path: add mp_path_is_absolute()

Just move it from mp_path_join_bstr() to this new function.

2 files changed, 21 insertions, 10 deletions

diff --git a/options/path.c b/options/path.c
index a17d8b4325..9c996ce664 100644
--- a/options/path.c
+++ b/options/path.c
@@ -254,23 +254,31 @@ char *mp_splitext(const char *path, bstr *root)
     return (char *)split + 1;
 }
 
-char *mp_path_join_bstr(void *talloc_ctx, struct bstr p1, struct bstr p2)
+bool mp_path_is_absolute(struct bstr path)
 {
-    if (p1.len == 0)
-        return bstrdup0(talloc_ctx, p2);
-    if (p2.len == 0)
-        return bstrdup0(talloc_ctx, p1);
+    if (path.len && strchr(mp_path_separators, path.start[0]))
+        return true;
 
-    bool is_absolute = strchr(mp_path_separators, p2.start[0]);
 #if HAVE_DOS_PATHS
     // Note: "X:filename" is a path relative to the current working directory
     //       of drive X, and thus is not an absolute path. It needs to be
     //       followed by \ or /.
-    if (p2.len >= 3 && p2.start[1] == ':' &&
-        strchr(mp_path_separators, p2.start[2]))
-        is_absolute = true;
+    if (path.len >= 3 && path.start[1] == ':' &&
+        strchr(mp_path_separators, path.start[2]))
+        return true;
 #endif
-    if (is_absolute)
+
+    return false;
+}
+
+char *mp_path_join_bstr(void *talloc_ctx, struct bstr p1, struct bstr p2)
+{
+    if (p1.len == 0)
+        return bstrdup0(talloc_ctx, p2);
+    if (p2.len == 0)
+        return bstrdup0(talloc_ctx, p1);
+
+    if (mp_path_is_absolute(p2))
         return bstrdup0(talloc_ctx, p2);
 
     bool have_separator = strchr(mp_path_separators, p1.start[p1.len - 1]);
diff --git a/options/path.h b/options/path.h
index c3c3699a0b..19f4fb5909 100644
--- a/options/path.h
+++ b/options/path.h
@@ -77,6 +77,9 @@ void mp_path_strip_trailing_separator(char *path);
 char *mp_path_join(void *talloc_ctx, const char *p1, const char *p2);
 char *mp_path_join_bstr(void *talloc_ctx, struct bstr p1, struct bstr p2);
 
+// Return whether the path is absolute.
+bool mp_path_is_absolute(struct bstr path);
+
 char *mp_getcwd(void *talloc_ctx);
 
 bool mp_path_exists(const char *path);