tree-wide: remove Emacs lines from all files This should be handled fine now by .dir-locals.el, so need to carry that stuff in every file.

utf8.[ch] et al: use char32_t and char16_t instead of int, int32_t, int16_t rework C11 utf8.[ch] to use char32_t instead of uint32_t when referring to unicode chars, to make things more expressive. [ @zonque: * rebased to current master * use AC_CHECK_DECLS to detect availibility of char{16,32}_t * make utf8_encoded_to_unichar() return int ]

basic/escape: merge utf8 and non-utf8 paths in cunescape_one Not every byte sequence is valid utf8. We allow escaping of non-utf8 sequences in strings by using octal and hexadecimal escape sequences (\123 and \0xAB) for bytes at or above 128. Users of cunescape_one could infer whether such use occured when they received an answer between 128 and 256 in *ret (a non-ascii one byte character). But this is subtle and misleading: the comments were wrong, because ascii is a subset of unicode, so c != 0 did not mean non-unicode, but rather ascii-subset-of-unicode-or-raw-byte. This was all rather confusing, so make the "single byte" condition explicit. I'm not convinced that allowing non-utf8 sequences to be produced is useful in all cases where we allow it (e.g. in config files), but that behaviour is unchanged, just made more explicit. This also fixes an (invalid) gcc warning about unitialized variable (*ret_unicode) in callers of cunescape_one.

basic: include only what we use This is a cleaned up result of running iwyu but without forward declarations on src/basic.

escape: add cescape_length() call as generalization of cescape()

util-lib: move character class definitions to string-util.h

Revert "utf8.[ch]: use char32_t and char16_t instead of int, int32_t, int16_t"

utf8.[ch]: use char32_t and char16_t instead of int, int32_t, int16_t rework C11 utf8.[ch] to use char32_t instead of uint32_t when referring to unicode chars, to make things more expressive.

util-lib: split out allocation calls into alloc-util.[ch]

util-lib: split out hex/dec/oct encoding/decoding into its own file

util: split out escaping code into escape.[ch] This really deserves its own file, given how much code this is now.