From: Ben Pfaff <blp@cs.stanford.edu>
Date: Sun, 18 Jul 2021 21:20:06 +0000 (-0700)
Subject: str: New function ss_swap().
X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=61d50bb6faca2b65483ee1eac6a214a5a1263a13;p=pspp

str: New function ss_swap().
---

diff --git a/src/libpspp/str.c b/src/libpspp/str.c
index 99602fba68..86e7fd9199 100644
--- 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)
diff --git a/src/libpspp/str.h b/src/libpspp/str.h
index 57783e0ea5..8cde577914 100644
--- a/src/libpspp/str.h
+++ b/src/libpspp/str.h
@@ -103,6 +103,7 @@ void ss_dealloc (struct substring *);
 /* Mutators.
    Functions that advance the beginning of a string should not be
    used if a substring is to be deallocated. */
+void ss_swap (struct substring *, struct substring *);
 void ss_truncate (struct substring *, size_t);
 size_t ss_rtrim (struct substring *, struct substring trim_set);
 size_t ss_ltrim (struct substring *, struct substring trim_set);