Fix undefined behaviour. * lib/bitrotate.h (rotl16, rotr16, rotl8, rotr8): Case x to 'unsigned int', to avoid shift operations on 'int'. * lib/xmemdup0.c (xmemdup0): Don't invoke memcpy with a zero size. * tests/test-count-leading-zeros.c (main): Use a random number that has as many bits as TYPE, not only 2*15 or 2*31 bits. * tests/test-count-trailing-zeros.c (main): Likewise. * tests/test-count-one-bits.c (main): Likewise. * tests/test-memmem.c: Don't include "null-ptr.h". (main): Use zerosize_ptr() instead of null_ptr(). * modules/memmem-tests (Files): Remove tests/null-ptr.h.

Description:
File descriptor functions that avoid clobbering STD{IN,OUT,ERR}_FILENO.

Files:
lib/unistd--.h
lib/dup-safer.c
lib/fd-safer.c
lib/pipe-safer.c
lib/unistd-safer.h
m4/unistd-safer.m4

Depends-on:
fcntl
unistd

configure.ac:
gl_UNISTD_SAFER

Makefile.am:
lib_SOURCES += dup-safer.c fd-safer.c pipe-safer.c

Include:
"unistd-safer.h"

License:
GPL

Maintainer:
Paul Eggert, Jim Meyering