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Bug 115453 - strtof is broken
strtof is broken
Product: Red Hat Enterprise Linux 2.1
Classification: Red Hat
Component: glibc (Show other bugs)
i686 Linux
high Severity high
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Assigned To: Jakub Jelinek
Brian Brock
Depends On:
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Reported: 2004-02-12 12:18 EST by Ragnar Hojland Espinosa
Modified: 2016-11-24 10:23 EST (History)
1 user (show)

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2004-02-13 07:27:21 EST
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Description Ragnar Hojland Espinosa 2004-02-12 12:18:54 EST
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040120

Description of problem:
#include <stdlib.h>
   printf ("%f\n", strtof ("+5.7344E+02", 0));
   return 0;

erroneously prints:

and worse,

#include <stdlib.h>
   char foo;
   printf ("%f\n", strtof ("+5.7344E+02", 0));
   return 0;


Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
compile above

Additional info:

No rpms have been updated; this bug is also present in more modern glibcs.
Comment 1 Jakub Jelinek 2004-02-13 07:27:21 EST
If you used -Wall option, GCC would tell you what's wrong:
/tmp/x.c:3: warning: return type defaults to `int'
/tmp/x.c: In function `main':
/tmp/x.c:4: warning: implicit declaration of function `printf'
/tmp/x.c:4: warning: implicit declaration of function `strtof'
/tmp/x.c:4: warning: double format, different type arg (arg 2)

The problem is that strtof, being ISO C99+ function, is not prototyped
in ISO C90 compilations, as that would violate namespace rules.
See info libc on Feature Set Macros.
Compiling with -std=c99, -std=gnu99, -D_GNU_SOURCE or -D_ISOC99_SOURCE
(and also #include <stdio.h> for printf while you're at it) will fix it up.

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