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/* Copyright (C) 2002 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>

#include "buf_findstr.h"

error_t

_DEFUN (argz_replace, (argz, argz_len, str, with, replace_count),

       char **argz _AND

       size_t *argz_len _AND

       const char *str _AND

       const char *with _AND

       unsigned *replace_count)

{

  const int str_len = strlen(str);

  const int with_len = strlen(with);

  const int len_diff = with_len - str_len;

  char *buf_iter = *argz;

  size_t buf_len = *argz_len;

  char *last_iter = NULL;

  char *new_argz = NULL;

  size_t new_argz_len = 0;

  char *new_argz_iter = NULL;

  *replace_count = 0;

  new_argz_len = *argz_len;

  while(buf_len)

    {

      if(_buf_findstr(str, &buf_iter, &buf_len))

        {

          *replace_count += 1;

          new_argz_len += len_diff;

        }

    }

  if (*replace_count)

    {

      new_argz = (char *)malloc(new_argz_len);

      buf_iter = *argz;

      buf_len = *argz_len;

      last_iter = buf_iter;

      new_argz_iter = new_argz;

      while(buf_len)

        {

          if (_buf_findstr(str, &buf_iter, &buf_len))

            {

              /* copy everything up to, but not including str, from old argz to

                 new argz. */

              memcpy(new_argz_iter, last_iter, buf_iter - last_iter - str_len);

              new_argz_iter += (buf_iter - last_iter - str_len);

              /* copy replacement string. */

              memcpy(new_argz_iter, with, with_len);

              new_argz_iter += with_len;

              last_iter = buf_iter;

            }

        }

      /* copy everything after last occurrence of str. */

      memcpy(new_argz_iter, last_iter, *argz + *argz_len - last_iter);

      /* reallocate argz, and copy over the new value. */

      if(!(*argz = (char *)realloc(*argz, new_argz_len)))

        return ENOMEM;

      memcpy(*argz, new_argz, new_argz_len);

      *argz_len = new_argz_len;

      if (*argz_len == 0)

        {

          free(*argz);

          *argz = NULL;

        }

      free(new_argz);

    }

  return 0;

}