posix.cfg: Added partial support for scandir() and a TODO comment.

cfg/posix.cfg

@@ -4026,6 +4026,32 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
       <not-bool/>
     </arg>
   </function>
+  <!-- http://man7.org/linux/man-pages/man3/scandir.3.html -->
+  <!-- int scandir(const char *dirp, 
+                    struct dirent ***namelist,
+                    int (*filter)(const struct dirent *),
+                    int (*compar)(const struct dirent **, const struct dirent **));-->
+  <function name="scandir">
+    <use-retval/>
+    <returnValue type="int"/>
+    <noreturn>false</noreturn>
+    <leak-ignore/>
+    <arg nr="1" direction="in">
+      <not-null/>
+      <not-uninit/>
+    </arg>
+    <arg nr="2" direction="out">
+      <not-null/>
+    </arg>
+    <arg nr="3" direction="in">
+      <not-uninit/>
+    </arg>
+    <arg nr="4" direction="in">
+      <not-uninit/>
+      <not-null/>
+      <not-bool/>
+    </arg>
+  </function>
   <!-- http://man7.org/linux/man-pages/man3/fileno.3p.html -->
   <!-- int fileno(FILE *stream); -->
   <function name="fileno">
@@ -4863,6 +4889,10 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
     <alloc init="false" arg="1">posix_memalign</alloc>
     <dealloc>free</dealloc>
   </memory>
+  <memory>
+    <alloc init="false" arg="2">scandir</alloc>
+    <dealloc>free</dealloc>
+  </memory>
   <memory>
     <alloc init="true" buffer-size="strdup">strdup</alloc>
     <alloc init="true">strndup</alloc>

test/cfg/posix.c

@@ -21,6 +21,38 @@
 #include <unistd.h>
 #include <pthread.h>
 
+void memleak_scandir(void)
+{
+    struct dirent **namelist;
+    int n = scandir(".", &namelist, NULL, alphasort);
+    if (n == -1) {
+        return;
+    }
+
+    // http://man7.org/linux/man-pages/man3/scandir.3.html
+    /* The scandir() function scans the directory dirp, calling filter() on
+       each directory entry.  Entries for which filter() returns nonzero are
+       stored in strings allocated via malloc(3), sorted using qsort(3) with
+       the comparison function compar(), and collected in array namelist
+       which is allocated via malloc(3).  If filter is NULL, all entries are
+       selected.*/
+
+    // TODO: cppcheck-suppress memleak
+}
+
+void no_memleak_scandir(void)
+{
+    struct dirent **namelist;
+    int n = scandir(".", &namelist, NULL, alphasort);
+    if (n == -1) {
+        return;
+    }
+    while (n--) {
+        free(namelist[n]);
+    }
+    free(namelist);
+}
+
 void validCode()
 {
     void *ptr;