Merge branch 'fc/apply-p2-get-header-name' into maint

* fc/apply-p2-get-header-name:
  test: git-apply -p2 rename/chmod only
  Fix git-apply with -p greater than 1

builtin/apply.c

@@ -942,28 +942,28 @@ static int gitdiff_newfile(const char *line, struct patch *patch)
 static int gitdiff_copysrc(const char *line, struct patch *patch)
 {
 	patch->is_copy = 1;
-	patch->old_name = find_name(line, NULL, 0, 0);
+	patch->old_name = find_name(line, NULL, p_value ? p_value - 1 : 0, 0);
 	return 0;
 }
 
 static int gitdiff_copydst(const char *line, struct patch *patch)
 {
 	patch->is_copy = 1;
-	patch->new_name = find_name(line, NULL, 0, 0);
+	patch->new_name = find_name(line, NULL, p_value ? p_value - 1 : 0, 0);
 	return 0;
 }
 
 static int gitdiff_renamesrc(const char *line, struct patch *patch)
 {
 	patch->is_rename = 1;
-	patch->old_name = find_name(line, NULL, 0, 0);
+	patch->old_name = find_name(line, NULL, p_value ? p_value - 1 : 0, 0);
 	return 0;
 }
 
 static int gitdiff_renamedst(const char *line, struct patch *patch)
 {
 	patch->is_rename = 1;
-	patch->new_name = find_name(line, NULL, 0, 0);
+	patch->new_name = find_name(line, NULL, p_value ? p_value - 1 : 0, 0);
 	return 0;
 }
 
@@ -1048,7 +1048,7 @@ static char *git_header_name(char *line, int llen)
 {
 	const char *name;
 	const char *second = NULL;
-	size_t len;
+	size_t len, line_len;
 
 	line += strlen("diff --git ");
 	llen -= strlen("diff --git ");
@@ -1148,6 +1148,10 @@ static char *git_header_name(char *line, int llen)
 	 * Accept a name only if it shows up twice, exactly the same
 	 * form.
 	 */
+	second = strchr(name, '\n');
+	if (!second)
+		return NULL;
+	line_len = second - name;
 	for (len = 0 ; ; len++) {
 		switch (name[len]) {
 		default:
@@ -1155,15 +1159,11 @@ static char *git_header_name(char *line, int llen)
 		case '\n':
 			return NULL;
 		case '\t': case ' ':
-			second = name+len;
-			for (;;) {
-				char c = *second++;
-				if (c == '\n')
-					return NULL;
-				if (c == '/')
-					break;
-			}
-			if (second[len] == '\n' && !memcmp(name, second, len)) {
+			second = stop_at_slash(name + len, line_len - len);
+			if (!second)
+				return NULL;
+			second++;
+			if (second[len] == '\n' && !strncmp(name, second, len)) {
 				return xmemdupz(name, len);
 			}
 		}

t/t4120-apply-popt.sh

@@ -56,4 +56,30 @@ test_expect_success 'apply with too large -p and fancy filename' '
 	grep "removing 3 leading" err
 '
 
+test_expect_success 'apply (-p2) diff, mode change only' '
+	cat >patch.chmod <<-\EOF &&
+	diff --git a/sub/file1 b/sub/file1
+	old mode 100644
+	new mode 100755
+	EOF
+	chmod 644 file1 &&
+	git apply -p2 patch.chmod &&
+	test -x file1
+'
+
+test_expect_success 'apply (-p2) diff, rename' '
+	cat >patch.rename <<-\EOF &&
+	diff --git a/sub/file1 b/sub/file2
+	similarity index 100%
+	rename from sub/file1
+	rename to sub/file2
+	EOF
+	echo A >expected &&
+
+	cp file1.saved file1 &&
+	rm -f file2 &&
+	git apply -p2 patch.rename &&
+	test_cmp expected file2
+'
+
 test_done