/* public helper routine: fmt out a null terminated string already in hand */
int
fmtstrcpy(Fmt *f, char *s)
{
int i, j;
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){
#ifdef PLAN9PORT
Rune r;
i = 0;
for(j=0; j<f->prec && s[i]; j++)
i += chartorune(&r, s+i);
#else
/* ANSI requires precision in bytes, not Runes */
for(i=0; i<f->prec; i++)
if(s[i] == 0)
break;
j = utfnlen(s, i); /* won't print partial at end */
#endif
return __fmtcpy(f, s, j, i);
}
return __fmtcpy(f, s, utflen(s), strlen(s));
}
/* public helper routine: fmt out a null terminated string already in hand */
int
fmtstrcpy(Fmt *f, char *s)
{
int i, j;
Rune r;
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){
i = 0;
for(j=0; j<f->prec && s[i]; j++)
i += chartorune(&r, s+i);
return __fmtcpy(f, s, j, i);
}
return __fmtcpy(f, s, utflen(s), strlen(s));
}
int
__errfmt(Fmt *f)
{
char buf[ERRMAX];
rerrstr(buf, sizeof buf);
return __fmtcpy(f, buf, utflen(buf), strlen(buf));
}
/* 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 one character */
int
__charfmt(Fmt *f)
{
char x[1];
x[0] = va_arg(f->args, int);
f->prec = 1;
return __fmtcpy(f, (const char*)x, 1, 1);
}
static int
floatfmt(Fmt *fmt, double f)
{
char s[341]; /* precision+exponent+sign+'.'+null */
xdtoa(fmt, s, f);
fmt->flags &= FmtWidth|FmtLeft;
__fmtcpy(fmt, s, strlen(s), strlen(s));
return 0;
}
/* 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);
}
int
__efgfmt(Fmt *fmt)
{
double f;
char s1[NSIGNIF+10];
int e, d, n;
int c1, c2, c3, c4, ucase, sign, chr, prec, fl;
f = va_arg(fmt->args, double);
prec = FDEFLT;
fl = fmt->flags;
fmt->flags = 0;
if(fl & FmtPrec)
prec = fmt->prec;
chr = fmt->r;
ucase = 0;
if(chr == 'E'){
chr = 'e';
ucase = 1;
}else if(chr == 'F'){
chr = 'f';
ucase = 1;
}else if(chr == 'G'){
chr = 'g';
ucase = 1;
}
if(prec > 0 && chr == 'g')
prec--;
if(prec < 0)
prec = 0;
xdodtoa(s1, f, chr, prec, &e, &sign);
e--;
if(*s1 == 'i' || *s1 == 'n'){
if(ucase){
if(*s1 == 'i'){
strcpy(s1, "INF");
}else{
strcpy(s1, "NAN");
}
}
fmt->flags = fl & (FmtWidth|FmtLeft);
return __fmtcpy(fmt, (const void*)s1, 3, 3);
}
/*
* copy into final place
* c1 digits of leading '0'
* c2 digits from conversion
* c3 digits of trailing '0'
* c4 digits after '.'
*/
c1 = 0;
c2 = prec + 1;
c3 = 0;
c4 = prec;
switch(chr) {
default:
chr = 'e';
break;
case 'g':
/*
* decide on 'e' of 'f' style convers
*/
if(e >= -4 && e <= prec) {
c1 = -e;
c4 = prec - e;
chr = 'h'; /* flag for 'f' style */
}
break;
case 'f':
c1 = -e;
if(c1 > prec)
c1 = prec + 1;
c2 += e;
break;
}
/*
* clean up c1 c2 and c3
*/
if(c1 < 0)
c1 = 0;
if(c2 < 0)
c2 = 0;
if(c2 > NSIGNIF) {
c3 = c2-NSIGNIF;
c2 = NSIGNIF;
}
/*
* trim trailing zeros for %g
*/
if(!(fl & FmtSharp)
&& (chr == 'g' || chr == 'h')){
if(c4 >= c3){
c4 -= c3;
c3 = 0;
}else{
c3 -= c4;
c4 = 0;
}
while(c4 && c2 > 1 && s1[c2 - 1] == '0'){
c4--;
c2--;
}
}
/*
* calculate the total length
*/
n = c1 + c2 + c3;
if(sign || (fl & (FmtSign|FmtSpace)))
n++;
if(c4 || (fl & FmtSharp)){
n++;
}
if(chr == 'e' || chr == 'g'){
n += 4;
if(e >= 100)
n++;
}
/*
* pad to width if right justified
*/
if((fl & (FmtWidth|FmtLeft)) == FmtWidth && n < fmt->width){
if(fl & FmtZero){
c1 += fmt->width - n;
}else{
if(__fmtpad(fmt, fmt->width - n) < 0){
return -1;
}
}
}
/*
* sign
*/
d = 0;
if(sign)
d = '-';
else if(fl & FmtSign)
d = '+';
else if(fl & FmtSpace)
d = ' ';
if(d && fmtrune(fmt, d) < 0){
return -1;
}
/*
* copy digits
*/
c4 = c1 + c2 + c3 - c4;
if(c1 > 0){
if(fmtzdotpad(fmt, c1, c4) < 0){
return -1;
}
c4 -= c1;
}
d = 0;
if(c4 >= 0 && c4 < c2){
if(__fmtcpy(fmt, s1, c4, c4) < 0 || fmtrune(fmt, '.') < 0)
return -1;
d = c4;
c2 -= c4;
c4 = -1;
}
if(__fmtcpy(fmt, (const void*)(s1 + d), c2, c2) < 0){
return -1;
}
c4 -= c2;
if(c3 > 0){
if(fmtzdotpad(fmt, c3, c4) < 0){
return -1;
}
c4 -= c3;
}
/*
* strip trailing '0' on g conv
*/
if((fl & FmtSharp) && c4 == 0 && fmtrune(fmt, '.') < 0){
return -1;
}
if(chr == 'e' || chr == 'g') {
d = 0;
if(ucase)
s1[d++] = 'E';
else
s1[d++] = 'e';
c1 = e;
if(c1 < 0) {
s1[d++] = '-';
c1 = -c1;
} else
s1[d++] = '+';
if(c1 >= 100) {
s1[d++] = c1/100 + '0';
c1 = c1%100;
}
s1[d++] = c1/10 + '0';
s1[d++] = c1%10 + '0';
if(__fmtcpy(fmt, s1, d, d) < 0){
return -1;
}
}
if((fl & (FmtWidth|FmtLeft)) == (FmtWidth|FmtLeft) && n < fmt->width){
if(__fmtpad(fmt, fmt->width - n) < 0){
return -1;
}
}
return 0;
}