Prefer idx_t to size_t in lib/cmpbuf.c and related buffer-size code.
Because POSIX says blksize_t can be wider than idx_t,
check for overflow when copying the former to the latter.
* bootstrap.conf (gnulib_modules): Add idx.
* lib/cmpbuf.c (block_read, buffer_lcm):
Prefer idx_t to size_t. All uses changed.
* lib/cmpbuf.c (block_read): Return ptrdiff_t instead of size_t.
All uses changed.
(buffer_lcm): Help the compiler by checking for negative args,
even though they are not allowed.
* lib/cmpbuf.h: Include idx.h and stddef.h, for idx_t and ptrdiff_t,
so that this include file is self-contained.
* src/analyze.c (diff_2_files):
* src/cmp.c (main):
* src/diff.c, src/io.c: Do not include stdckdint.h here,
since system.h now does that.
* src/diff3.c (read_diff):
* src/io.c (sip):
Protect against negative STAT_BLOCKSIZE, or STAT_BLOCKSIZE
outside idx_t range.
* src/system.h: Include stdckdint.h, idx.h.
Run "make update-copyright" and then...
* gnulib: Update to latest with copyright year adjusted.
* tests/init.sh: Sync with gnulib to pick up copyright year.
* bootstrap: Likewise.
Run "make update-copyright" and then...
* gnulib: Update to latest with copyright year adjusted.
* tests/init.sh: Sync with gnulib to pick up copyright year.
* bootstrap: Likewise.
* tests/binary: Reverse arguments to compare to avoid failure of
new syntax-check rule.
* configure.ac: Use -Wno-format-nonliteral.
Mark functions as pure of const, per recommendations enabled by
new gcc -W options. Use _GL_ATTRIBUTE_PURE and _GL_ATTRIBUTE_CONST.
* lib/cmpbuf.h (buffer_lcm, block_compare):
Apply pure and/or const attributes.
* src/cmp.c (block_compare): Likewise.
* src/context.c (find_hunk): Likewise.
* src/diff.h (lines_differ): Likewise.
* src/diff3.c (skipwhite): Likewise.
* src/dir.c (dir_loop): Likewise.
* src/util.c (find_change, find_reverse_change): Likewise.
(translate_line_number): Likewise.
