Include stdlib.h and unistd.h if available.
Include xalloc.h.
(xmalloc, xstrdup, free): Remove decls.
(xgetcwd): Don't assume sizes fit in unsigned.
Check for overflow when computing sizes.
Simplify reallocation code.
Also, make the following further changes to make this file's
configuration more similar to that of strtol.c:
(UNSIGNED): Renamed from STRTOUXMAX_UNSIGNED. All uses changed.
(strtoumax, uintmax_t, strtoull, strtol): Remove.
(intmax_t, strtoimax, strtol, strtoll): New macros, if UNSIGNED.
(strtoimax): Renamed from strtoumax. All uses of unsigned values
changed to signed values.
And make the following changes as well:
Fix copyright notice, as 1999 was missing.
(verify): New macro.
(strtoimax): Check sizes at compile-time, not run-time.
Prefer strtol to strtoll if both work.
(main): Remove; it was not that useful and was a pain to maintain.
exists and anyway it was so heavily changed from the old cccp
code as to be unrecognizable. Include full-write.h.
(full_write) Return size_t, with short writes meaning failure.
All callers changed. This fixes a bug with large buffers
on 64-bit hosts.
(free_exclude): New decl.
(add_exclude, add_exclude_file): Now takes int options arg.
(excluded_filename): No longer requires options arg, as the options
are determined by add_exclude. Now returns bool, not int.
This fixes one or two unlikely storage allocation overflow bugs,
but doesn't change user-visible behavior otherwise.
(bool): Declare, perhaps by including stdbool.h.
(<sys/types.h>): Include only if HAVE_SYS_TYPES_H.
(<stdlib.h>, <string.h>, <strings.h>, <inttypes.h>, <stdint.h>):
Include if available.
(<xalloc.h>): Include
(SIZE_MAX): Define if <stdint.h> or <inttypes.h> doesn't.
(verify): New macro. Use it to verify that EXCLUDE macros do not
collide with FNM macros.
(struct patopts): New struct.
(struct exclude): Use it, as exclude patterns now come with options.
(new_exclude): Support above changes.
(new_exclude, add_exclude_file):
Initial size must now be a power of two to simplify overflow checking.
(free_exclude, fnmatch_no_wildcards): New function.
(excluded_filename): No longer requires options arg, as the options
are determined by add_exclude. Now returns bool, not int.
(excluded_filename, add_exclude):
Add support for the fancy new exclusion options.
(add_exclude, add_exclude_file): Now takes int options arg.
Check for arithmetic overflow when computing sizes.
(add_exclude_file): xrealloc might modify errno, so don't
realloc until after errno might be used.
