(cherry picked from commit aeec40cb50eca6a97975765e2bacc28a5950cfa9)
When adding the last element to the result value of `mb_split`, the `chunk_pos` may point beyond the end of the string, in which case the unsigned `n` would underflow. Therefore, we check whether this is the case in the first place, and only calculate `n` otherwise. Since `n` is no longer used outside the block, we move its declaration inside. (cherry picked from commit e617f03066ce81d26f56c06d6bd7787c7de08703)
Also add some helper macros for PROTECT/UNPROTECT that check for IMMUTABLE. These checks are needed for nearly any use of PROTECT/UNPROTECT.
"auto" is only meaningful in functions which accept an encoding *list* and support encoding detection. These functions have explicit checks for "auto". It cannot be used as a standalone encoding in any meaningful capacity, so I'm dropping it entirely.
Implements 8bit conversions equivalently to iso-8859-1 conversions. This seems quite dubious to me, but seems to match the previous behavior. It might make more sense to map the characters into a private area instead, so that the 8bit encoding is treated as binary data with no case conversions (including no case conversions in the ascii range).
This patch adds missing newlines, trims multiple redundant final newlines into a single one, and trims redundant leading newlines in all *.phpt sections. According to POSIX, a line is a sequence of zero or more non-' <newline>' characters plus a terminating '<newline>' character. [1] Files should normally have at least one final newline character. C89 [2] and later standards [3] mention a final newline: "A source file that is not empty shall end in a new-line character, which shall not be immediately preceded by a backslash character." Although it is not mandatory for all files to have a final newline fixed, a more consistent and homogeneous approach brings less of commit differences issues and a better development experience in certain text editors and IDEs. [1] http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_206 [2] https://port70.net/~nsz/c/c89/c89-draft.html#2.1.1.2 [3] https://port70.net/~nsz/c/c99/n1256.html#5.1.1.2