Re: [PATCH 1/3] remove prefix argument from pathspec_prefix
From: Junio C Hamano <hidden>
Date: 2016-06-15 22:51:59
Clemens Buchacher [off-list ref] writes:
Passing a prefix to a function that is supposed to find the prefix is strange. And it's really only used if the pathspec is NULL. Make the callers handle this case instead. Signed-off-by: Clemens Buchacher <redacted>
While I find the above rationale a reasonable justification for the removal of a parameter from the function, it does not seem to justify why the type of the returned value from the function needed to be changed. Is it because we no longer ever return "prefix" we pass in which is a pointer to a constant memory region to begin with? We also didn't free() in the earlier code (because we do not know if it can be freed) and leaking xmemdupz() if the function didn't return the "prefix", but now you plugged the small leak. Isn't it something you should advertise?
quoted hunk
diff --git a/builtin/commit.c b/builtin/commit.c index cbc9613..64fe501 100644 --- a/builtin/commit.c +++ b/builtin/commit.c@@ -255,8 +255,9 @@ static int list_paths(struct string_list *list, const char *with_tree, m = xcalloc(1, i); if (with_tree) { - const char *max_prefix = pathspec_prefix(prefix, pattern); - overlay_tree_on_cache(with_tree, max_prefix); + char *max_prefix = pathspec_prefix(pattern); + overlay_tree_on_cache(with_tree, max_prefix ? max_prefix : prefix); + free(max_prefix); } for (i = 0; i < active_nr; i++) {diff --git a/builtin/ls-files.c b/builtin/ls-files.c index e8a800d..a54c2a2 100644 --- a/builtin/ls-files.c +++ b/builtin/ls-files.c@@ -545,7 +545,7 @@ int cmd_ls_files(int argc, const char **argv, const char *cmd_prefix) strip_trailing_slash_from_submodules(); /* Find common prefix for all pathspec's */ - max_prefix = pathspec_prefix(prefix, pathspec); + max_prefix = pathspec_prefix(pathspec); max_prefix_len = max_prefix ? strlen(max_prefix) : 0; /* Treat unmatching pathspec elements as errors */diff --git a/cache.h b/cache.h index 607c2ea..0ccc84d 100644 --- a/cache.h +++ b/cache.h@@ -444,7 +444,7 @@ extern void set_git_work_tree(const char *tree); #define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES" extern const char **get_pathspec(const char *prefix, const char **pathspec); -extern const char *pathspec_prefix(const char *prefix, const char **pathspec); +extern char *pathspec_prefix(const char **pathspec); extern void setup_work_tree(void); extern const char *setup_git_directory_gently(int *); extern const char *setup_git_directory(void);diff --git a/setup.c b/setup.c index 27c1d47..0906790 100644 --- a/setup.c +++ b/setup.c@@ -236,13 +236,13 @@ const char **get_pathspec(const char *prefix, const char **pathspec) return pathspec; } -const char *pathspec_prefix(const char *prefix, const char **pathspec) +char *pathspec_prefix(const char **pathspec) { const char **p, *n, *prev; unsigned long max; if (!pathspec) - return prefix ? xmemdupz(prefix, strlen(prefix)) : NULL; + return NULL; prev = NULL; max = PATH_MAX;