snprintf.h

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/*
 Unix snprintf implementation.
 Version 1.4

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU Library General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU Library General Public License for more details.

   You should have received a copy of the GNU Library General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

   Revision History:
                   see header of snprintf.c.

format:
  int snprintf(holder, sizeof_holder, format, ...)

Return values:
  (sizeof_holder - 1)


 THANKS(for the patches and ideas):
     Miles Bader
     Cyrille Rustom
     Jacek Slabocewiz
     Mike Parker(mouse)

Alain Magloire: [e-mail]
*/

#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif

#include <stdlib.h>    /* for atoi() */
#include <ctype.h>


/*
 * For the FLOATING POINT FORMAT :
 *  the challenge was finding a way to
 *  manipulate the Real numbers without having
 *  to resort to mathematical function(it
 *  would require to link with -lm) and not
 *  going down to the bit pattern(not portable)
 *
 *  so a number, a real is:

      real = integral + fraction

      integral = ... + a(2)*10^2 + a(1)*10^1 + a(0)*10^0
      fraction = b(1)*10^-1 + b(2)*10^-2 + ...

      where:
       0 <= a(i) => 9
       0 <= b(i) => 9

    from then it was simple math
 */

/*
 * size of the buffer for the integral part
 * and the fraction part
 */
#define MAX_INT  99 + 1 /* 1 for the null */
#define MAX_FRACT 29 + 1

/*
 * If the compiler supports (long long)
 */
#ifndef LONG_LONG
# define LONG_LONG long long
/*# define LONG_LONG int64_t*/
#endif

/*
 * If the compiler supports (long double)
 */
#ifndef LONG_DOUBLE
# define LONG_DOUBLE long double
/*# define LONG_DOUBLE double*/
#endif

/*
 * numtoa() uses PRIVATE buffers to store the results,
 * So this function is not reentrant
 */
#define itoa(n) numtoa(n, 10, 0, (char **)0)
#define otoa(n) numtoa(n, 8, 0, (char **)0)
#define htoa(n) numtoa(n, 16, 0, (char **)0)
#define dtoa(n, p, f) numtoa(n, 10, p, f)

#define SWAP_INT(a,b) {int t; t = (a); (a) = (b); (b) = t;}

/* this struct holds everything we need */
struct DATA {
  int length;
  char *holder;
  int counter;
#ifdef __STDC__
  const char *pf;
#else
  char *pf;
#endif
/* FLAGS */
  int width, precision;
  int justify; char pad;
  int square, space, star_w, star_p, a_long, a_longlong;
};

#define PRIVATE static
#define PUBLIC
/* signature of the functions */
#ifdef __STDC__
/* the floating point stuff */
  PRIVATE double pow_10(int);
  PRIVATE int log_10(double);
  PRIVATE double integral(double, double *);
  PRIVATE char * numtoa(double, int, int, char **);

/* for the format */
  PRIVATE void conv_flag(char *, struct DATA *);
  PRIVATE void floating(struct DATA *, double);
  PRIVATE void exponent(struct DATA *, double);
  PRIVATE void decimal(struct DATA *, double);
  PRIVATE void octal(struct DATA *, double);
  PRIVATE void hexa(struct DATA *, double);
  PRIVATE void strings(struct DATA *, char *);

#else
/* the floating point stuff */
  PRIVATE double pow_10();
  PRIVATE int log_10();
  PRIVATE double integral();
  PRIVATE char * numtoa();

/* for the format */
  PRIVATE void conv_flag();
  PRIVATE void floating();
  PRIVATE void exponent();
  PRIVATE void decimal();
  PRIVATE void octal();
  PRIVATE void hexa();
  PRIVATE void strings();
#endif

/* those are defines specific to snprintf to hopefully
 * make the code clearer :-)
 */
#define RIGHT 1
#define LEFT  0
#define NOT_FOUND -1
#define FOUND 1
#define MAX_FIELD 15

/* the conversion flags */
#define isflag(c) ((c) == '#' || (c) == ' ' || \
                   (c) == '*' || (c) == '+' || \
                   (c) == '-' || (c) == '.' || \
                   isdigit(c))

/* round off to the precision */
#define ROUND(d, p) \
            (d < 0.) ? \
             d - pow_10(-(p)->precision) * 0.5 : \
             d + pow_10(-(p)->precision) * 0.5

/* set default precision */
#define DEF_PREC(p) \
            if ((p)->precision == NOT_FOUND) \
              (p)->precision = 6

/* put a char */
#define PUT_CHAR(c, p) \
            if ((p)->counter < (p)->length) { \
              *(p)->holder++ = (c); \
              (p)->counter++; \
            }

#define PUT_PLUS(d, p) \
            if ((d) > 0. && (p)->justify == RIGHT) \
              PUT_CHAR('+', p)

#define PUT_SPACE(d, p) \
            if ((p)->space == FOUND && (d) > 0.) \
              PUT_CHAR(' ', p)

/* pad right */
#define PAD_RIGHT(p) \
            if ((p)->width > 0 && (p)->justify != LEFT) \
              for (; (p)->width > 0; (p)->width--) \
                 PUT_CHAR((p)->pad, p)

/* pad left */
#define PAD_LEFT(p) \
            if ((p)->width > 0 && (p)->justify == LEFT) \
              for (; (p)->width > 0; (p)->width--) \
                 PUT_CHAR((p)->pad, p)

/* if width and prec. in the args */
#define STAR_ARGS(p) \
            if ((p)->star_w == FOUND) \
              (p)->width = va_arg(args, int); \
            if ((p)->star_p == FOUND) \
              (p)->precision = va_arg(args, int)