Bug#286659: marked as done (libc6-dev: strtof does not work, strtod works)
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and subject line Bug#286659: libc6-dev: strtof does not work, strtod works
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From: Igor Pesando <ipesando@to.infn.it>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: libc6-dev: strtof does not work, strtod works
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Date: Tue, 21 Dec 2004 11:53:27 +0100
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Package: libc6-dev
Version: 2.3.2.ds1-19
Severity: normal
-- System Information:
Debian Release: 3.1
APT prefers unstable
APT policy: (800, 'unstable')
Architecture: i386 (i686)
Kernel: Linux 2.4.24
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Versions of packages libc6-dev depends on:
ii libc6 2.3.2.ds1-19 GNU C Library: Shared libraries an
ii linux-kernel-headers 2.5.999-test7-bk-17 Linux Kernel Headers for developme
-- no debconf information
Try to run
#include <stdio.h>
#include <stdlib.h>
/**********************************************************************/
int main(){
float S0;
double S1;
char *s="12.3";
char *endp;
S0=strtof(s,&endp);
if( s == endp ) {
printf("NO conversion\n");
}
printf("S0=%f\n",(double) S0);
S1=strtod(s,&endp);
if( s == endp ) {
printf("NO conversion\n");
}
printf("S1=%f\n",S1);
return 0;
}
the output is
S0=4508877.000000
S1=12.300000
---------------------------------------
Received: (at 286659-done) by bugs.debian.org; 24 Dec 2004 01:39:34 +0000
>From gotom@debian.or.jp Thu Dec 23 17:39:34 2004
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Date: Fri, 24 Dec 2004 10:39:28 +0900
Message-ID: <81y8foscdr.wl@omega.webmasters.gr.jp>
From: GOTO Masanori <gotom@debian.or.jp>
To: "Adam D. Barratt" <debian-bts@adam-barratt.org.uk>,
286659-done@bugs.debian.org
Cc: "Igor Pesando" <ipesando@to.infn.it>
Subject: Re: Bug#286659: libc6-dev: strtof does not work, strtod works
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<[🔎] 0b4201c4e757$3e4e8200$eb00010a@andromeda>
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At Tue, 21 Dec 2004 12:18:56 -0000,
Adam D. Barratt <debian-bts@adam-barratt.org.uk> wrote:
> On Tuesday, December 21, 2004 10:53 AM, Igor Pesando <ipesando@to.infn.it>
> wrote:
>
> strtof() works fine, you've just missed a key note at the foot of strtof(3):
>
> CONFORMING TO
> ANSI C describes strtod, C99 describes the other two functions.
>
> By default, gcc will use `gnu89' (ISO C90 plus some GNU extensions) as the
> standard to compile against (see gcc(1)). Those extensions *don't* include
> strtof() or strtold().
>
> Compiling the provided sample with saner flags should have highlighted the
> fact that there was an issue:
>
> adam@kaa:~$ gcc -Wall -o 286659 286659.c
> 286659.c: In function `main':
> 286659.c:14: warning: implicit declaration of function `strtof'
>
> At this point, examining stdlib.h will show that the definition of strtof is
> wrapped in a `#ifdef __USE_ISOC99'. So...
>
> adam@kaa:~$ gcc -Wall -std=c99 -o 286659 286659.c
> adam@kaa:~$ ./286659
> S0=12.300000
> S1=12.300000
>
> IMHO, this bug should be closed as due to user error.
It's nice explanation and examples. I close this bug.
Regards,
-- gotom
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