cmp.c: use C99 strtoll(3) instead of legacy strtoq(3)

fix usage (thanks wiz)

add a flag to avoid mmap...

branches: 1.18.24;
Use __dead

Fix WARNS=4 issues (many -Wcast-qual, one -Wsign-compare on amd64)

branches: 1.16.6;
Remove the \n and tabs from the __COPYRIGHT() strings.
Tweak to use a consistent format.

branches: 1.15.22;
Apply patch from PR bin/23836 cmp did not correctly parse skip arguments
given in hex or octal, as the manpage states it can.

Taking (out) the __P

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22365, verified by myself.

make usage string match manpage

getopt returns -1 not EOF

WARNSify, fix .Nm usage

RCS ID police

don't warn about missing files with -s. POSIX doesn't define a specific
action, and, most other implimentations use this (sane) method. (from jtc).

Sync with 4.4lite2

Fix bug in handling short reads.

As suggested by Xavier Leroy <xavier@Theory.Stanford.EDU>, make sure we don't
flag a short read on the 2nd file as an EOF when it isn't. This implementation
differs in that at most one read is done per file per comparison, so that an
early mismatch may avoid hanging on input or continuing some expensive process
if reading from a pipe.

Get rid of otoi(), use strtoul() instead. Not only gets rid of a function,
but allows hex offsets as well.
Misc other minor tweaks.

Changed to conform to POSIX.2:
EOF message printed to stderr.
Removed bogositys wrt. getopt() processing (special casing `-' is unnecessary).
Updated usage message to document fact that -s and -l options are mutually
exclusive.

Add RCS identifiers.

branches: 1.1.1;
Initial revision

fix usage (thanks wiz)

add a flag to avoid mmap...

branches: 1.18.24;
Use __dead

Fix WARNS=4 issues (many -Wcast-qual, one -Wsign-compare on amd64)

branches: 1.16.6;
Remove the \n and tabs from the __COPYRIGHT() strings.
Tweak to use a consistent format.

branches: 1.15.22;
Apply patch from PR bin/23836 cmp did not correctly parse skip arguments
given in hex or octal, as the manpage states it can.

Taking (out) the __P

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22365, verified by myself.

make usage string match manpage

getopt returns -1 not EOF

WARNSify, fix .Nm usage

RCS ID police

don't warn about missing files with -s. POSIX doesn't define a specific
action, and, most other implimentations use this (sane) method. (from jtc).

Sync with 4.4lite2

Fix bug in handling short reads.

As suggested by Xavier Leroy <xavier@Theory.Stanford.EDU>, make sure we don't
flag a short read on the 2nd file as an EOF when it isn't. This implementation
differs in that at most one read is done per file per comparison, so that an
early mismatch may avoid hanging on input or continuing some expensive process
if reading from a pipe.

Get rid of otoi(), use strtoul() instead. Not only gets rid of a function,
but allows hex offsets as well.
Misc other minor tweaks.

Changed to conform to POSIX.2:
EOF message printed to stderr.
Removed bogositys wrt. getopt() processing (special casing `-' is unnecessary).
Updated usage message to document fact that -s and -l options are mutually
exclusive.

Add RCS identifiers.

branches: 1.1.1;
Initial revision