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/*
*
* This file is part of the XForms library package.
*
* XForms is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1, or
* (at your option) any later version.
*
* XForms 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with XForms; see the file COPYING. If not, write to
* the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*
*/
/*
* $Id: n2a.c,v 0.80 1994/02/24 09:48:11 zhao Exp $
*
*. Copyright(c) 1993,1994 by T.C. Zhao
* All rights reserved.
*.
*
* Convert numbers to strings. Not the fastest but faster than sprintf.
* Useful in monitoring situations.
*
* Converted strings are in a static buffer.
*
* On IRIX 3.3, itoa is about 3 times faster than sprintf
* ftoa is about 4 times (6digits)faster than sprintf
*/
#if !defined(lint) && defined(F_ID)
char *id_n2a = "$Id: n2a.c,v 0.80 1994/02/24 09:48:11 zhao Exp $";
#endif
#include <stdio.h>
#include <string.h>
#include "forms.h"
#include "ulib.h"
static const char *digits = "0123456789";
/************* convert integer to string **********/
const char *
fl_itoa(register int n)
{
static char buf[20];
register char *p = buf + sizeof(buf);
register int l, sign = 0;
if (n < 0)
{
sign = '-';
n = -n; /* might overflow if n most negative */
}
*--p = '\0'; /* terminating 0 */
while (n >= 10)
{
*--p = *(digits + (n - (l = n / 10) * 10));
n = l;
}
*--p = *(digits + n);
if (sign)
*--p = sign;
return p;
}
/******* convert float to a string. Max keep 6 digits *****/
static int multab[] =
{
1, 10, 100, 1000, 10000, 100000, 1000000, 10000000
};
const char *
fl_ftoa(float f, int n)
{
static char buf[33];
register char *fbuf;
static int nmax = sizeof(multab) / sizeof(multab[0]);
int i, sign = 0;
register float ff;
register int fi, ffi, l;
#if 1
if (n >= nmax || n < 0)
n = nmax - 1;
if (f < 0)
{
f = -f;
sign = '-';
}
f += 0.05 / multab[n]; /* rounding */
fi = f;
ff = f - fi;
*(fbuf = buf + n + 2) = '.';
if (ff < 1.0 / multab[n])
{
*++fbuf = '0';
}
else
{
for (i = 1; i <= n; i++)
{
*++fbuf = *(digits + (ffi = (ff *= 10.0)));
ff = ff - ffi;
}
}
*++fbuf = '\0';
/* covert the interal part */
fbuf = buf + n + 2;
while (fi >= 10)
{
*--fbuf = *(digits + (fi - (l = fi / 10) * 10));
fi = l;
}
*--fbuf = *(digits + fi);
if (sign)
*--fbuf = sign;
return fbuf;
#else
sprintf(buf, "%.*f", n, f);
return buf;
#endif
}
#ifdef TEST
#include <stdio.h>
main()
{
static int nn[] =
{0, 1, 5, -1, -10, 1234567, -121};
static float ff[] =
{1.2, -2.1, 0.01, 0.001, 1.00, -123456.252, 1.23552};
int j;
for (j = 0; j < sizeof(nn) / sizeof(nn[0]); j++)
fprintf(stderr, "itoa(%d)=%s\n", nn[j], itoa(nn[j]));
for (j = 0; j < sizeof(ff) / sizeof(ff[0]); j++)
fprintf(stderr, "ftoa(%f, %d)=%s\n", ff[j], j, ftoa(ff[j], j));
}
#endif
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