* m4/stdlib_h.m4 (gl_STDLIB_H_DEFAULTS): Initialize HAVE_DECL_INITSTATE,
HAVE_DECL_SETSTATE.
* m4/random.m4 (gl_FUNC_RANDOM): Test whether initstate and setstate are
declared.
* modules/stdlib (Makefile.am): Substitute HAVE_DECL_INITSTATE,
HAVE_DECL_SETSTATE.
* lib/stdlib.in.h (initstate): Declare also if HAVE_DECL_INITSTATE is 0.
(setstate): Declare also if HAVE_DECL_SETSTATE is 0.
* doc/posix-functions/initstate.texi: Mention the Cygwin 1.5.x problem.
* doc/posix-functions/random.texi: Likewise.
* doc/posix-functions/setstate.texi: Likewise.
* doc/posix-functions/srandom.texi: Likewise.

reallocarray is a new function in glibc 2.26 to safely allocate an array
of memory locations with integer overflow protection.
* MODULES.html.sh: Add reallocarray.
* doc/glibc-functions/reallocarray.texi: Documentation for reallocarray.
* lib/reallocarray.c: New file to implement module reallocarray.
* lib/stdlib.in.h: Add function declarations for reallocarray.
* m4/reallocarray.m4: New file.
* m4/stdlib_h.m4: Declare reallocarray.
* modules/reallocarray: New file.
* modules/reallocarray-test: New file.
* modules/stdlib: Coerce stdlib.h to export reallocarray.
* tests/test-reallocarray.c: New test.

* m4/stdlib_h.m4 (gl_STDLIB_H): Check for qsort_r.
(gl_STDLIB_H_DEFAULTS): Initialize HAVE_QSORT_R.
* modules/stdlib (Makefile.am): Substitute HAVE_QSORT_R.
* lib/stdlib.in.h (qsort_r): Provide declaration if the function does
not exist.
* m4/qsort_r.m4 (gl_FUNC_QSORT_R): Use AC_CHECK_FUNCS to test whether
the function exists.
* modules/qsort_r: Add comments.

This works even on FreeBSD, which has an incompatible qsort_r API.
* MODULES.html.sh: Add it.
* doc/glibc-functions/qsort_r.texi: It's now supported.
* lib/qsort.c: New file, taken from glibc with minor changes
inside "#ifndef _LIBC" and with an unnecessary "#include <alloca.h>"
removed.
* lib/qsort_r.c: New file, compiled only on FreeBSD.
* lib/stdlib.in.h (qsort_r): Declare in the usual way.
* m4/stdlib_h.m4 (gl_STDLIB_H_DEFAULTS):
* modules/qsort_r, modules/qsort_r-tests: New files.
* modules/stdlib (Makefile): Set up its defaults.
* tests/test-qsort_r.c: New file.

* MODULES.html.sh (Extra functions based on ANSI C 89):
Add secure_getenv.
* doc/glibc-functions/secure_getenv.texi: New file.
* doc/gnulib.texi: Include it.
* lib/secure_getenv.c, m4/secure_getenv.m4, modules/secure_getenv:
New files.
* lib/stdlib.in.h (secure_getenv): New decl.
* m4/stdlib_h.m4 (gl_STDLIB_H, gl_STDLIB_H_DEFAULTS):
* modules/stdlib (stdlib.h):
Add secure_getenv checks.

POSIX left errno undefined on ptsname() failure, although there
has at least been an effort to specify reasonable values to use:
http://www.austingroupbugs.net/view.php?id=503

However, our tests for ptsname and ptsname_r already require errno
to be set to useful values (as in glibc), so it is worth replacing
ptsname on FreeBSD 8.2 in order to get better QoI and pass the test.

* m4/ptsname.m4 (gl_FUNC_PTSNAME): Probe for FreeBSD bug.
* m4/stdlib_h.m4 (gl_STDLIB_H_DEFAULTS): Add new witness.
* modules/stdlib (Makefile.am): Replace witness.
* lib/stdlib.in.h (ptsname): Allow for replacement.
* modules/ptsname (configure.ac): Trigger replacement.
* doc/posix-functions/ptsname.texi (ptsname): Document this.

* lib/stdlib.in.h (random, srandom, initstate, setstate): New
declarations.
* lib/random.c: New file, based on glibc/stdlib/random.c.
* m4/random.m4: New file.
* m4/stdlib_h.m4 (gl_STDLIB_H_DEFAULTS): Initialize GNULIB_RANDOM,
HAVE_RANDOM.
* modules/stdlib (Makefile.am): Substitute GNULIB_RANDOM, HAVE_RANDOM.
* modules/random: New file.
* config/srclist.txt: Add an entry for random.c.
* doc/posix-functions/random.texi: Mention the 'random' module.
* doc/posix-functions/initstate.texi: Likewise.
* doc/posix-functions/setstate.texi: Likewise.
* doc/posix-functions/srandom.texi: Likewise.

* lib/stdlib.in.h (random_r, srandom_r, initstate_r, setstate_r):
Override the system function if REPLACE_RANDOM_R is 1.
* m4/random_r.m4 (gl_FUNC_RANDOM_R): Require AC_CANONICAL_HOST. On AIX
and OSF/1, set REPLACE_RANDOM_R.
* m4/stdlib_h.m4 (gl_STDLIB_H_DEFAULTS): Initialize REPLACE_RANDOM_R.
* modules/stdlib (Makefile.am): Substitute REPLACE_RANDOM_R.
* modules/random_r (configure.ac): Test REPLACE_RANDOM_R.
* doc/glibc-functions/initstate_r.texi: Mention the AIX, OSF/1 problem.
* doc/glibc-functions/random_r.texi: Likewise.
* doc/glibc-functions/setstate_r.texi: Likewise.

* lib/stdlib.in.h (ptsname_r): Override if REPLACE_PTSNAME_R is 1.
* m4/stdlib_h.m4 (gl_STDLIB_H_DEFAULTS): Initialize REPLACE_PTSNAME_R.
* m4/ptsname_r.m4 (gl_FUNC_PTSNAME_R): Set REPLACE_PTSNAME_R if the
function is not declared or incompatibly declared.
* modules/stdlib (Makefile.am): Substitute REPLACE_PTSNAME_R.
* modules/ptsname_r (Depends-on, configure.ac): Update.
* doc/glibc-functions/ptsname_r.texi: Mention the OSF/1 problems.

For now, this replacement focuses solely on compilation
compatibility, and assumes that isatty() and ttyname_r() work
on a master side pty; if this assumption fails, or if
thread-safety is also required, then a later patch can follow
the lead of strerror_r.c in wrapping the system ptsname()
with a lock.

* modules/ptsname_r: New module.
* m4/ptsname_r.m4 (gl_FUNC_PTSNAME_R): New file.
* lib/ptsname.c (__ptsname_r): Split...
* lib/ptsname_r.c: ...into new file.
* m4/stdlib_h.m4 (gl_STDLIB_H): Check for decl.
(gl_STDLIB_H_DEFAULTS): Set witness defaults.
* modules/stdlib (Makefile.am): Substitute witnesses.
* lib/stdlib.in.h (ptsname_r): Declare it.
* doc/glibc-functions/ptsname_r.texi (ptsname_r): Document it.
* MODULES.html.sh (Misc): Likewise.
* modules/ptsname (Depends-on): Alter dependency.
* doc/posix-functions/ptsname.texi (ptsname): Mention new module.

Signed-off-by: Eric Blake <eblake@redhat.com>