Tests for module 'snprintf'.

[gnulib.git] / tests / test-snprintf.c

diff --git a/tests/test-snprintf.c b/tests/test-snprintf.c
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+/* Test of snprintf() function.
+   Copyright (C) 2007 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <stdio.h>
+
+#include <stdlib.h>
+#include <string.h>
+
+#define ASSERT(expr) if (!(expr)) abort ();
+
+int
+main (int argc, char *argv[])
+{
+  char buf[8];
+  int size;
+  int retval;
+
+  for (size = 0; size <= 8; size++)
+    {
+      memcpy (buf, "DEADBEEF", 8);
+      retval = snprintf (buf, size, "%d", 12345);
+      if (size < 6)
+       {
+         ASSERT (retval < 0 || retval >= size);
+         if (size > 0)
+           {
+             ASSERT (memcmp (buf, "12345", size - 1) == 0);
+             ASSERT (buf[size - 1] == '\0' || buf[size - 1] == '0' + size);
+           }
+         ASSERT (memcmp (buf + size, "DEADBEEF" + size, 8 - size) == 0);
+       }
+      else
+       {
+         ASSERT (retval == 5);
+         ASSERT (memcmp (buf, "12345\0EF", 8) == 0);
+       }
+    }
+
+  return 0;
+}