85 lines
1.7 KiB
C
85 lines
1.7 KiB
C
/****************************************************************
|
|
* *
|
|
* Copyright 2001, 2011 Fidelity Information Services, Inc *
|
|
* *
|
|
* This source code contains the intellectual property *
|
|
* of its copyright holder(s), and is made available *
|
|
* under a license. If you do not know the terms of *
|
|
* the license, please stop and do not read further. *
|
|
* *
|
|
****************************************************************/
|
|
|
|
#include "mdef.h"
|
|
|
|
#include "arit.h"
|
|
|
|
int val_iscan(mval *v)
|
|
{
|
|
boolean_t dot;
|
|
char *c, *eos;
|
|
int4 zeroes, sigdigs, exp;
|
|
|
|
MV_FORCE_STR(v);
|
|
c = v->str.addr;
|
|
if (0 == v->str.len)
|
|
return FALSE;
|
|
else if ((1 == v->str.len) && ('0' == *c))
|
|
return TRUE;
|
|
eos = c + v->str.len;
|
|
zeroes = sigdigs = exp = 0;
|
|
if ('-' == *c)
|
|
{
|
|
c++;
|
|
if (c == eos)
|
|
return FALSE;
|
|
}
|
|
dot = FALSE;
|
|
if (('9' >= *c) && ('0' < *c))
|
|
{
|
|
while ((c != eos) && ('9' >= *c) && ('0' <= *c))
|
|
{
|
|
if ('0' == *c) /* don't count trailing zeroes on a big number */
|
|
zeroes++;
|
|
else
|
|
zeroes = 0;
|
|
sigdigs++;
|
|
exp++;
|
|
c++ ;
|
|
}
|
|
if ((c != eos) && ('.' == *c))
|
|
{
|
|
dot = TRUE;
|
|
c++;
|
|
while ((c != eos) && ('9' >= *c) && ('0' <= *c))
|
|
{
|
|
if ('0' == *c) /* don't count trailing zeroes on a big number */
|
|
zeroes++;
|
|
else
|
|
zeroes = 0;
|
|
sigdigs++;
|
|
c++;
|
|
}
|
|
}
|
|
sigdigs -= zeroes;
|
|
} else if ('.' == *c)
|
|
{
|
|
dot = TRUE; c++;
|
|
while ((c != eos) && ('0' == *c))
|
|
{
|
|
exp--;
|
|
c++;
|
|
}
|
|
while ((c != eos) && ('9' >= *c) && ('0' <= *c))
|
|
{
|
|
sigdigs++;
|
|
c++;
|
|
}
|
|
} else
|
|
return FALSE;
|
|
exp += MV_XBIAS;
|
|
if ((c != eos) || (dot && (('0' == *(c - 1)) || ('.' == *(c - 1))))
|
|
|| (NUM_DEC_DG_2L < sigdigs) || (EXPLO > exp) || (EXPHI <= exp))
|
|
return FALSE;
|
|
return TRUE;
|
|
}
|