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nuttx/libs/libc/stdio/lib_libvsprintf.c
Gregory Nutt 72bc331217 Cosmetic update to some comments.
2019-02-15 18:26:06 -06:00

1593 lines
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/****************************************************************************
* libs/libc/stdio/lib_libvsprintf.c
*
* Copyright (C) 2007-2012, 2018-2019 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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/compiler.h>
#include <wchar.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <nuttx/arch.h>
#include "libc.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define FLAG_SHOWPLUS 0x0001
#define FLAG_ALTFORM 0x0002
#define FLAG_HASDOT 0x0004
#define FLAG_HASASTERISKWIDTH 0x0008
#define FLAG_HASASTERISKTRUNC 0x0010
#define FLAG_LONGPRECISION 0x0020
#define FLAG_LONGLONGPRECISION 0x0040
#define FLAG_NEGATE 0x0080
#define FLAG_NOTRAILINGZERO 0x0100
#define SET_SHOWPLUS(f) do (f) |= FLAG_SHOWPLUS; while (0)
#define SET_ALTFORM(f) do (f) |= FLAG_ALTFORM; while (0)
#define SET_HASDOT(f) do (f) |= FLAG_HASDOT; while (0)
#define SET_HASASTERISKWIDTH(f) do (f) |= FLAG_HASASTERISKWIDTH; while (0)
#define SET_HASASTERISKTRUNC(f) do (f) |= FLAG_HASASTERISKTRUNC; while (0)
#define SET_LONGPRECISION(f) do (f) |= FLAG_LONGPRECISION; while (0)
#define SET_LONGLONGPRECISION(f) do (f) |= FLAG_LONGLONGPRECISION; while (0)
#define SET_NEGATE(f) do (f) |= FLAG_NEGATE; while (0)
#define SET_NOTRAILINGZERO(f) do (f) |= FLAG_NOTRAILINGZERO; while (0)
#define CLR_SHOWPLUS(f) do (f) &= ~FLAG_SHOWPLUS; while (0)
#define CLR_ALTFORM(f) do (f) &= ~FLAG_ALTFORM; while (0)
#define CLR_HASDOT(f) do (f) &= ~FLAG_HASDOT; while (0)
#define CLR_HASASTERISKWIDTH(f) do (f) &= ~FLAG_HASASTERISKWIDTH; while (0)
#define CLR_HASASTERISKTRUNC(f) do (f) &= ~FLAG_HASASTERISKTRUNC; while (0)
#define CLR_LONGPRECISION(f) do (f) &= ~FLAG_LONGPRECISION; while (0)
#define CLR_LONGLONGPRECISION(f) do (f) &= ~FLAG_LONGLONGPRECISION; while (0)
#define CLR_NEGATE(f) do (f) &= ~FLAG_NEGATE; while (0)
#define CLR_SIGNED(f) do (f) &= ~(FLAG_SHOWPLUS|FLAG_NEGATE); while (0)
#define CLR_NOTRAILINGZERO(f) do (f) &= ~FLAG_NOTRAILINGZERO; while (0)
#define IS_SHOWPLUS(f) (((f) & FLAG_SHOWPLUS) != 0)
#define IS_ALTFORM(f) (((f) & FLAG_ALTFORM) != 0)
#define IS_HASDOT(f) (((f) & FLAG_HASDOT) != 0)
#define IS_HASASTERISKWIDTH(f) (((f) & FLAG_HASASTERISKWIDTH) != 0)
#define IS_HASASTERISKTRUNC(f) (((f) & FLAG_HASASTERISKTRUNC) != 0)
#define IS_LONGPRECISION(f) (((f) & FLAG_LONGPRECISION) != 0)
#define IS_LONGLONGPRECISION(f) (((f) & FLAG_LONGLONGPRECISION) != 0)
#define IS_NEGATE(f) (((f) & FLAG_NEGATE) != 0)
#define IS_SIGNED(f) (((f) & (FLAG_SHOWPLUS|FLAG_NEGATE)) != 0)
#define IS_NOTRAILINGZERO(f) (((f) & FLAG_NOTRAILINGZERO) != 0)
/* If CONFIG_ARCH_ROMGETC is defined, then it is assumed that the format
* string data cannot be accessed by simply de-referencing the format string
* pointer. This might be in the case in Harvard architectures where string
* data might be stored in instruction space or if string data were stored
* on some media like EEPROM or external serial FLASH. In all of these cases,
* string data has to be accessed indirectly using the architecture-supplied
* up_romgetc(). The following mechanisms attempt to make these different
* access methods indistinguishable in the following code.
*
* NOTE: It is assumed that string arguments for %s still reside in memory
* that can be directly accessed by de-referencing the string pointer.
*/
#ifdef CONFIG_ARCH_ROMGETC
# define FMT_TOP ch = up_romgetc(src) /* Loop initialization */
# define FMT_BOTTOM src++, ch = up_romgetc(src) /* Bottom of a loop */
# define FMT_CHAR ch /* Access a character */
# define FMT_NEXT src++; ch = up_romgetc(src) /* Advance to the next character */
# define FMT_PREV src--; ch = up_romgetc(src) /* Backup to the previous character */
#else
# define FMT_TOP /* Loop initialization */
# define FMT_BOTTOM src++ /* Bottom of a loop */
# define FMT_CHAR *src /* Access a character */
# define FMT_NEXT src++ /* Advance to the next character */
# define FMT_PREV src-- /* Backup to the previous character */
#endif
/****************************************************************************
* Private Type Declarations
****************************************************************************/
enum
{
FMT_RJUST = 0, /* Default */
FMT_LJUST,
FMT_RJUST0,
FMT_CENTER
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Pointer to ASCII conversion */
#ifdef CONFIG_PTR_IS_NOT_INT
static void ptohex(FAR struct lib_outstream_s *obj, uint16_t flags,
FAR void *p);
static int getsizesize(uint8_t fmt, uint16_t flags, FAR void *p)
#endif /* CONFIG_PTR_IS_NOT_INT */
/* Unsigned int to ASCII conversion */
static void utodec(FAR struct lib_outstream_s *obj, unsigned int n);
static void utohex(FAR struct lib_outstream_s *obj, unsigned int n,
uint8_t a);
static void utooct(FAR struct lib_outstream_s *obj, unsigned int n);
static void utobin(FAR struct lib_outstream_s *obj, unsigned int n);
static void utoascii(FAR struct lib_outstream_s *obj, uint8_t fmt,
uint16_t flags, unsigned int lln);
static void fixup(uint8_t fmt, FAR uint16_t *flags, int *n);
static int getusize(uint8_t fmt, uint16_t flags, unsigned int lln);
/* Unsigned long int to ASCII conversion */
#ifdef CONFIG_LONG_IS_NOT_INT
static void lutodec(FAR struct lib_outstream_s *obj, unsigned long ln);
static void lutohex(FAR struct lib_outstream_s *obj, unsigned long ln,
uint8_t a);
static void lutooct(FAR struct lib_outstream_s *obj, unsigned long ln);
static void lutobin(FAR struct lib_outstream_s *obj, unsigned long ln);
static void lutoascii(FAR struct lib_outstream_s *obj, uint8_t fmt,
uint16_t flags, unsigned long ln);
static void lfixup(uint8_t fmt, FAR uint16_t *flags, long *ln);
static int getlusize(uint8_t fmt, FAR uint16_t flags, unsigned long ln);
#endif
/* Unsigned long long int to ASCII conversions */
#if defined(CONFIG_HAVE_LONG_LONG) && defined(CONFIG_LIBC_LONG_LONG)
static void llutodec(FAR struct lib_outstream_s *obj, unsigned long long lln);
static void llutohex(FAR struct lib_outstream_s *obj, unsigned long long lln,
uint8_t a);
static void llutooct(FAR struct lib_outstream_s *obj, unsigned long long lln);
static void llutobin(FAR struct lib_outstream_s *obj, unsigned long long lln);
static void llutoascii(FAR struct lib_outstream_s *obj, uint8_t fmt,
uint16_t flags, unsigned long long lln);
static void llfixup(uint8_t fmt, FAR uint16_t *flags, FAR long long *lln);
static int getllusize(uint8_t fmt, FAR uint16_t flags,
FAR unsigned long long lln);
#endif
static void prejustify(FAR struct lib_outstream_s *obj, uint8_t fmt,
uint8_t justify, uint16_t flags, int fieldwidth,
int valwidth, int trunc);
static void postjustify(FAR struct lib_outstream_s *obj, uint8_t justify,
uint16_t flags, int fieldwidth, int valwidth,
int trunc);
/****************************************************************************
* Private Constant Data
****************************************************************************/
static const char g_nullstring[] = "(null)";
/****************************************************************************
* Private Functions
****************************************************************************/
/* Include floating point functions */
#ifdef CONFIG_LIBC_FLOATINGPOINT
# include "stdio/lib_libdtoa.c"
#endif
/****************************************************************************
* Name: ptohex
****************************************************************************/
#ifdef CONFIG_PTR_IS_NOT_INT
static void ptohex(FAR struct lib_outstream_s *obj, uint16_t flags,
FAR void *p)
{
union
{
uint32_t dw;
FAR void *p;
} u;
uint8_t bits;
/* Check for alternate form */
if (IS_ALTFORM(flags))
{
/* Prefix the number with "0x" */
obj->put(obj, '0');
obj->put(obj, 'x');
}
u.dw = 0;
u.p = p;
for (bits = CHAR_BIT * sizeof(FAR void *); bits > 0; bits -= 4)
{
uint8_t nibble = (uint8_t)((u.dw >> (bits - 4)) & 0xf);
if (nibble < 10)
{
obj->put(obj, nibble + '0');
}
else
{
obj->put(obj, nibble + 'a' - 10);
}
}
}
/****************************************************************************
* Name: getpsize
****************************************************************************/
static int getpsize(uint16_t flags, FAR void *p)
{
struct lib_outstream_s nulloutstream;
lib_nulloutstream(&nulloutstream);
ptohex(&nulloutstream, flags, p);
return nulloutstream.nput;
}
#endif /* CONFIG_PTR_IS_NOT_INT */
/****************************************************************************
* Name: utodec
****************************************************************************/
static void utodec(FAR struct lib_outstream_s *obj, unsigned int n)
{
char buf[16];
int i = 0;
do
{
buf[i++] = n % 10 + '0';
n /= 10;
}
while (n > 0);
while (i > 0)
{
obj->put(obj, buf[--i]);
}
}
/****************************************************************************
* Name: utohex
****************************************************************************/
static void utohex(FAR struct lib_outstream_s *obj, unsigned int n,
uint8_t a)
{
bool nonzero = false;
uint8_t bits;
for (bits = CHAR_BIT * sizeof(unsigned int); bits > 0; bits -= 4)
{
uint8_t nibble = (uint8_t)((n >> (bits - 4)) & 0xf);
if (nibble || nonzero)
{
nonzero = true;
if (nibble < 10)
{
obj->put(obj, nibble + '0');
}
else
{
obj->put(obj, nibble + a - 10);
}
}
}
if (!nonzero)
{
obj->put(obj, '0');
}
}
/****************************************************************************
* Name: utooct
****************************************************************************/
static void utooct(FAR struct lib_outstream_s *obj, unsigned int n)
{
bool nonzero = false;
uint8_t bits;
for (bits = CHAR_BIT * sizeof(unsigned int); bits > 0; bits -= 3)
{
uint8_t tribit = (uint8_t)((n >> (bits - 3)) & 0x7);
if (tribit || nonzero)
{
nonzero = true;
obj->put(obj, (tribit + '0'));
}
}
if (!nonzero)
{
obj->put(obj, '0');
}
}
/****************************************************************************
* Name: utobin
****************************************************************************/
static void utobin(FAR struct lib_outstream_s *obj, unsigned int n)
{
bool nonzero = false;
uint8_t bits;
for (bits = CHAR_BIT * sizeof(unsigned int); bits > 0; bits -= 1)
{
uint8_t unibit = (uint8_t)((n >> (bits - 1)) & 0x1);
if (unibit || nonzero)
{
nonzero = true;
obj->put(obj, (unibit + '0'));
}
}
if (!nonzero)
{
obj->put(obj, '0');
}
}
/****************************************************************************
* Name: utoascii
****************************************************************************/
static void utoascii(FAR struct lib_outstream_s *obj, uint8_t fmt,
uint16_t flags, unsigned int n)
{
/* Perform the integer conversion according to the format specifier */
switch (fmt)
{
case 'd': /* Signed/unsigned base 10 */
case 'i':
case 'u':
{
/* Convert the integer value to a string. */
utodec(obj, n);
}
break;
#ifndef CONFIG_PTR_IS_NOT_INT
case 'p': /* Hexadecimal */
#endif
case 'x':
case 'X':
{
/* Convert the unsigned value to a string.
*
* NOTE that the alternate form prefix was already applied in
* prejustify().
*/
if (fmt == 'X')
{
utohex(obj, n, 'A');
}
else
{
utohex(obj, n, 'a');
}
}
break;
case 'o': /* Octal */
{
/* Check for alternate form */
if (IS_ALTFORM(flags))
{
/* Prefix the number with '0' */
obj->put(obj, '0');
}
/* Convert the unsigned value to a string. */
utooct(obj, n);
}
break;
case 'b': /* Binary */
{
/* Convert the unsigned value to a string. */
utobin(obj, n);
}
break;
#ifdef CONFIG_PTR_IS_NOT_INT
case 'p':
#endif
default:
break;
}
}
/****************************************************************************
* Name: fixup
****************************************************************************/
static void fixup(uint8_t fmt, FAR uint16_t *flags, FAR int *n)
{
/* Perform the integer conversion according to the format specifier */
switch (fmt)
{
case 'd': /* Signed base 10 */
case 'i':
if (*n < 0)
{
SET_NEGATE(*flags);
CLR_SHOWPLUS(*flags);
*n = -*n;
}
break;
case 'u': /* Unsigned base 10 */
break;
case 'p': /* Hexadecimal */
case 'x':
case 'X':
case 'o': /* Octal */
case 'b': /* Binary */
CLR_SIGNED(*flags);
break;
default:
break;
}
}
/****************************************************************************
* Name: getusize
****************************************************************************/
static int getusize(uint8_t fmt, uint16_t flags, unsigned int n)
{
struct lib_outstream_s nulloutstream;
lib_nulloutstream(&nulloutstream);
utoascii(&nulloutstream, fmt, flags, n);
return nulloutstream.nput;
}
/****************************************************************************
* Name: getdblsize
****************************************************************************/
#ifdef CONFIG_LIBC_FLOATINGPOINT
static int getdblsize(uint8_t fmt, int trunc, uint16_t flags, double n)
{
struct lib_outstream_s nulloutstream;
lib_nulloutstream(&nulloutstream);
lib_dtoa(&nulloutstream, fmt, trunc, flags, n);
return nulloutstream.nput;
}
#endif
#ifdef CONFIG_LONG_IS_NOT_INT
/****************************************************************************
* Name: lutodec
****************************************************************************/
static void lutodec(FAR struct lib_outstream_s *obj, unsigned long n)
{
char buf[32];
int i = 0;
do
{
buf[i++] = n % 10 + '0';
n /= 10;
}
while (n > 0);
while (i > 0)
{
obj->put(obj, buf[--i]);
}
}
/****************************************************************************
* Name: lutohex
****************************************************************************/
static void lutohex(FAR struct lib_outstream_s *obj, unsigned long n,
uint8_t a)
{
bool nonzero = false;
uint8_t bits;
for (bits = CHAR_BIT * sizeof(unsigned long); bits > 0; bits -= 4)
{
uint8_t nibble = (uint8_t)((n >> (bits - 4)) & 0xf);
if (nibble || nonzero)
{
nonzero = true;
if (nibble < 10)
{
obj->put(obj, nibble + '0');
}
else
{
obj->put(obj, nibble + a - 10);
}
}
}
if (!nonzero)
{
obj->put(obj, '0');
}
}
/****************************************************************************
* Name: lutooct
****************************************************************************/
static void lutooct(FAR struct lib_outstream_s *obj, unsigned long n)
{
bool nonzero = false;
uint8_t bits;
for (bits = CHAR_BIT * sizeof(unsigned long); bits > 0; bits -= 3)
{
uint8_t tribit = (uint8_t)((n >> (bits - 3)) & 0x7);
if (tribit || nonzero)
{
nonzero = true;
obj->put(obj, (tribit + '0'));
}
}
if (!nonzero)
{
obj->put(obj, '0');
}
}
/****************************************************************************
* Name: lutobin
****************************************************************************/
static void lutobin(FAR struct lib_outstream_s *obj, unsigned long n)
{
bool nonzero = false;
uint8_t bits;
for (bits = CHAR_BIT * sizeof(unsigned long); bits > 0; bits -= 1)
{
uint8_t unibit = (uint8_t)((n >> (bits - 1)) & 0x1);
if (unibit || nonzero)
{
nonzero = true;
obj->put(obj, (unibit + '0'));
}
}
if (!nonzero)
{
obj->put(obj, '0');
}
}
/****************************************************************************
* Name: lutoascii
****************************************************************************/
static void lutoascii(FAR struct lib_outstream_s *obj, uint8_t fmt,
uint16_t flags, unsigned long ln)
{
/* Perform the integer conversion according to the format specifier */
switch (fmt)
{
case 'd': /* Signed/unsigned base 10 */
case 'i':
case 'u':
{
/* Convert the long integer value to a string. */
lutodec(obj, ln);
}
break;
case 'x': /* Hexadecimal */
case 'X':
{
/* Convert the unsigned value to a string.
*
* NOTE that the alternate form prefix was already applied in
* prejustify().
*/
if (fmt == 'X')
{
lutohex(obj, ln, 'A');
}
else
{
lutohex(obj, ln, 'a');
}
}
break;
case 'o': /* Octal */
{
/* Check for alternate form */
if (IS_ALTFORM(flags))
{
/* Prefix the number with '0' */
obj->put(obj, '0');
}
/* Convert the unsigned value to a string. */
lutooct(obj, ln);
}
break;
case 'b': /* Binary */
{
/* Convert the unsigned value to a string. */
lutobin(obj, ln);
}
break;
case 'p':
default:
break;
}
}
/****************************************************************************
* Name: lfixup
****************************************************************************/
static void lfixup(uint8_t fmt, FAR uint16_t *flags, FAR long *ln)
{
/* Perform the integer conversion according to the format specifier */
switch (fmt)
{
case 'd': /* Signed base 10 */
case 'i':
if (*ln < 0)
{
SET_NEGATE(*flags);
CLR_SHOWPLUS(*flags);
*ln = -*ln;
}
break;
case 'u': /* Unsigned base 10 */
break;
case 'p': /* Hexadecimal */
case 'x':
case 'X':
case 'o': /* Octal */
case 'b': /* Binary */
CLR_SIGNED(*flags);
break;
default:
break;
}
}
/****************************************************************************
* Name: getlusize
****************************************************************************/
static int getlusize(uint8_t fmt, uint16_t flags, unsigned long ln)
{
struct lib_outstream_s nulloutstream;
lib_nulloutstream(&nulloutstream);
lutoascii(&nulloutstream, fmt, flags, ln);
return nulloutstream.nput;
}
#endif /* CONFIG_LONG_IS_NOT_INT */
#if defined(CONFIG_HAVE_LONG_LONG) && defined(CONFIG_LIBC_LONG_LONG)
/****************************************************************************
* Name: llutodec
****************************************************************************/
static void llutodec(FAR struct lib_outstream_s *obj, unsigned long long n)
{
char buf[32];
int i = 0;
do
{
buf[i++] = n % 10 + '0';
n /= 10;
}
while (n > 0);
while (i > 0)
{
obj->put(obj, buf[--i]);
}
}
/****************************************************************************
* Name: llutohex
****************************************************************************/
static void llutohex(FAR struct lib_outstream_s *obj, unsigned long long n,
uint8_t a)
{
bool nonzero = false;
uint8_t bits;
for (bits = CHAR_BIT*sizeof(unsigned long long); bits > 0; bits -= 4)
{
uint8_t nibble = (uint8_t)((n >> (bits - 4)) & 0xf);
if (nibble || nonzero)
{
nonzero = true;
if (nibble < 10)
{
obj->put(obj, (nibble + '0'));
}
else
{
obj->put(obj, (nibble + a - 10));
}
}
}
if (!nonzero)
{
obj->put(obj, '0');
}
}
/****************************************************************************
* Name: llutooct
****************************************************************************/
static void llutooct(FAR struct lib_outstream_s *obj, unsigned long long n)
{
bool nonzero = false;
uint8_t bits;
for (bits = CHAR_BIT * sizeof(unsigned long long); bits > 0; bits -= 3)
{
uint8_t tribit = (uint8_t)((n >> (bits - 3)) & 0x7);
if (tribit || nonzero)
{
nonzero = true;
obj->put(obj, (tribit + '0'));
}
}
if (!nonzero)
{
obj->put(obj, '0');
}
}
/****************************************************************************
* Name: llutobin
****************************************************************************/
static void llutobin(FAR struct lib_outstream_s *obj, unsigned long long n)
{
bool nonzero = false;
uint8_t bits;
for (bits = CHAR_BIT * sizeof(unsigned long long); bits > 0; bits -= 1)
{
uint8_t unibit = (uint8_t)((n >> (bits - 1)) & 0x1);
if (unibit || nonzero)
{
nonzero = true;
obj->put(obj, (unibit + '0'));
}
}
if (!nonzero)
{
obj->put(obj, '0');
}
}
/****************************************************************************
* Name: llutoascii
****************************************************************************/
static void llutoascii(FAR struct lib_outstream_s *obj, uint8_t fmt,
uint16_t flags, unsigned long long lln)
{
/* Perform the integer conversion according to the format specifier */
switch (fmt)
{
case 'd': /* Signed/unsigned base 10 */
case 'i':
case 'u':
{
/* Convert the long long integer value to a string. */
llutodec(obj, (unsigned long long)lln);
}
break;
case 'x': /* Hexadecimal */
case 'X':
{
/* Convert the unsigned value to a string.
*
* NOTE that the alternate form prefix was already applied in
* prejustify().
*/
if (fmt == 'X')
{
llutohex(obj, (unsigned long long)lln, 'A');
}
else
{
llutohex(obj, (unsigned long long)lln, 'a');
}
}
break;
case 'o': /* Octal */
{
/* Check for alternate form */
if (IS_ALTFORM(flags))
{
/* Prefix the number with '0' */
obj->put(obj, '0');
}
/* Convert the unsigned value to a string. */
llutooct(obj, (unsigned long long)lln);
}
break;
case 'b': /* Binary */
{
/* Convert the unsigned value to a string. */
llutobin(obj, (unsigned long long)lln);
}
break;
case 'p':
default:
break;
}
}
/****************************************************************************
* Name: llfixup
****************************************************************************/
static void llfixup(uint8_t fmt, FAR uint16_t *flags, FAR long long *lln)
{
/* Perform the integer conversion according to the format specifier */
switch (fmt)
{
case 'd': /* Signed base 10 */
case 'i':
if (*lln < 0)
{
SET_NEGATE(*flags);
CLR_SHOWPLUS(*flags);
*lln = -*lln;
}
break;
case 'u': /* Unsigned base 10 */
break;
case 'p': /* Hexadecimal */
case 'x':
case 'X':
case 'o': /* Octal */
case 'b': /* Binary */
CLR_SIGNED(*flags);
break;
default:
break;
}
}
/****************************************************************************
* Name: getllusize
****************************************************************************/
static int getllusize(uint8_t fmt, uint16_t flags, unsigned long long lln)
{
struct lib_outstream_s nulloutstream;
lib_nulloutstream(&nulloutstream);
llutoascii(&nulloutstream, fmt, flags, lln);
return nulloutstream.nput;
}
#endif /* CONFIG_HAVE_LONG_LONG */
/****************************************************************************
* Name: prejustify
****************************************************************************/
static void prejustify(FAR struct lib_outstream_s *obj, uint8_t fmt,
uint8_t justify, uint16_t flags, int fieldwidth,
int valwidth, int trunc)
{
bool althex = (fmt == 'x' || fmt == 'X' || fmt == 'p' || fmt == 'P')
&& IS_ALTFORM(flags);
int i;
/* If there is integer precision, then use FMT_RJUST vs FMT_RJUST0 */
if (trunc > 0 && justify == FMT_RJUST0)
{
/* Force right justification in the case. Leading zeros application
* only to "precision" which is implied anyway.
*/
justify = FMT_RJUST;
}
switch (justify)
{
default:
case FMT_RJUST:
{
/* Pad with spaces up to the size of the precision (aka 'trunc')
* then with zeroes to the size of the value width.
*/
if (trunc > valwidth)
{
int padlen = fieldwidth - trunc;
if (IS_SIGNED(flags))
{
padlen--;
}
if (althex)
{
padlen -= 2;
}
for (i = padlen; i > 0; i--)
{
obj->put(obj, ' ');
}
if (IS_NEGATE(flags))
{
obj->put(obj, '-');
}
else if (IS_SHOWPLUS(flags))
{
obj->put(obj, '+');
}
if (althex)
{
obj->put(obj, '0');
obj->put(obj, 'x');
}
for (i = trunc - valwidth; i > 0; i--)
{
obj->put(obj, '0');
}
}
else
{
/* Add a leading minus sign */
if (IS_SIGNED(flags))
{
valwidth++;
}
if (althex)
{
valwidth += 2;
}
for (i = fieldwidth - valwidth; i > 0; i--)
{
obj->put(obj, ' ');
}
if (IS_NEGATE(flags))
{
obj->put(obj, '-');
}
else if (IS_SHOWPLUS(flags))
{
obj->put(obj, '+');
}
if (althex)
{
obj->put(obj, '0');
obj->put(obj, 'x');
}
}
}
break;
case FMT_RJUST0:
{
if (IS_NEGATE(flags))
{
obj->put(obj, '-');
valwidth++;
}
else if (IS_SHOWPLUS(flags))
{
obj->put(obj, '+');
valwidth++;
}
if (althex)
{
obj->put(obj, '0');
obj->put(obj, 'x');
valwidth += 2;
}
for (i = fieldwidth - valwidth; i > 0; i--)
{
obj->put(obj, '0');
}
}
break;
case FMT_LJUST:
{
if (IS_NEGATE(flags))
{
obj->put(obj, '-');
}
else if (IS_SHOWPLUS(flags))
{
obj->put(obj, '+');
}
if (althex)
{
obj->put(obj, '0');
obj->put(obj, 'x');
}
/* Pad with zeros up to the size of the value width. */
for (i = trunc - valwidth; i > 0; i--)
{
obj->put(obj, '0');
}
}
break;
}
}
/****************************************************************************
* Name: postjustify
****************************************************************************/
static void postjustify(FAR struct lib_outstream_s *obj, uint8_t justify,
uint16_t flags, int fieldwidth, int valwidth,
int trunc)
{
int i;
/* Apply field justification to the integer value. */
switch (justify)
{
default:
case FMT_RJUST:
case FMT_RJUST0:
break;
case FMT_LJUST:
{
int width;
if (IS_SIGNED(flags))
{
valwidth++;
}
width = valwidth < trunc ? trunc : valwidth;
for (i = fieldwidth - width; i > 0; i--)
{
obj->put(obj, ' ');
}
}
break;
}
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: lib_vsprintf
*
* Description:
* Stream-oriented implementation that underlies printf family: printf,
* fprint, sprint, etc.
*
****************************************************************************/
int lib_vsprintf(FAR struct lib_outstream_s *obj, FAR const IPTR char *src,
va_list ap)
{
FAR char *ptmp;
uint16_t flags;
uint8_t justify;
#ifdef CONFIG_ARCH_ROMGETC
char ch;
#endif
int width;
int trunc;
for (FMT_TOP; FMT_CHAR; FMT_BOTTOM)
{
/* Just copy regular characters */
if (FMT_CHAR != '%')
{
/* Output the character */
obj->put(obj, FMT_CHAR);
/* Flush the buffer if a newline is encountered */
if (FMT_CHAR == '\n')
{
/* Should return an error on a failure to flush */
(void)obj->flush(obj);
}
/* Process the next character in the format */
continue;
}
/* We have found a format specifier. Move past it. */
FMT_NEXT;
/* Assume defaults */
flags = 0;
justify = FMT_RJUST;
width = 0;
trunc = 0;
/* Process each format qualifier. */
for (; FMT_CHAR; FMT_BOTTOM)
{
/* Break out of the loop when the format is known. */
if (strchr("diuxXpobeEfgGlLsc%", FMT_CHAR))
{
break;
}
/* Check for left justification. */
else if (FMT_CHAR == '-')
{
justify = FMT_LJUST;
}
/* Check for leading zero fill right justification. */
else if (FMT_CHAR == '0')
{
justify = FMT_RJUST0;
}
#if 0
/* Center justification. */
else if (FMT_CHAR == '~')
{
justify = FMT_CENTER;
}
#endif
else if (FMT_CHAR == '*')
{
int value = va_arg(ap, int);
if (IS_HASDOT(flags))
{
trunc = value;
SET_HASASTERISKTRUNC(flags);
}
else
{
width = value;
SET_HASASTERISKWIDTH(flags);
}
}
/* Check for field width */
else if (FMT_CHAR >= '1' && FMT_CHAR <= '9')
{
/* Accumulate the field width integer. */
int n = ((int)(FMT_CHAR)) - (int)'0';
for (; ; )
{
FMT_NEXT;
if (FMT_CHAR >= '0' && FMT_CHAR <= '9')
{
n = 10*n + (((int)(FMT_CHAR)) - (int)'0');
}
else
{
break;
}
}
if (IS_HASDOT(flags))
{
trunc = n;
}
else
{
width = n;
}
/* Back up to the last digit. */
FMT_PREV;
}
/* Check for a decimal point. */
else if (FMT_CHAR == '.')
{
SET_HASDOT(flags);
}
/* Check for leading plus sign. */
else if (FMT_CHAR == '+')
{
SET_SHOWPLUS(flags);
}
/* Check for alternate form. */
else if (FMT_CHAR == '#')
{
SET_ALTFORM(flags);
}
}
/* "%%" means that a literal '%' was intended (instead of a format
* specification).
*/
if (FMT_CHAR == '%')
{
obj->put(obj, '%');
continue;
}
/* Check for the string format. */
if (FMT_CHAR == 's')
{
int swidth;
int left;
/* Get the string to output */
ptmp = va_arg(ap, FAR char *);
if (!ptmp)
{
ptmp = (FAR char *)g_nullstring;
}
/* Get the width of the string and perform right-justification
* operations.
*/
swidth = (IS_HASDOT(flags) && trunc >= 0)
? strnlen(ptmp, trunc) : strlen(ptmp);
prejustify(obj, FMT_CHAR, justify, 0, width, swidth, 0);
left = swidth;
/* Concatenate the string into the output */
while (*ptmp)
{
if (left-- <= 0)
{
break;
}
obj->put(obj, *ptmp);
ptmp++;
}
/* Perform left-justification operations. */
postjustify(obj, justify, 0, width, swidth, 0);
continue;
}
/* Check for the character output */
else if (FMT_CHAR == 'c')
{
/* Just copy the character into the output. */
int n = va_arg(ap, int);
obj->put(obj, n);
continue;
}
/* Check for the long long prefix. */
if (FMT_CHAR == 'L')
{
SET_LONGLONGPRECISION(flags);
FMT_NEXT;
}
else if (FMT_CHAR == 'l')
{
SET_LONGPRECISION(flags);
FMT_NEXT;
if (FMT_CHAR == 'l')
{
SET_LONGLONGPRECISION(flags);
FMT_NEXT;
}
}
/* Handle integer conversions */
if (strchr("diuxXpob", FMT_CHAR))
{
#if defined(CONFIG_HAVE_LONG_LONG) && defined(CONFIG_LIBC_LONG_LONG)
if (IS_LONGLONGPRECISION(flags) && FMT_CHAR != 'p')
{
long long lln;
int lluwidth;
/* Extract the long long value. */
lln = va_arg(ap, long long);
/* Resolve sign-ness and format issues */
llfixup(FMT_CHAR, &flags, &lln);
/* Get the width of the output */
lluwidth = getllusize(FMT_CHAR, flags, lln);
/* Perform left field justification actions */
prejustify(obj, FMT_CHAR, justify, flags, width, lluwidth,
trunc);
/* Output the number */
llutoascii(obj, FMT_CHAR, flags, (unsigned long long)lln);
/* Perform right field justification actions */
postjustify(obj, justify, flags, width, lluwidth, trunc);
}
else
#endif /* CONFIG_HAVE_LONG_LONG */
#ifdef CONFIG_LONG_IS_NOT_INT
if (IS_LONGPRECISION(flags) && FMT_CHAR != 'p')
{
long ln;
int luwidth;
/* Extract the long value. */
ln = va_arg(ap, long);
/* Resolve sign-ness and format issues */
lfixup(FMT_CHAR, &flags, &ln);
/* Get the width of the output */
luwidth = getlusize(FMT_CHAR, flags, ln);
/* Perform left field justification actions */
prejustify(obj, FMT_CHAR, justify, flags, width, trunc);
/* Output the number */
lutoascii(obj, FMT_CHAR, flags, (unsigned long)ln);
/* Perform right field justification actions */
postjustify(obj, justify, flags, width, luwidth, trunc);
}
else
#endif /* CONFIG_LONG_IS_NOT_INT */
#ifdef CONFIG_PTR_IS_NOT_INT
if (FMT_CHAR == 'p')
{
void *p;
int pwidth;
/* Extract the integer value. */
p = va_arg(ap, void *);
/* Resolve sign-ness and format issues */
lfixup(FMT_CHAR, &flags, &ln);
/* Get the width of the output */
pwidth = getpsize(FMT_CHAR, flags, p);
/* Perform left field justification actions */
prejustify(obj, FMT_CHAR, justify, flags, width, pwidth, 0);
/* Output the pointer value */
ptohex(obj, flags, p);
/* Perform right field justification actions */
postjustify(obj, justify, flags, width, pwidth, 0);
}
else
#endif
{
int uwidth;
int n;
/* Extract the long long value. */
n = va_arg(ap, int);
/* Resolve sign-ness and format issues */
fixup(FMT_CHAR, &flags, &n);
/* Get the width of the output */
uwidth = getusize(FMT_CHAR, flags, n);
/* Perform left field justification actions */
prejustify(obj, FMT_CHAR, justify, flags, width, uwidth,
trunc);
/* Output the number */
utoascii(obj, FMT_CHAR, flags, (unsigned int)n);
/* Perform right field justification actions */
postjustify(obj, justify, flags, width, uwidth, trunc);
}
}
/* Handle floating point conversions */
#ifdef CONFIG_LIBC_FLOATINGPOINT
else if (strchr("eEfgG", FMT_CHAR))
{
double dblval = va_arg(ap, double);
int dblsize;
if (FMT_CHAR == 'g' || FMT_CHAR == 'G')
{
flags |= FLAG_NOTRAILINGZERO;
}
/* Get the width of the output */
dblsize = getdblsize(FMT_CHAR, trunc, flags, dblval);
/* Perform left field justification actions */
prejustify(obj, FMT_CHAR, justify, 0, width, dblsize, 0);
/* Output the number */
lib_dtoa(obj, FMT_CHAR, trunc, flags, dblval);
/* Perform right field justification actions */
postjustify(obj, justify, 0, width, dblsize, 0);
}
#endif /* CONFIG_LIBC_FLOATINGPOINT */
}
return obj->nput;
}
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