tinyprintf.c

/*
Copyright (c) 2004,2012 Kustaa Nyholm / SpareTimeLabs
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * 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.
    * Neither the name of Kustaa Nyholm or SpareTimeLabs 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 COPYRIGHT HOLDER 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.
*/

#include "tinyprintf.h"


/*
 * Configuration
 */

/* Enable long int support */
#define PRINTF_LONG_SUPPORT

/* Enable long long int support (implies long int support) */
#define PRINTF_LONG_LONG_SUPPORT

/* Enable %z (size_t) support */
#define PRINTF_SIZE_T_SUPPORT

/*
 * Configuration adjustments
 */
#ifdef PRINTF_SIZE_T_SUPPORT
#include <sys/types.h>
#endif

#ifdef PRINTF_LONG_LONG_SUPPORT
# define PRINTF_LONG_SUPPORT
#endif

/* __SIZEOF_<type>__ defined at least by gcc */
#ifdef __SIZEOF_POINTER__
# define SIZEOF_POINTER __SIZEOF_POINTER__
#endif
#ifdef __SIZEOF_LONG_LONG__
# define SIZEOF_LONG_LONG __SIZEOF_LONG_LONG__
#endif
#ifdef __SIZEOF_LONG__
# define SIZEOF_LONG __SIZEOF_LONG__
#endif
#ifdef __SIZEOF_INT__
# define SIZEOF_INT __SIZEOF_INT__
#endif

#ifdef __GNUC__
# define _TFP_GCC_NO_INLINE_  __attribute__ ((noinline))
#else
# define _TFP_GCC_NO_INLINE_
#endif

/*
 * Implementation
 */
struct param {
    char lz:1;          
    char alt:1;         
    char uc:1;          
    char align_left:1;  
    unsigned int width; 
    char sign;          
    unsigned int base;  
    char *bf;           
};


#ifdef PRINTF_LONG_LONG_SUPPORT
static void _TFP_GCC_NO_INLINE_ ulli2a(
    unsigned long long int num, struct param *p)
{
    int n = 0;
    unsigned long long int d = 1;
    char *bf = p->bf;
    while (num / d >= p->base)
        d *= p->base;
    while (d != 0) {
        int dgt = num / d;
        num %= d;
        d /= p->base;
        if (n || dgt > 0 || d == 0) {
            *bf++ = dgt + (dgt < 10 ? '0' : (p->uc ? 'A' : 'a') - 10);
            ++n;
        }
    }
    *bf = 0;
}

static void lli2a(long long int num, struct param *p)
{
    if (num < 0) {
        num = -num;
        p->sign = '-';
    }
    ulli2a(num, p);
}
#endif

#ifdef PRINTF_LONG_SUPPORT
static void uli2a(unsigned long int num, struct param *p)
{
    int n = 0;
    unsigned long int d = 1;
    char *bf = p->bf;
    while (num / d >= p->base)
        d *= p->base;
    while (d != 0) {
        int dgt = num / d;
        num %= d;
        d /= p->base;
        if (n || dgt > 0 || d == 0) {
            *bf++ = dgt + (dgt < 10 ? '0' : (p->uc ? 'A' : 'a') - 10);
            ++n;
        }
    }
    *bf = 0;
}

static void li2a(long num, struct param *p)
{
    if (num < 0) {
        num = -num;
        p->sign = '-';
    }
    uli2a(num, p);
}
#endif

static void ui2a(unsigned int num, struct param *p)
{
    int n = 0;
    unsigned int d = 1;
    char *bf = p->bf;
    while (num / d >= p->base)
        d *= p->base;
    while (d != 0) {
        int dgt = num / d;
        num %= d;
        d /= p->base;
        if (n || dgt > 0 || d == 0) {
            *bf++ = dgt + (dgt < 10 ? '0' : (p->uc ? 'A' : 'a') - 10);
            ++n;
        }
    }
    *bf = 0;
}

static void i2a(int num, struct param *p)
{
    if (num < 0) {
        num = -num;
        p->sign = '-';
    }
    ui2a(num, p);
}

static int a2d(char ch)
{
    if (ch >= '0' && ch <= '9')
        return ch - '0';
    else if (ch >= 'a' && ch <= 'f')
        return ch - 'a' + 10;
    else if (ch >= 'A' && ch <= 'F')
        return ch - 'A' + 10;
    else
        return -1;
}

static char a2u(char ch, const char **src, int base, unsigned int *nump)
{
    const char *p = *src;
    unsigned int num = 0;
    int digit;
    while ((digit = a2d(ch)) >= 0) {
        if (digit > base)
            break;
        num = num * base + digit;
        ch = *p++;
    }
    *src = p;
    *nump = num;
    return ch;
}

static void putchw(void *putp, putcf putf, struct param *p)
{
    char ch;
    int n = p->width;
    char *bf = p->bf;

    /* Number of filling characters */
    while (*bf++ && n > 0)
        n--;
    if (p->sign)
        n--;
    if (p->alt && p->base == 16)
        n -= 2;
    else if (p->alt && p->base == 8)
        n--;

    /* Fill with space to align to the right, before alternate or sign */
    if (!p->lz && !p->align_left) {
        while (n-- > 0)
            putf(putp, ' ');
    }

    /* print sign */
    if (p->sign)
        putf(putp, p->sign);

    /* Alternate */
    if (p->alt && p->base == 16) {
        putf(putp, '0');
        putf(putp, (p->uc ? 'X' : 'x'));
    } else if (p->alt && p->base == 8) {
        putf(putp, '0');
    }

    /* Fill with zeros, after alternate or sign */
    if (p->lz) {
        while (n-- > 0)
            putf(putp, '0');
    }

    /* Put actual buffer */
    bf = p->bf;
    while ((ch = *bf++))
        putf(putp, ch);

    /* Fill with space to align to the left, after string */
    if (!p->lz && p->align_left) {
        while (n-- > 0)
            putf(putp, ' ');
    }
}

void tfp_format(void *putp, putcf putf, const char *fmt, va_list va)
{
    struct param p;
#ifdef PRINTF_LONG_SUPPORT
    char bf[23];  /* long = 64b on some architectures */
#else
    char bf[12];  /* int = 32b on some architectures */
#endif
    char ch;
    p.bf = bf;

    while ((ch = *(fmt++))) {
        if (ch != '%') {
            putf(putp, ch);
        } else {
#ifdef PRINTF_LONG_SUPPORT
            char lng = 0;  /* 1 for long, 2 for long long */
#endif
            /* Init parameter struct */
            p.lz = 0;
            p.alt = 0;
            p.width = 0;
            p.align_left = 0;
            p.sign = 0;

            /* Flags */
            while ((ch = *(fmt++))) {
                switch (ch) {
                case '-':
                    p.align_left = 1;
                    continue;
                case '0':
                    p.lz = 1;
                    continue;
                case '#':
                    p.alt = 1;
                    continue;
                default:
                    break;
                }
                break;
            }

            /* Width */
            if (ch >= '0' && ch <= '9') {
                ch = a2u(ch, &fmt, 10, &(p.width));
            }

            /* We accept 'x.y' format but don't support it completely:
             * we ignore the 'y' digit => this ignores 0-fill
             * size and makes it == width (ie. 'x') */
            if (ch == '.') {
              p.lz = 1;  /* zero-padding */
              /* ignore actual 0-fill size: */
              do {
                ch = *(fmt++);
              } while ((ch >= '0') && (ch <= '9'));
            }

#ifdef PRINTF_SIZE_T_SUPPORT
# ifdef PRINTF_LONG_SUPPORT
            if (ch == 'z') {
                ch = *(fmt++);
                if (sizeof(size_t) == sizeof(unsigned long int))
                    lng = 1;
#  ifdef PRINTF_LONG_LONG_SUPPORT
                else if (sizeof(size_t) == sizeof(unsigned long long int))
                    lng = 2;
#  endif
            } else
# endif
#endif

#ifdef PRINTF_LONG_SUPPORT
            if (ch == 'l') {
                ch = *(fmt++);
                lng = 1;
#ifdef PRINTF_LONG_LONG_SUPPORT
                if (ch == 'l') {
                  ch = *(fmt++);
                  lng = 2;
                }
#endif
            }
#endif
            switch (ch) {
            case 0:
                goto abort;
            case 'u':
                p.base = 10;
#ifdef PRINTF_LONG_SUPPORT
#ifdef PRINTF_LONG_LONG_SUPPORT
                if (2 == lng)
                    ulli2a(va_arg(va, unsigned long long int), &p);
                else
#endif
                  if (1 == lng)
                    uli2a(va_arg(va, unsigned long int), &p);
                else
#endif
                    ui2a(va_arg(va, unsigned int), &p);
                putchw(putp, putf, &p);
                break;
            case 'd':
            case 'i':
                p.base = 10;
#ifdef PRINTF_LONG_SUPPORT
#ifdef PRINTF_LONG_LONG_SUPPORT
                if (2 == lng)
                    lli2a(va_arg(va, long long int), &p);
                else
#endif
                  if (1 == lng)
                    li2a(va_arg(va, long int), &p);
                else
#endif
                    i2a(va_arg(va, int), &p);
                putchw(putp, putf, &p);
                break;
#ifdef SIZEOF_POINTER
            case 'p':
                p.alt = 1;
# if defined(SIZEOF_INT) && SIZEOF_POINTER <= SIZEOF_INT
                lng = 0;
# elif defined(SIZEOF_LONG) && SIZEOF_POINTER <= SIZEOF_LONG
                lng = 1;
# elif defined(SIZEOF_LONG_LONG) && SIZEOF_POINTER <= SIZEOF_LONG_LONG
                lng = 2;
# endif
#endif
            case 'x':
            case 'X':
                p.base = 16;
                p.uc = (ch == 'X')?1:0;
#ifdef PRINTF_LONG_SUPPORT
#ifdef PRINTF_LONG_LONG_SUPPORT
                if (2 == lng)
                    ulli2a(va_arg(va, unsigned long long int), &p);
                else
#endif
                  if (1 == lng)
                    uli2a(va_arg(va, unsigned long int), &p);
                else
#endif
                    ui2a(va_arg(va, unsigned int), &p);
                putchw(putp, putf, &p);
                break;
            case 'o':
                p.base = 8;
                ui2a(va_arg(va, unsigned int), &p);
                putchw(putp, putf, &p);
                break;
            case 'c':
                putf(putp, (char)(va_arg(va, int)));
                break;
            case 's':
                p.bf = va_arg(va, char *);
                putchw(putp, putf, &p);
                p.bf = bf;
                break;
            case '%':
                putf(putp, ch);
            default:
                break;
            }
        }
    }
 abort:;
}

#if TINYPRINTF_DEFINE_TFP_PRINTF
static putcf stdout_putf;
static void *stdout_putp;

void init_printf(void *putp, putcf putf)
{
    stdout_putf = putf;
    stdout_putp = putp;
}

void tfp_printf(char *fmt, ...)
{
    va_list va;
    va_start(va, fmt);
    tfp_format(stdout_putp, stdout_putf, fmt, va);
    //To inform that the printf line is done
    stdout_putf((void *)START_TX,0);
    va_end(va);
}
#endif

#if TINYPRINTF_DEFINE_TFP_SPRINTF
struct _vsnprintf_putcf_data
{
  size_t dest_capacity;
  char *dest;
  size_t num_chars;
};

static void _vsnprintf_putcf(void *p, char c)
{
  struct _vsnprintf_putcf_data *data = (struct _vsnprintf_putcf_data*)p;
  if (data->num_chars < data->dest_capacity)
    data->dest[data->num_chars] = c;
  data->num_chars ++;
}

int tfp_vsnprintf(char *str, size_t size, const char *format, va_list ap)
{
  struct _vsnprintf_putcf_data data;

  if (size < 1)
    return 0;

  data.dest = str;
  data.dest_capacity = size-1;
  data.num_chars = 0;
  tfp_format(&data, _vsnprintf_putcf, format, ap);

  if (data.num_chars < data.dest_capacity)
    data.dest[data.num_chars] = '\0';
  else
    data.dest[data.dest_capacity] = '\0';

  return data.num_chars;
}

int tfp_snprintf(char *str, size_t size, const char *format, ...)
{
  va_list ap;
  int retval;

  va_start(ap, format);
  retval = tfp_vsnprintf(str, size, format, ap);
  va_end(ap);
  return retval;
}

struct _vsprintf_putcf_data
{
  char *dest;
  size_t num_chars;
};

static void _vsprintf_putcf(void *p, char c)
{
  struct _vsprintf_putcf_data *data = (struct _vsprintf_putcf_data*)p;
  data->dest[data->num_chars++] = c;
}

int tfp_vsprintf(char *str, const char *format, va_list ap)
{
  struct _vsprintf_putcf_data data;
  data.dest = str;
  data.num_chars = 0;
  tfp_format(&data, _vsprintf_putcf, format, ap);
  data.dest[data.num_chars] = '\0';
  return data.num_chars;
}

int tfp_sprintf(char *str, const char *format, ...)
{
  va_list ap;
  int retval;

  va_start(ap, format);
  retval = tfp_vsprintf(str, format, ap);
  va_end(ap);
  return retval;
}
#endif