1 files changed, 165 insertions, 0 deletions
diff --git a/grub-core/script/argv.c b/grub-core/script/argv.c
new file mode 100644
index 0000000..5751fdd
--- /dev/null
+++ b/grub-core/script/argv.c
@@ -0,0 +1,165 @@
+/* argv.c - methods for constructing argument vector */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2010  Free Software Foundation, Inc.
+ *
+ *  GRUB 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 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/mm.h>
+#include <grub/misc.h>
+#include <grub/script_sh.h>
+#include <grub/safemath.h>
+
+/* Return nearest power of two that is >= v.  */
+static unsigned
+round_up_exp (unsigned v)
+{
+  COMPILE_TIME_ASSERT (sizeof (v) == 4);
+
+  v--;
+  v |= v >> 1;
+  v |= v >> 2;
+  v |= v >> 4;
+  v |= v >> 8;
+  v |= v >> 16;
+
+  v++;
+  v += (v == 0);
+
+  return v;
+}
+
+void
+grub_script_argv_free (struct grub_script_argv *argv)
+{
+  unsigned i;
+
+  if (argv->args)
+    {
+      for (i = 0; i < argv->argc; i++)
+	grub_free (argv->args[i]);
+
+      grub_free (argv->args);
+    }
+
+  argv->argc = 0;
+  argv->args = 0;
+  argv->script = 0;
+}
+
+/* Make argv from argc, args pair.  */
+int
+grub_script_argv_make (struct grub_script_argv *argv, int argc, char **args)
+{
+  int i;
+  struct grub_script_argv r = { 0, 0, 0 };
+
+  for (i = 0; i < argc; i++)
+    if (grub_script_argv_next (&r)
+	|| grub_script_argv_append (&r, args[i], grub_strlen (args[i])))
+      {
+	grub_script_argv_free (&r);
+	return 1;
+      }
+  *argv = r;
+  return 0;
+}
+
+/* Prepare for next argc.  */
+int
+grub_script_argv_next (struct grub_script_argv *argv)
+{
+  char **p = argv->args;
+  grub_size_t sz;
+
+  if (argv->args && argv->argc && argv->args[argv->argc - 1] == 0)
+    return 0;
+
+  if (grub_add (argv->argc, 2, &sz) ||
+      grub_mul (sz, sizeof (char *), &sz))
+    return 1;
+
+  p = grub_realloc (p, round_up_exp (sz));
+  if (! p)
+    return 1;
+
+  argv->argc++;
+  argv->args = p;
+
+  if (argv->argc == 1)
+    argv->args[0] = 0;
+  argv->args[argv->argc] = 0;
+  return 0;
+}
+
+/* Append `s' to the last argument.  */
+int
+grub_script_argv_append (struct grub_script_argv *argv, const char *s,
+			 grub_size_t slen)
+{
+  grub_size_t a;
+  char *p = argv->args[argv->argc - 1];
+  grub_size_t sz;
+
+  if (! s)
+    return 0;
+
+  a = p ? grub_strlen (p) : 0;
+
+  if (grub_add (a, slen, &sz) ||
+      grub_add (sz, 1, &sz) ||
+      grub_mul (sz, sizeof (char), &sz))
+    return 1;
+
+  p = grub_realloc (p, round_up_exp (sz));
+  if (! p)
+    return 1;
+
+  grub_memcpy (p + a, s, slen);
+  p[a+slen] = 0;
+  argv->args[argv->argc - 1] = p;
+
+  return 0;
+}
+
+/* Split `s' and append words as multiple arguments.  */
+int
+grub_script_argv_split_append (struct grub_script_argv *argv, const char *s)
+{
+  const char *p;
+  int errors = 0;
+
+  if (! s)
+    return 0;
+
+  while (*s && grub_isspace (*s))
+    s++;
+
+  while (! errors && *s)
+    {
+      p = s;
+      while (*s && ! grub_isspace (*s))
+	s++;
+
+      errors += grub_script_argv_append (argv, p, s - p);
+
+      while (*s && grub_isspace (*s))
+	s++;
+
+      if (*s)
+	errors += grub_script_argv_next (argv);
+    }
+  return errors;
+}