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Bug 77246 - isblank() not properly prototyped in /usr/include/ctype.h
isblank() not properly prototyped in /usr/include/ctype.h
Product: Red Hat Linux
Classification: Retired
Component: glibc (Show other bugs)
i386 Linux
medium Severity medium
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Assigned To: Jakub Jelinek
Brian Brock
Depends On:
  Show dependency treegraph
Reported: 2002-11-04 01:41 EST by greg hosler
Modified: 2016-11-24 10:18 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: 2002-11-04 01:41:27 EST
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RHEL 7.3 requirements from Atomic Host:
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Description greg hosler 2002-11-04 01:41:21 EST
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.1) Gecko/20021003

Description of problem:
man isblank, gives usage or "isblank()", yet the following program
yields at error when compiled (warning actually, but it shouldn't).

#include <ctype.h>
int main()
        char a;
        int i = isblank(a);

# gcc -Wall -o fooey foo.c
foo.c: In function `main':
foo.c:5: warning: implicit declaration of function `isblank'

Note: isblank() should NOT be seen by the compiler as "implicitly defined"

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

How reproducible:

Steps to Reproduce:
1. See sample code snippet above

Actual Results:  erroneous warning message. Note that w/o proper prototyping,
time argument mismatches would be properly converted to correct argument type.

Expected Results:  no warning message.

Additional info:

This same bug existed in Red Hat 7.3
Comment 1 Jakub Jelinek 2002-11-04 04:05:45 EST
Please RTFM info libc about feature set macros.
isblank is only specified in ISO C99, so you either get it when compiling
with -std=c99, -std=gnu99 or -D_ISOC99_SOURCE.

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