Package: manpages-dev
Version: 3.05-1
Severity: normal
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The basename (3) man page says that there are two different versions
of basename(): the POSIX one and the GNU version. This is
correct. However, it goes on to say that you get the GNU version with
#define _GNU_SOURCE
#include <string.h>
Confusingly, it also says (a little further down the page):
> With glibc, one gets the POSIX version of basename() when <libgen.h> is
> included, and the GNU version otherwise.
Both are actually incorrect. If you have a program with
> #include <stdio.h>
>
> int main(void)
> {
> char *p, *path = "/usr/nowhere/nothing";
>
> p = basename(path);
>
> return 0;
> }
and try to compile it, you'll get
> bt.c: In function 'main':
> bt.c:7: warning: assignment makes pointer from integer without a cast
(since basename hasn't been defined, its return type defaults to
'int').
Defining _GNU_SOURCE and including string.h, as the man page suggests,
makes no difference. In fact, /usr/include/string.h doesn't use
_GNU_SOURCE at all (though it does mention it in passing).
If you #define __USE_GNU instead, however, then basename() is defined
as the GNU version, and no compiler warnings result (the basename()
definition in string.h is contained in a "#ifdef __USE_GNU"
construct).
To be honest, I'm not sure whether this is a manpage error or a
glibc/header file error, but this seemed a good place to start.
Thanks,
.....Ron
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