(<error.h>): Do not include.
(unicode_to_mb): Return int, not void. New arg for failure callback.
Invoke the failure callback instead of invoking 'error'.
(print_unicode_success): Renamed from fprintf_callback. Now extern.
Return -1 on failure, 0 on success.
(print_unicode_failure): New function.
(print_unicode_char): Return int. Adjust to changes to unicode_to_mb.
Do not report error: instead, print an approximation.
(strtoimax): Guard declaration with
`#if !HAVE_DECL_STRTOIMAX', rather than just `#ifndef strtoimax'.
The latter fails because some systems (at least rs6000-ibm-aix4.3.3.0)
have their own, conflicting declaration of strtoimax in sys/inttypes.h.
(strtoumax): Likewise, for completeness (it wasn't necessary).
(UNSIGNED): Renamed from STRTOUXMAX_UNSIGNED.
(verify): New macro.
(INT): Renamed from uintmax_t.
(strtoumax, strtoull, strtoul): Remove.
(strtoimax, strtol, strtoll): New macros.
(strtoimax): Renamed from strtoumax. Interchange signed with unsigned.
Verify sizes at compile-time, not at run-time.
Prefer strtol to strtoll if both work.
(main): Remove.
(<stdlib.h>, <unistd.h>): Include if available.
("xalloc.h"): Include.
(xmalloc, xstrdup, free): Remove decls; no longer needed.
(xgetcwd): Don't assume sizes fit in 'unsigned'.
Check for overflow when path size gets too large.
Simplify failure code.
(NAMLEN): Remove macro.
(malloc, realloc): Remove decls.
(stpcpy): Likewise.
("xalloc.h"): Include.
(NAME_SIZE_DEFAULT): New macro.
(savedir): Use xmalloc / xrealloc to allocate memory.
Use NAME_SIZE_DEFAULT if name_size is negative or overflows to zero.
Skip "" directory entries.
Use strlen to calculate directory entry length, since the old method
is rarely used these days and isn't worth supporting.
Check for integer overflow when calculating allocation size.
Use memcpy to copy entries, instead of stpcpy.
Set errno properly when returning NULL.
Check for readdir error.
