RCS ID police

Sync with 4.4lite2

Add RCS indentifiers.

branches: 1.1.1;
Initial revision

Remove workaround for ancient HTML generation code.

Add a HISTORY section
Move information about exit status to EXIT STATUS section
Add more xrefs

ok wiz@

fix usage (thanks wiz)

add a flag to avoid mmap...

branches: 1.9.80;
Move UCB-licensed code from 4-clause to 3-clause licence.

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

Generate <>& symbolically. I'm avoiding .../dist/... directories for now.

Whitespace cleanup.

WARNSify, fix .Nm usage

RCS ID police

Sync with 4.4lite2

Document the fact that cmp now conforms to POSIX.2.

Add RCS indentifiers.

branches: 1.1.1;
Initial revision

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

Use __dead

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

branches: 1.7.16;
provide more detailed messages with -l. From Anon Ymous

If one file is shorter than the other, print the byte and line offsets if
available. From our anonymous contributor.

branches: 1.5.6;
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.

RCS ID police

Sync with 4.4lite2

branches: 1.1.1;
Initial revision

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

branches: 1.11.16;
change error printing to signed for consistency. From Anon Ymous

provide more detailed messages with -l. From Anon Ymous

If one file is shorter than the other, print the byte and line offsets if
available. From our anonymous contributor.

branches: 1.8.6;
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.

use %ll_ instead of the less standard %q_

fix compile warnings on the alpha.

WARNSify, fix .Nm usage

RCS ID police

Sync with 4.4lite2

branches: 1.1.1;
Initial revision

Make cmp -s and cmp -l much faster by comparing blocks and skipping any
line number calculations not needed. Approx 3-4x faster for two multi-GB
in-cache files on my Zen 3.

Restores the spirit of a NetII optimisation lost with 4.4lite2 import
in 1995.

branches: 1.25.8;
PR/55916: William Ahern: cmp -s + regular files + skipping is broken
Move test after length is adjusted

Explicitly include <stdint.h> for uintmax_t; from Eitan Adler.

branches: 1.23.6;
Remove unused header. From Henning Petersen in PR 45658.

branches: 1.22.6;
Compare size_t vs off_t by casting both to uintmax_t

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

branches: 1.20.28;
off-by-one (thanks to our anonymous contributor)

If one file is shorter than the other, print the byte and line offsets if
available. From our anonymous contributor.

branches: 1.18.2;
Don't put a space before function call operator.

byte offset and line count shouldn't be initialized inside the loop.

Fix indent and wrap long lines.

Initialise dfound outside loop so that 0 sized files compare correctly
and to that 'cmp -l' will exit with error is the last block matches.
Pointed out in a private mail bt someone who wishes to remain anonymous.

mmap normal files in 1MB chunks.
Due to a bug in mmap() the address space isn't counted against ulimit
until the page is faulted in - so mmapping a large file suceeds, but
cmp SIGSEGVs when it runs out of address space.
Also I don't believe that the madvise( MAP_SEQUENTIAL) has the desired
effect, and mmaping a large file is probably very bad for the UBC.

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.

use %ll_ instead of the less standard %q_

Use MAP_SHARED.

Do not mmap() with MAP_PRIVATE - looks like kernel tries to preallocate
some memory in case the mmapped contents would be changed and this fails
for very large files; it's unnecessary anyway, cmp(1) does not change file
contents in any way.
This fixes bin/10625 by Uwe Klaus.

While here, change the code to fallback to classic stdio if mmap fails.

branches: 1.8.4;
* Hint MADV_SEQUENTIAL.
* -1 -> MAP_FAILED.

Add { and } to shut up egcs. Reformat the more questionable code.

use MAP_PRIVATE|MAP_FILE rather than "0"

fix compile warnings on the alpha.

WARNSify, fix .Nm usage

RCS ID police

Sync with 4.4lite2

branches: 1.1.1;
Initial revision

Remove unused header. From Henning Petersen in PR 45658.

branches: 1.13.6;
Fix WARNS=4 issues (many -Wcast-qual, one -Wsign-compare on amd64)

branches: 1.12.16;
provide more detailed messages with -l. From Anon Ymous

If one file is shorter than the other, print the byte and line offsets if
available. From our anonymous contributor.

branches: 1.10.2;
Coverity CID 1624: Plug memory leak.

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.

use %ll_ instead of the less standard %q_

Add { and } to shut up egcs. Reformat the more questionable code.

fix compile warnings on the alpha.

WARNSify, fix .Nm usage

RCS ID police

Sync with 4.4lite2

branches: 1.1.1;
Initial revision