Prefer tail calls.

* lib-src/ebrowse.c (xstrdup):
* lib-src/etags.c (savenstr):
* lwlib/lwlib.c (safe_strdup):
* src/xfns.c (xic_create_fontsetname):
* src/xrdb.c (gethomedir): Prefer tail calls.
* lib-src/etags.c (concat): Omit unnecessary assignment.

8 files changed, 21 insertions, 16 deletions

diff --git a/lib-src/ChangeLog b/lib-src/ChangeLog
index 44d7260dea..2010444743 100644
--- a/lib-src/ChangeLog
+++ b/lib-src/ChangeLog
@@ -1,3 +1,9 @@
+2013-11-14  Paul Eggert  <eggert@cs.ucla.edu>
+
+	* ebrowse.c (xstrdup):
+	* etags.c (savenstr): Prefer tail calls.
+	* etags.c (concat): Omit unnecessary assignment.
+
 2013-10-24  Glenn Morris  <rgm@gnu.org>
 
 	* Makefile.in ($(DESTDIR)${archlibdir}):
diff --git a/lib-src/ebrowse.c b/lib-src/ebrowse.c
index 216865c380..971f74e7fe 100644
--- a/lib-src/ebrowse.c
+++ b/lib-src/ebrowse.c
@@ -514,7 +514,7 @@ static char *
 xstrdup (char *s)
 {
   if (s)
-    s = strcpy (xmalloc (strlen (s) + 1), s);
+    return strcpy (xmalloc (strlen (s) + 1), s);
   return s;
 }
 
diff --git a/lib-src/etags.c b/lib-src/etags.c
index aa8c773e35..21cf3654b9 100644
--- a/lib-src/etags.c
+++ b/lib-src/etags.c
@@ -6243,12 +6243,9 @@ savestr (const char *cp)
 static char *
 savenstr (const char *cp, int len)
 {
-  register char *dp;
-
-  dp = xnew (len + 1, char);
-  memcpy (dp, cp, len);
+  char *dp = xnew (len + 1, char);
   dp[len] = '\0';
-  return dp;
+  return memcpy (dp, cp, len);
 }
 
 /*
@@ -6362,7 +6359,6 @@ concat (const char *s1, const char *s2, const char *s3)
   strcpy (result, s1);
   strcpy (result + len1, s2);
   strcpy (result + len1 + len2, s3);
-  result[len1 + len2 + len3] = '\0';
 
   return result;
 }
diff --git a/lwlib/ChangeLog b/lwlib/ChangeLog
index dadb13514e..e4ab1a91ca 100644
--- a/lwlib/ChangeLog
+++ b/lwlib/ChangeLog
@@ -1,3 +1,7 @@
+2013-11-14  Paul Eggert  <eggert@cs.ucla.edu>
+
+	* lwlib.c (safe_strdup): Prefer tail calls.
+
 2013-11-02  Glenn Morris  <rgm@gnu.org>
 
 	Use relative filenames in TAGS files.
diff --git a/lwlib/lwlib.c b/lwlib/lwlib.c
index 7d9920e8bc..c8eba9cf35 100644
--- a/lwlib/lwlib.c
+++ b/lwlib/lwlib.c
@@ -103,11 +103,7 @@ static void show_one_widget_busy (Widget, Boolean);
 char *
 safe_strdup (const char *s)
 {
-  char *result;
-  if (! s) return 0;
-  result = (char *) xmalloc (strlen (s) + 1);
-  strcpy (result, s);
-  return result;
+  return s ? xstrdup (s) : 0;
 }
 
 static void
diff --git a/src/ChangeLog b/src/ChangeLog
index 08bbe9e69d..3861449cf5 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,8 @@
+2013-11-14  Paul Eggert  <eggert@cs.ucla.edu>
+
+	* xfns.c (xic_create_fontsetname):
+	* xrdb.c (gethomedir): Prefer tail calls.
+
 2013-11-12  Paul Eggert  <eggert@cs.ucla.edu>
 
 	* xterm.c (syms_of_xterm): staticpro Qmodifier_value, Qalt, Qhyper,
diff --git a/src/xfns.c b/src/xfns.c
index 42e7c2eeec..46f377042f 100644
--- a/src/xfns.c
+++ b/src/xfns.c
@@ -1750,7 +1750,7 @@ xic_create_fontsetname (const char *base_fontname, int motif)
 	}
     }
   if (motif)
-    strcat (fontsetname, ":");
+    return strcat (fontsetname, ":");
   return fontsetname;
 }
 #endif /* HAVE_X_WINDOWS && USE_X_TOOLKIT */
diff --git a/src/xrdb.c b/src/xrdb.c
index 52988f0818..ea823b2b31 100644
--- a/src/xrdb.c
+++ b/src/xrdb.c
@@ -234,9 +234,7 @@ gethomedir (void)
 
   copy = xmalloc (strlen (ptr) + 2);
   strcpy (copy, ptr);
-  strcat (copy, "/");
-
-  return copy;
+  return strcat (copy, "/");
 }