Re: memmem(3)

[Andreas Westfeld <andreas.westfeld@xxxxxxxxxxxxxx>]

No, please ignore, I did not get that I also have to include 
<features.h> in order to define __USE_GNU via _GNU_SOURCE:

#ifdef  _GNU_SOURCE
# define __USE_GNU      1
#endif

Andreas

On 09.01.19 20:07, Andreas Westfeld wrote:
> > SYNOPSIS
> >        #define _GNU_SOURCE         /* See feature_test_macros(7) */
> >        #include <string.h>
>
> should be
>
> SYNOPSIS
>        #define __USE_GNU         /* See feature_test_macros(7) */
>        #include <string.h>
>
> because <string.h> needs it for declaring memmem ... (see below). The 
> same symbol replacement is necessary in man 3 mempcpy, strfry, 
> memfrob, memchr and probably others.
>
> Andreas
>
> #ifdef __USE_GNU
> /* Find the first occurrence of NEEDLE in HAYSTACK.
>    NEEDLE is NEEDLELEN bytes long;
>    HAYSTACK is HAYSTACKLEN bytes long.  */
> extern void *memmem (const void *__haystack, size_t __haystacklen,
>                      const void *__needle, size_t __needlelen)
>      __THROW __attribute_pure__ __nonnull ((1, 3));
> [...]
--
Andreas Westfeld, 0432 01CC F511 9E2B 0B57 5993 0B22 98F8 4AD8 EEEA
HTW Dresden, Fakultät Informatik/Mathematik
Informatikrecht/Informationssicherheit, Zimmer Z 337
Tel. +49-351-462-3372, http://www.htw-dresden.de/~westfeld

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