give "nbuf" strbuf a more meaningful name

It's a common pattern in our code to read paths from stdin,
separated either by newlines or NULs, and unquote as
necessary. In each of these five cases we use "nbuf" to
temporarily store the unquoted value. Let's give it the more
meaningful name "unquoted", which makes it easier to
understand the purpose of the variable.

While we're at it, let's also static-initialize all of our
strbufs. It's not wrong to call strbuf_init, but it
increases the cognitive load on the reader, who might wonder
"do we sometimes avoid initializing them?  why?".

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/check-attr.c

@@ -72,24 +72,23 @@ static void check_attr(const char *prefix, int cnt,
 static void check_attr_stdin_paths(const char *prefix, int cnt,
 	struct git_attr_check *check)
 {
-	struct strbuf buf, nbuf;
+	struct strbuf buf = STRBUF_INIT;
+	struct strbuf unquoted = STRBUF_INIT;
 	strbuf_getline_fn getline_fn;
 
 	getline_fn = nul_term_line ? strbuf_getline_nul : strbuf_getline_lf;
-	strbuf_init(&buf, 0);
-	strbuf_init(&nbuf, 0);
 	while (getline_fn(&buf, stdin) != EOF) {
 		if (!nul_term_line && buf.buf[0] == '"') {
-			strbuf_reset(&nbuf);
-			if (unquote_c_style(&nbuf, buf.buf, NULL))
+			strbuf_reset(&unquoted);
+			if (unquote_c_style(&unquoted, buf.buf, NULL))
 				die("line is badly quoted");
-			strbuf_swap(&buf, &nbuf);
+			strbuf_swap(&buf, &unquoted);
 		}
 		check_attr(prefix, cnt, check, buf.buf);
 		maybe_flush_or_die(stdout, "attribute to stdout");
 	}
 	strbuf_release(&buf);
-	strbuf_release(&nbuf);
+	strbuf_release(&unquoted);
 }
 
 static NORETURN void error_with_usage(const char *msg)

builtin/check-ignore.c

@@ -115,28 +115,27 @@ static int check_ignore(struct dir_struct *dir,
 
 static int check_ignore_stdin_paths(struct dir_struct *dir, const char *prefix)
 {
-	struct strbuf buf, nbuf;
+	struct strbuf buf = STRBUF_INIT;
+	struct strbuf unquoted = STRBUF_INIT;
 	char *pathspec[2] = { NULL, NULL };
 	strbuf_getline_fn getline_fn;
 	int num_ignored = 0;
 
 	getline_fn = nul_term_line ? strbuf_getline_nul : strbuf_getline_lf;
-	strbuf_init(&buf, 0);
-	strbuf_init(&nbuf, 0);
 	while (getline_fn(&buf, stdin) != EOF) {
 		if (!nul_term_line && buf.buf[0] == '"') {
-			strbuf_reset(&nbuf);
-			if (unquote_c_style(&nbuf, buf.buf, NULL))
+			strbuf_reset(&unquoted);
+			if (unquote_c_style(&unquoted, buf.buf, NULL))
 				die("line is badly quoted");
-			strbuf_swap(&buf, &nbuf);
+			strbuf_swap(&buf, &unquoted);
 		}
 		pathspec[0] = buf.buf;
 		num_ignored += check_ignore(dir, prefix,
 					    1, (const char **)pathspec);
 		maybe_flush_or_die(stdout, "check-ignore to stdout");
 	}
 	strbuf_release(&buf);
-	strbuf_release(&nbuf);
+	strbuf_release(&unquoted);
 	return num_ignored;
 }
 

builtin/checkout-index.c

@@ -251,7 +251,8 @@ int cmd_checkout_index(int argc, const char **argv, const char *prefix)
 	}
 
 	if (read_from_stdin) {
-		struct strbuf buf = STRBUF_INIT, nbuf = STRBUF_INIT;
+		struct strbuf buf = STRBUF_INIT;
+		struct strbuf unquoted = STRBUF_INIT;
 		strbuf_getline_fn getline_fn;
 
 		if (all)
@@ -261,16 +262,16 @@ int cmd_checkout_index(int argc, const char **argv, const char *prefix)
 		while (getline_fn(&buf, stdin) != EOF) {
 			char *p;
 			if (!nul_term_line && buf.buf[0] == '"') {
-				strbuf_reset(&nbuf);
-				if (unquote_c_style(&nbuf, buf.buf, NULL))
+				strbuf_reset(&unquoted);
+				if (unquote_c_style(&unquoted, buf.buf, NULL))
 					die("line is badly quoted");
-				strbuf_swap(&buf, &nbuf);
+				strbuf_swap(&buf, &unquoted);
 			}
 			p = prefix_path(prefix, prefix_length, buf.buf);
 			checkout_file(p, prefix);
 			free(p);
 		}
-		strbuf_release(&nbuf);
+		strbuf_release(&unquoted);
 		strbuf_release(&buf);
 	}
 

builtin/hash-object.c

@@ -58,20 +58,21 @@ static void hash_object(const char *path, const char *type, const char *vpath,
 static void hash_stdin_paths(const char *type, int no_filters, unsigned flags,
 			     int literally)
 {
-	struct strbuf buf = STRBUF_INIT, nbuf = STRBUF_INIT;
+	struct strbuf buf = STRBUF_INIT;
+	struct strbuf unquoted = STRBUF_INIT;
 
 	while (strbuf_getline_lf(&buf, stdin) != EOF) {
 		if (buf.buf[0] == '"') {
-			strbuf_reset(&nbuf);
-			if (unquote_c_style(&nbuf, buf.buf, NULL))
+			strbuf_reset(&unquoted);
+			if (unquote_c_style(&unquoted, buf.buf, NULL))
 				die("line is badly quoted");
-			strbuf_swap(&buf, &nbuf);
+			strbuf_swap(&buf, &unquoted);
 		}
 		hash_object(buf.buf, type, no_filters ? NULL : buf.buf, flags,
 			    literally);
 	}
 	strbuf_release(&buf);
-	strbuf_release(&nbuf);
+	strbuf_release(&unquoted);
 }
 
 int cmd_hash_object(int argc, const char **argv, const char *prefix)

builtin/update-index.c

@@ -1075,24 +1075,25 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
 	}
 
 	if (read_from_stdin) {
-		struct strbuf buf = STRBUF_INIT, nbuf = STRBUF_INIT;
+		struct strbuf buf = STRBUF_INIT;
+		struct strbuf unquoted = STRBUF_INIT;
 
 		setup_work_tree();
 		while (getline_fn(&buf, stdin) != EOF) {
 			char *p;
 			if (!nul_term_line && buf.buf[0] == '"') {
-				strbuf_reset(&nbuf);
-				if (unquote_c_style(&nbuf, buf.buf, NULL))
+				strbuf_reset(&unquoted);
+				if (unquote_c_style(&unquoted, buf.buf, NULL))
 					die("line is badly quoted");
-				strbuf_swap(&buf, &nbuf);
+				strbuf_swap(&buf, &unquoted);
 			}
 			p = prefix_path(prefix, prefix_length, buf.buf);
 			update_one(p);
 			if (set_executable_bit)
 				chmod_path(set_executable_bit, p);
 			free(p);
 		}
-		strbuf_release(&nbuf);
+		strbuf_release(&unquoted);
 		strbuf_release(&buf);
 	}