Re: port-sparc/44389

[Mateusz Loskot <mateusz%loskot.net@localhost>]

The following reply was made to PR port-sparc/44389; it has been noted by GNATS.

From: Mateusz Loskot <mateusz%loskot.net@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: Martin Husemann <martin%duskware.de@localhost>, 
 port-sparc-maintainer%netbsd.org@localhost, gnats-admin%netbsd.org@localhost, 
 netbsd-bugs%netbsd.org@localhost
Subject: Re: port-sparc/44389
Date: Tue, 18 Jan 2011 15:00:42 +0000

 On 18/01/11 13:35, Martin Husemann wrote:
 > The following reply was made to PR port-sparc/44389; it has been noted by 
 > GNATS.
 >
 > From: Martin Husemann<martin%duskware.de@localhost>
 > To: gnats-bugs%NetBSD.org@localhost
 > Cc:
 > Subject: Re: port-sparc/44389
 > Date: Tue, 18 Jan 2011 14:30:09 +0100
 >
 >   Ok - last try - check the output of this one.
 >
 >   Martin
 >
 >   #include<stdio.h>
 >   #include<stdlib.h>
 >   #include<math.h>
 >   #include<errno.h>
 >
 >   int is_number(const char *s)
 >   {
 >      double r;
 >      char *ep;
 >      errno = 0;
 >      r = strtod(s,&ep);
 >      if (ep == s || r == HUGE_VAL || errno == ERANGE)
 >              return 0;
 >      while (*ep == ' ' || *ep == '\t' || *ep == '\n')
 >              ep++;
 >      if (*ep == '\0')
 >              return 1;
 >      else
 >              return 0;
 >   }
 >
 >   int main(int argc, char **argv)
 >   {
 >      double v;
 >
 >      if (is_number("NaN")) {
 >              printf("is a number\n");
 >              v = atof("NaN");
 >      } else {
 >              printf("not a number\n");
 >              v = 0.0;
 >      }
 >      printf("%.4f\n", v);
 >
 >      return 0;
 >   }
 
 
 This one receive SIGFPE:
 
 $ gcc ./nan_test_2.c
 $ ./a.out
 [1]   Floating point exception (core dumped) ./a.out
 
 Specifically, it's caused by r == HUGE_VAL condition in
 if (ep == s || r == HUGE_VAL || errno == ERANGE)
 
 Though, not sure about conclusion.
 
 -- 
 Mateusz Loskot, http://mateusz.loskot.net
 Charter Member of OSGeo, http://osgeo.org
 Member of ACCU, http://accu.org