maint: modernize/clean-up a small function in ls.c

* src/ls.c (make_link_name): Adjust comment style to refer to VARIABLE
names, not 'variable'.
Move each of two declarations "down" to first use.
Compare pointer to NULL, not to 0.
Don't reuse local, "linkbuf" for a different purpose.

diff --git a/src/ls.c b/src/ls.c
index f1dfb1e..db58192 100644 (file)
--- a/src/ls.c
+++ b/src/ls.c
@@ -3193,17 +3193,14 @@ get_link_name (char const *filename, struct fileinfo *f, bool command_line_arg)
                   filename);
 }
 
-/* If 'linkname' is a relative name and 'name' contains one or more
-   leading directories, return 'linkname' with those directories
-   prepended; otherwise, return a copy of 'linkname'.
-   If 'linkname' is zero, return zero.  */
+/* If LINKNAME is a relative name and NAME contains one or more
+   leading directories, return LINKNAME with those directories
+   prepended; otherwise, return a copy of LINKNAME.
+   If LINKNAME is NULL, return NULL.  */
 
 static char *
 make_link_name (char const *name, char const *linkname)
 {
-  char *linkbuf;
-  size_t bufsiz;
-
   if (!linkname)
     return NULL;
 
@@ -3212,15 +3209,15 @@ make_link_name (char const *name, char const *linkname)
 
   /* The link is to a relative name.  Prepend any leading directory
      in 'name' to the link name.  */
-  linkbuf = strrchr (name, '/');
-  if (linkbuf == 0)
+  char const *linkbuf = strrchr (name, '/');
+  if (linkbuf == NULL)
     return xstrdup (linkname);
 
-  bufsiz = linkbuf - name + 1;
-  linkbuf = xmalloc (bufsiz + strlen (linkname) + 1);
-  strncpy (linkbuf, name, bufsiz);
-  strcpy (linkbuf + bufsiz, linkname);
-  return linkbuf;
+  size_t bufsiz = linkbuf - name + 1;
+  char *p = xmalloc (bufsiz + strlen (linkname) + 1);
+  strncpy (p, name, bufsiz);
+  strcpy (p + bufsiz, linkname);
+  return p;
 }
 
 /* Return true if the last component of NAME is '.' or '..'