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