str: New function ss_swap().

[pspp] / src / libpspp / str.c

diff --git a/src/libpspp/str.c b/src/libpspp/str.c
index 99602fba681e699146f2ddb4922b2e90ac1caadc..86e7fd9199a5b9e22fba9fa2ac2eec4e9e7ff1c7 100644 (file)
--- a/src/libpspp/str.c
+++ b/src/libpspp/str.c
@@ -425,6 +425,15 @@ ss_dealloc (struct substring *ss)
   free (ss->string);
 }
 
+/* Exchanges the contents of A and B. */
+void
+ss_swap (struct substring *a, struct substring *b)
+{
+  struct substring tmp = *a;
+  *a = *b;
+  *b = tmp;
+}
+
 /* Truncates SS to at most CNT bytes in length. */
 void
 ss_truncate (struct substring *ss, size_t cnt)