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/* dtoa.cc convert double to ascii and visa versa.
Copyright (C) 2009-2022 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
This file is part of GNU Modula-2.
GNU Modula-2 is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Modula-2 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
General Public License for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#define GM2
#include <config.h>
#include <m2rts.h>
#if defined(HAVE_STRINGS)
#include <strings.h>
#endif
#if defined(HAVE_STRING)
#include <string.h>
#endif
#if defined(HAVE_STDDEF_H)
/* Obtain a definition for NULL. */
#include <stddef.h>
#endif
#if defined(HAVE_STDIO_H)
/* Obtain a definition for NULL. */
#include <stdio.h>
#endif
#if defined(HAVE_TIME_H)
/* Obtain a definition for NULL. */
#include <time.h>
#endif
#if defined(HAVE_STRING_H)
/* Obtain a definition for NULL. */
#include <string.h>
#endif
#if defined(HAVE_WCHAR_H)
/* Obtain a definition for NULL. */
#include <wchar.h>
#endif
#if defined(HAVE_STDLIB_H)
/* Obtain a prototype for free and malloc. */
#include <stdlib.h>
#endif
#if !defined(NULL)
#define NULL (void *)0
#endif
#if !defined(TRUE)
#define TRUE (1 == 1)
#endif
#if !defined(FALSE)
#define FALSE (1 == 0)
#endif
#if defined(HAVE_STDLIB_H)
#if !defined(_ISOC99_SOURCE)
#define _ISOC99_SOURCE
#endif
#include <stdlib.h>
#endif
#if defined(HAVE_ERRNO_H)
#include <errno.h>
#endif
#if defined(HAVE_SYS_ERRNO_H)
#include <sys/errno.h>
#endif
#if defined(HAVE_STRING_H)
#define MAX_FP_DIGITS 500
typedef enum Mode { maxsignicant, decimaldigits } Mode;
/* maxsignicant: return a string containing max(1,ndigits) significant
digits. The return string contains the string produced by ecvt.
decimaldigits: return a string produced by fcvt. The string will
contain ndigits past the decimal point (ndigits may be negative). */
extern "C" double
dtoa_strtod (const char *s, int *error)
{
char *endp;
double d;
#if defined(HAVE_ERRNO_H)
errno = 0;
#endif
d = strtod (s, &endp);
if (endp != NULL && (*endp == '\0'))
#if defined(HAVE_ERRNO_H)
*error = (errno != 0);
#else
*error = FALSE;
#endif
else
*error = TRUE;
return d;
}
/* dtoa_calcmaxsig calculates the position of the decimal point
it also removes the decimal point and exponent from string, p. */
extern "C" int
dtoa_calcmaxsig (char *p, int ndigits)
{
char *e;
char *o;
int x;
e = strchr (p, 'E');
if (e == NULL)
x = 0;
else
{
*e = (char)0;
x = atoi (e + 1);
}
o = strchr (p, '.');
if (o == NULL)
return strlen (p) + x;
else
{
memmove (o, o + 1, ndigits - (o - p));
return o - p + x;
}
}
/* dtoa_calcdecimal calculates the position of the decimal point
it also removes the decimal point and exponent from string, p.
It truncates the digits in p accordingly to ndigits.
Ie ndigits is the number of digits after the '.'. */
extern "C" int
dtoa_calcdecimal (char *p, int str_size, int ndigits)
{
char *e;
char *o;
int x;
int l;
e = strchr (p, 'E');
if (e == NULL)
x = 0;
else
{
*e = (char)0;
x = atoi (e + 1);
}
l = strlen (p);
o = strchr (p, '.');
if (o == NULL)
x += strlen (p);
else
{
int m = strlen (o);
memmove (o, o + 1, l - (o - p));
if (m > 0)
o[m - 1] = '0';
x += o - p;
}
if ((x + ndigits >= 0) && (x + ndigits < str_size))
p[x + ndigits] = (char)0;
return x;
}
extern "C" int
dtoa_calcsign (char *p, int str_size)
{
if (p[0] == '-')
{
memmove (p, p + 1, str_size - 1);
return TRUE;
}
else
return FALSE;
}
extern "C" char *
dtoa_dtoa (double d, int mode, int ndigits, int *decpt, int *sign)
{
char format[50];
char *p;
int r;
switch (mode)
{
case maxsignicant:
ndigits += 20; /* Enough for exponent. */
p = (char *) malloc (ndigits);
snprintf (format, 50, "%s%d%s", "%.", ndigits - 20, "E");
snprintf (p, ndigits, format, d);
*sign = dtoa_calcsign (p, ndigits);
*decpt = dtoa_calcmaxsig (p, ndigits);
return p;
case decimaldigits:
p = (char *) malloc (MAX_FP_DIGITS + 20);
snprintf (format, 50, "%s%d%s", "%.", MAX_FP_DIGITS, "E");
snprintf (p, MAX_FP_DIGITS + 20, format, d);
*sign = dtoa_calcsign (p, MAX_FP_DIGITS + 20);
*decpt = dtoa_calcdecimal (p, MAX_FP_DIGITS + 20, ndigits);
return p;
default:
abort ();
}
}
#endif
#if defined(GM2)
/* GNU Modula-2 linking hooks. */
extern "C" void
_M2_dtoa_init (int, char **, char **)
{
}
extern "C" void
_M2_dtoa_fini (int, char **, char **)
{
}
extern "C" void
_M2_dtoa_dep (void)
{
}
extern "C" void __attribute__((__constructor__))
_M2_dtoa_ctor (void)
{
M2RTS_RegisterModule ("dtoa", _M2_dtoa_init, _M2_dtoa_fini,
_M2_dtoa_dep);
}
#endif
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