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2017-10-26xdiff-interface: export comparing and hashing stringsLibravatar Stefan Beller1-0/+16
This will turn out to be useful in a later patch. xdl_recmatch is exported in xdiff/xutils.h, to be used by various xdiff/*.c files, but not outside of xdiff/. This one makes it available to the outside, too. While at it, add documentation. Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-09-07Convert read_mmblob to take struct object_id.Libravatar brian m. carlson1-1/+2
Since all of its callers have been updated, convert read_mmblob to take a pointer to struct object_id. Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-09-28xdiff: reject files larger than ~1GBLibravatar Jeff King1-0/+7
The xdiff code is not prepared to handle extremely large files. It uses "int" in many places, which can overflow if we have a very large number of lines or even bytes in our input files. This can cause us to produce incorrect diffs, with no indication that the output is wrong. Or worse, we may even underallocate a buffer whose size is the result of an overflowing addition. We're much better off to tell the user that we cannot diff or merge such a large file. This patch covers both cases, but in slightly different ways: 1. For merging, we notice the large file and cleanly fall back to a binary merge (which is effectively "we cannot merge this"). 2. For diffing, we make the binary/text distinction much earlier, and in many different places. For this case, we'll use the xdi_diff as our choke point, and reject any diff there before it hits the xdiff code. This means in most cases we'll die() immediately after. That's not ideal, but in practice we shouldn't generally hit this code path unless the user is trying to do something tricky. We already consider files larger than core.bigfilethreshold to be binary, so this code would only kick in when that is circumvented (either by bumping that value, or by using a .gitattribute to mark a file as diffable). In other words, we can avoid being "nice" here, because there is already nice code that tries to do the right thing. We are adding the suspenders to the nice code's belt, so notice when it has been worked around (both to protect the user from malicious inputs, and because it is better to die() than generate bogus output). The maximum size was chosen after experimenting with feeding large files to the xdiff code. It's just under a gigabyte, which leaves room for two obvious cases: - a diff3 merge conflict result on files of maximum size X could be 3*X plus the size of the markers, which would still be only about 3G, which fits in a 32-bit int. - some of the diff code allocates arrays of one int per record. Even if each file consists only of blank lines, then a file smaller than 1G will have fewer than 1G records, and therefore the int array will fit in 4G. Since the limit is arbitrary anyway, I chose to go under a gigabyte, to leave a safety margin (e.g., we would not want to overflow by allocating "(records + 1) * sizeof(int)" or similar. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2012-05-09xdiff: remove emit_func() and xdi_diff_hunks()Libravatar René Scharfe1-4/+0
The functions are unused now, remove them. Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-05-04Merge branch 'maint-1.7.0' into maintLibravatar Junio C Hamano1-2/+1
* maint-1.7.0: remove ecb parameter from xdi_diff_outf()
2010-05-04remove ecb parameter from xdi_diff_outf()Libravatar René Scharfe1-2/+1
xdi_diff_outf() overrides the structure members of its last parameter, ignoring any value that callers pass in. It's no surprise then that all callers pass a pointer to an uninitialized structure. They also don't read it after the call, so the parameter is neither used for input nor for output. Turn it into a local variable of xdi_diff_outf(). Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx> Acked-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-02-17refactor duplicated fill_mm() in checkout and merge-recursiveLibravatar Michael Lukashov1-0/+1
The following function is duplicated: fill_mm Move it to xdiff-interface.c and rename it 'read_mmblob', as suggested by Junio C Hamano. Also, change parameters order for consistency with read_mmfile(). Signed-off-by: Michael Lukashov <michael.lukashov@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-07-01userdiff: add xdiff_clear_find_func()Libravatar René Scharfe1-0/+1
xdiff_set_find_func() is used to set user defined regular expressions for finding function signatures. Add xdiff_clear_find_func(), which frees the memory allocated by the former, making the API complete. Also, use the new function in diff.c (the only call site of xdiff_set_find_func()) to clean up after ourselves. Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-10-25add xdi_diff_hunks() for callers that only need hunk lengthsLibravatar René Scharfe1-0/+4
Based on a patch by Brian Downing, this uses the xdiff emit_func feature to implement xdi_diff_hunks(). It's a function that calls a callback for each hunk of a diff, passing its lengths. Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-09-29Merge branch 'bc/master-diff-hunk-header-fix'Libravatar Shawn O. Pearce1-1/+1
* bc/master-diff-hunk-header-fix: Clarify commit error message for unmerged files Use strchrnul() instead of strchr() plus manual workaround Use remove_path from dir.c instead of own implementation Add remove_path: a function to remove as much as possible of a path git-submodule: Fix "Unable to checkout" for the initial 'update' Clarify how the user can satisfy stash's 'dirty state' check. t4018-diff-funcname: test syntax of builtin xfuncname patterns t4018-diff-funcname: test syntax of builtin xfuncname patterns make "git remote" report multiple URLs diff hunk pattern: fix misconverted "\{" tex macro introducers diff: fix "multiple regexp" semantics to find hunk header comment diff: use extended regexp to find hunk headers diff: use extended regexp to find hunk headers diff.*.xfuncname which uses "extended" regex's for hunk header selection diff.c: associate a flag with each pattern and use it for compiling regex diff.c: return pattern entry pointer rather than just the hunk header pattern Conflicts: builtin-merge-recursive.c t/t7201-co.sh xdiff-interface.h
2008-09-29Merge branch 'jc/better-conflict-resolution'Libravatar Shawn O. Pearce1-0/+2
* jc/better-conflict-resolution: Fix AsciiDoc errors in merge documentation git-merge documentation: describe how conflict is presented checkout --conflict=<style>: recreate merge in a non-default style checkout -m: recreate merge when checking out of unmerged index git-merge-recursive: learn to honor merge.conflictstyle merge.conflictstyle: choose between "merge" and "diff3 -m" styles rerere: understand "diff3 -m" style conflicts with the original rerere.c: use symbolic constants to keep track of parsing states xmerge.c: "diff3 -m" style clips merge reduction level to EAGER or less xmerge.c: minimum readability fixups xdiff-merge: optionally show conflicts in "diff3 -m" style xdl_fill_merge_buffer(): separate out a too deeply nested function checkout --ours/--theirs: allow checking out one side of a conflicting merge checkout -f: allow ignoring unmerged paths when checking out of the index Conflicts: Documentation/git-checkout.txt builtin-checkout.c builtin-merge-recursive.c t/t7201-co.sh
2008-09-18Merge branch 'bc/maint-diff-hunk-header-fix' into bc/master-diff-hunk-header-fixLibravatar Junio C Hamano1-1/+1
* bc/maint-diff-hunk-header-fix: diff.*.xfuncname which uses "extended" regex's for hunk header selection diff.c: associate a flag with each pattern and use it for compiling regex diff.c: return pattern entry pointer rather than just the hunk header pattern Cosmetical command name fix Start conforming code to "git subcmd" style part 3 t9700/test.pl: remove File::Temp requirement t9700/test.pl: avoid bareword 'STDERR' in 3-argument open() GIT 1.6.0.2 Fix some manual typos. Use compatibility regex library also on FreeBSD Use compatibility regex library also on AIX Update draft release notes for 1.6.0.2 Use compatibility regex library for OSX/Darwin git-svn: Fixes my() parameter list syntax error in pre-5.8 Perl Git.pm: Use File::Temp->tempfile instead of ->new t7501: always use test_cmp instead of diff Start conforming code to "git subcmd" style part 2 diff: Help "less" hide ^M from the output checkout: do not check out unmerged higher stages randomly Conflicts: Documentation/git.txt Documentation/gitattributes.txt Makefile diff.c t/t7201-co.sh
2008-09-18diff.c: associate a flag with each pattern and use it for compiling regexLibravatar Brandon Casey1-1/+1
This is in preparation for allowing extended regular expression patterns. Signed-off-by: Brandon Casey <casey@nrlssc.navy.mil> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-08-30merge.conflictstyle: choose between "merge" and "diff3 -m" stylesLibravatar Junio C Hamano1-0/+2
This teaches "git merge-file" to honor merge.conflictstyle configuration variable, whose value can be "merge" (default) or "diff3". Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-08-14xdiff-interface: hide the whole "xdiff_emit_state" business from the callerLibravatar Junio C Hamano1-9/+2
This further enhances xdi_diff_outf() interface so that it takes two common parameters: the callback function that processes one line at a time, and a pointer to its application specific callback data structure. xdi_diff_outf() creates its own "xdiff_emit_state" structure and stashes these two away inside it, which is used by the lowest level output function in the xdiff_outf() callchain, consume_one(), to call back to the application layer. With this restructuring, we lift the requirement that the caller supplied callback data structure embeds xdiff_emit_state structure as its first member. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-08-13Use strbuf for struct xdiff_emit_state's remainderLibravatar Brian Downing1-2/+2
Continually xreallocing and freeing the remainder member of struct xdiff_emit_state was a noticeable performance hit. Use a strbuf instead. This yields a decent performance improvement on "git blame" on certain repositories. For example, before this commit: $ time git blame -M -C -C -p --incremental server.c >/dev/null 101.52user 0.17system 1:41.73elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (0major+39561minor)pagefaults 0swaps With this commit: $ time git blame -M -C -C -p --incremental server.c >/dev/null 80.38user 0.30system 1:20.81elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (0major+50979minor)pagefaults 0swaps Signed-off-by: Brian Downing <bdowning@lavos.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-08-13Make xdi_diff_outf interface for running xdiff_outf diffsLibravatar Brian Downing1-1/+3
To prepare for the need to initialize and release resources for an xdi_diff with the xdiff_outf output function, make a new function to wrap this usage. Old: ecb.outf = xdiff_outf; ecb.priv = &state; ... xdi_diff(file_p, file_o, &xpp, &xecfg, &ecb); New: xdi_diff_outf(file_p, file_o, &state.xm, &xpp, &xecfg, &ecb); Signed-off-by: Brian Downing <bdowning@lavos.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-12-13xdl_diff: identify call sites.Libravatar Junio C Hamano1-0/+1
This inserts a new function xdi_diff() that currently does not do anything other than calling the underlying xdl_diff() to the callchain of current callers of xdl_diff() function. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-07-06Per-path attribute based hunk header selection.Libravatar Junio C Hamano1-0/+2
This makes"diff -p" hunk headers customizable via gitattributes mechanism. It is based on Johannes's earlier patch that allowed to define a single regexp to be used for everything. The mechanism to arrive at the regexp that is used to define hunk header is the same as other use of gitattributes. You assign an attribute, funcname (because "diff -p" typically uses the name of the function the patch is about as the hunk header), a simple string value. This can be one of the names of built-in pattern (currently, "java" is defined) or a custom pattern name, to be looked up from the configuration file. (in .gitattributes) *.java funcname=java *.perl funcname=perl (in .git/config) [funcname] java = ... # ugly and complicated regexp to override the built-in one. perl = ... # another ugly and complicated regexp to define a new one. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-06-04Move buffer_is_binary() to xdiff-interface.hLibravatar Johannes Schindelin1-0/+1
We already have two instances where we want to determine if a buffer contains binary data as opposed to text. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2006-12-21move read_mmfile() into xdiff-interfaceLibravatar Johannes Schindelin1-0/+1
read_file() was a useful function if you want to work with the xdiff stuff, so it was renamed and put into a more central place. Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-06Match ofs/cnt types in diff interface.Libravatar Junio C Hamano1-2/+2
Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-05combine-diff: move the code to parse hunk-header into common library.Libravatar Junio C Hamano1-0/+3
Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-05combine-diff: refactor built-in xdiff interface.Libravatar Junio C Hamano1-0/+18
This refactors the line-by-line callback mechanism used in combine-diff so that other programs can reuse it more easily. Signed-off-by: Junio C Hamano <junkio@cox.net>