strlen+malloc+snprintf is error prone;

rewrite post_lb() to use asprintf(3) instead

diff --git a/mdoc_validate.c b/mdoc_validate.c
index 63474bd3ba7ab8c9d8ef45f90a9d216a49100b58..55573fa8c9f9a1384f9796cded1f671b17a1df49 100644 (file)
--- a/mdoc_validate.c
+++ b/mdoc_validate.c
@@ -1,4 +1,4 @@
-/*     $Id: mdoc_validate.c,v 1.211 2014/04/20 19:40:13 schwarze Exp $ */
+/*     $Id: mdoc_validate.c,v 1.212 2014/04/20 20:48:53 schwarze Exp $ */
 /*
  * Copyright (c) 2008-2012 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2010-2014 Ingo Schwarze <schwarze@openbsd.org>
@@ -1044,34 +1044,25 @@ post_bf(POST_ARGS)
 static int
 post_lb(POST_ARGS)
 {
-       const char      *p;
-       char            *buf;
-       size_t           sz;
+       struct mdoc_node        *n;
+       const char              *stdlibname;
+       char                    *libname;
 
        check_count(mdoc, MDOC_ELEM, CHECK_WARN, CHECK_EQ, 1);
 
-       assert(mdoc->last->child);
-       assert(MDOC_TEXT == mdoc->last->child->type);
-
-       p = mdoc_a2lib(mdoc->last->child->string);
-
-       /* If lookup ok, replace with table value. */
+       n = mdoc->last->child;
 
-       if (p) {
-               free(mdoc->last->child->string);
-               mdoc->last->child->string = mandoc_strdup(p);
-               return(1);
-       }
+       assert(n);
+       assert(MDOC_TEXT == n->type);
 
-       /* If not, use "library ``xxxx''. */
+       if (NULL == (stdlibname = mdoc_a2lib(n->string)))
+               mandoc_asprintf(&libname,
+                   "library \\(lq%s\\(rq", n->string);
+       else
+               libname = mandoc_strdup(stdlibname);
 
-       sz = strlen(mdoc->last->child->string) + 2 +
-            strlen("\\(lqlibrary\\(rq");
-       buf = mandoc_malloc(sz);
-       snprintf(buf, sz, "library \\(lq%s\\(rq",
-           mdoc->last->child->string);
-       free(mdoc->last->child->string);
-       mdoc->last->child->string = buf;
+       free(n->string);
+       n->string = libname;
        return(1);
 }