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[qemu.git] / block.c

diff --git a/block.c b/block.c
index 50ba2641430aef9c18b9f1070dd59a1ab3891654..fa1d06d84676f0f40c9119af8068f10d47d777f1 100644 (file)
--- a/block.c
+++ b/block.c
@@ -163,11 +163,16 @@ void path_combine(char *dest, int dest_size,
     if (path_is_absolute(filename)) {
         pstrcpy(dest, dest_size, filename);
     } else {
-        p = strchr(base_path, ':');
-        if (p)
-            p++;
-        else
-            p = base_path;
+        const char *protocol_stripped = NULL;
+
+        if (path_has_protocol(base_path)) {
+            protocol_stripped = strchr(base_path, ':');
+            if (protocol_stripped) {
+                protocol_stripped++;
+            }
+        }
+        p = protocol_stripped ?: base_path;
+
         p1 = strrchr(base_path, '/');
 #ifdef _WIN32
         {
@@ -192,6 +197,41 @@ void path_combine(char *dest, int dest_size,
     }
 }
 
+/*
+ * Helper function for bdrv_parse_filename() implementations to remove optional
+ * protocol prefixes (especially "file:") from a filename and for putting the
+ * stripped filename into the options QDict if there is such a prefix.
+ */
+void bdrv_parse_filename_strip_prefix(const char *filename, const char *prefix,
+                                      QDict *options)
+{
+    if (strstart(filename, prefix, &filename)) {
+        /* Stripping the explicit protocol prefix may result in a protocol
+         * prefix being (wrongly) detected (if the filename contains a colon) */
+        if (path_has_protocol(filename)) {
+            QString *fat_filename;
+
+            /* This means there is some colon before the first slash; therefore,
+             * this cannot be an absolute path */
+            assert(!path_is_absolute(filename));
+
+            /* And we can thus fix the protocol detection issue by prefixing it
+             * by "./" */
+            fat_filename = qstring_from_str("./");
+            qstring_append(fat_filename, filename);
+
+            assert(!path_has_protocol(qstring_get_str(fat_filename)));
+
+            qdict_put(options, "filename", fat_filename);
+        } else {
+            /* If no protocol prefix was detected, we can use the shortened
+             * filename as-is */
+            qdict_put_str(options, "filename", filename);
+        }
+    }
+}
+
+
 /* Returns whether the image file is opened as read-only. Note that this can
  * return false and writing to the image file is still not possible because the
  * image is inactivated. */