Avoid undefined behavior in ftok(3)

Do not change the signedness bit with a left shift operation.
Cast to unsigned integer to prevent this.

ftok.c:56:10, left shift of 123456789 by 24 places cannot

Avoid undefined behavior in ftok(3)

Do not change the signedness bit with a left shift operation.
Cast to unsigned integer to prevent this.

ftok.c:56:10, left shift of 123456789 by 24 places cannot be represented in type 'int'
ftok.c:56:10, left shift of 4160 by 24 places cannot be represented in type 'int'

Detected with micro-UBSan in the user mode.

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Use C89 definitions.
Remove use of __P

Change copyright to 2-clause BSD-copyright.
Changed with explicit permission of Thorsten Lockert (tholo sigmasoft com)

Delint.
Remove trailing ; from uses of __weak_alias(). The macro inserts this if
needed.

back out the #ifdef _DIAGNOSTIC argument checks; too many people complained.
_DIAGASSERT() is still retained.

* use _DIAGASSERT() to check pointer arguments against NULL and file
descriptors against -1 (as appropriate).
* add actual checks which to detect stuff that would trigger_DIAGASSERT(),
and attemp

* use _DIAGASSERT() to check pointer arguments against NULL and file
descriptors against -1 (as appropriate).
* add actual checks which to detect stuff that would trigger_DIAGASSERT(),
and attempt to return a sane error condition.
* knf some code
* remove some `register' decls.

the first two items result in the addition of code similar to the
following in various functions:

_DIAGASSERT(path != NULL)
#ifdef _DIAGNOSTIC
if (path == NULL) {
errno = EFAULT;
return (-1);
}
#endif

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Change the signature of ftok from (const char *, char) to (const char *, int)
Document that only the 8 least significant bits are used in the key generation
and that the return value is (key_t)-1
[th

Change the signature of ftok from (const char *, char) to (const char *, int)
Document that only the 8 least significant bits are used in the key generation
and that the return value is (key_t)-1
[this is to fix K&R vs. ansi compilation and lint warnings]

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If port provides __weak_alias(), provide an Standard C and POSIX pure
identifier namespace by renaming non standard functions and variables
such that they have a leading underscore. The library will

If port provides __weak_alias(), provide an Standard C and POSIX pure
identifier namespace by renaming non standard functions and variables
such that they have a leading underscore. The library will use those
names internally. Weak aliases are used to provide the original names
to the API.

This is only the first part of this change. It is most of the functions
which are implemented in C for all NetBSD ports. Subsequent changes are
to add the same support to the remaining C files, to assembly files, and
to the automagically generated assembly source used for system calls.
When all of the above is done, ports with weak alias support should add
a definition for __weak_alias to <sys/cdefs.h>.

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Fix RCSID's

merge with Lite, keeping local changes. Also use new Id format.

Moved RCS ID into static variable rcsid

Ftok() routine, needed by most programs that use SysV IPC.