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/* Copyright (C) 2002, 2005 by  Red Hat, Incorporated. All rights reserved.

 *

 * Permission to use, copy, modify, and distribute this software

 * is freely granted, provided that this notice is preserved.

 */

#include <errno.h>

#include <sys/types.h>

#include <string.h>

#include <stdlib.h>

#include <argz.h>

#define __need_ptrdiff_t

#include <stddef.h>

error_t

_DEFUN (argz_insert, (argz, argz_len, before, entry),

       char **argz _AND

       size_t *argz_len _AND

       char *before _AND

       const char *entry)

{

  int len = 0;

  ptrdiff_t delta;

  if (before == NULL)

    return argz_add(argz, argz_len, entry);

  if (before < *argz || before >= *argz + *argz_len)

    return EINVAL;

  while (before != *argz && before[-1])

    before--;

  /* delta will always be non-negative, and < *argz_len */

  delta = before - *argz;

  len = strlen(entry) + 1;

  if(!(*argz = (char *)realloc(*argz, *argz_len + len)))

    return ENOMEM;

  memmove(*argz + delta + len, *argz + delta,  *argz_len - delta);

  memcpy(*argz + delta, entry, len);

  *argz_len += len;

  return 0;

}