On Fri, Aug 7, 2026 at 1:28 PM Keith Thompson <[email protected]> wrote: > > The `isspace(3)` man page is badly out of date. > > "isspace is a macro which classifies singlebyte charset values by > table lookup. It is a predicate returning non-zero for whitespace > characters, and 0 for other characters. It is defined only when > isascii(c) is true or c is EOF." > > In fact, the ISO C standard, since C89/C90, requires that isspace(c) > is defined when c either representable as an unsigned char or equal to > EOF; the behavior is undefined for any other value. > > And the actual implementation of isspace() satisfies this requirement. > Only the man page is out of date. > > The man page is generated from newlib/libc/ctype/isspace.c in the > newlib git repo, <https://sourceware.org/git/newlib-cygwin.git>. > > This only affects the isspace(3) man page. The other is*(3) man pages > are correct. > > A couple of minor points affecting all the <ctype.h> functions/macros: > > There are two occurrences of "#include <ctype.h>" in the SYNOPSIS > section. The second occurrence is indented too far: > > SYNOPSIS > #include <ctype.h> > > int isspace(int c); > > #include <ctype.h> > > int isspace_l(int c, locale_t locale); > > A lot of library man pages refer to "ANSI C". "ISO C" would be > more accurate. The term "ANSI C" is ambiguous. Since 1990, the > C standard is controlled by ISO; ANSI adopts each ISO C standard > after it's published.
I've reported this, with a proposed patch, to the [email protected] mailing list. https://sourceware.org/pipermail/newlib/2026/022575.html -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
