Merge branch 'rs/qsort'

We call "qsort(array, nelem, sizeof(array[0]), fn)", and most of
the time third parameter is redundant.  A new QSORT() macro lets us
omit it.

* rs/qsort:
  show-branch: use QSORT
  use QSORT, part 2
  coccicheck: use --all-includes by default
  remove unnecessary check before QSORT
  use QSORT
  add QSORT

Author: gitster

Makefile

@@ -467,6 +467,7 @@ SPATCH = spatch
 export TCL_PATH TCLTK_PATH
 
 SPARSE_FLAGS =
+SPATCH_FLAGS = --all-includes
 
 
 
@@ -2314,7 +2315,7 @@ C_SOURCES = $(patsubst %.o,%.c,$(C_OBJ))
 %.cocci.patch: %.cocci $(C_SOURCES)
 	@echo '    ' SPATCH $<; \
 	for f in $(C_SOURCES); do \
-		$(SPATCH) --sp-file $< $$f; \
+		$(SPATCH) --sp-file $< $$f $(SPATCH_FLAGS); \
 	done >$@ 2>$@.log; \
 	if test -s $@; \
 	then \

bisect.c

@@ -215,7 +215,7 @@ static struct commit_list *best_bisection_sorted(struct commit_list *list, int n
 		array[cnt].distance = distance;
 		cnt++;
 	}
-	qsort(array, cnt, sizeof(*array), compare_commit_dist);
+	QSORT(array, cnt, compare_commit_dist);
 	for (p = list, i = 0; i < cnt; i++) {
 		char buf[100]; /* enough for dist=%d */
 		struct object *obj = &(array[i].commit->object);

builtin/describe.c

@@ -352,7 +352,7 @@ static void describe(const char *arg, int last_one)
 			    oid_to_hex(oid));
 	}
 
-	qsort(all_matches, match_cnt, sizeof(all_matches[0]), compare_pt);
+	QSORT(all_matches, match_cnt, compare_pt);
 
 	if (gave_up_on) {
 		commit_list_insert_by_date(gave_up_on, &list);

builtin/fast-export.c

@@ -347,7 +347,7 @@ static void show_filemodify(struct diff_queue_struct *q,
 	 * Handle files below a directory first, in case they are all deleted
 	 * and the directory changes to a file or symlink.
 	 */
-	qsort(q->queue, q->nr, sizeof(q->queue[0]), depth_first);
+	QSORT(q->queue, q->nr, depth_first);
 
 	for (i = 0; i < q->nr; i++) {
 		struct diff_filespec *ospec = q->queue[i]->one;

builtin/fmt-merge-msg.c

@@ -314,14 +314,10 @@ static void add_people_info(struct strbuf *out,
 			    struct string_list *authors,
 			    struct string_list *committers)
 {
-	if (authors->nr)
-		qsort(authors->items,
-		      authors->nr, sizeof(authors->items[0]),
-		      cmp_string_list_util_as_integral);
-	if (committers->nr)
-		qsort(committers->items,
-		      committers->nr, sizeof(committers->items[0]),
-		      cmp_string_list_util_as_integral);
+	QSORT(authors->items, authors->nr,
+	      cmp_string_list_util_as_integral);
+	QSORT(committers->items, committers->nr,
+	      cmp_string_list_util_as_integral);
 
 	credit_people(out, authors, 'a');
 	credit_people(out, committers, 'c');

builtin/index-pack.c

@@ -1190,10 +1190,8 @@ static void resolve_deltas(void)
 		return;
 
 	/* Sort deltas by base SHA1/offset for fast searching */
-	qsort(ofs_deltas, nr_ofs_deltas, sizeof(struct ofs_delta_entry),
-	      compare_ofs_delta_entry);
-	qsort(ref_deltas, nr_ref_deltas, sizeof(struct ref_delta_entry),
-	      compare_ref_delta_entry);
+	QSORT(ofs_deltas, nr_ofs_deltas, compare_ofs_delta_entry);
+	QSORT(ref_deltas, nr_ref_deltas, compare_ref_delta_entry);
 
 	if (verbose || show_resolving_progress)
 		progress = start_progress(_("Resolving deltas"),
@@ -1356,7 +1354,7 @@ static void fix_unresolved_deltas(struct sha1file *f)
 	ALLOC_ARRAY(sorted_by_pos, nr_ref_deltas);
 	for (i = 0; i < nr_ref_deltas; i++)
 		sorted_by_pos[i] = &ref_deltas[i];
-	qsort(sorted_by_pos, nr_ref_deltas, sizeof(*sorted_by_pos), delta_pos_compare);
+	QSORT(sorted_by_pos, nr_ref_deltas, delta_pos_compare);
 
 	for (i = 0; i < nr_ref_deltas; i++) {
 		struct ref_delta_entry *d = sorted_by_pos[i];
@@ -1533,8 +1531,7 @@ static void read_v2_anomalous_offsets(struct packed_git *p,
 		opts->anomaly[opts->anomaly_nr++] = ntohl(idx2[off * 2 + 1]);
 	}
 
-	if (1 < opts->anomaly_nr)
-		qsort(opts->anomaly, opts->anomaly_nr, sizeof(uint32_t), cmp_uint32);
+	QSORT(opts->anomaly, opts->anomaly_nr, cmp_uint32);
 }
 
 static void read_idx_option(struct pack_idx_option *opts, const char *pack_name)

builtin/mktree.c

@@ -46,7 +46,7 @@ static void write_tree(unsigned char *sha1)
 	size_t size;
 	int i;
 
-	qsort(entries, used, sizeof(*entries), ent_compare);
+	QSORT(entries, used, ent_compare);
 	for (size = i = 0; i < used; i++)
 		size += 32 + entries[i]->len;
 

builtin/name-rev.c

@@ -195,8 +195,7 @@ static const char *get_exact_ref_match(const struct object *o)
 		return NULL;
 
 	if (!tip_table.sorted) {
-		qsort(tip_table.table, tip_table.nr, sizeof(*tip_table.table),
-		      tipcmp);
+		QSORT(tip_table.table, tip_table.nr, tipcmp);
 		tip_table.sorted = 1;
 	}
 

builtin/pack-objects.c

@@ -1535,7 +1535,7 @@ static void get_object_details(void)
 	sorted_by_offset = xcalloc(to_pack.nr_objects, sizeof(struct object_entry *));
 	for (i = 0; i < to_pack.nr_objects; i++)
 		sorted_by_offset[i] = to_pack.objects + i;
-	qsort(sorted_by_offset, to_pack.nr_objects, sizeof(*sorted_by_offset), pack_offset_sort);
+	QSORT(sorted_by_offset, to_pack.nr_objects, pack_offset_sort);
 
 	for (i = 0; i < to_pack.nr_objects; i++) {
 		struct object_entry *entry = sorted_by_offset[i];
@@ -2257,7 +2257,7 @@ static void prepare_pack(int window, int depth)
 		if (progress)
 			progress_state = start_progress(_("Compressing objects"),
 							nr_deltas);
-		qsort(delta_list, n, sizeof(*delta_list), type_size_sort);
+		QSORT(delta_list, n, type_size_sort);
 		ll_find_deltas(delta_list, n, window+1, depth, &nr_done);
 		stop_progress(&progress_state);
 		if (nr_done != nr_deltas)
@@ -2449,8 +2449,7 @@ static void add_objects_in_unpacked_packs(struct rev_info *revs)
 	}
 
 	if (in_pack.nr) {
-		qsort(in_pack.array, in_pack.nr, sizeof(in_pack.array[0]),
-		      ofscmp);
+		QSORT(in_pack.array, in_pack.nr, ofscmp);
 		for (i = 0; i < in_pack.nr; i++) {
 			struct object *o = in_pack.array[i].object;
 			add_object_entry(o->oid.hash, o->type, "", 0);

builtin/remote.c

@@ -1197,8 +1197,7 @@ static int show(int argc, const char **argv)
 
 		info.width = info.width2 = 0;
 		for_each_string_list(&states.push, add_push_to_show_info, &info);
-		qsort(info.list->items, info.list->nr,
-			sizeof(*info.list->items), cmp_string_with_push);
+		QSORT(info.list->items, info.list->nr, cmp_string_with_push);
 		if (info.list->nr)
 			printf_ln(Q_("  Local ref configured for 'git push'%s:",
 				     "  Local refs configured for 'git push'%s:",

builtin/shortlog.c

@@ -308,7 +308,7 @@ void shortlog_output(struct shortlog *log)
 	struct strbuf sb = STRBUF_INIT;
 
 	if (log->sort_by_number)
-		qsort(log->list.items, log->list.nr, sizeof(struct string_list_item),
+		QSORT(log->list.items, log->list.nr,
 		      log->summary ? compare_by_counter : compare_by_list);
 	for (i = 0; i < log->list.nr; i++) {
 		const struct string_list_item *item = &log->list.items[i];

builtin/show-branch.c

@@ -353,8 +353,7 @@ static int compare_ref_name(const void *a_, const void *b_)
 
 static void sort_ref_range(int bottom, int top)
 {
-	qsort(ref_name + bottom, top - bottom, sizeof(ref_name[0]),
-	      compare_ref_name);
+	QSORT(ref_name + bottom, top - bottom, compare_ref_name);
 }
 
 static int append_ref(const char *refname, const struct object_id *oid,
@@ -540,8 +539,7 @@ static void append_one_rev(const char *av)
 		if (saved_matches == ref_name_cnt &&
 		    ref_name_cnt < MAX_REVS)
 			error(_("no matching refs with %s"), av);
-		if (saved_matches + 1 < ref_name_cnt)
-			sort_ref_range(saved_matches, ref_name_cnt);
+		sort_ref_range(saved_matches, ref_name_cnt);
 		return;
 	}
 	die("bad sha1 reference %s", av);

contrib/coccinelle/qsort.cocci

@@ -0,0 +1,37 @@
+@@
+expression base, nmemb, compar;
+@@
+- qsort(base, nmemb, sizeof(*base), compar);
++ QSORT(base, nmemb, compar);
+
+@@
+expression base, nmemb, compar;
+@@
+- qsort(base, nmemb, sizeof(base[0]), compar);
++ QSORT(base, nmemb, compar);
+
+@@
+type T;
+T *base;
+expression nmemb, compar;
+@@
+- qsort(base, nmemb, sizeof(T), compar);
++ QSORT(base, nmemb, compar);
+
+@@
+expression base, nmemb, compar;
+@@
+- if (nmemb)
+    QSORT(base, nmemb, compar);
+
+@@
+expression base, nmemb, compar;
+@@
+- if (nmemb > 0)
+    QSORT(base, nmemb, compar);
+
+@@
+expression base, nmemb, compar;
+@@
+- if (nmemb > 1)
+    QSORT(base, nmemb, compar);

diff.c

@@ -2019,7 +2019,7 @@ static void show_dirstat(struct diff_options *options)
 		return;
 
 	/* Show all directories with more than x% of the changes */
-	qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
+	QSORT(dir.files, dir.nr, dirstat_compare);
 	gather_dirstat(options, &dir, changed, "", 0);
 }
 
@@ -2063,7 +2063,7 @@ static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *o
 		return;
 
 	/* Show all directories with more than x% of the changes */
-	qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
+	QSORT(dir.files, dir.nr, dirstat_compare);
 	gather_dirstat(options, &dir, changed, "", 0);
 }
 
@@ -4923,7 +4923,7 @@ static int diffnamecmp(const void *a_, const void *b_)
 void diffcore_fix_diff_index(struct diff_options *options)
 {
 	struct diff_queue_struct *q = &diff_queued_diff;
-	qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
+	QSORT(q->queue, q->nr, diffnamecmp);
 }
 
 void diffcore_std(struct diff_options *options)

diffcore-delta.c

@@ -158,10 +158,7 @@ static struct spanhash_top *hash_chars(struct diff_filespec *one)
 		n = 0;
 		accum1 = accum2 = 0;
 	}
-	qsort(hash->data,
-		1ul << hash->alloc_log2,
-		sizeof(hash->data[0]),
-		spanhash_cmp);
+	QSORT(hash->data, 1ul << hash->alloc_log2, spanhash_cmp);
 	return hash;
 }
 

diffcore-order.c

@@ -101,7 +101,7 @@ void order_objects(const char *orderfile, obj_path_fn_t obj_path,
 		objs[i].orig_order = i;
 		objs[i].order = match_order(obj_path(objs[i].obj));
 	}
-	qsort(objs, nr, sizeof(*objs), compare_objs_order);
+	QSORT(objs, nr, compare_objs_order);
 }
 
 static const char *pair_pathtwo(void *obj)

diffcore-rename.c

@@ -580,7 +580,7 @@ void diffcore_rename(struct diff_options *options)
 	stop_progress(&progress);
 
 	/* cost matrix sorted by most to least similar pair */
-	qsort(mx, dst_cnt * NUM_CANDIDATE_PER_DST, sizeof(*mx), score_compare);
+	QSORT(mx, dst_cnt * NUM_CANDIDATE_PER_DST, score_compare);
 
 	rename_count += find_renames(mx, dst_cnt, minimum_score, 0);
 	if (detect_rename == DIFF_DETECT_COPY)

dir.c

@@ -2005,8 +2005,8 @@ int read_directory(struct dir_struct *dir, const char *path, int len, const stru
 	if (!len || treat_leading_path(dir, path, len, simplify))
 		read_directory_recursive(dir, path, len, untracked, 0, simplify);
 	free_simplify(simplify);
-	qsort(dir->entries, dir->nr, sizeof(struct dir_entry *), cmp_name);
-	qsort(dir->ignored, dir->ignored_nr, sizeof(struct dir_entry *), cmp_name);
+	QSORT(dir->entries, dir->nr, cmp_name);
+	QSORT(dir->ignored, dir->ignored_nr, cmp_name);
 	if (dir->untracked) {
 		static struct trace_key trace_untracked_stats = TRACE_KEY_INIT(UNTRACKED_STATS);
 		trace_printf_key(&trace_untracked_stats,

fast-import.c

@@ -1460,9 +1460,9 @@ static void mktree(struct tree_content *t, int v, struct strbuf *b)
 	unsigned int i;
 
 	if (!v)
-		qsort(t->entries,t->entry_count,sizeof(t->entries[0]),tecmp0);
+		QSORT(t->entries, t->entry_count, tecmp0);
 	else
-		qsort(t->entries,t->entry_count,sizeof(t->entries[0]),tecmp1);
+		QSORT(t->entries, t->entry_count, tecmp1);
 
 	for (i = 0; i < t->entry_count; i++) {
 		if (t->entries[i]->versions[v].mode)

fetch-pack.c

@@ -819,7 +819,7 @@ static struct ref *do_fetch_pack(struct fetch_pack_args *args,
 	int agent_len;
 
 	sort_ref_list(&ref, ref_compare_name);
-	qsort(sought, nr_sought, sizeof(*sought), cmp_ref_by_name);
+	QSORT(sought, nr_sought, cmp_ref_by_name);
 
 	if ((args->depth > 0 || is_repository_shallow()) && !server_supports("shallow"))
 		die("Server does not support shallow clients");

git-compat-util.h

@@ -985,6 +985,14 @@ void git_qsort(void *base, size_t nmemb, size_t size,
 #define qsort git_qsort
 #endif
 
+#define QSORT(base, n, compar) sane_qsort((base), (n), sizeof(*(base)), compar)
+static inline void sane_qsort(void *base, size_t nmemb, size_t size,
+			      int(*compar)(const void *, const void *))
+{
+	if (nmemb > 1)
+		qsort(base, nmemb, size, compar);
+}
+
 #ifndef REG_STARTEND
 #error "Git requires REG_STARTEND support. Compile with NO_REGEX=NeedsStartEnd"
 #endif

help.c

@@ -170,8 +170,7 @@ void load_command_list(const char *prefix,
 
 	if (exec_path) {
 		list_commands_in_dir(main_cmds, exec_path, prefix);
-		qsort(main_cmds->names, main_cmds->cnt,
-		      sizeof(*main_cmds->names), cmdname_compare);
+		QSORT(main_cmds->names, main_cmds->cnt, cmdname_compare);
 		uniq(main_cmds);
 	}
 
@@ -190,8 +189,7 @@ void load_command_list(const char *prefix,
 		}
 		free(paths);
 
-		qsort(other_cmds->names, other_cmds->cnt,
-		      sizeof(*other_cmds->names), cmdname_compare);
+		QSORT(other_cmds->names, other_cmds->cnt, cmdname_compare);
 		uniq(other_cmds);
 	}
 	exclude_cmds(other_cmds, main_cmds);
@@ -238,8 +236,7 @@ void list_common_cmds_help(void)
 			longest = strlen(common_cmds[i].name);
 	}
 
-	qsort(common_cmds, ARRAY_SIZE(common_cmds),
-		sizeof(common_cmds[0]), cmd_group_cmp);
+	QSORT(common_cmds, ARRAY_SIZE(common_cmds), cmd_group_cmp);
 
 	puts(_("These are common Git commands used in various situations:"));
 
@@ -324,8 +321,7 @@ const char *help_unknown_cmd(const char *cmd)
 
 	add_cmd_list(&main_cmds, &aliases);
 	add_cmd_list(&main_cmds, &other_cmds);
-	qsort(main_cmds.names, main_cmds.cnt,
-	      sizeof(*main_cmds.names), cmdname_compare);
+	QSORT(main_cmds.names, main_cmds.cnt, cmdname_compare);
 	uniq(&main_cmds);
 
 	/* This abuses cmdname->len for levenshtein distance */
@@ -359,8 +355,7 @@ const char *help_unknown_cmd(const char *cmd)
 			levenshtein(cmd, candidate, 0, 2, 1, 3) + 1;
 	}
 
-	qsort(main_cmds.names, main_cmds.cnt,
-	      sizeof(*main_cmds.names), levenshtein_compare);
+	QSORT(main_cmds.names, main_cmds.cnt, levenshtein_compare);
 
 	if (!main_cmds.cnt)
 		die(_("Uh oh. Your system reports no Git commands at all."));

line-log.c

@@ -113,7 +113,7 @@ void sort_and_merge_range_set(struct range_set *rs)
 	int i;
 	int o = 0; /* output cursor */
 
-	qsort(rs->ranges, rs->nr, sizeof(struct range), range_cmp);
+	QSORT(rs->ranges, rs->nr, range_cmp);
 
 	for (i = 0; i < rs->nr; i++) {
 		if (rs->ranges[i].start == rs->ranges[i].end)

pack-bitmap-write.c

@@ -385,8 +385,7 @@ void bitmap_writer_select_commits(struct commit **indexed_commits,
 {
 	unsigned int i = 0, j, next;
 
-	qsort(indexed_commits, indexed_commits_nr, sizeof(indexed_commits[0]),
-	      date_compare);
+	QSORT(indexed_commits, indexed_commits_nr, date_compare);
 
 	if (writer.show_progress)
 		writer.progress = start_progress("Selecting bitmap commits", 0);