util/error: allow non-NUL-terminated err->src

Rust makes the current file available as a statically-allocated string,
but without a NUL terminator.  Allow this by storing an optional maximum
length in the Error.

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/include/qapi/error-internal.h b/include/qapi/error-internal.h
index d5c3904ade..1ec3ceb40f 100644
--- a/include/qapi/error-internal.h
+++ b/include/qapi/error-internal.h
@@ -18,7 +18,14 @@ struct Error
 {
     char *msg;
     ErrorClass err_class;
-    const char *src, *func;
+    const char *func;
+
+    /*
+     * src might be NUL-terminated or not.  If it is, src_len is negative.
+     * If it is not, src_len is the length.
+     */
+    const char *src;
+    int src_len;
     int line;
     GString *hint;
 };