1 files changed, 122 insertions, 0 deletions
diff --git a/libelf/elf_strptr.c b/libelf/elf_strptr.c
new file mode 100644
index 00000000..327adfd1
--- /dev/null
+++ b/libelf/elf_strptr.c
@@ -0,0 +1,122 @@
+/* Return string pointer from string section.
+   Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004 Red Hat, Inc.
+   Contributed by Ulrich Drepper <drepper@redhat.com>, 1998.
+
+   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, version 2.
+
+   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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <libelf.h>
+#include <stddef.h>
+
+#include "libelfP.h"
+
+
+char *
+elf_strptr (elf, idx, offset)
+     Elf *elf;
+     size_t idx;
+     size_t offset;
+{
+  if (elf == NULL)
+    return NULL;
+
+  if (elf->kind != ELF_K_ELF)
+    {
+      __libelf_seterrno (ELF_E_INVALID_HANDLE);
+      return NULL;
+    }
+
+  rwlock_rdlock (elf->lock);
+
+  char *result = NULL;
+  Elf_Scn *strscn;
+
+  /* Find the section in the list.  */
+  Elf_ScnList *runp = (elf->class == ELFCLASS32
+		       || (offsetof (struct Elf, state.elf32.scns)
+			   == offsetof (struct Elf, state.elf64.scns))
+		       ? &elf->state.elf32.scns : &elf->state.elf64.scns);
+  while (1)
+    {
+      if (idx < runp->max)
+	{
+	  if (idx < runp->cnt)
+	    strscn = &runp->data[idx];
+	  else
+	    {
+	      __libelf_seterrno (ELF_E_INVALID_INDEX);
+	      goto out;
+	    }
+	  break;
+	}
+
+      idx -= runp->max;
+
+      runp = runp->next;
+      if (runp == NULL)
+	{
+	  __libelf_seterrno (ELF_E_INVALID_INDEX);
+	  goto out;
+	}
+    }
+
+  if (elf->class == ELFCLASS32)
+    {
+      if (unlikely (strscn->shdr.e32->sh_type != SHT_STRTAB))
+	{
+	  /* This is no string section.  */
+	  __libelf_seterrno (ELF_E_INVALID_SECTION);
+	  goto out;
+	}
+
+      if (unlikely (offset >= strscn->shdr.e32->sh_size))
+	{
+	  /* The given offset is too big, it is beyond this section.  */
+	  __libelf_seterrno (ELF_E_OFFSET_RANGE);
+	  goto out;
+	}
+    }
+  else
+    {
+      if (unlikely (strscn->shdr.e64->sh_type != SHT_STRTAB))
+	{
+	  /* This is no string section.  */
+	  __libelf_seterrno (ELF_E_INVALID_SECTION);
+	  goto out;
+	}
+
+      if (unlikely (offset >= strscn->shdr.e64->sh_size))
+	{
+	  /* The given offset is too big, it is beyond this section.  */
+	  __libelf_seterrno (ELF_E_OFFSET_RANGE);
+	  goto out;
+	}
+    }
+
+  if (strscn->rawdata_base == NULL
+      /* Read the section data.  */
+      && __libelf_set_rawdata (strscn) != 0)
+    goto out;
+
+  result = &strscn->rawdata_base[offset];
+
+ out:
+  rwlock_unlock (elf->lock);
+
+  return result;
+}
+INTDEF(elf_strptr)