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lib_libvsprintf.c
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lib_libvsprintf.c
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/****************************************************************************
* libs/libc/stdio/lib_libvsprintf.c
*
* Copyright (c) 2002, Alexander Popov (sasho@vip.bg)
* Copyright (c) 2002,2004,2005 Joerg Wunsch
* Copyright (c) 2005, Helmut Wallner
* Copyright (c) 2007, Dmitry Xmelkov
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <nuttx/compiler.h>
#include <nuttx/streams.h>
#include <nuttx/allsyms.h>
#include <nuttx/symtab.h>
#include "lib_dtoa_engine.h"
#include "lib_ultoa_invert.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* CONFIG_LIBC_LONG_LONG is not a valid selection of the compiler does not
* support long long types.
*/
#ifndef CONFIG_HAVE_LONG_LONG
# undef CONFIG_LIBC_LONG_LONG
#endif
#define stream_putc(c,stream) (total_len++, lib_stream_putc(stream, c))
#define stream_puts(buf, len, stream) \
(total_len += len, lib_stream_puts(stream, buf, len))
/* Order is relevant here and matches order in format string */
#define FL_ZFILL 0x0001
#define FL_PLUS 0x0002
#define FL_SPACE 0x0004
#define FL_LPAD 0x0008
#define FL_ALT 0x0010
#define FL_ARGNUMBER 0x0020
#define FL_ASTERISK 0x0040
#define FL_WIDTH 0x0080
#define FL_PREC 0x0100
#define FL_LONG 0x0200
#define FL_SHORT 0x0400
#define FL_REPD_TYPE 0x0800
#define FL_NEGATIVE 0x1000
/* The next 2 groups are Exclusive Or */
#define FL_ALTUPP 0x2000
#define FL_ALTHEX 0x4000
#define FL_FLTUPP 0x2000
#define FL_FLTEXP 0x4000
#define FL_FLTFIX 0x8000
#define TYPE_INT 1
#define TYPE_LONG 2
#define TYPE_LONG_LONG 3
#define TYPE_DOUBLE 4
#define TYPE_CHAR_POINTER 5
/* Support special access to CODE-space strings for Harvard architectures */
#ifdef CONFIG_ARCH_ROMGETC
# define fmt_char(fmt) up_romgetc((fmt)++)
#else
# define fmt_char(fmt) (*(fmt)++)
#endif
#define fmt_ungetc(fmt) ((fmt)--)
/****************************************************************************
* Private Types
****************************************************************************/
struct arg_s
{
unsigned char type;
union
{
unsigned int u;
unsigned long ul;
#ifdef CONFIG_HAVE_LONG_LONG
unsigned long long ull;
#endif
#ifdef CONFIG_HAVE_DOUBLE
double d;
#endif
FAR char *cp;
} value;
};
/****************************************************************************
* Private Constant Data
****************************************************************************/
static const char g_nullstring[] = "(null)";
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int vsprintf_internal(FAR struct lib_outstream_s *stream,
FAR struct arg_s *arglist, int numargs,
FAR const IPTR char *fmt, va_list ap)
printf_like(4, 0);
/****************************************************************************
* Private Functions
****************************************************************************/
static int vsprintf_internal(FAR struct lib_outstream_s *stream,
FAR struct arg_s *arglist, int numargs,
FAR const IPTR char *fmt, va_list ap)
{
unsigned char c; /* Holds a char from the format string */
uint16_t flags;
int width;
int prec;
union
{
#if defined (CONFIG_LIBC_LONG_LONG) || (ULONG_MAX > 4294967295UL)
char __buf[22]; /* Size for -1 in octal, without '\0' */
#else
char __buf[11]; /* Size for -1 in octal, without '\0' */
#endif
#ifdef CONFIG_LIBC_FLOATINGPOINT
struct dtoa_s __dtoa;
#endif
} u;
#define buf (u.__buf)
#define _dtoa (u.__dtoa)
FAR const char *pnt;
size_t size;
unsigned char len;
int total_len = 0;
#ifdef CONFIG_LIBC_NUMBERED_ARGS
int argnumber = 0;
#endif
for (; ; )
{
for (; ; )
{
c = fmt_char(fmt);
if (c == '\0')
{
goto ret;
}
if (c == '%')
{
c = fmt_char(fmt);
if (c != '%')
{
break;
}
}
#ifdef CONFIG_LIBC_NUMBERED_ARGS
if (stream != NULL)
{
stream_putc(c, stream);
}
#else
stream_putc(c, stream);
#endif
}
flags = 0;
width = 0;
prec = 0;
do
{
if (flags < FL_ASTERISK)
{
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)
{
#ifdef CONFIG_LIBC_NUMBERED_ARGS
if (c == '$')
{
if ((flags & FL_ARGNUMBER) == 0)
{
/* No other flag except FL_WIDTH or FL_ZFILL (leading
* zeros) and argument number must be at least 1
*/
if ((flags & ~(FL_WIDTH | FL_ZFILL)) != 0 ||
width == 0)
{
goto ret;
}
/* It had been the argument number. */
argnumber = width;
width = 0;
flags = FL_ARGNUMBER;
}
else if ((flags & FL_ASTERISK) != 0)
{
int index;
flags &= ~FL_ASTERISK;
if ((flags & FL_PREC) == 0)
{
index = width;
}
else
{
index = prec;
}
if (index > 0 && index <= numargs)
{
if (stream == NULL)
{
arglist[index - 1].type = TYPE_INT;
if (index > total_len)
{
total_len = index;
}
}
else
{
if ((flags & FL_PREC) == 0)
{
width = (int)arglist[index - 1].value.u;
}
else
{
prec = (int)arglist[index - 1].value.u;
}
}
}
else
{
goto ret;
}
}
else
{
goto ret;
}
continue;
}
#endif
if (c >= '0' && c <= '9')
{
c -= '0';
if ((flags & FL_PREC) != 0)
{
prec = 10 * prec + c;
continue;
}
width = 10 * width + c;
flags |= FL_WIDTH;
continue;
}
if (c == '*')
{
#ifdef CONFIG_LIBC_NUMBERED_ARGS
if ((flags & FL_ARGNUMBER) != 0)
{
flags |= FL_ASTERISK;
continue;
}
else if (stream == NULL)
{
continue; /* We do only parsing */
}
#endif
if ((flags & FL_PREC) != 0)
{
prec = va_arg(ap, int);
if (prec < 0)
{
prec = 0;
}
}
else
{
width = va_arg(ap, int);
flags |= FL_WIDTH;
if (width < 0)
{
width = -width;
flags |= FL_LPAD;
}
}
continue;
}
if (c == '.')
{
if ((flags & FL_PREC) != 0)
{
goto ret;
}
flags |= FL_PREC;
continue;
}
}
/* Note: On NuttX, ptrdiff_t == intptr_t == ssize_t. */
if (c == 'z' || c == 't')
{
if (sizeof(size_t) == sizeof(unsigned short))
{
c = 'h';
}
else if (sizeof(size_t) == sizeof(unsigned long))
{
c = 'l';
}
#if defined(CONFIG_HAVE_LONG_LONG) && ULLONG_MAX != ULONG_MAX
else if (sizeof(size_t) == sizeof(unsigned long long))
{
c = 'l';
flags |= FL_LONG;
flags &= ~FL_SHORT;
}
#endif
else
{
/* The only known cases that the default will be hit are
* (1) the eZ80 which has sizeof(size_t) = 3 which is the
* same as the sizeof(int). And (2) if
* CONFIG_HAVE_LONG_LONG
* is not enabled and sizeof(size_t) is equal to
* sizeof(unsigned long long). This latter case is an
* error.
* Treat as integer with no size qualifier.
*/
continue;
}
}
if (c == 'j')
{
/* Same as long long if available. Otherwise, long. */
#ifdef CONFIG_HAVE_LONG_LONG
flags |= FL_REPD_TYPE;
#endif
flags |= FL_LONG;
flags &= ~FL_SHORT;
continue;
}
if (c == 'l')
{
if ((flags & FL_LONG) != 0)
{
flags |= FL_REPD_TYPE;
}
else
{
flags |= FL_LONG;
}
flags &= ~FL_SHORT;
continue;
}
if (c == 'h')
{
if ((flags & FL_SHORT) != 0)
{
flags |= FL_REPD_TYPE;
}
else
{
flags |= FL_SHORT;
}
flags &= ~FL_LONG;
continue;
}
break;
}
while ((c = fmt_char(fmt)) != 0);
/* Only a format character is valid. */
#if 'F' != 'E'+1 || 'G' != 'F'+1 || 'f' != 'e'+1 || 'g' != 'f'+1
# error
#endif
if (c == 'p')
{
/* Determine size of pointer and set flags accordingly */
flags &= ~(FL_LONG | FL_REPD_TYPE);
#ifdef CONFIG_HAVE_LONG_LONG
if (sizeof(FAR void *) == sizeof(unsigned long long))
{
flags |= (FL_LONG | FL_REPD_TYPE);
}
else
#endif
if (sizeof(FAR void *) == sizeof(unsigned long))
{
flags |= FL_LONG;
}
}
#ifdef CONFIG_LIBC_NUMBERED_ARGS
if ((flags & FL_ARGNUMBER) != 0)
{
if (argnumber > 0 && argnumber <= numargs)
{
if (stream == NULL)
{
if ((c >= 'E' && c <= 'G')
|| (c >= 'e' && c <= 'g'))
{
arglist[argnumber - 1].type = TYPE_DOUBLE;
}
else if (c == 'i' || c == 'd' || c == 'u' || c == 'p')
{
if ((flags & FL_LONG) == 0)
{
arglist[argnumber - 1].type = TYPE_INT;
}
else if ((flags & FL_REPD_TYPE) == 0)
{
arglist[argnumber - 1].type = TYPE_LONG;
}
else
{
arglist[argnumber - 1].type = TYPE_LONG_LONG;
}
}
else if (c == 'c')
{
arglist[argnumber - 1].type = TYPE_INT;
}
else if (c == 's')
{
arglist[argnumber - 1].type = TYPE_CHAR_POINTER;
}
if (argnumber > total_len)
{
total_len = argnumber;
}
continue; /* We do only parsing */
}
}
else
{
goto ret;
}
}
else if (stream == NULL)
{
continue; /* We do only parsing */
}
#endif
#ifdef CONFIG_LIBC_FLOATINGPOINT
if (c >= 'E' && c <= 'G')
{
flags |= FL_FLTUPP;
c += 'e' - 'E';
goto flt_oper;
}
else if (c >= 'e' && c <= 'g')
{
double value;
int exp; /* Exponent of master decimal digit */
int n;
uint8_t sign; /* Sign character (or 0) */
uint8_t ndigs; /* Number of digits to convert */
uint8_t ndecimal; /* Digits after decimal (for 'f' format), 0 if
* no limit */
flags &= ~FL_FLTUPP;
flt_oper:
ndigs = 0;
if ((flags & FL_PREC) == 0)
{
prec = 6;
}
flags &= ~(FL_FLTEXP | FL_FLTFIX);
if (c == 'e')
{
ndigs = prec + 1;
ndecimal = 0;
flags |= FL_FLTEXP;
}
else if (c == 'f')
{
ndigs = DTOA_MAX_DIG;
ndecimal = prec;
flags |= FL_FLTFIX;
}
else
{
ndigs = prec;
ndecimal = 0;
}
if (ndigs > DTOA_MAX_DIG)
{
ndigs = DTOA_MAX_DIG;
}
#ifdef CONFIG_LIBC_NUMBERED_ARGS
if ((flags & FL_ARGNUMBER) != 0)
{
value = arglist[argnumber - 1].value.d;
}
else
{
value = va_arg(ap, double);
}
#else
value = va_arg(ap, double);
#endif
ndigs = __dtoa_engine(value, &_dtoa, ndigs,
ndecimal);
exp = _dtoa.exp;
sign = 0;
if (_dtoa.flags & DTOA_MINUS)
{
sign = '-';
}
else if ((flags & FL_PLUS) != 0)
{
sign = '+';
}
else if ((flags & FL_SPACE) != 0)
{
sign = ' ';
}
if (_dtoa.flags & (DTOA_NAN | DTOA_INF))
{
FAR const char *p;
ndigs = sign ? 4 : 3;
if (width > ndigs)
{
width -= ndigs;
if ((flags & FL_LPAD) == 0)
{
do
{
stream_putc(' ', stream);
}
while (--width);
}
}
else
{
width = 0;
}
if (sign)
{
stream_putc(sign, stream);
}
p = "inf";
if (_dtoa.flags & DTOA_NAN)
{
p = "nan";
}
# if ('I'-'i' != 'N'-'n') || ('I'-'i' != 'F'-'f') || ('I'-'i' != 'A'-'a')
# error
# endif
while ((ndigs = *p) != 0)
{
if ((flags & FL_FLTUPP) != 0)
{
ndigs += 'I' - 'i';
}
stream_putc(ndigs, stream);
p++;
}
goto tail;
}
if ((flags & (FL_FLTEXP | FL_FLTFIX)) == 0)
{
/* 'g(G)' format */
prec = ndigs;
/* Remove trailing zeros */
while (ndigs > 0 && _dtoa.digits[ndigs - 1] == '0')
{
ndigs--;
}
if (-4 <= exp && exp < prec)
{
flags |= FL_FLTFIX;
if (exp < 0 || ndigs > exp)
{
prec = ndigs - (exp + 1);
}
else
{
prec = 0;
}
}
else
{
/* Limit displayed precision to available precision */
prec = ndigs - 1;
}
}
/* Conversion result length, width := free space length */
if ((flags & FL_FLTFIX) != 0)
{
n = (exp > 0 ? exp + 1 : 1);
}
else
{
n = 5; /* 1e+00 */
}
if (sign != 0)
{
n += 1;
}
if (prec != 0)
{
n += prec + 1;
}
else if ((flags & FL_ALT) != 0)
{
n += 1;
}
width = width > n ? width - n : 0;
/* Output before first digit */
if ((flags & (FL_LPAD | FL_ZFILL)) == 0)
{
while (width)
{
stream_putc(' ', stream);
width--;
}
}
if (sign != 0)
{
stream_putc(sign, stream);
}
if ((flags & FL_LPAD) == 0)
{
while (width)
{
stream_putc('0', stream);
width--;
}
}
if ((flags & FL_FLTFIX) != 0)
{
/* 'f' format */
char out;
/* At this point, we should have exp exponent of leftmost digit
* in _dtoa.digits ndigs number of buffer digits to print prec
* number of digits after decimal In the loop, 'n' walks over
* the exponent value
*/
n = exp > 0 ? exp : 0; /* Exponent of left digit */
do
{
/* Insert decimal point at correct place */
if (n == -1)
{
stream_putc('.', stream);
}
/* Pull digits from buffer when in-range, otherwise use 0 */
if (0 <= exp - n && exp - n < ndigs)
{
out = _dtoa.digits[exp - n];
}
else
{
out = '0';
}
if (--n < -prec)
{
break;
}
stream_putc(out, stream);
}
while (1);
if (n == exp && (_dtoa.digits[0] > '5' ||
(_dtoa.digits[0] == '5' && !(_dtoa.flags & DTOA_CARRY))))
{
out = '1';
}
stream_putc(out, stream);
if ((flags & FL_ALT) != 0 && n == -1)
{
stream_putc('.', stream);
}
}
else
{
/* 'e(E)' format
*
* Mantissa
*/
if (_dtoa.digits[0] != '1')
{
_dtoa.flags &= ~DTOA_CARRY;
}
stream_putc(_dtoa.digits[0], stream);
if (prec > 0)
{
uint8_t pos;
stream_putc('.', stream);
for (pos = 1; pos < 1 + prec; pos++)
{
stream_putc(pos < ndigs ? _dtoa.digits[pos] : '0',
stream);
}
}
else if ((flags & FL_ALT) != 0)
{
stream_putc('.', stream);
}
/* Exponent */
stream_putc(flags & FL_FLTUPP ? 'E' : 'e', stream);
ndigs = '+';
if (exp < 0 || (exp == 0 && (_dtoa.flags & DTOA_CARRY) != 0))
{
exp = -exp;
ndigs = '-';
}
stream_putc(ndigs, stream);
c = __ultoa_invert(exp, buf, 10) - buf;
if (exp >= 0 && exp <= 9)
{
stream_putc('0', stream);
}
while (c > 0)
{
stream_putc(buf[c - 1], stream);
c--;
}
}
goto tail;
}
#else /* !CONFIG_LIBC_FLOATINGPOINT */
if ((c >= 'E' && c <= 'G') || (c >= 'e' && c <= 'g'))
{
# ifndef CONFIG_LIBC_NUMBERED_ARGS
va_arg(ap, double);
# endif
pnt = "*float*";
size = sizeof("*float*") - 1;
goto str_lpad;
}
#endif
switch (c)
{
case 'c':
#ifdef CONFIG_LIBC_NUMBERED_ARGS
if ((flags & FL_ARGNUMBER) != 0)
{
buf[0] = (int)arglist[argnumber - 1].value.u;
}
else
{
buf[0] = va_arg(ap, int);
}
#else
buf[0] = va_arg(ap, int);
#endif
pnt = buf;
size = 1;
goto str_lpad;
case 's':
case 'S':
#ifdef CONFIG_LIBC_NUMBERED_ARGS
if ((flags & FL_ARGNUMBER) != 0)
{
pnt = arglist[argnumber - 1].value.cp;
}
else
{
pnt = va_arg(ap, FAR char *);
}
#else
pnt = va_arg(ap, FAR char *);
#endif
if (pnt == NULL)
{
pnt = g_nullstring;
}
size = strnlen(pnt, (flags & FL_PREC) ? prec : ~0);
str_lpad:
if ((flags & FL_LPAD) == 0)
{
while (size < width)
{
stream_putc(' ', stream);
width--;
}
}
stream_puts(pnt, size, stream);
width = width >= size ? width - size : 0;
size = 0;
goto tail;
}
if (c == 'd' || c == 'i')
{
#ifndef CONFIG_HAVE_LONG_LONG
long x;
#else
long long x;
if ((flags & FL_LONG) != 0 && (flags & FL_REPD_TYPE) != 0)
{
#ifdef CONFIG_LIBC_NUMBERED_ARGS
if ((flags & FL_ARGNUMBER) != 0)
{
x = (long long)arglist[argnumber - 1].value.ull;
}
else
{
x = va_arg(ap, long long);
}
#else
x = va_arg(ap, long long);
#endif
}
else
#endif
if ((flags & FL_LONG) != 0)
{
#ifdef CONFIG_LIBC_NUMBERED_ARGS
if ((flags & FL_ARGNUMBER) != 0)
{
x = (long)arglist[argnumber - 1].value.ul;
}
else
{
x = va_arg(ap, long);
}
#else
x = va_arg(ap, long);
#endif
}
else
{
#ifdef CONFIG_LIBC_NUMBERED_ARGS
if ((flags & FL_ARGNUMBER) != 0)
{
x = (int)arglist[argnumber - 1].value.u;
}
else
{
x = va_arg(ap, int);
}