, n = 0;
char *s;
s = va_arg(*args, char *);
if(!(flags&LEFT)){
if(precision >= 0)
for(i=0; i!=precision && s[i]; i++);
else
for(i=0; s[i]; i++);
for(; i<width; i++){
putc(' ', f);
n++;
}
}
if(precision >= 0){
for(i=0; i!=precision && *s; i++){
putc(*s++, f);
n++;
}
} else{
for(i=0;*s;i++){
putc(*s++, f);
n++;
}
}
if(flags&LEFT){
for(; i<width; i++){
putc(' ', f);
n++;
}
}
return n;
}
static int
ocvt_n(FILE *f, va_list *args, int flags, int width, int precision)
{
#pragma ref f
#pragma ref width
#pragma ref precision
if(flags&SHORT)
*va_arg(*args, short *) = nprint;
else if(flags&LONG)
*va_arg(*args, long *) = nprint;
else
*va_arg(*args, int *) = nprint;
return 0;
}
/*
* Generic fixed-point conversion
* f is the output FILE *;
* args is the va_list * from which to get the number;
* flags, width and precision are the results of printf-cracking;
* radix is the number base to print in;
* alphabet is the set of digits to use;
* prefix is the prefix to print before non-zero numbers when
* using ``alternate form.''
*/
static int
ocvt_fixed(FILE *f, va_list *args, int flags, int width, int precision,
int radix, int sgned, char alphabet[], char *prefix)
{
char digits[128]; /* no reasonable machine will ever overflow this */
char *sign;
char *dp;
long snum;
unsigned long num;
int nout, npad, nlzero;
if(sgned){
if(flags&PTR) snum = (long)va_arg(*args, void *);
else if(flags&SHORT) snum = va_arg(*args, short);
else if(flags&LONG) snum = va_arg(*args, long);
else snum = va_arg(*args, int);
if(snum < 0){
sign = "-";
num = -snum;
} else{
if(flags&SIGN) sign = "+";
else if(flags&SPACE) sign = " ";
else sign = "";
num = snum;
}
} else {
sign = "";
if(flags&PTR) num = (long)va_arg(*args, void *);
else if(flags&SHORT) num = va_arg(*args, unsigned short);
else if(flags&LONG) num = va_arg(*args, unsigned long);
else num = va_arg(*args, unsigned int);
}
if(num == 0) prefix = "";
dp = digits;
do{
*dp++ = alphabet[num%radix];
num /= radix;
}while(num);
if(precision==0 && dp-digits==1 && dp[-1]=='0')
dp--;
nlzero = precision-(dp-digits);
if(nlzero < 0) nlzero = 0;
if(flags&ALT){
if(radix == 8) if(dp[-1]=='0' || nlzero) prefix = "";
}
else prefix = "";
nout = dp-digits+nlzero+strlen(prefix)+strlen(sign);
npad = width-nout;
if(npad < 0) npad = 0;
nout += npad;
if(!(flags&LEFT)){
if(flags&ZPAD && precision <= 0){
fputs(sign, f);
fputs(prefix, f);
while(npad){
putc('0', f);
--npad;
}
} else{
while(npad){
putc(' ', f);
--npad;
}
fputs(sign, f);
fputs(prefix, f);
}
while(nlzero){
putc('0', f);
--nlzero;
}
while(dp!=digits) putc(*--dp, f);
}
else{
fputs(sign, f);
fputs(prefix, f);
while(nlzero){
putc('0', f);
--nlzero;
}
while(dp != digits) putc(*--dp, f);
while(npad){
putc(' ', f);
--npad;
}
}
return nout;
}
static int
ocvt_X(FILE *f, va_list *args, int flags, int width, int precision)
{
return ocvt_fixed(f, args, flags, width, precision, 16, 0, "0123456789ABCDEF", "0X");
}
static int
ocvt_d(FILE *f, va_list *args, int flags, int width, int precision)
{
return ocvt_fixed(f, args, flags, width, precision, 10, 1, "0123456789", "");
}
static int
ocvt_o(FILE *f, va_list *args, int flags, int width, int precision)
{
return ocvt_fixed(f, args, flags, width, precision, 8, 0, "01234567", "0");
}
static int
ocvt_p(FILE *f, va_list *args, int flags, int width, int precision)
{
return ocvt_fixed(f, args, flags|PTR|ALT, width, precision, 16, 0,
"0123456789ABCDEF", "0X");
}
static int
ocvt_u(FILE *f, va_list *args, int flags, int width, int precision)
{
return ocvt_fixed(f, args, flags, width, precision, 10, 0, "0123456789", "");
}
static int
ocvt_x(FILE *f, va_list *args, int flags, int width, int precision)
{
return ocvt_fixed(f, args, flags, width, precision, 16, 0, "0123456789abcdef", "0x");
}
static int ocvt_flt(FILE *, va_list *, int, int, int, char);
static int
ocvt_E(FILE *f, va_list *args, int flags, int width, int precision)
{
return ocvt_flt(f, args, flags, width, precision, 'E');
}
static int
ocvt_G(FILE *f, va_list *args, int flags, int width, int precision)
{
return ocvt_flt(f, args, flags, width, precision, 'G');
}
static int
ocvt_e(FILE *f, va_list *args, int flags, int width, int precision)
{
return ocvt_flt(f, args, flags, width, precision, 'e');
}
static int
ocvt_f(FILE *f, va_list *args, int flags, int width, int precision)
{
return ocvt_flt(f, args, flags, width, precision, 'f');
}
static int
ocvt_g(FILE *f, va_list *args, int flags, int width, int precision)
{
return ocvt_flt(f, args, flags, width, precision, 'g');
}
static int
ocvt_flt(FILE *f, va_list *args, int flags, int width, int precision, char afmt)
{
int echr;
char *digits, *edigits;
int exponent;
char fmt;
int sign;
int ndig;
int nout, i;
char ebuf[20]; /* no sensible machine will overflow this */
char *eptr;
double d;
echr = 'e';
fmt = afmt;
d = va_arg(*args, double);
if(precision < 0) precision = 6;
switch(fmt){
case 'f':
digits = dtoa(d, 3, precision, &exponent, &sign, &edigits);
break;
case 'E':
echr = 'E';
fmt = 'e';
/* fall through */
case 'e':
digits = dtoa(d, 2, 1+precision, &exponent, &sign, &edigits);
break;
case 'G':
echr = 'E';
/* fall through */
case 'g':
if (precision > 0)
digits = dtoa(d, 2, precision, &exponent, &sign, &edigits);
else {
digits = dtoa(d, 0, precision, &exponent, &sign, &edigits);
precision = edigits - digits;
if (exponent > precision && exponent <= precision + 4)
precision = exponent;
}
if(exponent >= -3 && exponent <= precision){
fmt = 'f';
precision -= exponent;
}else{
fmt = 'e';
--precision;
}
break;
}
if (exponent == 9999) {
/* Infinity or Nan */
precision = 0;
exponent = edigits - digits;
fmt = 'f';
}
ndig = edigits-digits;
if((afmt=='g' || afmt=='G') && !(flags&ALT)){ /* knock off trailing zeros */
if(fmt == 'f'){
if(precision+exponent > ndig) {
precision = ndig - exponent;
if(precision < 0)
precision = 0;
}
}
else{
if(precision > ndig-1) precision = ndig-1;
}
}
nout = precision; /* digits after decimal point */
if(precision!=0 || flags&ALT) nout++; /* decimal point */
if(fmt=='f' && exponent>0) nout += exponent; /* digits before decimal point */
else nout++; /* there's always at least one */
if(sign || flags&(SPACE|SIGN)) nout++; /* sign */
if(fmt != 'f'){ /* exponent */
eptr = ebuf;
for(i=exponent<=0?1-exponent:exponent-1; i; i/=10)
*eptr++ = '0' + i%10;
while(eptr<ebuf+2) *eptr++ = '0';
nout += eptr-ebuf+2; /* e+99 */
}
if(!(flags&ZPAD) && !(flags&LEFT))
while(nout < width){
putc(' ', f);
nout++;
}
if(sign) putc('-', f);
else if(flags&SIGN) putc('+', f);
else if(flags&SPACE) putc(' ', f);
if(flags&ZPAD)
while(nout < width){
putc('0', f);
nout++;
}
if(fmt == 'f'){
for(i=0; i<exponent; i++) putc(i<ndig?digits[i]:'0', f);
if(i == 0) putc('0', f);
if(precision>0 || flags&ALT) putc('.', f);
for(i=0; i!=precision; i++)
putc(0<=i+exponent && i+exponent<ndig?digits[i+exponent]:'0', f);
}
else{
putc(digits[0], f);
if(precision>0 || flags&ALT) putc('.', f);
for(i=0; i!=precision; i++) putc(i<ndig-1?digits[i+1]:'0', f);
}
if(fmt != 'f'){
putc(echr, f);
putc(exponent<=0?'-':'+', f);
while(eptr>ebuf) putc(*--eptr, f);
}
while(nout < width){
putc(' ', f);
nout++;
}
freedtoa(digits);
return nout;
}