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#ifndef lint
static char *RCSid = "$Id: cmath.c,v 1.9 1993/02/09 17:56:15 anders Exp anders $";
#endif
/*
* The Regina Rexx Interpreter
* Copyright (C) 1992-1994 Anders Christensen <anders@pvv.unit.no>
*
* This library 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 library 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 library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* More attention should be paid to overflow and underflow conditions.
* This *is* done in some of the routines for the GCC compiler, but should
* be done in an ANSI-compatible manner.
*/
#include "rexx.h"
#include <math.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#ifdef SunKludges
extern double strtod( const char *, char ** ) ;
#endif
double myatof( streng *string )
{
char *ptr=NULL ;
double answer=0 ;
#if 0
extern int minus_zero ;
#endif
string = Str_ify(Str_dup(string)) ;
answer = strtod(string->value,&ptr) ;
for (;(*ptr)&&(isspace(*ptr));ptr++) ;
#ifdef SUNOS_STRTOD_BUG
for (;*ptr=='0';ptr++) ;
#endif /* SUNOS_STRTOD_BUG */
if (*ptr)
exiterror( ERR_BAD_ARITHMETIC, 0 ) ;
Free_string( string ) ;
/* only for special machines */
#if 0
if (answer == minus_zero)
answer = 0 ;
#endif
return answer ;
}
int myisnumber( streng *string )
{
register char *ptr=NULL, *eptr=NULL ;
int num=0 ;
if (!string->len)
return 0 ;
ptr = string->value ;
eptr = Str_end( string ) ;
for (; (ptr<eptr) && (isspace(*ptr)); ptr++) ;
if ((ptr<eptr) && ((*ptr=='-') || (*ptr=='+')))
for (ptr++; (ptr<eptr) && (isspace(*ptr)); ptr++) ;
for (; (ptr<eptr) && isdigit(*ptr); ptr++, num++) ;
if ((ptr<eptr) && *ptr=='.')
for (ptr++;(ptr<eptr) && isdigit(*ptr); ptr++, num++) ;
if (!num)
return 0 ;
if ((ptr<eptr) && ((*ptr=='e') || (*ptr=='E')))
{
ptr++ ;
num = 0 ;
if ((ptr<eptr) && ((*ptr=='-') || (*ptr=='+')))
ptr++ ;
for (; (ptr<eptr) && isdigit(*ptr); ptr++, num++ ) ;
if (!num)
return 0 ;
}
for (; (ptr<eptr) && (isspace(*ptr)); ptr++) ;
return (ptr==eptr) ;
}
/*
* Takes 'string' as parameter, analyze whether it is an integer, and
* return a boolean variable which is true iff 'string' is a legal
* integer. The format of a legal integer is (the regexpr):
* [ ]*([-+][ ]*)?[0-9]+[ ]*
*/
int myisinteger( streng *string )
{
char *cptr=NULL, *eptr=NULL ;
cptr = string->value ;
eptr = cptr + string->len ;
for (;cptr<eptr && isspace(*cptr); cptr++) ;
if (cptr<eptr && (*cptr=='-' || *cptr=='+'))
for (cptr++; cptr<eptr && isspace(*cptr); cptr++) ;
if (cptr>=eptr)
return 0 ;
for (;cptr<eptr && isdigit(*cptr); cptr++) ;
for (;cptr<eptr && isspace(*cptr); cptr++) ;
return (cptr==eptr) ;
}
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