reftable/refname: refactor binary search over refnames

It is comparatively hard to understand how exactly the binary search
over refnames works given that the function and variable names are not
exactly easy to grasp. Rename them to make this more obvious. This
should not result in any change in behaviour.

Signed-off-by: Patrick Steinhardt <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: pks-t

reftable/refname.c

@@ -12,15 +12,15 @@
 #include "refname.h"
 #include "reftable-iterator.h"
 
-struct find_arg {
-	char **names;
-	const char *want;
+struct refname_needle_lesseq_args {
+	char **haystack;
+	const char *needle;
 };
 
-static int find_name(size_t k, void *arg)
+static int refname_needle_lesseq(size_t k, void *_args)
 {
-	struct find_arg *f_arg = arg;
-	return strcmp(f_arg->names[k], f_arg->want) >= 0;
+	struct refname_needle_lesseq_args *args = _args;
+	return strcmp(args->needle, args->haystack[k]) <= 0;
 }
 
 static int modification_has_ref(struct modification *mod, const char *name)
@@ -29,21 +29,21 @@ static int modification_has_ref(struct modification *mod, const char *name)
 	int err = 0;
 
 	if (mod->add_len > 0) {
-		struct find_arg arg = {
-			.names = mod->add,
-			.want = name,
+		struct refname_needle_lesseq_args args = {
+			.haystack = mod->add,
+			.needle = name,
 		};
-		size_t idx = binsearch(mod->add_len, find_name, &arg);
+		size_t idx = binsearch(mod->add_len, refname_needle_lesseq, &args);
 		if (idx < mod->add_len && !strcmp(mod->add[idx], name))
 			return 0;
 	}
 
 	if (mod->del_len > 0) {
-		struct find_arg arg = {
-			.names = mod->del,
-			.want = name,
+		struct refname_needle_lesseq_args args = {
+			.haystack = mod->del,
+			.needle = name,
 		};
-		size_t idx = binsearch(mod->del_len, find_name, &arg);
+		size_t idx = binsearch(mod->del_len, refname_needle_lesseq, &args);
 		if (idx < mod->del_len && !strcmp(mod->del[idx], name))
 			return 1;
 	}
@@ -71,11 +71,11 @@ static int modification_has_ref_with_prefix(struct modification *mod,
 	int err = 0;
 
 	if (mod->add_len > 0) {
-		struct find_arg arg = {
-			.names = mod->add,
-			.want = prefix,
+		struct refname_needle_lesseq_args args = {
+			.haystack = mod->add,
+			.needle = prefix,
 		};
-		size_t idx = binsearch(mod->add_len, find_name, &arg);
+		size_t idx = binsearch(mod->add_len, refname_needle_lesseq, &args);
 		if (idx < mod->add_len &&
 		    !strncmp(prefix, mod->add[idx], strlen(prefix)))
 			goto done;
@@ -90,11 +90,11 @@ static int modification_has_ref_with_prefix(struct modification *mod,
 			goto done;
 
 		if (mod->del_len > 0) {
-			struct find_arg arg = {
-				.names = mod->del,
-				.want = ref.refname,
+			struct refname_needle_lesseq_args args = {
+				.haystack = mod->del,
+				.needle = ref.refname,
 			};
-			size_t idx = binsearch(mod->del_len, find_name, &arg);
+			size_t idx = binsearch(mod->del_len, refname_needle_lesseq, &args);
 			if (idx < mod->del_len &&
 			    !strcmp(ref.refname, mod->del[idx]))
 				continue;