/* str-list.c: define routines for string lists.

    Copyright 1993, 2008 Karl Berry.
    Copyright 2001, 2005 Olaf Weber.

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library 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
    Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with this library; if not, see <http://www.gnu.org/licenses/>.  */

#include <kpathsea/config.h>

#include <kpathsea/str-list.h>


/* See the .h file for comments.  */


str_list_type
str_list_init (void)
{
  str_list_type ret;
  
  STR_LIST_LENGTH (ret) = 0;
  STR_LIST (ret) = NULL;
  
  return ret;
}


void
str_list_add (str_list_type *l,  string s)
{
  STR_LIST_LENGTH (*l)++;
  XRETALLOC (STR_LIST (*l), STR_LIST_LENGTH (*l), string);
  STR_LIST_LAST_ELT (*l) = s;
}


/* May as well save some reallocations and do everything in a chunk
   instead of calling str_list_add on each element.  */
   
void
str_list_concat (str_list_type *target,  str_list_type more)
{
  unsigned e;
  unsigned prev_len = STR_LIST_LENGTH (*target);

  STR_LIST_LENGTH (*target) += STR_LIST_LENGTH (more);
  XRETALLOC (STR_LIST (*target), STR_LIST_LENGTH (*target), string);
  
  for (e = 0; e < STR_LIST_LENGTH (more); e++)
    STR_LIST_ELT (*target, prev_len + e) = STR_LIST_ELT (more, e);
}


/* Concatenate the elements of more to each element of target.  This
   _must_ be done with the first index varying fastest. */
/* Note that we free the old elements of target as well. */

void
str_list_concat_elements (str_list_type *target,  str_list_type more)
{
    if (STR_LIST_LENGTH(more) == 0) {
        return;
    } else if (STR_LIST_LENGTH(*target) == 0) {
        unsigned int i;
        STR_LIST_LENGTH(*target) = STR_LIST_LENGTH(more);
        STR_LIST(*target) =
                (string*)xmalloc(STR_LIST_LENGTH(more)*sizeof(char*));
        for (i=0;i!=STR_LIST_LENGTH(more);++i) {
            STR_LIST_ELT(*target,i)=xstrdup(STR_LIST_ELT(more,i));
        }
        return;
    } else {
        unsigned new_len;
        char ** new_list;
        unsigned int i,j;
        new_list = (string*)xmalloc(STR_LIST_LENGTH (*target)
                                    * STR_LIST_LENGTH (more) * sizeof(char*));

        new_len = 0;
        for (j = 0; j != STR_LIST_LENGTH(more); ++j) {
            for (i = 0; i != STR_LIST_LENGTH(*target); ++i) {
                new_list[new_len] = concat(STR_LIST_ELT(*target,i),
                                           STR_LIST_ELT(more,j));
                ++new_len;
            }
        }
        for (i = 0; i != STR_LIST_LENGTH(*target); ++i)
            free(STR_LIST_ELT(*target, i));
        free(STR_LIST(*target));
        STR_LIST_LENGTH(*target) = new_len;
        STR_LIST(*target) = new_list;
    }
}


/* Free the list (but not the elements within it).  */

void
str_list_free (str_list_type *l)
{
  if (STR_LIST (*l))
    {
      free (STR_LIST (*l));
      STR_LIST (*l) = NULL;
    }
}



/* Remove duplicate elements from L, freeing their space.  Since our
   lists are so short, we do a maximally inefficient bubble search.  */

void
str_list_uniqify (str_list_type *l)
{
  unsigned e;
  str_list_type ret = str_list_init ();
  
  for (e = 0; e < STR_LIST_LENGTH (*l); e++) {
    string elt1 = STR_LIST_ELT (*l, e);
    unsigned f;
    for (f = e + 1; f < STR_LIST_LENGTH (*l); f++) {
      string elt2 = STR_LIST_ELT (*l, f);
      /* I don't think our list should ever contain NULL's, but if
         it does, let it stay and don't bother collapsing multiple
         NULL's into one.  */
      if (FILESTRCASEEQ (elt1, elt2)) {
        break;
      }
    }
    
    if (f == STR_LIST_LENGTH (*l)) {
      str_list_add (&ret, elt1); /* not found */
    } else {
      free (elt1);  /* duplicate, forget this one */
    }
  }
  
  /* Replace the passed list with what we constructed.  */
  *l = ret;
}