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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: alainm@rcsm.ee.mcgill.ca
*/
#ifndef HAVE_VSNPRINTF
RCSIDH(snprintf_h, "$Id$")
#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif
#include <stdlib.h> /* for atoi() */
#include <ctype.h>
#define PRIVATE static
#define PUBLIC
/*
* 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__
char const *pf;
#else
char *pf;
#endif
/* FLAGS */
int width, precision;
int justify; char pad;
int square, space, star_w, star_p, a_long, a_longlong;
};
/* 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)
#endif /* HAVE_VSNPRINTF */
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