src/usr.bin/diff/TODO, branch releng/12.2

MFC r356723-r356725, r357649, r357652: diff(1) catch-up

2020-04-27T22:33:32Z

r356723: mkstemp returns -1 r356724: asprintf returns -1, not an arbitrary value < 0. Also upon error the (very sloppy specification) leaves an undefined value in *ret, so it is wrong to inspect it, the error condition is enough. r356725: When system calls indicate an error they return -1, not some arbitrary value < 0. errno is only updated in this case. r357649: Update diff(1) TODO removing what has been implemented r357652: Fix most of the style warnings

diff(1): Implement -B/--ignore-blank-lines

2018-08-19T03:57:20Z

As noted by cem in r338035, coccinelle invokes diff(1) with the -B flag. This was not previously implemented here, so one was forced to create a link for GNU diff to /usr/local/bin/diff Implement the -B flag and add some primitive tests for it. It is implemented in the same fashion that -I is implemented; each chunk's lines are scanned, and if a non-blank line is encountered then the chunk will be output. Otherwise, it's skipped. MFC after: 2 weeks

Update the TODO list to reflect what has been changed

2017-04-20T19:07:52Z

Import diff from OpenBSD and remove GNU diff

2017-03-11T05:01:29Z

Some of the modifications from the previous summer of code has been integrated Modification for compatibility with GNU diff output has been added Main difference with OpenBSD: Implement multiple GNU diff options: * --ignore-file-name-case * --no-ignore-file-name-case * --normal * --tabsize * --strip-trailing-cr Make diff -p compatible with GNU diff Implement diff -l Make diff -r compatible with GNU diff Capsicumize diffing 2 regular files Add a simple test suite Approved by: AsiaBSDcon devsummit Obtained from: OpenBSD, GSoC Relnotes: yes