ui-shared: avoid memrchr(), a GNU extension

memrchr() is not in POSIX and is missing on macOS, where it breaks the
build of cgit_set_title_from_path(). Scan backwards for the separator by
hand instead; the path components handed to this function are short
enough that the difference does not matter.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/ui-shared.c b/ui-shared.c
index df52a9b..27a60ac 100644
--- a/ui-shared.c
+++ b/ui-shared.c
@@ -1255,9 +1255,18 @@ void cgit_set_title_from_path(const char *path)
 	if (!path)
 		return;
 
-	for (last_slash = path + strlen(path); (slash = memrchr(path, '/', last_slash - path)) != NULL; last_slash = slash) {
+	/* memrchr() is a GNU extension, so find the last '/' by hand. */
+	last_slash = path + strlen(path);
+	for (;;) {
+		slash = last_slash;
+		while (slash > path && slash[-1] != '/')
+			slash--;
+		if (slash == path)
+			break;
+		slash--;
 		strbuf_add(&sb, slash + 1, last_slash - slash - 1);
 		strbuf_addstr(&sb, " \xc2\xab ");
+		last_slash = slash;
 	}
 	strbuf_add(&sb, path, last_slash - path);
 	strbuf_addf(&sb, " - %s", ctx.page.title);