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* Replace all die("BUG: ...") calls by BUG() onesJohannes Schindelin2018-05-061-5/+5
| | | | | | | | | | | | | | | | | | | | | In d8193743e08 (usage.c: add BUG() function, 2017-05-12), a new macro was introduced to use for reporting bugs instead of die(). It was then subsequently used to convert one single caller in 588a538ae55 (setup_git_env: convert die("BUG") to BUG(), 2017-05-12). The cover letter of the patch series containing this patch (cf 20170513032414.mfrwabt4hovujde2@sigill.intra.peff.net) is not terribly clear why only one call site was converted, or what the plan is for other, similar calls to die() to report bugs. Let's just convert all remaining ones in one fell swoop. This trick was performed by this invocation: sed -i 's/die("BUG: /BUG("/g' $(git grep -l 'die("BUG' \*.c) Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* exec_cmd: rename to use dash in file nameStefan Beller2018-04-111-1/+1
| | | | | | | This is more consistent with the project style. The majority of Git's source files use dashes in preference to underscores in their file names. Signed-off-by: Stefan Beller <sbeller@google.com>
* hashmap: add API to disable item counting when threadedjh/hashmap-disable-countingJeff Hostetler2017-09-071-6/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This is to address concerns raised by ThreadSanitizer on the mailing list about threaded unprotected R/W access to map.size with my previous "disallow rehash" change (0607e10009ee4e37cb49b4cec8d28a9dda1656a4). See: https://public-inbox.org/git/adb37b70139fd1e2bac18bfd22c8b96683ae18eb.1502780344.git.martin.agren@gmail.com/ Add API to hashmap to disable item counting and thus automatic rehashing. Also include API to later re-enable them. When item counting is disabled, the map.size field is invalid. So to prevent accidents, the field has been renamed and an accessor function hashmap_get_size() has been added. All direct references to this field have been been updated. And the name of the field changed to map.private_size to communicate this. Here is the relevant output from ThreadSanitizer showing the problem: WARNING: ThreadSanitizer: data race (pid=10554) Read of size 4 at 0x00000082d488 by thread T2 (mutexes: write M16): #0 hashmap_add hashmap.c:209 #1 hash_dir_entry_with_parent_and_prefix name-hash.c:302 #2 handle_range_dir name-hash.c:347 #3 handle_range_1 name-hash.c:415 #4 lazy_dir_thread_proc name-hash.c:471 #5 <null> <null> Previous write of size 4 at 0x00000082d488 by thread T1 (mutexes: write M31): #0 hashmap_add hashmap.c:209 #1 hash_dir_entry_with_parent_and_prefix name-hash.c:302 #2 handle_range_dir name-hash.c:347 #3 handle_range_1 name-hash.c:415 #4 handle_range_dir name-hash.c:380 #5 handle_range_1 name-hash.c:415 #6 lazy_dir_thread_proc name-hash.c:471 #7 <null> <null> Martin gives instructions for running TSan on test t3008 in this post: https://public-inbox.org/git/CAN0heSoJDL9pWELD6ciLTmWf-a=oyxe4EXXOmCKvsG5MSuzxsA@mail.gmail.com/ Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* attr.c: drop hashmap_cmp_fn castStefan Beller2017-07-051-5/+7
| | | | | | | | | MAke the code more readable and less error prone by avoiding the cast of the compare function pointer in hashmap_init, but instead have the correctly named void pointers to casted to the specific data structure. Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* hashmap.h: compare function has access to a data fieldStefan Beller2017-06-301-3/+4
| | | | | | | | | | | | | | | | | | | | | When using the hashmap a common need is to have access to caller provided data in the compare function. A couple of times we abuse the keydata field to pass in the data needed. This happens for example in patch-ids.c. This patch changes the function signature of the compare function to have one more void pointer available. The pointer given for each invocation of the compare function must be defined in the init function of the hashmap and is just passed through. Documentation of this new feature is deferred to a later patch. This is a rather mechanical conversion, just adding the new pass-through parameter. However while at it improve the naming of the fields of all compare functions used by hashmaps by ensuring unused parameters are prefixed with 'unused_' and naming the parameters what they are (instead of 'unused' make it 'unused_keydata'). Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* Merge branch 'ab/free-and-null'Junio C Hamano2017-06-241-4/+2
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | A common pattern to free a piece of memory and assign NULL to the pointer that used to point at it has been replaced with a new FREE_AND_NULL() macro. * ab/free-and-null: *.[ch] refactoring: make use of the FREE_AND_NULL() macro coccinelle: make use of the "expression" FREE_AND_NULL() rule coccinelle: add a rule to make "expression" code use FREE_AND_NULL() coccinelle: make use of the "type" FREE_AND_NULL() rule coccinelle: add a rule to make "type" code use FREE_AND_NULL() git-compat-util: add a FREE_AND_NULL() wrapper around free(ptr); ptr = NULL
| * coccinelle: make use of the "type" FREE_AND_NULL() ruleÆvar Arnfjörð Bjarmason2017-06-161-4/+2
| | | | | | | | | | | | | | | | | | | | Apply the result of the just-added coccinelle rule. This manually excludes a few occurrences, mostly things that resulted in many FREE_AND_NULL() on one line, that'll be manually fixed in a subsequent change. Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* | Merge branch 'bw/config-h'Junio C Hamano2017-06-241-0/+1
|\ \ | |/ |/| | | | | | | | | | | | | | | | | | | | | | | Fix configuration codepath to pay proper attention to commondir that is used in multi-worktree situation, and isolate config API into its own header file. * bw/config-h: config: don't implicitly use gitdir or commondir config: respect commondir setup: teach discover_git_directory to respect the commondir config: don't include config.h by default config: remove git_config_iter config: create config.h
| * config: don't include config.h by defaultBrandon Williams2017-06-151-0/+1
| | | | | | | | | | | | | | | | Stop including config.h by default in cache.h. Instead only include config.h in those files which require use of the config system. Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* | wrapper.c: add and use fopen_or_warn()Nguyễn Thái Ngọc Duy2017-05-261-5/+2
|/ | | | | | | | | | When fopen() returns NULL, it could be because the given path does not exist, but it could also be some other errors and the caller has to check. Add a wrapper so we don't have to repeat the same error check everywhere. Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* pathspec: allow querying for attributesBrandon Williams2017-03-131-0/+17
| | | | | | | | | | | The pathspec mechanism is extended via the new ":(attr:eol=input)pattern/to/match" syntax to filter paths so that it requires paths to not just match the given pattern but also have the specified attrs attached for them to be chosen. Based on a patch by Stefan Beller <sbeller@google.com> Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* attr: reformat git_attr_set_direction() functionbw/attrBrandon Williams2017-02-011-29/+20
| | | | | | | | | | | | | | | | Move the 'git_attr_set_direction()' up to be closer to the variables that it modifies as well as a small formatting by renaming the variable 'new' to 'new_direction' so that it is more descriptive. Update the comment about how 'direction' is used to read the state of the world. It should be noted that callers of 'git_attr_set_direction()' should ensure that other threads are not making calls into the attribute system until after the call to 'git_attr_set_direction()' completes. This function essentially acts as reset button for the attribute system and should be handled with care. Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* attr: push the bare repo check into read_attr()Brandon Williams2017-02-011-60/+54
| | | | | | | | | | Push the bare repository check into the 'read_attr()' function. This avoids needing to have extra logic which creates an empty stack frame when inside a bare repo as a similar bit of logic already exists in the 'read_attr()' function. Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* attr: store attribute stack in attr_check structureBrandon Williams2017-02-011-88/+196
| | | | | | | | | | | | | | | | | | | | | | The last big hurdle towards a thread-safe API for the attribute system is the reliance on a global attribute stack that is modified during each call into the attribute system. This patch removes this global stack and instead a stack is stored locally in each attr_check instance. This opens up the opportunity for future optimizations to customize the attribute stack for the attributes that a particular attr_check struct is interested in. One caveat with pushing the attribute stack into the attr_check structure is that the attribute system now needs to keep track of all active attr_check instances. Due to the direction mechanism the stack needs to be dropped when the direction is switched. In order to ensure correctness when the direction is changed the attribute system needs to iterate through all active attr_check instances and drop each of their stacks. Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* attr: tighten const correctness with git_attr and match_attrBrandon Williams2017-02-011-6/+6
| | | | | Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* attr: remove maybe-real, maybe-macro from git_attrBrandon Williams2017-02-011-38/+37
| | | | | | | | | | | | | | | | | | Whether or not a git attribute is real or a macro isn't a property of the attribute but rather it depends on the attribute stack (which .gitattribute files were read). This patch removes the 'maybe_real' and 'maybe_macro' fields in a git_attr and instead adds the 'macro' field to a attr_check_item. The 'macro' indicates (if non-NULL) that a particular attribute is a macro for the given attribute stack. It's populated, through a quick scan of the attribute stack, with the match_attr that corresponds to the macro's definition. This way the attribute stack only needs to be scanned a single time prior to attribute collection instead of each time a macro needs to be expanded. Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* attr: eliminate global check_all_attr arrayBrandon Williams2017-02-011-39/+82
| | | | | | | | | | | | | | Currently there is a reliance on 'check_all_attr' which is a global array of 'attr_check_item' items which is used to store the value of each attribute during the collection process. This patch eliminates this global and instead creates an array per 'attr_check' instance which is then used in the attribute collection process. This brings the attribute system one step closer to being thread-safe. Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* attr: use hashmap for attribute dictionaryBrandon Williams2017-02-011-45/+128
| | | | | | | | | | | | | The current implementation of the attribute dictionary uses a custom hashtable. This modernizes the dictionary by converting it to the builtin 'hashmap' structure. Also, in order to enable a threaded API in the future add an accompanying mutex which must be acquired prior to accessing the dictionary of interned attributes. Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* attr: change validity check for attribute names to use positive logicJunio C Hamano2017-02-011-14/+20
| | | | | | | | | | | | | | Convert 'invalid_attr_name()' to 'attr_name_valid()' and use positive logic for the return value. In addition create a helper function that prints out an error message when an invalid attribute name is used. We could later update the message to exactly spell out what the rules for a good attribute name are, etc. Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* attr: pass struct attr_check to collect_some_attrsBrandon Williams2017-02-011-20/+13
| | | | | | | | | The old callchain used to take an array of attr_check_item items. Instead pass the 'attr_check' container object to 'collect_some_attrs()' and access the fields in the data structure directly. Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* attr: retire git_check_attrs() APIJunio C Hamano2017-02-011-1/+2
| | | | | | | | | | Since nobody uses the old API, make it file-scope static, and update the documentation to describe the new API. Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* attr: convert git_all_attrs() to use "struct attr_check"Junio C Hamano2017-02-011-20/+10
| | | | | | | | | | | | | | | | | | | | | | This updates the other two ways the attribute check is done via an array of "struct attr_check_item" elements. These two niches appear only in "git check-attr". * The caller does not know offhand what attributes it wants to ask about and cannot use attr_check_initl() to prepare the attr_check structure. * The caller may not know what attributes it wants to ask at all, and instead wants to learn everything that the given path has. Such a caller can call attr_check_alloc() to allocate an empty attr_check, and then call attr_check_append() to add attribute names one by one. Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* attr: (re)introduce git_check_attr() and struct attr_checkJunio C Hamano2017-02-011-0/+74
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | A common pattern to check N attributes for many paths is to (1) prepare an array A of N attr_check_item items; (2) call git_attr() to intern the N attribute names and fill A; (3) repeatedly call git_check_attrs() for path with N and A; A look-up for these N attributes for a single path P scans the entire attr_stack, starting from the .git/info/attributes file and then .gitattributes file in the directory the path P is in, going upwards to find .gitattributes file found in parent directories. An earlier commit 06a604e6 (attr: avoid heavy work when we know the specified attr is not defined, 2014-12-28) tried to optimize out this scanning for one trivial special case: when the attribute being sought is known not to exist, we do not have to scan for it. While this may be a cheap and effective heuristic, it would not work well when N is (much) more than 1. What we would want is a more customized way to skip irrelevant entries in the attribute stack, and the definition of irrelevance is tied to the set of attributes passed to git_check_attrs() call, i.e. the set of attributes being sought. The data necessary for this optimization needs to live alongside the set of attributes, but a simple array of git_attr_check_elem simply does not have any place for that. Introduce "struct attr_check" that contains N, the number of attributes being sought, and A, the array that holds N attr_check_item items, and a function git_check_attr() that takes a path P and this structure as its parameters. This structure can later be extended to hold extra data necessary for optimization. Also, to make it easier to write the first two steps in common cases, introduce git_attr_check_initl() helper function, which takes a NULL-terminated list of attribute names and initialize this structure. Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* attr: rename function and struct related to checking attributesJunio C Hamano2017-02-011-6/+6
| | | | | | | | | | | | | | | | The traditional API to check attributes is to prepare an N-element array of "struct git_attr_check" and pass N and the array to the function "git_check_attr()" as arguments. In preparation to revamp the API to pass a single structure, in which these N elements are held, rename the type used for these individual array elements to "struct attr_check_item" and rename the function to "git_check_attrs()". Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* attr.c: outline the future plans by heavily commentingJunio C Hamano2017-02-011-1/+39
| | | | | | | Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* attr.c: add push_stack() helperJunio C Hamano2017-02-011-38/+33
| | | | | | | | | | | | | There are too many repetitious "I have this new attr_stack element; push it at the top of the stack" sequence. The new helper function push_stack() gives us a way to express what is going on at these places, and as a side effect, halves the number of times we mention the attr_stack global variable. Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* attr: support quoting pathname patterns in C styleNguyễn Thái Ngọc Duy2017-02-011-2/+13
| | | | | | | | | | | | Full pattern must be quoted. So 'pat"t"ern attr' will give exactly 'pat"t"ern', not 'pattern'. Also clarify that leading whitespaces are not part of the pattern and document comment syntax. Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* attr.c: plug small leak in parse_attr_line()Junio C Hamano2017-02-011-4/+8
| | | | | | | | | | | | | | If any error is noticed after the match_attr structure is allocated, we shouldn't just return NULL from this function. Add a fail_return label that frees the allocated structure and returns NULL, and consistently jump there when we want to return NULL after cleaning up. Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* attr.c: tighten constness around "git_attr" structureJunio C Hamano2017-02-011-1/+1
| | | | | | | | | | It holds an interned string, and git_attr_name() is a way to peek into it. Make sure the involved pointer types are pointer-to-const. Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* attr.c: simplify macroexpand_one()Junio C Hamano2017-02-011-7/+4
| | | | | | | | | | | | | The double-loop wants to do an early return immediately when one matching macro is found. Eliminate the extra variable 'a' used for that purpose and rewrite the "assign the found item to 'a' to make it non-NULL and force the loop(s) to terminate" with a direct return from there. Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* attr.c: mark where #if DEBUG ends more clearlyJunio C Hamano2017-02-011-1/+1
| | | | | | | Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* attr.c: complete a sentence in a commentJunio C Hamano2017-02-011-1/+1
| | | | | | | Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* attr.c: explain the lack of attr-name syntax check in parse_attr()Junio C Hamano2017-02-011-0/+6
| | | | | | | Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* attr.c: update a stale comment on "struct match_attr"Junio C Hamano2017-02-011-3/+2
| | | | | | | | | | | | When 82dce998 (attr: more matching optimizations from .gitignore, 2012-10-15) changed a pointer to a string "*pattern" into an embedded "struct pattern" in struct match_attr, it forgot to update the comment that describes the structure. Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* attr.c: use strchrnul() to scan for one lineJunio C Hamano2017-02-011-2/+2
| | | | | | | Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* read info/{attributes,exclude} only when in repositoryJeff King2016-10-261-1/+5
| | | | | | | | | | | | | | | | | | | The low-level attribute and gitignore code will try to look in $GIT_DIR/info for any repo-level configuration files, even if we have not actually determined that we are in a repository (e.g., running "git grep --no-index"). In such a case they end up looking for ".git/info/attributes", etc. This is generally harmless, as such a file is unlikely to exist outside of a repository, but it's still conceptually the wrong thing to do. Let's detect this situation explicitly and skip reading the file (i.e., the same behavior we'd get if we were in a repository and the file did not exist). Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* Merge branch 'ss/exc-flag-is-a-collection-of-bits'Junio C Hamano2016-04-061-1/+1
|\ | | | | | | | | | | | | Code clean-up. * ss/exc-flag-is-a-collection-of-bits: dir: store EXC_FLAG_* values in unsigned integers
| * dir: store EXC_FLAG_* values in unsigned integersss/exc-flag-is-a-collection-of-bitsSaurav Sachidanand2016-03-011-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | The values defined by the macro EXC_FLAG_* (1, 4, 8, 16) are stored in fields of the structs "pattern" and "exclude", some functions arguments and a local variable. None of these uses its most significant bit in any special way and there is no good reason to use a signed integer for them. And while we're at it, document "flags" of "exclude" to explicitly state the values it's supposed to take on. Signed-off-by: Saurav Sachidanand <sauravsachidanand@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
| * Merge branch 'pt/xdg-config-path' into maintJunio C Hamano2015-06-051-5/+2
| |\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Code clean-up for xdg configuration path support. * pt/xdg-config-path: path.c: remove home_config_paths() git-config: replace use of home_config_paths() git-commit: replace use of home_config_paths() credential-store.c: replace home_config_paths() with xdg_config_home() dir.c: replace home_config_paths() with xdg_config_home() attr.c: replace home_config_paths() with xdg_config_home() path.c: implement xdg_config_home() t0302: "unreadable" test needs POSIXPERM t0302: test credential-store support for XDG_CONFIG_HOME git-credential-store: support XDG_CONFIG_HOME git-credential-store: support multiple credential files
| * \ Merge branch 'cn/bom-in-gitignore' into maintJunio C Hamano2015-05-131-2/+7
| |\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Teach the codepaths that read .gitignore and .gitattributes files that these files encoded in UTF-8 may have UTF-8 BOM marker at the beginning; this makes it in line with what we do for configuration files already. * cn/bom-in-gitignore: attr: skip UTF8 BOM at the beginning of the input file config: use utf8_bom[] from utf.[ch] in git_parse_source() utf8-bom: introduce skip_utf8_bom() helper add_excludes_from_file: clarify the bom skipping logic dir: allow a BOM at the beginning of exclude files
* | | | convert trivial cases to FLEX_ARRAY macrosJeff King2016-02-221-3/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Using FLEX_ARRAY macros reduces the amount of manual computation size we have to do. It also ensures we don't overflow size_t, and it makes sure we write the same number of bytes that we allocated. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* | | | convert trivial cases to ALLOC_ARRAYJeff King2016-02-221-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Each of these cases can be converted to use ALLOC_ARRAY or REALLOC_ARRAY, which has two advantages: 1. It automatically checks the array-size multiplication for overflow. 2. It always uses sizeof(*array) for the element-size, so that it can never go out of sync with the declared type of the array. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* | | | memoize common git-path "constant" filesjk/git-pathJeff King2015-08-101-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | One of the most common uses of git_path() is to pass a constant, like git_path("MERGE_MSG"). This has two drawbacks: 1. The return value is a static buffer, and the lifetime is dependent on other calls to git_path, etc. 2. There's no compile-time checking of the pathname. This is OK for a one-off (after all, we have to spell it correctly at least once), but many of these constant strings appear throughout the code. This patch introduces a series of functions to "memoize" these strings, which are essentially globals for the lifetime of the program. We compute the value once, take ownership of the buffer, and return the cached value for subsequent calls. cache.h provides a helper macro for defining these functions as one-liners, and defines a few common ones for global use. Using a macro is a little bit gross, but it does nicely document the purpose of the functions. If we need to touch them all later (e.g., because we learned how to change the git_dir variable at runtime, and need to invalidate all of the stored values), it will be much easier to have the complete list. Note that the shared-global functions have separate, manual declarations. We could do something clever with the macros (e.g., expand it to a declaration in some places, and a declaration _and_ a definition in path.c). But there aren't that many, and it's probably better to stay away from too-magical macros. Likewise, if we abandon the C preprocessor in favor of generating these with a script, we could get much fancier. E.g., normalizing "FOO/BAR-BAZ" into "git_path_foo_bar_baz". But the small amount of saved typing is probably not worth the resulting confusion to readers who want to grep for the function's definition. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* | | | Merge branch 'pt/xdg-config-path'Junio C Hamano2015-05-111-5/+2
|\ \ \ \ | | |_|/ | |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Code clean-up for xdg configuration path support. * pt/xdg-config-path: path.c: remove home_config_paths() git-config: replace use of home_config_paths() git-commit: replace use of home_config_paths() credential-store.c: replace home_config_paths() with xdg_config_home() dir.c: replace home_config_paths() with xdg_config_home() attr.c: replace home_config_paths() with xdg_config_home() path.c: implement xdg_config_home()
| * | | attr.c: replace home_config_paths() with xdg_config_home()Paul Tan2015-05-061-5/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Since only the xdg attributes file path is required, simplify the code by using xdg_config_home() instead of home_config_paths(). Signed-off-by: Paul Tan <pyokagan@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* | | | Merge branch 'cn/bom-in-gitignore'Junio C Hamano2015-05-051-2/+7
|\ \ \ \ | |_|/ / |/| | / | | |/ | |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | Teach the codepaths that read .gitignore and .gitattributes files that these files encoded in UTF-8 may have UTF-8 BOM marker at the beginning; this makes it in line with what we do for configuration files already. * cn/bom-in-gitignore: attr: skip UTF8 BOM at the beginning of the input file config: use utf8_bom[] from utf.[ch] in git_parse_source() utf8-bom: introduce skip_utf8_bom() helper add_excludes_from_file: clarify the bom skipping logic dir: allow a BOM at the beginning of exclude files
| * | attr: skip UTF8 BOM at the beginning of the input filecn/bom-in-gitignoreJunio C Hamano2015-04-161-2/+7
| |/ | | | | | | Signed-off-by: Junio C Hamano <gitster@pobox.com>
* | attr: avoid heavy work when we know the specified attr is not definednd/attr-optimNguyễn Thái Ngọc Duy2014-12-291-5/+28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If we have never seen attr 'X' in any .gitattributes file we have examined so far, we can be sure that 'X' is not defined. So no need to go over all the attr stack to look for attr 'X'. This is the purpose behind this new field maybe_real. This optimization breaks down if macros are involved because we can't know for sure what macro would expand to 'X' at attr parsing time. But if we go the pessimistic way and assume all macros are expanded, we hit the builtin "binary" macro. At least the "diff" attr defined in this macro will disable this optimization for git-grep. So we wait until any attr lines _may_ reference to a macro before we turn this off. In git.git, this reduces the number of fill_one() call for "git grep abcdefghi" from ~5348 to 2955. The optimization stops when it reads t/.gitattributes, which uses 'binary' macro. We could probably reduce it further by limiting the 'binary' reference to t/ and subdirs only in this case. "git grep" is actually a good example to justify this patch. The command checks "diff" attribute on every file. People usually don't define this attribute. But they pay the attr lookup penalty anyway without this patch, proportional to the number of attr lines they have in repo. Helped-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* | attr: do not attempt to expand when we know it's not a macroNguyễn Thái Ngọc Duy2014-12-291-3/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Keep track of all recognized macros in the new "maybe_macro" field. If this field is true, it _may_ be a macro (depending on what's in the current attr stack). But if the field is false, it's definitely not a macro, no need to go through the whole attr stack in macroexpand_one() to search for one. Without this, "git grep abcdefghi" on git.git hits the inner loop in macroexpand_one() 2481 times. With this, it's 66 times. Helped-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* | attr.c: rename arg name attr_nr to avoid shadowing the global oneNguyễn Thái Ngọc Duy2014-12-291-3/+3
|/ | | | | | Helped-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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