This simplifies maintenance, since it makes for just one
implementation of each function, letting the compiler have the fun
of optimization. In practice this works well nowadays with GCC.
E.g., c_isascii might need only three instructions even though the
source code lists every ASCII character individually in a large
switch statement.
Also, fix some z/OS porting bugs reported by Daniel Richard G. in:
http://lists.gnu.org/archive/html/bug-gnulib/2015-09/msg00037.html
* NEWS: Document the API change.
* lib/c-ctype.c: Drastically simplify, since this now just expands
inline functions.
* lib/c-ctype.h: Use _GL_INLINE_HEADER_BEGIN, _GL_INLINE_HEADER_END.
(C_CTYPE_INLINE): New macro.
(C_CTYPE_CONSECUTIVE_DIGITS, C_CTYPE_CONSECUTIVE_LOWERCASE)
(C_CTYPE_CONSECUTIVE_UPPERCASE): Remove.
Verify that either ASCII or EBCDIC is being used.
(_C_CTYPE_SIGNED_EBCDIC, _C_CTYPE_CNTRL, _C_CTYPE_A_THRU_F_N)
(_C_CTYPE_DIGIT_N, _C_CTYPE_LOWER_N, _C_CTYPE_UPPER_N)
(_C_CTYPE_CASES, _C_CTYPE_A_THRU_F, _C_CTYPE_DIGIT, _C_CTYPE_LOWER)
(_C_CTYPE_UPPER, _C_CTYPE_PUNCT_PLAIN):
New private macros.
(_C_CTYPE_CNTRL): In EBCDIC, '\x07' is a control, not '\xff'.
(c_isalnum, c_isalpha, c_isascii, c_isblank, c_iscntrl, c_isdigit)
(c_isgraph, c_islower, c_isprint, c_ispunct, c_isspace, c_isupper)
(c_isxdigit, c_tolower, c_toupper): Now inline functions.
(c_tolower, c_toupper): When converting, return the unsigned char,
as that is what z/OS does.
* lib/c-strcaseeq.h (CASEEQ): Simplify in the light of the removal
of some c-ctype.h macros.
* modules/c-ctype (Depends-on): Add extern-inline; remove verify.
* tests/test-c-ctype.c (test_all): Fix test for c_toupper and
c_tolower promotion to be compatible with z/OS.