void
BetterStream::_vprintf (unsigned char in_progmem, const char *fmt, va_list ap)
{
unsigned char c; /* holds a char from the format string */
unsigned char flags;
unsigned char width;
unsigned char prec;
unsigned char buf[11]; /* size for -1 in octal, without '\0' */
for (;;) {
/*
* Process non-format characters
*/
for (;;) {
c = GETBYTE (in_progmem, 1, fmt);
if (!c) return;
if (c == '%') {
c = GETBYTE (in_progmem, 1, fmt);
if (c != '%') break;
}
/* emit cr before lf to make most terminals happy */
if (c == '\n')
write('\r');
write(c);
}
flags = 0;
width = 0;
prec = 0;
/*
* Process format adjustment characters, precision, width.
*/
do {
if (flags < FL_WIDTH) {
switch (c) {
case '0':
flags |= FL_ZFILL;
continue;
case '+':
flags |= FL_PLUS;
/* FALLTHROUGH */
case ' ':
flags |= FL_SPACE;
continue;
case '-':
flags |= FL_LPAD;
continue;
case '#':
flags |= FL_ALT;
continue;
}
}
if (flags < FL_LONG) {
if (c >= '0' && c <= '9') {
c -= '0';
if (flags & FL_PREC) {
prec = 10*prec + c;
continue;
}
width = 10*width + c;
flags |= FL_WIDTH;
continue;
}
if (c == '.') {
if (flags & FL_PREC)
return;
flags |= FL_PREC;
continue;
}
if (c == 'l') {
flags |= FL_LONG;
continue;
}
if (c == 'h')
continue;
}
break;
} while ( (c = GETBYTE (in_progmem, 1, fmt)) != 0);
/*
* Handle floating-point formats E, F, G, e, f, g.
*/
if (c >= 'E' && c <= 'G') {
flags |= FL_FLTUPP;
c += 'e' - 'E';
goto flt_oper;
} else if (c >= 'e' && c <= 'g') {
int exp; /* exponent of master decimal digit */
int n;
unsigned char vtype; /* result of float value parse */
unsigned char sign; /* sign character (or 0) */
unsigned char ndigs;
flags &= ~FL_FLTUPP;
flt_oper:
if (!(flags & FL_PREC))
prec = 6;
flags &= ~(FL_FLTEXP | FL_FLTFIX);
if (c == 'e')
flags |= FL_FLTEXP;
else if (c == 'f')
flags |= FL_FLTFIX;
else if (prec > 0)
prec -= 1;
if (flags & FL_FLTFIX) {
vtype = 7; /* 'prec' arg for 'ftoa_engine' */
ndigs = prec < 60 ? prec + 1 : 60;
} else {
if (prec > 7) prec = 7;
vtype = prec;
ndigs = 0;
}
exp = __ftoa_engine (va_arg(ap,double), (char *)buf, vtype, ndigs);
vtype = buf[0];
sign = 0;
if ((vtype & FTOA_MINUS) && !(vtype & FTOA_NAN))
sign = '-';
else if (flags & FL_PLUS)
sign = '+';
else if (flags & FL_SPACE)
sign = ' ';
if (vtype & (FTOA_NAN | FTOA_INF)) {
const char *p;
ndigs = sign ? 4 : 3;
if (width > ndigs) {
width -= ndigs;
if (!(flags & FL_LPAD)) {
do {
write(' ');
} while (--width);
}
} else {
width = 0;
}
if (sign)
write(sign);
p = PSTR("inf");
if (vtype & FTOA_NAN)
p = PSTR("nan");
while ( (ndigs = pgm_read_byte((const prog_char *)p)) != 0) {
if (flags & FL_FLTUPP)
ndigs += 'I' - 'i';
write(ndigs);
p++;
}
goto tail;
}
/* Output format adjustment, number of decimal digits in buf[] */
if (flags & FL_FLTFIX) {
ndigs += exp;
if ((vtype & FTOA_CARRY) && buf[1] == '1')
ndigs -= 1;
if ((signed char)ndigs < 1)
ndigs = 1;
else if (ndigs > 8)
ndigs = 8;
} else if (!(flags & FL_FLTEXP)) { /* 'g(G)' format */
if (exp <= prec && exp >= -4)
flags |= FL_FLTFIX;
while (prec && buf[1+prec] == '0')
prec--;
if (flags & FL_FLTFIX) {
ndigs = prec + 1; /* number of digits in buf */
prec = prec > exp
? prec - exp : 0; /* fractional part length */
}
}
/* Conversion result length, width := free space length */
if (flags & FL_FLTFIX)
n = (exp>0 ? exp+1 : 1);
else
n = 5; /* 1e+00 */
if (sign) n += 1;
if (prec) n += prec + 1;
width = width > n ? width - n : 0;
/* Output before first digit */
if (!(flags & (FL_LPAD | FL_ZFILL))) {
while (width) {
write(' ');
width--;
}
}
if (sign) write(sign);
if (!(flags & FL_LPAD)) {
while (width) {
write('0');
width--;
}
}
if (flags & FL_FLTFIX) { /* 'f' format */
n = exp > 0 ? exp : 0; /* exponent of left digit */
do {
if (n == -1)
write('.');
flags = (n <= exp && n > exp - ndigs)
? buf[exp - n + 1] : '0';
if (--n < -prec)
break;
write(flags);
} while (1);
if (n == exp
&& (buf[1] > '5'
|| (buf[1] == '5' && !(vtype & FTOA_CARRY))) )
{
flags = '1';
}
write(flags);
} else { /* 'e(E)' format */
/* mantissa */
if (buf[1] != '1')
vtype &= ~FTOA_CARRY;
write(buf[1]);
if (prec) {
write('.');
sign = 2;
do {
write(buf[sign++]);
} while (--prec);
}
/* exponent */
write(flags & FL_FLTUPP ? 'E' : 'e');
ndigs = '+';
if (exp < 0 || (exp == 0 && (vtype & FTOA_CARRY) != 0)) {
exp = -exp;
ndigs = '-';
}
write(ndigs);
for (ndigs = '0'; exp >= 10; exp -= 10)
ndigs += 1;
write(ndigs);
write('0' + exp);
}
goto tail;
}
/*
* Handle string formats c, s, S.
*/
{
const char * pnt;
size_t size;
switch (c) {
case 'c':
buf[0] = va_arg (ap, int);
pnt = (char *)buf;
size = 1;
goto no_pgmstring;
case 's':
pnt = va_arg (ap, char *);
size = strnlen (pnt, (flags & FL_PREC) ? prec : ~0);
no_pgmstring:
flags &= ~FL_PGMSTRING;
goto str_lpad;
case 'S':
// pgmstring: // not yet used
pnt = va_arg (ap, char *);
size = strnlen_P (pnt, (flags & FL_PREC) ? prec : ~0);
flags |= FL_PGMSTRING;
str_lpad:
if (!(flags & FL_LPAD)) {
while (size < width) {
write(' ');
width--;
}
}
while (size) {
write(GETBYTE (flags, FL_PGMSTRING, pnt));
if (width) width -= 1;
size -= 1;
}
goto tail;
}
}
/*
* Handle integer formats variations for d/i, u, o, p, x, X.
*/
if (c == 'd' || c == 'i') {
long x = (flags & FL_LONG) ? va_arg(ap,long) : va_arg(ap,int);
flags &= ~(FL_NEGATIVE | FL_ALT);
if (x < 0) {
x = -x;
flags |= FL_NEGATIVE;
}
c = __ultoa_invert (x, (char *)buf, 10) - (char *)buf;
} else {
int
vfprintf (FILE * stream, const char *fmt, va_list ap)
{
unsigned char c; /* holds a char from the format string */
unsigned char flags;
unsigned char buf[11]; /* size for -1 in octal, without '\0' */
stream->len = 0;
if ((stream->flags & __SWR) == 0)
return EOF;
for (;;) {
for (;;) {
c = *fmt++;
if (!c) goto ret;
if (c == '%') {
c = *fmt++;
if (c != '%') break;
}
putc (c, stream);
}
for (flags = 0;
!(flags & FL_LONG); /* 'll' will detect as error */
c = *fmt++)
{
if (c && strchr(" +-.0123456789h", c))
continue;
if (c == '#') {
flags |= FL_ALT;
continue;
}
if (c == 'l') {
flags |= FL_LONG;
continue;
}
break;
}
/* Only a format character is valid. */
if (c && strchr("EFGefg", c)) {
(void) va_arg (ap, double);
putc ('?', stream);
continue;
}
{
const char * pnt;
switch (c) {
case 'c':
putc (va_arg (ap, int), stream);
continue;
case 'S':
/* FALLTHROUGH */
case 's':
pnt = va_arg (ap, char *);
while ( (c = *pnt++) != 0)
putc (c, stream);
continue;
}
}
if (c == 'd' || c == 'i') {
long x = (flags & FL_LONG) ? va_arg(ap,long) : va_arg(ap,int);
flags &= ~FL_ALT;
if (x < 0) {
x = -x;
/* `putc ('-', stream)' will considarably inlarge stack size.
So flag is used. */
flags |= FL_NEGATIVE;
}
c = __ultoa_invert (x, (char *)buf, 10) - (char *)buf;
} else {
